PatentDe  


Dokumentenidentifikation EP0404492 18.12.1997
EP-Veröffentlichungsnummer 0404492
Titel Transparente Trägermaterialien
Anmelder Xerox Corp., Rochester, N.Y., US
Erfinder Malhotra, Shadi L, Missisauga, Ontario, CA
Vertreter Grünecker, Kinkeldey, Stockmair & Schwanhäusser, Anwaltssozietät, 80538 München
DE-Aktenzeichen 69031697
Vertragsstaaten DE, FR, GB
Sprache des Dokument En
EP-Anmeldetag 19.06.1990
EP-Aktenzeichen 903066348
EP-Offenlegungsdatum 27.12.1990
EP date of grant 12.11.1997
Veröffentlichungstag im Patentblatt 18.12.1997
IPC-Hauptklasse B32B 27/02
IPC-Nebenklasse B32B 27/08   B41M 5/00   

Beschreibung[en]

This invention relates generally to transparencies, that is a transparent substrate film for receipt of a toner image, and the resulting image transparency, containing an oil-absorbing polymer with an ink-receiving layer thereon, and the use of these transparencies in dot matrix printers. Thus, in one embodiment, the present invention relates to transparent substrates for receipt of a toner image, comprised of a supporting substrate, an oil-absorbing polymer on both sides thereof, and an ink-receiving polymer thereover, which polymer is present on both exposed surfaces of the oil-absorbing layer(s).

Single-strike ribbons for dot matrix printers, comprised of a fabric such as nylon, a polyester, or silk doped with mineral or vegetable oil-based dyes, are known. Also known are multistrike ribbons which are comprised of blends of carbon black and rape seed oil, reflex blue pigment, and lecithin as a surfactant. The aforementioned inks are, for example, difficult to dry on conventional transparencies, and therefore require specially-coated polyester transparencies for overhead projectors. The aforementioned disadvantage is avoided with the transparencies of the present invention. Other advantages associated with the transparencies in many embodiments of the present invention include high optical densities of, for example, from 0.9 to 1.15, and images thereon that dry in less than 60 seconds.

Transparencies, including typewriter ribbon transparencies, are known, reference for example US-A-3,002,858; 4,379,804; 4,461,793; 4,474,850; 4,503,111; 3,790,435; 4,233,354 and 4,301,195. More specifically, there is illustrated in US-A-4,301,195 a transparent sheet material comprised of a transparent backing having an ink-receptive stratum thereon containing, for example, a mixture of two polymers, or individual layers of each polymer. One of the aforementioned selected polymers is obtained by the reaction of an epoxidized water-insoluble neutral rubbery polymer and a water-soluble secondary monoamine. In the '858 patent, there is illustrated an ink-receptive coating composition capable of receiving a typewritten image, wherein there can be selected as a coating ethyl cellulose, and a substrate such as 'Mylar' (trademark). Reference to column 1, line 12, of this patent indicates that the plastics referred to, upon which it is intended to present images, include transparent, translucent, or opaque sheets, and laminated structures. Also, in the aforementioned '354 patent, there are illustrated printed polyester films with certain properties; and containing on its surface a well-adhering printed layer formed by a printing ink with a cellulose derivative as a binder. In the '435 patent, there is described synthetic writing paper comprised of a Mylar base, and a coating thereover including polystyrene.

Other transparencies similar to those illustrated in the 4,301,195 patent are disclosed in US-A-4,474,850 and 4,503,111. Furthermore, there are disclosed in US-A-4,461,793 coatings that can be applied to a heat-shrinkable base material which is capable of forming a printing layer thereon. Specifically, in column 2, line 1, of this patent there is illustrated a printable coating useful for application to heat-shrinkable identification devices, containing a polyester film, calcium carbonate, and a silicate compound. Apparently, the heat-shrinkable base material of the '793 patent is useful as a receiver for typewritten images.

Furthermore, in US-A-4,701,367, there is described a typewriter transparency with, for example, a support substrate and thereover a coating blend selected from the group consisting of (1) poly(vinyl methyl ether), and poly(styrene); (2) poly(vinyl methyl ether), poly(styrene) and poly(ethyl acrylate); (3) a styrene-(ethylene-butylene)-styrene triblock copolymer; (4) poly(vinyl acetate), and poly(vinyl isobutylether); (5) a styrene-butadiene-styrene triblock copolymer; (6) poly(vinyl methyl ether), poly(vinyl acetate), and poly(ethylacrylate); (7) poly(hexyl methacrylate) and poly(ethyl methacrylate), and other coatings.

There is disclosed in US-A-4,446,174 an ink jet recording method for producing a recorded image on an image-receiving sheet with aqueous inks, and wherein an ink jet is projected onto an image-receiving sheet comprising a surface layer containing a pigment, which surface layer is capable of adsorbing a coloring component present in the aqueous ink. Also, there is disclosed in US-A-4,371,582 an ink jet recording sheet containing a latex polymer, which can provide images having excellent water resistance properties and high image density by jetting on to them an aqueous ink containing a water-soluble dye. Similarly, US-A-4,547,405 describes an ink jet recording sheet comprising a transparent support with a layer comprising 5 to 100 percent by weight of a coalesced block copolymer latex of poly(vinyl alcohol) with polyvinyl(benzyl ammonium chloride), and 0 to 95 percent by weight of a water-soluble polymer of poly(vinyl alcohol), poly(vinyl pyrrolidone), or copolymers thereof.

Other coatings for ink jet transparencies include blends of carboxylated polymers with poly(alkylene glycol), reference US-A-4,474,850; blends of poly(vinyl pyrrolidone) with matrix-forming polymers such as gelatin; or poly(vinyl alcohol) swellable by water and insoluble at room temperature but soluble at elevated temperatures, reference US-A- 4,503,111; and blends of poly(ethylene oxide) with carboxymethyl cellulose, as illustrated in US-A-4,592,954. In the aforementioned 4,592,954 patent, there are mentioned US-A-4,273,602; 4,370,379 and 4,234,644. Disclosed in the '602 patent are heat-sensitive record materials comprised of a support sheet of a thickness of from 5 to 40 µm containing thereon a heat-sensitive transfer layer with a phenolic material, a colorless or precolored component which reacts with the phenolic to form a color upon application of heat, and a heat-fusible material with a melting point of 40 to 150°C. It is indicated in this patent that heat-sensitive transfer layers can be formed from waxes, or resins of a low molecular weight with colored dyes dispersed therein; however, apparently there are problems associated with such a method in that part of the layer transfers to ordinary paper, causing undesirable staining and a decrease in contrast between the letters and the background. Accordingly, the recorded letters cannot be easily read, a disadvantage avoided with the transparencies of the present invention.

Also known is the preparation of transparencies by electrostatic means, reference US-A-4,370,379, wherein there is described the transferring of a toner image to a polyester film containing, for example, a substrate and a biaxially stretched poly(ethylene terephthalate) film, including 'Mylar'. Moreover, in US-A-4,234,644 there is disclosed a composite laminated film for electrophoretically toned images deposited on a plastics dielectric receptor sheet, comprising in combination an optically-transparent flexible support layer, and an optically-transparent flexible intermediate layer of a heat-softenable film applied to one side of the support; and wherein the intermediate layer possesses good adhesion to the support.

There were listed in a patentability search report the following prior art:

US-A-4,713,280, discloses a transparent sheet capable of receiving oil-based inks from impact ink transfer printers that use fabric ribbon. The ink-receptive layer may comprise polyvinyl butyral and a particulate material, such as amorphous silicon, for better ink retention; US-A-4,269,891 discloses a transparency with an ink-absorbing layer containing a number of white pigments such as silica and titanium dioxide. A binder layer of the transparency is comprised of polyvinyl alcohol; US-A-4,474,850 discloses a polyester film ('Mylar' type) coated with vinyl acetates containing pigments such as silica, zinc oxide and calcium carbonate for better ink retention; US-A-4,701,367 discussed above; and US-A-4,781,985 discloses an ink jet transparency coating comprising polyvinyl pyrrolidone/polyvinyl acetate copolymer.

Although the known transparencies are believed to be suitable for their intended purposes, there remains a need for other transparencies containing developed images that are useful for oil-based ribbons, and that will enable the formulation of images with high optical densities. Additionally, there is a need for transparencies containing developed images with an oil-absorbing polymer layer that are compatible with ink compositions, including those compositions selected for dot matrix printers, and particularly those derivable from blends of carbon black with rape seed oil, reflex blue pigment and lecithin components. There is also a need for transparencies containing developed images that enable the rapid drying of inks, and wherein, subsequent to drying, image smearing is avoided, or substantially minimized. Another need of the present invention resides in providing transparencies with coatings that do not block (stick) at, for example, 50 percent relative humidity and at a temperature of 50°C in many embodiments.

It is an object of the present invention to provide transparencies with an oil-absorbing polymer and an ink-receiving layer or layers.

These and other objects of the present invention are accomplished in one aspect by providing a transparent body for receiving or containing a toner image, comprised of a support substrate, an oil-absorbing layer present on both sides of the support substrate comprising a polymer selected from the group consisting of :

  • (a) an alkylmethacrylate copolymer selected from styrene-butylmethacrylate copolymers with a styrene content of from 25 to 75 percent by weight, an ethylmethacrylate-methylmethacrylate copolymer with a methylmethacrylate content of from 25 to 75 percent by weight, or a butylmethacrylate-isobutylmethacrylate copolymer with a butylmethacrylate content of from 25 to 75 percent by weight; (b) an ethylene-propylene block copolymer having an ethylene content of from 50 to 75 percent by weight; and (c) a sodium carboxymethyl hydroxyethyl cellulose polymer, and an ink-receiving layer present on the side of each of the two oil absorbing layers away from the support substrate.

The invention further provides a transparent body according to the appended claims.

More specifically, in accordance with one embodiment of the present invention there are provided dot matrix image transparencies which are compatible with the inks selected for marking, and wherein the transparencies enable acceptable optical density images to be obtained. Specifically, in one embodiment of the present invention there are provided transparencies including transparent substrate films for receipt of a toner image, and the resulting image transparency comprised of a support substrate, such as a polyester; an oil-absorbing polymer present on both sides of the substrate, such as hydrophobic polymers including styrene-diene star (a branched rather than a linear structure), block copolymers, styrene-butadiene triblock copolymers, styrene-(ethylene butylene)-styrene triblock copolymers, ethylene-propylene elastomers, styrene-butyl methacrylate and alkylmethacrylate copolymers, chlorinated rubber, hydrophilic sodium carboxymethyl cellulose and its derivatives, such as sodium carboxymethylhydroxyethyl cellulose; and an ink-receiving layer thereover, preferably present on both sides of the coated substrate, comprised of hydrophilic/hydrophobic segments containing copolymers such as vinyl alcohol/vinyl acetate, preferably with a vinyl alcohol content of from 5 to 25 percent by weight, vinyl alcohol/vinyl butyral, preferably with a vinyl alcohol content of from 5 to 30 percent by weight, and vinyl alcohol/vinyl acetate/vinyl chloride, preferably with a vinyl alcohol content of from 5 to 25 percent by weight, vinyl acetate content of from 3 to 10 percent by weight, and a vinyl chloride content of from 92 to 65 percent by weight. The ink-receiving layer can also contain therein or thereon filler components such as colloidal silicas, calcium carbonate and titanium dioxide.

One specific embodiment of the present invention is directed to image transparencies for dot matrix printers, which transparencies are comprised of a support substrate such as a polyester, an oil-absorbing polymer layer of styrene-(ethylene butylene)-styrene triblock copolymer with a styrene content of 29 percent by weight in a thickness of 2 to 10 µm and an ink-receiving layer thereover of a hydrophilic/hydrophobic segment (for example in a vinyl alcohol/vinyl acetate copolymer the vinyl alcohol is hydrophilic, the vinyl acetate is hydrophobic, in vinyl alcohol/vinyl butyral copolymer vinyl alcohol is hydrophilic/vinyl butyral is hydrophobic) containing a copolymer of vinyl alcohol/vinyl acetate in a thickness of from 1 to 5 µm. The porous (permeable)transparencies of the present invention yield higher optical density images, for example, black from 0.95 to 1.0, than those obtained on nonporous single layer structure transparencies produced by coatings of styrene-(ethylene butylene)-styrene triblock copolymers alone (black from 0.65 to 0.70) of US-A-4,701,367 or hydrophobic ethyl cellulose coatings (black of 0.58) of US-A-3,002,858. In the two-layered image transparencies of the present invention, the ink components of ribbons used in dot matrix printers, such as carbon black, rape seed oil, lecithin and reflex blue pigment, evidence a chromatographic separation where carbon black is embedded in the top ink-receiving layer, and the rape seed oil and reflex blue pigment migrate to the oil-absorbing layer. The net effect of this phenomenon is a more efficient and effective spread of the colorants on the coating structure, thereby providing higher optical density images of from 0.9 to 1.15. The images on styrene-(ethylene butylene)-styrene triblock copolymers alone or on ethyl cellulose coatings do not, it is believed, spread properly and hence yield low optical density images.

The presence of chromatographic separation of colorants on the two layered-structure imaged transparencies of the present invention can be demonstrated with 'Scotch tape' (trademark). The two-layered transparencies of the present invention were printed with square test patterns using a Roland PR-1012 dot matrix printer. The optical densities of the resulting images ranged between 0.90 and 1.15. These images were tested for their fix using 'Scotch tape' to lift off the images. The optical densities of the remaining image were measured and found to be between 0.60 to 0.65, and the images were blue in color, it is believed, because of the presence of reflex blue pigment. A similar test was performed on transparencies coated with styrene-(ethylene butylene)-styrene triblock copolymer alone and imaged with square test patterns using the same printer. The optical densities of these images were 0.65 to 0.70. These images were lifted off with 'Scotch tape'. The optical densities of the remaining images were between 0.50 to 0.55, and the images had a faint black color. Replacing the transparency coating of styrene-(ethylene butylene)-styrene triblock copolymer with ethyl cellulose yielded images which had optical densities of 0.58 to 6.0 prior to lift off, and 0.45 after the 'Scotch tape' test; the color of the remaining images was faint black.

Specific examples of substrates or base layers with a thickness of from 50 to 125 µm, and preferably of a thickness of from 75 to 100 µm that may be selected for the image transparencies of the present invention include cellulose acetate, poly(sulfone), poly(propylene), poly(vinylchloride) or poly(terephthalate). More specifically, suitable substrates include 'Mylar', commercially available from E.I. DuPont; 'Melinex', commercially available from Imperial Chemical, Inc.; 'Celanar', commercially available from Celanese; polycarbonates, especially 'Lexan'; polysulfones; cellulose triacetate; polyvinylchlorides; with 'Mylar' being particularly preferred in view of its availability and lower costs.

Specific examples of oil-absorbing layers of an effective thickness, for example, of from 2 to 10 µm and in contact with the support substrate are (1) halogenated rubber; (2) styrene-diene copolymers; (3) alkyl methacrylate copolymers; (4) ethylene-propylene copolymers; (5) sodium carboxymethyl cellulose; or (6) sodium carboxymethylhydroxyethyl cellulose.

Preferably, the halogenated rubber is chlorinated rubber with an amount of chlorination of from 25 to 75 percent by weight, and more preferably 65% chlorinated rubber (Scientific Polymer Products).

Preferably, the styrene-diene copolymers are styrene-butadiene-styrene triblock copolymers, styrene-(ethylene butylene)-styrene triblock copolymer, or styrene-butadiene star triblock copolymers, with a styrene content of from 25 to 75 percent by weight. More specifically, suitable styrene-diene copolymers include styrene-(ethylene butylene)-styrene triblock copolymers with a styrene content of 29 percent by weight (available as Kraton G from Shell Chemical Company), styrene-butadiene star block (available as Cariflex from Shell Chemical Company), styrene-butadiene triblock copolymer with a styrene content of 38 percent by weight (available from Shell Chemical Company).

Preferably, the alkylmethacrylate copolymer is selected from styrene-butylmethacrylate copolymers with a styrene content of from 25 to 75 percent by weight, an ethylmethacrylate-methylmethacrylate copolymer with a methylmethacrylate content of from 25 to 75 percent by weight, or a butylmethacrylate-isobutylmethacrylate copolymer with a butylmethacrylate content of from 25 to 75 percent by weight. More specifically, suitable alkylmethacrylate copolymers are styrene-butylmethacrylate copolymers with a styrene content of 50 percent by weight (Scientific Polymer Products), and alkylmethacrylate copolymers (Acryloid B-72, B-82 available from Rohm and Hass).

Preferably, the ethylene-propylene copolymer is an ethylene-propylene (TPR Uniroyal Company) block copolymer having an ethylene content of from 50 to 75 percent by weight.

The sodium carboxymethyl cellulose is suitably CMC7LF (available from Hercules Chemical Company), and the sodium carboxymethylhydroxyethyl cellulose is suitably CMHEC 43H, 37L (available from Hercules Chemical Company). CMHEC 43H is believed to be a high molecular weight polymer with a carboxymethyl cellulose (CMC)/hydroxyethyl cellulose (HEC) ratio of 4/3; CMHEC 37L is a low molecular weight polymer with a CMC/HEC ratio of 3/7. Preferred oil-absorbing polymers include chlorinated rubber as well as styrene-diene copolymer, since these are readily available and possess excellent properties for oil absorption.

Illustrative examples of ink-receiving layers of, for example, a thickness of from 1 to 5 µm and in contact with the oil-absorbing layer include copolymers of vinyl alcohol/vinyl acetate, preferably with a vinyl alcohol content of 18 percent by weight (available from Scientific Polymer Products), vinyl alcohol/vinyl butyral, preferably with a vinyl alcohol content of 19.5 percent by weight (Scientific Polymer Products), vinyl alcohol/vinyl acetate/vinyl chloride, preferably with a vinyl alcohol content of 15 percent by weight, vinyl acetate content of 5 percent by weight and vinyl chloride content of 80 percent by weight (Scientific Polymer Products), with the preferred layer being comprised of the copolymer of vinyl alcohol/vinyl acetate primarily because of its high performance, that is images with optical density of 1.0 can be obtained.

The ink-receiving layer may contain filler components as indicated herein in various effective amounts such as, for example, from 2 to 25 weight percent. Examples of fillers include colloidal silicas present, for example, in one embodiment in an amount of 5 weight percent (available as Syloid 74 from W.R. Grace Company), calcium carbonate and titanium dioxide (rutile).

The two-layered structure polymer coatings can be present on the supporting substrates, such as 'Mylar', or paper in various thicknesses depending on the coatings selected and the other components utilized; however, generally the total thickness of the polymer coatings is from 3 to 15 µm, and preferably from 7 to 10 µm. Moreover, these coatings can be applied by a number of known techniques, including reverse roll, extrusion and dip coating processes. In dip coating, a web of material to be coated is transported below the surface of the coating material by a single roll in such a manner that the exposed site is saturated, followed by the removal of any excess by a blade, bar or squeeze rolls. With reverse roll coating, the premetered material is transferred from a steel applicator roll to the web material moving in the opposite direction on a backing roll. Metering is performed in the gap between precision ground chilled iron rolls. The metering roll is stationary or is rotated slowly in the direction opposite to the applicator roll. In slot extrusion coating there is selected a flat die to apply coating material, with the die lips in close proximity to the web of material to be coated. Once the desired amount of coating has been applied to the web, the coating is dried at 70 to 100°C in an air dryer.

In one specific process embodiment, the image transparencies of the present invention are prepared by providing a 'Mylar' substrate in a thickness of from 75 to 100 µm, and applying to each side of the 'Mylar' by dip coating, in a thickness of from 2 to 10 µm, an oil-absorbing layer polymer such as a styrene-(ethylene butylene)-styrene triblock copolymer with styrene content of 29 percent by weight. Thereafter, the coating is air dried at 25°C for 60 minutes and the resulting transparency is subsequently dip coated on both sides with an ink-receiving layer comprised, for example, of a copolymer of vinyl alcohol/vinyl acetate in a thickness of from 1 to 5 µm. Coating is effected from a mixture of toluene or other similar solvent, 70 percent by weight, and 1-butanol or other alcohol, 30 percent by weight, which mixture was present in a concentration of 3 percent by weight. Thereafter, the coating is air dried and the resulting layered structure transparency can be utilized in a dot matrix printer, enabling transparencies with images thereon.

The optical density measurements recited herein, including the working examples, were obtained on a Pacific Spectrograph Color System. The system consists of two major components: an optical sensor and a data terminal. The optical sensor employs a 150 mm integrating sphere to provide diffuse illumination and 8 degrees viewing. This sensor can be used to measure both transmission and reflectance samples. When reflectance samples are measured, a specular component may be included. A high resolution, full dispersion, grating monochromator was used to scan the spectrum from 380 to 720 nanometers. The data terminal features a 300 mm CRT display, numerical keyboard for selection of operating parameters, and the entry of tristimulus values; and an alphanumeric keyboard for entry of product standard information.

The following examples are being supplied to define specific embodiments of the present invention further, it being noted that these examples are intended to illustrate and not limit the scope of the present invention. Parts and percentages are by weight unless otherwise indicated.

EXAMPLE I

There were prepared 10 coated transparenct 'Mylar' sheets of a thickness of 100 µm by dip coating these sheets, both (two) sides for each sheet, into a coating solution containing a chlorinated (65 weight percent) rubber, which solution was present in a concentration of 4 percent by weight in toluene. Subsequent to air drying for 60 minutes at 25°C in a fume hood equipped with an adjustable volume exhaust system, and monitoring the difference in weight prior to and subsequent to coating, the coated sheets had present on each side 400 milligrams, 5 µm in thickness, of the chlorinated rubber polymer. These sheets were then coated on both sides with an ink-receiving layer by dip coating the sheets into a solution of vinyl alcohol/vinyl acetate copolymer with a vinyl alcohol content of 18 percent by weight, which solution was present in a concentration of 3 percent by weight of a mixture of toluene (70 percent by weight) and 1-butanol (30 percent by weight). Subsequent to air drying for 60 minutes at 25°C, and monitoring the difference in weight prior to and subsequent to coating, the coated sheets had present on each side 300 milligrams, 3 µm in thickness, of the ink-receiving layer of a copolymer vinyl alcohol/vinyl acetate in contact with chlorinated rubber. These sheets were then fed into a Roland PR-1012 dot matrix printer having incorporated therein a black cloth ribbon doped with an ink believed to be comprised of carbon black, the surfactant lecithin, reflex blue pigment and rape seed oil, and there were obtained transparency sheets with images with an average optical density (that is the sum of the optical densities of the 10 sheets divided by 10) of 1.0.

EXAMPLE II

There were prepared 10 coated transparenct 'Mylar' sheets of a thickness of 100 µm by dip coating both (two) sides of these sheets (10) into a coating solution of styrene-(ethylene butylene)-styrene triblock copolymer with styrene content of 29 percent by weight which solution was present in a concentration of 4 percent by weight in toluene. Subsequent to air drying for 60 minutes at 25°C in a fume hood equipped with adjustable volume exhaust system and monitoring the difference in weight prior to and subsequent to coating, these dried coated sheets had present on each side 400 milligram, 4 µm in thickness, of the triblock polymer oil-absorbing layer. The sheets were further coated on both sides of the aforementioned oil-absorbing triblock layers with a copolymer of vinyl alcohol/vinyl butyral with a vinyl alcohol content of 19.5 percent by weight, which solution was present in a concentration of 3 percent by weight of a mixture of toluene (60 percent by weight) and 1-butanol (40 percent by weight). Subsequent to air drying for 60 minutes at 25°C in a fume hood equipped with adjustable volume exhaust system, and monitoring the difference in weight prior to and subsequent to coating, these dried coated sheets had present on each side 300 milligram, 3.5 µm in thickness, of the vinyl alcohol/vinyl butyral copolymer in contact with styrene-(ethylene butylene)-styrene copolymer. These sheets were then fed into a dot matrix printer and there were obtained transparency sheets containing images thereon with an average optical density of 0.95.

EXAMPLE III

There were prepared, by repeating the procedure of Example II, 10 coated opaque plastics 'Mylar' sheets of a thickness of 100 µm by dip coating these sheets into a coating solution of sodium carboxymethylhydroxyethyl cellulose polymer (CMHEC 37L), which solution was present in a concentration of 4 percent by weight in water. Subsequent to air drying for 60 minutes at 25°C in a fume hood equipped with adjustable volume exhaust system and monitoring the difference in weight prior to and subsequent to coating, these dried coated sheets had present on each side 400 milligrams, 5 µm in thickness, of the polymer. These sheets were then coated with an ink-receiving layer of a blend of vinyl alcohol/vinyl acetate/vinyl chloride terpolymer (with vinyl alcohol content of 15 percent by weight, vinyl acetate content of 5 percent by weight, vinyl chloride content of 80 percent by weight), 75 percent by weight, colloidal silica filler 10 percent by weight, titanium dioxide filler 15 percent by weight, which blend was present in a concentration of 5 percent by weight in acetone. Subsequent to air drying for 60 minutes at 25°C in a fume hood equipped with adjustable volume exhaust system and monitoring the difference in weight prior to and subsequent to coating, these dried coated sheets had present on each side 250 milligrams, 3 µm in thickness, of the terpolymer vinyl alcohol/vinyl acetate/vinyl chloride in contact with the oil-absorbing layer sodiumcarboxymethylhydroxyethyl cellulose. These sheets were then fed into a dot matrix printer and there were obtained sheets with images thereon with an average optical density of 1.15.


Anspruch[de]
  1. Transparenter Körper zur Aufnahme oder enthaltend ein Tonerbild, der sich aus einem Trägersubstrat, einer Öl absorbierenden Schicht, die auf beiden Seiten des Trägersubstrats vorhanden ist, umfassend: ein Polymer, das aus der Gruppe, die aus
    • (a) einem Alkylmethacrylatcopolymer, das aus Styrol-Butylmethacrylat-Copolymeren mit einem Styrolgehalt von 25 bis 75 Gew.-%, einem Ethylmethacrylat-Methylmethacrylat-Copolymer mit einem Methylmethacrylatgehalt von 25 bis 75 Gew.-% oder einem Butylmethacrylat-Isobutylmethacrylat-Copolymer mit einem Butylmethacrylatgehalt von 25 bis etwa 75 Gew.-% ausgewählt ist,
    • (b) einem Ethylen-Propylen-Blockcopolymer mit einem Ethylengehalt von 50 bis 75 Gew.-% und
    • (c) einem Natriumcarboxymethylhydroxyethylcellulosepolymer besteht, ausgewählt ist,

      und einer Tinte aufnehmenden Schicht auf der Seite jeder der zwei Öl absorbierenden Schichten, die entfernt vom Trägersubstrat ist, zusammensetzt.
  2. Transparenter Körper nach Anspruch 1, wobei die Tinte aufnehmende Schicht ein Vinylalkohol/Vinylacetat-Copolymer mit einem Vinylalkoholgehalt von 5 bis 25 Gew.-%, ein Vinylalkohol/Vinylbutyral mit einem Vinylalkoholgehalt von 5 bis 30 Gew.-% oder ein Vinylalkohol/Vinylacetat/Vinylchlorid-Terpolymer mit einem Vinylalkoholgehalt von 5 bis 25 Gew.-%, einem Vinylacetatgehalt von 3 bis 10 Gew.-% und einem Vinylchloridgehalt von 92 bis 65 Gew.-% umfaßt.
  3. Transparenter Körper zur Aufnahme oder enthaltend ein Tonerbild, der sich aus einem Trägersubstrat, einer Öl absorbierenden Polymerschicht, die auf beiden Oberflächen des Substrats vorhanden ist und sich aus (1) einem halogenierten Kautschuk, (2) Styrol-Dien-Copolymeren, (3) Alkylmethacrylatcopolvmeren, (4) Ethylen-Propylen-Copolymeren, (5) Natriumcarboxymethylcellulose oder (6) Natriumcarboxymethylhydroxyethylcellulose zusammensetzt, und einer Tinte aufnehmenden Schicht in Kontakt mit jeder exponierten Oberfläche der Öl absorbierenden Schicht zusammensetzt, wobei die Tinte aufnehmende Schicht ein Vinylalkohol/Vinylacetat-Copolymer mit einem Vinylalkoholgehalt von 5 bis 25 Gew.-%, ein Vinylalkohol/Vinylbutyral mit einem Vinylalkoholgehalt von 5 bis 30 Gew.-% oder ein Vinylalkohol/Vinylacetat/Vinylchlorid-Terpolymer mit einem Vinylalkoholgehalt von 5 bis 25 Gew.-%, einem Vinylacetatgehalt von 3 bis 10 Gew.-% und einem Vinylchloridgehalt von 92 bis 65 Gew.-% umfaßt.
  4. Transparenter Körper nach Anspruch 3, wobei der halogenierte Kautschuk ein chlorierter Kautschuk mit einem Chlorierungsgehalt von 25 bis 75 Gew.-% ist.
  5. Transparenter Körper nach Anspruch 3, wobei die Styrol-Dien-Copolymere Styrol-Butadien-Styrol-Dreiblockcopolymere, Styrol-(Ethylenbutylen)-Styrol-Dreiblockcopolymere oder Styrol-Butadien-Stern-Dreiblockcopolymere mit einem Styrolgehalt von 25 bis 75 Gew.-% sind.
  6. Transparenter Körper nach einem der vorhergehenden Ansprüche, wobei das Substrat eine Dicke von 50 bis 125 µm aufweist, die Öl absorbierende Schicht eine Dicke von 2 bis 10 µm aufweist und die Tinte aufnehmende Schicht eine Dicke von 1 bis 5 µm aufweist.
  7. Transparenter Körper nach einem der vorhergehenden Ansprüche, wobei die Tinte aufnehmende Schicht Füllstoffe enthält.
  8. Transparenter Körper nach Anspruch 7, wobei die Füllstoffe in einer Menge von 2 bis 25 Gew.-% der Tinte aufnehmenden Schicht vorhanden sind.
  9. Transparenter Körper nach einem der vorhergehenden Ansprüche, wobei das Trägersubstrat aus Celluloseacetat, Poly(sulfon), Poly(propylen), Poly(vinylchlorid) oder Poly(ethylenterephthalat) hergestellt ist.
Anspruch[en]
  1. A transparent body for receiving or containing a toner image, comprised of a support substrate, an oil-absorbing layer present on both sides of the support substrate comprising a polymer selected from the group consisting of
    • (a) an alkylmethacryate copolymer selected from styrene-butylmethacrylate copolymers with a styrene content of from 25 to 75 percent by weight, an ethylmethacrylate-methylmethacrylate copolymer with a methylmethacrylate content of from 25 to 75 percent by weight, or a butylmethacrylate-isobutylmethacrylate copolymer with a butylmethacrylate content of from 25 to 75 percent by weight;
    • (b) an ethylene-propylene block copolymer having an ethylene content of from 50 to 75 percent by weight; and
    • (c) a sodium carboxymethyl hydroxyethyl cellulose polymer, and an ink-receiving layer present on the side of each of the two oil absorbing layers away from the support substrate.
  2. A transparent body in accordance with claim 1 wherein the ink-receiving layer comprises a vinyl alcohol/vinyl acetate copolymer with a vinyl alcohol content of from 5 to 25 percent by weight; a vinyl alcohol/vinyl butyral with a vinyl alcohol content of from 5 to 30 percent by weight; or a vinyl alcohol/vinyl acetate/vinyl chloride terpolymer, with a vinyl alcohol content of from 5 to 25 percent by weight, a vinyl acetate content of from 3 to 10 percent by weight, and a vinyl chloride content from 92 to 65 percent by weight.
  3. A transparent body for receiving or containing a toner image comprised of a support substrate, an oil-absorbing polymer layer present on both surfaces of the substrate and comprised of (1) halogenated rubber; (2) styrene-diene copolymers; (3) alkyl methacrylate copolymers; (4) ethylene-propylene copolymers; (5) sodium carboxymethyl cellulose; or (6) sodium carboxymethylhydroxyethyl cellulose; and an ink-receiving layer in contact with each exposed surface of the oil-absorbing layer; wherein the ink-receiving layer comprises a vinyl alcohol/vinyl acetate copolymer with a vinyl alcohol content of from 5 to 25 percent by weight; a vinyl alcohol/vinyl butyral with a vinyl alcohol content of from 5 to 30 percent by weight; or a vinyl alcohol/vinyl acetate/vinyl chloride terpolymer, with a vinyl alcohol content of from 5 to 25 percent by weight, a vinyl acetate content of from 3 to 10 percent by weight, and a vinyl chloride content from 92 to 65 percent by weight.
  4. A transparent body in accordance with claim 3, wherein the halogenated rubber is chlorinated rubber with an amount of chlorination from 25 to 75 percent by weight.
  5. A transparent body in accordance with claim 3, wherein the styrene-diene copolymers are styrene-butadiene-styrene triblock copolymers, styrene-(ethylene butylene)-styrene triblock copolymer, or styrene-butadiene star triblock copolymers, with a styrene content of from 25 to 75 percent by weight.
  6. A transparent body in accordance with any preceding claim, wherein the substrate has a thickness of from 50 to 125 µm, the oil-absorbing layer has a thickness of from 2 to 10 µm, and the ink-receiving layer has a thickness of from 1 to 5 µm.
  7. A transparent body in accordance with any preceding claim, wherein the ink-receiving layer contains fillers.
  8. A transparent body in accordance with claim 7, wherein the fillers are present in an amount of from 2 to 25 percent by weight of the ink receiving layer.
  9. A transparent body in accordance with any preceding claim, wherein the support substrate is of cellulose acetate, poly(sulfone), poly(propylene), poly(vinyl chloride) or poly(ethylene terephthalate).
Anspruch[fr]
  1. Elément transparent destiné à recevoir ou à contenir une image de toner, composé d'un substrat support, d'une couche absorbant l'huile présente sur les deux côtés du substrat du support comprenant un polymère choisi dans le groupe constitué par :
    • (a) un copolymère de méthacrylate d'alkyle choisi parmi des copolymères styrène-méthacrylate de butyle présentant une teneur en styrène de 25 à 75 pour cent en poids, un copolymère méthacrylate d'éthyle-méthacrylate de méthyle présentant une teneur en méthacrylate de méthyle de 25 à 75 pour cent en poids, ou un copolymère méthacrylate de butyle-méthacrylate d'isobutyle présentant une teneur en méthacrylate de butyle de 25 à environ 75 pour cent en poids;
    • (b) un copolymère séquencé éthylène-propylène présentant une teneur en éthylène de 50 à 75 pour cent en poids; et
    • (c) un polymère de carboxyméthylhydroxy-éthylcellulose sodique, et une couche receveuse d'encre présente du côté opposé au substrat support de chacune des deux couches absorbant l'huile.
  2. Elément transparent selon la revendication 1, dans lequel la couche receveuse d'encre comprend un copolymère alcool vinylique/acétate de vinyle présentant une teneur en alcool vinylique de 5 à 25 pour cent en poids; un copolymère alcool vinylique/butyral de vinyle, présentant une teneur en alcool vinylique de 5 à 30 pour cent en poids; ou un terpolymère alcool vinylique/acétate de vinyle/chlorure de vinyle présentant une teneur en alcool vinylique de 5 à 25 pour cent en poids, une teneur en acétate de vinyle de 3 à 10 pour cent en poids et une teneur en chlorure de vinyle de 92 à 65 pour cent en poids.
  3. Elément transparent destiné à recevoir ou à contenir une image de toner composé d'un substrat support, d'une couche de polymère absorbant l'huile présente sur les deux surfaces du substrat et composée (1) d'un caoutchouc halogéné; (2) de copolymères styrène-diène; (3) de copolymères de méthacrylate d'alkyle; (4) de copolymères éthylène-propylène; (5) de carboxyméthylcellulose sodique; ou (6) de carboxyméthylhydroxyéthylcellulose sodique; et d'une couche receveuse d'encre en contact avec chaque surface extérieure de la couche absorbant l'huile; dans lequel la couche receveuse d'encre comprend un copolymère alcool vinylique/acétate de vinyle présentant une teneur en alcool vinylique de 5 à 25 pour cent en poids; un copolymère alcool vinylique/butyral de vinyle, présentant une teneur en alcool vinylique de 5 à 30 pour cent en poids; ou un terpolymère alcool vinylique/acétate de vinyle/chlorure de vinyle présentant une teneur en alcool vinylique de 5 à 25 pour cent en poids, une teneur en acétate de vinyle de 3 à 10 pour cent en poids et une teneur en chlorure de vinyle de 92 à 65 pour cent en poids.
  4. Elément transparent selon la revendication 3, dans lequel le caoutchouc halogéné est un caoutchouc chloré présentant un taux de chloration de 25 à 75 pour cent en poids.
  5. Elément transparent selon la revendication 3, dans lequel les copolymères styrène-diène sont des copolymères triséquencés styrène-butadiène-styrène, un copolymère triséquencé styrène-(éthylène butylène)-styrène, ou des copolymères triséquencés en étoile styrène-butadiène, présentant une teneur en styrène de 25 à 75 pour cent en poids.
  6. Elément transparent selon l'une quelconque des revendications précédentes, dans lequel le substrat présente une épaisseur de 50 à 125 µm, la couche absorbant l'huile présente une épaisseur de 2 à 10 µm, et la couche receveuse d'encre présente une épaisseur de 1 à 5 mm.
  7. Elément transparent selon l'une quelconque des revendications précédentes, dans lequel la couche receveuse d'encre contient des charges.
  8. Elément transparent selon la revendication 7, dans lequel les charges sont présentes en une quantité de 2 à 25 pour cent en poids de la couche receveuse d'encre.
  9. Elément transparent selon l'une quelconque des revendications précédentes, dans lequel le substrat support est fait d'acétate de cellulose, de poly(sulfone), de poly(propylène), de poly(chlorure de vinyle) ou de poly(téréphtalate d'éthylène).






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
D Textilien; Papier
E Bauwesen; Erdbohren; Bergbau
F Maschinenbau; Beleuchtung; Heizung; Waffen; Sprengen
G Physik
H Elektrotechnik

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