JPH0564977A - Image receiving sheet - Google Patents

Abstract

PURPOSE:To provide an image receiving sheet best suited for antistatic and slipping properties which is best suited for thermal transfer or duplication. CONSTITUTION:At least, one surface of a base sheet has an image formation area, and the rear surface has a slipping layer. The slipping layer is coated with the polymer of an ester (meth)acrylate monomer having the quaternary ammonium group.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image receiving sheet, and more specifically, it is an object of the present invention to provide an image receiving sheet which is excellent in antistatic property, slipperiness and the like and suitable for thermal transfer or copying.

[0002]

2. Description of the Related Art Conventionally, various thermal transfer methods are known. Among them, a sublimable dye is used as a recording agent, and a sublimable dye is used as a thermal transfer sheet by supporting it on a base material sheet such as polyester film. Transferable material that can be dyed, for example,
There has been proposed a method of forming various full-color images on an image receiving sheet having a dye receiving layer formed on paper, a plastic film or the like. In this case, the thermal head of the printer is used as the heating means, and a large number of three-color or four-color dots are transferred to the image-receiving sheet by heating for an extremely short time, and the full-color image of the original is formed by the multi-color dots. It is to be reproduced. The image formed in this way is extremely clear because the coloring material used is a dye and has excellent transparency, so the resulting image has excellent reproducibility of intermediate colors and gradation, and It is possible to form a high quality image which is similar to the image obtained by the offset printing or gravure printing and which is comparable to the full color photographic image.

[0003]

In order to effectively carry out the above-mentioned thermal transfer method, not only the structure of the thermal transfer sheet but also the structure of the image receiving sheet for forming an image are important. That is, since the thermal transfer sheet and the image receiving sheet are both conveyed in the printer and rub against each other during image formation, the image receiving sheet is generally charged and the sheets are electrostatically adhered to each other, and two or more sheets are overlapped during paper feeding. The problem of so-called double feeding occurs. This double feeding problem is especially OH
This tends to occur in the case of a transparent plastic sheet for P image formation. Such a problem similarly occurs when the image receiving sheet is used for copying. Further, there is a problem that dust or the like adheres to the image forming surface of the image receiving sheet due to charging due to friction, and a color loss or chipping occurs in the formed image. Such problems are generally solved by providing a slipping layer made of acrylic resin or the like on the back surface of the image-receiving sheet, or by subjecting the front surface or the back surface to antistatic treatment. , The slipperiness and antistatic performance are insufficient, and if a large amount of lubricant is used to obtain slipperiness, OHP
When used, the transparency is lost. Further, in the case of the antistatic treatment, there is a problem that the antistatic agent attached to the surface is easily lost with time. Particularly when a full-color image is formed by a thermal transfer method or a copying method, the dye or toner is transferred three to four times to the image forming surface of the same area.
A general antistatic treatment of applying an antistatic agent to the image-receiving sheet does not maintain sufficient antistatic properties, and therefore does not form a high-quality full-color image with no double feed problem and color loss. It was Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide an image-receiving sheet excellent in antistatic property, slipperiness, etc., suitable for thermal transfer or copying.

[0004]

The above object can be achieved by the present invention described below. That is, the present invention has an image forming surface on at least one surface of a base sheet, and a slip layer is provided on the back surface, and the slip layer is composed of a (meth) acrylic acid ester monomer having a quaternary ammonium group. The image-receiving sheet is a coating layer made of a polymer.

[0005]

By forming a layer made of a specific cationic resin on the back surface of the image-receiving sheet and incorporating a lubricant, etc., if necessary, for heat transfer or copying excellent in antistatic properties and slip properties. A suitable image receiving sheet is provided.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the following preferred embodiments. The image-receiving sheet of the present invention comprises a substrate sheet and a slip layer provided on the back surface of the image-receiving surface thereof. Examples of the base sheet used in the present invention include synthetic paper (polyolefin-based, polystyrene-based, etc.), high-quality paper, art paper, coated paper, cast-coated paper, wallpaper, backing paper, synthetic resin or emulsion-impregnated paper, synthetic rubber latex. Films or sheets of various plastics such as impregnated paper, synthetic resin internal paper, paperboard, cellulose fiber paper, polyolefin, polyvinyl chloride, polyethylene terephthalate, polystyrene, polymethacrylate, polycarbonate, etc. can be used, and their synthesis is also possible. A white opaque film formed by adding a white pigment or a filler to a resin, a foamed foamed sheet, or the like can be used and is not particularly limited.
Further, a laminated body made of any combination of the above-mentioned substrate sheets can also be used. As an example of a typical laminated body, a synthetic paper of cellulose fiber paper and synthetic paper or cellulose fiber paper and plastic film or sheet can be mentioned. The thickness of these base material sheets may be arbitrary, for example, 10 to 300 μm.
A thickness of about m is common. When forming an image for observing transmitted light on the image receiving sheet of the present invention, that is, OHP
When it is used as an image receiving sheet for use in the above, the above-mentioned base material sheet should be transparent. The substrate sheet as described above, when it is necessary to form an image receiving layer on the surface thereof, for example, in the case of a sublimation type thermal transfer image receiving sheet, it is necessary to form a dye receiving layer, and adhesion with the dye receiving layer. When the strength is low, it is preferable to subject the surface to primer treatment or corona discharge treatment.

When the image-receiving sheet of the present invention is a sublimation type thermal transfer image-receiving sheet, a dye-receiving layer is formed on the surface of the base sheet. Such a dye receiving layer is for receiving the sublimable dye transferred from the thermal transfer sheet and maintaining the formed image. As the resin for forming the dye receiving layer, for example, polyolefin resin such as polypropylene, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, halogenated polymer such as polyvinylidene chloride,
Polyvinyl acetate, vinyl polymers such as polyacrylic ester, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polystyrene resins, polyamide resins, copolymer resins of olefins such as ethylene and propylene and other vinyl monomers, Examples thereof include ionomers, cellulosic resins such as cellulose diacetate, polycarbonates, and the like, and particularly preferable are vinyl resins and polyester resins. In forming the dye receiving layer, pigments or fillers such as titanium oxide, zinc oxide, kaolin clay, calcium carbonate and finely powdered silica are used for the purpose of improving the whiteness of the dye receiving layer and further enhancing the sharpness of the transferred image. Agents can be added.
The dye receiving layer is a resin obtained by adding the necessary additives to the resin, dissolved in an appropriate organic solvent or dispersed in an organic solvent or water, for example, a gravure printing method, a screen printing method, A dye receiving layer is formed by coating and drying by a forming means such as a reverse roll coating method using a gravure plate. The dye-receptive layer formed as described above may have any thickness, but generally has a thickness of 1 to 50 μm. Further, such a dye receiving layer is preferably a continuous coating, but it may be formed as a discontinuous coating by using a resin emulsion or resin dispersion.

The thermal transfer image-receiving sheet of the present invention can be basically used satisfactorily with the above-mentioned constitution, but the dye-receiving layer of the present invention is provided with good releasability from the thermal transfer sheet. A release agent can also be included.
When the image-receiving sheet of the present invention is a heat-melt type thermal transfer image-receiving sheet or an image-receiving sheet for copying, it may or may not be provided with an receiving layer for receiving ink or toner. .. In the present invention, the slip layer formed on the back surface of the base sheet is formed mainly of a polymer of a (meth) acrylic acid ester monomer having a tertiary amino group or a quaternary ammonium group. The above-mentioned cationic acrylic monomer constituting this polymer is, for example, dimethylaminoethyl (meth) acrylate, diethylamino (meth) acrylate, diethanolamino (meth) acrylate, dipropylamino (meth) acrylate,
Examples thereof include (meth) acrylic acid ester monomers having a tertiary amino group such as dipropanolamino (meth) acrylate and dibutylamino (meth) acrylate, and quaternized products thereof.

In a preferred embodiment of the present invention, the above-mentioned polymer is preferably a copolymer with a diene compound and a polyfunctional crosslinking agent. Examples of diene compounds include:
Known diene compounds such as 1,3-butadiene, isoprene and chloroprene can be mentioned. Examples of polyfunctional monomers include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, p-divinylbenzene, trimethylolpropane tri (meth) acrylate, 1,6-hexanediol di (meth). Examples thereof include acrylate, neopentyl glycol di (meth) acrylate, dipentaerythritol hexa (meth) acrylate and the like. The preferred copolymer in the present invention is obtained by copolymerizing the above three components, and then the third component
It is obtained by quaternizing a primary amino group. The monomer containing a tertiary amino group may be quaternized before the polymerization. Such a copolymer can be obtained from the market itself and used effectively in the present invention. By copolymerizing the above-mentioned diene compound, the coating film forming ability of the coating film formed is improved, and the polyfunctional monomer is effective in improving heat resistance and coating film strength. The preferable ratio of the monomer in the copolymer is 10 to 100 mol% of the diene compound and 1 to 20 mol% of the polyfunctional monomer with respect to 100 mol% of the tertiary amino group-containing (meth) acrylic acid ester monomer. The range is. If the amount of the diene compound is too low, the coating film forming ability cannot be satisfied, and if the amount is too large,
The antistatic performance of the slip layer formed is unsatisfactory.
On the other hand, when the amount of the polyfunctional monomer is too small, the heat resistance and strength of the coating film formed are insufficient, while when it is too large, the solubility in a solvent is lowered and it becomes difficult to prepare a coating liquid.

The above-mentioned slip layer is prepared by dissolving the above-mentioned copolymer containing the necessary additives in a suitable organic solvent or dispersing it in an organic solvent or water, for example, a gravure printing method, It is formed by coating and drying by a forming means such as a screen printing method or a reverse roll coating method using a gravure plate. It is preferable to use a lubricant that improves lubricity as an additive, and examples of such a lubricant include waxes such as polyethylene wax and paraffin wax, higher fatty acid amides, higher fatty acid esters, higher fatty acid salts, higher alcohols, and lecithin. Fluorine ester, silicone oil, silicone wax, silicone resin, powder of fluororesin such as polytetrafluoroethylene, powder of vinyl fluoride resin, powder of guanamine resin, boron nitride, silica, wood powder, talc, etc. Be done. Particularly preferred lubricants are silicone lubricants and fluororesin powders. The amount of these lubricants added is in the range of 0.05 to 100 parts by weight per 100 parts by weight of the resin in the slip layer, but when the image-receiving sheet of the present invention is required to have high transparency such as for OHP. In addition, the addition amount of the lubricant should be suppressed to a level that does not impair the transparency, for example, 0.05 to 5 parts by weight. The slip layer formed as described above may have any thickness, but is generally 1 to 50 μm,
The thickness is preferably 10 to 30 μm. If the slip layer does not have sufficient adhesion to the base sheet, it is preferable to subject the surface of the base sheet to primer treatment or corona discharge treatment. A suitable primer resin for the slip layer is a polyester resin.

Further, when the image receiving sheet is a thermal transfer image receiving sheet, it is possible to provide a detection mark on the image receiving sheet. The detection mark is extremely convenient when positioning the thermal transfer sheet and the image receiving sheet. For example, the detection mark that can be detected by the photoelectric tube detection device can be provided on the back surface of the image receiving sheet by printing or the like. The sublimation type thermal transfer sheet used when performing thermal transfer using the image-receiving sheet of the present invention as described above is one in which a dye layer containing a sublimable dye is provided on a paper or a polyester film, and is also heat-melted. The mold heat transfer sheet is one in which a pigment is dispersed in a heat-fusible binder such as wax in place of the dye layer to form an ink layer, and any conventionally known heat transfer sheet can be used as it is in the present invention. or,
Any conventionally known applying means can be used as the applying means of the thermal energy at the time of thermal transfer. For example, a thermal printer (for example, a video printer VY-10 manufactured by Hitachi, Ltd.) can be used.
By controlling the recording time with a recording apparatus such as 0), it is possible to sufficiently achieve the intended purpose by applying thermal energy of about 5 to 100 mJ / mm ² . Further, as the copying apparatus, an ordinary mono-color or full-color electrophotographic copying machine is used.

[0012]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. In the text, “part” or “%” is based on weight unless otherwise specified. Example 1 A transparent polyethylene terephthalate film (T-60, thickness 100 μm, manufactured by Toray) was used as a substrate sheet, and the coating liquid for a primer layer described below was applied to one side of the film at a rate of 1 g / m ² when dried by a bar coater. The coating solution for the receiving layer having the following composition is coated on the same surface with a bar coater at a rate of 5.0 g / m ² when dried and dried at 120 ° C. And dried in an oven for 5 minutes to form a dye receiving layer. Receptor layer coating liquid polyester resin (TOYOBO, Byron 600) 4.0 parts Vinyl chloride-vinyl acetate copolymer (# 1000A, manufactured by Electrochemical) 6.0 parts Amino-modified silicone (Shin-Etsu Chemical, X- 22-3050C) 0.2 part Epoxy-modified silicone (X-22-3000E manufactured by Shin-Etsu Chemical Co., Ltd.) 0.2 part Methyl ethyl ketone / toluene (1: 1) 89.5 parts Polyester polyol coating liquid for primer layer (Toyo Morton 15.0 parts Methyl ethyl ketone / toluene (2: 1) 85.0 parts The following backside slip layer coating liquid was applied to the surface opposite to the receiving layer at a solid content of 3 g / m ^2. An image receiving sheet of the present invention was obtained by drying in the same manner as above. Backside slip layer coating liquid 1,3-butadiene / dimethylaminoethyl methacrylate / ethylene glycol dimethacrylate quaternized copolymer (molar ratio 30: 65: 5) 10.0 parts Teflon filler (Lubron L5, Daikin Industries, Ltd.) 0.1 part Ethanol 89.8 parts

Examples 2 to 4 The image receiving sheet of the present invention was obtained in the same manner as in Example 1 except that the following monomers were used in place of the tertiary amino group-containing monomer in Example 1. Example 2 Diethylaminoethyl methacrylate Example 3 Diethanolaminoethyl methacrylate Example 4 Dipropylaminoethyl methacrylate Comparative Example 1 An image receiving sheet of Comparative Example was prepared in the same manner as in Example 1 except that the slip layer was not formed. Obtained. Thermal Transfer Test The dynamic friction coefficient (30
0 g load), surface electric resistance value (Ω) (A: immediately after production,
B: After leaving at 50 ° C. for 100 hours) and the feeling of sliminess, and using a three-color thermal transfer sheet, a printer (manufactured by Mitsubishi Electric, S-340) was used at a temperature of 5 ° C. and 20% RH to produce yellow, magenta and cyan. A full-color image was formed in this order, and the paper feeding / discharging performance of the image receiving sheet (the number of double feeds when 100 sheets were conveyed) was examined, and the results shown in Table 1 below were obtained.

[0014]

[Table 1] Example 5 An OHP image-receiving sheet of the present invention was obtained in the same manner as in Example 1 except that the dye receiving layer was not formed. Comparative Example 2 An image receiving sheet of Comparative Example was obtained in the same manner as in Example 1 except that the slip layer in Example 5 was formed from the following coating liquid. Backside slip layer coating liquid acrylic resin (BR-85, made by Mitsubishi Rayon) 10.0 parts Teflon filler (Lubron L5, made by Daikin Industries) 0.1 part Methyl ethyl ketone / toluene (1: 1) 89.5 parts Comparative Example 3 On the surface of the slip layer of Comparative Example 2, 0.5% isopropyl alcohol as an antistatic agent (Stachiside, manufactured by Takihara Sangyo Co., Ltd.) was applied at a solid content of 0.1 g to obtain an image receiving sheet of Comparative Example. Comparative Example 4 An image receiving sheet of Comparative Example was obtained in the same manner as Comparative Example 2 except that the amount of the filler in the slip layer coating liquid of Comparative Example 2 was changed to 5 parts. Copy Test Using the image receiving sheets of Example 5 and Comparative Examples 2 to 4,
When a color image was formed with a copying machine (Pixel-500, manufactured by Canon), the results shown in Table 2 below were obtained.

[0019]

[Table 2]

[0020]

As described above, according to the present invention, a layer made of a specific cationic resin is formed on the back surface of the image-receiving sheet, and a lubricant or the like is incorporated as necessary, so that the antistatic property and the slip property can be improved. An excellent image receiving sheet suitable for thermal transfer or copying is provided.

Claims (4)

[Claims] 1. A substrate sheet has an image forming surface on at least one surface thereof, and a slip layer is provided on the back surface thereof, and the slip layer comprises a (meth) acrylic acid ester monomer having a quaternary ammonium group. An image receiving sheet, which is a coating layer formed of a united body. 2. The thermal transfer image-receiving sheet according to claim 1, wherein the polymer further comprises 1,3-butadiene and a polyfunctional monomer. 3. The thermal transfer image-receiving sheet according to claim 1, wherein the slip layer contains a lubricant. 4. The image receiving sheet according to claim 1, wherein the base sheet is a transparent resin sheet for OHP.