JPS59214696A - Thermal transfer accepting sheet - Google Patents

Abstract

PURPOSE:To provide the titled accepting sheet improved in density, sharpness and storage stability, constituted by providing a receiving layer comprising a mixture consisting of a heat softenable and meltable resin showing dyeability to the sublimable and vaporizable dye of a transfer sheet and an org. filler. CONSTITUTION:A heat softenable and meltable resin showing dyeability to a sublimable and vaporizable dye (e.g., pref., a resin with a softening point of 60- 120 deg.C such as an aminoalkyd resin, polyamide, polyurethane or PVC) and an org. filler (e.g., pref., one being a fine particle with a particle size of 10mum or less of a high-molecular polymer such as methyl cellulose, PS, polyurethane or polyvinyl acetate) are contained pref. in a wt. ratio of 1/9-9/1 to prepare a receiving layer coating liquid which is then applied onto a sheet such as a paper or plastic sheet as a substrate and dried to obtain an objective accepting sheet. Said sheet is used in combination with a transfer sheet having a sublimable and vaporizable dye-containing transfer layer.

Description

Detailed Description of the Invention [Technical Field] The present invention is used in combination with a transfer sheet having a transfer layer containing a sublimable or vaporizable dye, and which receives the sublimated or vaporized dye by heating the transfer sheet. Conventionally, a transfer sheet having a transfer layer containing a sublimable or vaporizable dye is overlaid on a receiving sheet, and the transfer sheet is heated to sublimate or transfer the dye contained in the transfer layer. Thermal transfer is known in which dyes are evaporated onto a receiving sheet to form a dye image on the receiving sheet.

In this case, paper, synthetic paper, plastic film, etc. are used as the receiving sheet, and in order to improve the dyeability, a sheet coated with an inorganic compound such as silica or calcium carbonate along with a binder is used. .

By the way, when using a receiving sheet whose surface is coated with an inorganic compound, the resulting dye image is improved in density, sharpness, and fading resistance compared to when paper itself is simply used as the receiving sheet. , was still not satisfactory.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to provide a receiving sheet for thermal transfer that provides a dye image that is significantly improved in density, sharpness, fading resistance, and storage stability, and is also excellent in fading resistance and storage stability.

〔composition〕

According to the present invention, there is provided a receiving sheet which is used in combination with a transfer sheet having a transfer layer containing a sublimable or vaporizable dye, and which receives the dye sublimated or vaporized by heating the transfer sheet, There is provided a receiving sheet for thermal transfer, comprising a receiving layer made of a mixture of a heat-softening meltable resin and an organic filler that exhibits dyeability with the sublimable or vaporizable dye.

The receiving sheet for thermal transfer of the present invention is characterized in that a receiving layer made of a mixture of a heat-melting resin and an organic filler that exhibits dyeability with sublimable or vaporizable dyes is provided on its surface. .

In the receiving sheet of the present invention, as the resin used to form the receiving layer, any resin can be used as long as it is heat-softening and meltable and can be easily dyed with sublimable or vaporizable dyes. Various polymers well known in the art can be used. Examples of such materials include amino alkyd resin, polyamide, polyurethane, polyvinyl chloride, polyvinyl acetate, polyester, acrylic resin, acetal resin, polyvinyl alcohol, polyvinylidene chloride, polyvinyl acetal, polystyrene, polycarbonate, and epoxy resin. etc. In the case of the present invention, it is preferable to use a resin having a softening point of 60 to 120°C. As the organic filler, various polymer fine particles are employed, but the particle diameter is preferably 10 μm or less. Examples of polymers constituting the organic filler include methylcellulose, ethylcellulose, polystyrene, polyurethane, urea/formalin resin, melamine resin, phenol resin, iso(or diiso)butylene/maleic anhydride copolymer, styrene/maleic anhydride. Acid copolymer, polyvinyl acetate, polyvinyl chloride, vinyl chloride/vinyl acetate copolymer, polyester, polyacrylate, poly.

Examples include tacrylic acid ester, styrene/butadiene/acrylic copolymer, and the like.

To carry out thermal transfer using the receptor sheet of the present invention, the transfer layer of the transfer sheet and the receptor layer of the receptor sheet are brought into polymeric contact;
Heating may be performed from the side of the transfer sheet that does not have the transfer layer, the opposite side, or both sides. By this heating, the dye contained in the transfer layer is sublimated or vaporized, and the surface of the resin forming the receiving layer of the receiving sheet is softened and melted, and the vaporized dye enters the molten resin and is dyed. Therefore, in the case of the present invention, after the transfer is completed, the dye molecules are incorporated into the resin, so the fading resistance and storage stability of the resulting dye image are significantly improved, and a large amount of dye is adsorbed, so that the image is The density and sharpness are also very good.

In addition, examples of the sublimable dye or vaporizable dye that can be applied to the transfer sheet include those shown below.

Note that the term "sublimable dye" as used in the present invention means a dye that directly vaporizes from a solid state to a vapor when heated, and the "vaporizable dye" refers to a dye that vaporizes from a liquid state to a vapor state when heated.

In the receptor sheet of the present invention, a receptor layer coating solution containing the dyeable heat-softening meltable resin and an organic filler is applied onto a sheet of paper, synthetic paper, plastic film, aluminum foil, etc. as a substrate. Manufactured by coating and drying. In this case, the dyeable resin is usually applied in the form of an aqueous emulsion, but of course it can also be applied by a hot melt method or the like in some cases. The ratio of the resin to the counterfeit filler is preferably 179 to 9/l by weight. In addition, when applying the receptive layer coating liquid to the substrate surface, it is possible to apply it to the entire surface of the substrate.
It is also possible to apply only the necessary parts, for example image-wise, depending on the desired dye image.

In the receiving sheet of the present invention, the organic filler mixed with the resin of the receiving layer exhibits the effect of facilitating peeling of the receiving sheet from the transfer sheet after completion of transfer. In the case of the present invention, the lower the softening point of the resin in the receptor layer, the better the pigmented image will be. makes peeling extremely difficult. The use of organic fillers solves these peeling problems. In addition, the organic filler prevents the heat transferred from the transfer layer to the receptor layer from escaping toward the substrate, and exhibits the effect of increasing the effective utilization rate of the heat that is effectively utilized for softening and melting the resin.

〔effect〕

The receiving sheet for thermal transfer of the present invention has the above-described structure, and the dye image formed on the receiving sheet has excellent fading resistance and storage stability, and is extremely excellent in density and sharpness.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples. Note that all parts and percentages shown below are based on weight.

Example 1 Polyester resin emulsion 40 parts (resin concentration 50%) Styrene resin fine particles 20I/water
40//The above composition was stirred and mixed for 1 hour, and the basis weight was 50 g/n (
A receptor sheet was prepared by coating and drying the mixture on high-quality paper to a dry weight of 4 g/rrr.

Example 2 Acrylic resin emulsion 40 parts (resin concentration 50%) Urea-formalin condensate resin particles 201! water
40Il
Using the above composition, it was applied to high quality paper and dried in the same manner as in Example 1 to prepare a receiving sheet.

Comparative Example 1 A comparative receiving sheet was prepared in the same manner as in Example 1, except that calcium carbonate was used instead of the styrene resin fine particles.

Comparative Example 2 A comparative receiving sheet was prepared in the same manner as in Example 1, except that silica was used instead of the styrene resin fine particles.

Comparative Example 3 A comparative receiving sheet was prepared in the same manner as in Example 2, except that calcium carbonate was used instead of the urea-formalin condensate resin fine particles.

Comparative Example 4 A comparative receiving sheet was prepared in the same manner as in Example 2, except that silica was used instead of the urea-formalin condensate resin particles.

Comparative Example 5 Using the polyester resin emulsion itself shown in Example 1 as a coating liquid, it was coated on high-quality paper at a dry weight of 2 g/I and dried to prepare a receiving sheet for comparison.

Comparative Example 6 High-quality paper with a basis weight of 50 g/rrr was used as it was as a receiving sheet.

Receiving sheet and sublimable dye prepared as above (manufactured by Nippon Kayaku Co., Ltd., trade name KaYaSe+Blueee TD-P)
The coated and dried transfer papers were stacked and heated at 200° C. for 2 seconds, and the density, sharpness, and fading resistance (fade meter 20 hours) of the resulting images were evaluated using a 5-point evaluation method.

The results are shown in the table below.

Table-1 * Image evaluation could not be performed because the transfer paper and receiving paper sheet were sticky.

Evaluation Criteria 5: Very Good 4: Good 3: Fair 2: Bad ■ = Very Bad Patent Applicant Rico Co., Ltd. - Agent Patent Attorney Toshiaki Ikeura

Claims (1)

[Claims] (1) A receptor sheet that is used in combination with a transfer sheet having a transfer layer containing a sublimable or vaporizable dye, and that receives the dye sublimated or vaporized by heating the transfer sheet, the surface of which is coated with the sublimated dye. 1. A receptor sheet for thermal transfer, comprising a receptor layer made of a mixture of a heat-softening meltable resin and an organic filler that exhibits dyeability with volatile or vaporizable dyes.