JPH0591861U - Thermal transfer image receiving sheet - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the uniformity and sharpness of the transferred image on the thermal sublimation transfer image-receiving sheet. [Structure] A white layer 2 made of an alkyd resin in which titanium white is dispersed, a vinyl chloride / vinyl acetate copolymer and a polyester resin is formed on the upper surface of the base material 1, and an epoxy resin or an acrylic resin is formed on the upper surface of the white layer 2. The anchor layer 4 is formed, and a solvent solution of polyethylene terephthalate resin is applied to the upper surface of the anchor layer 4 to form the image receiving layer 3. [Effect] Since the anchor layer 4 made of a synthetic resin material having a low heat shrinkage rate and a sublimable dye hardly penetrating is provided, a uniform transferred image can be obtained clearly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thermal sublimation transfer image-receiving sheet used in combination with a thermal transfer sheet.

[0002]

[Prior Art]

 Conventionally, as a thermal sublimation transfer image-receiving sheet of this type, for example, as shown in FIG. 3, a substrate 1 made of polypropylene resin and a surface layer (upper layer) made of porous polypropylene resin on the upper surface of a substrate 1 made of synthetic paper, an alkyd resin, A coating in which a white pigment such as titanium white is dispersed is applied to a solvent solution of vinyl chloride / vinyl acetate copolymer and polyester resin to form a white layer (concealment layer) 2, and the white layer 2 has an upper surface. It is known to provide an image receiving layer 3 (receptive layer) for receiving a sublimable dye which migrates from a thermal transfer sheet when heated. That is, the thermal sublimation transfer image-receiving sheet is used in combination with a thermal transfer sheet (transfer ribbon) in which a thermal transfer layer made of a sublimable dye, a binder, etc. is provided on one surface of a thin paper or a synthetic resin film. The sublimation transfer image-receiving sheet is superposed so that the thermal transfer layer and the image receiving layer are in contact with each other, and is heated from the back side of the thermal transfer sheet by a heating means such as a thermal head to sublimate the sublimable dye in the thermal transfer layer to thereby sublimate the image receiving layer. An image is formed by permeating the dyeing layer.

[0003]

[Problems to be solved by the device]

 However, in this conventional thermal transfer image receiving sheet, since the image receiving layer 3 and the substrate 1 are easily contracted by the heat of the thermal head at the time of image formation, wrinkles are generated or curling occurs, so that the thermal transfer image receiving sheet itself is not smooth. In addition, the sublimable dye easily penetrates into the white layer 2 during transfer, so that the dye cannot be sufficiently fixed in the image receiving layer 3, so that the image tends to be uneven and unclear. There was a problem. Further, the silicone oil contained in the coating material of the image receiving layer 3 is melted under the influence of heating during the production or printing of the thermal transfer image receiving sheet and penetrates into the white layer 2 side, so that the surface of the image receiving layer 3 There was also a problem that the amount of bleed-out of silicone oil to the (upper surface) was insufficient and heat fusion occurred with the thermal transfer sheet. The present invention solves the above-mentioned conventional problems by providing an anchor layer made of epoxy resin or acrylic resin between the image receiving layer and the white layer.

[0004]

[Means for Solving the Problems]

 The present invention relates to a thermal transfer image-receiving sheet in which an image-receiving layer for receiving a dye transferred from a thermal transfer sheet upon heating is provided on the upper surface of a substrate through a white layer formed of a synthetic resin containing a white pigment, wherein the white layer The thermal transfer image receiving sheet is characterized in that an anchor layer made of an epoxy resin or an acrylic resin is formed between the image receiving layer and the image receiving layer. Further, the present invention is a thermal transfer image-receiving sheet in which a curl prevention layer made of a low shrinkage resin such as epoxy resin, acrylic resin, polyester resin is formed on the lower surface of the substrate.

[0005]

[Action]

 In the thermal transfer image-receiving sheet of the present invention, an anchor layer made of a synthetic resin material having a low heat shrinkage ratio and a sublimation dye that hardly penetrates is provided between the image-receiving layer and the white layer, so that the image-receiving layer and the base material are contracted by the thermal head. The thermal transfer image-receiving sheet can be kept smooth, and the sublimable dye does not penetrate into the white layer, which improves the uniformity and sharpness of the image and also prevents curling of the entire thermal transfer image-receiving sheet. Moreover, since the silicone oil is efficiently bleed out to the surface of the image receiving layer, heat fusion with the thermal transfer sheet does not occur. According to the invention of claim 2, since the curl prevention layer having a low heat shrinkage rate is also provided on the lower surface of the substrate, a thermal transfer image receiving sheet having a more remarkable curl prevention property as compared with the case where only the anchor layer is provided is obtained. Be done.

[0006]

【Example】

 (Embodiment 1) An embodiment of the present invention will be described with reference to FIG. 1. A synthetic paper having a base material of polypropylene and a surface layer of porous polypropylene is used as a base material 1, and the surface layer has an alkyd resin and vinyl chloride. A solution of titanium acetate dispersed in a solvent solution of a vinyl acetate copolymer and a polyester resin is applied to form a white layer 2, and an epoxy resin coating or an amino acrylic resin coating (both are provided on the white layer 2). (Containing a curing agent) to form an anchor layer 4, and a solvent solution of polyethylene terephthalate resin is further applied to the upper surface of the anchor layer 4 to form an image receiving layer 3 to form a thermal sublimation transfer image receiving sheet. . Sheet A coated with the above epoxy resin paint ₁ , Sheet A coated with amino acrylic resin paint₂That. As a comparison target (conventional example), a thermal sublimation transfer image-receiving sheet B (hereinafter referred to as sheet B) having a sectional structure shown in FIG. 3 was prepared. In this case, the conditions for forming the substrate 1, the white layer 2 and the image receiving layer 3 are sheet A₁, A₂Same as. Then, the above sheet A₁, A₂Sheets A and B were subjected to thermal transfer under the normal conditions by the thermal sublimation transfer method.₁, A₂The transfer image of the sheet A is significantly more uniform and clear than that of the sheet B.₁, A₂It was confirmed that the overall curl was significantly reduced as compared with the sheet B. Further, when the heat fusion state of each sheet with the thermal transfer sheet was examined, a partial heat fusion was observed in the sheet B, but the sheet A₁, A₂Then, heat fusion did not occur.

Example 2 For the sheet A ₁ prepared in Example 1, as shown in FIG. 2, the same epoxy resin coating, aminoacryl resin coating, or polyester resin coating as in Example 1 was applied to the lower surface of the substrate 1. After coating, a curl prevention layer 5 was formed to obtain three types of thermal sublimation transfer image-receiving sheets, and the curl state of the sheet due to thermal transfer was examined under the same conditions as in Example 1. As a result, in almost all cases, curl was observed. It didn't happen.

[0008]

[Effect of the device]

 In the thermal transfer image receiving sheet of the present invention, an anchor layer made of an epoxy resin or an acrylic resin is provided between the image receiving layer and the white layer, so that a uniform and clear transfer image can be obtained and the curl of the thermal transfer image receiving sheet due to the thermal transfer is reduced. It provides an excellent effect such as effective bleed-out of silicone oil and prevention of heat fusion with the thermal transfer sheet. In the invention of claim 2, since the curl preventing layer of epoxy resin, acrylic resin, polyester resin or the like is also provided on the lower surface of the base material, curling hardly occurs.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a partial vertical sectional view showing another embodiment of the present invention.

FIG. 3 is a partial vertical cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Base Material 2 White Layer 3 Image Receiving Layer 4 Anchor Layer 5 Curling Prevention Layer

Claims (2)

[Scope of utility model registration request] 1. A thermal transfer image-receiving sheet comprising an upper surface of a base material and an image-receiving layer for receiving a dye transferred from the thermal transfer sheet upon heating, via a white layer formed of a synthetic resin containing a white pigment. Between the image receiving layer and
A thermal transfer image-receiving sheet having an anchor layer formed of an epoxy resin or an acrylic resin. 2. The thermal transfer image receiving sheet according to claim 1, wherein a curl prevention layer made of epoxy resin, acrylic resin, polyester resin or the like is formed on the lower surface of the base material.