JPH0624155A - Sublimation type thermal transfer image receiving sheet - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an image-receiving sheet free from wrinkles by preventing fusion with an ink layer in n-fold mode recording, running failure, and thermal transfer of the ink layer. [Structure] In the receiving layer provided on the image receiving substrate, A: a dyeing resin made of a cured product of a resin having active hydrogen and an isocyanate compound, B: a heat-releasing resin, and C: a reactivity with an isocyanate compound. It is an image-receiving sheet for sublimation thermal transfer characterized by containing a lubricant which does not have it.

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 used in a sublimation type thermal transfer recording system.

[0002]

2. Description of the Related Art The sublimation type thermal transfer recording system is drawing attention as a system capable of excellent halftone recording. Although the image quality depends on the quality of the image receiving sheet, a thermoplastic polyester resin that exhibits strong dyeability to a sublimable dye is usually mainly used as the image receiving sheet. However, since the above resin has low heat resistance, there is a problem that the resin is easily fused with the transfer body during recording. Therefore, various image-receiving sheets with improved heat resistance have been proposed, but if the heat resistance is increased and the effect of preventing fusion is improved, the decrease in recording density often becomes a problem.

This point is particularly due to the fact that the sublimation type thermal transfer medium and the image receiving sheet are superposed and {image receiving sheet speed} / {recording medium speed}> 1, or {image receiving sheet feed amount} / {recording medium feed amount}. There is a problem in a recording method in which both are run under the condition of> 1 and thermal printing is performed from the back surface of the recording material to transfer the dye in the transfer material at that portion onto the image receiving sheet.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides an image-receiving sheet having high heat resistance. Even in the n-fold mode recording system, fusion between the transfer body and the image-receiving sheet, poor running, and further ink layer formation. It is possible to obtain a transferred image with good image density without causing thermal transfer and wrinkling of the transfer body.

[0005]

According to the present invention, in a receiving layer provided on an image receiving substrate, A is a dyeing resin comprising a resin having active hydrogen, an isocyanate compound and a cured product, and B is a thermal releasability. A sublimation-type image transfer sheet for thermal transfer, comprising: a resin, C: a lubricant having no reactivity with an isocyanate compound.

The C lubricant is preferably a polyether modified silicone oil. In addition, for dyeing resin A, C
It is preferable to contain the lubricant of 5 to 15%. In addition, A,
Each of the B and C materials may be a mixture of two or more materials.

It is not clear why the image-receiving sheet having the above structure can prevent various troubles caused by friction between the ink layer and the receiving layer by recording by the n-fold mode method. However, a solid thermal releasable resin ( Lubricant (C) having fluidity with B)
It is considered that the inclusion of both of these in the receptive layer remarkably enhances the lubricity of the ink layer / receptive layer interface at the time of rubbing, and exhibits a thermally stable lubricity. Further, the content of the lubricant (C) such as oil can be used in a smaller amount when it is mixed with the heat release resin (B) than when it is used alone. Bleeding due to dots,
It also has the effect of improving image blurring, offset, and touch.

The image-receiving sheet of the present invention may have an intermediate layer and a back layer as required.

Next, the materials A, B and C contained in the receiving layer in the present invention will be described in detail.

A: The dyeable resin may be any one having active hydrogen and capable of forming a cured product with isocyanate, but polyester and vinyl chloride resins are particularly preferred. Specifically, as polyester, Byron 200, Byron 30
0, Byron 500, GV-110, GV-230, U
R-1200, UR-2300, EP-1012, EP
-1032, DW-250H, DX-750H, DY-
150H (manufactured by Toyobo), vinyl chloride type Denka vinyl 1000C, 1000CS, 1000CK, 1
Examples include 000GK, 1000GKT, and 1000GSK (all manufactured by Denki Kagaku Kogyo).

B: The heat-releasing resin may be any resin having heat resistance and releasability, and has a glass transition temperature of 100.
There is no particular limitation as long as it is a resin having a melting point or softening point of 200 ° C. or higher and a melting point or softening point of 200 ° C. or higher. For example, thermosetting resins such as epoxy resin, silicone resin, xylene resin, urea resin, melamine resin, unsaturated polyester resin, alkyd resin, and furan resin, and cellulose acetate, cellulose butyrate acetate, and polysulfone showing relatively high heat resistance. , Thermoplastic resins such as polycarbonate and polystyrene. Each is mixed with a curing agent or a crosslinking agent,
It may be heat-cured or UV-cured.

C: As the lubricant, oils which are liquid at room temperature and waxes having a melting point of 100 ° C. or less can be used.
For example, petroleum-based lubricating oil such as liquid paraffin, hydrogen halide, diester oil, silicone oil, synthetic lubricating oil such as fluorosilicone oil, various modified silicone oils (alkyl modified,
Polyether-modified etc.), silicone-based lubricating substances such as copolymers of organic compounds such as polyoxyalkylene glycol and silicone, various fluorosurfactants such as fluoroalkyl compounds, fluorine such as trifluorochloroethylene low polymer, etc. Examples thereof include system lubricating substances, waxes such as paraffin wax and polyethylene wax, higher fatty acids, higher aliphatic alcohols, higher aliphatic amides, higher fatty acid esters, and higher fatty acid salts. Of these, silicone oils having no reactivity with isocyanate compounds are preferable, and polyether-modified silicone oils are particularly preferable. When a reactive lubricant such as amino-modified silicone is used, the reactivity is higher than that of the dyeing resin, and an insoluble precipitate is formed with isocyanate, which cannot be used.

The mixing ratio of the materials A, B, and C in the receiving layer is 5 to 100 parts by weight of B, 0.1 to 30 parts by weight of lubricant, and particularly preferably 5 to 15 parts by weight, relative to 100 parts by weight of A. Appropriate.

[0014]

【Example】

Example 1 {Recipient layer formulation} Vinyl chloride vinyl acetate vinyl alcohol copolymer (VAGH, Union Carbide Co., Ltd.) 10 parts by weight Isocyanate (Coronate L, Nippon Polyurethane Co., Ltd.) 5 parts by weight Polyester-modified silicone resin (AY42-125, Tore silicone) 5 parts by weight Alkyl-modified silicone oil (SH230, manufactured by Toray Silicone) 0.1 parts by weight Toluene 40 parts by weight Methyl ethyl ketone 40 parts by weight The above mixed solution has a thickness of about 150 μm using a wire bar.
Was coated on a synthetic paper (Yupo FPG150, Oji Okaka Synthetic Paper) to form a 5 μm receptive layer to obtain an image receiving sheet. Curing was performed at 60 ° C. for 50 hours.

{Ink layer formulation} Sublimation dye, Kayaset Blue 714 (manufactured by Nippon Kayaku) 16 parts by weight Polyvinyl butyral resin, BX1 (manufactured by Sekisui Chemical) 7 parts by weight Isocyanate, Coronate L (manufactured by Nippon Polyurethane) 2 parts by weight Part Amino-modified silicone oil SF8417 (made by Toray Silicone) 1 part by weight Epoxy-modified silicone oil SF8411 (made by Toray Silicone) 1 part by weight Toluene 70 parts Methyl ethyl ketone 70 parts
A 3 μm-thick ink layer was formed using a wire bar on the thick aromatic polyamide film using a wire bar to obtain a transfer body.

Example 2 The alkyl-modified silicone oil in the receptor layer in Example 1 was replaced with polyether-modified silicone oil (SH841).
0, manufactured by Torre Silicone), but in the same manner as in Example 1.

Example 3 Example 3 was repeated except that the amount of the polyether-modified silicone oil in Example 2 was changed to 1 part by weight.

Example 4 Example 4 was repeated except that the amount of the polyether-modified silicone oil in Example 2 was changed to 3 parts by weight.

Example 5 Example 3 was repeated except that the polyether-modified silicone oil used in Example 3 was SH3749 (made by Toray Silicone).

Comparative Example 1 Example 1 was repeated except that the alkyl-modified silicone oil in Example 1 was omitted.

Comparative Example 2 The procedure of Example 1 was repeated except that an amino-modified silicone oil (SF8417, manufactured by Toray Silicone) was used in place of the alkyl-modified silicone oil of Example 1.

Printing was performed under the following printing conditions using the samples of the above Examples and Comparative Examples.

Applied power: 442 mW / dot Thermal head: 6 dots / mm partial glaze type Speed ratio between image receiving sheet and recording medium: n = 1 to 15 Table 1 shows the running state and the thermal transfer state of the ink layer.

[0024]

[Table 1]

(Note) Running conditions are sticking, wrinkles,
The density unevenness is visually determined, and the thermal transfer of the ink layer is determined by observing the printed image and the ink sheet after printing.

The image storability is such that the printed image is stored at 60 ° C. in the dark.
Visually judge the image after storing for 00 hours.

[0027]

The present invention provides a thermosetting type dyeing resin,
By using the heat-releasing resin, fusion with the ink layer in n-fold mode recording, running failure, thermal transfer of the ink layer are prevented, and wrinkles are not generated by the lubricant. When polyether-modified silicone oil is used as a lubricant, releasability and lubricity are further enhanced and stable recording is possible.

Claims (3)

[Claims] 1. A receptive layer provided on an image receiving substrate, wherein A: a dyeing resin composed of a cured product of a resin having active hydrogen and an isocyanate compound, B: a heat releasing resin, and C: a reaction with an isocyanate compound. Non-lubricants,
An image-receiving sheet for sublimation thermal transfer, which comprises: 2. The image-receiving sheet according to claim 1, wherein the lubricant of C is a polyether-modified silicone oil. 3. A lubricant of C is added to 5 parts of the dyeing resin of A.
The image-receiving sheet according to claim 1, which contains -15%.