JP3137747B2 - Sublimation type image transfer sheet for thermal transfer - Google Patents

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 A sublimation type thermal transfer recording system has attracted 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 showing a strong dyeing property to a sublimable dye is mainly used as the image receiving sheet. However, the resin has low heat resistance, and thus has a problem that the resin easily fuses with the transfer member during recording. Therefore, various image receiving sheets with improved heat resistance have been proposed. However, if the heat resistance is increased and the effect of preventing fusion is enhanced, the recording density often becomes a problem.

[0003] In this respect, in particular, the image-receiving sheet is superimposed on the sublimation-type thermal transfer medium, and {the speed of the image-receiving sheet} / {the speed of the recording medium}> 1, or {the feed amount of the image-receiving sheet} / {the feed amount of the recording medium}. A problem arises in a recording method in which thermal printing is performed from the back surface of the recording medium while both of them are running under the condition of> 1, and the dye in the transfer body at that portion is transferred onto the image receiving sheet.

[0004]

SUMMARY OF THE INVENTION The present invention provides an image-receiving sheet having high heat resistance. For example, even in an n-times mode recording method, fusing between a transfer member and the image-receiving sheet, poor running, and furthermore, an ink layer is not formed. The purpose of the present invention is to obtain a transferred image having a good image density without causing thermal transfer or wrinkling of a transfer body.

[0005]

The present invention provides an n-times mode recording.
In a receiving layer provided on an image receiving substrate suitable for a recording system , A: a dyeing resin comprising a resin having active hydrogen, an isocyanate compound and a cured product; B: a heat-releasing silicone resin; C: a reaction with an isocyanate compound Non-lubricating lubricant,
Which is a sublimation type image transfer sheet for thermal transfer.

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

Although 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-times mode method, it is not clear that the solid heat releasing resin ( B) and lubricant having fluidity (C)
It is considered that by containing both of these in the receiving layer, the lubricity at the interface between the ink layer and the receiving layer is remarkably increased during friction, and the thermally stable lubrication is exhibited. In addition, the content of the lubricant (C) such as oil can be used in a smaller amount when used in combination with the heat releasing resin (B) than when used alone. Dots that wake up,
It also has the effect of improving image blur, set-off, and tactile sensation.

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

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

[0010] A: dyeable resin, the resin to make a cured product by isocyanate and urethane bonds have an active hydrogen and Lee
It is a resin formed by reacting with a socyanate compound.
Polyester and vinyl chloride resin are particularly preferable as the resin for producing the dyeing resin. Specifically, as polyester, Byron 200, Byron 300, Byron 500, GV-110, GV-230, UR-120
0, UR-2300, EP-1012, EP-103
2, DW-250H, DX-750H, DY-150H
(Manufactured by Toyobo), Tenka Vinyl 1000C, 1000CS, 1000CK, 1000G as vinyl chloride
K, 1000 GKT, 1000 GSK (all manufactured by Denki Kagaku Kogyo) and the like.

B: A silicone resin which is a resin having heat resistance and releasability and having a glass transition temperature of 100 ° C. or more and a melting point or softening point of 200 ° C. or more is preferred. Silicone resins such as polyester modified
Also includes silicone resin. Compounding a curing agent or a crosslinking agent, etc.
It may be heat-cured or ultraviolet-cured.

C: As the lubricant, oils that are liquid at room temperature, waxes having a melting point of 100 ° C. or less, and the like can be used.
For example, petroleum lubricating oils such as liquid paraffin, hydrogen halides, diester oils, silicone oils, synthetic lubricating oils such as fluorosilicone oils, various modified silicone oils (alkyl-modified,
Silicone-based lubricating substances such as copolymers of organic compounds such as polyoxyalkylene glycols and silicones, silicones, etc., various fluorine-based surfactants such as fluoroalkyl compounds, fluorine such as ethylene trifluoride chloride low polymer System lubricating substances, waxes such as paraffin wax and polyethylene wax, higher fatty acids, higher fatty alcohols, higher fatty amides, higher fatty acid esters, higher fatty acid salts and the like. Among them, a silicone oil having no reactivity with an isocyanate compound is preferable, and a polyether-modified silicone oil is 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 the isocyanate.

The mixing ratio of the materials A, B, and C in the receiving layer is such that 5 to 100 parts by weight of B and 0.1 to 30 parts by weight of a lubricant are particularly preferable, and 5 to 15 parts by weight of the lubricant are added to 100 parts by weight of A. Appropriate.

[0014]

【Example】

Example 1 {Prescription for Receptive Layer} Vinyl chloride vinyl acetate vinyl alcohol copolymer (VAGH, manufactured by Union Carbide) 10 parts by weight Isocyanate (Coronate L, manufactured by Nippon Polyurethane) 5 parts by weight Polyester-modified silicone resin (AY42-125, 5 parts by weight Alkyl-modified silicone oil (SH230, made by Torre Silicone) 0.1 parts by weight Toluene 40 parts by weight 40 parts by weight methyl ethyl ketone 40 parts by weight The above mixed solution is about 150 μm thick using a wire bar.
On a synthetic paper (Yupo FPG150, Oji Yuka synthetic paper) to form a 5 μm receiving layer to obtain an image receiving sheet. Curing was performed at 60 ° C. for 50 hours.

<< Prescription for ink layer >> Sublimable 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 1 part by weight 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 70 parts by weight toluene 70 parts by weight methyl ethyl ketone 70 parts by weight
Using a wire bar, a 3 μm ink layer was formed on the thick aromatic polyamide film using a wire bar to obtain a transfer body.

Example 2 The alkyl-modified silicone oil in the receiving layer in Example 1 was replaced with a polyether-modified silicone oil (SH841).
0, manufactured by Toray Silicone Co., Ltd.).

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

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

Example 5 The procedure of Example 3 was repeated except that the polyether-modified silicone oil in Example 3 was changed to SH3749 (made by Toray Silicone).

Comparative Example 1 The procedure of Example 1 was repeated except that the alkyl-modified silicone oil was omitted.

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

Using the samples of the above Examples and Comparative Examples, printing was performed under the following printing conditions.

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 at the above.

[0024]

[Table 1]

(Note) The running conditions are sticking, wrinkling,
Density unevenness was visually determined, and thermal transfer of the ink layer was determined by observing the printed image and the printed ink sheet.

The image storability is as follows.
The image after storing for 00 hours is visually judged.

[0027]

According to the present invention, a thermosetting type dyeable resin is provided.
The use of the heat-releasable silicone resin prevents fusion with the ink layer in n-times mode recording, poor running, thermal transfer of the ink layer, and the generation of wrinkles by the lubricant. Such as polyether-modified silicone oil as a lubricant Isoshi
When a compound having no reactivity with an anate compound is used,
Release properties and lubricity are further improved, and stable recording can be performed.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-126291 (JP, A) JP-A-4-110192 (JP, A) JP-A-3-178484 (JP, A) JP-A-4- 52193 (JP, A) JP-A-3-227690 (JP, A) JP-A-3-210995 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41M 5/38-5 / 40

Claims (3)

(57) [Claims] 1. A receiving layer provided on an image receiving substrate suitable for an n-times mode recording system, wherein: A: a dyeable resin comprising a cured product of a resin having active hydrogen and an isocyanate compound; and B: a heat-releasing silicone. A sublimation type thermal transfer image receiving sheet comprising: a resin; C: a lubricant having no reactivity with an isocyanate compound. 2. The image receiving sheet according to claim 1, wherein the lubricant C is a polyether-modified silicone oil. 3. A dyeing resin of A is mixed with a lubricant of C in 5 parts.
The image receiving sheet according to claim 1, wherein the content of the image receiving sheet is from 15% to 15%.