JPS60101090A - Image receiving body for sublimation type thermal recording - Google Patents

Abstract

PURPOSE:To attain to enhance the light fastness of a dye image, by providing a dye depositing layer and a dye diffusing layer for covering the same while containing an ultrasonic absorber in the dye diffusing layer. CONSTITUTION:A dye depositing layer 2 and a dye diffusing layer 3 are supported by a substrate 4. The dye diffusing layer 3 is constituted by containing an ultraviolet absorber in a material based on a non-dyeable substance for facilitating the transmission of a dye sublimed from the dye-containing layer 6 of a dye transfer body 5 by the heat of thermal head 7. The dye transmitting through the layer 3 is caught by the dye depositing layer 2 to form a color and a dye image 8 is obtained. By this mechanism, ultraviolet rays being a main cause for fading the color of the dye image 8 in incident light 9 are absorbed by the ultraviolet absorber 10 in the dye diffusing layer 3 and do not reach the dye image 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a sublimation type heat-sensitive recording image receptor used for thermal transfer recording by dye sublimation, and is particularly applicable to high-speed recording using a T-device such as a thermal head or a laser beam. It is related to the image receptor.

Conventional Structures and Problems Many attempts have been made to obtain thermal transfer recording by dye sublimation. However, images recorded using dyes generally have the disadvantage of lacking stability, especially light resistance.

OBJECTS OF THE INVENTION The object of the present invention is to provide an image receptor for sublimation type heat-sensitive recording, which provides a dye image with particularly excellent light resistance.

Structure of the Invention The image receptor for sublimation type heat-sensitive recording of the present invention is characterized in that it has a dye dyed layer and a dye diffusion layer covering this layer, and the dye diffusion layer contains a purple ray absorber.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional front view of a recording example using an image receptor 1 for sublimation type thermosensitive recording, in which a dye-dyed layer 2 and a dye diffusion layer 3 are supported on a substrate 4. Dye Diffusion Layer 3 Since it forms the main part of the structure of the present invention, its function will be explained in detail. The dye/diffusion layer 3 is usually made of a material mainly consisting of a non-dying substance that facilitates the passage of the dye sublimated from the dye-containing layer 6 of the transfer body 5 by the Is pc of the thermal head 7. be done. The dye that has passed through the dye diffusion layer 3 is transferred to the dye dyeing layer 2
The dye is captured by the dye and develops color, giving a dye image 8. This state is shown in FIG. The excellent lightfastness of dye image 8 can be interpreted as follows. That is, among the light 9 incident on the dye image 8 , ultraviolet rays, which are the main cause of discoloration of the dye image 8 , are absorbed by the ultraviolet absorber 10 in the dye diffusion layer 3 and do not reach the dye image 8 .

This effect is extremely superior to the case where the ultraviolet absorber 10 is simply included in the dye-dyed layer 2.

In addition, the dye diffusion layer 3 also has the function of physically or chemically protecting the dye-1 image 8. That is, since the dye image 8 is protected by the dye diffusion layer 3, it is less susceptible to mechanical damage, contamination, or deterioration due to oxidation.

The suitable thickness of the dye diffusion layer 3 is in the range of 0.05 to 5 μm, and when it is in the range of <rrco, 1 to 2 μm, sufficient light resistance can be imparted to the dye image 8, and the sublimation The recording density of the dye image 8 is not reduced because the dye molecules easily pass through. decided, the volume ratio in the dye diffusion layer 3 is 0.1~
A range of 30% gives good results. If it is less than 0.1%, the ultraviolet absorption effect will be insufficient, and if it is more than 30%, it will cause background staining of the image receptor 1 for sublimation type heat-sensitive recording, which is inappropriate.

In addition, in order to improve the recording density of dye A 1 image 8.

Dyeing substances may also be used. Even in this case, the effects of the present invention are not diminished when the non-staining substance is contained; R is 50% or more by volume.

Phenyl salicylate is a UV 1 absorber.

p-ocnalphenylsalicylate-1, p-t-n'tylfuryl-l-nylsalicylate, 2,4-dihydroxy/pensonoea), 2-hydroxy-4-methoxybe7nono,
1-None, 2,2'-dihydroxy-4-meth(・ki/be/sifgonone, 2,2'-dihydroxy-4,4'-
Dimethoxybenzinoenone, 2,2'-dihydro IJ
4,4'-dimethoxy-6-sulfobenzophenone, 2-hydroxy-4-me, 5-sulpobenzophenone I-IJ hydrate, 2-hydroxy-4-
n-octoxybenzophenono, 4-dodenroxy 2
-Vitroky7bennoenone 2 (2/-hydroxy-3',5'-di-monobutyl-phenyl)benzotriazole, 2-(2'-hydroxy-3'-[-butyl-6'-methyl- enyl)-6-chlorobenzotriazole.

2-(2'-Hydroxy-3',5'-di-tert-butyln-el)-s-chlorobenzotriazole, 2(2/
-Hydroxy-4'-n-octoxyphenyl)penztriazole, ethyl-2-cyano-3,3-diphenylacrylate, and the like are effectively used.

Further, as non-dyeable substances, binders that are difficult to be miscible with dyes such as polyethylene, polystyrene, and SBR, and inorganic substances such as calcium carbonate and barium sulfate are effectively used. The main components of the dye-dyed layer 2 include polyester,
Binders that are easily compatible with dyes such as polymethacrylic acid ester and polyamide, and inorganic solid acids such as activated clay particles and activated silicic anhydride fine powder are effective.

Furthermore, particularly excellent results can be obtained when a compound having the following structure is added to the dye-dyed layer 2.

The molecules represented by formula A absorb the excitation energy of the dye molecules 8a, which are excited by absorbing the ultraviolet rays that have passed through without being captured by the ultraviolet absorber 10, and the dye molecules 1-
This can be understood to be due to the stabilization of 5a. The effective blending ratio of these compounds is in the range of 0.1 to 30% in the dye-dyed layer 2 based on the 41t ratio.

The present invention will be explained in further detail in the following examples.

Example 1 Coating liquid A prepared below was applied onto polypropylene synthetic paper to form a dye-dyed layer. On top of this, emulsion type coating solution B is further applied so that the film thickness of the dye diffusion layer is Q, 1,
Coating was carried out so that the coating thickness was 0.5 and 2 μηt to obtain an image receptor for sublimation type heat-sensitive recording.

Coating iA: Polyester (trade name: Vylon 200): 10 parts by volume Activated clay particles (particle size 2μ++t): 20 parts by volume Monochlorobenzene H1oo body + LJ coating liquid B; SBR: 10 parts by volume Polyethylene resin: 20 parts by volume Silicic anhydride Powder (particle size: 200): 10 parts by volume 2-hydroxy-4-methoxy-benzo 0.05, 0.5° phenone-6-sulfonic acid 5 (44 parts water = 10 parts
O parts by volume - power, disperse dye (C,
72.0%; H, s, e ratio; N, 21.9%) 12μt? A dye transfer material was prepared by coating with a wire bar onto a capacitor paper having a thickness of i.

The coated parts of the dye transfer body and the image receptor for sublimation type heat-sensitive recording were brought into close contact with each other so as to face each other, and a magenta recorded image was drawn with a thermal head. The recording conditions were as follows.

Linear density of main scanning and sub-scanning: 4 dots/m111 Recording power: 0.7 W'/dot head heating time: 8 ms As a result, the recording density was 1.6 or more, and the sunlight fastness (JIS, LOs 41) was I got a 3rd grade image.

In addition, 2 parts by volume of a compound represented by the structural formula shown in [Coating] 2.A was added to prepare a y1 layer '1'+', 41;9 thermal recording image receptor in the same manner. An image with a recording density of 1.5 or higher and a sunlight fastness of grade 4 was obtained under the same conditions as above.

In addition, when an image receptor without a dye diffusion layer was used as a comparative example, the sunlight fastness was grade 1.

Effects of the Invention As described above, the dye sublimation type heat-sensitive recording image receptor of the present invention provides a dye image with excellent light resistance.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a recording device using a sublimation type heat-sensitive recording image receptor according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing the light resistance of the image receptor, and FIG. This is an IR chart. 1...Image receptor for sublimation type thermosensitive recording, 2...
Dye dyeing layer, 3...Dye diffusion layer, 8...
・Dye image, 8a...Dye molecule, 10...
...Ultraviolet, glandular absorbent. Name of agent: Patent attorney Toshio Nakao and one other person
1 Mortar Diagram 2

Claims (1)

[Claims] An image receptor for sublimation type heat-sensitive recording, which has a dye-dyed layer and a dye-diffusing layer covering the dye-dyed layer, and the dye-diffusing layer contains an ultraviolet absorber.