JPH03266692A - Sublimation type thermal transfer material - Google Patents

Abstract

PURPOSE:To obtain a sublimation type thermal transfer material excellent in slip properties and separability with respect to an image receiving sheet and showing excellent preservability by adding polydimethylsiloxane having the functional group reacting with a binder only at the single terminal of its molecule to an ink layer. CONSTITUTION:A sublimation type thermal transfer material is obtained by providing an ink layer wherein a sublimable dye is dispersed in a binder on a substrate and polydimethylsiloxane having the functional group reacting with the binder only at the single terminal of its molecule of polydimethylsiloxane in the ink layer reacts with the binder and the other terminal thereof is free, polydimethylsiloxane is oriented on the surface side of the ink layer without bleeding to the surface of the ink layer. Therefore, the dye dispersed in the binder in the ink layer is precipitated on the surface of the ink layer and the background contamination of an image receiving layer, the crystallization of the dye and the contamination of a heat-resistant layer and a thermal head become hard to generate and, since polydimethylsiloxane itself has slip properties and releasability, the melting preventing capacity of the ink layer is held and the slip properties and releasability thereof are well and the preservability thereof is also well.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a sublimation type thermal transfer material.

[Prior art] Conventionally, an image-receiving sheet is placed on the ink layer surface of a sublimation type thermal transfer body, which has an ink layer in which a sublimable dye is dispersed in a resin binder on a substrate, and a laser or a thermal head, etc. is applied from the transfer body side. There is a method of forming an image by applying thermal energy controlled by an electric signal to sublimate and transfer the ink in that area onto the image receiving sheet.

In principle, the second sublimation transfer method sublimates the dye in monomolecular form in response to thermal energy from a thermal head, etc.
This method has the advantage of easily obtaining halftones and allowing the gradation to be controlled at will, and is considered the most suitable method for full-color printers.

[Problems to be Solved by the Invention] By the way, there are two types of sublimation thermal transfer methods: a one-time recording method and a multi-recording method. In order to prevent frictional force between the layer and the image-receiving layer, fusion due to heat softening, etc.
It was proposed that a substance having lubricity or release properties be mixed into the ink layer of the transfer body.

Although certain improvements can be achieved by adding lubricating or releasing substances to the ink layer, the above substances added to the ink layer are generally incompatible with the binder in the ink layer. , easy to bleed onto the surface of the ink layer during storage.

In addition, because the glass transition temperature, melting temperature, and softening temperature are low,
As the content increases, the storage stability of the ink layer decreases, resulting in unused dye crystallizing or depositing on the surface of the ink layer during storage, and also causing background stains in non-image areas during recording. Problems also occur, such as the thermal head being contaminated due to contamination of the heat-resistant layer.

In view of these circumstances, it is an object of the present invention to provide a sublimation type thermal transfer material that is excellent in lubricity between the material and the image-receiving sheet and mold releasability, and also has excellent preservability.

Means for Solving 5 Problems] As a result of intensive studies to solve the above-mentioned problems, the present inventors have discovered that polydimethyl has a functional group reactive with a binder only at one end of the molecule in the ink layer. It was discovered that adding siloxane was effective, leading to the present invention.

That is, the present invention provides a sublimation thermal transfer material having an ink layer on a substrate in which a sublimable dye is dispersed in a binder, in which a functional group that reacts with the binder is contained in the ink layer only at one end of the molecule. This is a sublimation type thermal transfer material containing polydimethylsiloxane.

In the sublimation thermal transfer material of the present invention, as described above, only one molecular end of the polydimethylsiloxane in the ink layer reacts with the binder, and the other end is free. Polydimethylsiloxane is oriented toward the surface of the ink layer without bleeding. Therefore, the dye dispersed in the binder in the ink layer precipitates on the surface, making it difficult to cause background stains on the image-receiving layer, crystallization of the dye, contamination of the heat-resistant layer, and the thermal head.

Furthermore, since the polydimethylsiloxane oriented on the surface side of the ink layer itself has lubricity and release properties, the ability to prevent the ink layer from adhesion is maintained, and no inconvenience occurs during recording.

That is, the sublimation type thermal transfer material of the present invention has good lubricity and release properties, and also has good storage stability of the ink layer.

Known sublimation dyes, binders, etc. can be used in the sublimation type thermal transfer material of the present invention.

Sublimable dyes are dyes that sublimate or vaporize at temperatures above 60°C, and are mainly used in the field of thermal transfer recording such as disperse dyes and oil-soluble dyes, such as C31.
, Disperse Yellow 1.3.8, 9.1B, 41
．． 54. [io, 77, lie, etc., C11, dispers thread 1.4.6.11.15, 17.55.5
9.60.7383 etc., C, 1, Disperse Blue 3.14, 19.28° 5B, 60, 64, 72, 9
9,108 etc., C, 1, Solvent Yellow 77.
116 etc., C, 1, Solvent Red 23°25.
27 etc., C11, solvent blue ae, ga.

105 and the like. These dyes may be used alone or in combination.

Thermoplastic or thermosetting resins are used as binders for the ink layer, and examples of resins with relatively high glass transition points or high softening properties include vinyl chloride resins, vinyl acetate resins, polyamides, Polyethylene, polycarbonate, polystyrene, polypropylene, acrylic resin, phenolic resin, polyester, polyurethane,
Examples include epoxy resin, silicone resin, fluororesin, butyral resin, melamine resin, natural rubber, synthetic rubber, polyvinyl alcohol, and cellulose resin, but some or all of these resins exist at one end of the polydimethylsiloxane molecule. It has a functional group that reacts with a functional group.

In polydimethylsiloxane containing a functional group at only one end of the molecule contained in the ink layer, the reactive functional group includes amino, epoxy, epoxy-polyether, carboxylmercapto, hydroxyl, and the like.

The content of this substance in the ink layer is preferably 5 to 50% by weight.

If the content is less than 5%, the mold releasability and lubricity effects will be insufficient, while if it exceeds 5%, problems will occur in storage stability.

Further, the dye concentration of the ink layer is usually about 5 to 80%, preferably about 10 to 60%.

Further, as the base sheet, a film such as a capacitor Baba polyester film, a polystyrene film, a polysulfone film, a polyimide film, a polyamide film, etc. is used, and a conventional adhesive layer or the like is used between the base sheet and the ink layer as necessary. Alternatively, a conventional heat-resistant lubricant layer may be provided on the back surface of the base sheet, if necessary.

[Examples] Hereinafter, the present invention will be explained in more detail based on the following examples, but the present invention is not limited thereto.

Example 1 Polyvinyl butyral BX-1 [Sekisui Chemical ■] 7 parts by weight sublimable dye Kayaset Blue 7J4 [Nippon Kayaku ■]
7 parts by weight Polydimethylsiloxane BX1B-191 having an epoxy functional group on one side [Toμ・Silicone■] 3 parts by weight Diisocyanate・
Coronate and 2 parts by weight toluene
70 parts by weight Methyl ethyl ketone 70 parts by weight After dispersing the composition of the above formulation in a ball mill for 24 hours, a 6μ thick silicone resin heat-resistant layer with a thickness of 1 μm was formed on the back side.
A cyan ink layer having a thickness of 1.0 μI was formed on a polyethylene terephthalate film using a wire bar. This was further stored at 60°C for 24 hours to obtain a transcript.

Comparative Example 1 In Example 1, polydimethylsiloxane having an epoxy functional group on one side was replaced with dimethylpolysiloxane SH200.
Example 1 except that oil (to μ silicone ■) was used.
A transfer material was obtained in the same manner as described above.

Example 2 In Example 1, the sublimable dye Kayaset Blue
A transfer body was obtained in the same manner as in Example 1, except that 7147 parts by weight was changed to 14 parts by weight, the substrate was an aromatic polyamide film, and the ink layer thickness was changed to 3.0 μm.

Comparative Example 2 In Example 2, the polydimethylsiloxane having an epoxy functional group on one side was replaced with dimethylpolysiloxane S)I 2
A thermal transfer body was obtained in the same manner as in Example 2 except that 00 oil was used.

Example 3 Urethane acrylate V-4801 (Dainippon Ink & Chemicals ■) 9 parts by weight vinylpyrrolidone
1 part by weight Irgacure #651 (Ciba Geigi) 0.3 parts by weight Sublimation dye Kayaset Blue 714 10
Parts by weight Polydimethylsiloxane with methacrylic functional group on one side BX1B-1925 parts by weight Toluene 100 parts by weight Butyl acetate 80 parts by weight Isobutanol
After dispersing 20 parts by weight of the above composition in a ball mill for 24 hours, a 1.0 μl thick ink layer was applied to a 6 μl thick polyethylene terephthalate film with a 1 μl thick silicone resin heat-resistant layer formed on the back side using a wire bar. Formed. This is a high pressure mercury lamp (80W/cm
) for an irradiation time of 10 seconds to obtain a transfer body.

Comparative Example 3 In Example 3, polydimethylsiloxane having a methacrylic functional group on one side was replaced with dimethylpolysiloxane SH20.
A transfer body was obtained in the same manner as in Example 3 except that the transfer material was changed to 0 oil (to μ silicone #).

Example 4 In Example 3, the sublimable dye Kayaset Blue
A transfer body was obtained in the same manner as in Example 3 except that 7147 parts by weight was changed to 14 parts by weight, the substrate was an aromatic polyamide film, and the ink layer thickness was changed to 3.0 μl.

Comparative Example 4 In Example 4, polydimethylsiloxane having a methacrylic functional group on one side was replaced with dimethylborisiloxane SH20.
A transfer body was obtained in the same manner as in Example 4 except that the transfer material was changed to 0 oil.

Further, a coating liquid for a dye-receiving layer [Liquid A] was prepared by thoroughly mixing and dispersing a mixture having the following composition.

[Liquid A] Vinyl chloride/vinyl acetate/vinyl alcohol copolymer (trade name: VAG); manufactured by Union Carbide Co., Ltd.) 10 parts Incyanate (trade name: Coronatom; manufactured by Nippon Polyurethane Industries, Ltd.) 5 parts Amino-modified silicone (trade name) SF-8417; manufactured by Toshi Silicone Co., Ltd.) 0.5 parts Epoxy-modified silicone (trade name SF-8411; manufactured by Toshi Silicone Co., Ltd.) 0.4 parts Toluene 40 parts Methyl ethyl ketone 40 parts Next, [Liquid A] was mixed with a wire bar. Synthetic paper (trade name: Yubo FP) with a thickness of approximately 150μ
G-150, manufactured by Tamago Yuka Synthetic Paper Co., Ltd.) and dried for 1 minute at a drying temperature of 75°C to form a dye-receiving layer with a thickness of about 5 μm, and then stored at 80°C for 3 hours. This was cured to produce image receiving media for Example 2.4 of the present invention and Comparative Example 2.4.

[Liquid B] Polyester resin (Toyobo) Pylon 200 15 parts Toluene 40 parts Methyl ethyl ketone 40 parts Using Liquid B, image receptors for Example 1.3 and Comparative Example 1.3 were prepared in the same manner as Liquid A.

Next, using the transfer body and the image receptor of Example 1.3 and Comparative Example 1.3, an applied power of 442 mW/dat, a thermal head Bdot/am partial glaze, and an applied energy LlO
As a result of printing under the conditions of ij/dot, in Example 1.3, no fusion occurred between the ink layer and the image-receiving layer. However, in Comparative Example 1.3, a slight amount occurred.

In addition, as a result of recording Example 1.4 and Comparative Example 1.4 under the above energy conditions and at a speed ratio of n-7 between the image receptor and the recording medium,
In Example 2.4, there was no running failure due to fusion between the ink layer and the image-receiving layer, and no thermal transfer of the ink layer occurred, but in Comparative Example 2.
In No. 4, some thermal transfer of the ink layer occurred.

Next, each ink layer was stored in a constant temperature bath for 60 inches and 100 hours, and then recorded, and the results of evaluating the background stain in the non-heated area are shown in the table below.

images can be formed.

Claims (1)

[Claims] In a sublimation thermal transfer material having an ink layer on a substrate in which a sublimable dye is dispersed in a binder, the ink layer contains polydimethylsiloxane having a functional group that reacts with the binder at only one end of the molecule. A sublimation type thermal transfer material characterized by containing.