JP2965591B2 - Sublimation thermal transfer recording method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sublimation-type thermal transfer recording method utilizing diffusion of a sublimation dye by heat.

[Prior Art] Conventionally, an image receiving layer (Receiving Layer) is used in an n-fold mode method.
r, RL) speed V _RL > ink layer (Ink Layer _IL ) speed V _IL
Further, the frictional force due to the speed difference between RL and IL and the softening and melting of RL and IL due to recording (heating) cause fusion during recording between them, resulting in poor running and thermal transfer of the ink layer.

As this improvement method, means for mixing a substance having a releasing property or a lubricating property into RL is used.

However, at the time of image formation (at the time of full color), three or four colors of IL of yellow, magenta, cyan and, if necessary, black are recorded on the RL in the n-times mode.

At this time, as the RL is recorded as one color, two colors, and three colors, for example, a part of the substance having the releasability or activity is transferred to the IL.

 The RL surface is changed from smooth to uneven by thermal recording.

Etc., the lubricity is lower.

As a result, in the case of n-times recording with one color, although the fusing between the RL and the IL, the running failure and the thermal transfer of the ink layer do not occur, the above problem may occur when forming the secondary color and the tertiary color.

[Problems to be Solved by the Invention] The present invention improves the drawbacks of the conventional sublimation type thermal transfer method, that is, fusion between RL and IL in n-times mode recording also in secondary color and tertiary color formation. It is an object of the present invention to provide a sublimation-type thermal transfer method that can prevent running defects and the occurrence of thermal transfer of IL.

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-described problems, and as a result, focused on the dynamic friction coefficient between IL and RL, and set the recording order of the transfer body to a large dynamic friction coefficient of IL. It has been found that the order is effective, leading to the present invention.

That is, in the present invention, the sublimation-type thermal transfer member and the image receiving sheet are overlapped. [Image receiving sheet speed] / [recording medium speed]> 1 or [Image receiving sheet feed speed] / [recording medium feed amount]>
1. A recording method in which thermal printing is performed from the recording medium side while both are running under the conditions of 1, and the dye in the transfer body at that portion is sublimated and transferred to the image receiving sheet with yellow, magenta, cyan, and, if necessary, black. And a sublimation type thermal transfer recording method in which the recording order of the transfer member is such that the dynamic friction coefficient of the transfer member ink layer to the image receiving sheet is large.

In the present invention, the measurement of the dynamic friction coefficient conforms to ASTM D 1984. Specifically, using a surface property tester TYPE: HEIDON-14S / D (manufactured by Shinto Kagaku Co., Ltd.), the unused RL and IL are overlapped and measured. I do.

To specifically explain the present invention, the transfer member used contains a sublimable dye in an organic binder, more preferably contains a substance having lubricity or release property, and further contains an organic binder. As described in Japanese Patent Application No. 62-280434, which satisfies the above requirements, the ink layer may be composed of a dye transfer contributing layer (a layer contributing to image formation) and a dye. Multi-layer type with separate function of two layers, supply layer (layer supplying dye to contributing layer) and Japanese Patent Application No. 62-316979
As described above, a single layer type in which a particulate dye is dispersed is suitable for the n-times mode method for multi-purpose.

The image receiving paper is formed by mixing a resin, such as a polyester resin, which is easily dyed with a sublimable dye and a material having a releasing property or lubricity, such as silicone oil, on a base paper of a rigid paper thread. An image receiving paper in which the layer has been cured by ultraviolet rays or thermally crosslinked can be used.

EXAMPLES The present invention will be described in more detail with reference to the following examples.

Example 1 [Intermediate adhesive layer] Polyvinyl butyral resin 10 parts by weight Coronate L 5 parts by weight Toluene 95 parts by weight Methyl ethyl ketone 95 parts by weight [Yellow ink layer] Polyvinyl butyral resin (Sekisui Chemical) 7 parts by weight Sublimable dye Fron Brill Yellow S- 6GL 16 parts by weight (Sand) Amino-modified silicone oil 2 parts by weight (Toray Silicone) Epoxy-modified silicone oil 2 parts by weight (Toray Silicone) Diisocyanate coronate L 2 parts by weight Toluene 70 parts by weight Methyl ethyl ketone 70 parts by weight After dispersing in a ball mill for 24 hours, a 1.0 μm intermediate adhesive layer was formed on a 6 μm thick aromatic polyamide film having a 1 μm thick silicone resin-based heat-resistant layer formed on the back surface using a wire bar, and a 7.0 μm yellow ink layer was further formed thereon. (The coefficient of kinetic friction is 0.10 at a measurement temperature of 80 ° C)
Was formed.

Similarly, in the yellow ink layer, MS Red
G and Macrolex Red Violet R were changed to a mixing ratio of 2: 1 to form a magenta former (dynamic friction coefficient: 0.13 at a measurement temperature of 80 ° C.) in which the weight part of each silicone oil was 1.4.

Similarly, in the yellow ink layer, sublimation dye
t Change to Blue 714 and add 1 part by weight of silicone oil
Recording medium for cyan (dynamic friction coefficient at 80 ° C measurement temperature)
0.15).

Next, a mixture of the following compositions was sufficiently mixed and dispersed as an image receiving paper to prepare a coating liquid [liquid A] for a dye receiving layer.

[Solution A] Vinyl chloride / vinyl acetate / vinyl alcohol copolymer (trade name: VAGH; manufactured by Union Carbide) 10 parts Isocyanate (trade name: Coronate; manufactured by Nippon Polyurethane Industry Co., Ltd.) 5 parts Amino-modified silicone (trade name: SF-8417) ; Toray Silicone Co., Ltd.) 0.5 parts Epoxy-modified silicone (trade name: SF-8411; Toray Silicone Co., Ltd.) 0.5 parts Toluene 40 parts Methyl ethyl ketone 40 parts
m on synthetic paper (trade name: Yupo FPG-150; manufactured by Oji Yuka Synthetic Paper Co., Ltd.) and dried at a drying temperature of 75 ° C. for 1 minute to form a dye receiving layer having a thickness of about 5 μm. Further, the mixture was stored at 80 ° C. for 3 hours and cured to prepare an image receiving medium of the present invention.

Next, the above ink layers and the image receiving paper are superimposed on each other.
As a result of measuring the dynamic friction coefficient according to 1894, the dynamic friction coefficient is high in the order of yellow, magenta, and cyan.

 Thermal power: 442 mW / dot Thermal head: 6 dots / mm Partial glaze type Speed ratio of the recording medium to the receiving paper: n = 7 Applied energy: 2.21 mJ / dot , Magenta, and yellow.

Comparative Example 1 The recording order was yellow, magenta, and cyan.

As a result, in Example 1, good recording was possible without fusing or running defects.

However, in Comparative Example 1, fusing and running failure occurred during cyan recording, and cyan recording was impossible.

Example 2 <Yellow Ink Layer> [Prescription of First Layer] Polyvinyl butyral resin 7 parts by weight Sublimable dye Fron Brill Yellow S-6GL 30 parts by weight Polyethylene oxide 3 parts by weight Coronate L 2 parts by weight Toluene 95 parts by weight Methyl ethyl ketone 95 parts by weight Parts [Prescription of the second layer] Polyvinyl butyral resin 10 parts by weight Sublimable dye Fron Brill Yellow S-6GL 7 parts by weight Amino-modified silicone oil 1.0 parts by weight Epoxy-modified silicone oil 1.0 parts by weight Coronate L 2 parts by weight Toluene 95 parts by weight methyl ethyl ketone 95 parts by weight The composition having the above formulation was formed on a film having the same intermediate adhesive layer as in Example 1 so as to have a first layer of 3.00 μm and a second layer of 0.84 μm. The coefficient of kinetic friction was 0.15 at 80 ° C.

Similarly, in the yellow ink layer, MS Red
G and Macrolex Red Violet R were changed to a mixing ratio of 2: 1 to form a magenta recording medium in which the weight part of each silicone oil was 1.2. The coefficient of kinetic friction was 0.13 at 80 ° C.

Similarly, in the yellow ink layer, sublimation dye
A recording medium for cyan was formed in which the weight part of each silicone oil was changed to 1.5 in place of tBlue 714. Dynamic friction coefficient is 0 at 80 ° C.
It was 10.

The above recording medium was recorded in the order of yellow, magenta, and cyan under the same image receiving paper and recording conditions as in the example.

However, the dynamic friction coefficient of each sheet is higher in the order of cyan, magenta and yellow.

Comparative Example 2 In Example 2, recording was performed in the order of cyan, magenta, and yellow.

As a result, in Example 2, there was no fusion or running failure, and good recording was possible.

However, in Comparative Example 2, fusing and running failure occurred during yellow recording, and yellow recording was impossible.

[Effects of the Invention] As described above, according to the present invention, in the n-times mode recording, recording is performed in the order of increasing the kinetic friction coefficient of the ink layer, thereby increasing the kinetic friction coefficient of the image receiving layer at the time of forming secondary colors and tertiary colors. Fusion between the image receiving layers, poor running, and thermal transfer of the ink layer can be prevented.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroyuki Uemura 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (56) References JP-A-59-209196 (JP, A) JP-A Sho 58-158291 (JP, A) JP-A-63-227381 (JP, A) JP-A-3-124493 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B41M 5/38 -5/40

Claims (1)

(57) [Claims] An image receiving sheet is superimposed on a sublimation type thermal transfer member under the following condition: [speed of image receiving sheet] / [speed of recording medium]> 1 or [feed amount of image receiving sheet] / [feed amount of recording medium]> 1. In a recording method in which thermal printing is performed from the recording medium side while both of them are running and the dye in the transfer body at that portion is sublimated and transferred to the image receiving sheet, yellow, magenta, cyan, and black if necessary. A sublimation type thermal transfer recording method, wherein the recording order is a descending order of the dynamic friction coefficient of the transfer body ink layer to the image receiving sheet.