Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Identified organic electron acceptor other than phenolic resin
Patent
1997-04-30
2000-04-11
Yoon, Tae
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Identified organic electron acceptor other than phenolic resin
503200, 503227, 428480, B41M 5124, B32B 2706, B32B 2736
Patent
active
060488220
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a polyester resin suitably used as a dyeable resin of a dyeable layer of a sublimation transfer image receiver used in combination with a heat transfer sheet containing a sublimation dye, and a sublimation transfer image receiver having a dyeable layer comprising a dyeable resin containing said polyester dyeable resin as a main component.
BACKGROUND ART
A sublimation heat transfer method forms printed images by heating a heat transfer sheet applied with a sublimation dye by a thermal head and the like, thereby transferring the sublimation dye onto a sublimation transfer image receiver which comes in contact with the heat transfer sheet.
The dyeable resin to be used for the dyeable layer of said sublimation transfer image receiver has been conventionally one mainly containing a saturated polyester, as disclosed in, for example, Japanese Patent Unexamined Publication Nos. 107885/1982, 64899/1985, 258790/1986 and 105679/1987.
While a sublimation transfer image receiver using a saturated polyester as the dyeable resin can provide high quality images superior in gradation and color reproduction, it is becoming insufficient in dye sensitivity due to the acceleration of the printing speed of a printer. Then, the dyeing sensitivity of the image receiver has been improved by adding various plasticizers and/or additives to a saturated polyester resin. However, plasticizers and additives have poor compatibility with polyester resins, and particularly when a printed image receiver is preserved for an extended period of time, the printed images tend to become blurred or plasticizers and additives precipitate on the surface of the image receiver with the lapse of time.
While the dyeing sensitivity has been improved by lowering the glass transition temperature of a polyester through modification of the resin skeleton, this method exerts adverse influence on heat resistance, thus resulting in blurred images or changes in the color of dye after dyeing.
An object of the present invention is to overcome such conventional defects and provide a polyester resin suitable as a dyeable resin for a sublimation transfer image receiver, which can make images highly sensitive without using a plasticizer or additive.
Another object of the present invention is to provide a sublimation transfer image receiver containing the above-mentioned dyeable resin.
DISCLOSURE OF THE INVENTION
With the aim of achieving the above-mentioned objects, the present inventors have conducted intensive studies of a dyeable resin which forms a dyeable layer of a sublimation transfer image receiver, and found that when the following polyester resin is used as a dyeable resin which forms a dyeable layer of a sublimation transfer image receiver to be used in a sublimation transfer process, a highly sensitive image can be obtained, which resulted in the completion of the invention.
That is, the present invention provides a polyester resin having a glass transition temperature of not less than 15.degree. C. and a reduced viscosity of 0.15-1.5, which comprises a graft polymer comprising a polyester having an unsaturated bond as a main chain and a radical polymerizable unsaturated monomer as a side chain; and a sublimation transfer image receiver comprising a substrate and a dyeable layer mainly comprising a dyeable resin containing the above-mentioned polyester resin, which is formed on said substrate.
In the present invention, the polyester to be used for the main chain has a weight average molecular weight within the range of 500-200000. The dicarboxylic acid component in the composition of said polyester preferably comprises an aromatic dicarboxylic acid and/or alicyclic dicarboxylic acid in a proportion of 60-100 mol % of the total acid component and the aliphatic dicarboxylic acid in a proportion of 0-40 mol % of the total acid component.
Examples of aromatic dicarboxylic acid include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, orthophthalic acid, naphthalene dicarboxylic acid
REFERENCES:
patent: 3760034 (1973-09-01), Critchfield et al.
patent: 4783375 (1988-11-01), Hashimoto et al.
patent: 4895830 (1990-01-01), Takeda et al.
patent: 5128311 (1992-07-01), Egashira et al.
patent: 5446082 (1995-08-01), Asai et al.
patent: 5656681 (1997-08-01), Shimizu et al.
Araki Yoshio
Asai Haruo
Shimizu Toshiyuki
Toyo Boseki Kabushiki Kaisha
Yoon Tae
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