Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1991-01-31
1993-01-12
Bell, Mark L.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
503217, 503225, C09D 1100, B41M 530
Patent
active
051786699
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a composition for image forming materials and, more particularly, to a composition for reversible thermal recording media that form or erase images depending upon the difference in thermal energy.
BACKGROUND ART
Various reversible image forming materials have hitherto been disclosed in many references including Unexamined Published Japanese Patent Application Nos. 191190/1983, 193691/1985, U.S. Pat. No. 3,666,525, Unexamined Published Japanese Patent Application Nos. 119377/1979, 39377/1988, 41186/1988, U.S. Pat. No. 4,028,118, and Unexamined Published Japanese Patent Application Nos. 81157/1975 and 105555/1975.
Among the methods disclosed in these references, those which are disclosed in U.S. Pat. No. 4,028,118, as well as Unexamined Published Japanese Patent Application Nos. 81157/1975 and 105555/1975 have had the disadvantage that the image formed will vary with temperature and hence is unsatisfactory in terms of memory quality. The image forming materials described in Unexamined Published Japanese Patent Application Nos. 191190/1983, 193691/1985, and U.S. Pat. No. 3,666,525 comprise a recording layer composed of a color former, a color developer and a binder, with a low vapor-pressure solvent or a heat-fusible material added as required. In those image-forming materials, color is formed using thermal energy and erased with the aid of water, water vapor or a certain kind of organic solvent and, hence, the mechanism involved differs from the one which accomplishes cyclic color formation and erasure solely by controlling thermal energy.
The image forming materials described in Unexamined Published Japanese Patent Application Nos. 119377/1979, 39377/1988 and 41186/1988 have a heat-sensitive layer that is chiefly composed of a resin matrix and an organic low-molecular weight material dispersed in said resin matrix. The recording method they adopt depends on the control of thermal energy, which causes reversible changes in the transparency of the heat-sensitive layer to form and erase images. This is not a method of forming and erasing images by chemical color formation and erasure.
As described above, there has been no prior art system that is capable of chemical color formation and erasure solely by controlling thermal energy and which has already been practiced commercially.
An object, therefore, of the present invention is to provide a reversible thermal recording medium that has not been proposed in the prior art and which has memory quality in that it is capable of chemically forming or erasing color solely by controlling thermal energy, as well as a composition suitable for use in that medium.
DISCLOSURE OF THE INVENTION
The present inventors conducted intensive studies under the circumstances described above and found that the aforementioned object of the invention could be attained by providing a composition for reversible thermal recording media that contained an amphoteric compound having at least one of a phenolic hydroxyl group and a carboxyl group and also having an amino group either as a functional group or as part of a salt compound, and a leuco compound, particularly in the case where said amphoteric compound was a compound that had at least one of a phenolic hydroxyl group and a carboxyl group and an amino group and which is represented by the following general formula (1), or a salt or a complex salt of a compound having at least one phenolic hydroxyl group and/or a carboxyl group with an aliphatic amine: ##STR1## (where X is a hydroxyl group or a carboxyl group, and R is a hydrogen atom or a hydroxyl group).
Preferred examples of the amphoteric compound to be used in the present invention which has at least one of a phenolic hydroxyl group and a carboxyl group and which also has an amino group either as a functional group or as part of a salt compound include a compound that has at least one of a phenolic hydroxyl group and a carboxyl group and an amino group and which is represented by the general formula (1) shown above, and a salt or a
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Hino Yoshihiro
Shimizu Toyoko
Watanabe Niro
Bell Mark L.
Klemanski Helene
Toppan Printing Co. Ltd.
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