Thermal printing medium and method for preparing the same
AssigneeTomoegawa Paper Co., Ltd.
InventorsMitsuhiro Yoshida, Tatsuhiro Yamaguchi, Takayuki Norizuki
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Abstract
A thermal printing medium comprising a substrate having an upper and lower surface; a heat sensitive layer formed over at least one surface of said substrate and including at least one of a colorless and a lightly colored leuco dye, and a color developing agent which imparts color to said leuco dye; and a protective layer comprised of aqueous resin and filler agent as main components thereof; characterized in that said heat sensitive layer is comprising at least one compound indicated by formula (1) ##STR1## (wherein R indicates an alkyl group having 1 to 10 carbon atoms or a benzyl group which may have a substitutional group) as a color developing agent, and aluminum hydroxide.
Claims6
A thermal printing medium comprising
- a substrate having an upper and lower surface;
- a heat sensitive layer formed over at least one surface of said substrate and including at least one of a colorless and a lightly colored leuco dye, and a color developing agent which imparts color to said leuco dye;
- and
- a protective layer comprised of aqueous resin and filler agent as main components thereof;
- characterized in that said heat sensitive layer is comprising at least one compound indicated by formula (1) ##STR5## wherein R indicates an alkyl group having 1 to 10 carbon atoms or a benzyl group which may have a substitutional group, as a color developing agent, and aluminum hydroxide.
A method for preparing a thermal printing medium comprising the steps of:
- forming a heat sensitive layer over at least one surface of said substrate, said heat sensitive layer including at least one of a colorless and a lightly colored leuco dye, and a color developing agent which imparts color to said leuco dye;
- forming a protective layer over said heat sensitive layer, which is comprised of an aqueous resin and a filler agent;
- characterized in that in forming a heat sensitive layer, a coating for forming the heat sensitive layer is prepared by blending a dispersed solution ground using a wet grinding machine, said dispersed solution comprising at least one compound indicated by formula (1) ##STR6## wherein R indicates an alkyl group having 1 to 10 carbon atoms or a benzyl group which may have a substitutional group, as a color developing agent, aluminum hydroxide, and a dispersant.
Dependencies are inferred from the claim text.