Patent ID: 6284707
Filing Date: 2001-09-04
Classification: B41M

Abstract:
A thermally sensitive recording medium, comprising a substrate and a thermally sensitive color developing layer developing a navy blue or grayish blue color carried on said substrate, said layer comprising a colorless or pale colored dye precursor and a color developer, wherein the dye precursor comprises(a) at least one bluish color developing leuco dye selected from the group consisting of 3,3-bis(p-dimethylaminophenyl)-6-dimethylaminophthalide, 3-(4-dimethylamino-2-ethoxyphenyl)-3-(1-ethyl-2-methylindol-3-yl)-4-azapht halide, and mixture thereof, and(b) at least one black color developing leuco dye having maximum absorption wavelengths of from 420 to 480 nm and from 550 to 640 nm.