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US 5,348,930 AGranted
Heat sensitive recording material
AssigneeNicca Chemical Co., Ltd.
InventorsNorio Kobayashi, Toshiaki Takahashi, Masahiro Makino, Masaaki Hosoda
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AssigneeNicca Chemical Co., Ltd.
InventorsNorio Kobayashi, Toshiaki Takahashi, Masahiro Makino, Masaaki Hosoda
Estimating the term…
A heat sensitive recording material comprises a heat sensitive color forming layer containing a color former of a colorless or light color leuco dyestuff, a developer which develops color by reaction with the color former upon heating and is a mixture of 97 to 70 weight % of 2,4'-dihydroxydiphenylsulfone and 3 to 30 weight % of 4,4'-dihydroxydiphenylsulfone and a sensitizer. The heat sensitive color forming layer is coated on a support. The heat sensitive recording material has excellent color forming property by which sufficiently high concentration and sensitivity of the color forming are obtained and has excellent stability of the image with time.
A heat sensitive recording material comprising, as a coating on a support, a heat sensitive color forming layer containing a color former of colorless or light color leuco dyestuff, a developer which develops color by reaction with the color former upon heating and is a mixture of 97-70% by weight of 2,4'-dihydroxydiphenylsulfone and 3-30% by weight of 4,4'-dihydroxydiphenylsulfone and at least one sensitizer selected from the group consisting of p-benzyldiphenyl, di(p-methylbenzyl) oxalate, .beta.-benzyl-oxynaphthalene, 1,2-di(methylphenoxy)ethane, m-terphenyl, diphenylsulfone and phenyl 2,4,6-mesitylenesulfonate.
Dependencies are inferred from the claim text.