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US 5,178,669 AGranted
Composition for reversible thermal recording media
AssigneeToppan Printing Co., Ltd.
InventorsNiro Watanabe, Toyoko Shimizu, Yoshihiro Hino
Life of this patent
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Abstract
A composition for reversible thermal recording media which contains 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.
Claims15
A composition for reversible thermal recording media which contains an amphoteric compound having at least one of a phenolic hydroxyl group and a phenolic carboxyl group and also having an NH.sub.2 group either as a functional group or as part of a salt compound, and a leuco compound.
Dependencies are inferred from the claim text.