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US 9,475,328 B2Granted
Developer for thermally responsive record materials
AssigneeValspar Sourcing, Inc.
InventorsJeffrey Niederst, Richard H. Evans, Robert M. O'Brien, Kevin Romagnoli, T. Howard Killilea, Mark S. Von Maier, Lan Deng
Life of this patent
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Abstract
A thermally responsive composition includes a dye and a developer that is free of polyhydric phenols having estrogenic agonist activity greater than or equal to that of bisphenol S. The thermally responsive composition can be used to make BPA-free thermally responsive record materials.
Claims17
A thermally responsive composition comprising a dye and a developer dispersed in a liquid carrier, the developer comprising:
- (i) a polyhydric phenol having two aryl or heteroaryl groups joined through a methylene group and in which each aryl or heteroaryl group includes a hydroxyl group attached to the ring and substituent groups attached to the ring at each ortho position relative to the hydroxyl group;
- and
- wherein the composition is substantially free of diphenols having estrogenic activity greater than or equal to that of bisphenol S.
A method for making a thermal responsive record material comprising:
- (a) providing a substrate;
- (b) applying a thermally responsive composition onto the substrate;
- wherein the thermally responsive composition comprises:
- a dye and a developer dispersed in a liquid carrier, the developer comprising a polyhydric phenol shown in Formula (I):
- wherein:
- H denotes a hydrogen atom, if present;
- each R1 is independently an atom or group having an atomic weight of at least 15 Daltons attached to the phenylene ring at each ortho position relative to the hydroxyl group;
- v is independently 1 to 4;
- w is 4;
- R2 is a divalent methylene group;
- n is 1;
- t is 1;
- and
- the thermally responsive record material is substantially free of polyhydric phenols having estrogenic agonist activity greater than or equal to that of bisphenol S.
11 more elements
Dependencies are inferred from the claim text.