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US 8,557,894 B2Granted
Water-triggered coloring or color changing indicator
AssigneeKimberly-Clark Worldwide, Inc.
InventorsJunMo Gil, Xuedong Song
Life of this patent
Estimating the term…
Abstract
An ink formulation that includes a reversible color-developing complex formed from a dye precursor molecule having a triarylmethane derivative structure modified with a leaving-group (L) that disassociates from said dye precursor when subjected to environmental conditions of either a neutral or acidic pH value is described. Also the invention pertains to diagnostic indicators or absorbent personal care products that have the ink formulation applied to at least a part of the product.
Claims25
An ink formulation comprising:
- a) about 0.1 to about 12% wt./wt. of a reversible color-developing complex formed from a dye precursor molecule having a triarylmethane derivative structure (1),
- modified with a leaving-group (L) that disassociates from said dye precursor when subjected to environmental conditions of either a neutral or acidic pH value;
- b) about 3% to about 50% wt./wt. polymeric binder;
- c) and about 1% to about 21% wt./wt. of a alkaline pH regulator, all in either a polar or non-polar solvent.
1 more element
Dependencies are inferred from the claim text.