Color changing compositions
AssigneeBinney & Smith Inc.
InventorsRichard E. Miller, Charlene R. Couch
Life of this patent
Estimating the term…
Abstract
A multiple coloring composition system is disclosed whose coloring effect is changed upon treatment with a second coloring composition, once the second coloring composition has been deposited over the undercolor coloring composition. The multiple ink system comprises: (a) an undercolor aqueous coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater and/or by a reducing agent; and (b) an overcolor aqueous coloring composition comprising a colorant capable of maintaining its characteristic color in the presence of a pH of about 10 or greater and/or a reducing agent, a base in an amount sufficient to yield a pH of the overcolor composition of about 10 or greater, and/or a reducing agent.
Claims29
A multiple coloring composition system comprising:
- (a) an undercolor aqueous coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater;
- and
- (b) an overcolor aqueous coloring composition comprising a colorant capable of maintaining its characteristic color in the presence of a pH of about 10 or greater and an effective amount of a base sufficient to yield a pH of said overcolor aqueous coloring composition of about 10 or greater.
An ink composition system comprising:
- (a) an undercolor aqueous ink comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater in an amount of from about 0.1% to about 15% by weight of the undercolor ink;
- and
- (b) an overcolor aqueous ink comprising from about 1% to about 20% by weight of said overcolor ink of a reducing agent;
- from about 0.1% to about 10% by weight of said overcolor ink of a base;
- and from about 0.1% to about 15% by weight of said overcolor ink of an overcolor colorant which maintains its characteristic color in the presence of a reducing agent and a pH of about 10 or greater.
A color changing marking system comprising at least an undercolor marking instrument and an overcolor marking instrument, said undercolor marking instrument containing an undercolor ink composition comprising a dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater, and said overcolor writing instrument containing an overcolor ink, said ink comprising (1) from about 0.1% to about 10% by weight of a base;
- and (2) from about 0.1% to about 15% by weight of a colorant which maintains its characteristic color in the presence of a pH of about 10 or greater.
A paint composition system comprising:
- (a) an undercolor aqueous paint comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater;
- and
- (b) an overcolor aqueous paint comprising from about 0.5% to about 5% by weight of a base;
- from about 0.1% to about 12% by weight of an undercolor dye that maintains its characteristic color in the presence of a pH of about 10 or greater;
- and a thickener in an amount of from about 1% to about 10% by weight.
A coloring composition comprising (a) from about 0.1% to about 10% by weight of a base;
- (b) from about 1% to about 20% by weight of a reducing agent;
- and (c) from about 0.1% to about 15% by weight of a colorant which maintains its characteristic color in the presence of both a pH of about 10 or greater and a reducing agent.
A multiple coloring composition system comprising:
- (a) a first undercolor aqueous coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater;
- (b) a second undercolor aqueous coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a reducing agent;
- and
- (c) an overcolor aqueous coloring composition comprising from about 0.1% to about 12% by weight of a colorant capable of maintaining its characteristic color in the presence of a pH of about 10 or greater, an effective amount of a base sufficient to yield a pH of said overcolor aqueous coloring composition of about 10 or greater, and from about 1% to about 20% by weight of a reducing agent.
An ink composition system comprising:
- (a) a first undercolor aqueous ink comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater in an amount of from about 0.1% to about 15% by weight of the undercolor ink;
- (b) a second undercolor aqueous ink comprising an undercolor dye whose coloring ability is destroyed in the presence of a reducing agent;
- and
- (c) an overcolor aqueous ink comprising from about 1% to about 20% by weight of said overcolor ink of a reducing agent;
- from about 0.1% to about 10% by weight of said overcolor ink of a base;
- and from about 0.1% to about 15% by weight of said overcolor ink of an overcolor colorant which maintains its characteristic color in the presence of a reducing agent and a pH of about 10 or greater.
A color changing marking system comprising at least a first undercolor marking instrument and a second undercolor making instrument and at least one overcolor marking instrument, said first undercolor marking instrument containing a first undercolor ink composition comprising a dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater, said second undercolor marking instrument containing a second undercolor ink composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a reducing agent, and said overcolor writing instrument containing an overcolor ink, said overcolor ink comprising (1) from about 0.1% to about 10% by weight of a base;
- and (2) from about 0.1% to about 15% by weight of a colorant which maintains its characteristic color in the presence of a pH of about 10 or greater, and from about 1% to about 20% by weight of a reducing agent and wherein said pH of said overcolor ink is about 10 or greater.
Dependencies are inferred from the claim text.