Patent ID: 6579662
Filing Date: 2003-06-17
Classification: B41C,B41M,Y10S

Abstract:
A heat-sensitive composition comprising:a) a hydrophilic heat-sensitive charged ionomer, b) water or a water-miscible organic solvent, and c) an infrared radiation sensitive negatively-charged oxonol dye (IR dye) that has a &lgr;max greater than 700 nm as measured in water or a water-miscible organic solvent, said IR dye being represented by the following Structure I: wherein Râ€² is a substituted or unsubstituted alkyl group, substituted or unsubstituted cycloalkyl group, or substituted or unsubstituted heterocyclic group, or a substituted or unsubstituted carbocyclic aromatic group, Râ€²1 and Râ€²2 are independently substituted or unsubstituted heterocyclic or carbocyclic aromatic groups, and M+ is a monovalent cation.