Patent ID: 7153628

Claim:
A color-developing agent resin composition comprising: Component 1: a phenolic resin comprising formula I wherein n is an integer from 1 to 100; and Component 2: a blend of graft copolymers of a phenolic resin and a multivalent metal salt polymer of a substituted aryl carboxylic acid, wherein at least a portion of said graft copolymers comprise formulas II and III wherein R is C 1 –C 4 linear alkyl, hydroxy or halogen; R 1 is individually C 1 –C 12 linear or branched alkyl, C 1 –C 12 halohydrocarbyl, C 6 –C 12 aryl, C 7 –C 12 aralkyl; n 1 =1–2 M is a multivalent metal ion; a represents the valence of M; and R 2 is wherein n 2 is an integer from 1–100; n 3 is an integer from 1–100; and n 4 is an integer from 1–100.