Patent ID: 7494537

Claim:
A thermochromic coloring color-memory composition comprising a homogeneous solubilized mixture of (A) an electron donative coloring organic compound, (B) an electron accepting compound and (C) a compound represented by the following formula (I) or the following formula (II) as a reaction medium which controls color reactions of the components (A) and (B): wherein, R represents an alkyl group or alkenyl group, having 8 or more carbon atoms, m and n each represents an integer of from 1 to 3, X and Y each represents a hydrogen atom, C 1-4 alkyl group, C 1-4 alkoxy group or halogen: wherein, R 1 represents a hydrogen atom or methyl group, m represents an integer of from 0 to 2, either one of X 1 and X 2 represents —(CH 2 ) n OCOR 2 or —(CH 2 ) n COOR 2 and the other one represents a hydrogen atom, n represents an integer of from 0 to 2, R 2 represents an alkyl or alkenyl group, having 4 or more carbon atoms, Y 1 and Y 2 each represents a hydrogen atom, C 1-4 alkyl group, methoxy group or halogen, r and p each represents an integer of from 1 to 3, with the proviso that a compound represented by the following formula (III) is excluded from the component (C): wherein R 3 represents an alkyl or alkenyl group, having 4 or more carbon atoms.