Reversible thermochromic composition

摘要

The light-fastness of reversible thermochromic compositions is improved by using as the electron accepting compound a bis(hydroxyphenyl)alkane of the general formula I <CHEM> in which CnH2n+1 is a straight chain or branched alkyl group and n is an integer from 5 to 17; each of x and y is a straight chain or branched alkyl group having 1 to 4 carbon atoms, or a halogen atom; and each of p and m is 0 or an integer from 1 to 3.