Patent ID: 9434199
Filing Date: 2016-09-06
CPC Classification: B41M,C07C

Claim Text:
1. A thermal recording material comprising: a support and a coloring layer containing a colorless or pale colored dye precursor and a developer provided thereon, wherein the developer contains 2,4′-dihydroxydiphenylsulfone and 4,4′-dihydroxydiphenylsulfone, and a weight ratio of the 2,4′-dihydroxydiphenylsulfone and the 4,4′-dihydroxydiphenylsulfone is within a range of exceeding 50/50 and 95/5 or less, wherein the 2,4′-dihydroxydiphenylsulfone and the 4,4′-dihydroxydiphenylsulfone comprises 2,4′-dihydroxydiphenylsulfone and 4,4′-dihydroxydiphenylsulfone obtained by sequentially undergoing: