Patent ID: 8062993
Filing Date: 2011-11-22
Classification: B41M

Abstract:
1. A thermal recording material comprising a support and a heat-coloring layer containing a sensitizer which is at least one member selected from the group consisting of benzyl p-benzyloxybenzoate, di-p-methylbenzyl oxalate, 2-naphthylbenzyl ether, p-benzylbiphenyl, 4-biphenyl-p-tolyl ether, 1,2-di(3-methylphenoxy)ethane, 1,2-bis(phenoxymethyl)benzene and stearic acid amide formed thereon, which layer comprises a colorless or pale basic dye and a developer mixture for a thermal recording material as main components, which developer mixture comprises a mixture of a first organic developer which is a condensed composition mainly comprising a condensate represented by the formula (I): wherein R is a tert-butyl group, X and Y are each a hydrogen atom, and n=0 (2 core condensate), and further comprising at least one kind of condensate selected from condensates of the formula (I) wherein n=1-5 (3-7 core condensates), and a second organic developer other than the first organic developer which is not 2,2-bis(3-methyl-4-hydroxyphenyl)propane, wherein the second organic developer is at least one member selected from the group consisting of 4-hydroxy-4′-isopropoxydiphenylsulfone; 4-hydroxy-4′-propoxydiphenylsulfone; benzyl p-hydroxybenzoate; bis(3-allyl-4-hydroxyphenyl)sulfone; a composition comprising 2,2′-bis[4-(4-hydroxyphenylsulfone)phenoxy]diphenylether; 2,4-bisphenolsulfone; and 4,4-bisphenolsulfone, the content of the condensate of the formula (I) wherein n=0 (2 core condensate) in the condensed composition, which is the first organic developer, is 40-90%, and the first and the second organic developers are mixed at a mixing ratio (the first organic developer: the second organic developer) of 99.9:0.1-70:30 (weight ratio).