US 11,926,168 B2
Non-phenolic color developer and heat-sensitive recording material
Michael Horn, Offenburg (DE); Timo Stalling, Appenweier (DE); and Maren Steppat, Oberkirch (DE)
Assigned to PAPIERFABRIK AUGUST KOEHLER SE, Oberkirch (DE)
Appl. No. 16/615,439
Filed by Papierfabrik August Koehler SE, Oberkirch (DE)
PCT Filed May 17, 2018, PCT No. PCT/EP2018/062909
§ 371(c)(1), (2) Date Nov. 21, 2019,
PCT Pub. No. WO2018/215287, PCT Pub. Date Nov. 29, 2018.
Claims priority of application No. 10 2017 111 439.4 (DE), filed on May 24, 2017.
Prior Publication US 2020/0172477 A1, Jun. 4, 2020
Int. Cl. B41M 5/333 (2006.01); B41M 5/327 (2006.01); B41M 5/337 (2006.01); C07C 311/60 (2006.01)
CPC B41M 5/3333 (2013.01) [B41M 5/3375 (2013.01); C07C 311/60 (2013.01); B41M 5/3275 (2013.01)] 10 Claims
 
1. A heat-sensitive recording material, comprising a carrier substrate and a heat-sensitive colour-forming layer, which contains at least one colour former and at least one phenol-free colour developer, wherein the at least one colour developer is the compound of formula (I):
(Ar1—SO2—NH—)m—Y—(—NH—C(O)—NH—SO2—Ar2)n  (I),
wherein Y is at least one benzene group substituted (m+n) times, and Y is substituted in such a way that at least one Ar2—SO2—NH—C(O)—NH group is in the ortho position with respect to at least one Ar1—SO2—NH group, wherein Ar2 is an unsubstituted phenyl group or a monosubstituted phenyl group and, wherein Ar1 is an unsubstituted, substituted or monosubstituted phenyl group, or an unsubstituted or substituted 2-naphthy group, which is substituted with a C1-C5 alkyl, an alkenyl, an alkynyl, a benzyl, an RO, a halogen, a formyl, an ROC, an RO2C, a CN, an NO2, an R—SO2O, an RO—SO2, an R—NH—SO2, an R—SO2—NH, an R—NH—CO—NH, an R—SO2—NH—CO—NH, an R—NH—CO—NH—SO2 or an R—CO—NH group, wherein R is a C1-C5 alkyl, an alkenyl, an alkynyl, a phenyl, a tolyl or a benzyl group.