申请人:PAPIERFABRIK AUGUST KOEHLER SE
公开号:US20210071025A1
公开(公告)日:2021-03-11
The invention relates to 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, characterised in that the at least one colour developer is the compound of formula (A), Ar(NH—CO—NH—CO—NH—Ar
1
)
n
(A), wherein Ar is an unsubstituted or substituted phenyl or naphthyl group, Ar
1
is an unsubstituted or substituted phenyl, naphthyl, pyridyl, thiazolyl or benzothiazolyl group, and n is 1 or 2.