| abstract |
The invention relates to a compound of the formula (I) Ar(NHSO 2 Ar 1 )l(SO 2 NHAr 1 ) m (NHC(O)NHAr 2 ) n (I), wherein l and m independently of one another are 0, 1, 2, 3, and/or 4 and the sum of l+m is equal to or more than 1, n is 2, 3, 4, or 5, Ar is a benzol group which is substituted (l+m+n) times, Ar 1 is an unsubstituted or substituted aromatic group, and Ar 2 is an unsubstituted or substituted phenyl group or a benzoyl group. The invention also relates to a heat-sensitive recording material comprising a carrier substrate and a heat-sensitive color-forming layer which contains at least one color former and at least said color developer. |