Abstract: The invention relates to a heat-sensitive recording material, comprising: a support material in sheet form, a color layer on one side of the support material in sheet form; and a heat-sensitive layer on the color layer, so that the color layer is at least partially covered, the heat-sensitive layer being such that it becomes translucent by local application of heat, so that the underlying color layer becomes visible; and a protective layer on the heat-sensitive layer, the protective layer containing less than 5% by weight of pigments. The invention also relates to its use as a receipt roll, adhesive label (roll), ticket (roll) or as printer paper for mechanical printers or pens.

Abstract: 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—Ar1)n (A), wherein Ar is an unsubstituted or substituted phenyl or naphthyl group, Ar1 is an unsubstituted or substituted phenyl, naphthyl, pyridyl, thiazolyl or benzothiazolyl group, and n is 1 or 2.

Abstract: The invention relates to a compound of the formula (I) Ar(NHSO2Ar1)1(SO2NHAr1)m(NHC(O)NHAr2)n (I), wherein 1 and m independently of one another are 0, 1, 2, 3, and/or 4 and the sum of is equal to or more than 1, n is 2, 3, 4, or 5, Ar is a benzol group which is substituted (i+m+n) times, Ar1 is an unsubstituted or substituted aromatic group, and Ar2 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.