Abstract: The invention relates to a color developer of formula (I), (Ar1—SO2—NH—)m-Y—(—NH—C(O)—NH—SO2—Ar2)n (I), wherein Ar1 is an unsubstituted or substituted aromatic moiety, Ar2 is an unsubstituted or substituted phenyl moiety, Y is at least an (m+n)-times substituted benzene group or naphthalene group, and Y is substituted in such a way that at least one Ar2—SO2—NH—C(O)—NH group is in ortho-position with respect to at least one Ar1—SO2—NH group. The invention further 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 one phenol-free color developer, the at least one color developer being the compound of formula (I). The invention further relates to a method for producing said heat-sensitive recording material.

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: Described are colour developers of formula (I) Ar1—NH—CO—NH—C6H4—SO2—O—C6H4—NH—CO—NH—Ar2 ??(I), a heat-sensitive recording material comprising a carrier substrate and also a heat-sensitive, colour-forming layer containing 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), and a method for producing this heat-sensitive recording material.

Abstract: The present invention relates to an N-(4-((4-(3-phenylureido)phenyl)sulfonyl)phenyl)benzenesulfonamide in the polymorphic form ?18.9, characterised by an x-ray powder diffractogram having the Bragg angles (2?/CuK?) 10.9, 11.7, 14.6, 15.0, 15.8, 16.6, 17.6, 18.9, 19.4, 20.9, 21.2, 22.0, 23.3, 24.4, 24.7, 26.1, 27.4, 29.4, 34.2, or in the polymorphic form ?21.2, characterised by an x-ray powder diffractogram having the Bragg angles (2?/CuK?) 8.7, 9.8, 10.8, 13.2, 13.9, 14.9, 15.2, 16.0, 17.4, 17.7, 18.7, 20.4, 21.2, 21.6, 22.3, 23.0, 23.3, 23.9, 24.4, 25.0, 25.8, 26.6, 28.1, 28.9, 29.4, 30.1, 30.6, 31.8, 34.5, 35.3, 35.6, 36.9, a method for production thereof, use thereof as a colour developer in a heat-sensitive recording material, and a heat-sensitive recording material comprising N-(4-((4-(3-phenylureido)phenyl)sulfonyl)phenyl)benzenesulfonamide in the polymorphic form ?18.9 or in the polymorphic form ?21.2.

Abstract: The present invention relates to an N-(4-((4-(3-phenylureido)phenyl)sulfonyl)phenyl)benzenesulfonamide in the polymorphic form ?18.9, characterised by an x-ray powder diffractogram having the Bragg angles (2?/CuK?) 10.9, 11.7, 14.6, 15.0, 15.8, 16.6, 17.6, 18.9, 19.4, 20.9, 21.2, 22.0, 23.3, 24.4, 24.7, 26.1, 27.4, 29.4, 34.2, or in the polymorphic form ?21.2, characterised by an x-ray powder diffractogram having the Bragg angles (2?/CuK?) 8.7, 9.8, 10.8, 13.2, 13.9, 14.9, 15.2, 16.0, 17.4, 17.7, 18.7, 20.4, 21.2, 21.6, 22.3, 23.0, 23.3, 23.9, 24.4, 25.0, 25.8, 26.6, 28.1, 28.9, 29.4, 30.1, 30.6, 31.8, 34.5, 35.3, 35.6, 36.9, a method for production thereof, use thereof as a colour developer in a heat-sensitive recording material, and a heat-sensitive recording material comprising N-(4-((4-(3-phenylureido)phenyl)sulfonyl)phenyl)benzenesulfonamide in the polymorphic form ?18.9 or in the polymorphic form ?21.2.

Abstract: Described are colour developers of formula (I) Ar1—SO2—NH—C6H4—SO2—C6H4—NH—CO—NH—Ar2 (I), a heat-sensitive recording material, comprising a carrier substrate and also a heat-sensitive, colour-forming layer comprising at least one colour former and at least one phenol-free colour developer, the at least one colour developer being the compound of formula (I), and a method for producing this heat-sensitive recording material.

Abstract: Described are colour developers of formula (I) Ar1—SO2—NH—C6H4—SO2—C6H4—NH—CO—NH—Ar2 (I), a heat-sensitive recording material, comprising a carrier substrate and also a heat-sensitive, colour-forming layer comprising at least one colour former and at least one phenol-free colour developer, the at least one colour developer being the compound of formula (I), and a method for producing this heat-sensitive recording material.

Abstract: The invention relates to a compound of the formula (I) Ar(NHSO2Ar1)l(SO2NHAr1)m(NHC(O)NHAr2)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, 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.

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 color developer of formula (I), (Ar1—SO2—NH-)m-Y—(—NH—C(O)—NH—SO2—Ar2)n (I), wherein Ar1 is an unsubstituted or substituted aromatic moiety, Ar2 is an unsubstituted or substituted phenyl moiety, Y is at least an (m+n)-times substituted benzene group or naphthalene group, and Y is substituted in such a way that at least one Ar2—SO2—NH—C(O)—NH group is in ortho-position with respect to at least one Ar1—SO2—NH group. The invention further 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 one phenol-free color developer, the at least one color developer being the compound of formula (I). The invention further relates to a method for producing said heat-sensitive recording material.

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.