Papierfabrik August Koehler Se

Koehler Innovation & Technology Gmbh

Koehler Paper Se

Timo Stalling

Michael Horn

Kerstin Zieringer

Maren Steppat

Christian Schnick

Described are colour developers of formula (I)Ar—NH—CO—NH—CH—SO—O—CH—NH—CO—NH—Ar  (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.

Heat-sensitive recording material

The invention relates to a color developer of formula (I), (Ar—SO—NH—)m-Y—(—NH—C(O)—NH—SO—Ar)n (I), wherein Aris an unsubstituted or substituted aromatic moiety, Aris 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 Ar—SO—NH—C(O)—NH group is in ortho-position with respect to at least one Ar—SO—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.

Non-phenolic color developer and heat-sensitive recording material

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&#x2014;CO&#x2014;NH&#x2014;CO&#x2014;NH&#x2014;Ar)(A), wherein Ar is an unsubstituted or substituted phenyl or naphthyl group, Aris an unsubstituted or substituted phenyl, naphthyl, pyridyl, thiazolyl or benzothiazolyl group, and n is 1 or 2.

The present invention relates to an N-(4-((4-(3-phenylureido)phenyl)sulfonyl)phenyl)benzenesulfonamide in the polymorphic form &#x3c9;, characterised by an x-ray powder diffractogram having the Bragg angles (2&#x3b8;/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 &#x3b1;, characterised by an x-ray powder diffractogram having the Bragg angles (2&#x3b8;/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 &#x3c9;or in the polymorphic form &#x3b1;.

Polymorphic forms of N-(4-((4-(3-phenylureido)phenyl)sulfonyl)phenyl)benzolsulfonamide

Described are colour developers of formula (I) Ar&#x2014;SO&#x2014;NH&#x2014;CH&#x2014;SO&#x2014;CH&#x2014;NH&#x2014;CO&#x2014;NH&#x2014;Ar(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.

The invention relates to a compound of the formula (I) Ar(NHSOAr)l(SONHAr)(NHC(O)NHAr)(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, Aris an unsubstituted or substituted aromatic group, and Aris 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.

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Appenweier, Germany

Timo Stalling