Papierfabrik August Koehler Se

Koehler Innovation & Technology Gmbh

Koehler Paper Se

Maren Steppat

Michael Horn

Timo Stalling

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.

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Oberkirch, Germany

Maren Steppat