The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2024
Filed:
May. 17, 2018
Papierfabrik August Koehler SE, Oberkirch, DE;
PAPIERFABRIK AUGUST KOEHLER SE, Oberkirch, DE;
Abstract
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.