Patent ID: 9079444
Filing Date: 2015-07-14
Classification: B41M

Abstract:
1. A method for producing a heat-sensitive recording material with a substrate having a front side and a back side located opposite to the front side, with a heat-sensitive recording layer disposed on the front side of the substrate and containing color formers and color acceptors, with a protective layer covering the heat-sensitive recording layer, and with a coating arranged on the back side of the substrate, the method comprising at least the following steps: preparing a first coating composition, wherein the first coating composition comprises: a color former and as color acceptor at least 85% by weight of 4,4′-dihydroxydiphenyl sulfone based on the total percentage of color acceptors in the first coating composition, at least one sensitizer selected from the group comprising methylolstearamide, stearic acid amide, and dimethyl terephthalate; preparing a second coating composition, wherein the second coating composition comprises: from 65 to 95% by weight of one or more (meth)acrylates selected from the group comprising polyether (meth)acrylate, epoxy (meth)acrylate and urethane (meth)acrylate, from 0 to 20% by weight of photoinitiators and from 0.5 to 20% by weight of wax, wherein the indicated weight percent add up to from 65.5 to 100% by weight of the second coating composition; continuously supplying the web-shaped substrate; applying the prepared first coating composition to form the heat-sensitive recording layer arranged on the front side of the substrate; drying the first coating composition; applying the prepared second coating composition to form the protective layer covering the heat-sensitive recording layer; crosslinking the protective layer covering the heat-sensitive recording layer by high-energy radiation; applying the prepared second coating composition to form the coating arranged on the back side of the substrate; and crosslinking the coating arranged on the back side of the substrate by high-energy radiation.