MATIERE COMPOSITE THERMOSENSIBLE D'ENREGISTREMENT D'UNE IMAGE RESISTANT AUX SOLVANTS

LA MATIERE COMPREND UN SUBSTRAT CELLULOSIQUE 12, UNE COUCHE 14 PRODUCTRICE DE COULEUR (POUVANT PAR IMPRESSION THERMIQUE FORMER UNE IMAGE), FIXEE A UNE PREMIERE SURFACE DU SUBSTRAT 12, COMPRENANT UN LEUCO-DERIVE DE COLORANT DEVELOPPABLE PAR EXPOSITION A UN REVELATEUR ACIDE, UN REVELATEUR ACIDE, UN LIANT DU COLORANT ET DU REVELATEUR, UN AGENT PARTICULAIRE BASIQUE DE NEUTRALISATION, ET UNE COUCHE PROTECTRICE 16, INSOLUBLE DANS L'EAU COMPORTANT UNE RESINE RETICULEE PAR COVALENCE ET CATALYSEE PAR UN ACIDE, ET EVENTUELLEMENT UNE SECONDE COUCHE PROTECTRICE RESINEUSE 20, UNE COUCHE ADHESIVE 22 ET UNE DOUBLURE ANTI-ADHERENCE AMOVIBLE 24. TOUTES CES COUCHES SONT PERMEABLES A L'OXYGENE.APPLICATION: FABRICATION D'ETIQUETTES POUR VIANDES ROUGES ET PRODUITS ALIMENTAIRES DIVERS. Disclosed is a heat-sensitive recording material useful, for example, in the manufacture of labels used in connection with the sale of meat, produce, and the like. The material comprises a cellulosic or other suitable substrate, a thermally imprintable color producing layer and a water-insoluble protective layer over the color-producing layer. It may also include a second protective layer and/or a pressure-sensitive adhesive layer on the opposite side of the substrate from the color-producing layer, and a releasable liner covering the adhesive layer. The color-producing layer has a colorless or pale leuco dye, an acidic developer for producing upon imagewise heating of the recording material, a water-soluble, polymeric binder material, and a basic, acid-neutralizing agent for reducing background discoloration. The protective layer comprises a polymeric resin, a covalent cross-linker for the resin, an acidic substance operative as a catalyst which cross-links the resin in situ, and inert filler particles operative as spacer particles. Oxygen-permeable, heat-sensitive recording material labels made in accordance with the invention avoid the reduction of "meat bloom" when applied to a package containing red meat.