Hot melt method for the preparation of a chemically cross-linked polyurethane film

• Main Authors: HANSEN, SVEN, WEILAND, KIRSTIN, VON POSSEL, ESTHER, SCHÜMANN, UWE
• Format: Patent
• Language: English; Polish
• Published: 30.11.2012
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS AS ADHESIVES

Producing a chemically cross-linked polyurethane film, comprises (a) chemically reacting a mixture comprising many polyols with one or more polyisocyanates, where at least one of the polyols or at least one of the polyisocyanates contains tri- or higher functional molecules, to hydroxyl-functionalized polyurethane-hotmelt-prepolymer, (b) introducing the polyurethane-hotmelt-prepolymer and one or more polyisocyanates in a continuously operating mixer for chemical reaction and (c) coating the melt on a tapered sheet-like material or between two tapered sheet-like material. Producing a chemically cross-linked polyurethane film, comprises (a) chemically reacting a mixture comprising many polyols with one or more polyisocyanates, where at least one of the polyols or at least one of the polyisocyanates contains tri- or higher functional molecules and the ratio of the total number of the isocyanate groups to the total number of the hydroxyl groups is less than 1, to a hydroxyl-functionalized, meltable reaction product, also called hydroxyl-functionalized polyurethane-hotmelt-prepolymer, (b) introducing the polyurethane-hotmelt-prepolymer and one or more polyisocyanates in a continuously operating mixer for chemical reaction and (c) coating the melt on a tapered sheet-like material or between two tapered sheet-like material.