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

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-functionaliz...

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Bibliographische Detailangaben
Hauptverfasser:	HANSEN, SVEN, WEILAND, KIRSTIN, VON POSSEL, ESTHER, SCHUEMANNUWE
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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
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Beschreibung
Zusammenfassung:	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.