Hotmelt process for producing a chemically crosslinked...

Details Hotmelt process for producing a chemically crosslinked... Hotmelt process for producing a chemically crosslinked...

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01) C08G 18/12 (2006.01) C08G 18/22 (2006.01) C08L 75/04 (2006.01) C09J 7/02 (2006.01)

Patent

CA 2663310

Process for producing a chemically crosslinked polyurethane film, comprising the following substeps: A) chemically reacting a mixture comprising two or more polyols with one or more polyisocyanates, at least one of the polyols or at least one of the polyisocyanates comprising molecules having a functionality of three or more, and the ratio of the total number of isocyanate groups to the total number of hydroxyl groups being less than 1.0, to give a hydroxyl-functionalized, meltable reaction product, referred to below as hydroxyl-functionalized polyurethane hotmelt prepolymer, B) introducing the polyurethane hotmelt prepolymer and one or more polyisocyanates into a continuously operating mixing assembly wherein a chemical reaction takes place of the hydroxyl-functionalized polyurethane hotmelt prepolymer in the melt with the polyisocyanates, C) coating the melt emerging from the mixing assembly onto an incoming web- form material or between two incoming web-form materials, in the course of which the reaction started in substep B) continues.

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