Patent ID: 7144535
Filing Date: 2006-12-05
Classification: C08G,D06N

Abstract:
1. A method for producing a micro-porous, compact material with high durability performance comprising: impregnating a non-woven felt with a polyurethane including soft segments and hard segments during a dilution step, the polyurethane resistant to treatment at temperatures above about 250° C., wherein the soft segments consists of at least one polycarbonate-polyol selected from the group consisting of polypentamethylenecarbonatoglycol, polyhexamethylenecarbonatoglycol and polyheptamethylenecarbonatoglycol and at least one polyester-polyol selected from the group consisting of: polyhexamethyleneadipateglycol, polyneopentyladipateglycol, and polycaprolactonediol, and the hard segments comprise ureic groups derived from a reaction between free isocyanate groups and water, thereby forming an extension agent during the reaction.