Patent ID: 6187892
Filing Date: 2001-02-13
Classification: C08G,C09J,Y02P,Y10S,Y10T

Abstract:
In a method of producing a coated substrate comprising applying a contact adhesive to a substrate, and allowing the contact adhesive to cure, the improvement wherein said contact adhesive is a polyurethane/urea composition consisting essentially of:a) a polyisocyanate or polyisocyanate adduct having a functionality of less than about 4,b) a polyol blend consisting of1) about 95 to 100% by weight, based on 100% by weight of component b), of at least one polyether polyol having a molecular weight of from about 1800 to 12000 and an average functionality of from about 1.5 to about 4, and2) up to about 5% by weight, based on 100% weight of component b), of at least one chain extender containing hydroxyl groups, having a molecular weight of from about 60 to 400 and an average functionality of from about 1.5 to about 3, andc) at least one polyether having at least two isocyanate-reactive groups, and a molecular weight of from about 1800 to about 12,000, wherein at least 50% of the isocyanate-reactive groups are primary and/or secondary amino groups,wherein the weight ratio of component b) to component c) ranges from about 95:5 to about 0:100, and the amounts of components a), b), and c) are such that the equivalent ratio of isocyanate groups to isocyanate-reactive groups is from about 85:100 to about 115:100 and the sum of the urethane group content plus the urea group content is from about 1 to about 12%.