Patent ID: 7834105
Filing Date: 2010-11-16
Classification: C08L

Abstract:
1. A curable composition comprising: a polythioether; and a polybasic acid-based polyepoxy, wherein the polythioether is formed by the process of: reacting a first polythiol with a compound comprising one epoxy group and a second group, other than an epoxy group, which is reactive with a thiol group to form a first prepolymer, wherein the polythiol preferentially reacts with the second group; reacting the first prepolymer and a second polythiol with the epoxy group to form a second prepolymer; and reacting the second prepolymer and a third polythiol with a polyvinyl ether, and wherein the polythioether is chosen from a compound of Formula 1: wherein wherein —[—(CH wherein each R each R each R each R n is an integer chosen to yield a number average molecular weight for the polythioether polymer ranging from 500 to 20,000 Daltons, wherein the weight ratio of the segment of Formula 2(a) to the segment of Formula 2(b) ranges from 2:1 to 3:1.