Patent ID: 6610811
Filing Date: 2003-08-26
Classification: C08G,C09K

Abstract:
A polyurethane which is a reaction product consisting of the following components:A) a polyol component, wherein the polyol component consists of from about 50 to about 90% by weight of at least one subcomponent selected from the group consisting of dimer diols, trimer triols, and OH-terminated polyesters, said OH-terminated polyesters consisting of polycarboxylic acid units and diol units, wherein the polycarboxylic acid units are dimer or trimer fatty acid units, and the balance of the weight of the polyol component consisting of at least one compound selected from the group consisting of polyethers, polyesters, and oleochemical polyols; and B) an isocyanate component, said isocyanate component consisting of a polyurethane prepolymer which is the reaction product of a polyfunctional isocyanate and at least one compound selected from the group consisting of dimer diols, trimer triols, polyethers containing dimer diol units, and OH-terminated polyesters, said OH-terminated polyesters consisting of polycarboxylic acid units and diol units; wherein the ratio of isocyanate groups in B) to hydroxyl groups in A) is from about 0.95:1 to about 1.05:1; and wherein the tear propagation resistance of the polyurethane is greater than 10 Nmmâˆ’1.