Patent ID: 6310114
Filing Date: 2001-10-30
Classification: C08G

Abstract:
A process for the formation of non-thermoplastic polyurethane elastomers comprising the steps of:a) forming an isocyanate-terminated prepolymer having from 3.3 to 10% free NCO by reacting a polyhydroxyl compound having a molecular weight of from 800 to 6000 with naphthylene 1,5-diisocyanate (1,5 NDI) and at least one other aromatic diisocyanate selected from the group consisting of: tolylene diisocyanate; diphenylmethane diisocyanate; 3,3'-dimethylbiphenyl diisocyanate; 1,2-diphenylethane diisocyanate; phenylene diisocyanate; hexamethylene 1,6-diisocyanate; and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane; wherein the equivalence ratios of OH:NCO of the other aromatic diisocyanate:NCO of 1,5 NDI is from 1:(>1 to 6):0.02 to 6;b) reacting the isocyanate-terminated prepolymer formed in step a) with a polyhydroxyl compound having a molecular weight of from 800 to 6000; and, optionally, withc) a chain extender and/or a crosslinker having a molecular weight of up to 800, and, optionally, with;d) a catalyst, and, optionally, with;e) a water-containing blowing agent, and, optionally, with;f) additives; andthereby forming a non-thermoplastic polyurethane elastomer.