Patent ID: 6166166
Filing Date: 2000-12-26
Classification: C08G

Abstract:
A process for making a thermoplastic polyurethane material comprising the steps of:a) casting an NCO-terminated prepolymer with 1,4-butanediol to form a casting composition wherein said NCO-terminated prepolymer comprises the reaction of a polyisocyanate with an end-functionalized linear non-crosslinked polyolefin without pendant chain-branched groups prepared by reacting 1,4-diacetoxy-2-butene with 1,5-cyclooctadiene in the presence of a catalyst comprising a ruthenium metal carbene complex followed by processing to form hydroxyls, characterized in that the functionality number of said polyolefin as determined by titration and vapor phase osmometry is 2.0 or less, and the viscosity of said polyolefin ranges from about 800 to 16,000 mPa.multidot.s @ 25.degree. C. wherein said polyolefin has a molecular structure of ##STR2## wherein n is a number average value of from 13 to 60; b) extruding said casting composition to form at least one strand of a polyurethane elastomer;c) pelletizing said at least one strand of said polyurethane elastomer to form at least one pellet; andd) processing said at least one pellet to form said thermoplastic polyurethane material.