Use of polydiene diols in thermoplastic polyurethanes
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United States of America Patent
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Jul 20, 1999
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app pub date -
Jun 23, 1995
filing date -
Jun 23, 1995
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Abstract
Thermoplastic polyurethanes are formed from a polydiene diol, preferably a hydrogenated polybutadiene diol, having from 1.6 to 2 terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000, an isocyanate having two isocyanate groups per molecule, and optionally a chain extender having two hydroxyl groups per molecule. The thermoplastic polyurethane composition is prepared by a prepolymer method. preferably a solventless prepolymer method using the branched chain extender.
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