Biobased Polyester Diols And Polyols From High Molecular Weight Polyhydroxyalkanoates
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United States of America Patent
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Apr 11, 2013
app pub date -
Sep 27, 2012
filing date -
Oct 5, 2011
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Abstract
Methods for producing biobased hydroxyl-terminated polyester polymers are described wherein molten-dispersed or hydrocarbonaceous fluid-dispersed phase polyhydroxyalkanoate polymers are reacted with a difunctional hydroxylated insertion compound at a sufficient temperature and time to depolymerize the starting polyester polymers to provide hydroxyl-terminated reaction products of reduced molecular weight. The difunctional hydroxylated insertion compound can be at least one of diol, aminoalcohol, and polyhydroxyalcohol. The use of catalyst may be required, reduced or eliminated. The hydroxyl-terminated reaction product is at least one of hydroxyl-terminated polyhydroxyalkanoate. A method for making polyurethanes further is described wherein the hydroxyl-terminated reaction product is reacted with polyfunctional isocyanate to form a polyurethane product. Products that include the hydroxyl-terminated reaction product or polyurethane also are described.
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