PVA-base thermoplastic copolymer, and its production process and use
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United States of America Patent
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Jul 13, 1999
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app pub date -
Jun 25, 1997
filing date -
Aug 31, 1995
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Abstract
A PVA-base copolymer is obtained by subjecting a lactone, whose ring is formed of 3 to 10 carbon atoms, to ring-opening polymerization in the presence of polyvinyl alcohol (PVA). The copolymer comprises a PVA chain and an aliphatic polyester grafted as a ring-opened polymer of the lactone on the PVA chain. Further, the copolymer has a PVA content of 2 to 98 wt. %, a polyester content of 98 to 2 wt. %, and a number average molecular weight of 10,000 to 500,000.
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