PVA-base thermoplastic copolymer, and its production process and

Details PVA-base thermoplastic copolymer, and its production process and PVA-base thermoplastic copolymer, and its production process and

1997-06-25

1999-07-13

Buttner, David

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 61, 428480, 428482, 428483, C09D12904, C08L 2904, C08F 816

Patent

active

059228083

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.

REFERENCES:
patent: 4988763 (1991-01-01), Kessler
patent: 5612412 (1997-03-01), Watanabe

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