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

1999-05-18

Buttner, David

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428480, 428481, 428483, 428511, 428514, 428520, 428 366, 525 58, 525 61, C09D129/04

Patent

active

059049740

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: 3859125 (1975-01-01), Miller
patent: 4284671 (1981-08-01), Cancio
patent: 4372986 (1983-02-01), Imada
patent: 4376153 (1983-03-01), Cardy
patent: 5612412 (1997-03-01), Watanabe

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