Copolymers of poly(vinyl trifluoroacetate) or poly(vinyl alcohol

Details Copolymers of poly(vinyl trifluoroacetate) or poly(vinyl alcohol Copolymers of poly(vinyl trifluoroacetate) or poly(vinyl alcohol

1987-06-17

1988-10-25

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526271, 526330, C08F 2022

Patent

active

047805145

ABSTRACT:
Novel, non-crosslinked copolymers of vinyl trifluoroacetate (VTA) and up to 5 weight percent of the VTA of certain comonomers, such as vinyl esters or disubstituted ethylene monomers, are disclosed. Solvoylsis of these copolymers provides novel water-insoluble, non-crosslinked, poly(vinyl alcohol) copolymers which can be hydrated to copolymers having controllably variable hydrogel properties and high strength. Such poly(vinyl alcohol) copolymers are particularly desirable as optical devices such as contact lenses.

REFERENCES:
patent: 2436144 (1948-02-01), Howk et al.
patent: 3220960 (1965-11-01), Wichterle
patent: 3361858 (1968-01-01), Wichterle
Harris et al., J. Polymer Sci., A-1, 4, 665-677 (1966).
Haas et al., J. Polymer Sci., 22, 291 (1956).
L. A. Vol'f et al., Khim Volokna, 2, 14 (1979).
J. Chernikov et al., Nauchn Tr., Kuban Gos. Univ., 243, 141 (1977).

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