Document Type and Number:
Japanese Patent JPH0371965
Kind Code:
B2
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. Solvolysis of these copolymers provides novel water-insoluble, non-crossiinked, 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 ocular devices such as contact lenses.A process for preparing thermoformed articles including ocular devices using the copolymers of the invention is described.
Inventors:
RONARUDO FUERUDEINANDO OFUSUTETSUDO
Application Number:
JP11291484A
Publication Date:
November 15, 1991
Filing Date:
June 01, 1984
Export Citation:
Assignee:
MINNESOTA MINING & MFG
International Classes:
B29C39/02; B29C43/02; B29D11/00; B29D11/02; C08F8/12; C08F18/02; C08F216/06; C08F218/00; C08F218/02; C08F218/04; C08F218/08; G02B1/04; B29K31/00; B29L11/00
Next Patent: JPH0371966