Photocrosslinked polymers

Details Photocrosslinked polymers Photocrosslinked polymers

1995-12-22

1998-08-04

Szekely, Peter A.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

264 11, 351106R, 351106H, 522 84, 522 85, 522 86, 522154, 522152, 523106, 525 57, 525 59, 525 61, 525937, 525 58, C08J 500, C08J 718, C08L 2904, B29D 1100

Patent

active

057894647

ABSTRACT:
The invention relates to a novel process for the manufacture of mouldings, especially contact lenses, in which a soluble prepolymer comprising crosslinkable groups is crosslinked in solution, and also to mouldings, especially contact lenses, obtainable in accordance with that process. The present invention relates also to novel prepolymers that can be used in the process according to the invention, especially derivatives of a polyvinyl alcohol having a molecular weight of at least about 2000 that, based on the number of hydroxy groups of the polyvinyl alcohol, comprise from approximately 0.5 to approximately 80% of units of formula I ##STR1## wherein R is lower alkylene having up to 8 carbon atoms,
R.sup.1 is hydrogen or lower alkyl and
R.sup.2 is an olefinically unsaturated, electron-attracting, copolymerisable radical preferably having up to 25 carbon atoms, to crosslinked polymers, either homo- or co-polymers of those novel prepolymers, to processes for the preparation of the novel prepolymers and the homo- and co-polymers obtainable therefrom, to mouldings made from the said homo- or co-polymers, especially contact lenses made from those homo- or co-polymers, and to processes for the manufacture of contact lenses using the said homo- or co-polymers.

REFERENCES:
patent: 4113224 (1978-09-01), Clark
patent: 4712765 (1987-12-01), Sabet
patent: 4897228 (1990-01-01), Miwa et al.

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