Photocrosslinked polymers

Details Photocrosslinked polymers Photocrosslinked polymers

1996-07-03

1998-12-15

Szekely, Peter A.

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

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

522 84, 522 86, 523106, 523107, 523108, 525 58, 525 59, 525 60, 525 61, 525937, 264 11, C08J 500, C08J 718, C08L 2904, B29D 1100

Patent

active

058498109

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,

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Moviol Polyvinyl Alcohol,Hoechst, Dec. 1991.

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