Polyvinyl alcohol derivatives containing pendant (meth)acryloylv

Details Polyvinyl alcohol derivatives containing pendant (meth)acryloylv Polyvinyl alcohol derivatives containing pendant (meth)acryloylv

1985-12-13

1987-05-12

Bleutge, John C.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 61, 525127, 523106, 351160R, 351160H, C08F 800, G02C 704

Patent

active

046651233

ABSTRACT:
Organic aprotic solvent insoluble polymers which are derivatives of a polyvinyl alcohol, having a weight average molecular weight of at least about 2,000, and containing from about 0.5 to about 90 percent, based on the number of hydroxyl groups in said polyvinyl alcohol, of an addition reaction product of units of the formula ##STR1## with a vinylic monomer, wherein R.sub.1 and R.sub.2 are independently alkylene, arylene, cycloaliphatic, aralkylene or aralkarylene, n is 0 or 1, A.sub.1 is a carbamoyloxy or ureido linking group, A is an oxa, imino or ureido group, R.sub.3 is hydrogen or methyl, R.sub.4 is hydrogen, or when R.sub.3 is hydrogen, methyl or also --COOR.sub.5 where R.sub.5 is hydrogen or lower alkyl, and hydrogel contact lenses made therefrom and their preparation.

REFERENCES:
patent: 4085168 (1978-04-01), Milkovich et al.
patent: 4347198 (1982-08-01), Ohkada et al.
patent: 4426492 (1984-01-01), Steckler

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