Polyvinyl alcohol derivatives containing pendant (meth)acryloyl

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

1987-01-08

1988-01-19

Ziegler, Jacob

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160H, G03B 2146

Patent

active

047201878

ABSTRACT:
Organic aprotic solvent soluble 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 units of the formula ##STR1## 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 crosslinked hydrogel contact lenses made therefrom and their preparation.

REFERENCES:
patent: 3928299 (1975-12-01), Rosenkranz et al.
patent: 4665123 (1987-05-01), Goldenberg

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