Polyvinyl alcohol derivatives containing pendant (meth)acryloylvinylic monomer reaction product units bound through urethane groups and hydrogel contact lenses made therefrom
US4665123A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1985 |
| Grant date | May 12, 1987 |
| Priority date | — |
| Expiry date | Dec 13, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2210/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.