Polymer compositions for contact lenses
US5298533A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1992 |
| Grant date | Mar 29, 1994 |
| Priority date | — |
| Expiry date | Dec 2, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/54
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Copolymers useful as a contact lens material are prepared from a mixture comprising: PA0 (a) an N,N-dialkyl(meth)acrylamide monomer; and PA0 (b) a monomer represented by the formula: ##STR1## wherein: R.sup.1 is methyl or hydrogen; PA0 R.sup.2 is --O-- or --NH--; PA0 R.sup.3 and R.sup.4 are independently a divalent radical selected from the group consisting of --CH.sub.2 --, --CHOH-- and --CHR.sup.6 --; PA0 R.sup.5 and R.sup.6 are independently a branched C.sub.3 -C.sub.8 alkyl group; and PA0 n is an integer of at least 1, and m and p are independently 0 or an integer of at least 1, provided that the sum of m, p and n is 2, 3, 4 or 5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.