Contact lens
US5883152A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1997 |
| Grant date | Mar 16, 1999 |
| Priority date | — |
| Expiry date | Jun 25, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F230/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A contact lens contains a copolymer obtained by copolymerizing, as an indispensable feed monomer, 2 to 95 wt. % of a carboxylic acid ester monomer and 98 to 5 wt. % of a copolymerizable monomer. The carboxylic acid ester monomer is represented by the formula (I) ##STR1## wherein R.sub.1 stands for a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an alkenyl group having 1 to 12 carbon atoms, a cyclic alkyl group having 3 to 12 carbon atoms or an aryl group, and X stands for ##STR2## in which R.sub.2 and R.sub.3 each stand for a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an alkenyl group having 1 to 12 carbon atoms, a cyclic alkyl group having 3 to 12 carbon atoms or an aryl group, m and 1 being integers of from 0 to 4, at least one of R.sub.1, R.sub.2 and R.sub.3 being a group containing a fluorine atom and n being an integer of from 0 to 4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.