Non-hydrous soft contact lens and process for producing the same
US4737556A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 28, 1986 |
| Grant date | Apr 12, 1988 |
| Priority date | — |
| Expiry date | Nov 28, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A non-hydrous soft contact lens comprising a copolymer comprising, as monomer units, 49.9 to 95 mole % of an acrylate represented by Formula (I) shown below, 0 to 10 mole % of acrylic acid or the specified ester thereof, 4.9 to 50 mole % of a methacrylate represented by Formula (II) shown below, and 0.1 to 10 mole % of a crosslinking monomer. ##STR1## wherein R.sup.1 is at least one selected from the group consisting of a particular straight chain fluoroalkyl group and a particular straight chain alkyl group. ##STR2## wherein R.sup.2 is a particular straight chain fluoroalkyl group. The present soft contact lens requires no sterilization by boiling, and has good resistance to stain, good oxygen permeability, good elastic recovery and good shape stability. A process for producing the above non-hydrous soft contact lens, comprising the step of subjecting a rigid precursor lens to treatment(s) of esterification and/or transesterification, is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.