Polymeric ophthalmic lens with crosslinker containing saccharide residue
US5690953A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1996 |
| Grant date | Nov 25, 1997 |
| Priority date | — |
| Expiry date | Sep 13, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F290/062
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An ophthalmic lens, particularly a soft hydrogel contact lens, is disclosed. The lens can be derived from a crosslinked polymer made by reacting a hydrophilic monomer with a crosslinking amount of a polyfunctional compound containing a saccharide residue. The preferred hydrophilic monomer is actually a mixture of the following individual hydrophilic monomers: a) the reaction product of a free radical reactive monoisocyanate and a monoalkoxy polyalkylether, b) N,N-dimethylacrylamide, and optionally c)hydroxyethyl methacrylate. The preferred polyfunctional compound is a prepolymer derived from an alkoxylated glucose or sucrose. This prepolymer can be made by reacting glucose or sucrose, which has been ethoxylated or propoxylated, with a free radical reactive isocyanate which has been capped. The free radical reactive isocyanate can be capped by reacting it with a polyalkylether, such as polyethylene glycol, and then reacting this intermediate with a diisocyanate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.