Strong, silicone containing polymers with high oxygen permeability
US4486577A · kind A · utility
233Cited by
18References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1982 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Oct 12, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/672
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Clear, strong, crosslinked polymers are described, which are obtained by copolymerization of (A) 8-70% of a linear or branched polysiloxane of 400-100,000 molecular weight (MW) containing at least two terminal or pendant, polymerizable, vinyl groups per each 5000 MW unit of polysiloxane and which are attached to the polysiloxane through at least two urethane, thiourethane, urea or amide linkages and (B) 30-92% of a mono- or divinyl compound or a mixture of such monomers consisting of 85 to 100% of water insoluble monomers. These polymers are useful in the preparation of hard or soft contact lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.