Photopolymerization of episulfides using metal complexes and its use for making ophthalmic lenses
US6592801B2 · kind B2 · utility
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13References
35Claims
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Key dates
| Filing date | Apr 30, 2001 |
| Grant date | Jul 15, 2003 |
| Priority date | — |
| Expiry date | Jun 5, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for polymerizing episulfide monomers comprising the steps of:(c) mixing to an episulfide monomer or a mixture of episulfide monomers an effective amount of at least one photopolymerization catalyst selected from the group consisting of (cyclopentadienyl) ruthenium and osmium complexes and an effective amount of at least a co-catalyst selected from phosphonium salts, phosphines and amines; and(d) irradiating the mixture of (a) with an ultra-violet radiation to polymerize the mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.