Composition for urethane-base plastic lens, urethane-base plastic lens obtained from the composition, and process for the production of the plastic lens
US5693738A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1995 |
| Grant date | Dec 2, 1997 |
| Priority date | — |
| Expiry date | Mar 29, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/041
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A composition for a urethane-base plastic lens, comprising: PA1 (a) at least one ester compound selected from the group consisting of isocyanate compounds, isothiocyanate compounds and isocyanato-containing isothiocyanate compounds, PA1 (b) at least one active hydrogen compound selected from the group consisting of hydroxyl compounds, mercapto compounds and mercapto-containing hydroxyl compounds, PA1 (c) a tertiary amine, and PA1 (d) a Lewis acid; a plastic lens obtained by heating and curing the composition, and a process for the production of the plastic lens. The composition has a long pot life and can produce an optically uniform plastic lens in a short time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.