Increasing the yield of cast plastic lenses
US3944637A · kind A · utility
18Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1974 |
| Grant date | Mar 16, 1976 |
| Priority date | — |
| Expiry date | Feb 11, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F18/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A terpolymer plastic lens having equal or greater light transmission, greater hardness and scratch resistance equal to the monomers used in prior art plastic lenses is obtained by the co-polymerization of diethylene glycol bis (allyl carbonate), methyl methacrylate and methacrylic acid or acrylic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.