High molecular weight lenses formed from viscosity-specific polycarbonate
US7135545B2 · kind B2 · utility
4Cited by
4References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2004 |
| Grant date | Nov 14, 2006 |
| Priority date | — |
| Expiry date | Oct 19, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Methods are disclosed which utilize polycarbonate to form solid optical lenses. The polycarbonates may be selected from high molecular weight linear or branched species. Viscosity and melt flow are specified for improved mechanical properties. The method provides lenses with greater resistance to cracking and crazing, for example, in instances where flaws are subject to strain and require containment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.