Spectacle lens
US5952096A · kind A · utility
33Cited by
3References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1997 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Jan 23, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31507
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A spectacle lens formed from a resin composition which consists essentially of (1) 100 parts by weight of a polycarbonate resin; (2) 0.05 to 0.5 part by weight of an ultraviolet absorber (A) having a maximum absorption in a wavelenght of 300 to 345 nm when measured in a chloroform solution; and (3) 0.01 to 0.3 part by weight of an ultraviolet absorber (B) having a maximum absorption in a wavelenght of 346 to 400 nm when measured in a chloroform solution. The spectacle lens has excellent impact resistance and transparency and high absorbing power for ultraviolet light having a specific wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.