Silver halide activated photochromic plastics
US4049567A · kind A · utility
8Cited by
6References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1976 |
| Grant date | Sep 20, 1977 |
| Priority date | — |
| Expiry date | Mar 17, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/705
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Photochromic plastic materials are disclosed which comprise a polymeric matrix containing a multiplicity of activated silver halide particles less than 1000 Angstroms in size. The matrix may contain a retained amount of plasticizer which optimizes the desirable photochromic properties and may be sealed to prevent loss of plasticizer. The materials are made by forming activated silver halide particles in the presence of a film forming polymer dissolved in a plasticizer and removing the plasticizer to produce a supple, shape-retaining element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.