Photochromic core and shell matrix
US6525136B1 · kind B1 · utility
11Cited by
8References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2001 |
| Grant date | Feb 25, 2003 |
| Priority date | — |
| Expiry date | Aug 2, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/0906
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a composition comprising a matrix which comprises particles comprising a core resin and a shell resin thereover, wherein at least one of the core resin and the shell resin contains a chelating agent and a spiropyran compound of the formula wherein n is an integer representing the number of repeat —CH2— units and R is —H or —CH═CH2, wherein the shell resin is the continuous phase of the matrix, wherein the spiropyran compound can produce changes in the optical and photoactive properties of the resin containing the spiropyran when irradiated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.