Method of preparing photochromic articles
US5981634A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1998 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Jul 22, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/041
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of preparing photochromic materials useful for optical applications, and photochromic materials prepared by such method, are described. Such method comprises polymerizing a blend of a polyol[(meth)acryloyl terminated carbonate] monomer and a photochromic amount of an organic photochromic substance, thereby forming a photochromic material. A preferred polyol[(meth)acryloyl terminated carbonate] monomer is diethylene glycol bis[(methacryloyloxy)ethylene carbonate]. Polymerization may be performed by free radical initiation using thermal initiators, photoinitiators or a combination of such initiators. Photochromic materials prepared by such method may be used in optical applications, e.g., photochromic lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.