Method of manufacturing a photochromic molded article
US6572794B1 · kind B1 · utility
8Cited by
10References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2000 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Mar 8, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2011/0016
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing a photochromic molded article which comprises the steps of:filling a mold with a photopolymerizable monomer composition containing a photopolymerizable monomer, a photoinitiator and a photochromic compound capable of coloring upon UV irradiation;pre-heating the composition to a temperature which reduces or prevents coloration of the photochromic compound during the subsequent photopolymerization step; andphotopolymerizing the composition under irradiation with a light comprising a UV portion and a UV-visible portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.