Process for the manufacture of a substrate made of transparent organic glass and substrate thus obtained
US5730911A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1996 |
| Grant date | Mar 24, 1998 |
| Priority date | — |
| Expiry date | Jun 26, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/0026
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The process comprises: PA1 (a) the introduction into a mould of a composition which is polymerizable into a transparent organic glass PA1 (b) the polymerization of the composition under conditions such that the resulting substrate made of transparent organic glass has at least one thin surface layer polymerized to a degree of progression and/or of crosslinking which is appreciably lower than that of the remainder of the substrate, PA1 and optionally (c) a stress-relieving thermal anneal of the substrate. Application to the manufacture of finished or semi-finished optical or ophthalmic items, in particular photochromic optical or ophthalmic items.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.