Process for the manufacture of a substrate made of transparent organic glass and substrate thus obtained
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United States of America Patent
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Mar 24, 1998
Grant Date -
N/A
app pub date -
Jun 26, 1996
filing date -
Mar 3, 1995
priority date (Note) -
Expired
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Abstract
The process comprises: (a) the introduction into a mould of a composition which is polymerizable into a transparent organic glass (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, 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.
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