Process for manufacturing photochromic articles
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United States of America Patent
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-
Jul 25, 1989
Grant Date -
N/A
app pub date -
Dec 17, 1986
filing date -
Dec 19, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A direct casting process for manufacturing a shaped synthetic plastic article, such as an ophthalmic lens, which has photochromic properties, the process comprising incorporating a photochromic spiro-oxazine compound into a mixture comprising a highly reactive polyfunctional monomer and a low amount of a polymerization catalyst, and curing the composition in a mould to form the shaped synthetic plastic article.
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