Self-light-stabilized photochromic polymer, its preparation and articles containing same
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United States of America Patent
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Nov 13, 2001
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N/A
app pub date -
Oct 4, 1999
filing date -
Apr 4, 1997
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Abstract
The objects of the present invention are: a self-light-stabilized photochromic thermoplastic or thermoreticulated polymer carrying non-cyclic tertiary amide-functionalized pendant groups; its preparation method; photochromic articles constituted, wholly or in part of such a polymer. Said polymer is obtained advantageously by radical co-polymerization of a composition containing an effective amount of at least one monomer of the formula: ##STR1## in which: R.sub.1 is hydrogen or a methyl group; n is 2 or 3; R.sub.2 and R.sub.3 are identical or different and represent independently a methyl or ethyl group; and are advantageously identical; said monomer providing said photostabilizing non-cyclic tertiary amine-functionalized pendant groups.
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