Piperidinyl phthalimide hindered amine light stabilizers
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United States of America Patent
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Apr 18, 1995
Issued Date -
N/A
app pub date -
Aug 26, 1993
filing date -
Jun 12, 1987
priority date (Note) -
Expired
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Abstract
Hindered amine light stabilizers are provided in which the hindered amine is contained in a unit of formula ##STR1## where X is ##STR2## and R.sup.1, R.sup.2, R.sup.3, and A are as defined as in the Summary of the Invention. Unique polymeric and non-polymeric compounds containing this unit are useful as additives for the stabilization of polymeric compositions which are normally subject to thermal, oxidative or actinic light degradation.
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