Process for preparing polymer bound UV stabilizers
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United States of America Patent
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Mar 17, 1992
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N/A
app pub date -
Sep 24, 1990
filing date -
Aug 12, 1987
priority date (Note) -
Expired
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Abstract
Ultraviolet light stabilizers are chemically bound to anhydride containing polymers or copolymers. Polymeric stabilizers are prepared by the reaction of primary amino or hydrazido-substituted UV absorbers with some or all of the anhydride groups of the polymer or copolymer to form pendant stabilizer substituted imide or amic acid groups. The polymer bound stabilizers are not lost from the polymer system by volatilization, migration, or extraction, even at high temperature. The polymeric stabilizers of this invention may be used as they are or as concentrates to stabilize other polymer systems.
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