Process for preparing multipurpose polymer bound stabilizers and polymer bound stabilizer produced thereby
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United States of America Patent
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Mar 17, 1992
Issued Date -
N/A
app pub date -
Sep 24, 1990
filing date -
Aug 12, 1987
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Expired
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Abstract
Polymer bound stabilizer compounds are provided in which two or more different classes of stabilizers are chemically bound to anhydride containing polymers or copolymers. Polymeric stabilizers are prepared by the reaction of primary amino or hydrazido substituted stabilizers (i.e., antioxidants, light stabilizers, etc.) 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 temperatures. The polymer bound stabilizer compounds may be used as concentrates to stabilize other polymer systems.
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