Poly (meth) acrylamides with improved color stability under thermal stress
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United States of America Patent
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Mar 21, 2000
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N/A
app pub date -
May 12, 1998
filing date -
Nov 30, 1995
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Expired
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Abstract
Molding compositions MC having a reduced tendency to yellow with thermal stress which consist of a polymer PM containing units of formula I: ##STR1## blending from 0.005-1 wt % of at least one reducing inorganic phosphorus compound IP selected from the group consisting of phosphinic and phosphonic acid and its alkali metal, alkaline-earth metal, aluminum and ammonium salts, wherein the ammonium ion can be substituted with up to four C.sub.1 -C.sub.4 alkyl and/or C.sub.5 -C.sub.8 cycloalkyl groups, with the polymer PM after conclusion of the imidation reaction.
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