Bound antioxidant masterbatches
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United States of America Patent
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Sep 11, 1990
Issued Date -
N/A
app pub date -
Jul 7, 1989
filing date -
Mar 19, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for preparing a bound antioxidant polymer concentrate is described which comprises grafting one or more acrylic or alkylacrylic esters or amides containing a hindered-amine group onto the polymer in the presence of a radical generator at a temperature of 100.degree. to 350.degree. C., the molar ratio of said radical generator to said ester or amide being from 0.001: to 1:1, the reaction being continued for a time such that the melt viscosity of the polymer which increases initially during the reaction has reduced to a level which permits the concentrate to be homogeneously blended subsequently into a unstabilized polymer.
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