Initiating system for solid polyester granule manufacture
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United States of America Patent
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Mar 18, 2003
Grant Date -
N/A
app pub date -
Aug 23, 2001
filing date -
Jan 20, 1999
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Abstract
The invention relates to the use of a diacyl peroxide in combination with an aromatic amine of formula (I) where R.sup.1 is C.sub.1 -C.sub.20 alkyl having at least one hydroxy substituent or --(CH'CHR'--O).sub.n H where n is 1 to 10 and each R' is independently selected from H and C.sub.1 -C.sub.3 alkyl; R.sup.2 is C.sub.1 -C.sub.20 alkyl optionally substituted with one or more hydroxy groups, or --(CHR'CHR'--O).sub.n H where n=1 to 10; and each R is independently selected from H and C.sub.1 -C.sub.3 alkyl; and Ar is an optionally substituted aryl group; as a redox initiating system in a process for the manufacture of polyester granules by suspension polymerisation. This invention also relates to a process for preparing solid polyester granules using such a redox initiating system.
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