Peroxyester preparation method
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United States of America Patent
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Oct 21, 2008
Grant Date -
Sep 9, 2004
app pub date -
Feb 7, 2002
filing date -
Feb 13, 2001
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Abstract
The present invention relates to a process for the preparation of a peroxyester which can be used in particular in polymerizations, such as the polymerization of vinyl chloride, or in the thermosetting of polyester resins.This process comprises the reaction of a hydroxyhydroperoxide salt with an acid halide or an acid anhydride under the following conditions: the molar ratio R.sub.b of the hydroxyhydroperoxide corresponding to the hydroxyhydroperoxide salt to the acid halide is between 0.5 and 1.5; or alternatively the molar ratio R.sub.b' of the hydroxyhydroperoxide corresponding to the hydroxyhydroperoxide salt to the acid anhydride is between 1.0 and 3.0; the hydroxyhydroperoxide salt was prepared beforehand by reaction of the corresponding hydroxyhydroperoxide with a base according to a molar ratio R.sub.a of the base to the hydroxyhydroperoxide of between 0.5 and 1.5; and this process is carried out in aqueous media. The invention also relates to an aqueous emulsion comprising the peroxyester obtained and to a polymerization process employing a radical initiator comprising this peroxyester.
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