Peroxyester preparation method

Details Peroxyester preparation method Peroxyester preparation method

2002-02-07

2008-10-21

Puttlitz, Karl J (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C560S231000

Reexamination Certificate

active

07439384

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 Rbof the hydroxyhydroperoxide corresponding to the hydroxyhydroperoxide salt to the acid halide is between 0.5 and 1.5; or alternatively the molar ratio Rb′ 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 Raof the base to the hydroxyhydroperoxide of between 0.5 and 1.5; andthis 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.

REFERENCES:
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patent: 4525308 (1985-06-01), Sanchez
patent: 4634753 (1987-01-01), Sanchez
patent: 2004/0049070 (2004-03-01), Overkamp et al.
patent: 0126216 (1984-11-01), None
patent: 1106953 (1968-03-01), None
Chemical Abstracts, vol. 99, No. 20, Nov. 14, 1983, Columbus, Ohio, US ; Abstract No. 159030, Horia, Mihai et al: “Tert-Butyl per-2-ethylhexanoate,” XP002180202.
Database WPI Section Ch, Week 198518 Derwent Publications Ltd., London, GB; AN 1985-107394, XP002180203.

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