The Dow Chemical Company

Duane B Priddy

James M Roe

The title compounds are useful vinyl polymerization initiators of high thermal stability and correspond to the formula: ##STR1## wherein R is an x-valent hydrocarbon whose chain length can be interrupted by one or more ether linkages, R' is an aliphatic moiety of 1 to about 10 carbon atoms, R' is a tertiary hydrocarbon, and x is an integer of at least 2.

Hydrocarbon polyl gem-bis(t-alkylperoxy)alkanoates derived from

Styrene-acrylic acid or styrene-methacrylic acid copolymers having improved physical properties are prepared by the solution copolymerization of styrene and acrylic acid and/or methacrylic acid at a temperature between 110.degree. and 150.degree. C. in the presence of certain tertiary butyl peroxides.

Process for the preparation of improved styrene acrylic acid copolymers

Styrene and acrylic acid or methacrylic acid copolymers can be devolatilized at a temperature above 200.degree. C. and below the decomposition temperature of the copolymer under vacuum in the presence of a monohydric compound such as alcohol or water without significant increase in molecular weight or the formation of undesirable and insoluble gels.

Devolatilizing polymers of styrene and acrylic or methacrylic acid

Organic peroxide compositions suitable for free radical polymerization, the compositions comprising a mixture of a shock-sensitive peroxide and a diluent, the diluent being a monomeric material containing olefinic unsaturation which does not readily homopolymerize.

Organic peroxide compositions

Method for polymerizing olefinically unsaturated monomers employing a

A process for preparation of water-soluble polyvinylbenzyl quaternary ammonium halides by the halomethylation and subsequent quaternization of a polystyrene with the improvement that said polystyrene is a cationically-initiated polystyrene of about 1000 to about 50,000 M.sub.w and M.sub.w /M.sub.n ratio of less than about 8, preferably having less than about 0.1 mole percent residual unsaturation. The quaternized product is useful as a water clarifier and as electroconductive film for copying paper and the like.

Preparation of a water-soluble polyvinylbenzyl quaternary ammonium halide

Di-t-butylperoxy ketals are prepared from t-butyl hydroperoxide and the appropriate ketone in the presence of from 1 to 10 times the weight of ketone of ethylbenzene employing an acidic catalyst. Water is removed by azeotropic distillation with ethylbenzene and excess t-butyl hydroperoxide is subsequently removed by azeotropic distillation of additional ethylbenzene to provide a solution of the di-t-butylperoxide ketal in ethylbenzene which is particularly desirable as an initiator for styrene polymerization.

Process for the manufacture of di-t-butylperoxy ketals

Dialkyl alkylenebis(peroxydicarbonates) and oxyalkylenebis(peroxydicarbonates) and corresponding higher polyfunctional peroxydicarbonic acid esters are useful initiators of vinyl polymerization. These compounds are prepared by reacting a sodium alkylperoxycarbonate with a diol bis(chloroformate) at from about -10.degree.C to about 20.degree.C.

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Coleman, MI, United States of America

Duane B Priddy