Abstract:
Disclosed are novel blends of peroxides that have melting points of about 5.degree. C. and lower. The blends consist essentially of (1) t-butyl cumyl peroxide, (2) bis(.alpha.-t-butylperoxyisopropyl)benzene, and (3) dicumyl peroxide.
Abstract:
An olefin such as .alpha.-methylstyrene or a substituted .alpha.-methylstyrene, wherein the substituent is on the phenyl ring, a t-cumyl halide corresponding to the hydrohalogenated olefin or a substituted t-cumyl chloride and hydrogen peroxide are reacted under relatively non-aqueous conditions, in the absence of a free acid and in the presence of a phenol, to obtain a symmetrical dicumyl (or substituted dicumyl) peroxide which is useful as cross-linking agents for polyethylene and elastomers.
Abstract:
A method of producing hydroxy-containing dialkyl peroxides of the formula ##STR1## by either heterogeneously catalytically reducing or homogeneously, non catalytically chemically reducing carbonyl-containing dialkyl peroxides of the formula ##STR2## R, R.sub.1, R.sub.2 and R.sub.3 are aliphatics. This invention also concerns novel hydroxy-containing dialkyl peroxide compounds having the structure of formula I.
Abstract:
Storage stable liquid compositions are prepared from solid acyl alkylsulfonyl peroxides and polar or polarizable solvents or solvent mixtures. The compositions are liquid at 0.degree. to -40.degree. C and are useful as free-radical initiators for polymerizaton of vinyl monomers.
Abstract:
Improved organic aldehyde and ketone peroxide compositions useful for initiating the polymerization of polyesters formed from the concurrent reaction of a beta dione such as 2,4-pentanedione and a different (non-beta dione) ketone or aldehyde, for example methyl ethyl ketone, with aqueous hydrogen peroxide.
Abstract:
In a process for producing a dicumyl peroxide comprising reacting a cumene hydroperoxide and an .alpha.,.alpha.-dimethylbenzyl alcohol in the presence of an acid catalyst, when a polar solvent exists in the reaction system, the cumene hydroperoxide of the starting material and the dicumyl peroxide of the resulting product are scarcely decomposed.
Abstract:
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.
Abstract:
The reaction rates for the interaction of tertiary hydroperoxides with tertiary alcohols to afford di-tertiary peroxides are increased by carrying out the reaction in the presence of a carboxylic acid anhydride.
Abstract:
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.
Abstract:
Meta-and/or paradiisopropylbenzene dihydroperoxides are continuously produced by oxidizing meta-and/or paradiisopropylbenzenes in liquid phase through contact with oxygen or a gas containing oxygen, while keeping the concentration of meta-and/or paradiisopropylbenzene monohydroperoxides of the oxidation product solution in a range of 20 to 40% by weight.