Abstract: There are disclosed new organic peroxides having two peroxy functional groups and containing in their molecule an atom of salified aminic nitrogen, having the general formula: ##STR1## in which: R.sub.1, R.sub.2 are each an alkyl radical having 1 to 8 carbon atoms, optionally aryl-substituted, preferably a tertiary alkyl group such as t.butyl, t.amyl, t.octyl and cumyl;R.sub.3 is a hydrogen, an alkyl radical having 1 to 8 carbon atoms, a cycloalkyl having 5-6 carbon atoms in the ring, an aryl, an arylalkyl optionally halogen, alkoxy-, carboalkoxy-, alkyl-, mono- or poly-substituted;R.sub.4 is the methylene, ethylene or trimethylene radical, optionally halogen-, alkoxy-, carboalkoxy-, aryl-, alkyl-, mono- or poly-substituted;R.sub.

Abstract: A process for preparing peroxidic mixtures, more particularly mixtures of ketone peroxides useful as polymerization initiators for unsaturated polyester resins, is disclosed. The process comprises in situ peroxidation of one or more ketone compounds with hydrogen peroxide, in a solvent which is a ketone peroxide formulation.

Abstract: New organic peroxides having the formula ##EQU1## may be prepared by reacting a monohydroperoxide selected from R.sub.5 OOH and R.sub.6 OOH with an unsaturated carbonyl compound having the formula ##EQU2## the reaction being carried out in the presence of an acid catalyst at a temperature between about -30.degree.C and +80.degree.C, the molar ratio of the carbonyl compound to the hydroperoxide being between about 1:2 and 1:10. The new organic peroxides are particularly useful for crosslinking plastomers, vulcanizing elastomers, and as initiators for radical polymerizations.

Abstract: Tetraperoxides of the formula ##EQU1## where X is a bivalent radical such as alkylene; R.sub.1 is hydrogen or an organic radical; R.sub.2 is alkylene alkoxy carbonyl; and R.sub.3 is an organic radical. Method of preparing tetraperoxides by addition reaction between a bis-hydroperoxide and a carbonyl compound to form a dihydroxy diperoxide, followed by condensation of the dihydroxy diperoxide with a tertiary monohydroxide. The tetraperoxides are useful for vulcanizing saturated elastomers, crosslinking plastomers, and initiating radical polymerization.

Abstract: New organic peroxides having the formula ##EQU1## may be prepared by reacting a monohydroperoxide selected from R.sub.5 OOH and R.sub.6 OOH with an unsaturated carbonyl compound having the formula ##EQU2## the reaction being carried out in the presence of an acid catalyst at a temperature between about -30.degree.C and +80.degree.C, the molar ratio of the carbonyl compound to the hydroperoxide being between about 1:2 and 1:10. The new organic peroxides are particularly useful for crosslinking plastomers, vulcanizing elastomers, and as initiators for radical polymerizations.