Peroxid-chemie Gmbh

Wacker-chemie Gmbh

Eberhard Hagel

Maximilian Dorn

Werner Zeiss

Klaus Kohlhammer

Erwin Rossberger

Josef Weinmaier

Process for the production of 2,5-dimethyl-2,5-di-t-butylperoxy-hexane

Process for producing 2,5-dimethyl-2,5-dihydroperoxyhexane

Diacylperoxide esters

A process for the preparation of aralkyl hydroperoxides having the formula (I) is described ##STR1## in which n=1, 2 or 3, Ar means a phenyl group which can be substituted with halogen or one or more branched or straight chain alkyl groups with 1 to 5 C-atoms, or a naphthyl group, and each radical R.sup.1 and R.sup.2 means a low alkyl radical, the alkyl radicals R.sup.1 and R.sup.2 together having 2 to 4 carbon atoms, by reaction of aralkyl carbinols having the formula (II) ##STR2## in which Ar, R.sup.1, R.sup.2 and n have the meaning given for formula (I), with hydrogen peroxide under acid conditions, the reaction being carried out in the presence of an acid-combining agent. An alkali sulphate, ammonium sulphate, alkali hydrogen sulphate and/or ammonium hydrogen sulphate is used in preference as the acid-combining agent. Tert.aralkyl hydroperoxides can be prepared in high yield with a high purity in a simple and safe manner with this process.

Process for the preparation of aralkyl hydroperoxides

Disclosed is a process for the preparation of tert. alkyl-tert. aralkyl peroxides with the general formula ##STR1## where R represents an alkyl radical with 1 to 4 C-atoms, R', R' and R'' represent the same or different alkyl radicals with 1 to 5 C-atoms and n is a number from 1 to 3, by reacting an olefin with the general formula ##STR2## with a tert. alkyl hydroperoxide with the general formula ##STR3## where R, R' and R' and R'' and n having the meaning indicated above the presence of aqueous hydrochloric acid.

Process for the preparation of tert. alkyl-tert. aralkyl peroxides

The present invention provides a process for cross-linking organopolysiloxanes by means of a bis-benzoyl peroxide derivative with heating, wherein, as bis-benzoyl peroxide derivative, there is used at least one compound of the general formula: ##STR1## in which the symbols R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5, each independently of one another, have the following meanings: R.sup.1 and R.sup.5 are the same or different and signify alkoxycarbonyl radicals with 2 to 4 carbon atoms in the alkyl moiety or fluorine or hydrogen atoms, R.sup.2 and R.sup.4 are the same or different and signify alkyl radicals with 2 to 8 carbon atoms or hydrogen atoms and R.sup.3 signifies an alkyl radical with 1 to 8 carbon atoms or a hydrogen atom, at least 2 symbols and at most 4 symbols per benzene ring signifying hydrogen atoms. The present invention also provides an agent for carrying out this process which consists essentially of silicone oil in which is contained, in finely divided form, 10 to 80% by weight of at least one compound of general formula (I).

Process and agent for cross-linking organopolysiloxanes

Growing community of inventors

Icking, Germany

Eberhard Hagel