Other

Akzona Incorporated

Gerrit Frits Drost

Reinder Torenbeek

Jernej Jelenic

Jan D Van Drumpt

Akio Ishiwatari

Akihiko Tkai

Frans Johannes Van Moorsel

This application relates to compositions of cross-linking peroxides which have excellent storage stability, without exudation of peroxide taking place, which contain the organic peroxide in a high concentration, and which are easily blendable with a rubber to be cross-linked. The compositions are obtained by mixing a softening agent with a Brookfield viscosity of 10,000 poises or less at 60 &deg; C. with an organic peroxide, preferably in the presence of a filler, and optionally with further ingredients.

Cross-linking compositions

A process for the preparation of an organic peroxide master batch comprising about 20-60% by weight of an organic peroxide and about 40-80% by weight of a polymer capable of being cross-linked by the peroxide, is disclosed. The process comprises contacting particles of such a polymer, having a diameter from about 200 microns to about 20 millimeters, at a temperature from about 15.degree. C. to about 95.degree. C., with a liquid medium which is not a physically stable emulsion and which comprises from about 2 to about 100 percent, by weight, of a peroxide which is a liquid at said temperature and from about 0 to about 98 percent, by weight, of a suitable liquid in which the peroxide and the polymer are insoluble, for a period of time sufficient to incorporate from about 20 to about 60 percent of peroxide in the polymer particles, based on the total weight of the polymer particles containing the peroxide, said medium being present in such an amount that after the incorporation of the peroxide essentially all of the polymer particles are completely surrounded by the liquid medium.

Process for preparing peroxide master batches

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Schalkhaar, Netherlands

Gerrit Frits Drost