High-concentration cross-linking masterbatches

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 5/14 (2006.01) C08J 3/22 (2006.01) C08K 3/22 (2006.01)

Patent

CA 2378297

The invention relates to a cross-linking masterbatch comprises more than 40 % by weight of organic peroxide, a synthetic rubber, and a specific silica. More specifically, a highly concentrated cross-linking masterbatch is provided comprising from 40 to 70 % organic peroxide, a synthetic rubber such as EPM and/or EPDM, preferably having a propylene content of 45 % or more and a Mooney viscosity at 100 ~C of 30 or more, and a wet-treated and/or dry-treated silica having a specific surface area of 150 m2/g or more or a porous silica having a pore volume of 1.4 ml/g or more.

La présente invention concerne un mélange maître de réticulation qui comprend plus de 40 % en masse d'un peroxyde organique, un caoutchouc synthétique, et une silice spécifique. Cette invention concerne plus particulièrement un mélange maître de réticulation hautement concentré qui comprend entre 40 % et 70 % de peroxyde organique, un caoutchouc synthétique tel que l'EPM ou l'EPDM, possédant de préférence un contenu de propylène de 45 % au moins et une consistance Mooney de 30 au moins à 100 ·C, et une silice traitée à sec et/ou une silice traitée en milieu humide qui possède une zone de surface spécifique de 150 m?2¿/g au moins ou une silice poreuse qui possède un volume de vide de 1.4 ml/g au moins.

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