Preparing thermo-plastic or elastomeric materials for...

C - Chemistry – Metallurgy – 08 – J

Patent

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400/2005

C08J 3/24 (2006.01) C08F 8/42 (2006.01) C08G 77/50 (2006.01) C08K 3/22 (2006.01) C08K 5/09 (2006.01) H01B 3/42 (2006.01) H01B 3/46 (2006.01)

Patent

CA 1061496

ABSTRACT OF THE DISCLOSURE Siloxane cross-linking of polyethylene is carried out under in situ development of water by chemical reaction between an organic acid and a non-hygroscopic metal oxide producing a neutral salt and water. Specifically, an ester peroxide is used as additive to be mixed with silane and polyethylene. The ester peroxide decomposes during grafting in free acid, alcohol and graft initiators for obtaining the grafting of silane on polyethylene, and the acid reacts with zinc oxide or tin oxide, also used as additive, to obtain salt and water. Alternatively, stearic acid or adipic acid and zinc oxide or tin oxide are added to a polyethylene silane mixture to develop water and salt of the acid. The present invention is a useful improvement over the prior art in that it permits a more careful control of the stoichiometry of the cross-linking reaction re- sulting in a more uniform product while doing away with the necessity for a water bath.

235826

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