Preparing thermo-plastic or elastomeric materials for cross-linking of grafted silane
AssigneeKabel-und Metallwerke Gutehoffnungshutte Aktiengesellschaft
InventorHermann Uwe Voigt
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Abstract
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.
Claims17
In a method cross-linking thermo-plastic or elastomeric material in the presence of moisture, the material being prepared by grafting a silane compound, the improvement comprising the step of adding to and mixing with the material, compounds which form water by chemical reaction, the adding being carried out prior to grafting to obtain cross-linking of grafted silane through the water as formed in situ by the reaction and throughout the material.
Dependencies are inferred from the claim text.