INCORPORATING SILICA FILLER INTO POLYSILOXANE RUBBER

Canada

PATENT NO 1334706
SERIAL NO

537750

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Abstract

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There is disclosed a method for incorporating silica filler into polysiloxane gum. This method includes the steps of mixing curable, non-condensable, polysiloxane gum, silica filler, and condensable diorganopolysiloxane; and heating said mixture to a temperature of at most about 210.degree.C for a sufficient time to complete the condensation reaction between said silica filler and said condensable diorganopolysiloxane. The method permits silica filler to be surface treated in situ following addition to the curable polysiloxane gum.

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