Method for the preparation of an organopolysiloxane composition

Details Method for the preparation of an organopolysiloxane composition Method for the preparation of an organopolysiloxane composition

1990-01-02

1991-08-13

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524188, 523209, 523212, C08K 554

Patent

active

050397362

ABSTRACT:
A curable organopolysiloxane composition, which is suitable for making a silicone rubber mold for mock-up molding with, for example, an epoxy resin, is prepared by the steps of (a) blending an organopolysiloxane having at least two silanol groups in a molecule, a finely divided silica filler having hydrophobic surface and hexamethyl disilazane to give a uniform mixture in a specified proportion; (b) subjecting the uniform mixture to a heat treatment; and (c) blending the heat-treated uniform mixture with an organosilane compound having at least three hydrolyzable groups in a molecule or a partial hydrolysis product thereof as a crosslinking agent. The composition has good flowability suitable for the preparation of a mold of any exquisite forms and the silicone rubber mold prepared from the composition exhibits good mold-releasability lastingly.

REFERENCES:
patent: 4221693 (1980-09-01), Getson et al.
patent: 4695603 (1987-09-01), Inoue et al.

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