Magnesium alloy-bonding organopolysiloxane composition having improved chemical resistance

Abstract

An organopolysiloxane composition suited for magnesium alloy bonding comprises (A) a specific organopolysiloxane, (B) a non-reactive silicone oil, (C) zinc oxide surface treated with a silane or siloxane treating agent, (D) heavy calcium carbonate surface treated with a paraffin treating agent, (E) an organosilicon compound having at least three hydrolyzable radicals or a partial hydrolyzate thereof, (F) a silane coupling agent having at least one epoxy radical, and (G) a titanium chelate catalyst. The composition has improved chemical resistance.

Description

Claims

1. An organopolysiloxane composition for magnesium alloy bonding, having improved chemical resistance, said composition comprising (A) 100 parts by weight of an organopolysiloxane having the general formula (1):

2. The organopolysiloxane composition of claim 1, wherein components (C) and (D) are present in a weight ratio C/D between 0.5 and 1.5.

3. The organopolysiloxane composition of claim 1, for use as automobile sealant.