Catalysts
AssigneeImperial Chemical Industries PLC
InventorEdward K. Pierpoint
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Abstract
A platinum catalyst which comprises the admixture of of (a) a haloplatinum compound (b) an aliphatically unsaturated organosiloxane compound and (c) an aluminium alkoxide. These catalysts give high activity in promoting reactions of Si-H compounds with unsaturated groups of Si-OH. They are valuable in producing cured organopolysiloxanes such as release coatings. They are characterized by storage stability and freedom from corrosion of metallic containers.
Claims6
In an improved platinum catalyst of the type resulting from the admixture of a haloplatinum compound and an aliphatically unsaturated organosiloxane compound, the improvement which comprises the inclusion of an aluminium alkoxide.
A platinum catalyst comprising the admixture of (a) a haloplatinum compound selected from chloroplatinic acid or alkali metal salt thereof;
- PtCl.sub.4, PtCl.sub.2, H.sub.2 PtCl.sub.4 and its salts;
- complexes of platinous chloride and olefins or dialkyl sulphides or the analogous bromo compounds of any of the aforementioned chloro compounds;
- (b) an organopolysiloxane containing one or more vinyl or allyl groups;
- and (c) an aluminum alkoxide.
Dependencies are inferred from the claim text.