C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/1200, 400/13
C08L 83/04 (2006.01) C08J 3/03 (2006.01)
Patent
CA 1277073
METHOD FOR PRODUCING AN AQUEOUS SILICONE EMULSION COMPOSITION ABSTRACT According to the present invention, an aqueous silicone emulsion composition is produced as follows. A base emulsion is prepared from prescribed quantities of an essentially straight-chain organopolysiloxane with at least 2 silicon-bonded hydroxyl groups in each molecule, colloidal silica or alkali metal silicate, a curing catalyst, an emulsifier and water. After the pH is adjusted to 9 to 12 and ripened until an elastomer material is formed by the removal of water at room temperature, prescribed quantities of an epoxy-functional silane coupling agent or its partial hydrolysis product or its partial hydrolysis condensation product, a filler and a dispersant are added. The produced aqueous silicone emulsion composition bonds tightly to porous substrates in contact with it during curing and is therefore extremely useful as a coating or sealing material for various porous substrates.
506366
Kondo Hidetoshi
Koshii Taro
Dow Corning Toray Silicone Company Limited
Gowling Lafleur Henderson Llp
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