C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
400/7204
C08J 3/02 (2006.01) C08G 77/06 (2006.01) C08G 77/08 (2006.01)
Patent
CA 1276356
METHOD OF PRODUCING REINFORCED AQUEOUS EMULSION OF POLYDIORGANOSILOXANE Abstract The invention is a method of producing a colloidal silica reinforced polydiorganosiloxane fluid in aqueous emulsion. The method combines an acidic aqueous colloidal silica sol and low molecular weight hydroxyl endblocked polydiorganosiloxane with anionic emulsifying agent, then homogenizes the mixture to form an emulsion. Because the water in the colloidal silica sol is used to supply water for the emulsion, it is possible to produce emulsions with solid content as high as 80 percent by weight. The emulsion is then mixed with surface active anionic catalyst and aged at room temperature to allow the polydiorganosiloxane to polymerize. Polymerization is halted by adding base to bring siloxane emulsion can be further mixed with diorganotindicar- boxylate and aged to give a curable emulsion which yields an elastomer upon removal of the water. A curable emulsion can also be produced by mixing the reinforce polydiorgano- siloxane emulsion with diorganotindicarboxylate and alkyl- orthosilicate.
506821
Huebner David Joel
Landis Julie Kay
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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