C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
6/212
C09C 1/28 (2006.01) C08G 77/02 (2006.01) C08K 9/06 (2006.01)
Patent
CA 1154202
METHOD FOR PRODUCING HYDROPHOBIC REINFORCING SILICA FILLERS AND FILLERS OBTAINED THEREBY Abstract Hydrophobic reinforcing silica fillers for silicone rubber are produced by the steps of mixing an alkyl silicate, preferably methyl orthosilicate, at least 70% of one-half of the stoichiometric amount of water required to hydrolyze the alkoxy radicals present in the alkyl silicate, an alcohol and at least 0.05 moles (per mole of theoretical SiO2 units present in the alkyl silicate) of a hydrophobe agent such as hexamethyl- disilazane together in the presence of a basic catalyst, said hydrophobe agent being added prior to the gelation of the mixture, and aging the mixture to obtain a composition containing a hydrophobic reinforcing silica filler for silicone rubber. Preferably, the hydrophobe agent is added prior to or concurrently with the addition of the alkyl silicate. Vulcanized silicone rubbers possessing tensile strengths in excess of 12.4 megapascals and tear strengths of greater than 31 kiloNewtons/meter can be prepared using the above fillers.
375764
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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