C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
400/5311, 400/72
C08K 9/06 (2006.01) C08L 83/04 (2006.01) C09C 1/30 (2006.01)
Patent
CA 1335018
An improved method of producing treated silica filler for use with silicone rubber operates at ambient temperature in a short period of time. The method consists essentially of mixing reinforcing silica with a volatile treating agent of the formula RxSi(OR')4-x, wherein R is a substituted or unsubstituted, saturated or unsaturated, alkyl or aryl radical having from 1 to 6 carbon atoms, R' is an alkyl radical having from 1 to 3 carbon atoms, x is 1 or 2 and R and R' are chosen so that the vapor pressure of the alkoxysilane exceeds 10 Pa (0.0001 atmosphere) at treatment temperature, in combination with a volatile catalyst selected from the group consisting of acid A, base B and mixtures thereof; wherein acid A is a volatile acid or acid progenitor and base B is a silylamine or silazane, acid A and base B being chosen so that the vapor pressure of either acid A or base B exceeds 500 Pa (0.005 atmosphere) at treatment temperature, for a period of time sufficient to allow the desired amount of treating agent to be adsorbed onto the surface of the particulate filler.
597496
Collins Warde Thomas
Cottrell Kenneth Ray
Saam John Carlton
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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