C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 83/07 (2006.01) C08K 9/06 (2006.01) C08L 83/04 (2006.01)
Patent
CA 2153188
A method for preparing organopolysiloxane bases characterized by high levels of fillers. We have found that by mixing the components of the base at a temperature of 60°C. or below for a time period sufficient to effect essentially a homogeneous blend, a base composition is formed which can be further blended with a platinum group metal- containing catalyst, an organohydrogensiloxane and, optionally, an inhibitor to form a curable liquid silicone rubber (LSR) composition. The curable LSR composition has improved flow characteristics and shelf life when compared to similar materials where the base is prepared at temperatures above 60°C. The improved flow characteristics allow larger quantities of fillers to be incorporated into our curable LSR composition while still maintaining acceptable flow characteristics. Silicone elastomers prepared from these compositions have improved swell and degradation resistance to oils, lower compression set values and improved tear, elongation and tensile values without requiring post cure procedures.
Conway Lori Jean
Gray Thomas Edward
Griffith Phillip Joseph
Schulz William James Jr.
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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