C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
253/136, 402/20,
C08J 3/24 (2006.01) C08G 77/20 (2006.01) C08K 5/14 (2006.01)
Patent
CA 1092278
ABSTRACT OF THE DISCLOSURE A hydraulic elastomer having a viscosity of 1,000 to 1,000,000 centi- poises at 25°C. is provided herein which is composed of a polydimethylsilox- ane cross-linked by three-carbon bridges, having a relatively high cross- link density of from 0.25 to 0.50 cross-links per 100 silicon atoms, and in which there are from 0.074 to 0.74 free chain ends per 100 silicon atoms, the free ends having an average of from 50 to 100 silicon atoms each, the elastomer being characterized by a Shore A hardness of from 9 to 15, and being further characterized by its ability to absorb energy by flowing under pressure like a fluid. It is made by heating a particularly reacted silicone fluid, containing approximately 0.45 mole percent of methylvinylsiloxane units, with a vinyl-specific peroxide. This elastomer has a high cross-link density and a high proportion of free chain ends. Because of these char- acteristics it crumbles to a powder under high ahear stress, but has the unique property of flowing like a viscous fluid through a narrow orifice. It is useful in hydraulic impact absorbers and other hydraulic systems.
321952
Marcus & Associates
Stauffer Chemical Company
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