Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-10-29
2000-10-10
Moore, Margaret G.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523213, 523209, 524588, C08K 906
Patent
active
061302724
ABSTRACT:
A process for making a flowable powdered base suitable for use in the formulation of liquid silicone rubber compositions that can be cured to form silicone elastomers. The process comprises (A) fluidizing a reinforcing silica filler in a high-shear mixer, (B) maintaining the content of the mixer at a temperature below about 60.degree. C. while adding to the mixer a silylating agent, a nitrogen containing compound to facilitate the silylation reaction, and water thereby forming an essentially homogeneous mixture comprising a treated reinforcing silica filler; (C) adding a polydiorganosiloxane having a viscosity of about 0.03 to 300 Pa.s at 25.degree. C. to the mixer and forming a flowable powdered base having an average particle size of from about 1 to 1000 microns, and (D) heating the flowable powdered base under conditions sufficient to remove volatiles.
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Dopp Steven F.
Griffith Phillip Joseph
Jensen Jary David
Reese Herschel Henry
Boley William F.
Dow Corning Corporation
Moore Margaret G.
Warren Jennifer S.
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