Controlling viscosity of silica-silicone oil gels

Details Controlling viscosity of silica-silicone oil gels Controlling viscosity of silica-silicone oil gels

1975-01-20

1976-08-31

Pitlick, Harris A.

Compositions

Physical separation agents

210DIG23, 252316, C09K 300

Patent

active

039779823

ABSTRACT:
The viscosity of a silica-silicone oil gel-like composition useful as a partitioning substance in blood collection tubes can be controlled by first preparing a mixture of a silicone oil and silica particles to form a mixture having a viscosity greater than about 200,000 centistokes, reacting the mixture in an evacuated environment at a temperature ranging from about 175.degree. to 550.degree.C. for a period of time sufficient to reduce the viscosity below about 120,000 centistokes, and then adding a network former to the reaction mixture in a quantity sufficient to increase the viscosity to a range of about 200,000 to 600,000 centistokes, preferably to a range of about 350,000 to 450,000 centistokes.

REFERENCES:
patent: 3780935 (1973-12-01), Lukacs et al.
patent: 3852194 (1974-12-01), Zine

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