Method for reducing the quantity of siloxane oligomer in organop

Plastic and nonmetallic article shaping or treating: processes – With step of cooling to a temperature of zero degrees c. or...

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264 83, 264 85, 264344, B29C 7100

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051678837

ABSTRACT:
A method of improving the efficient depletion of the siloxane oligomer present in organopolysiloxane moldings by using supercritical carbon dioxide gas, so that this reduction in siloxane oligomer content is accomplished without cracking of the moldings by regulating the pressure reduction to less than 40 Kg/cm.sup.2 per 1 hour during the release to atmospheric pressure.

REFERENCES:
patent: 4308799 (1982-01-01), Kitagawa et al.
European Search Report, dated Aug. 27, 1991, for European Application No. 90 12 5696.
Supercritical Fluids, Yilgor et al., Polymer Bulletin 12, (1984) pp. 491-497.

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