Preparation of polysiloxane block polymers and their use as...

Details Preparation of polysiloxane block polymers and their use as... Preparation of polysiloxane block polymers and their use as...

B - Operations, Transporting

01

D

400/2006, 400/30

B01D 19/04 (2006.01) C08G 77/44 (2006.01) C08K 3/36 (2006.01)

Patent

CA 1167463

ABSTRACT This invention is directed to a method of preparing block copolymers useful as foam inhibitors, which method comprises the steps of: (1) mixing (a) from 100 parts by weight of a polydi- methylsiloxane that is liquid at 20°C, and (b) from about 2 to 20 parts by weight of a spatially cross- linked polysiloxane resin with a molecular weight of from about 1000 to 10,000; (2) heating said mixture in the presence of a cata- lyst until the viscosity is at least 200 mPa.s, as measured at 20°C, to form a block polymer; (3) mixing said block polymer with (c) from about 0.5 to 15 parts by weight of a silicon dioxide aerogel; and (4) heating the mixture from step (3).

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