Polydimethylsiloxane/MQ resin antifoaming compositions

Details Polydimethylsiloxane/MQ resin antifoaming compositions Polydimethylsiloxane/MQ resin antifoaming compositions

1988-12-07

1992-01-21

Stoll, Robert L.

Compositions

Preservative agents

Anti-corrosion

252358, 252308, 252312, B01D 1900, B01D 1904, B01J 1300

Patent

active

050825909

ABSTRACT:
Fluid organopolysiloxane antifoaming compositions, devoid of inorganic filler material and adopted for use in both nonaqueous and aqueous systems, for example detergent powders and liquids and crop-protection formulations, characteristically having a viscosity of less than 50,000 mPa.s at 25.degree. C., include (A) at least one substantially linear polydimethylsiloxane polymer, (B) a methylpolysiloxane resin comprising recurring structural units of the formulae R(CH.sub.3).sub.2 SiO.sub.0.5 and SiO.sub.2, wherein R is an alkyl radical containing from 1 to 3 carbon atoms, or a vinyl radical, with the ratio of the number of R(CH.sub.3).sub.2 SiO.sub.0.5 recurring units (M units) to the number of recurring SiO.sub.2 units (Q units) ranging from 0.4 to 1.2, and (C) a cyclic polydiorganosiloxane of the formulae: ##STR1## wherein the symbols R', which may be identical or different, are each a radical R or a hydrogen atom, and n is an integer ranging from 3 to 15.

REFERENCES:
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patent: 3408306 (1968-10-01), Boylan
patent: 3455839 (1969-07-01), Rauner
patent: 3865859 (1975-02-01), Plumb
patent: 4082690 (1978-04-01), Farminer
patent: 4104186 (1978-08-01), Caffarel et al.
patent: 4145308 (1979-03-01), Simoneau et al.
patent: 4324595 (1982-04-01), Kasprzak
patent: 4486336 (1984-12-01), Pape et al.
patent: 4685930 (1987-08-01), Kasprzak
patent: 4749740 (1988-06-01), Aizawa et al.
patent: 4788001 (1988-11-01), Narula

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