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AssigneeTh. Goldschmidt AG
InventorsHans-Ferdi Fink, Herwig Fritsch, Gotz Koerner, Gerd Rossmy, Gunter Schmidt
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In the disclosed method of preventing the formation of foam and destroying existing foam in an aqueous solution or dispersion, an effective amount of a composition comprising about 0.2 to 7.5 percent by weight of highly disperse silica or alumina with the balance being methylpolysiloxanepolyoxyalkylene mixed block polymer consisting essentially of A. about 10-60 percent by weight of methylpolysiloxane; B. with the balance polyoxyalkylene, > 80-100 percent by weight of the polyoxyalkylene block consisting of oxypropylene units, Is added to the solution or dispersion. The application also discloses defoaming preparations or compositions of finely disperse silica or alumina and methylpolysiloxane-polyoxyalkylene mixed block polymer which may be diluted in oily substances. The preparation may optionally comprise non-ionogenic emulsifier of an HLB value of 8 to 14.
In a method for preventing the formation of foam and destroying existing foam in an aqueous solution or dispersion wherein an effective amount of defoaming composition composed of an oil, highly dispersed silica and a defoaming substance of a polyoxyalkylene-polysiloxane block copolymer is used, the improvement which comprises said block copolymer consisting essentially of
In a defoaming composition of the type composed of an oil, highly dispersed silica and a defoaming substance of a polyoxyalkylene-polysiloxane block copolymer, the improvement which comprises said block copolymer consisting essentially of
Dependencies are inferred from the claim text.