Particulate foam control agents and their use
AssigneeDow Corning S. A.
InventorsLeonidas Kolaitis, Bertrand Louis Julien Lenoble
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Abstract
A method of providing a foam control agent with 1 to 30 parts of a silicone antifoam and 70 to 99 parts of a zeolite carrier, with the ability to release some of the antifoam within 10 minutes of being dispersed in an aqueous surfactant solution, by depositing 5 to 70% of the antifoam of an organopolysiloxane polyoxyalkylene copolymer, onto the zeolite carrier not later than depositing the silicone antifoam. Also claimed is the use of the copolymer to achieve that end and compositions where the antifoam is branched or high viscosity. Also claimed is encapsulated agents.
Claims7
A foam control agent comprising (A) from 1 to 30 parts by weight of a silicone antifoam which consists of (i) from 70 to 99% by weight of a polyorganosiloxane polymer, selected from the group consisting of (a) linear polydiorganosiloxane polymers having a viscosity of more than 12,500 mm.sup.2 /s at 25.degree. C. and (b) branched polyorganosiloxanes and (ii) from 1 to 30% by weight of a filler material which has its surface made hydrophobic, (B) from 70 to 99 parts by weight of a zeolite and (C) an organopolysiloxane polyoxyalkylene copolymer in an amount which is from 5 to 70% by weight of antifoam (A).
Dependencies are inferred from the claim text.