Dow Corning S.a.

Mark A Prince

Bertrand Louis Lenoble

Leonidas Kolaitis

Jan Sybren Hoogland

Bernhard Ernst Gold

Pierre Andre Germain

A method of making a particulate foam control agent comprising 0.001 to 30 parts of silicone antifoam, 45 to 99 parts of a zeolite and 0 to 30 parts of a binder, preferably of a polycarboxylate-type, able to release at least some antifoam from the zeolite in the first 10 minutes of a washing cycle comprises depositing from 0.1 to 500% of the silicone antifoam of an organic surfactant onto the zeolite not later than depositing the silicone antifoam, at least 1 part of surfactant being used per 100 parts of the foam control agent. Also covered are detergent compositions and some foam control agents.

Particulate foam control agents and their use

A particulate foam control agent comprises 1 to 30 parts silicone antifoam, 70 to 99 parts zeolite carrier, 1 to 60% of the antifoam of an organopolysiloxane polyoxyalkylene copolymer, deposited onto the zeolite carrier not later than the antifoam and 1 to 40 parts by weight of a polycarboxylate-type binder or encapsulant. This combination give good release in early stages, storage stability and powder characteristics.

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Overijse, Belgium

Mark A Prince