Hart Chemical Limited

Frederick S Schell

Hugh J Shane

Brigitte H Licht

Roger T Bentley

Mohammad A Kasem

A novel low foaming non-ionic surfactant having good wetting properties has a molecular weight of about 1700 to about 2300 and the formula:

Low foaming surfactant

Defoamer compositions, from which particulate inorganic solids are substantially absent, are described for use in hot and cold stock pulp mill and paper mill applications. The compositions are water-emulsifiable to form stable emulsions for ease of application in use. The composition contains low viscosity mineral oils, an aliphatic diamide, silicone oil and an ethoxylated alkyl substituted phenol.

Water-emulsifiable defoamer composition

Water-dispersible defoamer compositions comprise an intimate blend of a mixture of defoaming components and at least one emulsifier to impart water-dispersibility to the composition. The defoaming components include a monoester of an alkenylated succinic acid, a particular organo-phosphorus compound and a silicone oil. The defoamer compositions have particular use in pulp mill defoaming compositions.

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Kitchener, Canada

Frederick S Schell