Fatty epoxide hydrophobized silica as antifoams in brownstock wa

Details Fatty epoxide hydrophobized silica as antifoams in brownstock wa Fatty epoxide hydrophobized silica as antifoams in brownstock wa

1980-05-27

1982-06-01

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

106308F, 252358, 427220, 427386, B01D 1904, B05D 302, B05D 700

Patent

active

043326960

ABSTRACT:
An improved aqueous defoamer composition of the type comprising from 70-90% by weight of a water-insoluble organic liquid, from 0.1 to about 20% of a hydrophobic silica suspended in the organic liquid, and from about 1 to about 20% of an oil-soluble spreading agent, the improvement which comprises utilizing as the hydrophobic silica a silica which has at least a portion of its surface esterified with a fatty epoxide.
The invention also contemplates an improved method for hydrophobizing silica particles by reacting them in an organic liquid with a fatty epoxide.

REFERENCES:
patent: 2657149 (1953-10-01), Iler
patent: 2776910 (1957-01-01), Erickson et al.
patent: 3076768 (1963-02-01), Boylan
patent: 3304266 (1967-02-01), Sullivan
patent: 3408306 (1968-10-01), Boylan
patent: 3887487 (1975-06-01), Camp et al.
patent: 3923683 (1975-12-01), Michalski et al.
patent: 4021365 (1977-05-01), Sinka et al.

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