Water-soluble defoaming agents

Details Water-soluble defoaming agents Water-soluble defoaming agents

1975-03-25

1977-08-16

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

8 91, 8 92, 8 93, 252321, 423232, B01D 1904

Patent

active

040425282

ABSTRACT:
Defoaming agent comprising 20 to 94% by weight of an organopolysiloxane-polyoxyalkylene copolymer in which the polyoxyalkylene group is bonded to a silicon atom directly through the Si--C linkage, the ratio of the polyoxyalkylene group to the copolymer being in the range of from 0.3 to 0.8 by weight, 5 to 50% by weight of a polyoxyalkyleneglycol derivative, and 1 to 30% by weight of a nonionic surfactant having the polyoxyalkylene structure in its molecule. The defoaming agents have excellent properties of solubility in water, durability of anti-foaming activity and stability to alkalinity. They are useful for reducing the formation of foams particularly in a high-temperature dyeing bath.

REFERENCES:
patent: 2753309 (1956-07-01), Figdor
patent: 3180836 (1965-04-01), Jursich
patent: 3250727 (1966-05-01), Noll et al.
patent: 3784479 (1974-01-01), Keil
patent: 3846329 (1974-11-01), Householder et al.

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