Patent · US Expired

Anti-foam formulation containing an organopolysiloxane

US4405490A · kind A · utility

14Cited by

4References

6Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Joachim Maas · Griesheim, DE
Helmut Steinberger · Leverkusen, DE
Hans-Heinrich Moretto · Cologne, DE

Key dates

Filing date	Mar 30, 1981
Grant date	Sep 20, 1983
Priority date	—
Expiry date	Mar 30, 2001

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D19/0404
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

An anti-foam composition comprising PA1 (a) a dispersion of a silicon dioxide filler in an organopolysiloxane, PA1 (b) an emulsifier or dispersant, and PA1 (c) at least one water soluble compound selected from the group consisting of PA2 (i) a divalent aliphatic alcohol containing 4 to 10 carbon atoms, PA2 (ii) a trivalent aliphatic alcohol containing 2 to 10 carbon atoms, and ##STR1## in which R.sub.1 and R.sub.2 each independently is hydrogen, C.sub.1-8 -alkyl or C.sub.1-8 -alkyl-CO-, and PA1 n,m,p and r are so chosen that the molecular weight of (c) does not exceed 499. Advantageously, based upon (a) plus (b) plus (c) the composition by weight comprises about 25 to 35% (a), about 8 to 12% (b) and about 53 to 67% (c), the composition additionally containing water in up to about 45% by weight of the entire composition. The composition is more readily water-dispersible and of better anti-foaming action than heretofore.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.