Patent · US Active

Defoamer formulation

US8426478B2 · kind B2 · utility

2Cited by

10References

13Claims

0Family size

Assignee

EVONIK DEGUSSA GMBH · DE

Inventors

Lara Dabrowski · Mannheim, DE
Frank Menzel · Oakland, US
Horst-Werner Wollenweber · Goldkronach, DE

Key dates

Filing date	Nov 24, 2008
Grant date	Apr 23, 2013
Priority date	—
Expiry date	Nov 24, 2028

Classification

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

Abstract

Formulation comprising hydrophobicized particles of silicon dioxide, mineral oil and one or more emulsifiers, where the hydrophobicized silicon dioxide is a fumed silicon dioxide, possesses a BET surface area of 200 to 300 m2/g, has on the surface of the particles O—Si—(CnH2n+1)3 groups, where n is 1 to 3 and where the (CnH2n+1) units are alike or different, has a carbon content of 1.5% to 5% by weight, based on the hydrophobic silicon dioxide, and is present in the formulation with a fraction of 0.05% to 5% by weight.

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