Fatty epoxide hydrophobized silica as antifoams in brownstock washing aids
US4332696A · kind A · utility
2Cited by
8References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 27, 1980 |
| Grant date | Jun 1, 1982 |
| Priority date | — |
| Expiry date | May 27, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D19/0404
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.