Antifoam composition
US4690713A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1985 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Jan 24, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D19/0409
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The antifoam composition provided by the invention comprises (a) 100 parts by weight of a hydrocarbon oil, e.g. spindle oil, or a silicone fluid, e.g. polydimethylsiloxane fluid, having a viscosity of 20 to 1,000,000 centistokes at 25.degree. C., (b) 0.1 to 40 parts by weight of an organosilane compound having 1 to 3 hydroxy groups or hydrolyzable groups, e.g. alkoxy, acyloxy and alkenyloxy groups, (c) 1 to 40 parts by weight of a finely divided silica powder and, optionally, (d) up to 5 parts by weight of a catalyst. The antifoam composition can exhibit excellent and durable defoaming activity even under vigorous agitation or in an alkaline condition of the foaming liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.