Solid silicone defoaming agent and method for its production
US4719034A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1985 |
| Grant date | Jan 12, 1988 |
| Priority date | — |
| Expiry date | Nov 25, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D19/0404
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A solid defoaming composition, and a process for making the composition, is described. The defoaming composition comprises a solid nonionic surfactant, selected from aliphatic esters of glycerol and propylene glycol; a solid, water-soluble polymer, selected from carboxyvinyl polymers and poly(vinyl alcohol)s; and a silicone composition, composed of a fine silica powder and a silicone oil having a viscosity of at least 100 cS at 25.degree. C. A molded cake of the composition of this invention does not bleed silicone oil and may be employed to defoam aqueous systems for extended periods without the need to replenish the active ingredient. The composition is particularly useful for defoaming septic tanks and sewage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.