Solid silicone defoamer
US4961877A · kind A · utility
9Cited by
9References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1988 |
| Grant date | Oct 9, 1990 |
| Priority date | — |
| Expiry date | Aug 30, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D19/0409
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A solid silicone defoaming agent which includes a mixture of silicone oil having a viscosity of at least 20 centistokes at 25 degrees Centigrade and microparticulate silica, a copolymer selected from the group consisting of polyoxyalkylene and polyoxyalkylene/polysiloxane copolymers, and a wax selected from the group consisting of a water-insoluble wax which is insoluble in water at room temperature and which has a melting point of at least 35 degrees Centigrade, and a water-soluble wax which dissolves and disperses in water at room temeprature and which has a melting point of at least 30 degrees Centigrade.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.