Polyoxyalkylene-modified polydimethylsiloxane antifoam compositions with two different polyoxyalkylene groups
US5271868A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1991 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Dec 27, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D19/0409
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is a silicone-based antifoam composition capable of exhibiting high defoaming activity even at a high temperature with excellent durability so as to be useful in dyeing processes. The composition comprises, as the principal ingredient, a polyoxyalkylene-modified polydimethylsiloxane, of which, different from conventional polyoxyalkylene-modified polydimethylsiloxanes, the polyoxyalkylene groups consist of two different types relative to the molar proportion of the oxyethylene units and oxypropylene units, in addition to a silicone oil compound of a silica filler, a poly(oxyethylene-oxypropylene) copolymer and low-molecular polydimethylsiloxane terminated at each molecular chain end with a dimethyl hydroxy silyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.