Water-soluble defoaming agents
US4042528A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1975 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | Mar 25, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D19/0404
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Defoaming agent comprising 20 to 94% by weight of an organopolysiloxane-polyoxyalkylene copolymer in which the polyoxyalkylene group is bonded to a silicon atom directly through the Si--C linkage, the ratio of the polyoxyalkylene group to the copolymer being in the range of from 0.3 to 0.8 by weight, 5 to 50% by weight of a polyoxyalkyleneglycol derivative, and 1 to 30% by weight of a nonionic surfactant having the polyoxyalkylene structure in its molecule. The defoaming agents have excellent properties of solubility in water, durability of anti-foaming activity and stability to alkalinity. They are useful for reducing the formation of foams particularly in a high-temperature dyeing bath.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.