Defoaming agent
US9345991B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 2011 |
| Grant date | May 24, 2016 |
| Priority date | — |
| Expiry date | Jan 21, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D19/0413
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides a defoaming agent containing, as essential components, hydrophobic dry silica (S) prepared by hydrophobizing silica prepared using a dry process and having a primary particle diameter of 5 to 100 nm, water, and a hydrophobic liquid (Q) containing 1 to 25% by weight of an ester compound (E) represented by the following formula, (R1—COO)p-D, wherein R1 denotes an alkyl group or an alkenyl group; D denotes a residue resulting from the removal of a hydroxyl group contributing to an ester linkage from a compound (D′) containing 2 to 6 carbon atoms and 1 to 6 hydroxyl groups or a residue resulting from the removal of a hydroxyl group contributing to an ester linkage from an adduct prepared by adding an alkylene oxide to the compound (D′); and p denotes an integer from 1 to 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.