Aqueous suspension of a cellulose ether, method for the production thereof, and a dry blend
US6639066B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2001 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Dec 20, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2301/26
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to a suspension of a water-soluble, nonionic cellulose ether having a fairly low content of an electrolytic salt exhibiting a high stability and a low viscosity. The suspension having a pH-value of below 8.0, contains 10-30% by weight of a water-soluble, nonionic cellulose ether, and 10-22% by weight of an electrolytic salt, wherein the electrolytic salt containsa) 10-90% by weight of a salt of polyphosphate having 3-12 phosphate groups, andb) 10-90% by weight of a salt selected from the group consisting of ortophosphate, pyrophosphate, sulphate, carbonate and a mixture thereof. The suspension is advantageously produced by adding a dry blend containing the water-soluble cellulose ether in cross-linked form and the electrolytic salt to water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.