Grinding process for high viscosity cellulose ethers
US4820813A · kind A · utility
52Cited by
6References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 12, 1988 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Feb 12, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2301/26
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
High viscosity cellulose ether products are produced by grinding a substantially dry high molecular weight cellulose ether under conditions of mild mechanical impact such as those encountered in a high speed air swept impact mill. It has been found that such a cellulose ether product has several times the intrinsic viscosity of a product of substantially equivalent particle size by ball mill or hammer mill grinding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.