Patent · US Expired

Anionic cellulose nitrate derivatives and aqueous dispersions thereof

US7071326B2 · kind B2 · utility

0Cited by

4References

10Claims

0Family size

Assignee

Wolff Cellulosics GmbH Co. KG · DE

Inventors

Carsten Huttermann · Braunschweig, DE
Thomas Wagner · Konstanz, DE
Klaus Nachtkamp · Cologne, DE

Key dates

Filing date	Nov 30, 2005
Grant date	Jul 4, 2006
Priority date	—
Expiry date	Nov 30, 2025

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2301/18
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

An anionic cellulose nitrate derivative is described, which has: (i) a degree of acid group substitution (DS (acid)) in the range of 0.01 to 0.2; and (ii) a nitrogen content of 10.7 wt. % to 12.3 wt. %, based on the weight of cellulose nitrate derivative. The anionic cellulose nitrate derivative is prepared by a process which includes esterifying cellulose nitrate feed material with at least one dicarboxylic acid anhydride (e.g., maleic anhydride). Aqueous dispersions according to the present invention include: (a) at least on anionic cellulose nitrate derivative according to the present invention; and (b) at least one base.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.