Anionic cellulose nitrate derivatives and aqueous dispersions thereof
AssigneeWolff Cellulosics GmbH & Co. KG
InventorsCarsten Hüttermann, Thomas Wagner, Klaus Nachtkamp
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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.
Claims10
An anionic cellulose nitrate derivative prepared by a process comprising esterifying cellulose nitrate with at least one dicarboxylic acid anhydride,
- wherein said anionic cellulose nitrate derivative 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.
A process of preparing an anionic cellulose nitrate derivative comprising esterifying cellulose nitrate with at least one dicarboxylic acid anhydride,
- wherein said anionic cellulose nitrate derivative 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.
An aqueous dispersion comprising:
- (a) at least one anionic cellulose nitrate derivative;
- and
- (b) at least one base,
- wherein said anionic cellulose nitrate derivative is prepared by a process comprising esterifying cellulose nitrate with at least one dicarboxylic acid anhydride, and further wherein said anionic cellulose nitrate derivative 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.
Dependencies are inferred from the claim text.