Gelling esterified cellulose ethers

US10759874B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Oliver Petermann · Hamburg, DE
• Matthias Knarr · Nienburg/Weser, DE

Key dates

• Filing date: Mar 8, 2016
• Grant date: Sep 1, 2020
• Expiry date: Mar 22, 2036

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A23V2002/00
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

An esterified cellulose comprising aliphatic monovalent acyl groups and groups of the formula —C(O)—R—COOH, R being a divalent hydrocarbon group, has the following properties: i) the degree of neutralization of the groups —C(O)—R—COOH is not more than 0.4, ii) the total degree of ester substitution is from 0.03 to 0.38, and iii) the esterified cellulose ether has a solubility in water of at least 2.0 weight percent at 20° C.