Water-soluble esterified cellulose ethers

US10377835B2 · 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: Aug 13, 2019
• Expiry date: Mar 8, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D101/32
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

1. An esterified cellulose ether which i) comprises groups of the formula —C(O)—R—COOH or a combination of aliphatic monovalent acyl groups and groups of the formula —C(O)—R—COOH, wherein R is a divalent hydrocarbon group, ii) has a weight average molecular weight Mw of up to 70,000 Dalton, iii) has a degree of neutralization of the groups —C(O)—R—COOH of not more than 0.4, and iv) has a solubility in water of at least 2.0 weight percent at 2° C., is useful for preparing enteric capsules.