Process for producing dispersion of esterified cellulose ether

US10450424B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Meinolf Brackhagen · Walsrode, DE
• Neal J. Fetner · Midland, US
• Matthias Knarr · Nienburg/Weser, DE
• Jin Zhao · Framingham, US

Key dates

• Filing date: Jul 8, 2016
• Grant date: Oct 22, 2019
• Expiry date: Jul 8, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2301/32
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A process for producing an aqueous composition comprising a dispersed esterified cellulose ether comprises the steps of grinding, in the presence of an aqueous diluent an esterified cellulose ether comprising (i) groups of the formula —C(O)—R—COOA or (ii) a combination of aliphatic monovalent acyl groups and groups of the formula —C(O)—R—COOA, wherein R is a N divalent aliphatic or aromatic hydrocarbon group and A is hydrogen or a cation, blending a salt of a fatty acid with the esterified cellulose ether and choosing the amounts of aqueous diluent, esterified cellulose ether and salt of a fatty acid that the produced aqueous composition comprises at least 20 percent of the dispersed esterified cellulose ether and heating the aqueous composition to a temperature of from 37 to 80 C during or after the grinding step.