Patent · US Active

Process of preparing an esterified cellulose ether in the presence of an alkali metal carboxylate and an aliphatic carboxylic acid

US10730957B2 · kind B2 · utility

0Cited by

9References

14Claims

0Family size

Assignee

DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

Oliver Petermann · Hamburg, DE
Matthias Sprehe · Walsrode, DE
Warren K. Miller · Bend, US

Key dates

Filing date	Aug 15, 2013
Grant date	Aug 4, 2020
Priority date	—
Expiry date	Dec 2, 2034

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08B11/20
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

In a process for preparing an esterified cellulose ether a cellulose ether is esterified with (i) an aliphatic monocarboxylic acid anhydride or (ii) a dicarboxylic acid anhydride or (iii) a combination of an aliphatic monocarboxylic acid anhydride and a dicarboxylic acid anhydride in the presence of an alkali metal carboxylate and an aliphatic carboxylic acid, wherein the molar ratio [alkali metal carboxylate/anhydroglucose units of cellulose ether] is not more than [1.20/1] and the molar ratio [aliphatic carboxylic acid/anhydroglucose units of cellulose ether] is from [3.55/1] to [9.0/1].

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