Patent · US Active

Process of preparing an ester of a cellulose ether

US9453081B2 · kind B2 · utility

2Cited by

6References

15Claims

0Family size

Assignee

DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

Matthias Sprehe · Walsrode, DE
Oliver Petermann · Hamburg, DE
Robert B. Appell · Midland, US

Key dates

Filing date	Mar 12, 2013
Grant date	Sep 27, 2016
Priority date	—
Expiry date	Mar 12, 2033

Classification

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

Abstract

A reaction product mixture is obtained from a reaction of (a) a cellulose ether with (b) an aliphatic monocarboxylic acid anhydride or with a di- or tricarboxylic acid anhydride or with a combination of an aliphatic monocarboxylic acid anhydride and a di- or tricarboxylic acid anhydride in the presence of (c) an aliphatic carboxylic acid. A process for precipitating an esterified cellulose ether from this reaction product mixture comprises the step of contacting the reaction product mixture with water and subjecting the combination of water and the reaction product mixture to a shear rate of at least 800 s−1. The precipitated esterified cellulose ether can be recovered as a non-tacky product.

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