Patent · US Active

Esterified cellulose ethers of very low viscosity

US9617351B2 · kind B2 · utility

0Cited by

4References

13Claims

0Family size

Assignee

DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

Oliver Petermann · Hamburg, DE
Robert B. Appell · Midland, US
Meinolf Brackhagen · Walsrode, DE

Key dates

Filing date	Feb 28, 2014
Grant date	Apr 11, 2017
Priority date	—
Expiry date	Feb 28, 2034

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61K9/4816
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

An esterified cellulose ether which comprises (i) aliphatic monovalent acyl groups or (ii) groups of the formula —C(O)—R—COOA, wherein R is a divalent aliphatic or aromatic hydrocarbon group and A is hydrogen or a cation, or (iii) a combination of aliphatic monovalent acyl groups and groups of the formula —C(O)—R—COOA, and which has a) a viscosity of from 1.2 to 1.8 mPaos, measured as a 2.0 wt % solution of the esterified cellulose ether in 0.43 wt % aqueous NaOH at 20° C., or b) a viscosity of up to 5 mPa·s, measured as a 10 wt % solution of the esterified cellulose ether in acetone at 20° C., or c) a combination of the viscosities of a) and b), is useful for preparing solid dispersions comprising drugs.

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