Patent · US Active

Esterified cellulose ethers of very high molecular weight

US9890220B2 · kind B2 · utility

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3References

20Claims

0Family size

Assignee

DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

Oliver Petermann · Hamburg, DE
Meinolf Brackhagen · Walsrode, DE
Matthias Sprehe · Walsrode, DE

Key dates

Filing date	Feb 28, 2014
Grant date	Feb 13, 2018
Priority date	—
Expiry date	Feb 28, 2034

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61K9/2866
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

Esterified cellulose ethers which comprise (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 divalent aliphatic or aromatic hydrocarbon group and A is hydrogen or a cation, which have a viscosity of up 50 mPa·s, measured as a 10 wt % solution of the esterified cellulose ether in acetone at 20° C., and a weight average molecular weight Mw of at least 220,000 Dalton, or which have a viscosity of up 100 mPa·s, measured as a 10 wt % solution of the esterified cellulose ether in acetone at 20° C., and a weight average molecular weight Mw of at least 310,000 Dalton are useful for preparing solid dispersions comprising drugs.

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