Patent · US Active

Cellulose ethers and their use

US9394376B2 · kind B2 · utility

0Cited by

9References

13Claims

0Family size

Assignee

DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

Roland Adden · Bad Fallingbostel, DE
Meinolf Brackhagen · Walsrode, DE
Matthias Knarr · Nienburg/Weser, DE
Jin Zhao · Framingham, US

Key dates

Filing date	Oct 6, 2011
Grant date	Jul 19, 2016
Priority date	—
Expiry date	Apr 19, 2033

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61J3/077
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

Cellulose ethers are described herein which are useful in capsules or in coatings for dosage forms. In these cellulose ethers the ether substituents are methyl groups, hydroxyalkyl groups, and optionally alkyl groups being different from methyl, the cellulose ether has an MS (hydroxyalkyl) of 0.05 to 1.00, and hydroxy groups of anhydroglucose units are substituted with methyl groups such that [s23/s26−0.2*MS(hydroxyalkyl)] is 0.35 or less, wherein s23 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 3-positions of the anhydroglucose unit are substituted with methyl groups and wherein s26 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups.

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