Patent · US Active

Melt-extruded composition comprising a cellulose ether

US9364546B2 · kind B2 · utility

1Cited by

1References

16Claims

0Family size

Assignee

DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

Nicholas S. Grasman · Midland, US
True L. Rogers · Midland, US
Oliver Petermann · Hamburg, DE
Meinolf Brackhagen · Walsrode, DE
Roland Adden · Bad Fallingbostel, DE

Key dates

Filing date	Apr 8, 2013
Grant date	Jun 14, 2016
Priority date	—
Expiry date	May 20, 2033

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29K2105/0035
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

A melt-extruded polymer composition comprising a) at least one cellulose ether, b) one or more active ingredients and c) one or more optional additives, wherein said at least one cellulose ether has an MS (hydroxyalkyl) of 0.05 to 0.55 and hydroxyl groups of anhydroglucose units are substituted with methyl groups such that [s23/s26−0.2*MS(hydroxyalkyl)] is 0.32 or less, wherein s23 is the molar fraction of anhydroglucose units wherein only the two hydroxyl groups in the 2- and 3-positions of the anhydroglucose unit are substituted with a methyl group and wherein s26 is the molar fraction of anhydroglucose units wherein only the two hydroxyl groups in the 2- and 6-positions of the anhydroglucose unit are substituted with a methyl group.

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