Patent · US Active

Partially cross-linked esterified cellulose ethers

US9745387B2 · kind B2 · utility

0Cited by

4References

15Claims

0Family size

Assignee

DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

Meinolf Brackhagen · Walsrode, DE
Nicholas S. Grasman · Midland, US
Yongfu Li · Wuxi, CN
David M. Meunier · Midland, US
Oliver Petermann · Hamburg, DE
Matthias Sprehe · Walsrode, DE

Key dates

Filing date	Aug 15, 2013
Grant date	Aug 29, 2017
Priority date	—
Expiry date	Nov 30, 2033

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61K9/146
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

A partially cross-linked esterified cellulose ether having A) groups of the formula —C(O)—R—COOA or 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, and B) having a molecular weight distribution such that [Wf(>100 k)−Wf(>100 k)XL]/Wf(>100 k)XL is at least 0.20, wherein Wf(>100 k) is the total weight fraction of the esterified cellulose ether that exceeds 100,000 g/mol, and Wf(>100 k)XL is the weight fraction that exceeds 100,000 g/mol of the methylated esterified cellulose ether is useful as enteric polymer for pharmaceutical dosage forms.

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