Patent · US Active

Composite polyamide membrane having azo content and high acid content

US9981227B2 · kind B2 · utility

0Cited by

148References

7Claims

0Family size

Assignee

DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

Mou Paul · Edina, US
Robert C. Cieslinski · Midland, US
Bruce B. Gerhart · Midland, US
David D. Hawn · Midland, US
XiaoHua Qiu · Midland, US
Mark Rickard · Midland, US
Steven Rosenberg · Shorewood, US
Abhishek Roy · Edina, US
Ian A. Tomlinson · Midland, US
Chengli Zu · Midland, US

Key dates

Filing date	Dec 15, 2014
Grant date	May 29, 2018
Priority date	—
Expiry date	Jul 1, 2035

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D2323/40
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A thin film composite polyamide membrane comprising a porous support and a thin film polyamide layer characterized by possessing: i) an azo (—N═N—) content of from 0.40% to 1.00%, as measured by pyrolysis gas chromatography; and ii) a dissociated carboxylate content of at least 0.40 mol/kg as measured by RBS at pH 9.5.

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