Composite polyamide membrane made using substituted benzamide monomer

Patent metadata

Field	Value
Publication number	US-9895666-B2
Application number	US-201414648849-A
Country	US
Kind code	B2
Filing date	Jan 3, 2014
Priority date	Jan 14, 2013
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

A method for making a composite polyamide membrane comprising a porous support and a thin film polyamide layer, wherein the method includes the steps of applying a polar solution comprising a polyfunctional amine monomer and a non-polar solution comprising a polyfunctional acyl halide monomer to a surface of a porous support and interfacially polymerizing the monomers to form a thin film polyamide layer. The method is characterized by including a substituted benzamide monomer within the non-polar solution.

First claim

The invention claimed is:

1. A method for making a composite polyamide membrane comprising a porous support and a thin film polyamide layer, wherein the method comprises the steps of applying a polar solution comprising a polyfunctional amine monomer and a non-polar solution comprising a polyfunctional acyl halide monomer to a surface of a porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, wherein the method is characterized by including a substituted benzamide monomer within the non-polar solution, wherein the substituted benzamide monomer is distinct from the polyfunctional acyl halide monomer and is represented by at least one of Formulae (IIIa and IIIb):

wherein: i) X, X′, X″ and X′″ are independently selected from the following functional groups: acyl halide, carboxylic acid, carboxylate and sulfonic acid which are located meta, ortho or para to the benzyl amide group, or one or both of: a) X and X′, and b) X″ and X′″ collectively form an anhydride group; with the proviso that at least two of X, X′, X″ and X′″ are selected from acyl halide and anhydride functional groups; and
ii) Z is selected from at least one of: aryl, alkyl, alkenyl, and alkoxy wherein each may be unsubstituted or substituted with a functional group selected from: carboxylic acid, carboxylate, phosphonic acid and sulfonic acid;
iii) with the proviso that the substituted benzamide monomer comprises at least one functional group selected from carboxylic acid, carboxylate, phosphonic acid and sulfonic acid.

2. The method of claim 1 wherein the substituted benzamide monomer comprises at least three phenyl groups.

3. The method of claim 1 wherein at least three of X, X′, X″ and X′″ are acyl halide functional groups.

4. The method of claim 1 wherein the substituted benzamide monomer has a molecular weight of from 370 to 900 Daltons.

Assignees

• Dow Global Technologies Llc

Inventors

• Roy Abhishek
• Arrowood Tina L
• Desai Aman A
• Jons Steven D
• Paul Mou
• Qiu Xiaohua
• Rosenberg Steven
• Tomlinson Ian A

Classifications

• B01D61/02

  Reverse osmosis; Hyperfiltration {; Nanofiltration} · CPC title

• C09D177/00

  Coating compositions based on polyamides obtained by reactions forming a carboxylic amide link in the main chain (based on polyhydrazides C09D179/06; based on polyamide-imides C09D179/08); Coating compositions based on derivatives of such polymers · CPC title

• B01D69/125

  In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction · CPC title

• B01D71/56 Primary

  Polyamides, e.g. polyester-amides · CPC title

• B01D71/78

  Graft polymers · CPC title