Amphiphilic diblock copolymer and use of same for producing polymeric filter membranes

Patent metadata

Field	Value
Publication number	US-10987639-B2
Application number	US-201716073855-A
Country	US
Kind code	B2
Filing date	Feb 1, 2017
Priority date	Feb 1, 2016
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

Provided is a an amphiphilic diblock copolymer including from 40 to 60% by weight, relative to the weight of the copolymer, of a hydrophilic block including a unit derived from an n-butyl acrylate monomer and a derived from a hydroxyethyl methacrylate monomer. The copolymer also includes from 40 to 60% by weight, relative to the weight of the copolymer, of a hydrophobic block including at least one unit derived from a methyl methacrylate monomer. Also provided is a polymeric membrane that includes the block copolymer and a hydrophobic polymeric matrix. This membrane is useful for treating an effluent, for example, water.

First claim

The invention claimed is:

1. An amphiphilic diblock copolymer consisting of:
50% by weight, relative to the weight of the copolymer, of a hydrophilic block consisting of:
77% by weight of units derived from an n-butyl acrylate monomer, relative to the weight of said hydrophilic block, and
23% by weight of units derived from a hydroxyethyl methacrylate monomer, relative to the weight of said hydrophilic block, and

50% by weight, relative to the weight of the copolymer, of a hydrophobic block comprising at least 99% by weight of polymethyl methacrylate relative to the weight of said hydrophobic block.

2. The copolymer as claimed in claim 1 , wherein said hydrophilic block is composed of a statistical copolymer containing at least one unit derived from an n-butyl acrylate monomer and at least one unit derived from a hydroxyethyl methacrylate monomer.

3. The copolymer as claimed in claim 1 , wherein said copolymer is a (poly-n-butyl acrylate-co-polyhydroxyethyl methacrylate-b-hydrophobic block) copolymer, the hydrophobic block comprising at least 99% by weight of polymethyl methacrylate, relative to the weight of the copolymer, and a mixture of units derived from methacrylate or acrylate monomers.

4. The copolymer as claimed in claim 1 , wherein the weight-average molecular weight of said copolymer ranges from 10 to 400 kg/mol.

5. A polymeric membrane, comprising at least one hydrophobic polymeric matrix and at least one copolymer as defined in claim 1 .

6. The polymeric membrane as claimed in claim 5 , wherein the hydrophobic polymeric matrix is a fluoropolymer.

7. The polymeric membrane as claimed in claim 5 , which comprises from 5 to 99.9% by weight of said hydrophobic polymeric matrix, relative to the weight of the membrane, and from 0.1 to 95% by weight of said copolymer relative to the weight of the membrane.

8. The polymeric membrane as claimed in claim 5 , obtained by a phase inversion process, from a solution comprising at least one hydrophobic polymeric matrix, at least one copolymer as defined in claim 1 and optionally one or more other additives, in solution in a solvent.

9. The polymeric membrane as claimed in claim 8 , obtained by said phase inversion process from a solution comprising:
from 4.9 to 50% by weight of said hydrophobic polymeric matrix, relative to the weight of the solution;
from 0.1 to 35% by weight of said copolymer, relative to the weight of the solution;
from 15 to 95% by weight of solvent, relative to the weight of the solution; and
optionally from 0 to 20% by weight of one or more additives, relative to the weight of the solution.

10. A method of making the polymeric membrane as defined in claim 5 , comprising combining the hydrophobic polymeric matrix and the copolymer.

11. A method of treating an effluent, comprising contacting the effluent with the polymeric membrane as defined in claim 5 .

12. The method as defined in claim 11 , wherein the effluent is water.

Assignees

• Arkema France
• Polymem

Inventors

• Kosar Walter Phillip
• Lorain Olivier
• Marcellino Sébastien
• Beaume François
• Gerard Pierre

Classifications

• B01D71/4011

  Polymethylmethacrylate · CPC title

• C08F2800/20

  as weight or mass percentages · CPC title

• B01D61/147

  Microfiltration · CPC title

• B01D2325/18

  Membrane materials having mixed charged functional groups · CPC title

• C08F293/005 Primary

  using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent · CPC title