Polymer composition and porous membrane

Patent metadata

Field	Value
Publication number	US-9844759-B2
Application number	US-201314652506-A
Country	US
Kind code	B2
Filing date	Dec 20, 2013
Priority date	Dec 20, 2012
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A polymer composition containing a polymer (B) obtained by polymerizing a monomer composition containing: a methacrylic acid ester macromonomer (b1) represented by the following formula (1); and another monomer (b2). Also, a porous membrane formed from a membrane forming polymer (A) and the aforementioned polymer composition.

First claim

The invention claimed is:

1. A porous membrane formed from a resin composition containing:
a membrane forming polymer (A); and
a polymer (B) obtained by polymerizing a monomer composition containing a methacrylic acid macromonomer or methacrylate macromonomer (b1) represented by the following Formula (1)

and other monomer (b2) which is a (meth)acrylic acid or (meth)acrylate,
wherein Formula (1),
R and R 1 to R n each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a heterocyclic group,
Z is a terminal group, and
n is an integer from 2 to 10,000.

2. The porous membrane according to claim 1 , wherein the membrane forming polymer (A) is a fluorine-containing polymer.

3. The porous membrane according to claim 1 , wherein a contact angle of pure water on an outer surface of the porous membrane is 75° or less.

4. The porous membrane according to claim 1 , wherein the porous membrane comprises pores having an average pore size of 500 nm or less.

5. The porous membrane according to claim 4 , wherein the porous membrane comprises pores having an average pore size of 120 nm or less.

6. The porous membrane according to claim 1 , wherein the polymer (A) is present in the porous membrane in an amount from 20 to 95 parts by mass with respect to 100 parts by mass of the total amount of the polymer (A) and the polymer (B).

7. The porous membrane according to claim 1 , wherein the polymer (B) is present in the resin composition in an amount from 1 to 50 parts by mass with respect to 100 parts by mass of the total amount of the polymer (A) and the polymer (B) in the resin composition.

8. The porous membrane according to claim 1 , wherein the macromonomer (b1) is present with respect to 100 parts by mass of the total amount of the macromonomer (b1) and the other monomer (b2) in an amount from 5 to 99 parts by mass.

9. The porous membrane according to claim 8 , wherein the macromonomer (b1) is present with respect to 100 parts by mass of the total amount of the macromonomer (b1) and the other monomer (b2) in an amount from 50 to 95 parts by mass.

10. The porous membrane according to claim 1 , wherein a number average molecular weight (Mn) of the polymer (B) is 1,000 to 5,000,000.

11. The porous membrane according to claim 1 , wherein a number average molecular weight of the macromonomer (b1) is from 1,000 to 1,000,000.

12. The porous membrane according to claim 11 , wherein the number average molecular weight of the macromonomer (b1) is from 8,000 to 38,000.

13. The porous membrane according to claim 1 , wherein a molecular weight distribution (a mass average molecular weight (Mw)/a number average molecular weight (Mw)) of the macromonomer (b1) is 1.5 or more and 5.0 or less.

14. The porous membrane according to claim 1 , wherein a flux of pure water is 1.0×10 −10 (m 3 /m 2 /s/Pa) or more.

15. The porous membrane according to claim 1 , wherein the monomer (b2) is at least one selected from the group consisting of methyl methacrylate, methoxy-diethylene glycol methacrylate, methoxy-nonaethylene glycol methacrylate, 2-hydroxyethyl methacylate, 2-hydroxyethyl acrylate and methacrylic acid.

Assignees

• Mitsubishi Rayon Co
• Mitsubishi Chem Corp

Inventors

• Hikita Shingo
• Noda Tetsuya

Classifications

• B01D2323/02

  Hydrophilization · CPC title

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C08J2451/00

  Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers · CPC title

• B01D71/34

  Polyvinylidene fluoride · CPC title