Resin film, laminate, method for producing same, and method for producing fuel cell

Patent metadata

Field	Value
Publication number	US-10355298-B2
Application number	US-201515308703-A
Country	US
Kind code	B2
Filing date	Apr 30, 2015
Priority date	May 19, 2014
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A polymer film comprises a polymer composition containing (A) a cyclic olefin polymer and (B) a chlorine-containing polymer. The chlorine-containing polymer (B) may comprise a vinylidene chloride-series polymer. The cyclic olefin polymer (A) may comprise a cyclic olefin copolymer. The ratio of the chlorine-containing polymer (B) relative to 100 parts by weight of the cyclic olefin polymer (A) may be 0.5 to 60 parts by weight. The film has a moderate releasability from an electrolyte membrane and an electrode membrane of a polymer electrolyte fuel cell and a moderate adhesion to the electrolyte membrane and the electrode membrane and can adhere to a commonly-used substrate film without interposition of an adhesive layer such as an easily adhesive layer. The film is thus suitable as a release film for producing a membrane electrode assembly of a polymer electrolyte fuel cell.

First claim

The invention claimed is:

1. A membrane electrode assembly of a polymer electrolyte fuel cell, which comprises a laminated film and an ion exchange layer,
wherein the laminated film comprises a substrate layer and a release layer on at least one side of the substrate,
wherein the release layer has an average thickness of 0.01 to 20 μm, and
the release layer comprises a polymer composition containing:
(A) a cyclic olefin polymer; and
(B) a vinylidene chloride-series polymer,
wherein the ion exchange layer is formed on the release layer and comprises an ion exchange polymer.

2. The membrane electrode assembly according to claim 1 , wherein the cyclic olefin polymer (A) comprises a cyclic olefin copolymer.

3. The membrane electrode assembly according to claim 1 , wherein the cyclic olefin polymer (A) contains (A1) a cyclic olefin unit and (A2) a chain olefin unit as repeating units.

4. The membrane electrode assembly according to claim 3 , wherein a ratio (molar ratio) of the cyclic olefin unit (A1) relative to the chain olefin unit (A2) is 50/50 to 90/10 in the former/the latter.

5. The membrane electrode assembly according to claim 1 , wherein the cyclic olefin polymer (A) comprises a copolymer of a norbornene compound and a chain α-C 2-4 olefin.

6. The membrane electrode assembly according to claim 1 , wherein the cyclic olefin polymer (A) comprises a cyclic olefin polymer free from an olefin unit having a C 3-10 alkyl group as a side chain thereof.

7. The membrane electrode assembly according to claim 1 , wherein a ratio of the vinylidene chloride-series polymer (B) relative to 100 parts by weight of the cyclic olefin polymer (A) is 0.5 to 60 parts by weight.

8. The membrane electrode assembly according to claim 1 , wherein the substrate layer comprises at least one member selected from the group consisting of a polyolefin, a poly(vinyl alcohol)-series polymer, a polyester, a polyamide, a polyimide, and a cellulose derivative.

9. The membrane electrode assembly according to claim 8 , wherein the substrate layer comprises the polyester and is free from an adhesive layer or an easily adhesive layer.

10. The membrane electrode assembly according to claim 1 , wherein the release layer is formed by coating.

11. The membrane electrode assembly according to claim 1 , wherein the ion exchange polymer comprises a fluoropolymer comprising a side chain having a sulfonic acid group, and the ion exchange layer comprising the ion exchange polymer is an electrolyte membrane, an electrode membrane, or both.

12. A process for producing a membrane electrode assembly recited in claim 1 , comprising: a step of laminating the release layer on the substrate layer by coating a solution containing the release layer composition on the substrate layer.

13. A process for producing a membrane electrode assembly according to claim 12 , further comprising: a step of separating the ion exchange layer containing the ion exchange polymer from the laminated film.

Assignees

• Daicel Value Coating Ltd
• Daicel Corp

Inventors

• Okada Kazuyuki
• Nishimura Kanae

Classifications

• B32B27/30

  comprising vinyl {(co)polymers; comprising acrylic (co)polymers} · CPC title

• Y10T428/3175

  Next to addition polymer from unsaturated monomer[s] · CPC title

• Y02P70/56

  Cross-Sectional Technologies · mapped topic

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title

• Y10T428/31888

  Addition polymer of hydrocarbon[s] only · CPC title