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

Patent metadata

Field	Value
Publication number	US-10283801-B2
Application number	US-201515312523-A
Country	US
Kind code	B2
Filing date	Apr 30, 2015
Priority date	May 19, 2014
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A polymer film comprises a polymer composition containing (A) a cyclic olefin polymer containing an olefin unit having a C 3-10 alkyl group as a side chain thereof and (B) a chlorine-containing polymer. The chlorine-containing polymer (B) may comprise a vinylidene chloride-series polymer. 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 release film for producing a membrane electrode assembly of a polymer electrolyte fuel cell, comprising a polymer composition containing:
(A) a cyclic olefin polymer; and
(B) a vinylidene chloride-containing polymer,
wherein the cyclic olefin polymer (A) comprises a copolymer containing (A1) a cyclic olefin unit free from a C 3-10 alkyl group and (A2) a chain or cyclic olefin unit having a C 3-10 alkyl group as repeating units, and a ratio (molar ratio) of the cyclic olefin unit (A1) relative to the chain or cyclic olefin unit (A2) is 50/50 to 95/5 in the former/the latter.

2. The release film according to claim 1 , wherein a ratio of the vinylidene chloride-containing polymer (B) relative to 100 parts by weight of the cyclic olefin polymer (A) is 0.5 to 60 parts by weight.

3. A laminated film comprising a substrate layer and a film recited in claim 1 , as a release layer, on at least one side of the substrate.

4. The laminated film according to claim 3 , 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.

5. The laminated film according to claim 3 , wherein the substrate layer comprises the polyester and is free from an adhesive layer or an easily adhesive layer.

6. The laminated film according to claim 3 , wherein the release layer is formed by coating and has an average thickness of 0.01 to 20 μm.

7. The laminated film according to claim 3 , which further comprises an ion exchange layer on the release layer, wherein the ion exchange layer comprises an ion exchange polymer.

8. The laminated film according to claim 7 , 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.

9. A process for producing a laminated film recited in claim 3 , comprising: a step of laminating a release layer on a substrate layer by coating a solution containing a polymer composition on the substrate layer.

10. A process for producing a membrane electrode assembly of a polymer electrolyte fuel cell, comprising: a step of separating an ion exchange layer containing an ion exchange polymer from a laminated film recited in claim 7 .

Assignees

• Daicel Value Coating Ltd
• Daicel Corp

Inventors

• Okada Kazuyuki
• Nishimura Kanae
• Okano Yoshimichi
• Yaegashi Takayuki
• Osano Keiichi

Classifications

• H01M4/88

  Processes of manufacture · CPC title

• B32B27/00

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• C08L45/00

  Compositions of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Compositions of derivatives of such polymers (of cyclic anhydrides or imides C08L35/00; of cyclic esters of polyfunctional acids C08L31/00) · CPC title

• C08J2445/00

  Characterised by the use of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Derivatives of such polymers · CPC title

• B32B38/10

  Removing layers, or parts of layers, mechanically or chemically · CPC title