POROUS BODY, POLYMER ELECTROLYTE MEMBRANE, FILTER MATERIAL FOR FILTER, AND FILTER UNIT

• US 20170001155A1
• Filed: 12/01/2014
• Published: 01/05/2017
• Est. Priority Date: 11/29/2013
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: CHAEN, Shinichi, YAMANAKA, Taku, YASUDA, Kohei, YAMADA, Masahiko, URAOKA, Nobuki, KONISHI, Tomohisa, INUI, Kunihiko, SHIBUYA, Yoshiyuki, ONO, Makoto
• Granted Patent: US 10,688,448 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B01D 2325/02 Details relating to pores or porosity of the membranes
• CPC Class Codes: B01D 2325/0281 Fibril, or microfibril structures
• CPC Class Codes: B01D 2325/02834 more than 0.1 and up to 1 µm
• CPC Class Codes: B01D 39/1692 Other shaped material, e.g. perforated or porous sheets
• CPC Class Codes: B01D 69/02 characterised by their properties
• CPC Class Codes: B01D 69/08 Hollow fibre membranes manufacture of hollow fibres D01D5/24, D01F1/08
• CPC Class Codes: B01D 69/081 characterised by the fibre diameter
• CPC Class Codes: B01D 71/36 Polytetrafluoroethene
• CPC Class Codes: B01J 20/261 obtained by reactions only involving carbon to carbon unsaturated bonds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds per se C08F
• CPC Class Codes: C08J 2327/18 Homopolymers or copolymers of tetrafluoroethylene
• CPC Class Codes: C08J 5/2237 containing fluorine
• CPC Class Codes: H01M 2008/1095 Fuel cells with polymeric electrolytes
• CPC Class Codes: H01M 8/1039 halogenated, e.g. sulfonated polyvinylidene fluorides
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

The present invention provides a porous body having high strength, a small pore size, and excellent homogeneity. The porous body of the present invention includes polytetrafluoroethylene and has a microstructure that includes nodes and fibrils. The microstructure further includes, in addition to the nodes and the fibrils, fused points where a fibril that links two nodes and another fibril that links another two nodes are fused with each other.

Claims

1. A porous body comprising polytetrafluoroethylene and having a microstructure that includes nodes and fibrils,

the microstructure further including, in addition to the nodes and the fibrils, fused points where a fibril that links two nodes and another fibril that links another two nodes are fused with each other.

2. The porous body according to claim 1,

wherein the microstructure includes five or more fused points within an area of 5 μ

m×

μ

m observed in an electron microscopic image taken using a scanning electron microscope at a magnification of 10000×

.

3. The porous body according to claim 1,

wherein the polytetrafluoroethylene is obtained by copolymerizing tetrafluoroethylene and a trace comonomer.

4. The porous body according to claim 3,

wherein the trace comonomer at least comprises perfluoro(methyl vinyl ether).

5. The porous body according to claim 4,

wherein the polytetrafluoroethylene comprises 0.011 mol % or more of a polymer unit derived from perfluoro(methyl vinyl ether) in all the monomer units.

6. The porous body according to claim 1, which is a porous membrane.

7. The porous body according to claim 1, which is obtained by biaxial stretching.

8. A filter material for filters, comprising

the porous body according to claim 1.

9. A filter unit comprising

the filter material for filters according to claim 8 and a frame that holds the filter material for filters.

10. A polymer electrolyte membrane comprising

the porous body according to claim 1.

11. The porous body according to claim 1 which is a porous hollow fiber.

12. The porous body according to claim 1, which is a porous fiber.