POLYOLEFIN RESIN POROUS FILM, AND NON-AQUEOUS ELECTROLYTE CELL SEPARATOR USING SAME

• US 20130288132A1
• Filed: 01/23/2012
• Published: 10/31/2013
• Est. Priority Date: 01/27/2011
• Status: Active Grant

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Plastics Incorporated (Mitsubishi Chemical Group Corp.)
• Inventors: Usami, Yasushi, Terakawa, Toru, Yamada, Takeyoshi
• Granted Patent: US 9,419,266 B2
• Time in Patent Office: Days
• US Class Current: 429/249
• CPC Class Codes: B32B 15/085 comprising polyolefins
• CPC Class Codes: B32B 15/20 comprising aluminium or copper B32B15/016 and B32B15/017 take precedence
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 2307/724 Permeability to gases, adsorption
• CPC Class Codes: B32B 2437/00 Clothing
• CPC Class Codes: B32B 2439/70 Food packaging
• CPC Class Codes: B32B 2457/10 Batteries
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 3/266 characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
• CPC Class Codes: C08J 2323/02 not modified by chemical after treatment
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

This polyolefin resin porous film can be easily produced, and when used as a non-aqueous electrolyte cell separator, can suppress clogging and can evince a high cell output. The polyolefin resin porous film is a porous film having a polyolefin resin as the primary component and is characterized by the average flow diameter pressure (P_AP) being 1500-2500 kPa, the bubble point pressure (P_BP) being 300-1500 kPa, and the ratio (Pa/P_AP) of the air permeability (Pa) and the bubble point pressure (P_BP) being no greater than 0.35 sec/(100 ml·kPa).

Claims

1. A polyolefin resin porous film containing polyolefin resin as a main component thereof, wherein an average flow rate diameter pressure (PAP) is set to 1500 to 2500 kPa;

a bubble point pressure (PBP) is set to 300 to 1500 kPa; and

a ratio of an air permeability (Pa) to said bubble point pressure (PBP) is set to not more than 0.35 seconds/(100 ml·

kPa).

2. The polyolefin resin porous film according to claim 1, wherein said air permeability (Pa) is set to not more than 2000 seconds/100 ml.

3. The polyolefin resin porous film according to claim 1, wherein a ratio of said air permeability (Pa) to said average flow rate diameter pressure (PAP) is set to not more than 0.18 seconds/(100 ml·

kPa).

4. The polyolefin resin porous film according to claim 1, wherein said polyolefin resin contains not less than 30 mass % of polypropylene resin.

5. The polyolefin resin porous film according to claim 1, wherein said polyolefin resin has a β

crystal activity.

6. The polyolefin resin porous film according to claim 1, having an electric resistance of not more than 0.85Ω

.

7. The polyolefin resin porous film according to claim 1, having a porosity of 20 to 80%.

8. The polyolefin resin porous film according to claim 1, having a thickness of 3 to 100 μ

m.

9. A separator for a nonaqueous electrolyte battery consisting of a polyolefin resin porous film according to claim 1.