US2013101889A1PendingUtilityA1

Composite porous membrane, method for producing composite porous membrane and battery separator using same

54
Assignee: MIZUNO NAOKIPriority: Jun 25, 2010Filed: Aug 26, 2010Published: Apr 25, 2013
Est. expiryJun 25, 2030(~4 yrs left)· nominal 20-yr term from priority
Inventors:Naoki MizunoMichihiko IrieYoshitaka AyuzawaMasanori Nakamura
B32B 27/34H01M 50/451H01M 50/491H01M 50/489H01M 50/414H01M 50/403B32B 2305/026B32B 2250/02B32B 27/281B32B 2250/24H01M 50/449B32B 37/025B32B 3/26B32B 2037/268C08J 9/28B32B 27/08Y02E60/10B32B 2307/724B32B 27/16H01M 50/411B29C 67/202B32B 2457/10B32B 2307/308B32B 5/32B32B 5/18H01M 50/409B32B 27/32H01M 2/1686H01M 2/145
54
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

A composite porous membrane including a porous membrane A formed of a polyolefin-based resin; and a porous membrane B containing a heat-resistant resin and laminated on the porous membrane A, wherein the porous membrane A satisfies formulas (A) to (C), the composite porous membrane satisfies formula (D), and the composite porous membrane satisfies formulas (F) and (F) wherein thickness of porous membrane A<10 μm formula (A); 0.01 μm≦average pore diameter of porous membrane A≦1.0 μm formula (B); 30% porosity of porous membrane A≦70% formula (C); thickness of entire composite porous membrane≦13 μm formula (a); peel strength at interface between porous membrane A and porous membrane B≧1.0 N/25 mm formula (E); 20≦Y−X≦100 formula CO and wherein X is a gas permeation resistance (seconds/100 ccAir) of porous membrane A, and Y is a gas permeation resistance (seconds/100 ccAir) of the composite porous membrane.

Claims

exact text as granted — not AI-modified
1 - 9 . (canceled) 
     
     
         10 . A composite porous membrane comprising:
 a porous membrane A formed of a polyolefin-based resin; and   a porous membrane B containing a heat-resistant resin and laminated on the porous membrane A,   wherein the porous membrane A satisfies formulas (A) to (C), the composite porous membrane satisfies formula (D), and the composite porous membrane satisfies formulas (E) and (F):   thickness of porous membrane A<10 μm formula (A);   0.01 μm≦average pore diameter of porous membrane A um formula (B);   30%≦porosity of porous membrane A≦70% formula (C);   thickness of entire composite porous membrane≦13 μm formula (D);   peel strength at interface between porous membrane A and porous membrane B≧1.0 N/25 mm formula (E)   20≧Y−X≧100 formula (F) and   wherein X is a gas permeation resistance (seconds/100 ccAir) of porous membrane A, and Y is a gas permeation resistance. (seconds/100 ccAir) of the composite porous membrane.   
     
     
         11 . The composite porous membrane according to  claim 10 , wherein the gas permeation resistance of the composite porous membrane is 50 to 600 seconds/100 ccAir. 
     
     
         12 . The composite porous membrane according to  claim 10 , wherein the heat resistant resin is a polyamideimide resin, a polyimide resin or a polyamide resin. 
     
     
         13 . The composite porous membrane according to  claim 12 , wherein the heat-resistant resin is a polyamideimide resin having a logarithmic viscosity of 0.5 dl/g or more. 
     
     
         14 . A method of producing the composite porous membrane according to  claim 10 , comprising steps (i) and (ii):
 (i) applying a heat-resistant resin solution onto a base film, followed by passing the coated film through a low-humidity zone having an absolute humidity of less than 6 g/m 3 , and then through a high-humidity zone having an absolute humidity of 6 g/m 3  or more and 25 g/m 3  or less to form a heat-resistant resin membrane on the base film; and   (ii) bonding together the heat-resistant resin membrane formed in step (i) and a porous membrane A formed of a polyolefin-based resin, followed by converting the heat-resistant resin membrane into a porous membrane B by immersion in a solidification bath, and washing and drying the same to obtain a composite porous membrane.   
     
     
         15 . The method according to  claim 14 , wherein the base film is peeled off after the composite porous membrane is obtained in step (ii). 
     
     
         16 . The method according to  claim 14 , wherein the base film is a polyester based film or polyolefin-based film having a thickness of 25 to 100 μm. 
     
     
         17 . The method according to  claim 14 , wherein, in step (i), the time of passage through the low-humidity zone is 3 seconds or more and 20 seconds or less, and the time of passage through the high-humidity zone is 3 seconds or more and 10 seconds or less. 
     
     
         18 . A battery separator comprising the composite porous membrane according to  claim 10 . 
     
     
         19 . The composite porous membrane according to  claim 11 , wherein the heat-resistant resin is a polyamideimide resin, a polyimide resin or a polyamide resin. 
     
     
         20 . The method according to  claim 15 , wherein the base film is a polyester-based all or polyolefin-based film having a thickness of 25 to 100 μm.

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.