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Porous film

A porous thin film and thin film technology, applied in the direction of membrane, membrane technology, thin material processing, etc., can solve the problems of mechanical strength reduction, dangerous electrical short circuit, ion permeability reduction, etc.

Inactive Publication Date: 2006-01-11
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pore structure in the porous film disclosed in this publication is not a network structure but a structure in which voids are formed straight in the depth direction of the film, and this porous film is excellent in mechanical strength but poor in ion permeability
[0005] In order to improve ion permeability, making the porous film thinner has been proposed in the prior art, but when the film is made thinner, problems such as lowering of mechanical strength, dangerous electrical short circuit, etc. arise
On the other hand, when the porous film is made thicker in order to prevent electrical short circuit and improve mechanical strength, ion permeability decreases

Method used

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Examples

Experimental program
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Embodiment 1

[0067] Using a stagewise designed twin-screw kneader (produced by Research Laboratory of Plastics Technology Co., Ltd.) so that 30% by volume of calcium carbonate Starpigot 15A (average particle diameter of 0.15 μm, produced by Shiraishi Calcium Co., Ltd.) can Forced kneading with 70% by volume of a mixed polyethylene resin, so that these materials are kneaded, to obtain a resin composition, said polyethylene resin is made of 70% by weight polyethylene film (Highzex Million 340M, weight average molecular chain length is 17000nm, An average molecular weight of 3,000,000, a melting point of 136°C, produced by Mitsui Chemicals) and 30% by weight of polyethylene wax (High Wax 110P, a weight average molecular weight of 100, a melting point of 110°C, produced by Mitsui Chemicals).

[0068] The content of polyethylene having a molecular chain length of 2850 nm or longer in this resin composition was 27% by weight. This resin composition was calendered (roll temperature: 150° C.) to p...

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PUM

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Abstract

The present invention provides a porous film having practically sufficient mechanical strength and excellent in ion permeability. Disclosed is a porous film made of thermoplastic resin having micropores, wherein the micropores are formed from a 3-dimensional network made of trunk fibrils extending in one direction of the film and branch fibrils through which the trunk fibrils are connected to one another, and the density of the branch fibrils formed is higher than the density of the trunk fibrils formed, and the average pore diameter d (mum) of the micropores as determined by a bubble-point method (ASTM F316-86) and the average pore radius r (mum) of the micropores as determined by mercury porosimetry (JIS K1150) satisfy the relationship 1.20<=2 r / d<=1.70.

Description

technical field [0001] The present invention relates to a porous film made of thermoplastic resin. Specifically, the present invention relates to a porous film made of thermoplastic resin, which is preferably used as a separator for electrolytic capacitors, lithium batteries, storage batteries, and the like. Background technique [0002] Porous films made of thermoplastic resins are used as moisture-permeable raincoats; membranes for reverse osmosis or ultrafiltration; and separators for electrolytic capacitors, lithium batteries, storage batteries, etc. [0003] It is desired that a thin film used as a separator not only contain an electrolyte to prevent electrical short circuit between the anode and cathode and have mechanical stability, but also be excellent in ion permeability in the electrolyte. In particular, with the recent increase in battery capacity, improvement in ion permeability is highly desired. [0004] As a separator using a thermoplastic resin as a raw ma...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L23/00C08J9/00B01D67/00B01D69/02B01D69/14B01D71/26B29C55/00H01G9/02H01M50/417H01M50/489H01M50/497
CPCH01M2/162B29K2091/00H01G9/02H01M10/052B01D2323/12H01M2/1653B01D67/0027Y02E60/122B01D69/02B29K2023/0683C08J5/18B01D69/141B01D71/26B29C55/005B29K2105/04B01D67/009B29K2105/16Y10T428/249979Y10T428/249978Y02E60/10H01M50/44H01M50/417H01M50/497H01M50/489C08J9/22C08J5/2231B01D71/261
Inventor 高田敦弘黑田龙磨山田武
Owner SUMITOMO CHEM CO LTD
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