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Porous polypropylene film, layered porous film, and electricity-storage device

A polypropylene film, porosity technology, applied in the direction of circuits, capacitors, layered products, etc., to achieve the effects of less physical property changes, organic solvent resistance and excellent air permeability

Inactive Publication Date: 2014-06-25
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the porous polypropylene film using the β-crystal method is coated with an organic solvent such as acetone and dried, the pore structure changes, and the thickness and air permeability may change. Therefore, as described in Patent Documents 6 to 14, As in the case, the coating agent for coating is limited to the water system, and it is difficult to use an organic solvent with a fast drying speed to improve productivity.

Method used

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  • Porous polypropylene film, layered porous film, and electricity-storage device
  • Porous polypropylene film, layered porous film, and electricity-storage device
  • Porous polypropylene film, layered porous film, and electricity-storage device

Examples

Experimental program
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Effect test

Embodiment 1）

[0101] The raw material was supplied to the twin-screw extruder from a metering hopper so that 99.7 parts by mass of Sumitomo Chemical Co., Ltd. propylene homopolymer FLX80E4, a polypropylene resin with a melting point of 165° C. and an MFR of 7.5 g / 10 minutes, 0.3 parts by mass N, N'-dicyclohexyl-2,6-naphthalene dicarboxamide (manufactured by Shin Nippon Chemical Co., Ltd., NU-100) as a β-crystal nucleating agent, and 0.1 parts by mass each of Chiba as an antioxidant IRGANOX1010 and IRGAFOS168 manufactured by Specialty Chemicals were mixed at this ratio, and melt-kneaded at 300°C. Then, the melted and kneaded material was discharged from the die in a thread form, cooled and solidified in a water bath at 25° C., and cut into pieces to obtain a polypropylene composition (I).

[0102] Next, raw materials were supplied from the weighing hopper to the twin-screw extruder so that 70 parts by mass of Sumitomo Chemical Co., Ltd. propylene homopolymer FLX80E4 with a melting point of 1...

Embodiment 2）

[0108] The raw materials were supplied to the twin-screw extruder from a metering hopper so that 59.8 parts by mass of propylene homopolymer FLX80E4 and 30 parts by mass of ethylene-octene-1 copolymer (Engage 8411 manufactured by Dow Chemical) as a copolymerized PE resin, melt index: 18 g / 10 minutes), 10 parts by mass of CEBC (JSR Co., Ltd. DYNARON 6200P) as a dispersant, and 0.1 parts by mass of each of IRGANOX 1010 and IRGAFOS 168 from Chiba Specialty Chemicals as an antioxidant were mixed according to this ratio. °C for melt kneading. The melted and kneaded material was discharged from the die in the form of a thread, cooled and solidified in a water bath at 25° C., and cut into pieces to obtain a polypropylene raw material (IV).

[0109] The obtained polypropylene composition (I) 73.3 mass parts, polypropylene composition (IV) 10 mass parts, and polypropylene composition (III) 16.7 mass parts were dry-blended, and supplied to the single-screw melter for layer A In the ext...

Embodiment 3）

[0112] In Example 2, relaxation was performed at 164° C. and a relaxation rate of 20% (Rx region). Except for this, a porous polypropylene film having a width of 500 mm and a thickness of 25 μm was obtained under the same conditions as in Example 2.

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Abstract

Provided are: a porous polypropylene film that exhibits excellent gas permeability and resistance to organic solvents, wherein when said film is coated with a functional layer such as a heat-resistance layer, the physical properties of said film do not change much; a layered porous film; and an electricity-storage device. Said porous polypropylene film, which contains a polypropylene resin that can form a beta crystal structure, is characterized by a gas permeation resistance of 1,000 sec / 100 ml or less and further characterized in that an acetone-immersion treatment changes the thickness of the porous polypropylene film by no more than 20%.

Description

technical field [0001] The present invention relates to a porous polypropylene film, a laminated porous film, and an electrical storage device using the same. Background technique [0002] Porous polypropylene films are being used in various applications such as batteries, separators of electrolytic capacitors, various separation films, clothing, moisture-permeable waterproof films for medical applications, reflectors for flat panel displays, thermal transfer recording sheets, etc. Studied. Among these, porous films are suitable as separators for lithium ion batteries widely used in mobile devices such as notebook personal computers, mobile phones, and digital cameras. In particular, in recent years, lithium-ion batteries have begun to be used in electric vehicles and hybrid vehicles. With the increase in power and capacity of batteries, many studies have been conducted on coating inorganic particle layers and heat-resistant resin layers on porous membranes. (For example, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00B32B5/18B32B27/32H01G11/52H01M2/16H01M50/417H01M50/489H01M50/491
CPCB32B27/18B32B2307/726B32B27/32B32B27/08B32B2250/03B32B2307/704B32B2307/714B32B2307/306B32B2270/00B32B2250/242C08J2323/12B32B2307/724Y02E60/13H01G11/52B32B2307/734B32B2457/10C08J5/18H01G9/02B32B3/26B32B2250/40B32B2307/518H01M2/1653Y02E60/10H01M50/417H01M50/491H01M50/489C08J5/22C08L23/12
Inventor 生驹启久万琢也大仓正寿
Owner TORAY IND INC
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