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Laminated porous film for separator

A porous film and laminated technology, applied in applications, layered products, household appliances, etc., can solve the problems of poor productivity, difficult film production, difficult productivity, etc., and achieve excellent electrical properties, excellent tear strength, Effects that are simple and efficiently produced

Inactive Publication Date: 2011-08-31
MITSUBISHI PLASTICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, this manufacturing method requires strict control of manufacturing conditions, and it is difficult to say that it has good productivity
For example, in the production of a laminated film before porosity, the film is formed while controlling the higher-order structure at a high draw ratio, but it is difficult to form a stable film at such a high draw ratio
In addition, in order to form a porous structure, it is necessary to divide the low-temperature zone and the high-temperature zone into two stages, and carry out multi-stage stretching at a small stretching speed. The stretching speed is greatly limited, and its productivity is extremely poor.
[0013] In addition, the separator produced by this production method also has the following problems: the tear strength in the direction perpendicular to the stretching direction is very weak, and cracks are easily generated in the stretching direction
However, there is no description of an example in which a blocking function is imparted, and it is difficult to impart the function of improving battery safety only by providing a polyethylene layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0217] With respect to 100 parts by mass of polypropylene resin (manufactured by Prime Polymer, Prime Polypro F300SV, MFR: 3g / 10min), 3,9-bis[4-(N-cyclohexylamino) was added as a β crystal nucleating agent Formyl) phenyl]-2,4,8,10-tetraoxaspiro[5.5]undecane 0.1 mass parts, and utilize the co-rotating twin-screw extruder (diameter φ 40mm, L / D=32), melt-kneading was carried out at 280° C., and resin composition A1 processed into pellets was obtained.

[0218] In addition, high-density polyethylene (manufactured by Prime Polymer, Hi-ZEX3300F, density: 0.950 g / cm 3 , MFR: 1.1g / 10min) 20 parts by mass of hydrogenated petroleum resin (manufactured by Arakawa Chemical Industry Co., Ltd., ALCONP115) was added to 80 parts by mass, and the same type of co-rotating twin-screw extruder was used at 230°C. The resin composition B1 processed into pellets was obtained by melt-kneading.

[0219] Resin compositions A1 and B1 were extruded at 210°C using an extruder, and extruded from a T-die...

Embodiment 2

[0223] High-density polyethylene (manufactured by Prime Polymer, Hi-ZEX3300F, density: 0.950g / cm 3 , MFR: 1.1g / 10 minutes) 80 mass parts of maleic anhydride modified linear low density polyethylene (manufactured by Mitsui Chemicals Co., Ltd., ADMERNF308) 20 mass parts, and use the same type of co-rotating twin-screw extruder, Melt-kneading was performed at 230° C., and resin composition B2 processed into pellets was obtained.

[0224] Using the resin composition B2 instead of the resin composition B1, under the same extrusion conditions as in Example 1, a laminated non-porous film with a thickness of 80 μm was obtained.

[0225] The above-mentioned laminated non-porous film was sequentially biaxially stretched (stretched to 4.0 times in MD at 100°C, then stretched to 2.5 times in TD at 100°C), and then thermally relaxed at 100°C by 4%. , thus obtaining a laminated porous membrane.

[0226] Various characteristics of the obtained laminated porous membrane were measured and ev...

Embodiment 3

[0228] High-density polyethylene (manufactured by Prime Polymer, Hi-ZEX3300F, density: 0.950g / cm 3 , MFR: 1.1g / 10 minutes) 80 mass parts of ethylene-methyl methacrylate copolymer (manufactured by Sumitomo Chemical Co., Ltd., Acryft CM8014) 20 mass parts, and use the same type of co-rotating twin-screw extruder, Melt-kneading was carried out at 230° C., and resin composition B3 processed into pellets was obtained. Except having used the resin composition B3 instead of the resin composition (B2), it carried out similarly to Example 2, and obtained the laminated porous film.

[0229] Various characteristics of the obtained laminated porous membrane were measured and evaluated, and the results are summarized in Table 1.

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Abstract

Disclosed is a laminated porous film for a separator of a battery that, while having excellent air permeation performance which contributes to electric performance, has a shutdown property which is one of properties important from the viewpoint of ensuring safety. The laminated porous film is characterized in that the laminated porous film comprises layer A formed of a porous layer composed mainly of a polypropylene resin and layer B formed of a porous layer composed mainly of a polyethylene resin, has a ss-activity, and has an electric resistance of not more than 10 Omh at 25 DEG C and an electric resistance of not less than 100 Omh after heating at 135 DEG C for 5 seconds and / or an air permeability of not more than 1000 sec / 100 ml at 25 DEG C and an air permeability of not less than 10000 sec / 100 ml after heating at 135 DEG C for 5 seconds.

Description

technical field [0001] The present invention relates to a laminated porous film for a separator of a battery, and particularly relates to a laminated porous film suitable as a separator for a nonaqueous electrolyte battery. Background technique [0002] Secondary batteries have been widely used as power sources for portable devices such as OAs, FAs, home appliances, and communication devices. In particular, lithium-ion secondary batteries can achieve good volumetric efficiency when they are arranged in equipment, thereby enabling miniaturization and weight reduction of equipment. Therefore, portable equipment using lithium-ion secondary batteries continues to grow. Increase. On the other hand, in many fields involving energy / environmental issues such as load adjustment, UPS, and electric vehicles, research and development of large-scale secondary batteries has also made progress. As a type of non-aqueous electrolyte secondary batteries, lithium Ion secondary batteries are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B32B27/32H01M50/406H01M50/417H01M50/449
CPCY02E60/12B32B27/18H01M2/1686B32B2457/10B32B27/205B32B27/32H01M2/145B32B2307/518H01M2/1653B32B27/08H01M10/052Y10T428/249953Y02E60/10H01M50/449H01M50/417H01M50/406C08L23/12H01M50/403H01M50/411H01M50/489H01M50/491H01M50/494
Inventor 山本美保新井英敬根本友幸胜原一成山田刚干
Owner MITSUBISHI PLASTICS INC
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