Laminate porous film manufacturing method

A manufacturing method and porous membrane technology, applied in chemical instruments and methods, coatings, layered products, etc., can solve problems such as wrinkles and achieve continuous and stable coating effects

Inactive Publication Date: 2013-09-18
MITSUBISHI PLASTICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porous polyolefin resin film for battery separators is characterized by being very thin and porous, and therefore has the following problem: it is easy to generate on the film during surface treatment such as corona treatment and / or after surface treatment. Wrinkles, unable to coat surface-treated porous membranes aesthetically

Method used

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  • Laminate porous film manufacturing method
  • Laminate porous film manufacturing method
  • Laminate porous film manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0211] Use a small-diameter gravure coating roll (roller diameter is 62mm, gravure engraving: grid (depth is 290μm, unit volume is 145cm 3 / m 2 )) coating the above-mentioned coating liquid to form a coating layer on the base material of the above-mentioned polyolefin resin porous membrane. Here, the tension (Ta) of the film in the drying step was controlled to 29 N / m, and the tension (Tb) of the film in the winding step was controlled to 25 N / m. The values ​​of Ta and Tb are measured by tension detectors connected to respective tension pick-up rollers.

Embodiment 2

[0213] Coating was performed in the same manner as in Example 1, except that the tension (Ta) of the film in the drying step was controlled to 40 N / m, and the tension (Tb) of the film in the winding step was controlled to 35 N / m.

Embodiment 3

[0215] Coating was performed in the same manner as in Example 1, except that the tension (Ta) of the film in the drying step was controlled to 35 N / m, and the tension (Tb) of the film in the winding step was controlled to 30 N / m.

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Abstract

Provided is a manufacturing method of a laminate porous film which is not prone to wrinkling and which comprises a covering layer laminated on at least one surface of a polyolephin resin porous film. This manufacturing method of a laminate porous film comprising a covering layer laminated on at least one surface of a polyolephin resin porous film is characterized by the tension (Ta) of the film in the drying step being less than or equal to 40N / m.

Description

technical field [0001] The present invention relates to a method for producing a laminated porous film using a polyolefin resin porous film, a battery separator and a battery using the laminated porous film. The laminated porous film produced in the present invention can be used as packaging, sanitary, livestock, agricultural, construction, medical, separation membrane, light diffusion plate, battery separator, and is particularly preferably used as a non-aqueous electrolyte battery Use with a partition. Background technique [0002] Porous polymers with many fine interconnected pores have been used in separation membranes used in the preparation of ultrapure water, purification of chemical solutions, water treatment, etc., waterproof and moisture-permeable membranes used in clothing / sanitary materials, or batteries, etc. Used in various fields such as battery separators. [0003] In particular, secondary batteries have been widely used as power sources for portable device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36B05D3/00B32B5/18B32B27/32H01M2/16C08J7/043H01M50/403H01M50/414H01M50/417H01M50/42H01M50/426H01M50/449
CPCB32B5/18B32B27/32C08J7/042C08J2323/02Y02E60/10H01M50/403H01M50/449H01M50/417H01M50/414H01M50/426H01M50/42C08J9/36C08J5/22C08L23/00B05D3/00B29D7/01H01M50/411H01M50/489H01M50/491
Inventor 寺井智彦桃平觉荒井博孝
Owner MITSUBISHI PLASTICS INC
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