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Polyethylene microporous membrane and process for manufacturing same

A technology of a microporous film and a manufacturing method, which can be applied to flat products, other household appliances, household components, etc., can solve the problem of bead-like coating streaks on the coating layer, the inability to uniformly coat the coating agent, and the deterioration of flatness, etc. problem, to achieve the effect of excellent permeability and flatness, excellent safety and functionality, and good productivity

Active Publication Date: 2014-12-17
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the polyolefin-based microporous membranes disclosed in Patent Documents 1 and 2, waviness may occur during and after manufacture, resulting in poor planarity. If the polyolefin-based microporous membrane with deteriorated planarity is used as a base On the other hand, forming a processed layer such as a coating layer has the following problems: the coating agent cannot be applied uniformly, and beaded coating streaks are generated on the coating layer, resulting in defective products caused by processing.

Method used

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  • Polyethylene microporous membrane and process for manufacturing same
  • Polyethylene microporous membrane and process for manufacturing same
  • Polyethylene microporous membrane and process for manufacturing same

Examples

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preparation example Construction

[0069] (a) Preparation of polyethylene solution

[0070] Polyethylene or a polyethylene composition is heated and dissolved in a solvent to prepare a polyethylene solution. As mentioned above, the polyethylene composition is preferably prepared from a first polyethylene and a second polyethylene, most preferably having a weight average molecular weight (Mw) of 5 x 10 5 ~9×10 5 The first polyethylene with a Mw of 1 x 10 6 ~5×10 6 The composition of the second polyethylene.

[0071] Here, the solvent is not particularly limited as long as it can sufficiently dissolve polyethylene. In order to enable stretching at a relatively high ratio, the solvent is preferably liquid at room temperature. Examples of liquid solvents include aliphatic, cycloaliphatic or aromatic hydrocarbons such as nonane, decane, decahydronaphthalene, p-xylene, undecane, dodecane, liquid paraffin, and their corresponding boiling points. Mineral oil fractions, dibutyl phthalate, dioctyl phthalate and oth...

Embodiment 1

[0239] Preparation of polyethylene composition, said polyethylene composition comprising Mw is 2.0×10 6 40% by weight of ultra-high molecular weight polyethylene (UHMWPE) having a melting point of 135° C. and a crystal dispersion temperature of 90° C. with a Mw / Mn of 5, and a weight average molecular weight (Mw) of 5.6×10 5 60% by weight of high-density polyethylene (HDPE) having a molecular weight distribution (Mw / Mn) of 4.1, a melting point of 135° C. and a crystal dispersion temperature of 90° C., and 0.1 / 10,000 carbon atoms of terminal vinyl groups. The melting point Tm of the polyethylene composition was 135°C, and the crystal dispersion temperature Tcd was 90°C.

[0240] It should be noted that UHMWPE and Mw and Mw / Mn of HDPE (the same applies hereinafter).

[0241] ・Measuring device: PL-GPC220 manufactured by Polymer Laboratories

[0242] · Column: Polymer Laboratories, Three PLgel Mixed-B Columns

[0243] ·Column temperature: 145℃

[0244] ・Solvent (mobile phase):...

Embodiment 2～6

[0255] As described in Table 1 and Table 2, the relaxation rate in the longitudinal direction in the thermal relaxation treatment was changed, and a polyethylene microporous membrane was produced and evaluated by the same method as in Example 1.

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Abstract

A polyethylene microporous membrane and a manufacturing method thereof are provided. The polyethylene microporous membrane exhibits a Gurley air permeability of 1 to 1,000 sec / 100mL / 25mum and in which the total length of widths of waves in the widthwise direction of the microporous membrane is at most one-third of the overall width of the microporous membrane. The present invention provides the polyethylene microporous membrane having excellent flatness without impairing the other important physical properties such as permeability.

Description

technical field [0001] The present invention relates to a polyethylene microporous membrane, and particularly relates to a polyethylene microporous membrane suitable for battery separators and a method for producing the same. Background technique [0002] A microporous membrane has a large number of fine pores. These fine pores connect the surface and the back of the microporous membrane to impart permeability, whereby the microporous membrane has good permeability. Therefore, it has been used in various separators such as batteries and electrolytic capacitors, Various separation membranes (filters), absorbent articles represented by diapers and sanitary products, clothing, moisture-permeable and waterproof members for medical use, members for heat-sensitive receiving paper, members for ink receptors, etc. use. Microporous membranes, especially polyolefin-based microporous membranes made of polyethylene and polypropylene, have been used as battery separators for separating...

Claims

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Application Information

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IPC IPC(8): C08J9/00C08J7/04H01M2/16H01M50/406H01M50/414H01M50/449H01M50/489H01M50/491H01M50/494
CPCB29C48/08B29K2023/065B29K2023/0683B29K2105/0088B29L2007/001B29L2031/3468Y02E60/10H01M50/449H01M50/406H01M50/414H01M50/491H01M50/494H01M50/489B29K2105/041C08J9/28C08J9/36C08J5/22C08J2323/06B29K2023/06B29D7/01C08J9/365
Inventor 光冈秀人菊地慎太郎山田一博
Owner TORAY IND INC
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