Polyethylene resin composition

A polyethylene resin and composition technology, applied in battery pack parts, electrical components, circuits, etc., can solve the problems of thermal shrinkage instability of microporous film thickness, and achieve excellent strength and fusing performance, film defects and film thickness. The effect of less unevenness and shorter time

Pending Publication Date: 2021-06-29
ASAHI KASEI KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, high-density polyethylene with a high degree of crystallinity has a small proportion of the above-mentioned amorphous components, so there is a problem that the molecular orientation cannot be sufficiently relaxed even if the heat-setting process is performed, and the thickness of the microporous film may be affected by heat. contraction etc. and unstable

Method used

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  • Polyethylene resin composition
  • Polyethylene resin composition
  • Polyethylene resin composition

Examples

Experimental program
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Embodiment

[0358] Hereinafter, the present embodiment will be described in more detail with reference to specific examples and comparative examples, but the present invention is not limited at all by the following examples and comparative examples.

[0359] [Measurement method and conditions]

[0360] The physical properties of the polyethylene resin compositions of Examples and Comparative Examples were measured by the following methods.

[0361] (1) Molecular weight determination

[0362] The polyethylene resin composition and the extracted component obtained by (3) described later were used as a measurement sample, and 15 mL of o-dichlorobenzene was added to 20 mg of the measurement sample, and stirred at 150° C. for 1 hour, thereby preparing The sample solution was prepared and measured by gel permeation chromatography (GPC) under the following conditions.

[0363] From the measurement results, number average molecular weight (Mn), weight average molecular weight (Mw) and molecular...

manufacture example 1

[0464] (Production Example 1: Catalyst Synthesis Example 1: Preparation of Solid Catalyst Component [A])

[0465] (1) Synthesis of raw material (a-1)

[0466] 1 mol / L of Mg was charged into an 8 L stainless steel autoclave fully replaced with nitrogen 6 (C 4 h 9 ) 12 Al(C 2 h 5 ) 32000mL of hexane solution (equivalent to 2000mmol in terms of magnesium and aluminum), while stirring at 50°C, 146mL of 5.47mol / L hexane solution of n-butanol was added dropwise for 3 hours, and after the end, 300mL of hexane Alkane cleaning lines. Then, stirring was continued at 50°C for 2 hours. After completion of the reaction, it was cooled to normal temperature, and the obtained substance was used as a raw material (a-1). The raw material (a-1) was 0.704 mol / L in terms of magnesium concentration.

[0467] (2) Synthesis of raw material (a-2)

[0468] 1 mol / L of Mg was charged into an 8L stainless steel autoclave fully replaced with nitrogen 6 (C 4 h 9 ) 12 Al(C 2 h 5 ) 3 2000mL ...

manufacture example 2

[0473] (Production Example 2: Catalyst Synthesis Example 2: Preparation of Supported Metallocene Catalyst Component [B])

[0474] (1) Synthesis of raw material [b-1]

[0475] The average particle size is 7μm, the specific surface area is 700m 2 / g and a particle inner pore volume of 1.9 mL / g were dehydrated by calcining at 500° C. for 5 hours in a nitrogen atmosphere.

[0476] Under a nitrogen atmosphere, 40 g of the dehydrated silica was dispersed in 800 mL of hexane in an autoclave with a capacity of 1.8 L to obtain a slurry.

[0477] While maintaining the resulting slurry at 20°C with stirring, 100 mL of a hexane solution of triethylaluminum (concentration: 1 mol / L) was added dropwise over 1 hour, followed by stirring at this temperature for 2 hours.

[0478] Then, unreacted triethylaluminum in the supernatant was removed by decantation of the obtained reaction mixture. In this manner, 800 mL of hexane slurry was obtained as the raw material [b-1] of the silica component...

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Abstract

The present invention obtains a polyethylene resin composition which, when processed into a separator for a battery, has excellent strength and fusing performance, can shorten the time from the beginning of fusing to the end of fusing, and has little film defects and film thickness unevenness. The polyethylene resin composition has Mw of 100,000 or more to 1000,000 or less and Mw / Mn of 2 or more to 18 or less. For a solution where an extracted component is obtained by carrying out temperature-rise dissociation fractionation on the polyethylene resin composition in accordance with prescribed conditions 'temperature-rise dissociation fractionation conditions for polyethylene resin compositions' and orthodichlorobenzene is used as a solvent, when cross-fractionation chromatography is performed in accordance with prescribed conditions 'CFC measurement condition for extraction component', the cumulative elution amount at 40 DEG C or more and less than 90 DEG C is 10 mass% or more and less than 70 mass% of the total elution amount, and the cumulative elution amount at 90 DEG C or more and 95 DEG C or less is 10 mass% or more of the total elution amount. And the temperature at which the maximum elution amount is reached is 88 or more or 100 DEG C or less.

Description

technical field [0001] The present invention relates to polyethylene resin compositions. Background technique [0002] Polyethylene is used in various applications such as sheets, films, and moldings, and is also one of its important applications as a raw material for battery separators (hereinafter sometimes referred to as separator raw materials). [0003] The separator refers to a porous membrane used mainly to separate the positive and negative electrodes inside the battery and to allow only ions to pass through. [0004] Other purposes of the above-mentioned separator include: use as a structural member of a battery for ensuring that the battery has a practically sufficient strength, and use as a current cutoff (hereinafter also referred to as a battery) for preventing runaway battery reactions when the internal temperature of the battery rises. The use of components with the function of "fusing"), etc. [0005] Compared with general-purpose polyethylene used for shee...

Claims

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Application Information

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IPC IPC(8): C08F210/16C08F4/646H01M50/417
CPCC08F210/16C08F4/6465C08F10/02
Inventor 辻本公一
Owner ASAHI KASEI KOGYO KK
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