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Super high molecular weight polyolefin fine particle, method for producing the same and molded body of the same

A technology of polyolefin particles and ultra-high molecular weight, applied in separation methods, chemical instruments and methods, filtration and separation, etc., can solve the problem of small average particle size of powder and insufficient narrowness of particle size distribution, many catalyst residues, easy With problems such as static electricity, it achieves the effect of improving sliding characteristics and wear resistance, less catalyst residue, and efficient manufacturing

Inactive Publication Date: 2010-07-28
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since polyolefin powder is not only light, but also tends to be charged with static electricity, powder aggregation occurs, and it is difficult to efficiently produce ultra-high molecular weight polyolefin particles with a narrow particle size distribution from ultrafine particles with an average particle diameter of 20 μm or less
[0005] Conventionally, although polyolefin powders (compositions) with a specific particle size distribution exist (see Patent Documents 1 and 2), the average particle size of the powder and the narrowness of the particle size distribution are not sufficient.
[0006] In addition, although there is known a method of obtaining particulate ultrahigh molecular weight polyethylene using a special catalyst system (see Patent Document 3), there is much catalyst residue and insufficient performance.

Method used

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  • Super high molecular weight polyolefin fine particle, method for producing the same and molded body of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] [Preparation of Solid Transition Metal Catalyst Component (A)]

[0096] 4.76 g of anhydrous magnesium chloride, 23.2 ml of 2-ethylhexanol and 25 ml of decane were heated at 120° C. for 2 hours to form a homogeneous solution, and 0.9 ml of ethyl benzoate was further added. After cooling this homogeneous solution to -20°C, it was stirred and dropped into 200 ml of titanium tetrachloride over 1 hour. After the dropwise addition was completed, the mixture was warmed up to 90° C. over 1.5 hours, 1.8 ml of ethyl benzoate was added, and further stirred and maintained at 90° C. for 2 hours, and then the solid content was collected by filtration. Next, this solid content was lubricated again in 200 ml of titanium tetrachloride, and after heating at 90 degreeC for 2 hours, the solid content was collected by filtration. Wash thoroughly with purified hexane until no free titanium compound can be detected in the washing solution to obtain a solid transition metal catalyst component...

Embodiment 2

[0102] In an autoclave having an inner volume of 2 L, 1.0 L of purified decane, 1.0 mmol of triisobutylaluminum and 0.07 mmol of the aforementioned solid transition metal catalyst component (A) in terms of titanium atoms were charged. Then, after the temperature was raised to 60°C, ethylene supply was started, and ethylene was supplied for 4 hours so that the total pressure at 65°C was maintained at 2.5 kg / cm 2 g. After the polymerization, the temperature was lowered and the pressure was released to obtain 130 g of polymer. (The amount of polymer produced per 1 g of the solid transition metal catalyst component (A) was 1,354 g.)

[0103] The intrinsic viscosity [η] of the obtained polymer was 12.0 dl / g. In addition, the average particle diameter of the polymer was 8.0 μm, and the particle size distribution was such that the powder having a particle diameter in the range of 0 to 40 μm accounted for 92.2% by mass. The titanium atoms in the obtained polymer were 36 ppm and the...

Embodiment 3

[0111] The polymer obtained in Example 1 was filled in a sealable container and heated at a temperature of 170° C. for 1 hour to obtain a homogeneous sintered filter free from molding unevenness.

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Abstract

Disclosed are super high molecular weight polyolefin fine particles having small particle diameters and a narrow particle size distribution. Also disclosed are a molded body made of such super high molecular weight polyolefin fine particles, and a sintered filter obtained by sintering molding the super high molecular weight polyolefin fine particles. Specifically disclosed are super high molecular weight polyolefin fine particles containing 1-50 ppm of titanium atoms and 1-1000 ppm of aluminum atoms. The super high molecular weight polyolefin fine particles are characterized in that [A] the limiting viscosity [Eta] as measured in decalin at 135 DEG C is not less than 5 dl / g, [B] the average particle diameter is not more than 20 [mu]m, and [C] particles having a diameter within the range of 0-40 [mu]m are contained in an amount of not less than 90% by mass.

Description

technical field [0001] The invention relates to ultra-high molecular weight polyolefin microparticles with narrow particle size distribution and small average particle diameter. Background technique [0002] Ultra-high molecular weight polyolefins represented by ultra-high-molecular-weight polyethylene are being used for mechanical parts, lining materials, sports Supplies and many other uses. [0003] However, when forming a filter from ultra-high molecular weight polyolefin, the fluidity of the ultra-high molecular weight polyolefin is poor when it is melted, so instead of the usual melt molding, rotational molding or direct molding of polyolefin powder is used. Powder molding method, etc., but the resulting filter does not have sufficient filtering performance. [0004] As the resin used for powder molding, it goes without saying that the smaller the particle size and the narrower the particle size distribution of the powder, the more preferable it is to consider the uni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F4/654A61K8/26C08J9/24A61K8/29C08L21/00A61K8/81C08L23/02B01D39/16
CPCA61Q19/00A61K8/8111C08F110/02A61K8/26B01D39/1661C08F10/00C08L23/06C08L2314/06A61K8/29C08L23/02Y10T428/2982C08F2410/06C08F4/6543C08L2666/02C08L2666/04C08L2666/08C08F2500/01C08F2500/17C08F2500/24
Inventor 安田和朋松本哲博水本邦彦
Owner MITSUI CHEM INC