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Super high molecular weight ethylene-alpha-olefin copolymer powder

An olefin copolymer, ultra-high molecular weight technology, applied in transportation and packaging, thin material processing, etc., can solve the problems of reduced mechanical strength, insufficient transparency, increased extracts, etc., and achieve the effect of excellent powder properties

Inactive Publication Date: 2010-05-26
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the composition distribution of the ultra-high molecular weight ethylene-α-olefin copolymer described in Japanese Patent Publication No. 5-86803 is wide, so even if the content of the α-olefin unit of the comonomer is increased, the melting point cannot be lowered sufficiently, and the The content of α-olefin units leads to a significant increase in extractables, a decrease in mechanical strength, and insufficient transparency
[0004] In addition, compared with ordinary polyethylene, ultra-high molecular weight polyethylene has significantly higher melt viscosity and poor molding processability, so it is often used in powder state (powder) in molding. Therefore, it needs to have a large bulk density and good fluidity. Ultra-high molecular weight polyethylene with powder characteristics

Method used

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  • Super high molecular weight ethylene-alpha-olefin copolymer powder
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  • Super high molecular weight ethylene-alpha-olefin copolymer powder

Examples

Experimental program
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Effect test

preparation example Construction

[0126] Preparation of solid catalyst component (A)

[0127] The solid catalyst component (A) can be obtained by using a titanium compound (ii) represented by the general formula [I] in the presence of an organosilicon compound (i) having a Si-O bond, using an organomagnesium compound (iii) The reduction is carried out, and the obtained solid component (a) is brought into contact with the halide (b) and the phthalic acid derivative (c). The above contact treatment is usually carried out under an atmosphere of inert gas such as nitrogen or argon.

[0128] Specific methods of the contact treatment to obtain the solid catalyst component (A) include the following methods and the like.

[0129] ・The method of putting (b) and (c) in (a) (arbitrary order of putting) and performing contact processing

[0130] ・The method of putting (a) and (c) in (b) (arbitrary order of putting) and performing contact processing

[0131] ・The method of putting (a) and (b) (arbitrary order of putting...

Embodiment 1

[0207] (1) Synthesis of solid catalyst component precursor

[0208] exist figure 1 Shown possesses the 500ml cylindrical reactor of stirrer, baffle (the stirrer that has 3 pairs of diameter 0.053m, the stirrer of wide 0.010m and the reactor with the diameter 0.07m of 4 wide 0.007m baffles, The power number is 3.02) filled with nitrogen gas, 270 ml of hexane, 8.1 ml of tetrabutoxytitanium and 79.9 ml of tetraethoxysilane were added and stirred. Next, while keeping the temperature of the reactor at 5° C., 182 ml of a dibutyl ether solution of butylmagnesium chloride (concentration: 2.1 mol / liter) was added dropwise to the above stirred mixture over 4 hours. The stirring rotation speed at this time was 700 rpm. After completion of the dropping, the mixture was stirred at 20° C. for 1 hour, filtered, and the obtained solid was repeatedly washed three times with 280 ml of toluene, and then added toluene to make the total volume 250 ml for slurrying. A part of the slurry was coll...

Embodiment 2

[0218] (1) Synthesis of solid catalyst component precursor

[0219] Equipped with the same 500ml cylindrical reactor of stirrer and baffle as in Example 1 (1), nitrogen is filled, and 270ml of hexane, 16.8ml of tetrabutoxytitanium, and 75.5ml of tetraethoxysilane are dropped into it. and 6.0 ml of diisobutyl phthalate, and stirred. Next, while keeping the temperature of the reactor at 45° C., 182 ml of a dibutyl ether solution of butylmagnesium chloride (concentration: 2.1 mol / liter) was added dropwise to the above stirred mixture over 4 hours. The stirring rotation speed at this time was 1000 rpm. After completion of the dropping, the mixture was stirred at 45°C for 1 hour, filtered, and the obtained solid was repeatedly washed three times with 280 ml of toluene, and then added toluene to make the total volume 250 ml for slurrying. A part of the slurry was collected, the solvent was removed and dried to obtain a solid catalyst component precursor.

[0220] This solid catal...

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Abstract

The invention provides an ultrahigh molecular weight ethylene-alpha-olefin copolymer powder having an intrinsic viscosity of 5 dl / g or more, a DSC melting point of 122 DEG C. or less, an apparent bulk density of 0.30 g / cm<3> or more, and a flow-down rate of 20 g / 10 seconds or more. Also, provided is an ultrahigh molecular weight ethylene-alpha-olefin copolymer powder having an intrinsic viscosity of 5 dl / g or more, a DSC melting point of 122 DEG C. or less, a median diameter of 1 to 3000 [mu]m, and a particle size distribution parameter (SPAN) of 3 or less.

Description

technical field [0001] The present invention relates to low melting point ultrahigh molecular weight ethylene-α-olefin copolymer powder with excellent powder properties. Background technique [0002] Ultra-high molecular weight polyethylene has superior properties such as strength, abrasion resistance, impact resistance, self-lubrication, solvent resistance, and electrical insulation compared to general polyethylene, and can be used in various applications by utilizing these characteristics. Ultra-high molecular weight polyethylene has a high melting point and low transparency because it is highly crystalline polyethylene having a relatively high density. Therefore, in order to improve these points, for example, Japanese Patent Publication No. 5-86803 describes an ultrahigh molecular weight ethylene-α-olefin copolymer obtained by copolymerizing α-olefin as a comonomer with ethylene. [0003] However, the composition distribution of the ultra-high molecular weight ethylene-α...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F4/658
CPCC08F10/00C08F210/16Y10T428/2982C08F4/651C08F4/6565C08F210/06C08F2500/17C08F2500/10C08F2500/01C08F2500/18C08F2500/24C08F2500/12C08F210/08C08F4/658C08J3/12
Inventor 熊本伸一
Owner SUMITOMO CHEM CO LTD
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