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Ultrahigh-molecular ethylene polymer

An ethylene polymer and ultra-high molecular weight technology, which is applied in the field of producing the ultra-high molecular weight ethylene polymer, can solve the problems of incomplete utilization of properties, residues, weak physical properties, etc.

Inactive Publication Date: 2008-04-09
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] UHMWPE produced using a metallocene catalyst has a narrow molecular weight distribution (Mw / Mn) of 3 or less, and therefore an improvement in impact strength can be expected, but since the amount of low-molecular-weight components is small, Therefore, it is usually difficult to heat-melt polyethylene in the molding process, and the unmelted part cannot be completely fused, resulting in uneven molded products
Therefore, the problem is that the physical properties of these unfused parts are weak, and although these products are originally high impact strength materials, their properties cannot be fully utilized.
In addition, this type of polyethylene is difficult to dissolve uniformly in the plasticizer and remains as an undissolved part, which tends to affect the strength and film properties of the product
In addition, there is also a problem that it is difficult to exert the necessary stretchability when stretching is required, such as in the case of forming fibers, due to increased intermolecular entanglement
However, the molecular weight of the resulting ethylene polymers is limited due to the use of chain transfer agent hydrogen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9 and comparative example 1-4

[0253] The present invention is described in detail below with reference to Examples and Comparative Examples. The present invention is by no means limited by these Examples. The measurement methods used in Examples and Comparative Examples are as follows.

[0254] [Measurement of Mw / Mn]

[0255] Using a 150-CA LC / GPC device (Waters Corporation), ShodexAT-807S (purchased from Showa Denko K.K.) and TSK-gel GMH-H16 (purchased from Tosoh Corporation) were used as columns in series, and a three-phase column containing 10 ppm IRGANOX1010 (Ciba Specialty Chemicals) was used. Chlorobenzene was used as solvent and measurements were carried out at 140 °C. A commercially available monodisperse polystyrene was used as a reference material to generate a calibration curve.

[0256] [Measurement of viscosity average molecular weight]

[0257] 2 mg of the polymer was added to 20 ml of decalin, and stirred at 150° C. for 2 hours to dissolve the polymer. Use the Ubbelohde viscometer to meas...

Embodiment 1

[0279] (preparation of compound (D) with hydrogenation ability)

[0280] A 3% by weight hexane suspension containing 30 mmol titanocene dichloride (available from Wako Pure Chemical Industries, Ltd.) and 60 mmol 1M trimethylaluminum hexane solution was stirred at room temperature for 100 hours to prepare Tebbe's reagent.

[0281] (Polymerizing ethylene: Preparation of ethylene homopolymer (A))

[0282] Isobutane, ethylene, hydrogen, metallocene catalyst, and Tebbe's reagent were continuously fed into a vessel-type polymerization reactor equipped with a stirrer to produce polyethylene (ethylene homopolymer) at a productivity of 10 kg / Hr. Hydrogen purified to 99.99 mol % or higher by contact with molecular sieves is used. Using [(N-tert-butylamino) (tetramethyl-η 5 -cyclopentadienyl)dimethylsilyl]titanium-1,3-pentadiene, bis(hydrogenated tallow alkyl)methylammonium-tris(pentafluorophenyl)(4-hydroxyphenyl)boron A catalyst obtained by loading a mixture of triethylaluminum salt ...

Embodiment 2

[0284] Polymerization was performed in the same manner as in Example 1, except that Tebbe's reagent was fed at a rate of 0.013 mmol / hour. In this case, no bulk polymer was produced, nor was the slurry discharge pipe blocked, and stable continuous operation was achieved. The resulting polyethylene had an average molecular weight of 2,100,000 as determined by intrinsic viscosity (135° C.) in decalin, a density of 0.9300 g / cc and a crystallinity of 52%. The results of these and other measurements for this example are shown in Table 1.

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Abstract

An ultrahigh-molecular ethylene polymer which is either an ethylene homopolymer (A) or an ethylene copolymer (B) obtained by copolymerizing a) 99.9 to 75.0 wt.% ethylene with b) 0.1 to 25.0 wt.% at least one olefin comonomer selected from the group consisting of C3-20 alpha-olefins, C3-20 cycloolefins, compounds represented by the formula CH2=CHR (wherein R is C6-20 aryl), and C4-20 linear, branched, or cyclic dienes, and which has i) a viscosity-average molecular weight of 1,000,000 or higher, ii) a molecular-weight distribution (Mw / Mn) of 3 or higher, and iii) a titanium content of 3 ppm or lower and a chlorine content of 5 ppm or lower.

Description

technical field [0001] The present invention relates to an ultrahigh molecular weight ethylene polymer (ethylene homopolymer or ethylene copolymer) having an ultrahigh molecular weight of 1,000,000 or more, a molecular weight distribution greater than 3, and a small residual amount of Ti and Cl in the polymer, and the production of the ultrahigh molecular weight ethylene polymer (ethylene homopolymer or ethylene copolymer). Process for high molecular weight ethylene polymers. Background technique [0002] Ultra-high molecular weight polyolefins, especially ultra-high molecular weight polyethylene, have excellent impact strength, abrasion resistance, slip properties, and chemical resistance compared with widely used polyethylene, which can be used for sliding parts and are therefore listed as An engineering plastic. Furthermore, after uniform mixing with plasticizers such as paraffin oil, they are extruded into sheets, films or fibers, or stretched in some cases and then use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F4/606
Inventor 宫本浩一野崎贵司藤原昭夫
Owner ASAHI KASEI CHEM CORP
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