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Ethylene copolymer composition and uses thereof

A technology of ethylene copolymers and olefin copolymers, which is applied in the field of ethylene copolymer compositions, and can solve problems such as reduced moldability, unstable bubbles, and low transparency

Inactive Publication Date: 2008-07-02
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] As mentioned above, polymers with high melt tension show excellent moldability due to good bubble stability, but they have high flow activation energy (Ea), which means that their molding conditions are greatly affected by temperature
Therefore, if the molding conditions are not very strictly and uniformly controlled, the resulting molded product will be uneven
For example, the transparency of the film is low
[0008] When the flow activation energy (Ea) is low, the occurrence of inhomogeneity in the molded product can be suppressed, but because the melt tension is low, unstable bubbles are generated, and the moldability decreases

Method used

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  • Ethylene copolymer composition and uses thereof

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Experimental program
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Effect test

preparation example Construction

[0328] In the preparation of the prepolymerized catalyst, based on the transition metal atoms in the component (b), the amount of component (b) is usually 10 -6 to 2×10 -2 mol / L solvent, preferably 5×10 -5 to 10 -2 Mole / liter solvent; The consumption of component (b) in 1 gram carrier (c) is 5 * 10 -6 up to 5×10 -4 Mole, preferably 10 -5 to 2×10 -4 Moore. The atomic ratio (Al / transition metal) of aluminum (Al) in component (a) to transition metal in component (b) is generally in the range of 10 to 500, preferably 20 to 200. The atomic ratio (Al-d / Al-a) of the aluminum atom (Al-d) in the optional component (d) to the aluminum atom (Al-a) in the component (a) is generally in the range of 0.02 to 3, preferably 0.05 to 1.5.

[0329] The consumption of solid catalyst component is usually 10% in terms of the transition metal in the transition metal compound -6 to 2×10 -2 mol / L solvent, preferably 5×10 -5 to 10 -2 mol / liter of solvent.

[0330] The prepolymerization temp...

Embodiment

[1112] The present invention is further described with reference to the following examples, but it should be understood that the present invention is not limited by these examples.

[1113] Film properties were evaluated in the following manner.

[1114] Haze

[1115] Haze was measured according to ASTM-D-1003-61.

[1116] luster

[1117] Gloss was measured in accordance with JIS Z8741.

[1118] Dart impact strength

[1119] Dart impact strength was determined according to ASTM D 1709, Method A.

preparation Embodiment 1

[1121] Preparation of Catalyst Components

[1122] 5.0 kg of silica which had been dried at 250°C for 10 hours was suspended in 80 liters of toluene, and the suspension was cooled to 0°C. Then, 28.7 liters of a toluene solution of methylaluminoxane (Al: 1.33 mol / liter) was added dropwise to the suspension over 1 hour. During the dropwise addition, the temperature of the system was kept at 0°C. The reaction was continued at 0°C for 30 minutes. Thereafter, the temperature was raised to 95° C. within 1.5 hours, and the reaction was carried out at this temperature for 20 hours. The temperature was then lowered to 60°C and the supernatant was removed by decanting.

[1123] The resulting solid was washed twice with toluene and then suspended in 80 liters of toluene. At 80°C, within 30 minutes, 20.0 liters of toluene solution (Zr: 14.0 mmol / liter) of bis(methylcyclopentadienyl) zirconium dichloride was added dropwise to the system, and the reaction was continued at 80°C for 2 Ho...

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Abstract

The present invention provides ethylene copolymer compositions excellent in transparency, mechanical strength and moldability. The ethylene copolymer composition contains (B) an ethylene / α-olefin copolymer, (C) an ethylene / α-olefin copolymer, and a high-pressure radical process low-density polyethylene. The ethylene / α-olefin copolymer is a copolymer of ethylene and an α-olefin having 6 to 8 carbon atoms. The (B) ethylene / α-olefin copolymer has the properties of (B-i) to (B-vii), and the (C) ethylene / α-olefin copolymer has the properties of (C-i) to (C-v). High-pressure radical low-density polyethylene has properties (E-i) to (E-ii). The ratio of the melt flow rate (MFR(C)) of the copolymer (C) to the melt flow rate (MFR(B)) of the copolymer (B) satisfies the following condition: 1<(MFR(C)) / (MFR (B))≤20. The composition can be used to prepare molded articles such as films, sheets, packaging materials, injection molded products, expansion molded products and fibers. The molded article has excellent mechanical strength, heat resistance or transparency.

Description

[0001] This application is that the international application number is PCT / JP99 / 01144, and the national application number after the PCT international patent application on March 10, 1999 entered the national phase is 99800239.9, and the invention name is "ethylene copolymer composition and its use" of the divisional application of the Chinese patent application. technical field [0002] The present invention relates to ethylene copolymer compositions and their use. The invention also relates to the use of the ethylene copolymer composition. Background technique [0003] Ethylene copolymers can be molded by various molding methods and are used in many fields. The required properties of ethylene copolymers vary according to the molding method and the use of the copolymer. For example, in the process of high-speed molding of blown film, it is necessary to select an ethylene copolymer whose molecular weight has high melt tension to stably perform high-speed molding without b...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08C08J5/18C08J9/04H01B3/44H01B7/18C08F4/642D01F6/30
CPCD01F6/30H01B3/441C08L23/0815C08L2314/06C08L2666/04C08L23/08
Inventor 高桥守中川贵杉村健司吉次健
Owner MITSUI CHEM INC
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