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Ethylene copolymer

A technology of copolymer and ethylene, which is applied in the field of ethylene-α-olefin copolymer with excellent extrusion processability, can solve the problems that may not meet the requirements of appearance, and achieve the effect of excellent extrusion processability

Active Publication Date: 2004-11-03
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the ethylene copolymer disclosed in the above-mentioned JP4-213309A has a high melt tension, which does not necessarily meet the requirements for the appearance of extruded products prepared from the copolymer, so it has been required to further improve the extrusion processability and performance of the ethylene copolymer. Balance between appearance and impact strength of extruded products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] [Preparation of co-catalyst carrier (A)]

[0142] 1.5 liters of tetrahydrofuran and 1.35 liters (2.7 mol) of a hexane solution (2 mol / l) of diethylzinc were added to a 5 liter four-necked flask whose air was replaced with nitrogen, and cooled to 5°C. A solution (0.2 kg (1 mol) of pentafluorophenol dissolved in 500 ml of tetrahydrofuran) was added dropwise thereto over 60 minutes. After the dropwise addition, the solution was stirred at a temperature of 5°C for 60 minutes, the temperature was raised to 45°C over at least 28 minutes, and then stirred for 60 minutes. The solution was cooled to a temperature of 20° C. in an ice bath, and then 45 g of water (2.5 mol) were added dropwise thereto within 90 minutes. Thereafter, the solution was stirred at 20°C for 60 minutes, the temperature was raised to 45°C over at least 24 minutes, and then stirred for 60 minutes. Then, the solvent was removed by distillation under reduced pressure for 120 minutes, during which time the s...

Embodiment 2

[0151] [Preparation of prepolymerization catalyst]

[0152] Pre-polymerization is carried out in the same manner as Example 1, just using 100 liters of butane, 30 liters of hydrogen and 0.1MPa of ethylene, so that the pre-polymerization of 32 grams of ethylene polymers with 1 gram of the above-mentioned cocatalyst carrier (A) A prepolymerized catalyst is obtained.

[0153] [polymerization]

[0154] Using the prepolymerized catalyst obtained above, ethylene and 1-hexene were copolymerized in the same manner as in Example 1 in a continuous fluidized bed gas phase reactor. Only the molar ratio of hydrogen to ethylene was 0.21%, and the molar ratio of 1-hexene to ethylene was 1.6%.

[0155] [knead]

[0156] 1000ppm of calcium stearate, 2000ppm of Irgnox 1076 (manufactured by CIBA-GEIGY JAPAN LIMITED) and 1600ppm of P-EPQ (manufactured by CIBA-GEIGY JAPAN LIMITED) were added to the ethylene-1-hexene copolymer powder prepared above to use BT40 - 36L co-rotating twin-screw extrud...

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PUM

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Abstract

The invention provides an ethylene-alpha-olefin copolymer which is superior in extrusion molding processability. The present invention is to provide a copolymer of ethylene and alpha-olefin of from 4 to 20 carbon atoms, having melt flow rate of from 1 to 100 g / 10 min, an activation energy for melt flow of 60 kJ / mol or more, melt tension at 190 DEG C. (MT), intrinsic viscosity ([eta]) and a chain length A which satisfy the formula (1) to (3), wherein the chain length A is a chain length at peak position of a logarithm normal distribution curve of a component having the highest molecular weight among logarithm normal distribution curves obtained by dividing a chain length distribution curve obtained by gel permeation chromatography measurement into at least two logarithm normal distribution curves.

Description

technical field [0001] The present invention relates to ethylene-α-olefin copolymers, more specifically, to ethylene-α-olefin copolymers excellent in extrusion molding processability. Background technique [0002] Ethylene polymers are generally used in many fields, such as extrusion molding products, such as film, sheet and so on. The molding processability (determined by extrusion torque, melt tension, etc.), mechanical properties (such as stiffness, impact strength, etc.) and appearance (optical properties) of extruded products (such as the surface smoothness of film or sheet) are required. , gloss and transparency, etc.) are excellent. [0003] For example, JP4-213309A discloses an ethylene copolymer comprising repeating units derived from ethylene and repeating units derived from an α-olefin of 3 to 20 carbon atoms with a density of 0.86 to 0.95 g / cm 3 , MFR is 0.001-50 g / 10 minutes, melt tension and MFR meet a specific relationship, and the temperature and density at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/02C08F4/6592C08F10/02C08F210/16
CPCC08F4/65927C08F210/16C08F10/02C08F4/65912C08F4/65908C08F210/14C08F2500/12C08F2500/17C08F2500/20C08F2500/11
Inventor 井关优树铃木靖朗三野直弘
Owner SUMITOMO CHEM CO LTD