Unlock instant, AI-driven research and patent intelligence for your innovation.

Ethylene-based polymer and application

A polymer and ethylene-based technology, applied in the field of ethylene-based polymers, can solve the problems of poor resistance to environmental stress damage, long-term life, poor physical properties, reduced mechanical strength, and wide molecular weight distribution.

Active Publication Date: 2009-09-23
MITSUI CHEM INC
View PDF17 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is what causes the reduction in mechanical strength
In addition, due to the presence of long chain branches, molecular expansion is reduced and the molecular weight distribution is wide, so long-term physical properties such as environmental stress crack resistance (ESCR) are poor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ethylene-based polymer and application
  • Ethylene-based polymer and application
  • Ethylene-based polymer and application

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0196] [Preparation of solid catalyst component (α)]

[0197] 8.5 kg of silica dried at 200° C. for 3 hours was prepared into a suspension with 33 liters of toluene, and then 82.7 liters of a methylaluminoxane solution (A1=1.42 mol / liter) was added dropwise over 30 minutes. Then, the temperature was raised to 115° C. over 1.5 hours, and the reaction was carried out at this temperature for 4 hours. Then the temperature was lowered to 60° C., and the supernatant was removed by decantation. The obtained solid catalyst component was washed three times with toluene, and then resuspended with toluene to obtain a solid catalyst component (α) (total volume: 150 liters).

Synthetic example 2

[0199] [Preparation of supported catalyst]

[0200]In a reactor fully replaced with nitrogen, 19.60 mol of the solid catalyst component (α) synthesized in Synthesis Example 1 suspended in toluene was added in terms of aluminum, and the suspension was stirred at room temperature (20 ~25°C), add 2 liters (61.12 mmol) of bis(p-tolyl) methylene (cyclopentadienyl) (octamethyloctahydrodibenzofluorenyl) zirconium dichloride 31.06 (mmol / liter) The solution was then stirred for 60 minutes. After the stirring was stopped, the supernatant was removed by decantation, washed twice with 40 liters of n-hexane, and the obtained carrier catalyst was redispersed in n-hexane to form 25 liters of catalyst suspension to obtain the solid catalyst component (γ).

[0201] [Preparation of solid catalyst component (δ) by prepolymerization of solid catalyst component (γ)]

[0202] Under a nitrogen atmosphere, add 15.8 liters of refined n-hexane and the above-mentioned solid catalyst component (γ) to a...

Embodiment 1b

[0204] [polymerization]

[0205] 45 (liter / hr) of hexane, 0.07 (mmol / hr) of Zr atoms in conversion of the solid catalyst component (δ) obtained in Synthesis Example 2, 20 (mmol / hr) of triethylaluminum, 7.0 (kg / hr) of ethylene, Hydrogen 40 (N-liter / hr) is continuously supplied to the first polymerization tank, and then continuously supplied at 0.5 g / hr with a B-type viscometer at 25 ° C. The viscosity measured at 25 ° C is 500 (mPa·s). Alcohol) (polypropylene glycol) block copolymer (manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd., trade name EPAN720), and while continuously taking out the contents of the polymerization tank to keep the liquid level in the polymerization tank constant, at a polymerization temperature of 80 ° C. Reaction pressure 7.6(kg / cm 2 G), carry out polymerization under the condition of average residence time 2.6hr.

[0206] The contents that are continuously taken out from the first polymerization tank are kept at an internal pressure of 0.30 (kg...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The present invention relates to an ethylene-based polymer capable of providing a molded product with excellent fluidity and moldability and excellent mechanical strength, containing 0.02 to 1.50 mol% of structural units derived from α-olefins with 6 to 10 carbon atoms, The density is 945~975kg / m3, and the following conditions [1] and [2] are satisfied at the same time. [1] In CFC, all components with a molecular weight of 100,000 or more elute at a temperature of 85°C or higher. [2] The amount of components eluted at 80°C or lower is 5% or less relative to the total amount of CFC eluted.

Description

technical field [0001] The present invention relates to an ethylene-based polymer capable of providing a molded article having excellent fluidity, moldability, mechanical strength and many other characteristics, and a molded article made of the same. Background technique [0002] High-density polyethylene used in various applications such as films, tubes, and bottles has long been produced using Ziegler-Natta catalysts or chromium-based catalysts. However, these catalysts have limitations in controlling the molecular weight distribution and composition distribution of polymers. [0003] In recent years, several methods of producing ethylene-based polymers excellent in formability and mechanical strength by using a single-site catalyst that is easy to control the composition distribution and using a continuous polymerization method have been disclosed. Small ethylene homopolymers or ethylene-α-olefin copolymers, and relatively large molecular weight ethylene homopolymers or ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/16
Inventor 冈本胜彦笠井彻志土肥靖远藤浩司绪续士郎明石崇弘岩政健司平瀬善幸福士景子永野伸一
Owner MITSUI CHEM INC