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Low molecular weight polyethylene with dual-peak distribution of molecular weight and its preparing process and application

A molecular weight distribution, low molecular weight technology, applied in the field of low molecular weight ethylene polymers

Inactive Publication Date: 2003-01-22
BEIJING RES INST OF CHEM IND CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, there is no report on the bimodal distribution of low molecular weight polyethylene

Method used

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  • Low molecular weight polyethylene with dual-peak distribution of molecular weight and its preparing process and application
  • Low molecular weight polyethylene with dual-peak distribution of molecular weight and its preparing process and application
  • Low molecular weight polyethylene with dual-peak distribution of molecular weight and its preparing process and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 (1) Preparation of catalyst: the titanium-containing active component is prepared according to the method and conditions disclosed in Example 1 in the specification of Chinese Patent 85100997.2 to obtain a solid catalyst wherein the titanium content is 2.62%, the magnesium content is 17.01%, and the chlorine content is 55.88%, ester content 14.36%. (2) Ethylene polymerization: In a two-liter high-pressure stainless steel polymerization kettle equipped with a stirring and temperature-regulating device, fully replace with hydrogen, add one liter of heptane, 63.8 mg of the above-mentioned solid catalyst, and 10 ml of triethylaluminum, and start to heat up. At 70°C, the partial pressure of heptane is 0.04MPa, add hydrogen to 1.49Mpa (the amount of hydrogen added is 11.6 standard liters), then feed ethylene until the total pressure is 1.6Mpa, continue to heat up to 86°C, and maintain this temperature for two After one hour, the discharge obtained white polyethyl...

Embodiment 2

[0025] Embodiment 2 (1) Catalyst selection: Same as Example 1 (2) Ethylene polymerization: In a two-liter high-pressure stainless steel polymerization kettle equipped with stirring and temperature adjustment devices, fully replace with hydrogen, add one liter of heptane, the above-mentioned 42mg of solid catalyst, 10ml of triethylaluminum, start to heat up, when it reaches 70°C, the partial pressure of heptane is 0.04MPa, add hydrogen to 0.84Mpa (the amount of hydrogen added is 6.4 standard liters), then feed ethylene until the total pressure is 1.0Mpa, continue to heat up to 86°C, maintain this temperature for two hours, and then discharge to obtain white polyethylene powder (results are shown in Table 1). (3) Test polymer: polymer apparent density BD is 0.30g / cm 3, catalyst efficiency is 140kg polymkeric substance / g titanium, with the Waters150C instrument of U.S. production, tested the molecular weight and molecular weight distribution of product, the number average molecul...

Embodiment 3

[0026] Embodiment 3 (1) Selection of the catalyst system: the titanium-containing active component is prepared according to the method and conditions disclosed in Example 7 in the specification of Chinese Patent 85100997.2 to obtain a solid catalyst wherein the titanium content is 2.20%, and the magnesium content is 17.86%. The chlorine content is 59.34%, and the ester content is 5.9%. (2) Ethylene polymerization: Carry out ethylene polymerization in the same way as in Example 2, and the results are listed in Table 1. (3) Polymer test: polymer apparent density BD is 0.30g / cm 3 , the catalyst efficiency is 100kg polymer / g titanium. On the Waters150C instrument made in the United States, the molecular weight and molecular weight distribution of the product are tested. The number average molecular weight of the polymer is 2980, and the product is bimodal. In addition, the PERKIN-ELMER differential thermal scanning A scan was made on the calorimeter DSC7, and the melting points w...

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Abstract

The present invention relates to a low-molecular ethylene polymer with the number average molecular weight of 1500-6000 and molecular weight distribution MW / Mn of 20-50. It features that the molecular weight distribution curve measured by gel permeation chromatography has dual peaks and the fusion ranges of dual peaks on the curve measured by scanned heat difference thermolysis are respectively 90-130 deg.C and 130-150 deg.C. The process for preparing the said polymer and the application of said polymer in electrostatic copying ink powder are disclosed.

Description

technical field [0001] The present invention relates to a kind of low molecular weight ethylene polymer, more particularly, relates to a kind of ethylene polymer with bimodal distribution, the present invention also relates to the preparation method of this ethylene polymer and its use as a dispersant for electrophotographic toner application. Background technique [0002] Low-molecular-weight polyethylene mainly replaces traditional paraffin in practical applications, but compared with paraffin, low-molecular-weight polyethylene has the advantages of high melting point and high temperature stability, so it is widely used in resin blending and processing modification Auxiliaries, hot melt adhesive additives, printing ink wear-resistant agents, wax product modifiers, electrostatic copying toner carriers, cosmetic additives, cable coil encapsulation fillers and other fields. [0003] At present, there are many patents disclosing the production method of low molecular weight p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02
Inventor 陈齐王志平陈颖于美玉赵自忠
Owner BEIJING RES INST OF CHEM IND CHINA PETROLEUM & CHEM CORP
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