Catalysts for olefin polymerization, process for production of the catalysts, and method for preservation thereof

A technology of olefin polymerization and manufacturing method, which is applied in the field of catalysts for olefin polymerization, can solve the problems of high energy consumption, poor dispersion of antioxidants, low efficiency, etc., and achieve the effects of energy reduction, excellent long-term preservation, and good powder properties

Active Publication Date: 2011-01-12
JAPAN POLYPROPYLENE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The conventional polymerization method of polyolefin, which melt-kneads and mixes antioxidants after polymerization for stabilization, consumes a lot of energy, and the efficiency is very low. In order to solve the poor dispersion of antioxidants, it is necessary to add more than the required amount of antioxidants. In view of the above disadvantages of the prior art, the object of the present invention is to provide a melting and kneading process that does not need to use a large amount of energy or other addition processes different from this, to manufacture a compound that effectively adds a small amount of antioxidant and is easy to operate. Catalyst for olefin polymerization of polyolefin resin with large particle size, method for producing catalyst for olefin polymerization, and method for storing same

Method used

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  • Catalysts for olefin polymerization, process for production of the catalysts, and method for preservation thereof
  • Catalysts for olefin polymerization, process for production of the catalysts, and method for preservation thereof
  • Catalysts for olefin polymerization, process for production of the catalysts, and method for preservation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0271] (1) Synthesis of catalyst

[0272] 1700 g of pure water was added to a 5 L detachable flask equipped with a stirring blade and a reflux device, and 500 g of 98% sulfuric acid was added dropwise. Further, 300 g of granulated montmorillonite (manufactured by Mizusawa Chemical Industry Co., Ltd., Benclay SL) with an average particle diameter of 45 μm was added, followed by stirring. Then, it was reacted at 90° C. for 2 hours. The slurry was filtered and washed. 1230 g of 27% lithium sulfate aqueous solution was added to the recovered filter cake, and it was made to react at 90 degreeC for 2 hours. The slurry was filtered, and then washed so that the pH of the filtrate became 4 or higher. The recovered filter cake was pre-dried at 100°C and then dried at 200°C for 2 hours. As a result, 275 g of chemically treated montmorillonite was obtained. The average particle diameter was 43 μm, the shape was spherical, and the number of particles whose M / L value was 0.8 to 1.0 was...

Embodiment 2

[0283] A polymer was obtained in the same manner as in Example 1 except that the polymerization time in Example 1(3) was changed to 15 minutes. The polymer produced was 50 g. This polymer was evaluated for stabilization in the same manner as in Example 1. Table 1 shows the evaluation results. MFRs are stable.

Embodiment 3

[0291] (1) Prepolymerization

[0292] After preparing the catalyst in the same manner as in Example 1, tetrakis[methylene-3-(3', 5'-di-tert-butyl-4'-hydroxyphenyl) was used as a phenolic stabilizer in a 50 ml flask. ) propionate] 5 ml of 30% by weight heptane solution of methane and 5 ml of 30% by weight heptane solution of tris(2,4-di-tert-butylphenyl phosphite) as a phosphorus stabilizer were mixed, and then added to Stir in the above 1 L flask for 30 minutes.

[0293] All of the above-mentioned slurry was introduced into a stirring autoclave having an internal volume of 1.0 L after being sufficiently replaced with nitrogen. When the temperature was stabilized at 40°C, propylene was supplied at a rate of 10 g / hour to maintain the temperature. After 2 hours, the supply of propylene was stopped and maintained for another 1 hour. After the prepolymerization was finished, the residual monomers were removed, the stirring was stopped, and the slurry was pumped into a 1L flask f...

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Abstract

Olefin polymerization catalysts for producing polyolefin resins which can dispense with a melt-kneading step necessitating great energy or a substitute addition step therefor and to which small amounts of antioxidants have been effectively added; and a process for the production of the catalysts. Specifically, a catalyst for olefin polymerization characterized by being prepared by conducting prepolymerization in the presence of [I] a solid catalyst for olefin polymerization having a mean particle diameter of 10 to 200[mu]m, [II] an antioxidant for resins, and [III] an olefin; and a catalyst for olefin polymerization characterized by containing [IV] an organoaluminum compound in addition to the components [I] to [III].

Description

technical field [0001] The present invention relates to a catalyst for olefin polymerization, a method for producing a catalyst for olefin polymerization and a method for storing the same, more specifically, it relates to a catalyst for olefin polymerization capable of producing a polyolefin resin with good stability, containing an antioxidant and obtained by prepolymerization, A method for producing a catalyst for olefin polymerization and a method for storing the same. technical background [0002] The polyolefin produced by using the conventional solid catalyst component for olefin polymerization, because the catalyst metal or halogen compound remains in the polymer, which seriously damages the stability of the polymer, so it is treated with alcohols or chelating agents, and then washed with water Processes such as treatment to remove catalyst residues. However, in recent years, due to the high activation of polymerization catalysts, the number of catalyst-derived compou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F4/65C08F2/44
Inventor 寒河江竹弘
Owner JAPAN POLYPROPYLENE CORP
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