Polymerization catalyst activator and catalyst for polyethylene production containing the same

Abstract

To provide an activator for polymerization catalysts that makes it possible to produce ethylene polymer particles with a narrow molecular weight distribution and a narrow particle size distribution while achieving a high level of activity, and a catalyst for the production of polyethylene comprising the same.SOLUTION: An activator for polymerization catalysts comprises organic modified clay particles, which are organic modified clay having organic aliphatic groups, characterized by a) a median size of 8 μm or more and 20 μm or less, b) a geometric standard deviation of particle size of 0.15 or less, and c) the proportion of particles with a circularity of 0.9-1 in all the particles being less than 90 wt.%, and d) a specific surface area of 2 m2 / g or more as determined by the BET method.SELECTED DRAWING: None

Claims

1. The organically modified clay has an organic aliphatic group represented by the following general formula (1) as an organic modification group, and a) the median diameter is 8 μm or more and 20 μm or less, b) the geometric standard deviation of the particle size is 0.15 or less, c) the proportion of particles with a circularity of 0.9 to 1 among all particles is less than 90% by weight, and d) the specific surface area determined by the BET method is 2 m². ２ An activator for polymerization catalysts, characterized by being organically modified clay particles with a concentration of 1 / g or more. 【Chemistry 1】 （１） (In the formula, R １ , R ２ , R ３ Each of these is independently a saturated alkyl group having 1 to 30 carbon atoms, an unsaturated alkyl group having 2 to 30 carbon atoms, an alkoxy group having 1 to 30 carbon atoms, an alkylamino group having 1 to 30 carbon atoms, an alkylsilyl group having 1 to 30 carbon atoms, an alkoxyalkylene group having 2 to 30 carbon atoms, a dialkylaminoalkylene group having 3 to 30 carbon atoms, and a trialkylsilylalkylene group having 4 to 30 carbon atoms, and R １ , R ２ , R ３ At least one of them is a saturated alkyl group or an unsaturated alkyl group having 10 or more carbon atoms, M １ (It is an atom in Group 15 of the periodic table.)

2. The polymerization catalyst activator according to claim 1, characterized in that it is an activator for transition metal compounds and is for use as a single-site polymerization catalyst.

3. A metallocene compound (A) represented by the following general formula (2) or (3), 【Chemistry 2】 （２） 【Transformation 3】 （３） [wherein, M ２ and M ３ is a titanium atom, a zirconium atom or a hafnium atom, X is each independently a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkylamino group having 1 to 20 carbon atoms, an alkylsilyl group having 1 to 20 carbon atoms, an alkoxyalkylene group having 2 to 20 carbon atoms, a dialkylaminoalkylene group having 3 to 20 carbon atoms, or a trialkylsilylalkylene group having 4 to 20 carbon atoms, R ４ and R 7 are a cyclopentadienyl group represented by the following general formula (4) or an indenyl group represented by the following general formula (5), 【Chemistry 4】 （４） 【Transformation 5】 （５） (In the formula, R ９ ~R １２ and R １３ ~R １８ Each of these is independently a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, an alkylamino group having 1 to 20 carbon atoms, an alkylsilyl group having 1 to 20 carbon atoms, an alkoxyalkylene group having 2 to 20 carbon atoms, a dialkylaminoalkylene group having 3 to 20 carbon atoms, and a trialkylsilylalkylene group having 4 to 20 carbon atoms. R 5 and R ８ is an indenyl group represented by the above general formula (5) or a fluorenyl group represented by the following general formula (6), 【Transformation 6】 （６） (In the formula, R １９ ~R ２６ Each of these is independently a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, an alkylamino group having 1 to 20 carbon atoms, an arylamino group having 6 to 30 carbon atoms, an arylalkylamino group having 7 to 30 carbon atoms, an alkylsilyl group having 1 to 20 carbon atoms, an alkoxyalkylene group having 2 to 20 carbon atoms, a dialkylaminoalkylene group having 3 to 20 carbon atoms, and a trialkylsilylalkylene group having 4 to 20 carbon atoms. R ６ R is represented by the following general formula (7) or general formula (8). ４ It is a bridge unit of R 5, 【Transformation 7】 （７） 【Transformation 8】 （８） (In the formula, R ２７ ~R ２８ and R ２９ ~R ３０ Each of these is independently a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 30 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkylamino group having 1 to 20 carbon atoms, an alkylsilyl group having 1 to 20 carbon atoms, an alkoxyalkylene group having 2 to 20 carbon atoms, a dialkylaminoalkylene group having 3 to 20 carbon atoms, and a trialkylsilylalkylene group having 4 to 20 carbon atoms. ４ (These are silicon atoms, germanium atoms, or tin atoms.) l is an integer between 1 and 5. As organically modified clay particles (B), the polymerization catalyst activator according to claim 1 or 2, A catalyst for polyethylene production, characterized by comprising an organoaluminum compound (C).

4. The catalyst for polyethylene production according to claim 3, characterized in that the organoaluminum compound (C) is any of trimethylaluminum, triethylaluminum, tri-n-propylaluminum, tri-iso-propylaluminum, tri-n-butylaluminum, tri-iso-butylaluminum, or tri-tert-butylaluminum.

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