Alkoxymagnesium, method for producing alkoxymagnesium, solid catalyst component for olefin polymerization, olefin polymerization catalyst, and method for producing olefin polymer

Patent metadata

Field	Value
Publication number	US-2020299422-A1
Application number	US-201716088158-A
Country	US
Kind code	A1
Filing date	Mar 23, 2017
Priority date	Mar 28, 2016
Publication date	Sep 24, 2020
Grant date	—

Abstract

There is provided a novel alkoxymagnesium which, when used as a constituent of a solid catalyst component for olefin polymerization to polymerize an olefin, may reduce the formation rate of a fine powder and may form a polymer having an excellent particle size distribution under high polymerization activity. The alkoxymagnesium is characterized by comprising secondary particles each of which is an aggregate of primary particles having an average particle diameter of less than 1 μm and by having a ratio represented by the average particle diameter of the primary particles/the average particle diameter of the secondary particles of 0.1 or less, a total pore volume of 0.5 to 1 cm3/g, a specific surface area of less than 50 m2/g, and a particle size distribution index (SPAN) 1 or less.

First claim

1 . An alkoxymagnesium comprising secondary particles each of which is an aggregate of primary particles having an average particle diameter of less than 1 μm, wherein
a ratio of an average particle diameter of the primary particles/an average particle diameter of the secondary particles is 0.1 or less, a total pore volume is 0.5 to 1 cm 3 /g, a specific surface area is less 50 m 2 /g, and a particle size distribution index (SPAN) is 1 or less.

2 . The alkoxymagnesium according to claim 1 , wherein a content of a fine powder having a particle diameter of 5 μm or less is 3% by mass or less based on a total particle mass, the total pore volume is 0.5 to 1 cm 3 /g, and 50% or more of pores having a pore diameter of 1 μm or less has a pore diameter of 0.5 μm or less.

3 . The alkoxymagnesium according to claim 1 , wherein the average particle diameter of the secondary particles is less than 60 μm.

4 . A method for producing an alkoxymagnesium, comprising sequentially carrying out
a solid formation step of reacting metal magnesium with an alcohol in the presence of a catalyst to form a solid, and a contact step of contacting the solid with one or more carboxylic acid esters in an organic solvent to form a suspension.

5 . The method for producing an alkoxymagnesium according to claim 4 , wherein the alcohol is one or more selected from methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, and 2-ethylhexyl alcohol.

6 . The method for producing an alkoxymagnesium according to claim 4 , wherein the organic solvent is one or more selected from aliphatic hydrocarbon compounds and aromatic hydrocarbon compounds.

7 . The method for producing an alkoxymagnesium according to claim 4 , wherein the carboxylic acid ester is one or more selected from compounds represented by the following general formula (I);

wherein R 1 and R 2 each are a hydrogen atom, a straight-chain alkyl group having 1 to 12 carbon atoms, a branched-chain alkyl group having 3 to 12 carbon atoms, a vinyl group, a straight-chain alkenyl group having 3 to 12 carbon atoms, a branched-chain alkenyl group having 3 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms, R 1 and R 2 may be identical or different from each other or R 1 and R 2 may bond with each other to form a ring, and R 3 and R 4 each are an alkyl group having 1 to 12 carbon atoms and may be identical or different from each other, compounds represented by the following general formula (II);

wherein R 5 to R 8 each represent a hydrogen atom, a straight-chain alkyl group having 1 to 12 carbon atoms, a branched-chain alkyl group having 3 to 12 carbon atoms, a vinyl group, a straight-chain alkenyl group having 3 to 12 carbon atoms, a branched-chain alkenyl group having 3 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms, R 5 to R 8 may be identical or different from one another, and R 5 and R 6 , and R 7 and R 8 may bond with each other to form a ring, and R 9 and R 10 each are an alkyl group having 1 to 12 carbon atoms and may be identical or different from each other, and compounds represented by the following general formula (III);

wherein R 11 and R 12 each represent a hydrogen atom, a straight-chain alkyl group having 1 to 12 carbon atoms, a branched-chain alkyl group having 3 to 12 carbon atoms, a vinyl group, a straight-chain alkenyl group having 3 to 12 carbon atoms, a branched-chain alkenyl group having 3 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms, R 11 and R 12 may be identical or different from each other or R 11 and R 12 may bond with each other to form a ring, and R 13 and R 14 each are an alkyl group having 1 to 12 carbon atoms and may be identical or different.

8 . The method for producing an alkoxymagnesium according to claim 4 , wherein the carboxylic acid ester is one or more selected from diethyl succinate, dibutyl succinate, bis(2-ethylhexyl) succinate, diethyl maleate, dibutyl maleate, bis(2-ethylhexyl) maleate, diethyl malonate, dibutyl malonate, and bis(2-ethylhexyl) malonate.

9 . The method for producing an alkoxymagnesium according to claim 4 , wherein the alkoxymagnesium is diethoxymagnesium.

10 . The method for producing an alkoxymagnesium according to claim 4 , wherein, by carrying out the contact step,
a portion of the solid is reacted with the carboxylic acid ester to form a reactant, a portion of the solid is dissolved in a mixture of the carboxylic acid ester and the organic solvent, or a portion of the solid is liberated in a mixture of the carboxylic acid ester and the organic solvent.

11 . A solid catalyst component for olefin polymerization obtained by contacting (a) the alkoxymagnesium according to claim 1 , (b) a titanium halogen compound, and (c) an electron-donating compound with one another.

12 . An olefin polymerization catalyst comprising (A) the solid catalyst component for olefin polymerization according to claim 11 , (B) an organoaluminum compound represented by the following general formula (IV);
R 15 p AlQ 3-p   (IV)
wherein R 15 represents an alkyl group having 1 to 4 carbon atoms, Q represents a hydrogen atom or halogen atom, and p is a real number satisfying 0<p≤3, provided that, when a plurality of R 15 are present, each R 15 may be identical or different from one another and when a plurality of Q are present, each Q may be identical or different from one another, and (C) an external electron-donating compound.

13 . The olefin polymerization catalyst according to claim 12 , wherein
(C) the external electron-donating compound is one or more selected from organosilicon compounds represented by the following general formula (V);
R 16 q Si(OR 17 ) 4-q   (V)

wherein R 16 represents an alkyl group having 1 to 12 carbon atoms, a vinyl group, an alkenyl group having 3 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, a cycloalkenyl group having 3 to 12 carbon atoms, an aromatic hydrocarbon group having 6 to 15 carbon atoms, or an aromatic hydrocarbon group having 6 to 15 carbon atoms and having a substituent, provided that, when a plurality of R 16 are present, the plurality of R 16 may be identical or different from one another, R 17 represents an alkyl group having 1 to 4 carbon atoms, a vinyl group, an alkenyl group having 3 to 12 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, an aromatic hydrocarbon group having 6 to 12 carbon atoms, or an aromatic hydrocarbon group having 7 to 12 carbon atoms and having a substituent, provided that, when a plurality of R 17 are present, the plurality of R 17 may be identical or different from one another, and q is an integer of 0≤q≤3, and
aminosilane compounds represented by the general formula (VI);
(R 18 R 19 N) s SiR 20 4-s   (VI)

wherein R 18 and R 19 each represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a vinyl group, an alkenyl group having 3 to 20 carbon atoms, cycloalkyl group having 3 to 20 carbon atoms, a cycloalkenyl group having 3 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms, R 18 and R 19 may be identical or different from each other or

Assignees

• Toho Titanium Co Ltd

Inventors

• Kono Hiroyuki
• Yamada Shingo
• Uozumi Toshiya

Classifications

• C08F4/6425

  containing magnesium · CPC title

• C07C31/30

  Alkali metal or alkaline earth metal alcoholates · CPC title

• C07C29/70 Primary

  by converting hydroxy groups to O-metal groups {(C07C29/09 takes precedence)} · CPC title

• C08F10/06 Primary

  Propene · CPC title

• C07F3/02

  Magnesium compounds · CPC title