Solid catalyst component for polymerization of olefin, catalyst for polymerization of olefin, method for producing polymer of olefin, polymer of olefin, method for producing propylene-based block copolymer, and propylene-based block copolymer

Patent metadata

Field	Value
Publication number	US-2024218087-A1
Application number	US-202218288916-A
Country	US
Kind code	A1
Filing date	May 24, 2022
Priority date	May 26, 2021
Publication date	Jul 4, 2024
Grant date	—

Abstract

To provide a solid catalyst component for polymerization of an olefin, which can easily produce a polymer of an olefin, which is excellent in fluidity and also is high in rigidity even though the molecular weight distribution is narrow, without performing complicated polymerization treatment. A solid catalyst component for polymerization of an olefin includes magnesium, titanium and halogen, and further includes an aromatic carboxylic acid ester and a 1,3-diether compound as internal electron-donating compounds, wherein a content ratio of the titanium is 0.5 to 2.0% by mass, a content ratio of the aromatic carboxylic acid ester in a total content of the internal electron-donating compounds is 40 to 60 mol %, and a content ratio of the 1,3-diether compound in the total content of the internal electron-donating compounds is 40 to 60 mol %.

First claim

1 . A solid catalyst component for polymerization of an olefin, comprising magnesium, titanium and halogen, and further comprising an aromatic carboxylic acid ester and a 1,3-diether compound as internal electron-donating compounds, wherein a content ratio of the titanium is 0.5 to 2.0% by mass, a content ratio of the aromatic carboxylic acid ester in a total content of the internal electron-donating compounds is 40 to 60 mol %, and a content ratio of the 1,3-diether compound in the total content of the internal electron-donating compounds is 40 to 60 mol %.

2 . The solid catalyst component for polymerization of an olefin according to claim 1 , comprising the titanium, the aromatic carboxylic acid ester and the 1,3-diether compound so that a ratio represented by a total content of the aromatic carboxylic acid ester and the 1,3-diether compound/a content of the titanium is 2.0 or larger in terms of a mass ratio.

3 . The solid catalyst component for polymerization of an olefin according to claim 1 , comprising the titanium and the aromatic carboxylic acid ester so that a ratio represented by a content of the aromatic carboxylic acid ester/a content of the titanium is 1.5 or larger in terms of a mass ratio.

4 . The solid catalyst component for polymerization of an olefin according to claim 1 , comprising the titanium and the 1,3-diether compound so that a ratio represented by a content of the 1,3-diether compound/a content of the titanium is 1.5 or larger in terms of a mass ratio.

5 . A catalyst for polymerization of an olefin, comprising: the solid catalyst component for polymerization of an olefin according to claim 1 ; and one or more organoaluminum compounds selected from the group consisting of compounds represented by the following general formula (I):

wherein R 1 represents an alkyl group having 1 to 6 carbon atoms, Q represents a hydrogen atom or a halogen atom, and p represents a real number of 0<p≤3.

6 . The catalyst for polymerization of an olefin according to claim 5 , further comprising an organosilicon compound.

7 . A method for producing a polymer of an olefin, comprising polymerizing an olefin using the catalyst for polymerization of an olefin according to claim 5 .

8 . The method for producing a polymer of an olefin according to claim 7 , wherein the polymerization of the olefin is homopolymerization of propylene, or copolymerization of propylene and an cx-olefin other than propylene.

9 . A polymer of an olefin, having:
a melt flow rate (MFR) of 20 g/10 minutes or higher; a molecular weight distribution (Mw/Mn) that is a ratio of a weight average molecular weight (Mw) to a number average molecular weight (Mn) of 4.0 to 7.0, and a molecular weight distribution (Mz/Mw) that is a ratio of a Z-average molecular weight (Mz) to the weight average molecular weight (Mw) of 2.0 to 7.0; and a flexural modulus (FM) of 1800 MPa or higher.

10 . A method for producing a propylene-based block copolymer, comprising:
polymerizing an olefin containing 95 to 100% by mass of propylene using the catalyst for polymerization of an olefin according to claim 5 to obtain a propylene-based polymer having a melt flow rate (MFR) of 20 g/10 minutes or higher, a molecular weight distribution (Mw/Mn) that is a ratio of a weight average molecular weight (Mw) to a number average molecular weight (Mn) of 4.0 to 7.0, a molecular weight distribution (Mz/Mw) that is a ratio of a Z-average molecular weight (Mz) to the weight average molecular weight (Mw) of 2.0 to 7.0, and a flexural modulus (FM) of 1800 MPa or higher; and then polymerizing propylene and an α-olefin other than propylene, in the presence of the obtained propylene-based polymer.

11 . A propylene-based block copolymer obtained by
polymerizing an olefin containing 95 to 100% by mass of propylene using the catalyst for polymerization of an olefin according to claim 5 to obtain a propylene-based polymer having a melt flow rate (MFR) of 20 g/10 minutes or higher, a molecular weight distribution (Mw/Mn) that is a ratio of a weight average molecular weight (Mw) to a number average molecular weight (Mn) of 4.0 to 7.0, a molecular weight distribution (Mz/Mw) that is a ratio of a Z-average molecular weight (Mz) to the weight average molecular weight (Mw) of 2.0 to 7.0, and a flexural modulus (FM) of 1800 MPa or higher, and then polymerizing propylene and an α-olefin other than propylene, in the presence of the obtained propylene-based polymer.

Assignees

• Toho Titanium Co Ltd

Inventors

• Funabashi Hideo
• Tashino Kunihiko
• Ogawa Hayashi
• Soga Hirokazu

Classifications

• C08F297/08

  polymerising mono-olefins · CPC title

• C08F2810/30

  leading to the formation or introduction of aliphatic or alicyclic unsaturated groups · CPC title

• C08F297/083

  the monomers being ethylene or propylene · CPC title

• C08F110/06

  Propene · CPC title

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title