Catalyst for polymerization of olefin, method for producing polymer of olefin, and propylene homopolymer

Patent metadata

Field	Value
Publication number	US-2025188200-A1
Application number	US-202318843825-A
Country	US
Kind code	A1
Filing date	Feb 27, 2023
Priority date	Mar 11, 2022
Publication date	Jun 12, 2025
Grant date	—

Abstract

Provided is a catalyst for polymerization of an olefin, capable of easily producing a propylene homopolymer with an excellent melt flow rate and moldability, as well as further excellent flexural modulus, despite containing a solid catalyst component for polymerization of an olefin comprising a compound other than phthalate esters as an internal electron-donating compound. A catalyst for polymerization of an olefin, comprising: a solid catalyst component for polymerization of an olefin, comprising magnesium, titanium, halogen, and a succinic acid diester compound, wherein a ratio (S/T), represented by a total content of an internal electron-donating compound with the succinic acid diester compound as a main component(S) to a content of the titanium (T), is 0.60 to 1.30 in a molar ratio, an organoaluminum compound, and one or more external electron-donating compounds selected from specific aminosilane compounds.

First claim

1 . A catalyst for polymerization of an olefin, comprising:
a solid catalyst component for polymerization of an olefin, comprising magnesium, titanium, halogen, and a succinic acid diester compound, wherein a ratio (S/T), represented by a total content of an internal electron-donating compound with the succinic acid diester compound as a main component(S) to a content of the titanium (T), is 0.60 to 1.30 in a molar ratio, an organoaluminum compound, and one or more external electron-donating compounds selected from aminosilane compounds represented by the following formula (I):
R 1 n Si(NR 2 R 3 ) 4-n   (I)

wherein R 1 is an alkyl group having 1 to 20 carbon atoms, a vinyl group, an alkenyl group having 3 to 12 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an vinyloxy group, an alkenyloxy group having 3 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, a cycloalkyloxy group having 3 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms or an aryloxy group having 6 to 20 carbon atoms, wherein when more than one R 1 are present, the more than one R 1 may be the same as or different from each other; R 2 and R 3 are a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a vinyl group, an alkenyl group having 3 to 20 carbon atoms, a 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, wherein R 2 and R 3 may be the same as or different from each other and may be bonded to each other to form a ring, and when more than one NR 2 R 3 groups are present, the more than one NR 2 R 3 groups may be the same as or different from each other; and n satisfies 1≤n≤3.

2 . The catalyst for polymerization of an olefin according to claim 1 , wherein the total content of the internal electron-donating compound with the succinic acid diester compound as the main component(S) in the solid catalyst component for polymerization of an olefin is 10.0% by mass or more.

3 . The catalyst for polymerization of an olefin according to claim 1 , wherein the content of the titanium (T) in the solid catalyst component for polymerization of an olefin is 1.0 to 6.0% by mass.

4 . The catalyst for polymerization of an olefin according to claim 1 , wherein the succinic acid diester compound is one or more compounds selected from compounds represented by the following formula (II):

wherein R 4 and R 5 , the same as or different from each other, are a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R 6 and R 7 , the same as or different from each other, are a straight chain alkyl group or a branched chain alkyl group having 2 to 4 carbon atoms.

5 . The catalyst for polymerization of an olefin according to claim 1 , wherein the organoaluminum compound is one or more compounds selected from compounds represented by the following formula (III):
R 8 p AlQ 3-p   (III)

wherein R 8 is an alkyl group having 1 to 6 carbon atoms, Q is a hydrogen atom or halogen, and p satisfies 0<p≤3, wherein when more than one R 8 are present, each R 8 may be the same as or different from each other, and when more than one Q are present, each Q may be the same as or different from each other.

6 . A method for producing a polymer of an olefin, comprising polymerizing an olefin using the catalyst for polymerization of an olefin according to claim 1 .

7 . A propylene homopolymer having:
(a) a melt flow rate of 300 g/10 min or less, (b) a flexural modulus of 1,900 MPa or more, and (c) a ratio of a complex viscosity η* at an angular frequency of 0.01 rad/see to a complex viscosity η* at an angular frequency of 100 rad/see is 5.5 or more.

Assignees

• Toho Titanium Co Ltd

Inventors

• Kawamoto Yuta
• Funabashi Hideo
• Kono Hiroyuki
• SAKEMI Takaharu
• Ogawa Hayashi
• Kurosaki Keiichi

Classifications

• C08F10/06 Primary

  Propene · CPC title

• C08F110/06

  Propene · CPC title

• C08F2500/30

  Flexural modulus; Elasticity modulus · CPC title

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title

• C08F4/6494 Primary

  containing oxygen · CPC title