CATALYST FOR POLYMERIZATION OF AN OLEFIN, METHOD FOR PRODUCING POLYMER OF OLEFIN AND PROPYLENE-alpha-OLEFIN COPOLYMER

Patent metadata

Field	Value
Publication number	US-2020140577-A1
Application number	US-201816611673-A
Country	US
Kind code	A1
Filing date	Apr 26, 2018
Priority date	May 10, 2017
Publication date	May 7, 2020
Grant date	—

Abstract

A catalyst for polymerization of an olefin is disclosed, including a compound represented by the general formula R1R2Si(NHR3)2 wherein R1 is a cycloalkyl group having 3 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms; R2 is a linear alkyl group having 1 to 10 carbon atoms or a branched alkyl group having 3 to 10 carbon atoms; the number of carbon atoms of R1 is larger by 2 or more than that of R2; and R3 is a linear alkyl group having 2 to 6 carbon atoms, a branched alkyl group having 3 to 6 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms, as an external electron-donating compound. The catalyst can prepare a polymer having excellent hydrogen activity and high stereoregularity and melt flow rate even in homopolymerization at a high temperature, with high productivity.

First claim

1 . A catalyst for polymerization of an olefin, comprising a compound represented by the following general formula (I):
R 1 R 2 Si(NHR 3 ) 2   (I)
wherein R 1 is a cycloalkyl group having 3 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms; R 2 is a linear alkyl group having 1 to 10 carbon atoms or a branched alkyl group having 3 to 10 carbon atoms; the number of carbon atoms of R 1 is larger by 2 or more than that of R 2 ; and R 3 is a linear alkyl group having 2 to 6 carbon atoms, a branched alkyl group having 3 to 6 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms,
as an external electron-donating compound.

2 . The catalyst for polymerization of an olefin according to claim 1 , further comprising: a solid catalyst component containing magnesium, titanium, halogen and an internal electron-donating compound; and an organoaluminum compound.

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

4 . A method for producing a polymer of an olefin, comprising polymerizing the olefin in the presence of the catalyst for polymerization of an olefin according to claim 2 .

5 . A propylene-α-olefin copolymer being a product of copolymerization reaction of propylene and α-olefin other than propylene in the presence of the catalyst for polymerization of an olefin according to claim 1 .

6 . A propylene-α-olefin copolymer being a product of copolymerization reaction of propylene and α-olefin other than propylene in the presence of the catalyst for polymerization of an olefin according to claim 2 .

Assignees

• Toho Titanium Co Ltd

Inventors

• Hosaka Motoki
• Sugano Toshihiko

Classifications

• C08F4/6465 Primary

  containing silicium · CPC title

• C08F210/06 Primary

  Propene · CPC title

• Y02P20/52

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

• C08F110/06

  Propene · CPC title

• C08F2410/06

  Catalyst characterized by its size · CPC title