Ethylene-rich diene block polymer having a random block and a polyethylene block

Patent metadata

Field	Value
Publication number	US-12428515-B2
Application number	US-202017632315-A
Country	US
Kind code	B2
Filing date	Jul 27, 2020
Priority date	Aug 7, 2019
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

A diblock polymer composed of a first block and a second block is provided. The first block is a statistical copolymer comprising units of a 1,3-diene and more than 50 mol % of ethylene units. The second block is a polyethylene with a melting point above 90° C. and a number-average molar mass greater than or equal to 2000 g/mol and less than or equal to 10 000 g/mol. Such a diblock polymer has improved rheology compared to a statistical copolymer of the same microstructure and of the same macrostructure as the first block of the diblock polymer.

First claim

The invention claimed is:

1. A diblock polymer composed of a first block and a second block, the first block being a statistical copolymer comprising units of a 1,3-diene and more than 50 mol % of ethylene units, the second block being a polyethylene with a melting point above 90° C. and a number-average molar mass greater than or equal to 2000 g/mol and less than or equal to 10 000 g/mol, wherein the 1,3-diene is 1,3-butadiene or a mixture of 1,3-dienes, one of which is 1,3-butadiene, and the first block contains 1,2-cyclohexanediyl units or 1,4-cyclohexanediyl units.

2. A diblock polymer according to claim 1 , wherein the first block is a statistical copolymer of ethylene and a 1,3-diene.

3. A diblock polymer according to claim 1 , wherein the first block contains more than 60 mol % of ethylene units.

4. A diblock polymer according to claim 1 , wherein the first block contains at most 90 mol % of ethylene units.

5. A diblock polymer according to claim 1 , wherein the first block contains at most 85 mol % of ethylene units.

6. A diblock polymer according to claim 1 , wherein the first block has a glass transition temperature between −90° C. and −20° C.

7. A diblock polymer according to claim 1 , wherein the first block has a number-average molar mass of greater than or equal to 3000 g/mol and less than or equal to 80 000 g/mol.

8. A diblock polymer according to claim 1 , wherein the first block contains units of the 1,3-diene in a 1,4 configuration.

9. A diblock polymer according to claim 1 , wherein the second block is a linear polyethylene.

10. A composition which comprises a diblock polymer according to claim 1 and another component.

11. A diblock polymer composed of a first block and a second block, the first block being a statistical copolymer comprising units of a 1,3-diene and more than 50 mol % of ethylene units, the second block being a polyethylene with a melting point above 90° C. and a number-average molar mass greater than or equal to 2000 g/mol and less than or equal to 10 000 g/mol, wherein the units of the 1,3-diene in a 1,2 configuration and the units of the 1,3-diene in a 3,4 configuration represent more than 50 mol % of the units of the 1,3-diene.

12. A diblock polymer according to claim 11 in which the 1,3-diene is 1,3-butadiene.

13. A process for preparing a diblock polymer, the diblock polymer composed of a first block and a second block, the first block being a statistical copolymer comprising units of a 1,3-diene and more than 50 mol % of ethylene units, the second block being a polyethylene with a melting point above 90° C. and a number-average molar mass greater than or equal to 2000 g/mol and less than or equal to 10 000 g/mol, and the process including a statistical copolymerization of a monomer mixture containing ethylene and a 1,3-diene, then the subsequent polymerization of ethylene, wherein a catalytic system based at least on a metallocene of formula (I) and an organomagnesium compound is used
P(Cp 1 Cp 2 )Nd(BH 4 ) (1+y) —Li y (THF) x

Cp 1 and Cp 2 , which are identical or different, being selected from the group consisting of cyclopentadienyl groups and fluorenyl groups, the groups being substituted or unsubstituted,
P being a group bridging the two Cp 1 and Cp 2 groups and representing a ZR 1 R 2 group, Z representing a silicon or carbon atom, R 1 and R 2 , which are identical or different, each representing an alkyl group comprising from 1 to 20 carbon atoms,
y, which is an integer, being equal to or greater than 0, and
x being equal to or greater than 0.

Assignees

• Michelin & Cie
• Centre Nat Rech Scient
• Ecole Superieure De Chimie Physique Electronique Lyon
• Univ Claude Bernard Lyon
• Cie General Des Etablissments Michelin
• Univ Claude Bernad Lyon 1

Inventors

• Moreso Emma
• Thuilliez Julien
• Jean-Baptiste-Dit-Dominique François
• Boisson Christophe
• D'Agosto Franck
• Baulu Nicolas
• Montarnal Damien

Classifications

• C08F2420/03

  Cp or analog not bridged to a non-Cp X ancillary neutral donor · CPC title

• C08F210/02

  Ethene · CPC title

• C08F297/08 Primary

  polymerising mono-olefins · CPC title

• C08F297/06 Primary

  using a catalyst of the coordination type · CPC title

• C08F297/083 Primary

  the monomers being ethylene or propylene · CPC title