Block polymers

Patent metadata

Field	Value
Publication number	US-11261281-B2
Application number	US-201816652348-A
Country	US
Kind code	B2
Filing date	Oct 11, 2018
Priority date	Oct 19, 2017
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A block polymer comprising a first block and a second block is provided. The first block contains aromatic α-mono-olefin units, and the second block contains both 1,3-diene units and mono-olefin units.

First claim

The invention claimed is:

1. A block polymer comprising:
a first block and a second block,
the first block comprising monomer units of a first aromatic α-mono-olefin, the first aromatic α-mono-olefin being of formula CH 2 ═CH—Ar, Ar representing a substituted or unsubstituted aromatic group,
the second block comprising monomer units of a second 1,3-diene and monomer units of a second olefin selected from the group consisting of ethylene, α-mono-olefins and their mixtures,
provided that, if the second block is a copolymer chain of a 1,3-diene and of an aromatic α-mono-olefin of formula CH 2 ═CH—Ar′, Ar′ representing a substituted or unsubstituted aromatic group, the diene units of trans-1,4-structure in the second block represent more than 80 mol % of the diene units of 1,4-structure of the second block, and
the block polymer containing 1,2-cyclohexanediyl units.

2. The block polymer according to claim 1 , in which the Ar group and the Ar′ group are, independently of one another, a phenyl group or an aryl group.

3. The block polymer according to claim 1 , which block polymer is a diblock.

4. The block polymer polymer according to claim 1 , in which the first aromatic α-mono-olefin is styrene.

5. The block polymer polymer according to claim 1 , in which the first block comprises more than 0 mol % to 100 mol % of units of the first aromatic α-mono-olefin and from 0 mol % to less than 100 mol % of units of a first 1,3-diene.

6. The block polymer according to claim 5 , in which the first 1,3-diene is 1,3-butadiene, isoprene or their mixture.

7. The block polymer according to claim 1 , in which the first block is a homopolymer chain of the first aromatic α-mono-olefin.

8. The block polymer according to claim 5 , in which the first block is a copolymer chain of the first aromatic α-mono-olefin and of the first 1,3-diene.

9. The block polymer according to claim 1 , in which the first block contains more than 10 monomer units.

10. The block polymer according to claim 1 , in which the first block is an atactic chain.

11. The block polymer according to claim 1 , in which the second block comprises more than 0 mol % to 50 mol % of the monomer units of the second 1,3-diene and from 50 mol % to less than 100 mol % of the monomer units of the second olefin.

12. The block polymer according to claim 1 , in which the diene units of trans-1,4-structure in the second block represent more than 80 mol % of the diene units of 1,4-structure of the second block.

13. The block polymer according to claim 1 , in which the diene units of trans-1,4-structure in the block polymer represent more than 70 mol % of the diene units of 1,4-structure of the block polymer.

14. The block polymer according to claim 1 , in which the second 1,3-diene is 1,3-butadiene.

15. The block polymer according to claim 1 , in which the second block is a copolymer chain of 1,3-butadiene and of ethylene or a terpolymer chain of 1,3-butadiene, of ethylene and of an α-mono-olefin.

16. The block polymer according to claim 1 , in which the first block is covalently bonded to the second block by direct joining of a carbon atom of a monomer unit of the first block to a carbon atom of a monomer unit of the second block.

17. The block polymer according to claim 1 , in which the first block includes an atactic polystyrene, and the second block includes a copolymer of 1,3-butadiene and of ethylene (EB).

Assignees

• Michelin & Cie

Inventors

• Jean-Baptiste-Dit-Dominique François
• Lafaquiere Vincent

Classifications

• C08F297/06

  using a catalyst of the coordination type · CPC title

• C08F4/52

  selected from boron, aluminium, gallium, indium, thallium or rare earths (C08F4/14 takes precedence) · CPC title

• C08F295/00 Primary

  Macromolecular compounds obtained by polymerisation using successively different catalyst types without deactivating the intermediate polymer · CPC title

• C08F236/06

  Butadiene · CPC title

• C08F293/005 Primary

  using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent · CPC title