Multicomponent copolymer, rubber composition, and tire

Patent metadata

Field	Value
Publication number	US-10030092-B2
Application number	US-201515317548-A
Country	US
Kind code	B2
Filing date	Jun 3, 2015
Priority date	Jun 12, 2014
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

Provided is a polymer that contributes to the improvement of the durability and weather resistance of rubber compositions or rubber products such as a tire, and has low crystallinity. Disclosed is a multicomponent copolymer comprising a conjugated diene unit, a non-conjugated olefin unit, and an aromatic vinyl unit, wherein the multicomponent copolymer has a main chain consisting only of an acyclic structure, and the content of cis-1,4 bonds in the entire conjugated diene unit is 50% or more.

First claim

The invention claimed is:

1. A multicomponent copolymer comprising a conjugated diene unit, a non-conjugated olefin unit, and an aromatic vinyl unit, wherein the multicomponent copolymer has a main chain consisting only of an acyclic structure, the content of cis-1,4 bonds in the entire conjugated diene unit is 50% or more, the content of the conjugated diene unit is 1 to 99 mol %, the total content of the non-conjugated olefin unit and the aromatic vinyl unit is 1 to 99 mol %, and a mole ratio represented by the non-conjugated olefin unit:the aromatic vinyl unit is 13.2:86.8 to 98.3:1.7.

2. The multicomponent copolymer according to claim 1 , wherein the non-conjugated olefin unit is an acyclic non-conjugated olefin unit.

3. The multicomponent copolymer according to claim 2 , wherein the acyclic non-conjugated olefin unit consists only of an ethylene unit.

4. The multicomponent copolymer according to claim 1 , wherein the highest melting point (T m ) is 100° C. or lower, or the melting point (T m ) has disappeared.

5. The multicomponent copolymer according to claim 1 , wherein the aromatic vinyl unit comprises a styrene unit.

6. The multicomponent copolymer according to claim 1 , wherein the conjugated diene unit comprises a 1,3-butadiene unit and/or an isoprene unit.

7. The multicomponent copolymer according to claim 1 , wherein the conjugated diene unit consists only of a 1,3-butadiene unit.

8. The multicomponent copolymer according to claim 1 , which is a terpolymer consisting only of a 1,3-butadiene unit, an ethylene unit, and a styrene unit.

9. A rubber composition comprising the multicomponent copolymer according to claim 1 .

10. A tire, wherein the rubber composition according to claim 9 is used.

11. A multicomponent copolymer comprising a conjugated diene unit, a non-conjugated olefin unit, and an aromatic vinyl unit, wherein the multicomponent copolymer has a main chain consisting only of an acyclic structure, the content of cis-1,4 bonds in the entire conjugated diene unit is 50% or more, the content of the conjugated diene unit is 1 to 52.1 mol % and the total content of the non-conjugated olefin unit and the aromatic vinyl unit is 47.9 to 99 mol %.

12. The multicomponent copolymer according to claim 11 , wherein the non-conjugated olefin unit is an acyclic non-conjugated olefin unit.

13. The multicomponent copolymer according to claim 12 , wherein the acyclic non-conjugated olefin unit consists only of an ethylene unit.

14. The multicomponent copolymer according to claim 11 , wherein the highest melting point (T m ) is 100° C. or lower, or the melting point (T m ) has disappeared.

15. The multicomponent copolymer according to claim 11 , wherein the aromatic vinyl unit comprises a styrene unit.

16. The multicomponent copolymer according to claim 11 , wherein the conjugated diene unit comprises a 1,3-butadiene unit and/or an isoprene unit.

17. The multicomponent copolymer according to claim 11 , which is a terpolymer consisting only of a 1,3-butadiene unit, an ethylene unit, and a styrene unit.

18. A rubber composition comprising the multicomponent copolymer according to claim 11 .

19. A tire, wherein the rubber composition according to claim 18 is used.

Assignees

• Bridgestone Corp

Inventors

• Oishi Shigeki

Classifications

• C08F210/02

  Ethene · CPC title

• C08F236/10 Primary

  with vinyl-aromatic monomers · CPC title

• C08L9/06

  Copolymers with styrene · CPC title

• B60C1/00 Primary

  Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title

• B60C1/0016

  Compositions of the tread · CPC title