Multi-component copolymer, rubber composition, crosslinked rubber composition, rubber product, and tire

Patent metadata

Field	Value
Publication number	US-10793658-B2
Application number	US-201615766543-A
Country	US
Kind code	B2
Filing date	Oct 14, 2016
Priority date	Oct 16, 2015
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

An object of the present invention is to provide a multicomponent copolymer for use for producing a rubber composition and a rubber product such as tires and the like excellent in crack resistance and further having low heat generation while maintaining high weather resistance. Further, the present invention is to provide a rubber composition containing the multicomponent copolymer, a crosslinked rubber composition obtained by crosslinking the rubber composition, and a rubber product and a tire using the rubber composition or the crosslinked rubber composition. The multicomponent copolymer of the present invention contains a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, wherein the main chain is formed of an acyclic structure alone and the content of the aromatic vinyl unit is 5 mol % or less of the whole multicomponent copolymer.

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 main chain is formed of an acyclic structure alone, and
the content of the aromatic vinyl unit is 0.1 mol % or more and 5 mol % or less of the whole multicomponent copolymer, and, wherein:
the multicomponent copolymer has at least one melting point and the highest melting point of the at least one melting point is 105° C. or higher.

2. The multicomponent copolymer according to claim 1 , wherein the cis-1,4-bond content in the whole conjugated diene unit is 50% or more.

3. The multicomponent copolymer according to claim 1 , wherein the content of the non-conjugated olefin unit is 50 mol % or less of the whole multicomponent copolymer.

4. The multicomponent copolymer according to claim 1 , wherein the content of the conjugated diene unit is 45 mol % or more of the whole multicomponent copolymer.

5. The multicomponent copolymer according to claim 1 , wherein the content of the conjugated diene unit is 80 mol % or less of the whole multicomponent copolymer.

6. The multicomponent copolymer according to claim 1 , wherein the non-conjugated olefin unit is an ethylene unit alone.

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

8. The multicomponent copolymer according to claim 1 , wherein the conjugated diene unit contains at least one selected from the group consisting of a 1,3-butadiene unit and an isoprene unit.

9. The multicomponent copolymer according to claim 1 , which is a tercopolymer composed of only a 1,3-butadiene unit, an ethylene unit and a styrene unit.

10. A rubber composition comprising the multicomponent copolymer of claim 1 .

11. A crosslinked rubber composition comprising crosslinking the rubber composition of claim 10 .

12. A rubber product comprising the crosslinked rubber composition of claim 11 .

13. A tire comprising the crosslinked rubber composition of claim 11 .

14. The multicomponent copolymer according to claim 2 , wherein the content of the non-conjugated olefin unit is 50 mol % or less of the whole multicomponent copolymer.

15. The multicomponent copolymer according to claim 2 , wherein the content of the conjugated diene unit is 45 mol % or more of the whole multicomponent copolymer.

16. The multicomponent copolymer according to claim 2 , wherein the content of the conjugated diene unit is 80 mol % or less of the whole multicomponent copolymer.

Assignees

• Bridgestone Corp

Inventors

• Kimura Madoka
• Yanagisawa Aya
• Oishi Shigeki
• Kaita Shojiro

Classifications

• C08F210/02

  Ethene · CPC title

• C08F212/06

  Hydrocarbons · CPC title

• C08F210/00

  Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond · CPC title

• C08L25/02

  Homopolymers or copolymers of hydrocarbons · CPC title

• C08K3/011

  Crosslinking or vulcanising agents, e.g. accelerators · CPC title