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

Patent metadata

Field	Value
Publication number	US-10875952-B2
Application number	US-201615766571-A
Country	US
Kind code	B2
Filing date	Oct 14, 2016
Priority date	Oct 16, 2015
Publication date	Dec 29, 2020
Grant date	Dec 29, 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 having high abrasion resistance and wet performance. Further, the invention is to provide a rubber composition containing the multicomponent copolymer, a crosslinked rubber composition produced by crosslinking the rubber composition, and a tire and a rubber product using the rubber composition or the crosslinked rubber composition. The multicomponent copolymer of the invention contains a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, wherein the content of the aromatic vinyl unit is 5 mol % or more and less than 50 mol % of the whole multicomponent copolymer and the content of the non-conjugated olefin unit is more than 0 mol % and 50 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 content of the aromatic vinyl unit is 5 mol % or more and less than 50 mol % of the whole multicomponent copolymer,
the content of the non-conjugated olefin unit is more than 0 mol % and 50 mol % or less of the whole multicomponent copolymer,
a highest melting point of the multicomponent copolymer is 45° C. or higher, and
a polystyrene-equivalent weight-average molecular weight of the multicomponent copolymer is 100,000 to 9,000,000.

2. The multicomponent copolymer according to claim 1 , the highest melting point of the multicomponent copolymer is 100° C. or higher.

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

4. The multicomponent copolymer according to claim 1 , wherein the content of the non-conjugated olefin unit is 30 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 5 mol % or more of the whole multicomponent copolymer.

6. The multicomponent copolymer according to claim 1 , wherein the content of the conjugated diene unit is 50 mol % or less of the whole multicomponent copolymer.

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

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

9. 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.

10. 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.

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

12. A crosslinked rubber composition produced by crosslinking the rubber composition of claim 11 .

13. A rubber product comprising the rubber composition of claim 11 .

14. A tire comprising the rubber composition of claim 11 .

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

16. A tire comprising the crosslinked rubber composition of claim 12 .

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

18. The multicomponent copolymer according to claim 2 , wherein the content of the non-conjugated olefin unit is 30 mol % or more of the whole multicomponent copolymer.

19. The multicomponent copolymer according to claim 2 , wherein the content of the conjugated diene unit is 5 mol % or more of the whole multicomponent copolymer.

Assignees

• Bridgestone Corp

Inventors

• Kotani Kyohei
• Takano Shigenaga
• Oishi Shigeki
• Kaita Shojiro

Classifications

• C08F295/00 Primary

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

• C08L47/00

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Compositions of derivatives of such polymers (C08L45/00 takes precedence; of conjugated diene rubbers C08L9/00 - C08L21/00) · CPC title