Multicomponent copolymer, rubber composition, cross-linked rubber composition, rubber product, and tire

Patent metadata

Field	Value
Publication number	US-11021595-B2
Application number	US-201615766580-A
Country	US
Kind code	B2
Filing date	Oct 14, 2016
Priority date	Oct 16, 2015
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

An object of the present invention is to provide a multicomponent copolymer for use for producing a crosslinked rubber composition and a rubber product excellent in fracture performance (strength and elongation) at high temperatures while maintaining high weather resistance. Further, the invention provides 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 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, the content of the aromatic vinyl unit is 3 mol % or more of the whole multicomponent copolymer, and the content of the non-conjugated olefin unit is more than 44 mol % and less than 97 mol % 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,
the content of the aromatic vinyl unit is 3 mol % or more of the whole multicomponent copolymer
the content of the non-conjugated olefin unit is more than 44 mol % and less than 97 mol % of the whole multicomponent copolymer, 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 , wherein the content of the aromatic vinyl unit is 30 mol % or less of the whole multicomponent copolymer.

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

4. The multicomponent copolymer according to claim 1 , wherein the content of the conjugated diene unit is 40 mol % or less of the whole multicomponent copolymer.

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

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

7. 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.

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

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

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

11. A crosslinked rubber composition produced by crosslinking the rubber composition of claim 10 .

12. A rubber product using the rubber composition of claim 10 .

13. A tire using the rubber composition of claim 10 .

14. A rubber product using the crosslinked rubber composition of claim 11 .

15. A tire using the crosslinked rubber composition of claim 11 .

16. The multicomponent copolymer according to claim 2 , wherein the content of the conjugated diene unit is 1 mol % or more of the whole multicomponent copolymer.

17. The multicomponent copolymer according to claim 2 , wherein the content of the conjugated diene unit is 40 mol % or less of the whole multicomponent copolymer.

18. The multicomponent copolymer according to claim 2 , wherein the non-conjugated olefin unit is an ethylene unit alone.

19. The multicomponent copolymer according to claim 2 , wherein the aromatic vinyl unit contains a styrene unit.

20. The multicomponent copolymer according to claim 2 , wherein the conjugated diene unit contains at least one selected from the group consisting of a 1,3-butadiene unit and an isoprene unit.

Assignees

• Bridgestone Corp

Inventors

• Horikawa Yasuo
• Tardif Olivier
• Ono Yamato

Classifications

• C08L9/00 Primary

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C08F212/06

  Hydrocarbons · 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

• C08L53/02

  of vinyl-aromatic monomers and conjugated dienes · CPC title