Multi-component copolymer, rubber composition, crosslinked rubber composition and rubber article

Patent metadata

Field	Value
Publication number	US-11098146-B2
Application number	US-201615766720-A
Country	US
Kind code	B2
Filing date	Oct 11, 2016
Priority date	Oct 16, 2015
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

Provided is a multi-component copolymer capable of improving the rollability of a rubber composition while having excellent low heat generating property. The multi-component copolymer comprises conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a ratio among all of the aromatic vinyl units of at least one aromatic vinyl unit existing in amorphous parts inclusive of the conjugated diene units is less than 50%.

First claim

The invention claimed is:

1. A multi-component copolymer comprising conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein:
the multi-component copolymer is a terpolymer consisting exclusively of 1,3-butadiene units as the conjugated diene units, ethylene units as the non-conjugated olefin units, and styrene units as the aromatic vinyl units,
a ratio among all of the aromatic vinyl units of at least one aromatic vinyl unit existing in amorphous parts inclusive of the conjugated diene units is less than 50%, the ratio being obtained by using a ratio (A) of the non-conjugated olefin units and the aromatic vinyl units in the multi-component copolymer, which is obtained from an integration ratio of the 1 H-NMR spectrum, and a ratio (B) of the non-conjugated olefin units and the aromatic vinyl units in a component exclusive of the diene parts which is obtained after ozonolyzing the diene parts contained in the multicomponent copolymer, which is obtained from an integration ratio of the 1 H-NMR spectrum, and
the multi-component copolymer has a polystyrene equivalent weight-average molecular weight (Mw) of 100,000 to 9,000,000.

2. The multi-component copolymer according to claim 1 , wherein:
a cis-1,4 bond content among all of the conjugated diene units is 50% or more.

3. The multi-component copolymer according to claim 1 , wherein:
a content of the aromatic vinyl units is 2 mol % or more.

4. The multi-component copolymer according to claim 1 , wherein:
the content of the aromatic vinyl units is 30 mol % or less.

5. The multi-component copolymer according to claim 1 , wherein:
a content of the conjugated diene units is 15 mol % or more.

6. The multi-component copolymer according to claim 1 , wherein:
the content of the conjugated diene units is 60 mol % or less.

7. The multi-component copolymer according to claim 1 , wherein:
a content of the non-conjugated olefin units is 25 mol % or more.

8. The multi-component copolymer according to claim 1 , wherein:
the content of the non-conjugated olefin units is 80 mol % or less.

9. The multi-component copolymer according to claim 1 , wherein:
the aromatic vinyl units comprise styrene units.

10. The multi-component copolymer according to claim 1 , wherein:
the conjugated diene units comprise 1,3-butadiene units and/or isoprene units.

11. A rubber composition comprising the multi-component copolymer according to claim 1 .

12. A crosslinked rubber composition being a crosslinked product of the rubber composition according to claim 11 .

13. A rubber article comprising the crosslinked rubber composition according to claim 12 .

14. The rubber article according to claim 13 , being a tire.

15. The multi-component copolymer according to claim 2 , wherein:
a content of the aromatic vinyl units is 2 mol % or more.

16. The multi-component copolymer according to claim 2 , wherein:
the content of the aromatic vinyl units is 30 mol % or less.

17. The multi-component copolymer according to claim 2 , wherein:
a content of the conjugated diene units is 15 mol % or more.

18. The multi-component copolymer according to claim 1 , having a molecular weight distribution (Mw/Mn) represented by the ratio of the polystyrene equivalent weight-average molecular weight (Mw) to a polystyrene equivalent number-average molecular weight (Mn) of 3.31 or more and 10.0 or less.

Assignees

• Bridgestone Corp

Inventors

• Kimura Madoka
• Tanabe Tomoe
• Oishi Shigeki

Classifications

• C08K3/04 Primary

  Carbon · 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