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

• US 10,550,216 B2
• Filed: 10/11/2016
• Issued: 02/04/2020
• Est. Priority Date: 10/16/2015
• Status: Active Grant

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Kimura, Madoka, Oishi, Shigeki, Tanabe, Tomoe
• Primary Examiner(s): Rabago, Roberto
• Application Number:
  US15/766,061
• Publication Number:
  US 20180282459A1
• Time in Patent Office: 1,211 Days
• CPC Class Codes: B60C 1/00 Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
• CPC Class Codes: B60C 1/0025 Compositions of the sidewalls
• CPC Class Codes: C08F 210/00 Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
• CPC Class Codes: C08F 210/16 Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
• CPC Class Codes: C08F 212/06 Hydrocarbons
• CPC Class Codes: C08F 236/10 with vinyl-aromatic monomers
• CPC Class Codes: C08F 2800/10 as molar percentages
• CPC Class Codes: C08F 2810/20 leading to a crosslinking, either explicitly or inherently
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: C08L 23/00 Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 25/02 Homopolymers or copolymers of hydrocarbons
• CPC Class Codes: C08L 47/00 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 Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: C08L 9/00 Compositions of homopolymers or copolymers of conjugated diene hydrocarbons

Abstract

Provided is a multi-component copolymer having excellent crack growth resistance and wear resistance. The multi-component copolymer comprises conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a peak top molecular weight of non-conjugated olefin parts linking only the non-conjugated olefin units is 500 or more and less than 40,000.

Claims

1. A multi-component copolymer comprising conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein:

the non-conjugated olefin units consist exclusively of ethylene units, and

a peak top molecular weight of non-conjugated olefin parts linking only the non-conjugated olefin units is 500 or more and less than 40,000.

2. The multi-component copolymer according to claim 1, wherein:

a degree of crystallinity of the non-conjugated olefin parts is 5% or more and 45% or less.

3. The multi-component copolymer according to claim 1, wherein:

a crystal fusion heat of the non-conjugated olefin parts is 3 J/g or more and 60 J/g or less.

4. The multi-component copolymer according to claim 1, having a melting point of 40°

C. or more and 130°

C. or less.

5. The multi-component copolymer according to claim 1, wherein:

the aromatic vinyl units comprise styrene units.

6. The multi-component copolymer according to claim 1, wherein:

the conjugated diene units comprise 1,3-butadiene units and/or isoprene units.

7. The multi-component copolymer according to claim 1, being a tricopolymer 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.

8. The multi-component copolymer according to claim 1, having a polystyrene equivalent weight-average molecular weight of 100,000 to 800,000.

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

10. The rubber composition according to claim 9, comprising 10 mass % or more of the multi-component copolymer in 100 mass % of a rubber component.

11. A crosslinked rubber composition being a crosslinked product of the rubber composition according to claim 9.

12. A rubber article comprising the crosslinked rubber composition according to claim 11.

13. The rubber article according to claim 12, being a tire.

14. The multi-component copolymer according to claim 2, wherein:

a crystal fusion heat of the non-conjugated olefin parts is 3 J/g or more and 60 J/g or less.

15. The multi-component copolymer according to claim 2, having a melting point of 40°

C. or more and 130°

C. or less.

16. The multi-component copolymer according to claim 2, wherein:

the aromatic vinyl units comprise styrene units.

17. The multi-component copolymer according to claim 2, wherein:

the conjugated diene units comprise 1,3-butadiene units and/or isoprene units.