Copolymer, rubber composition, crosslinked rubber composition and tire

Patent metadata

Field	Value
Publication number	US-9701776-B2
Application number	US-201213983189-A
Country	US
Kind code	B2
Filing date	Feb 3, 2012
Priority date	Feb 4, 2011
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

The present invention provides a random copolymer that is used for manufacturing a rubber having high fracture strength and excellent low loss properties (low heat generation properties) and that includes randomly arranged monomer units of a conjugated diene compound and of a non-conjugated olefin, a rubber composition containing the random copolymer, a cross-linked rubber composition obtained by crosslinking the rubber composition, and a tire manufactured by using the rubber composition or the cross-linked rubber composition. A copolymer of a conjugated diene compound and a non-conjugated olefin includes a random copolymer having randomly arranged monomer units of the conjugated diene compound and of the non-conjugated olefin, which random copolymer contains, by at least 5 mol %, alternate bonding units of the conjugated diene compound and the non-conjugated olefin in a unit derived from the non-conjugated olefin.

First claim

The invention claimed is:

1. A copolymer of a conjugated diene compound and a non-conjugated olefin, comprising a random copolymer including randomly arranged monomer units of the conjugated diene compound and of the non-conjugated olefin, wherein the random copolymer contains, by at least 5 mol %, alternate bonding units of the conjugated diene compound and the non-conjugated olefin in a unit derived from the non-conjugated olefin, and the copolymer is obtained by polymerizing a conjugated diene compound and a non-conjugated olefin in the presence of a polymerization catalyst composition containing a metallocene-based composite catalyst represented by the following formula (I):

where M 1 represents a lanthanoid element: Cp R each independently represents an unsubstituted or substituted indenyl group: R A to R B each independently represent a hydrocarbon group having 1 to 20 carbon atoms, the R A and R B being μ-coordinated with M 1 and Al; and R C and R D each independently represent a hydrocarbon group having 1 to 20 carbon atoms or a hydrogen atom,
wherein the content of the unit derived from the non-conjugated olefin is greater than 11 mol % and not more than 20 mol %, and
wherein the copolymer has a polystyrene-equivalent average-weight molecular weight of 50,000 to 600,000.

2. The copolymer according to claim 1 , wherein the content of 1,2 adduct units of the conjugated diene compound in a unit derived from the conjugated diene compound is 5% or less.

3. The copolymer according to claim 1 , comprising a copolymer having a molecular weight distribution (Mw/Mn) of 10 or less.

4. The copolymer according to claim 1 , wherein the non-conjugated olefin is an acyclic olefin.

5. The copolymer according to claim 4 , wherein the non-conjugated olefin is at least one selected from the group consisting of ethylene, propylene, and 1-butene.

6. The copolymer according to claim 5 , wherein the non-conjugated olefin is ethylene.

7. The copolymer according to claim 1 , wherein the non-conjugated olefin has 2 to 10 carbon atoms.

8. The copolymer according to claim 1 , wherein the conjugated diene compound is at least one selected from the group consisting of 1,3-butadiene and isoprene.

9. A rubber composition comprising a copolymer of a conjugated diene compound and a non-conjugated olefin, comprising a random copolymer including randomly arranged monomer units of the conjugated diene compound and of the non-conjugated olefin, wherein the random copolymer contains, by at least 5 mol %, alternate bonding units of the conjugated diene compound and the non-conjugated olefin in a unit derived from the non-conjugated olefin, and the copolymer is obtained by polymerizing a conjugated diene compound and a non-conjugated olefin in the presence of a polymerization catalyst composition containing a metallocene-based composite catalyst represented by the following formula (I):

where M 1 represents a lanthanoid element; Cp R each independently represents an unsubstituted or substituted indenyl group; R A to R B each independently represent a hydrocarbon group having 1 to 20 carbon atoms, the R A and R B being μ-coordinated with M 1 and Al; and R C and R D each independently represent a hydrocarbon group having 1 to 20 carbon atoms or a hydrogen atom, wherein the content of the unit derived from the non-conjugated olefin is greater than 11 mol % and not more than 20 mol %, and wherein the copolymer has a polystyrene-equivalent average-weight molecular weight of 50,000 to 600,000%.

10. The rubber composition according to claim 9 , comprising, with respect to 100 parts by mass of a rubber component containing the copolymer of a conjugated diene compound and a non-conjugated olefin, a reinforcing filler by 5 parts by mass to 200 parts by mass and a crosslinking agent by 0.1 parts by mass to 20 parts by mass.

11. A crosslinked rubber composition obtained by crosslinking the rubber composition according to claim 9 .

12. A tire manufactured by using the crosslinked rubber composition according to claim 11 .

13. A tire manufactured by using the rubber composition according to claim 9 .

Assignees

• Horikawa Yasuo
• Kaita Shojiro
• Tardif Olivier
• Matsushita Junko
• Bridgestone Corp

Inventors

• Horikawa Yasuo
• Kaita Shojiro
• Tardif Olivier
• Matsushita Junko

Classifications

• B60C1/00 Primary

  Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title

• C08K3/04

  Carbon · CPC title

• C08L7/00

  Compositions of natural rubber · CPC title

• C08F236/04

  conjugated · CPC title

• C08F4/545

  rare earths being present, e.g. triethylaluminium + neodymium octanoate · CPC title