Rubber composition and pneumatic tire using same

Patent metadata

Field	Value
Publication number	US-9963580-B2
Application number	US-201514819733-A
Country	US
Kind code	B2
Filing date	Aug 6, 2015
Priority date	Mar 19, 2012
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A rubber composition includes a sulfur-crosslinkable diene rubber, from 1 to 100 parts by mass of carbon black and/or from 5 to 150 parts by mass of an inorganic filler, from 0.5 to 30 parts by mass of a sulfur-containing compounding agent, and from 0.01 to 20 parts by mass of a phosphine borane compound based on 100 parts by mass of the sulfur-crosslinkable diene rubber. The rubber composition may be applied in at least one type selected from the group consisting of a capped tread, a side wall, a belt, an inner liner, a carcass, and a bead of a pneumatic tire.

First claim

What is claimed is:

1. A rubber composition comprising:
a sulfur-crosslinkable diene rubber, wherein said sulfur-crosslinkable diene rubber is a styrene-butadiene copolymer rubber;
from 3 to 90 parts by mass of carbon black and from 40 to 100 parts by mass of silica per 100 parts by mass of the sulfur-crosslinkable diene rubber;
from 0.1 to 10 parts by mass of sulfur per 100 parts by mass of the sulfur-crosslinkable diene rubber;
from 0.1 to 10 parts by mass of at least one sulfur-containing vulcanization accelerator comprising sulfenamide compounds per 100 parts by mass of the sulfur-crosslinkable diene rubber;
from 0.5 to 20 parts by mass of at least one sulfur-containing silane coupling agent per 100 parts by mass of the sulfur-crosslinkable diene rubber; and
from 0.01 to 20 parts by mass of a phosphine borane compound represented by the formula (11) below per 100 parts by mass of the sulfur-crosslinkable diene rubber,
wherein a molar ratio of the phosphine borane compound with respect to the sulfur-containing silane coupling agent is from 0.01 to 2.5:

wherein R 11 and R 12 are each independently a hydrogen atom, an optionally substituted hydrocarbon group having from 1 to 18 carbon atoms or an optionally substituted aromatic group having from 6 to 18 carbon atoms; i and j are each independently an integer from 0 to 5.

2. The rubber composition according to claim 1 , wherein said sulfur-containing vulcanization accelerator is selected from sulfenamide compounds.

3. The rubber composition according to claim 2 , wherein said sulfenamide compounds comprise N-cyclohexyl-2-benzothiazole sulfenamide and N-t-butyl-2-benzothiazole sulfenamide.

4. The rubber composition according to claim 3 , wherein said sulfur-crosslinkable diene rubber is selected from the group consisting of aromatic vinyl-conjugated diene copolymer rubbers.

5. The rubber composition according to claim 4 , wherein said sulfur-crosslinkable diene rubber is a styrene-butadiene copolymer rubber.

6. The rubber composition according to claim 3 , wherein said phosphine borane compound is triphenylphosphine triphenylborane.

7. The rubber composition according to claim 6 , wherein said sulfur-crosslinkable diene rubber is selected from the group consisting of aromatic vinyl-conjugated diene copolymer rubbers.

8. The rubber composition according to claim 7 , wherein said sulfur-crosslinkable diene rubber is a styrene-butadiene copolymer rubber.

9. The rubber composition according to claim 2 , wherein said phosphine borane compound is triphenylphosphine triphenylborane.

10. The rubber composition according to claim 9 , wherein said sulfur-crosslinkable diene rubber is selected from the group consisting of aromatic vinyl-conjugated diene copolymer rubbers.

11. The rubber composition according to claim 10 , wherein said sulfur-crosslinkable diene rubber is a styrene-butadiene copolymer rubber.

12. The rubber composition according to claim 2 , wherein said sulfur-crosslinkable diene rubber is selected from the group consisting of aromatic vinyl-conjugated diene copolymer rubbers.

13. The rubber composition according to claim 12 , wherein said sulfur-crosslinkable diene rubber is a styrene-butadiene copolymer rubber.

14. The rubber composition according to claim 1 , wherein said phosphine borane compound is triphenylphosphine triphenylborane represented by the formula:

15. The rubber composition according to claim 14 , wherein said sulfur-crosslinkable diene rubber is selected from the group consisting of aromatic vinyl-conjugated diene copolymer rubbers.

16. The rubber composition according to claim 15 , wherein said sulfur-crosslinkable diene rubber is a styrene-butadiene copolymer rubber.

17. The rubber composition according to claim 1 , wherein said sulfur-crosslinkable diene rubber is selected from the group consisting of aromatic vinyl-conjugated diene copolymer rubbers.

18. The rubber composition according to claim 17 , wherein said sulfur-crosslinkable diene rubber is a styrene-butadiene copolymer rubber.

19. A pneumatic tire comprising at least one of a capped tread, a side wall, a belt, an inner liner, a carcass, or a bead formed from the rubber composition of claim 1 .

Assignees

• Yokohama Rubber Co Ltd

Inventors

• Tanabe Yusuke

Classifications

• B60C1/00 Primary

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

• C08K5/548

  containing sulfur {(C08K5/5477 takes precedence)} · CPC title

• B60C1/0041

  Compositions of the carcass layers · CPC title

• C08K3/38

  Boron-containing compounds · CPC title

• C08K5/55

  Boron-containing compounds {(C08K5/0091 takes precedence)} · CPC title