Rubber composition, tire, bisphenyldiamine compound, and anti-aging agent

Patent metadata

Field	Value
Publication number	US-10011704-B2
Application number	US-201515312768-A
Country	US
Kind code	B2
Filing date	May 22, 2015
Priority date	May 22, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

Provided is a rubber composition that has better weather resistance than conventional rubber compositions and can inhibit rubber article surface discoloration. The rubber composition contains at least one rubber component selected from natural rubber and diene-based synthetic rubbers and, blended therewith, at least one bisphenyldiamine compound represented by formula (I). In formula (I), R 1 , R 2 , R 5 , and R 6 each represent, independently of one another, a hydrogen atom, an alkyl group having a carbon number of 1-10, or a phenyl group, but R 1 and R 2 do not both simultaneously represent a hydrogen atom and R 5 and R 6 do not both simultaneously represent a hydrogen atom, R 3 and R 4 each represent, independently of one another, an alkyl group having a carbon number of 1-8 or an aralkyl group, A represents an alkylene group having a carbon number of 1-12, and l, m, and n each represent an integer of 0 or 1.

First claim

The invention claimed is:

1. A bisphenyldiamine compound represented by formula (I) shown below

where, in formula (I), R 1 , R 2 , R 5 , and R 6 each represent, independently of one another, a hydrogen atom, an alkyl group having a carbon number of 1-10, or a phenyl group, but R 1 and R 2 do not both simultaneously represent a hydrogen atom and R 5 and R 6 do not both simultaneously represent a hydrogen atom, R 3 and R 4 each represent, independently of one another, an alkyl group having a carbon number of 1-8 or an aralkyl group, A represents an alkylene group having a carbon number of 1-12, and l, m, and n each represent an integer of 0 or 1, wherein either (i) at least one of R 1 , R 2 , R 5 , or R 6 is a phenyl group, at least of one l, m, or n is 1, and m=n, or (ii) one of R 1 and R 2 is a hyfrogen atom, one of R 5 and R 6 is a hydrogen atom, and m=n=1.

2. An anti-aging agent for natural rubber and diene-based synthetic rubber-use comprising the bisphenyldiamine compound of claim 1 .

3. A rubber composition comprising
at least one rubber component selected from natural rubber and diene-based synthetic rubbers and, blended therewith, at least one bisphenyldiamine compound represented by formula (I) shown below

where, in formula (I), R 1 , R 2 , R 5 , and R 6 each represent, independently of one another, a hydrogen atom, an alkyl group having a carbon number of 1-10, or a phenyl group, but R 1 and R 2 do not both simultaneously represent a hydrogen atom and R 5 and R 6 do not both simultaneously represent a hydrogen atom, R 3 and R 4 each represent, independently of one another, an alkyl group having a carbon number of 1-8 or an aralkyl group, A represents an alkylene group having a carbon number of 1-12, and l, m, and n each represent an integer of 0 or 1, wherein either (i) at least one of R 1 , R 2 , R 5 , or R 6 is a phenyl group, at least one of l, m or n is 1, and m=n, or (ii) m=n=1.

4. The rubber composition of claim 3 , wherein
in the at least one bisphenyldiamine compound represented by formula (I), R 3 and R 4 are each an alkyl group having a carbon number of 1-8, A is an alkylene group having a carbon number of 1-8, l is 1, and m and n are each 0.

5. The rubber composition of claim 3 , wherein
a blending amount of the at least one bisphenyldiamine compound represented by formula (I) is in a range of from 0.2 parts by mass to 10 parts by mass relative to 100 parts by mass of the at least one rubber component.

6. A tire comprising a tire member comprising the rubber composition of claim 3 .

7. The tire of claim 6 , wherein
the tire member is either or both of a tread and a sidewall.

Assignees

• Otsuka Chemical Co Ltd

Inventors

• Saiki Aya
• Minashima Hidehiro
• Yano Yuzaburo
• Shiina Noriaki
• Kodama Kazuhiro
• Ueno Mifuyu
• Sato Takashi
• Nakashima Shinya
• Abe Masaki

Classifications

• B60C1/0016

  Compositions of the tread · CPC title

• B60C1/0025

  Compositions of the sidewalls · CPC title

• C08K5/20

  Carboxylic acid amides · CPC title

• C07C237/04

  the carbon skeleton being acyclic and saturated · CPC title

• C07C211/55

  Diphenylamines · CPC title