Rubber composition for tire

Patent metadata

Field	Value
Publication number	US-10544287-B2
Application number	US-201515514620-A
Country	US
Kind code	B2
Filing date	Sep 28, 2015
Priority date	Oct 1, 2014
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

The rubber composition of the present invention is prepared by mixing a rubber component (A), zinc oxide (B), and a co-condensate (C) having a softening point of 150° C. or lower and containing a p-tert-butylphenol-derived constituent unit represented by the following formula (1), an o-phenylphenol-derived constituent unit represented by the following formula (2) and a resorcinol-derived constituent unit represented by the following formula (3), wherein the nitrogen adsorption specific surface area (N 2 SA) of the zinc oxide (B) measured according to the BET method is 6 m 2 /g or more and 110 m 2 /g or less, the mixing amount of the zinc oxide (B) is 5 parts by mass or more and 13 parts by mass or less based on 100 parts by mass of the rubber component (A), and the mixing amount of the co-condensate (C) is 0.1 parts by mass or more and 10 parts by mass or less based on 100 parts by mass of the rubber component (A). The co-condensate (C) is usable as a replacement for p-tert-octylphenol and p-nonylphenol, has a softening point lower than the maximum temperature in a rubber processing step, and has excellent dispersibility in rubber.

First claim

The invention claimed is:

1. A rubber composition for tires, which is prepared by mixing a rubber component (A), zinc oxide (B), and a co-condensate (C) having a softening point of 150° C. or lower and containing a p-tert-butylphenol-derived constituent unit represented by the following formula (1), an o-phenylphenol-derived constituent unit represented by the following formula (2) and a resorcinol-derived constituent unit represented by the following formula (3), wherein:
the zinc oxide (B) is one prepared by mixing one having a nitrogen adsorption specific surface area (N 2 SA) measured according to BET method of 40 m 2 /g or more and 55 m 2 /g or less and another having a nitrogen adsorption specific surface area (N 2 SA) measured according to the BET method of 6 m 2 /g or more and 10 m 2 /g or less,
the mixing amount of the zinc oxide (B) is 5 parts by mass or more and 13 parts by mass or less based on 100 parts by mass of the rubber component (A), and
the mixing amount of the co-condensate (C) is 0.1 parts by mass or more and 10 parts by mass or less based on 100 parts by mass of the rubber component (A):

2. The rubber composition for tires according to claim 1 , a filler is further mixed, wherein the filler is selected from carbon black and an inorganic filler, and the proportion of carbon black in the filler is 80% by mass or more.

3. The rubber composition for tires according to claim 1 , wherein the mixing amount of the zinc oxide (B) is 6 parts by mass or more and 12 parts by mass or less based on 100 parts by mass of the rubber component (A).

4. The rubber composition for tires according to claim 1 wherein the mixing amount of the co-condensate (C) is 0.2 parts by mass or more and 8 parts by mass or less based on 100 parts by mass of the rubber component (A).

5. The rubber composition for tires according to claim 1 , wherein the softening point of the co-condensate (C) is 80° C. or higher and 150° C. or lower.

6. The rubber composition for tires according to claim 1 , wherein the softening point of the co-condensate (C) is 80° C. or higher and 140° C. or lower.

7. A tire using the rubber composition for tires of claim 1 .

Assignees

• Bridgestone Corp

Inventors

• Yamagishi Junichi
• Musha Shinichi
• KANATOMI Yoshihiko

Classifications

• C08L21/00

  Compositions of unspecified rubbers · CPC title

• C08K3/22

  of metals · CPC title

• B60C1/00

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

• C08L9/00

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C08L7/00 Primary

  Compositions of natural rubber · CPC title