Rubber composition for tire and tire

Patent metadata

Field	Value
Publication number	US-2018030215-A1
Application number	US-201615551316-A
Country	US
Kind code	A1
Filing date	Feb 22, 2016
Priority date	Mar 5, 2015
Publication date	Feb 1, 2018
Grant date	—

Abstract

This disclosure provides a rubber composition for tire obtainable by a method for producing a rubber composition comprising: (a) preparing a preliminary composition by preparing a first mixture containing all of or a part of a diene based rubber (A), a silica (B), a silane coupling agent (C) and an activator (D), and containing a glycerin fatty acid ester (E), and kneading the first mixture; and (b) preparing the rubber composition by adding a vulcanizing agent (t,F) into the preliminary composition to prepare a second mixture, and kneading the second mixture, wherein: the glycerin fatty acid ester (E) is an ester of a glycerin and two or more fatty acids, a fatty acid component which is the most among the two or more fatty acids constituting the glycerin fatty acid ester being 10 to 90 mass % of all the fatty acids.

First claim

1 . A rubber composition for tire obtainable by a method for producing a rubber composition comprising:
(a) preparing a preliminary composition by preparing a first mixture containing all of or a part of a diene based rubber (A), a silica (B), a silane coupling agent (C) and at least one activator (D) selected from vulcanization accelerators, cysteines, thioureas, ammonium thiocyanates, zinc dialkyl dithiophosphates or thiadiazoles, and containing a glycerin fatty acid ester (E), and kneading the first mixture; and (b) preparing the rubber composition by adding a vulcanizing agent (F) into the preliminary composition to prepare a second mixture, and kneading the second mixture, wherein:
the glycerin fatty acid ester (E) is an ester of a glycerin and two or more fatty acids, a fatty acid component which is the most among the two or more fatty acids constituting the glycerin fatty acid ester being 10 to 90 mass % of all fatty acids.

2 . The rubber composition for tire according to claim 1 , wherein:
the fatty acid component which is the most among the two or more fatty acids is 15 to 80 mass % of all the fatty acids.

3 . The rubber composition for tire according to claim 1 , wherein:
the glycerin fatty acid ester (E) contains 50 to 100 mass % of a glycerin fatty acid monoester.

4 . The rubber composition for tire according to claim 3 , wherein:
the glycerin fatty acid ester (E) contains 60 to 99 mass % of a glycerin fatty acid monoester.

5 . The rubber composition for tire according to claim 4 , wherein:
the glycerin fatty acid ester (E) contains 85 to 98 mass % of a glycerin fatty acid monoester.

6 . The rubber composition for tire according to claim 1 , wherein:
the fatty acids constituting the glycerin fatty acid ester (E) have 8 to 22 carbon atoms.

7 . The rubber composition for tire according to claim 6 , wherein:
among the two or more fatty acids constituting the glycerin fatty acid ester (E), one among the most fatty acid component and a second most fatty acid component is a fatty acid with 16 carbon atoms, and the other is a fatty acid with 18 carbon atoms.

8 . The rubber composition for tire according to claim 7 , wherein:
a mass ratio of the fatty acid with 16 carbon atoms and the fatty acid with 18 carbon atoms is 90/10 to 10/90.

9 . The rubber composition for tire according to claim 1 , wherein:
a compounding amount of the glycerin fatty acid ester (E) is 0.5 to 20 parts by mass per 100 parts by mass of the silica (B).

10 . The rubber composition for tire according to claim 1 , wherein:
the activator (D) is at least one selected from thiourea, diethylthiourea or thiadiazoles.

11 . A tire using the rubber composition for tire according to claim 1 .

12 . The rubber composition for tire according to claim 2 , wherein:
the glycerin fatty acid ester (E) contains 50 to 100 mass % of a glycerin fatty acid monoester.

13 . The rubber composition for tire according to claim 2 , wherein:
the fatty acids constituting the glycerin fatty acid ester (E) have 8 to 22 carbon atoms.

14 . The rubber composition for tire according to claim 2 , wherein:
a compounding amount of the glycerin fatty acid ester (E) is 0.5 to 20 parts by mass per 100 parts by mass of the silica (B).

15 . The rubber composition for tire according to claim 2 , wherein:
the activator (D) is at least one selected from thiourea, diethylthiourea or thiadiazoles.

16 . A tire using the rubber composition for tire according to claim 2 .

17 . The rubber composition for tire according to claim 3 , wherein:
the fatty acids constituting the glycerin fatty acid ester (E) have 8 to 22 carbon atoms.

18 . The rubber composition for tire according to claim 3 , wherein:
a compounding amount of the glycerin fatty acid ester (E) is 0.5 to 20 parts by mass per 100 parts by mass of the silica (B).

19 . The rubber composition for tire according to claim 3 , wherein:
the activator (D) is at least one selected from thiourea, diethylthiourea or thiadiazoles.

20 . A tire using the rubber composition for tire according to claim 3 .

Assignees

• Bridgestone Corp

Inventors

• Yonemoto Makiko

Classifications

• C08J2409/00

  Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C08K5/54

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

• C08J3/20

  Compounding polymers with additives, e.g. colouring · CPC title

• C08J2309/06

  Copolymers with styrene · CPC title

• C08J3/22 Primary

  using masterbatch techniques · CPC title