Additive composition for silica compound rubber composition, rubber composition and tire

Patent metadata

Field	Value
Publication number	US-2018030241-A1
Application number	US-201615551370-A
Country	US
Kind code	A1
Filing date	Feb 22, 2016
Priority date	Mar 5, 2015
Publication date	Feb 1, 2018
Grant date	—

Abstract

As an additive composition capable of improving the processability, the low loss property and the breaking resistance of a silica compounded rubber composition, and a rubber composition excellent in processability, low loss property and breaking resistance, this disclosure provides an additive composition for silica compounded rubber composition comprising a glycerin fatty acid ester, wherein: the glycerin fatty acid ester 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; and a monoester component is contained in an amount of 50 to 100 mass % in the glycerin fatty acid ester, and provides a rubber composition comprising a diene based rubber, a silica, and the additive composition for silica compounded rubber composition.

First claim

1 . An additive composition for silica compounded rubber composition comprising a glycerin fatty acid ester, wherein:
the glycerin fatty acid ester 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; and a monoester component is contained in an amount of 50 to 100 mass % in the glycerin fatty acid ester.

2 . The additive composition for silica compounded rubber composition according to claim 1 , wherein:
the fatty acids constituting the glycerin fatty acid ester have 8 to 22 carbon atoms.

3 . The additive composition for silica compounded rubber composition according to claim 1 , wherein:
among the two or more fatty acids constituting the glycerin fatty acid ester, 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.

4 . The additive composition for silica compounded rubber composition according to claim 3 , 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.

5 . A rubber composition comprising a diene based rubber, a silica, and the additive composition for silica compounded rubber composition according to claim 1 .

6 . The rubber composition according to claim 5 , wherein:
a mass ratio of the fatty acid with 16 carbon atoms and the fatty acid with 18 carbon atoms is 75/25 to 25/75.

7 . The rubber composition according to claim 5 , wherein:
the monoester component is contained in the glycerin fatty acid ester in an amount of 85 to 98 mass %.

8 . The rubber composition according to claim 5 , wherein:
a compounding amount of the additive composition for silica compounded rubber composition is 0.5 to 20 parts by mass per 100 parts by mass of the silica.

9 . The rubber composition according to claim 5 , wherein:
the silica is contained in an amount of 10 to 120 parts by mass per 100 parts by mass of the diene based rubber.

10 . The rubber composition according to claim 5 , wherein:
the diene based rubber contains a styrene-butadiene copolymer rubber.

11 . A tire using the rubber composition according to claim 5 .

12 . The additive composition for silica compounded rubber composition according to claim 2 , wherein:
among the two or more fatty acids constituting the glycerin fatty acid ester, 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.

13 . A rubber composition comprising a diene based rubber, a silica, and the additive composition for silica compounded rubber composition according to claim 2 .

14 . A rubber composition comprising a diene based rubber, a silica, and the additive composition for silica compounded rubber composition according to claim 3 .

15 . A rubber composition comprising a diene based rubber, a silica, and the additive composition for silica compounded rubber composition according to claim 4 .

16 . A tire using the rubber composition according to claim 6 .

17 . A tire using the rubber composition according to claim 7 .

18 . A tire using the rubber composition according to claim 8 .

19 . A tire using the rubber composition according to claim 9 .

20 . A tire using the rubber composition according to claim 10 .

Assignees

• Bridgestone Corp
• Kao Corp

Inventors

• Yonemoto Makiko
• Takano Tetsuo
• Konishi Motoi

Classifications

• B60C1/00 Primary

  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

• C08L21/00

  Compositions of unspecified rubbers · CPC title

• C08K3/36

  Silica · CPC title

• C08K5/103 Primary

  with polyalcohols · CPC title