Method for producing rubber composition, and rubber composition

Patent metadata

Field	Value
Publication number	US-10087292-B2
Application number	US-201515512164-A
Country	US
Kind code	B2
Filing date	Sep 11, 2015
Priority date	Sep 19, 2014
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

Provided is a method for producing a rubber composition that includes a rubber component (A) including natural rubber, at least one filler (B) selected from an inorganic filler and carbon black, and a monohydrazide compound (C) supported on a solid. The monohydrazide compound (C) is represented by general formula (I): R—CONHNH2, where R represents an alkyl group having from 1 to 30 carbon atoms, a cycloalkyl group having from 3 to 30 carbon atoms, or an aryl group. The method comprises compounding in an optional preliminary compounding stage and a plurality of compounding stages, and adding the monohydrazide compound (C) supported on the solid and kneading in the preliminary compounding stage and/or a first compounding stage. Also provided is a rubber composition produced with this method.

First claim

The invention claimed is:

1. A method for producing a rubber composition that includes a rubber component (A) including natural rubber, at least one filler (B) selected from an inorganic filler and carbon black, and a monohydrazide compound (C) supported on a solid, the method comprising:
compounding in an optional preliminary compounding stage and a plurality of compounding stages,
adding the monohydrazide compound (C) supported on the solid to the rubber component (A) and kneading them in the preliminary compounding stage and/or a first compounding stage, and
adding the filler (B) to the rubber component (A) and kneading them in the first compounding stage,
the monohydrazide compound (C) being represented by general formula (I):
R—CONHNH 2   (I)

where R represents an alkyl group having from 1 to 30 carbon atoms, a cycloalkyl group having from 3 to 30 carbon atoms, or an aryl group, and
the solid is one or more selected from the group consisting of silica, aluminum hydroxide, clay, calcium carbonate, talc, carbon black, stearic acid, waxes, and anti-aging agents.

2. The method of claim 1 , wherein
the R group of the monohydrazide compound (C) represented by general formula (I) is selected from the group consisting of alkyl groups having from 1 to 10 carbon atoms.

3. The method of claim 2 , wherein
the monohydrazide compound (C) represented by general formula (I) is propionic acid hydrazide.

4. The method of claim 1 , wherein
the solid is silica.

5. The method of claim 1 , wherein
a mass ratio of the monohydrazide compound (C) and the solid supporting the monohydrazide compound (C) is 10:1 to 1:30.

6. The method of claim 1 , further comprising
adding a portion or all of an anti-aging agent and kneading in a final compounding stage.

7. The method of claim 1 , wherein
the monohydrazide compound (C) is added and kneaded in the preliminary compounding stage.

Assignees

• Bridgestone Corp

Inventors

• Saiki Aya
• Uchiyama Toshihiro

Classifications

• C08L91/00

  Compositions of oils, fats or waxes; Compositions of derivatives thereof · CPC title

• C08J2411/00

  Characterised by the use of homopolymers or copolymers of chloroprene · CPC title

• C08K3/36

  Silica · CPC title

• C08J2415/02

  Rubber derivatives containing halogen · CPC title

• C08K9/04

  Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)} · CPC title