Rubber masterbatch, method for producing the same, and rubber composition obtained from the same

Patent metadata

Field	Value
Publication number	US-10273350-B2
Application number	US-201715800317-A
Country	US
Kind code	B2
Filing date	Nov 1, 2017
Priority date	Dec 20, 2016
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

There are provided a rubber masterbatch which can give a vulcanized rubber having a low hysteresis loss while having a low electrical resistance (low volume electrical resistance value); and a method for producing the rubber masterbatch. The rubber master-batch is a rubber masterbatch including a diene rubber, a carbon nanotube, and a silane coupling agent, and the carbon nanotube shows a weight loss proportion of 10 to 30% by weight in a range from 200 to 600° C. in a thermogravimetry of the carbon nanotube.

First claim

What is claimed is:

1. A rubber masterbatch, comprising a diene rubber, a carbon nanotube, and a silane coupling agent,
wherein the carbon nanotube shows a weight loss proportion of 10 to 30% by weight in a range from 200 to 600° C. in a thermogravimetry of the carbon nanotube.

2. A rubber composition obtained from the rubber masterbatch recited in claim 1 .

3. A method for producing the rubber masterbatch recited in claim 1 , comprising the step of dry-mixing and/or wet-mixing the diene rubber, the carbon nanotube, and the silane coupling agent with each other.

4. The method for producing the rubber masterbatch according to claim 3 , comprising:
a step (i-(a)) of wet-mixing a rubber latex solution of the diene rubber with a dispersion liquid including the carbon nanotube to produce a carbon-nanotube-including rubber latex solution;
a step ii-(a)) of drying the resultant carbon-nanotube-including rubber latex solution to produce a carbon-nanotube-including rubber composite; and
a step (iii-(a)) of adding the silane coupling agent to the resultant carbon-nanotube-including rubber composite, and dry-mixing these materials with each other.

5. The method for producing the rubber masterbatch according to claim 3 , comprising:
a step (i-(b)) of wet-mixing a rubber latex solution of the diene rubber, a dispersion liquid including the carbon nanotube, and the silane coupling agent with each other to produce a rubber latex solution which includes the carbon nanotube and the silane coupling agent; and
a step (ii-(b)) of drying the resultant rubber latex solution, which includes the carbon nanotube and the silane coupling agent, to produce a rubber composite which includes the carbon nanotube and the silane coupling agent.

Assignees

• Toyo Tire & Rubber Co
• Toyo Tire Corp

Inventors

• Sagitani Satoshi

Classifications

• C08L9/06 Primary

  Copolymers with styrene · CPC title

• C08K5/548

  containing sulfur {(C08K5/5477 takes precedence)} · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L9/08

  Latex · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title