Rubber composition for conveyor belts, rubber for conveyor belt covers, and conveyor belt

Patent metadata

Field	Value
Publication number	US-9765206-B2
Application number	US-201314371917-A
Country	US
Kind code	B2
Filing date	Jan 11, 2013
Priority date	Jan 13, 2012
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

Rubber composition for conveyor belts containing (A) a rubber component that contains a styrene-butadiene rubber mixture having a mean styrene content of from 28 to 35% by mass, which contains one or more types of styrene-butadiene rubber having a styrene content of from 20 to 25% by mass and one or more types of styrene-butadiene rubber having a styrene content of from more than 25 to 50% by mass, and at least one selected from butadiene rubber and natural rubber in a specific ratio, (B) silica, (C) resin, and (D) specific carbon black in a specific ratio; a rubber for conveyor belt covers, formed by using the rubber composition; and a conveyor belt cover provided by using the rubber composition.

First claim

The invention claimed is:

1. A rubber composition for conveyor belts, which contains, relative to (A) 100 parts by mass of a rubber component therein containing from 100 to 70 parts by mass of styrene-butadiene rubber and from 0 to 30 parts by mass of at least one selected from butadiene rubber and natural rubber, (B) from 5 to 20 parts by mass of silica, (C) from 10 to 25 parts by mass of resin, and (D) from 40 to 70 parts by mass of carbon black having a nitrogen adsorption specific surface area, which is measured according to JIS K 6217-2:2001, of 100 m 2 /g or more, and wherein the styrene-butadiene rubber is a styrene-butadiene rubber mixture having a mean styrene content of from 28 to 35% by mass, which contains one or more types of styrene-butadiene rubber having a styrene content of from 20 to 25% by mass and one or more types of styrene-butadiene rubber having a styrene content of from more than 25 to 50% by mass.

2. The rubber composition for conveyor belts according to claim 1 , wherein the styrene-butadiene rubber mixture contains from 40 to 70% by mass of styrene-butadiene rubber having a styrene content of from 20 to 25% by mass and from 30 to 60% by mass of styrene-butadiene rubber having a styrene content of from more than 25 to 50% by mass.

3. A rubber for conveyor belt covers, formed by using the rubber composition of claim 1 .

4. A conveyor belt provided by using the rubber composition of claim 1 .

5. A rubber for conveyor belt covers, formed by using the rubber composition of claim 1 .

6. A conveyor belt provided by using the rubber composition of claim 2 .

7. The rubber composition for conveyor belt according to claim 1 , wherein the resin is at least one selected from the group consisting of rosin resins, dicyclopentadiene resins, petroleum hydrocarbon resins, aromatic polycarboxylic acid-aliphatic polyalcohol condensates, and simple substance of cumarone resins or their blends.

8. The rubber composition for conveyor belt according to claim 1 , wherein the styrene-butadiene rubber is a styrene-butadiene rubber mixture having a mean styrene content of from 28 to 35% by mass, which contains one or more types of styrene-butadiene rubber having a styrene content of from 22 to 25% by mass and one or more types of styrene-butadiene rubber having a styrene content of from more than 30 to 50% by mass.

9. The rubber composition for conveyor belt according to claim 1 , wherein the styrene-butadiene rubber is a styrene-butadiene rubber mixture having a mean styrene content of from 30 to 35% by mass, which contains one or more types of styrene-butadiene rubber having a styrene content of from 22 to 25% by mass and one or more types of styrene-butadiene rubber having a styrene content of from more than 40 to 50% by mass.

10. The rubber composition for conveyor belt according to claim 7 , wherein the resin is petroleum hydrocarbon resins.

11. The rubber composition for conveyor belt according to claim 10 , wherein the petroleum hydrocarbon resins is at least one selected from aliphatic and aromatic petroleum hydrocarbon resins.

Assignees

• Bridgestone Corp

Inventors

• Furuhata Yosuke

Classifications

• C08K3/36

  Silica · CPC title

• C08L9/00

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

• C08L9/06 Primary

  Copolymers with styrene · CPC title

• C08L93/04

  Rosin · CPC title

• C08L91/06

  Waxes · CPC title