Reinforcement cord for reinforcing rubber product, and rubber product using same

Patent metadata

Field	Value
Publication number	US-10041194-B2
Application number	US-201214119017-A
Country	US
Kind code	B2
Filing date	Jun 8, 2012
Priority date	Jun 10, 2011
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

The reinforcing cord of the present invention includes at least one strand. The strand includes a bundle of filaments that are bundled and twisted together in one direction, and a coating layer that is formed on at least the surface of the bundle. The bundle consists essentially of carbon fiber filaments. The coating layer is a coating layer that is formed from an aqueous treatment agent containing a rubber latex and a crosslinking agent as essential components and a filler as an optional component. In the aqueous treatment agent, the total of the mass of the crosslinking agent and the mass of the filler is in a range of 1 to 50% of the mass of rubber in the rubber latex.

First claim

What is claimed is:

1. A reinforcing cord for reinforcing a rubber product, comprising at least one strand, wherein
the strand comprises: a bundle of filaments that are bundled and twisted together in one direction; and a coating layer that is formed on at least a surface of the bundle,
the bundle consists essentially of carbon fiber filaments,
the coating layer is a coating layer that is formed from an aqueous treatment agent which is free of a resorcinol-formaldehyde condensation product and contains a rubber latex and a crosslinking agent as essential components and a filler as an optional component, and
in the aqueous treatment agent, a mass of the crosslinking agent is in a range of 1 to 25% with respect to a mass of rubber in the rubber latex.

2. The reinforcing cord according to claim 1 , wherein the number of the carbon fiber filaments in the bundle is in a range of 500 to 48000.

3. The reinforcing cord according to claim 1 , wherein
a surface of the carbon fiber filament in the bundle is treated with a sizing agent, and
the sizing agent contains at least one selected from the group consisting of an epoxy group and an amino group.

4. The reinforcing cord according to claim 1 , wherein in the aqueous treatment agent, the mass of the filler is in a range of 1 to 20% of the mass of the rubber in the rubber latex.

5. The reinforcing cord according to claim 1 , wherein in the aqueous treatment agent, the mass of the crosslinking agent is in a range of 1 to 25%, the mass of the filler is in a range of 1 to 20%, and the total of the mass of the crosslinking agent and the mass of the filler is in a range of 2 to 45%, with respect to the mass of the rubber in the rubber latex.

6. The reinforcing cord according to claim 1 , wherein a mass of the coating layer is in a range of 7 to 30% of a mass of the bundle of filaments.

7. The reinforcing cord according to claim 1 , wherein the aqueous treatment agent contains, as a main component, a latex of at least one rubber selected from the group consisting of nitrile rubber, hydrogenated nitrile rubber, carboxyl-modified nitrile rubber, and carboxyl-modified hydrogenated nitrile rubber.

8. The reinforcing cord according to claim 1 , wherein the crosslinking agent contains at least one selected from the group consisting of a maleimide crosslinking agent and polyisocyanate.

9. The reinforcing cord according to claim 1 , wherein the filler contains at least one selected from the group consisting of silica and carbon black.

10. A rubber product that is reinforced by the reinforcing cord according to claim 1 .

11. The rubber product according to claim 10 , being a transmission belt.

12. The rubber product according to claim 11 , being a synchronous transmission belt or a friction transmission belt.

13. The rubber product according to claim 12 , being a toothed belt, a flat belt, a round belt, a V belt, or a V-ribbed belt.

14. The reinforcing cord according to claim 1 , wherein the aqueous treatment agent contains filler.

15. The reinforcing cord according to claim 14 , wherein the filler comprises silica.

16. The reinforcing cord according to claim 14 , wherein a mass of filler is in a range of 1 to 20% with respect to a mass of rubber in the rubber latex.

17. The reinforcing cord according to claim 14 , wherein a mass of filler is in a range of 1 to 10% with respect to a mass of rubber in the rubber latex.

18. The reinforcing cord according to claim 14 , wherein a mass of filler is in a range of 1 to 5% with respect to a mass of rubber in the rubber latex.

19. The reinforcing cord according to claim 15 , wherein a mass of filler is in a range of 1 to 5% with respect to a mass of rubber in the rubber latex.

Assignees

• Furusawa Masamori
• Nippon Sheet Glass Co Ltd

Inventors

• Furusawa Masamori

Classifications

• Y10T428/2918

  including free carbon or carbide or therewith [not as steel] · CPC title

• F16G5/06

  with reinforcement bonded by the rubber · CPC title

• F16G1/08

  with reinforcement bonded by the rubber · CPC title

• F16G1/28

  with a contact surface of special shape, e.g. toothed · CPC title

• F16G5/20

  with a contact surface of special shape, e.g. toothed · CPC title