Rubber-reinforcing cord and rubber product using same

Patent metadata

Field	Value
Publication number	US-11427959-B2
Application number	US-201615777784-A
Country	US
Kind code	B2
Filing date	Dec 16, 2016
Priority date	Dec 21, 2015
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A rubber-reinforcing cord ( 10 ) includes a first fiber strand ( 11 ) and a plurality of second fiber strands ( 12 ) disposed around the first fiber strand ( 11 ). The second fiber strand ( 12 ) has a tensile elastic modulus higher by 20 GPa or more than that of the first fiber strand ( 11 ).

First claim

The invention claimed is:

1. A rubber-reinforcing cord comprising:
a first fiber strand; and
a plurality of second fiber strands disposed around the first fiber strand,
wherein each of the second fiber strands has a tensile elastic modulus that is higher by 20 GPa or more than a tensile elastic modulus of the first fiber strand, and
a number of twists in the first fiber strand is equal to or greater than a number of twists in each of the second fiber strands.

2. The rubber-reinforcing cord according to claim 1 , wherein a total cross-sectional area of the second fiber strands ranges from 64 to 95% of the sum of a total cross-sectional area of the first fiber strand and the total cross-sectional area of the second fiber strands.

3. The rubber-reinforcing cord according to claim 1 , wherein the second fiber strands are given final twists in a range from 0.8 to 3.5 twists/25 mm.

4. The rubber-reinforcing cord according to claim 1 , wherein the second fiber strands are not given primary twists.

5. The rubber-reinforcing cord according to claim 1 , wherein fibers of the first fiber strand comprise aramid fibers and fibers of each of the second fiber strands comprise carbon fibers.

6. The rubber-reinforcing cord according to claim 5 , wherein fibers of the first fiber strand consist of aramid fibers and fibers of each of the second fiber strands consist of carbon fibers.

7. The rubber-reinforcing cord according to claim 1 , wherein each of the second fiber strands comprises a coating provided on a surface thereof, and the coating comprises a rubber component.

8. A rubber product comprising:
a rubber matrix; and
the rubber-reinforcing cord according to claim 1 , the rubber-reinforcing cord being embedded in the rubber matrix.

9. The rubber product according to claim 8 , wherein the rubber product is a rubber belt.

10. The rubber reinforcing cord according to claim 4 , wherein each of the second fiber strands is formed by bundling fiber filaments.

Assignees

• Nippon Sheet Glass Co Ltd

Inventors

• Katagiri Shinya

Classifications

• D02G3/48 Primary

  Tyre cords {(tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606)} · CPC title

• D02G3/446

  Yarns or threads for use in automotive applications · CPC title

• D07B1/0666

  the wires being characterised by an anti-corrosive or adhesion promoting coating · CPC title

• D02G3/447

  Yarns or threads for specific use in general industrial applications, e.g. as filters or reinforcement · CPC title

• D07B2201/2067

  characterised by the elongation or tension behaviour · CPC title