Elastomer reinforcement cord

Patent metadata

Field	Value
Publication number	US-12054885-B2
Application number	US-201917283593-A
Country	US
Kind code	B2
Filing date	Oct 29, 2019
Priority date	Oct 30, 2018
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

Provided is an elastomer reinforcement cord with improved rust resistance. An elastomer reinforcement cord 10 includes metal filaments and a polymer material. The elastomer reinforcement cord 10 has a multi-strand structure which includes: at least one core strand 21 formed by twisting plural metal filaments 1 a and 1 b together; and two or more sheath strands 22 each formed by twisting plural metal filaments 11 a and 11 b together, the sheath strands being twisted together around the core strand. An intra-sheath-strand filling rate a, which is a ratio of the area of the polymer material with respect to an intra-sheath-strand gap region A, is 52% or higher, and an inter-strand filling rate b, which is a ratio of the area of the polymer material with respect to an inter-strand gap region B, is 75% or higher.

First claim

The invention claimed is:

1. An elastomer reinforcement cord, comprising metal filaments and a polymer material,
wherein
the elastomer reinforcement cord has a multi-strand structure including: at least one core strand formed by twisting plural metal filaments together; and two or more sheath strands each formed by twisting plural metal filaments together, the sheath strands being twisted together around the core strand,
when, at a cross-section taken in a direction orthogonal to an axial direction after vulcanization, a region that is surrounded by a line connecting the centers of outermost-layer metal filaments of the respective sheath strands and occupied by other than the metal filaments is defined as an intra-sheath-strand gap region A, an intra-sheath-strand filling rate a, which is a ratio of the area of the polymer material with respect to the intra-sheath-strand gap region A, is 52% or higher, and
when, at a cross-section taken in a direction orthogonal to the axial direction after vulcanization, a region between outermost-layer metal filaments of the core strand and the outermost-layer metal filaments of the sheath strands facing the outermost-layer metal filaments of the core strand is defined as an inter-strand gap region B, an inter-strand filling rate b, which is a ratio of the area of the polymer material with respect to the inter-strand gap region B, is 75% or higher, and
wherein a distance between the outermost-layer metal filaments of the sheath strands is 20 μm or less.

2. The elastomer reinforcement cord according to claim 1 , wherein the polymer material has a melting point or softening point of 80° C. to 160° C.

3. The elastomer reinforcement cord according to claim 2 , wherein the polymer material has a melt flow rate, which is defined by JIS K7210, of 1.0 g/10 min or higher.

4. The elastomer reinforcement cord according to claim 3 , wherein
the core strand and the sheath strands each have a layer-strand structure including a core and at least one sheath layer, and
the core is formed by twisting three metal filaments together.

5. The elastomer reinforcement cord according to claim 3 , which is formed by twisting the metal filaments with resin filaments including the polymer material.

6. The elastomer reinforcement cord according to claim 2 , wherein
the core strand and the sheath strands each have a layer-strand structure including a core and at least one sheath layer, and
the core is formed by twisting three metal filaments together.

7. The elastomer reinforcement cord according to claim 2 , which is formed by twisting the metal filaments with resin filaments including the polymer material.

8. The elastomer reinforcement cord according to claim 1 , wherein the polymer material has a melt flow rate, which is defined by JIS K7210, of 1.0 g/10 min or higher.

9. The elastomer reinforcement cord according to claim 8 , wherein
the core strand and the sheath strands each have a layer-strand structure including a core and at least one sheath layer, and
the core is formed by twisting three metal filaments together.

10. The elastomer reinforcement cord according to claim 8 , which is formed by twisting the metal filaments with resin filaments including the polymer material.

11. The elastomer reinforcement cord according to claim 1 , wherein
the core strand and the sheath strands each have a layer-strand structure including a core and at least one sheath layer, and
the core is formed by twisting three metal filaments together.

12. The elastomer reinforcement cord according to claim 11 , which is formed by twisting the metal filaments with resin filaments including the polymer material.

13. The elastomer reinforcement cord according to claim 1 , which is formed by twisting the metal filaments with resin filaments including the polymer material.

14. The elastomer reinforcement cord according to claim 1 , wherein the polymer material comprises an ionomer and an acid-modified resin.

15. The elastomer reinforcement cord according to claim 1 , wherein 50% or more of the surface area of the outermost-layer metal filaments of each sheath strand is in a state of being in contact with the elastomer.

Assignees

• Bridgestone Corp

Inventors

• Ando Nobuhiro

Classifications

• D07B2501/2046

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• D07B2205/3025

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• D07B2205/2017

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