Rubber-reinforcing cord and rubber product including same

Patent metadata

Field	Value
Publication number	US-10913830-B2
Application number	US-201615579822-A
Country	US
Kind code	B2
Filing date	Jul 13, 2016
Priority date	Jul 15, 2015
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

A rubber-reinforcing cord ( 30 ) according to the present invention includes: a reinforcing fiber or reinforcing fiber bundle ( 21 ); a first coating ( 22 ) provided to cover the reinforcing fiber or reinforcing fiber bundle ( 21 ); and a second coating ( 31 ) provided to cover the first coating ( 22 ) and be located at the outer surface of the rubber-reinforcing cord ( 30 ). The first coating ( 22 ) includes: first rubber including nitrile-based rubber as a main component; and a first crosslinking agent. The second coating ( 31 ) is a coating different from the first coating ( 22 ) and includes: second rubber consisting essentially of nitrile-based rubber; and a second crosslinking agent. The nitrile-based rubber is at least one selected from nitrile rubber, hydrogenated nitrile rubber, carboxylated nitrile rubber, and carboxylated hydrogenated nitrile rubber.

First claim

The invention claimed is:

1. A rubber-reinforcing cord for reinforcing a rubber product, comprising:
a reinforcing fiber or a reinforcing fiber bundle;
a first coating provided to cover the reinforcing fiber or the reinforcing fiber bundle; and
a second coating provided to cover the first coating and be located at an outer surface of the rubber-reinforcing cord,
wherein the first coating comprises: a first rubber comprising a first nitrile-based rubber as a main component; and a first crosslinking agent,
the second coating is a coating different from the first coating and comprises: a second rubber consisting essentially of a second nitrile-based rubber; and a second crosslinking agent, or a second rubber consisting essentially of the second nitrile-based rubber; a second crosslinking agent and a filler,
the first and second nitrile-based rubbers are at least one selected from nitrile rubber, hydrogenated nitrile rubber, carboxylated nitrile rubber, and carboxylated hydrogenated nitrile rubber,
the second crosslinking agent comprises a maleimide crosslinking agent and an isocyanate compound,
a content of the maleimide crosslinking agent in the second coating is in a range from 30 parts to 50 parts by mass relative to 100 parts by mass of the second rubber,
a content of the isocyanate compound in the second coating is in a range from 25 parts to 50 parts by mass relative to 100 parts by mass of the second rubber, and
a content of the filler in the second coating is in a range of 20 parts or less by mass relative to 100 parts by mass of the second rubber.

2. The rubber-reinforcing cord according to claim 1 , wherein the first rubber consists essentially of the first nitrile-based rubber.

3. The rubber-reinforcing cord according to claim 1 , wherein the first coating is a coating formed by drying a first water-based treatment agent comprising the first rubber and the first crosslinking agent as main components.

4. The rubber-reinforcing cord according to claim 1 , wherein the second coating is a coating formed by drying a second water-based treatment agent comprising the second rubber and the second crosslinking agent as main components.

5. A rubber product reinforced by the rubber-reinforcing cord according to claim 1 .

6. The rubber product according to claim 5 , being a rubber belt comprising matrix rubber and the rubber-reinforcing cord embedded in the matrix rubber.

7. The rubber-reinforcing cord according to claim 1 , wherein the first crosslinking agent comprises a maleimide crosslinking agent.

8. The rubber-reinforcing cord according to claim 1 , wherein
the content of the filler in the second coating is 0 part by mass relative to 100 parts by mass of the second rubber.

Assignees

• Nippon Sheet Glass Co Ltd

Inventors

• Katagiri Shinya

Classifications

• C03C25/50 Primary

  Coatings containing organic materials only · CPC title

• D06M13/418

  Cyclic amides, e.g. lactams; Amides of oxalic acid · CPC title

• D06M2200/50

  Modified hand or grip properties; Softening compositions · CPC title

• D02G3/44

  Yarns or threads characterised by the purpose for which they are designed {(protective gloves A41D19/00; protective clothing A62B17/00; ropes D07B1/02)} · CPC title

• C08J5/06 Primary

  using pretreated fibrous materials · CPC title