# US 2014/0154497 A1 · Gasket Material

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- Number: US 2014/0154497 A1
- Document ID: US20140154497A1
- Status: Published application
- Kind: A1
- Application number: 14/131,789
- Filed: 2012-07-12
- Published: 2014-06-05
- Earliest claimed: 2011-07-19
- Assignees: Nok Corporation
- Inventors: Atsushi Yokota; Isao Watanabe; Taichi Kano
- Web page: https://patentgrep.com/patent/US20140154497A1

## CPC

- B32B 15/046: {of foam}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/06: of {natural rubber or synthetic} rubber
- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- C08J 9/0066: {Use of inorganic compounding ingredients}
- C08J 9/32: from compositions containing microballoons, e.g. syntactic foams
- C09K 3/1006: {characterised by the chemical nature of one of its constituents}
- F16J 15/102: {characterised by material}
- B32B 2255/06: on metal layer
- B32B 2255/205: Metallic coating
- B32B 2266/0207: Materials belonging to B32B25/00
- B32B 2266/08: Closed cell foam
- B32B 2307/536: Hardness
- B32B 2307/714: Inert, i.e. inert to chemical degradation, corrosion
- B32B 2581/00: Seals; Sealing equipment; Gaskets
- C08J 2201/026: Crosslinking before of after foaming
- C08J 2203/22: Expandable microspheres, e.g. Expancel®
- C08J 2205/044: Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter
- C08J 2205/052: Closed cells, i.e. more than 50% of the pores are closed
- C08J 2205/06: Flexible foams
- C08J 2309/02: Copolymers with acrylonitrile
- C08J 2313/00: Characterised by the use of rubbers containing carboxyl groups
- C08J 2409/02: Copolymers with acrylonitrile
- C08J 2413/00: Characterised by the use of rubbers containing carboxyl groups
- C09K 2200/0612: Butadiene-acrylonitrile rubber
- Y10T 428/249976: Voids specified as closed
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The purpose of the present invention is to provide a gasket material that is capable of preventing corrosion caused by sulfur element, can be used as a seal part for a product that is easily damaged by corrosion, such as an electronic part, and is capable of forming a tight seal under low surface pressure with a material having low rigidity and inadequate reliability such as to have a blowhole, and that can prevent reduction in bolt axial load without producing plastic flow (setting) under pressure. The purpose is achieved by a gasket material in which a foamed rubber layer having a closed cell structure is formed, via an adhesive layer, on at least one side of a metal plate, wherein the foamed rubber layer comprises a carboxyl group-modified nitrile rubber, the expansion ratio of the foamed rubber layer is 2.0 to 3.0, and the foamed rubber layer is crosslinked with an epoxy compound.

## Claims

### Claim 1

A gasket material in which a foamed rubber layer having a closed cell structure is formed, via an adhesive layer, on at least one side of a metal plate, wherein the foamed rubber layer comprises a carboxyl group-modified nitrile rubber, the expansion ratio of the foamed rubber layer is 2.0 to 3.0, and the foamed rubber layer is crosslinked with an epoxy compound.

### Claim 2 (depends on 1)

The gasket material according to claim 1, wherein the foamed rubber layer further comprises 2-ethyl-4-methylimidazole as a crosslinking accelerator.

### Claim 3 (depends on 1)

The gasket material according to claim 1, wherein the expansion ratio of the foamed rubber layer is 2.3 to 2.8.

### Claim 4 (depends on 1)

The gasket material according to claim 1 used in a seal part of an electronic part.