Sealing material and method for producing same

Patent metadata

Field	Value
Publication number	US-9360113-B2
Application number	US-201314381876-A
Country	US
Kind code	B2
Filing date	Feb 28, 2013
Priority date	Feb 28, 2012
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

Provided is a sealing material that exhibits excellent sealing property at a low contact pressure and a method for producing the same. A sealing material according to the present invention is a sealing material including a metal plate and a foamed rubber layer formed on one surface, or each of both surfaces, of the metal plate, in which the foamed rubber layer has a closed cell rate of 50% or more, and a surface of the foamed rubber layer has a maximum height determined by a method in conformity to JIS B 0601-2001 of 40 μm or less.

First claim

The invention claimed is:

1. A sealing material, comprising only one metal plate and a foamed rubber layer formed on both surfaces of the metal plate, wherein the metal plate has a thickness of from 0.1 to 0.3 mm, the foamed rubber layer has a closed cell rate of 50% or more, the foamed rubber layer is formed by foaming a rubber composition layer excluding a microcapsule-type foaming agent, and a surface of the foamed rubber layer has a maximum height Rz determined by a method in conformity to JIS B 0601-2001 of 40 μm or less.

2. The sealing material according to claim 1 , wherein a result obtained by a test of a cross-cut method in conformity to JIS K5600-5-6 after immersion in water corresponds to Class 0, Class 1, or Class 2.

3. The sealing material according to claim 2 , wherein the foamed rubber layer is formed by foaming a rubber composition layer including a thermally-degradable foaming agent.

4. The sealing material according to claim 3 , wherein the foamed rubber layer is formed by heating a rubber composition layer formed on the both surfaces of the metal plate at a temperature equal to or higher than a cross-linking temperature and lower than a foaming temperature, and then heating the rubber composition layer at a temperature equal to or higher than the foaming temperature.

5. The sealing material according to claim 2 , wherein the foamed rubber layer is formed by heating a rubber composition layer formed on the both surfaces of the metal plate at a temperature equal to or higher than a cross-linking temperature and lower than a foaming temperature, and then heating the rubber composition layer at a temperature equal to or higher than the foaming temperature.

6. The sealing material according to claim 1 , wherein the foamed rubber layer is formed by foaming a rubber composition layer including a thermally-degradable foaming agent.

7. The sealing material according to claim 6 , wherein the foamed rubber layer is formed by heating a rubber composition layer formed on the both surfaces of the metal plate at a temperature equal to or higher than a cross-linking, temperature and lower than a foaming temperature, and then heating the rubber composition layer at a temperature equal to or higher than the foaming temperature.

8. The sealing, material according to claim 1 , wherein the foamed rubber layer is formed by heating a rubber composition layer formed on the both surfaces of the metal plate at a temperature equal to or higher than a cross-linking temperature and lower than a foaming temperature, and then heating the rubber composition layer at a temperature equal to or higher than the foaming temperature.

9. The sealing material according to claim 1 , wherein the foamed rubber layer has a closed cell rate of 60% or more.

10. The sealing material according to claim 1 , wherein the foamed rubber layer has a closed cell rate of 70% or more.

11. The sealing material according to claim 1 , wherein the foamed rubber layer has a closed cell rate of 80% or more.

Assignees

• Nichias Corp

Inventors

• Oohinata Tetsuo
• Ishikawa Kenichiro
• Omura Atsushi

Classifications

• C08J9/06 Primary

  by a chemical blowing agent · CPC title

• F16J15/12

  with metal reinforcement or covering · CPC title

• C08J2205/052

  Closed cells, i.e. more than 50% of the pores are closed · CPC title

• C08J2309/00

  Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C08J7/12

  Chemical modification · CPC title