Method of preparing a molded sealing composition for sealing against permeation of carbon dioxide gas

• US 20010000788A1
• Filed: 12/18/2000
• Published: 05/03/2001
• Est. Priority Date: 10/31/1997
• Status: Active Grant

• Current Assignee: NOK Corporation
• Original Assignee: NOK Corporation
• Inventors: Kobayashi, Osamu, Ohta, Takashi, Minagawa, Hironori, Ono, Shigeyuki, Tokumitsu, Hideyuki
• Granted Patent: US 6,274,665 B2
• Time in Patent Office: Days
• US Class Current: 524/544
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08L 27/12 containing fluorine atoms

Abstract

An object of the present invention is to provide a molding composition having an excellent properties to seal carbon dioxide. The composition is made of fluoro thermoplastic elastomer having a reinforcing filler such as carbon black or white carbon having a particle diameter of not more than 100 nm. The composition can be used as a sealing materials such as O-ring, oil seal, gasket, hose, tube or diaphragm for sealing carbon dioxide.

Claims

1. A molding composition for sealing carbon dioxide comprising a fluoro thermoplastic elastomer and a filler having a particle size of not more than 100 nm.

2. A molding composition for sealing carbon dioxide according to

claim 1

, wherein said filler comprises a reinforcing filler.

3. A molding composition for sealing carbon dioxide according to

claim 1

, wherein said filler comprises a non-reinforcing filer.

4. A molding composition for sealing carbon dioxide according to

claim 1

, further comprising an organic peroxide crosslinking agent.

5. A molding composition for sealing carbon dioxide according to

claim 1

, further comprising an organic solvent.

6. A molded sealing composition for sealing carbon dioxide made of the molding composition according to

claim 1

.

7. A hose or tube for sealing carbon dioxide made from a molding composition according to

claim 1

.

8. A diaphragm for sealing carbon dioxide made from a molding composition according to

claim 1

.

10. A molded sealing composition for sealing carbon dioxide according to

claim 8

, wherein at least one kind of monomer unit is copolymerized in both the fluoro rubber and the fluoro thermoplastic elastomer.

11. A molded sealing composition for sealing carbon dioxide according to

claim 8

, wherein a volume ratio of fluoro thermoplastic elastomer in the molded sealing composition is in the range of about 0.1 to 0.9.

12. A molded sealing composition for sealing carbon dioxide according to

claim 8

, wherein a reinforcing filler having a particle size of not more than 100 nm is used in the molded sealing composition.

13. A molded sealing composition for sealing carbon dioxide according to

claim 8

, wherein the molded sealing composition is used as a part of a sealing device which is used for sealing between relatively movable portions on one of which the sealing device is held and at least a part of the molded sealing composition made of the fluoro thermoplastic elastomer composition is sealingly contacted with another relatively movable portion.

9. A molded sealing composition for sealing carbon dioxide comprising a fluoro thermoplastic ealstomer and fluoro rubber, wherein a surface of the fluoro rubber is covered by the fluoro thermoplastic elastomer.

14. A sealing device for sealing carbon dioxide comprising;

a fluoro rubber, and

a fluoro thermoplastic elastomer comprising a fluoro thermoplastic elasomer and a reinforcing filler having a particle diameter of not more than 100 nm, wherein a portion of a carbon dioxide side of the sealing device is made of the fluoro thermoplastic elasomer and at least one of a surface of the sealing portion which sealingly contacts with a portion to be sealed is covered by the fluoro thermoplastic elasomer which covers the fluoro rubber.

15. A sealing device for sealing carbon dioxide according to

claim 14

, wherein the sealing device is used for an oil seal.