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

• US 6,274,665 B2
• Filed: 12/18/2000
• Issued: 08/14/2001
• Est. Priority Date: 10/31/1997
• Status: Expired due to Fees

• Current Assignee: NOK Corporation
• Original Assignee: NOK Corporation
• Inventors: Kobayashi, Osamu, Ohta, Takashi, Minagawa, Hironori, Ono, Shigeyuki, Tokumitsu, Hideyuki
• Primary Examiner(s): Cain, Edward J.
• Application Number:
  US09/737,744
• Publication Number:
  US 20010000788A1
• Time in Patent Office: 239 Days
• Field of Search: 524/493, 524/496
• US Class Current: 524/493
• 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 method of preparing a molded sealing composition for sealing against permeation of carbon dioxide gas, comprising the steps of:

(1) preparing a molding composition comprising a fluoro thermoplastic elastomer and a reinforcing filler having a particle size of not more than 100 nm;

(2) molding said molding composition to obtain a vulcanized rubber composition; and

(3) contacting said vulcanized rubber composition with carbon dioxide gas have carbon dioxide as a majority component to separate an air side from a carbon dioxide gas side.

2. The method of preparing a molded sealing composition for sealing against permeation of carbon dioxide gas according to claim 1, wherein said molding composition further comprises a non-reinforcing filler.

3. The method of preparing a molded sealing composition for sealing against permeation of carbon dioxide gas according to claim 1, wherein said molding composition further comprises an organic peroxide crosslinking agent.

4. The method of preparing a molded sealing composition for sealing against permeation of carbon dioxide gas according to claim 1, wherein said molding composition further comprises an organic solvent.

5. The method of preparing a molded sealing composition for sealing against permeation of carbon dioxide gas according to claim 1, wherein an amount of said reinforcing filler used in said molding composition is in the range of about 5 to 100 phr based on 100 phr of said fluoro thermoplastic elastomer.

6. The method of preparing a molded sealing composition for sealing against permeation of carbon dioxide gas according to claim 1, wherein said vulcanized rubber composition is in a form of an oil seal.

7. The method of preparing a molded sealing composition for sealing against permeation of carbon dioxide gas according to claim 1, wherein said vulcanized rubber composition is in a form of a hose or tube.

8. The method of preparing a molded sealing composition for sealing against permeation of carbon dioxide gas according to claim 1, wherein said vulcanized rubber composition is in a form of a diaphragm.