# US 4,394,205 A · Method for vulcanization bonding of fluorine-containing elastomers to vulcanized natural and synthetic elastomers

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- Number: US 4,394,205 A
- Document ID: US4394205A
- Status: Granted
- Kind: A
- Application number: 06/358,162
- Filed: 1982-03-15
- Granted: 1983-07-19
- Earliest claimed: 1982-03-15
- Assignees: Lord Corporation
- Inventors: Donald R. Blenner
- Web page: https://patentgrep.com/patent/US4394205A

## CPC

- C08J 7/126: {Halogenation}
- C08J 5/124: {using adhesives based on a macromolecular component}
- C08J 2321/00: Characterised by the use of unspecified rubbers
- C08J 2327/12: containing fluorine atoms
- Y10T 428/31536: Including interfacial reaction product of adjacent layers
- Y10T 428/3154: Of fluorinated addition polymer from unsaturated monomers
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for bonding unvulcanized fluorinated elastomers to vulcanized non-fluorinated elastomers comprising exposing the vulcanized elastomer to a fluorinating agent; applying a conventional fluorinate elastomer adhesive to the treated vulcanized elastomer; contacting the adhesive-coated portion of the vulcanized elastomer with the unvulcanized fluorinated elastomer; and curing in situ the fluorinated elastomer. Sulfur tetrafluoride is a preferred fluorinating agent.

## Claims

### Claim 1

A method for bonding an unvulcanized fluorinated elastomer to a previously vulcanized non-fluorinated elastomer, wherein saud unvulcanized elastomer is cured in situ against said vulcanized elastomer, said method comprising:
exposing at least one surface of said vulcanized elastomer to a fluorine-containing compound selected from the group consisting of sulfur tetrafluoride, boron trifluoride and phosphorus pentafluoride;
coating at least a portion of said at least one surface which has been exposed to said fluorine-containing compound with (a fluorinated elastomeric) an adhesive for fluorinated elastomers;
applying to the adhesive-coated portion of said at least one surface an unvulcanized fluorinated elastomer composition; and
curing said unvulcanized fluorinated elastomer composition.

### Claim 2 (depends on 1)

A method according to claim 1 wherein said fluorine-containing compound comprises sulfur tetrafluoride.

### Claim 3 (depends on 2)

A method according to claim 2 wherein said fluorinated elastomer comprises vinylidene fluoride-hexafluoropropylene copolymer elastomer.