# US 8,785,563 B2 · Cross-linkable fluoroelastomer excellent in cross-linkability and method for its production

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- Number: US 8,785,563 B2
- Document ID: US8785563B2
- Status: Granted
- Kind: B2
- Application number: 12/754,650
- Filed: 2010-04-06
- Published: 2010-08-05
- Granted: 2014-07-22
- Earliest claimed: 2007-11-20
- Assignees: Asahi Glass Company, Limited
- Applicants: Masahide Yodogawa; Masayuki Saito
- Inventors: Masahide Yodogawa; Masayuki Saito
- Web page: https://patentgrep.com/patent/US8785563B2

## CPC

- C08J 3/244: {Stepwise homogeneous crosslinking of one polymer with one crosslinking system, e.g. partial curing}
- C08K 5/04: Oxygen-containing compounds {(C08K5/0091 takes precedence)}
- C08K 5/098: Metal salts of carboxylic acids
- C08K 5/14: Peroxides
- C08K 5/20: Carboxylic acid amides
- H01B 3/28: natural or synthetic rubbers
- H01B 3/445: {from vinylfluorides or other fluoroethylenic compounds}
- C08J 2327/12: containing fluorine atoms
- C08J 2327/18: Homopolymers or copolymers of tetrafluoroethylene
- Y10T 428/296: Rubber, cellulosic or silicic material in coating
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A cross-linkable fluoroelastomer remarkably excellent in cross-linkability and a method for its production, a fluoroelastomer composition excellent in the cross-linked physical properties, and a cross-linked rubber. A cross-linkable fluoroelastomer having a Mooney viscosity of from 20 to 300, obtainable by heat-treating a mixture of a fluoroelastomer (A), an organic peroxide (B) and at least one additive (C) selected from the group consisting of a C12-28 higher fatty acid, a metal salt of a C12-28 higher fatty acid, an ester of a C12-28 higher fatty acid, an amide of a C12-28 higher fatty acid and a C12-28 higher aliphatic alcohol, at a temperature of from 110 to 380° C.

## Claims

### Claim 1

A method for producing a cross-linkable fluoroelastomer, which comprises heat-treating a mixture of a fluoroelastomer (A), an organic peroxide (B) and at least one additive (C) selected from the group consisting of a C12-28 higher fatty acid, a metal salt of a C12-28 higher fatty acid, an ester of a C12-28 higher fatty acid, and an amide of a C12-28 higher fatty acid and a C12-28 higher aliphatic alcohol, at a temperature of from 110 to 380° C. to produce said cross-linkable fluoroelastomer, wherein the cross-linkable fluoroelastomer has an absorption peak at from 1640 to 1700 cm−1, wherein the peak intensity of the absorption at from 1640 to 1700 cm−1 of the infrared absorption spectrum as represented by absorbance of a hot pressed sample having a thickness of 0.2 mm is from 0.05 to 1.5, and wherein the fluoroelastomer (A) has no absorption peak at from 1640 to 1700 cm−1.

### Claim 2 (depends on 1)

The method for producing a cross-linkable fluoroelastomer according to claim 1, wherein the cross-linkable fluoroelastomer produced has a Mooney viscosity of from 20 to 300.

### Claim 3 (depends on 1)

The method for producing a cross-linkable fluoroelastomer according to claim 1, wherein the additive (C) is a C12-28 higher fatty acid and/or its metal salt.

### Claim 4 (depends on 1)

The method for producing a cross-linkable fluoroelastomer according to claim 1, wherein the blend ratio of fluoroelastomer (A)/organic peroxide (B)/additive (C) in the mixture is 100/0.1 to 10/0.1 to 10 (mass ratio).

### Claim 5 (depends on 1)

The method for producing a cross-linkable fluoroelastomer according to claim 1, wherein the fluoroelastomer (A) is a tetrafluoroethylene/propylene copolymer.

### Claim 6 (depends on 1)

The method for producing a cross-linkable fluoroelastomer according to claim 1, wherein the temperature for half life of one minute of the organic peroxide (B) is from 110 to 200° C.

### Claim 7 (depends on 1)

The method for producing a cross-linkable fluoroelastomer according to claim 1, which comprises kneading and heat-treating a mixture of a fluoroelastomer (A), an organic peroxide (B) and at least one additive (C) selected from the group consisting of a C12-28 higher fatty acid, a metal salt of a C12-28 higher fatty acid, an ester of a C12-28 higher fatty acid, an amide of a C12-28 higher fatty acid and a C12-28 higher aliphatic alcohol, at a temperature of from 110 to 380° C. by means of an extruder.

### Claim 8 (depends on 1)

The method according to claim 1, further comprising mixing the cross-linkable fluoroelastomer with a vulcanizer (D) and a vulcanization assistant (E) to produce a cross-linkable fluoroelastomer composition.

### Claim 9 (depends on 8)

The method according to claim 8, further comprising cross-linking the cross-linkable fluoroelastomer composition.

### Claim 10 (depends on 9)

The method according to claim 9, wherein said crosslinking is accomplished by applying an ionizing radiation to the cross-linkable fluoroelastomer composition.

### Claim 11 (depends on 1)

The method for producing a cross-linkable fluoroelastomer according to claim 1, wherein the cross-linkable fluoroelastomer produced has a Mooney viscosity of from 30 to 200.

### Claim 12 (depends on 11)

The method for producing a cross-linkable fluoroelastomer according to claim 11, wherein fluoroelastomer (A) has no carbon-carbon unsaturated bonds.

### Claim 13 (depends on 12)

The method for producing a cross-linkable fluoroelastomer according to claim 12, wherein the fluoroelastomer (A) is a tetrafluoroethylene/propylene copolymer.

### Claim 14 (depends on 1)

The method for producing a cross-linkable fluoroelastomer according to claim 1, wherein fluoroelastomer (A) has no carbon-carbon unsaturated bonds.