# US 2014/0155551 A1 · Peroxide curable fluoroelastomer compositions

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- Number: US 2014/0155551 A1
- Document ID: US20140155551A1
- Status: Published application
- Kind: A1
- Application number: 13/692,109
- Filed: 2012-12-03
- Published: 2014-06-05
- Earliest claimed: 2012-12-03
- Assignees: E. I. Du Pont de Nemours and Company
- Applicants: E I Du Pont De Nemours and Company
- Inventors: STEVEN R. ORIANI
- Web page: https://patentgrep.com/patent/US20140155551A1

## CPC

- C08L 27/16: Homopolymers or copolymers or vinylidene fluoride
- C08K 5/14: Peroxides
- C08L 77/00: Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Disclosed herein is a curable composition comprising a peroxide curable fluoroelastomer, an organic peroxide, a multifunctional coagent and a polyamide. Such curable compositions cure to a high degree in a short time.

## Claims

### Claim 1

A curable fluoroelastomer composition comprising:
A) a peroxide curable fluoroelastomer;
B) an organic peroxide;
C) a multifunctional coagent; and
D) 0.5 wt % to 30 wt % polyamide, based on total weight of fluoroelastomer and polyamide.

### Claim 2 (depends on 1)

The curable composition of claim 1 wherein said fluoroelastomer is a copolymer of vinylidene fluoride and hexafluoropropylene, said copolymer having iodine or bromine cure sites.

### Claim 3 (depends on 2)

The curable composition of claim 2 wherein said copolymer further comprises tetrafluoroethylene.

### Claim 4 (depends on 3)

The curable composition of claim 3 wherein said copolymer contains less than 50 wt % vinylidene fluoride.

### Claim 5 (depends on 4)

The curable composition of claim 4 wherein said copolymer contains less than 40 wt % vinylidene fluoride.

### Claim 6 (depends on 1)

The curable composition of claim 1 wherein said polyamide has a melting peak temperature greater than 160° C.

### Claim 7 (depends on 6)

The curable composition of claim 6 wherein said polyamide has a melting peak temperature greater than 180° C.

### Claim 8 (depends on 7)

The curable composition of claim 7 wherein said polyamide has a melting peak temperature greater than 200° C.

### Claim 9 (depends on 1)

The curable composition of claim 1 substantially free from a metal oxide.

### Claim 10

A process for preparing a curable fluoroelastomer composition comprising the steps of
A) providing a peroxide curable fluoroelastomer;
B) providing a polyamide having a melting peak temperature or a glass transition temperature;
C) mixing said peroxide curable fluoroelastomer with said polyamide at a temperature greater than the melting peak temperature or glass transition temperature of the polyamide, whichever temperature is greater, to form a polymer blend comprising peroxide curable fluoroelastomer and 0.5 wt % to 30 wt % polyamide, based on total weight of fluoroelastomer and polyamide;
D) cooling the polymer blend to solidify the polyamide; and
E) adding a peroxide curative and a multifunctional coagent to said polymer blend at a temperature less than the melting peak temperature or glass transition temperature of the polyamide, whichever is less, to form a curable fluoroelastomer composition.

### Claim 11 (depends on 10)

The process for preparing a curable fluoroelastomer composition of claim 10 wherein said fluoroelastomer is a copolymer of vinylidene fluoride and hexafluoropropylene, said copolymer having iodine or bromine cure sites.

### Claim 12 (depends on 11)

The process for preparing a curable fluoroelastomer composition of claim 11 wherein said copolymer further comprises tetrafluoroethylene.

### Claim 13 (depends on 10)

The process for preparing a curable fluoroelastomer composition of claim 10 wherein said polyamide has a melting peak temperature greater than 160° C.

### Claim 14 (depends on 13)

The process for preparing a curable fluoroelastomer composition of claim 13 wherein said polyamide has a melting peak temperature greater than 180° C.

### Claim 15 (depends on 14)

The process for preparing a curable fluoroelastomer composition of claim 14 wherein said polyamide has a melting peak temperature greater than 200° C.