# US 4,394,489 A · Fluoroelastomer curatives

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- Number: US 4,394,489 A
- Document ID: US4394489A
- Status: Granted
- Kind: A
- Application number: 06/352,328
- Filed: 1982-02-25
- Granted: 1983-07-19
- Earliest claimed: 1982-02-25
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Carl A. Aufdermarsh
- Web page: https://patentgrep.com/patent/US4394489A

## CPC

- C08F 259/08: on to polymers containing fluorine
- C08K 5/57: Organo-tin compounds
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Allyl-, propargyl- and allenyl- tin curatives for fluoroelastomers with nitrile cure sites provide rapid curing combined with excellent stability in aqueous environments.

## Claims

### Claim 1

In a nitrile-substituted fluoroelastomer composition containing a curing agent, the improvement wherein the curing agent comprises about from 1 to 10 parts per 100 parts by weight of elastomer of an organotin compound having the general formula R.sub.x SnY.sub.4-x wherein x is 0-3, R is aryl of 6-10 carbon atoms or alkyl of 1-4 carbon atoms, and Y is at least one of allyl, propargyl, and allenyl.

### Claim 2 (depends on 1)

A fluoroelastomer composition of claim 1 wherein x is 3.

### Claim 3 (depends on 2)

A fluoroelastomer composition of claim 2 wherein R is aryl.

### Claim 4 (depends on 3)

A fluoroelastomer composition of claim 3 wherein R is phenyl.

### Claim 5 (depends on 1)

A fluoroelastomer composition of claim 1 wherein the fluoroelastomer is a terpolymer of tetrafluoroethylene, perfluoromethyl perfluorovinylether and a cyano-substituted perfluorovinyl ether.

### Claim 6 (depends on 1)

A fluoroelastomer composition of claim 1 wherein the curing agent comprises about from 3 to 5 parts per 100 parts of fluoroelastomer.

### Claim 7 (depends on 1)

A fluoroelastomer composition of claim 1 wherein Y is allyl.