# US 4,400,482 A · Novel fluoroelastomer film compositions containing silane compounds and method for the preparation thereof

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- Number: US 4,400,482 A
- Document ID: US4400482A
- Status: Granted
- Kind: A
- Application number: 06/359,361
- Filed: 1982-03-18
- Granted: 1983-08-23
- Earliest claimed: 1980-08-18
- Assignees: David Hudson, Inc.
- Inventors: Donald Close
- Web page: https://patentgrep.com/patent/US4400482A

## CPC

- C08K 5/54: Silicon-containing compounds {(C08K5/0091 takes precedence)}
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The invention herein disclosed provides a method for preparing improved fluoroelastomer film compositions including the steps of dissolving a fluoroelastomer gum selected from the group consisting of copolymers of vinylidene fluoride and hexafluoropropylene, and terpolymers of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene in a solvent, adding a silane compound to the gum solution and curing the fluoroelastomer gum with a silane in the absence of metallic oxides. A method is also provided for adhering fluoroelastomer film compositions, devoid of metallic oxides, to substrates which includes the steps of dissolving the fluoroelastomer gum in a solvent, adding a silane compound to the gum solution, coating the substrate with the fluoroelastomer gum-silane solution, evaporating the solvent and leaving a film firmly adhered to the substrate. Another method includes the steps of first coating a substrate with a silane compound, then applying a fluoroelastomer gum solution over the silane coated substrate, evaporating the solvent and leaving a film firmly adhered to the substrate. The fluoroelastomer film compositions disclosed herein are also novel and can be used to coat a variety of substrates thereby providing other novel, useful articles.

## Claims

### Claim 1

A method for preparing fluoroelastomer film composition solutions including the steps of:
dissolving a fluoroelastomer gum in a solvent; and
adding a silane compound to said gum solution said silane compound having the formula RCH.sub.2 CH.sub.2 CH.sub.2 SiR'.sub.3-n (OR").sub.n, where R is an organofunctional group selected from the group consisting of amine and epoxy molecules; R' is a simple alkyl group having about one to five carbon atoms; OR" is a hydrolyzable alkoxy group, R" being an alkyl group having about one to four carbon atoms and n is 1, 2 or 3; with the proviso that said fluoroelastomer gum and -silane solution be devoid of metallic oxide.

### Claim 2

A method for adhering fluoroelastomer film compositions, devoid of metallic oxides, to substrates comprising the steps of:
dissolving a fluoroelastomer gum in a solvent; and
adding a silane compound to said gum solution said silane compound having the formula RCH.sub.2 CH.sub.2 CH.sub.2 SiR'.sub.3-n (OR").sub.n, where R is an organofunctional group selected from the group consisting of amine and epoxy molecules; R' is a simple alkyl group having about one to five carbon atoms; OR" is a hydrolyzable alkoxy group, R" being an alkyl group having about one to four carbon atoms and n is 1, 2 or 3;
coating said substrate with said fluoroelastomer gum-silane solution; and
evaporating said solvent and leaving a film firmly adhered to said substrate.

### Claim 3 (depends on 1, 2)

A method, as set forth in claims 1 or 2, wherein said silane compound is H.sub.2 N(CH.sub.2).sub.2 HN(CH.sub.2).sub.3 Si(OCH.sub.3).sub.3.

### Claim 4 (depends on 1, 2)

A method, as set forth in claims 1 or 2, wherein said silane compound is ##STR3##

### Claim 5 (depends on 1, 2)

A method, as set forth in claims 1 or 2, wherein the amount of silane compound employed ranges from about 0.1 to about 10 parts per 100 parts of rubber.

### Claim 6

A novel fluoroelastomer film composition comprising:
a fluoroelastomer gum; and
a silane compound having the formula RCH.sub.2 CH.sub.2 CH.sub.2 SiR'.sub.3-n (OR").sub.n, where R is an organofunctional group selected from the group consisting of amine and epoxy molecules; R' is a simple alkyl group having about one to five carbon atoms; OR" is a hydrolyzable alkoxy group, R" being an alkyl group having about one to four carbon atoms and n is 1, 2 or 3.

### Claim 7 (depends on 6)

A novel fluoroelastomer film composition, as set forth in claim 6, wherein said silane compound is H.sub.2 N(CH.sub.2).sub.2 HN(CH.sub.2).sub.3 Si(OCH.sub.3).sub.3.

### Claim 8 (depends on 6)

A novel fluoroelastomer film composition, as set forth in claim 6, wherein said silane compound is ##STR4##

### Claim 9 (depends on 6)

A novel fluoroelastomer film composition, as set forth in claim 6, wherein the amount of silane compound employed ranges from about 0.1 to about 10 parts per 100 parts of fluoroelastomer.

### Claim 10

A novel fluoroelastomer solution comprising:
a fluoroelastomer gum;
a silane compound having the formula RCH.sub.2 CH.sub.2 CH.sub.2 SiR'.sub.3-n (OR").sub.n, where R is an organofunctional group selected from the group consisting of amine and epoxy molecules; R' is a simple alkyl group having about one to five carbon atoms; OR" is a hydrolyzable alkoxy group, R" being an alkyl group having about one to four carbon atoms and n is 1, 2 or 3; and
a solvent for said fluoroelastomer and gum solution.

### Claim 11 (depends on 10)

A novel fluoroelastomer solution, as set forth in claim 10, wherein said silane compound is H.sub.2 N(CH.sub.2).sub.2 HN(CH.sub.2).sub.3 Si(OCH.sub.3).sub.3.

### Claim 12 (depends on 10)

A novel fluoroelastomer solution, as set forth in claim 10, wherein said silane compound is ##STR5##

### Claim 13 (depends on 10)

A novel fluoroelastomer solution, as set forth in claim 10, wherein the amount of silane compound employed ranges from about 0.1 to about 10 parts per 100 parts of fluoroelastomer.