Claims
- 1. A laminar structure comprising, and bonded together in the order specified,
- (a) a first layer, having a thickness of 0.1 to 1.5 m, comprising an elastomer which, when cured, has a volume swell no greater than 65%, as determined according to ASTM D 471, Reference Fuel C, 70 hours;
- (b) a second layer, having a thickness of 0.01 to 0.1 mm, comprising a non-elastomeric fluoropolymer which has been treated to promote adhesion; and
- (c) a third layer, having a thickness of 0.1 to 4.0 mm, comprising an elastomer.
- 2. The laminar structure of claim 1 wherein the elastomer of the first layer is selected from the group consisting of acrylonitrile butadiene rubbers having acrylonitrile contents greater than 25% by weight, copolymers of epichlorohydrin and ethylene oxide, hydrogenated acrylonitrile butadiene rubbers, and fluoroelastomers.
- 3. The laminar structure of claim 2 wherein the elastomer of the first layer is a fluoroelastomer.
- 4. The laminar structure of claim 3 wherein the fluoroelastomer is a copolymer prepared from tetrafluoroethylene, vinylidene fluoride, and hexafluoropropylene.
- 5. The laminar structure of claim 4 wherein the fluoroelastomer has a fluorine content of greater than 65% by weight.
- 6. The laminar structure of claim 1 wherein the nonelastomeric fluoropolymer is selected from the group consisting of tetrafluoroethylene homopolymers and tetrafluoroethylene copolymers.
- 7. The laminar structure of claim 6 wherein the non-elastomeric fluoropolymer is a copolymer of tetrafluoroethylene and hexafluoropropylene.
- 8. The laminar structure of claim 1 wherein the elastomer of the third layer is a non-fluorinated elastomer.
- 9. The laminar structure of claim 8 wherein the elastomer of the third layer is selected, from the group consisting of chlorosulfonated polyethylene, acrylonitrile butadiene rubber, and epichlorohydrin-ethylene oxide copolymers.
- 10. The laminar structure of claim 1 wherein the first layer has a thickness of less than 1.0 mm.
- 11. The laminar structure of claim 1 wherein the third layer has a thickness of 1.0-2.5 mm.
- 12. The laminar structure of claim 1 wherein the structure further comprises a reinforcing braiding.
- 13. The laminar structure of claim 12 wherein the reinforcing braiding is between layers (b) and (c).
- 14. The laminar structure of claim 12 wherein the reinforcing braiding is exterior to the third layer and the laminar structure comprises an additional elastomer layer adjacent to the reinforcing braiding.
- 15. The laminar structure of claim 12 wherein the reinforcing braiding is selected from at least one of polyester and polyammid.
- 16. The laminar structure of claim 1 wherein the structure is in the form of a tube or hose and the third layer is the exterior layer.
- 17. The laminar structure of claim 1 wherein the elastomers of the first and third layers are fluorinated elastomers.
Parent Case Info
This application is a continuation-in-part of U.S. patent application Ser. No. 08/150,906 filed Nov. 12, 1993, now U.S. Pat. No. 5,320,888.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4806351 |
Sugimoto et al. |
Feb 1989 |
|
5320888 |
Stevens |
Jun 1994 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
51-77771 |
Jul 1993 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Japanese Patent Publication 51 7771 Dewent Abstract of Patent Issued Jul. 20, 1993. |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
150906 |
Nov 1993 |
|