Claims
- 1. A composite tubular article substantially resistant to separation comprising (a) at least an outer sheathing of a vulcanized elastomer containing carboxylic acid or dicarboxylic acid anhydride functional groups, used directly in combination with (b) a binder tube of thermoplastic elastomer containing polyamide blocks, and optionally (c) an inner sealing layer.
- 2. The composite tubular article of claim 1, wherein said (b) binder tube of thermoplastic elastomer comprises a polyetheresteramide containing polyamide blocks.
- 3. The composite tubular article of claim 1, wherein said outer sheathing is vulcanized by a system chosen from the group consisting of a sulphur system, a sulphur donating system, a phenolic resin system, and a peroxide system.
- 4. The composite tubular article of claim 1, wherein said (a) at least one outer sheathing of a vulcanized elastomer containing carboxylic acid or dicarboxylic acid anhydride functional groups comprises carboxylated nitrile elastomer, acrylic elastomer, carboxylated polybutadiene, grafted ethylene/propylene/diene terpolymer, polybutadiene, ethylene/propylene/diene terpolymer, hydrogenated nitrile rubber (HNBR), epichlorohydrin rubber ##STR2## optionally containing at least one member of the group consisting of ethylene oxide units --(--CH.sub.2 --CH.sub.2 --O--)-- or vinyl acetate units, or mixtures of vulcanized elastomers.
- 5. The composite tubular article of claim 1, wherein said (c) inner sealing layer comprises a material selected from the group consisting of polyamide 6, polyamide 66, polyamide 11, polyamide 12, copolymers thereof, and blends of the polyamides with polyolefins, polyvinylidene fluoride or other thermoplastic polymers.
- 6. The composite tubular article of claim 1, further comprising one or more intermediate layers between said (c) inner sealing layer and said (b) binder tube of thermoplastic elastomer containing polyamide blocks.
- 7. The composite tubular article of claim 1, wherein said (a) at least one outer sheathing of a vulcanized elastomer containing carboxylic acid or dicarboxylic acid anhydride functional groups has a permanent compression set at 100.degree. C. which is lower than 50%.
- 8. The composite tubular article of claim 1, wherein said (b) binder tube of thermoplastic elastomer containing polyamide blocks has a melting point of between 120.degree. C. and 210.degree. C.
- 9. The composite tubular article of claim 1, wherein said (a) at least one outer sheathing of a vulcanized elastomer containing carboxylic acid or dicarboxylic acid anhydride functional groups has a peel strength of at least 2 daN/cm.
- 10. The composite tubular article of claim 1, wherein said (a) at least one outer sheathing of a vulcanized elastomer containing carboxylic acid or dicarboxylic acid anhydride functional groups comprises carboxylic acid or dicarboxylic acid anhydride present at a concentration of between 0.3% and 10% relative to the weight of said outer sheathing.
- 11. The composite tubular article of claim 1, wherein said (a) at least one outer sheathing of a vulcanized elastomer containing carboxylic acid or dicarboxylic acid anhydride functional groups further comprises at least one filler present at a concentration of between 5 and 100 parts by weight per 100 parts of (a).
- 12. The composite tubular article of claim 1, wherein said (b) binder tube of thermoplastic elastomer containing polyamide blocks comprises a polyether containing polyamide blocks.
- 13. The composite tubular article of claim 1, wherein said (b) binder tube of thermoplastic elastomer containing polyamide blocks has a Vicat point between 100.degree. C. and 200.degree. C.
- 14. The composite tubular article of claim 1, wherein said (b) binder tube of thermoplastic elastomer containing polyamide blocks has a Vicat point between 130.degree. C. and 175.degree. C.
- 15. The composite tubular article of claim 1 wherein at least one outer sheathing of a vulcanized elastomer containing carboxylic acid or dicarboxylic acid anhydride functional groups comprises an acrylic elastomer and a diamine crosslinking system.
- 16. A process for the preparation of a composite tubular article, comprising (a) sheathing a binder tube of thermoplastic elastomer containing polyamide blocks by extrusion at an appropriate temperature with at least one outer sheath of a vulcanizable elastomer comprising carboxylic acid or dicarboxylic acid anhydride functional groups, a crosslinking system and, optionally, various adjuvants and fillers, and (b) vulcanizing said sheath.
- 17. The process for the preparation of the composite tubular article of claim 16, wherein said vulcanizing is completed at a temperature between -5.degree. C. and +30.degree. C. relative to a vicat point of said thermoplastic elastomer containing polyamide blocks.
- 18. The process for the preparation of the composite tubular article of claim 16, wherein said vulcanizing is completed in 15 minutes or less.
- 19. The process for the preparation of the composite tubular article of claim 16, wherein said vulcanizable elastomer is extruded at a temperature of between 50.degree. C. and 120.degree. C. into a sheathing die in which there is present a thermoplastic tube.
- 20. The process for the preparation of the composite tubular article of claim 16, wherein said vulcanizing is completed in a vulcanization autoclave for rubber that uses hot air and infrared radiation to achieve vulcanization.
- 21. The process for the preparation of the composite tubular article of claim 16, wherein the binder tube of thermoplastic elastomer containing polyamide blocks further comprises at least one filler present in an amount between 5 and 100 parts by weight per 100 parts of thermoplastic elastomer.
- 22. The process for the preparation of the composite tubular article of claim 17, wherein the vulcanization temperature is about at the Vicat point of the thermoplastic elastomer containing polyamide blocks.
- 23. The process for the preparation of the composite tubular article of claim 16, wherein said vulcanizing has a t.sub.90 of 15 minutes or less.
- 24. The process for the preparation of the composite tubular article of claim 16, wherein said vulcanizing has a t.sub.90 of between 5 minutes and 10 minutes.
- 25. The process for the preparation of the composite tubular article of claim 16, wherein said vulcanizing yields a torque increase of 0.3 Nm in between 4 minutes and 6 minutes.
- 26. The process for the preparation of the composite tubular article of claim 16, wherein said binder tube of thermoplastic elastomer containing polyamide blocks further comprises an inner protective layer wherein the inner protective layer comprises a polyamide with a melting point higher than 220.degree. C.
- 27. The process for the preparation of the composite tubular article of claim 26, wherein said inner protective layer comprises polyamide 6 or polyamide 66.
- 28. The process for the preparation of the composite tubular article of claim 16, wherein said vulcanizing is carried out continuously by placing a UHF oven in line with a sheathing extruder.
Priority Claims (1)
Number |
Date |
Country |
Kind |
93 00226 |
Jan 1993 |
FRX |
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Parent Case Info
This is a continuation of application Ser. No. 08/180,384, filed Jan. 12, 1994, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4950436 |
Kitami |
Aug 1990 |
|
5132182 |
Grosse-Puppendahl et al. |
Jul 1992 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
3439312 |
May 1985 |
DEX |
3914011 |
Nov 1989 |
DEX |
4026161 |
Feb 1991 |
DEX |
4132123 |
Apr 1992 |
DEX |
Non-Patent Literature Citations (4)
Entry |
Derwent Abstract of Japanese Patent No. 2,217,863. |
Derwent Abstract of Japanese Patent No. 4,086,258. |
Patent Abstracts of Japan Abstract of Japanese Patent No. 2,217,863. |
Patent Abstracts of Japan Abstract of Japanese Patent No. 4,086,258. |
Continuations (1)
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Number |
Date |
Country |
Parent |
180384 |
Jan 1994 |
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