Pressurized fluid conduit
View Patent ↗A pressurized fluid conduit includes a mono-layer of a semi-crystalline thermoplastic material that has a hardness of between 50 and 65 Shore D and a modulus at 150° C. of at least 60 MPa. The semi-crystalline thermoplastic material may be used for making a mono-layered pressurized fluid conduit via an extrusion molding process, such as an extrusion blow-molding process.
1. Pressurized fluid conduit comprising a mono-layer of a semi-crystalline thermoplastic material having a hardness of between 50 and 65 Shore D and a modulus at 150° C. of at least 60 MPa, as measured with DMS on a test-sample dynamically elongated at 1 Hz, following ASTM D5026.
2. Pressurized fluid conduit according to claim 1 , wherein the thermoplastic material has a hardness of between 52 and 63 Shore D.
3. Pressurized fluid conduit according to claim 1 , wherein the thermoplastic material has a modulus at 160° C. of at least 60 MPa.
4. Pressurized fluid conduit according to claim 1 , wherein the conduit is an extrusion blow-moulded part and the thermoplastic material displays a melt viscosity, as measured at 240° C. and at shear rate 1 s −1 , of between 9 and 30 kPa·s.
5. Pressurized fluid conduit according to any claim 1 , wherein the conduit comprises at least one section with wall geometries, like corrugations or convolutes, which affect deflection of the conduit.
6. Pressurized fluid conduit according to claim 1 , wherein the conduit is an automobile air-duct.
7. Pressurized fluid conduit according to claim 1 , wherein the thermoplastic material is a block copolyester.
8. Pressurized fluid conduit according to claim 7 , wherein the block copolyester is a block copolyether ester.
9. Pressurized fluid conduit according to claim 7 , wherein the block copolyester contains polybutylene terephthalate as hard blocks.
10. Pressurized fluid conduit according to claim 8 , wherein the block copolyether ester contains a poly(propylene oxide)diol.
11. Pressurized fluid conduit according to claim 8 , wherein the block copolyether ester contains polybutylene terephthalate as hard blocks and a poly(propylene oxide)diol, optionally ethylene oxide-terminated, as soft blocks.
12. A process for making mono-layered pressurized fluid conduit comprising extrusion molding a semi-crystalline thermoplastic material with a hardness of between 50 and 65 Shore D and a modulus at 150° C. of at least 60 MPa, as measured with DMS on a test-sample dynamically elongated at 1 Hz, following ASTM D5026, for making into a mono-layered pressurized fluid conduit via an extrusion moulding process.
13. A process according to claim 12 , wherein the thermoplastic material has a hardness of between 52 and 63 Shore D.
14. Process according to claim 12 , wherein the conduit is an automobile air-duct.
15. A process according to claim 12 , wherein the thermoplastic material has a modulus at 160° C. of at least 60 MPa.
16. A process according to claim 12 , wherein the thermoplastic material displays a melt viscosity, as measured at 240° C. and at shear rate 1 s −1 , of between 9 and 30 kPa·s and wherein the fluid conduit part is extrusion blow molded.
17. A pressurized automobile air duct produced by the method of claim 12 .
18. Process for making a mono-layered pressurized fluid conduit comprising extrusion blow moulding of a thermoplastic material, wherein the thermoplastic material comprises a block copolyester with a hardness of between 50 and 65 Shore D and a modulus at 150° C. of at least 60 MPa, as measured with DMS on a test-sample dynamically elongated at 1 Hz following ASTM D5026, is applied as thermoplastic material.
19. Process according to claim 18 , wherein the block copolyester has a hardness of between 52 and 63 Shore D.
20. Process according to claim 18 , wherein the conduit is an automobile air-duct.
21. A process according to claim 18 , wherein the block copolyester is a block copolyether ester.
22. A process according to claim 21 , wherein the block copolyether ester contains polybutylene terephthalate as hard blocks and a poly(propylene oxide)diol, optionally ethylene oxide-terminated, as soft blocks.
23. A process according to claim 18 , wherein the block copolyether contains polybutylene terephthalate as hard blocks.
24. A process according to claim 18 , wherein the block copolyether ester contains a poly(propylene oxide)diol.
25. A process according to claim 18 , wherein the block copolyether has a modulus at 160° C. of at least 60 MPa.
26. A process according to claim 18 , wherein the block copolyester displays a melt viscosity, as measured at 240° C. and at shear rate 1 s −1 , of between 9 and 30 kPa·s.
27. A pressurized automobile air duct produced by the method of claim 18 .