Alloy composition useful for fluid transport objects
AssigneeArkema Inc.
InventorsMehdi Emad, Franck Bertoux, Thibaut Montanari
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Abstract
The present invention relates to a novel polyamide alloy composition that is useful for forming objects that may be used for the storage and transport of fluids. The polyamide alloy is a blend of at least one polyamide and at least one modified polyolefin having both medium to hard and soft domains. The polyamide forms the continuous phase of the alloy. The alloy may also contain, and preferably does contain, a thermal and light stabilization compound, at least one unmodified polyolefin, and at least one plasticizer. The polyamide alloy composition is useful in forming tanks, hoses and tubes used in the transport of liquid or gaseous fluids, including fluids under pressure.
Claims12
A multilayer structure for fluid transport and/or storage comprising as the inner layer, or outer layer a blend of:
- a) 60-90 percent by weight of one or more polyamides as the continuous phase;
- b) 10 to 30 percent by weight of one or more unmodified high density polyethylene (HDPE) having a flexural modulus of from 700 Mpas to 1600 Mpas;
- c) 8-20 percent by weight of one or more modified polyolefins in the disperse phase having two distinct domains, one having a flexural modulus of less than or equal to 100 Mpa (soft) and/or is an elastomer, the other having a flexural modulus of 200 Mpa to 400 Mpa (medium) and a density of 0.915 to 0.925, wherein said medium and soft domains of said modified polyolefin are present on the same modified polyolefin;
- d) 4-10 percent by weight of one or more plasticizers chosen from benzene sulfonamide derivatives;
- and
- e) 0.8-1.5 percent by weight of one or more stabilization compounds, wherein the structure is, in said polyamide continuous phase, a hard HDPE core and satellites at the periphery made of the modified polyolefin having medium and soft domains that are discontinuous;
- and the inner or outer layer not comprised of said blend comprising PA 11 or PA 12.
Dependencies are inferred from the claim text.