Articles comprising a polyolefin-based element joined to a poluamide-based element, and process for obtaining them
AssigneeRhodia Engineering Plastics S.r.l.
InventorNicolangelo Peduto
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Abstract
The invention concerns manufactured articles comprising at least two assembled thermoplastic elements, a first element based on polyolefin and a second element based on polyamide. The elements are assembled by being welded together.
Claims20
An article comprising at least two elements made of thermoplastics which are joined together, a first element being formed from a material based on a polyolefin and a second element being formed from a material comprising a polyamide, characterized in that the material of the second element is a composition comprising at least one polyamide and a compatibilizer for polyamides and polyolefins, and in that the assembly operation is carried out by welding the two elements together over at least a portion of the surfaces of the latter.
The article as claimed in one of the preceding claims, characterized in that the polyamide is chosen from nylon-6, nylon-11, nylon-12, nylon-4,6, nylon-6,10, nylon-6,6, nylon-6,10, nylon-6,36, copolymers and blends based on these polyamides.
The article as claimed in one of the preceding claims, characterized in that the composition has a melt flow index of between 0.5 g/10 min and 8 g/10 min, measured under a load of 5 kg at a temperature of 275° C.
The article as claimed in one of the preceding claims, characterized in that the polyolefin is chosen from polyethylenes, polypropylenes, copolymers and blends based on these polymers.
The article as claimed in one of the preceding claims, characterized in that the elements are obtained by forming using a technique chosen from injection molding, extrusion blow molding, gas injection molding and water injection molding.
The article as claimed in one of the preceding claims, characterized in that the two elements are hollow, assembled by the complementarity of the shapes so that the hollow portions of each of the elements communicate with each other.
A process for manufacturing articles as claimed in one of the preceding claims, by forming elements made of a thermoplastic and then joining them together, characterized in that the assembly operation is carried out by bringing the elements into contact with each other over at least a portion of their surfaces and then welding the two parts over at least a portion where the two elements are in contact, at a temperature above the softening point of the materials constituting the elements.
Dependencies are inferred from the claim text.