Process for the welding of two polyamide parts

Details Process for the welding of two polyamide parts Process for the welding of two polyamide parts

2008-07-22

2008-07-22

Sells, James (Department: 1791)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

C156S272800

Reexamination Certificate

active

10475354

ABSTRACT:
A process for the welding of two polyamide parts, both made of a polyamide composition comprising a polyamide and optionally additives, the polyamide of one part (part L) having a lower softening temperature than the polyamide of the other part (part H), and wherein the polyamide composition of part L comprises one or more viscosity increasing additives increasing the melt shear viscosity of the polyamide composition at least by 30% compared to melt shear viscosity of the polyamide (measured according to ISO 11443 (A1) standard at a shear rate of 100 s−1in a capillary rheometer with I/d =30 mm/1 mm). A good weld strength is obtained and parts with different properties can be combined. Polyamide welded objects such as corrugated tubes, bellows, containers, fuel inlet systems, air inlet manifolds and airducts, may be obtained.

REFERENCES:
patent: 6334615 (2002-01-01), Uchiyama et al.
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Chemical Abstract Service, Urabe et al., No. 126: 75910,; English abstract of JP 08 281827.
Chemical Abstract Service, Nakajima et al., No. 129: 331563; English abstrct of JP 10 292108.
Crevecoeur et al; “Chain Branching Agent and Polyamide Composition Containing the Same”; U.S. Appl. No. 10/469,797, filed Sep. 4, 2003.

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