Multilayered composite polyamide articles and processes for...

Details Multilayered composite polyamide articles and processes for... Multilayered composite polyamide articles and processes for...

2006-10-17

2006-10-17

Pyon, Harold (Department: 1772)

Stock material or miscellaneous articles

Composite

Of polyamide

C428S034100, C428S035700, C428S035900, C428S036900, C428S036910, C428S474400, C428S474700

Reexamination Certificate

active

07122255

ABSTRACT:
Multilayered polyamide composite articles comprising at least three layers that comprise aliphatic and semi-aromatic polyamides and that is better able to retain its mechanical properties at high temperatures and over long times are disclosed. Layers comprising aliphatic polyamides may optionally contain oxidation stabilizers. The articles may be in the form of tubes incorporated into a heat exchanger. Processes for their preparation are also provided.

REFERENCES:
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patent: 5258213 (1993-11-01), Mugge et al.
patent: 5425817 (1995-06-01), Mugge et al.
patent: 6989198 (2006-01-01), Masuda et al.
patent: 530 538 (1997-05-01), None
patent: WO 98/10927 (1998-03-01), None
patent: WO 98/11398 (1998-03-01), None
patent: WO 02-29347 (2002-04-01), None
Derwent Abstract, EP 470605, EMS Inventa AG, “Polyamide Pipe, Especially . . . Glass Fibre-Reinforced”.

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