Polyamide-based composition for flexible pipes containing...

Details Polyamide-based composition for flexible pipes containing... Polyamide-based composition for flexible pipes containing...

2006-05-16

2006-05-16

Woodward, Ana (Department: 1711)

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

C428S035800, C524S111000, C524S113000, C524S159000, C524S168000, C524S169000, C524S284000, C524S291000, C525S178000

Reexamination Certificate

active

07045185

ABSTRACT:
A composition comprising by weight:70 to 96% of at least one polyamide chosen from PA-11, PA-12, aliphatic polyamides resulting from the condensation of an aliphatic diamine having from 6 to 12 carbon atoms and an aliphatic diacid having from 9 to 12 carbon atoms, and 11/12 copolyamides having either more than 90% of nylon-11 units or more than 90% of nylon-12 units;4 to 10% of a plasticizer;0 to 25% of an NBR or H-NBR elastomer; andthe sum of the amount of plasticizer and the amount of elastomer is between 4 and 30%;can be manufactured by melt-blending the various constituents using standard techniques for thermoplastics. The composition is particularly useful for pipes used in the operation of offshore oil and gas fields. They exhibit very good ageing resistance. They are also useful for simpler pipes in motor vehicles, these compositions withstanding the ageing caused by the temperature under the bonnet of motor vehicles and the nature of the fluids transported. Pipes which comprise at least one layer of this composition are useful for offshore uses and for simpler pipes used in motor vehicles.

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patent: 4950436 (1990-08-01), Kitami et al.
patent: 5111849 (1992-05-01), Zeh
patent: 5614683 (1997-03-01), Kranbuehl
patent: 3439312 (1985-05-01), None
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patent: 1.592.857 (1990-06-01), None

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