Use of a composition for the contact with supercritical media

Details Use of a composition for the contact with supercritical media Use of a composition for the contact with supercritical media

C - Chemistry, Metallurgy

08

L

C08L 77/00 (2006.01) C08L 77/06 (2006.01) C08L 77/12 (2006.01) F16L 9/147 (2006.01) F16L 11/04 (2006.01) F16L 11/06 (2006.01)

Patent

CA 2740926

A moulding composition which comprises at least 50% by weight of the following constituents: a) from 0 to 99 parts by weight of polyamide, and b) from 1 to 100 parts by weight of polyamide elastomer, selected from the group of polyetheresteramide and polyetheramide, where the total of the parts by weight is 100 and where the moulding composition comprises from 0 to 9% by weight of plasticizer, is used for the production of a moulding for contact with a supercritical medium, and preferably for the production of an inner thermoplastics layer in a flexible pipe or rigid pipe, in which a supercritical medium is conveyed. Low or zero plasticizer content eliminates any significant occurrence of problems such as increased stiffness and longitudinal shrinkage.

L'invention concerne une matière à mouler contenant pour au moins 50 % de son poids les constituants suivants : a) 0 à 99 parties pondérales de polyamide et b) 1 à 100 parties pondérales d'élastomère de polyamide choisi dans le groupe comprenant l'amide d'ester de polyéther et l'amide de polyéther, la somme des parties pondérales donnant un total de 100, et la matière à mouler contenant 0 à 9 % en poids de plastifiant. Selon l'invention, la matière à mouler est utilisée pour la réalisation d'une pièce moulée destinée au contact avec une substance supercritique, et de préférence pour la réalisation d'une couche de matière thermoplastique intérieure dans un tuyau ou un tube dans lequel est acheminée une substance supercritique. La teneur faible ou nulle en plastifiant permet aux problèmes tels que la rigidification ou le rétrécissement en longueur, de ne pas se poser de manière notable.

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