Novel use of a copolymer comprising polyamide blocks and...

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B01D 71/56 (2006.01) C08G 69/44 (2006.01) C08G 81/02 (2006.01)

Patent

CA 2642439

The invention relates to a copolymer comprising polyamide blocks and polyether blocks having general formula (I) -[PA - PE]n- , wherein: PA represents a polyamide block, PE represents a polyether block, and n represents the number of -PA-PE- units in said copolymer. The aforementioned blocks originate either entirely from polytrimethylene ether glycol (PO3G) or from a mixture or a copolymer of PO3G and at least one of the following: polyethylene ether glycol (PEG), polypropylene ether glycol (PPG), polytetramethylene ether glycol (PTMG), polyhexamethylene ether glycol and the copolymers of tetrahydrofurane (THF) and 3-alkyl tetrahydrofurane (3MeTHF). The invention relates to the use of said copolymer as: a breathable-waterproof product or an additive conferring breathable-waterproof properties on thermoplastic polymers in order to form a membrane with selective diffusion as a function of the type of gas; and an additive for polyamide 6, polyamide 6.6 or copolyamide 6/6.6, which is intended to be transformed into a film in order to improve the mechanical properties and/or the processability of the polyamide.

L'invention a pour objet l'utilisation d'un copolymère comprenant des blocs polyamide et des blocs polyéther de formule générale (I) -[PA - PE]n- dans laquelle - PA représente un bloc polyamide ; PE représente un bloc polyéther, et - n représente le nombre d'unités -PA-PE- dudit copolymère, et dans laquelle - lesdits blocs proviennent soit entièrement du polytriméthylène éther glycol (PO3G) ou alors proviennent d'un mélange ou d'un copolymère de PO3G et d'au moins l'un parmi le polyéthylène éther glycol (PEG) , le polypropylène éther glycol (PPG) , le polytétraméthylène éther glycol (PTMG) , le polyhexaméthylène éther glycol et les copolymères de tétrahydrofuranne (THF) et de 3-alkyl tétrahydrofuranne (3MeTHF) ; comme produit imper-respirant ou comme additif conférant des propriétés d' imper-respirabilité à des polymères thermoplastiques pour constituer une membrane de diffusion sélective en fonction de la nature du gaz ; comme additif à du polyamide 6, du polyamide 6.6 ou du copolyamide sur base 6/6.6 destiné à être transformé en un film pour améliorer les propriétés mécaniques et/ou l'aptitude à la transformation dudit polyamide.

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