Copolymers comprising polyamide blocks and polyether blocks...

Details Copolymers comprising polyamide blocks and polyether blocks... Copolymers comprising polyamide blocks and polyether blocks...

C - Chemistry, Metallurgy

08

G

C08G 69/44 (2006.01) C08G 69/40 (2006.01) C08G 81/02 (2006.01)

Patent

CA 2641932

The invention relates to a copolymer comprising polyamide blocks PA alternated with polyether blocks PE, said PA blocks being formed by homopolyamide blocks PA X.Y obtained by polycondensation of: a linear aliphatic diamine having X carbon atoms, and a carboxylic diacid having Y carbon atoms. Said copolymer is characterised in that it has improved optical properties (transmission at 460nm, 560nm and 700nm) compared with the values obtained for a PA12/PTMG copolymer with the same block size or the same stiffness characterised by bending modulus (Mpa), tensile modulus (Mpa) or Shore hardness D parameters, all measured under the same conditions.

L'invention a pour objet un copolymère comprenant des blocs polyamide PA alternant avec des blocs polyéther PE, les blocs PA étant constitués par des blocs homopolyamide PA X.Y, obtenus par polycondensation : d'une diamine aliphatique linéaire ayant X atomes de carbone ; d'un diacide carboxylique ayant Y atomes de carbone ; et ledit copolymère étant caractérisé par le fait qu'il a des propriétés optiques améliorées (transmission à 460nm, à 560nm et à 700nm) comparées aux valeurs obtenues pour un copolymère PA12/PTMG de même taille de bloc ou de même rigidité caractérisée par les paramètres de module de flexion (en Mpa) ou module de traction (en Mpa) ou dureté shore D mesurées dans les mêmes conditions.

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