Polyester composition and polyester packaging material...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 67/02 (2006.01) C08L 77/00 (2006.01)

Patent

CA 2488409

The present invention relates to a polyester composition excellent in transparency, thermal stability, and flavor retention or excellent in transparency, thermal stability, flavor retention and gas barrier properties, which is obtained by blending a partially aromatic polyamide to a thermoplastic polyester, and also relates to a packaging material comprising the same. The polyester composition of the invention preferably contains an alkali metal atom in an amount of 0.1 to 300 ppm and phosphorus atom in an amount of 5 to 200 ppm. Further, it is preferable that the Color-L value of the molded article obtained by injection molding of the polyester composition of the invention at a molding temperature of 290°C is 80.0 or more and the haze thereof is 20% or less. As the partially aromatic polyamide, an m-xylylene group-containing polyamide is preferable.

La présente invention concerne une composition polyester qui comprend 100 parties en poids d'un polyester thermoplastique et de 0,1 à 50 parties en poids d'un polyamide partiellement aromatique, la composition polyester possédant une teneur en atomes de métal alcalin comprise entre 0,1 et 300 ppm et possédant de préférence une teneur en atomes de phosphore de 5 à 200 ppm, laquelle composition permet en outre, de préférence, d'obtenir un produit moulé possédant une valeur couleur L supérieure ou égale à 80,0 par moulage par injection à 290·C et possédant un trouble inférieur ou égal à 20%. L'invention se rapporte également à une matière d'emballage en polyester renfermant la composition polyester de l'invention. Le polyamide partiellement aromatique est de préférence un polyamide contenant un groupe métaxylylène. La composition polyester de l'invention permet d'obtenir un produit formé possédant d'excellentes propriétés de transparence, de stabilité thermique, de conservation de parfum et de barrière aux gaz.

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