High i.v. polyester compositions containing platelet particles

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 7/00 (2006.01) C08G 63/80 (2006.01) C08K 3/34 (2006.01) C08K 9/04 (2006.01) C08L 67/02 (2006.01)

Patent

CA 2276393

The present invention relates to polyester-platelet particle composite compositions comprising about 0.01 to about 25 weight percent platelet particles dispersed in at least one polyester wherein said composition has an I.V. of greater than about 0.55 dl/g, low shear melt viscosity greater than about 30,000 poise and a gas permeability which is at least 10 % lower than that of unmodified polyester. The platelet particles are preferably derived from chemically modified or synthetic clays and have a thickness of less than 2 nm and a diameter between 10 to 2000 nm. The high viscosity filled polyester composition is prepared by polycondensing a polyester-platelet particle precomposition in the solid state.

La présente invention concerne des compositions composites de polyester contenant des particules en plaquettes. Lesdites compositions contiennent entre environ 0,01 et environ 25 % en masse de particules en plaquettes dispersées dans au moins un polyester, une telle composition étant dotée d'un indice logarithmique de viscosité supérieur à environ 0,55 dl/g, d'une viscosité à l'état fondu de cisaillement faible et supérieure à environ 30 poises, enfin, d'une perméabilité aux gaz qui est au moins inférieure de 10 % à celle du polyester ordinaire. Les particules en plaquettes sont de préférence obtenues à partir d'argiles chimiquement modifiées ou synthétiques et ont une épaisseur inférieure à 2 nm et un diamètre situé entre 10 et 2000 nm. La composition polyester renforcée de viscosité élevée est préparée par polycondensation d'une composition préalable de polyester à particules en plaquettes, à l'état solide.

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