Aluminum containing polyester polymers having low...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 67/02 (2006.01) C08G 63/78 (2006.01) C08K 3/32 (2006.01) C08K 5/057 (2006.01) C08K 5/098 (2006.01)

Patent

CA 2622032

A polyester polymer composition containing polyester polymers such as polymers having repeating ethylene terephthalate units, aluminum atoms in an amount of at least 3 ppm based on the weight of the polymer, the polyester polymers having an It.V. of at least 0.72 dL/g obtained through a melt phase polymerization and a residual acetaldehyde level of 10 ppm or less. Also provided are polyester polymer compositions containing polyester polymers and : (i) aluminum atoms (ii) alkaline earth metal atoms or alkali metal atoms or alkali compound residues, and (iii) a catalyst deactivator such as a phosphorus compound. The phosphorus compound is added to the polyester melt either late in the polycondensation or upon remelting a solid polyester polymer. The polyester polymer exhibits good L* brightness, clarity, and low levels of acetaldehyde generated upon melting.

Composition de polymères de polyesters contenant des polymères de polyesters du type à unités répétées de téréphtalate d'éthylène, des atomes d'aluminium en quantité d'au moins 3 ppm par rapport au poids de polymère, ces polymères ayant une It.V. d'au moins 0,72 dL/g suite à une polymérisation en phase fondue et un niveau d'acétaldéhyde résiduel inférieur ou égal à 10 ppm. On décrit aussi des compositions de polymères de polyesters contenant des polymères de polyesters et : (i) des atomes d'aluminium (ii) des atomes de métaux alcalino-terreux ou alcalins ou des résidus de composés alcalins, et (iii) un désactivateur catalytique du type composé phosphoreux, lequel est ajouté au fondu de polyesters tardivement dans la polycondensation ou à la refusion des polymères de polyesters solides. Les polymères de polyesters décrits présentent une bonne luminosité L*, une bonne clarté et de faibles taux de production d'acétaldéhyde à la fusion.

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