Polyester compositions of low residual aldehyde content

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 67/02 (2006.01) C08K 5/053 (2006.01)

Patent

CA 2376152

A mixture of a polyester, such as poly(ethylene terephthalate) PET, and a second polymer which is selected from the group consisting of poly(vinyl alcohol), ethylene/vinyl alcohol copolymer and a suitable polyhydric alcohol when extrusion compounded exhibits a lower residual acetaldehyde content than does PET alone when similarly treated. The invention pertains to any polyester used in the manufacture of bottles or containers which in turn are used to store consumer materials, especially food, beverages and most especially water.

L'invention concerne un mélange constitué d'un polyester, tel que poly(éthylène téréphthalate) ou PET, et d'un second polymère sélectionné dans le groupe comprenant l'alcool polyvinylique, le copolymère éthylène/alcool de vinyle et un polyol approprié, lequel mélange, préparé par compoundage par extrusion, présente une teneur résiduelle en acétaldéhyde inférieure à celle d'un PET ayant subi un traitement similaire. L'invention porte sur n'importe quel polyester utilisé dans la fabrication de bouteilles ou de récipients, qui sont utilisés à leur tour, pour le stockage de produits de consommation, notamment les produits alimentaires, les boissons, tout particulièrement l'eau.

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