Process for producing pet articles with low acetaldehyde

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 63/88 (2006.01) C08L 67/02 (2006.01)

Patent

CA 2269930

The present invention discloses a process for producing molded, shaped or extruded articles comprising the steps of: a) melt reacting, in the presence of a catalyst which is substantially free of Co compounds, at least one glycol and at least one dicarboxylic acid to form a polyester having an I.V. of at least about 0.5 dL/g, wherein said at least one glycol is selected from the group consisting of glycols having up to 10 carbon atoms and mixtures thereof and said dicarboxylic is selected from the group consisting of alkyl dicarboxylic acids having 2 to 16 carbon atoms, aryl dicarboxylic acids having 8 to 16 carbon atoms and mixtures thereof; b) adding an acetaldehyde reducing additive to said polyester to form a reduced acetaldehyde polyester; and c) forming said reduced acetaldehyde polyester into articles directly from step b. Thus, the present invention provides a process for directly producing from the melt article having extremely low acetaldehyde content.

Cette invention a trait à un procédé de production d'articles moulés, façonnés ou extrudés comportant les étapes suivantes: (a), réaction à l'état fondu, en présence d'un catalyseur quasiment exempt de composés de Co, d'au moins un glycol et d'au moins un acide dicarboxylique afin d'obtenir un polyester d'un indice logarithmique de viscosité d'au moins approximativement 0,5 dL/g. Le glycol est choisi dans le groupe constitué de glycols comportant jusqu'à 10 atomes de carbone et de leurs mélanges tandis que l'acide dicarboxylique est choisi dans le groupe constitué d'acides alkyle dicarboxyliques comportant de 2 à 16 atomes de carbone, d'acides aryle dicarboxyliques comportant de 2 à 16 atomes de carbone et de leurs mélanges, (b), adjonction d'un produit d'addition d'acétaldéhyde réducteur audit polyester pour former un polyester à faible teneur en acétaldéhyde et (c), mise en forme directe de ce polyester à faible teneur en acétaldéhyde en articles. Cette invention porte, de la sorte, sur un procédé de production directe à partir de l'article fondu d'une teneur en acétaldéhyde extrêmement faible.

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