Addition of uv absorbers to pet process for maximum yield

C - Chemistry – Metallurgy – 08 – K

Patent

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C08K 5/13 (2006.01)

Patent

CA 2530484

The present invention is a method for efficiently incorporating a UV absorber into a polyester resin. The method includes forming a reaction mixture comprising a diol component, a diacid component selected from the group consisting of dicarboxylic acids, dicarboxylic acid derivatives, and mixtures thereof, an antimony containing compound, a phosphorus containing compound, a metal containing compound, and a UV absorber. The reaction mixture is polymerized in a polycondensation reaction system. In another embodiment of the present invention, the UV absorber is added while the reaction products from one reactor are transferred to the next reactor in the polycondensation reaction system. A polyester composition having the UV absorber incorporated therein is also disclosed.

Cette invention se rapporte à un procédé permettant d'incorporer efficacement un agent d'absorption d'UV dans une résine de polyester. Ce procédé consiste à former un mélange de réaction comprenant un composant diol, un composant diacide choisi dans le groupe constitué d'acides dicarboxyliques, de dérivés d'acides dicarboxyliques et de mélanges de ceux-ci, un composé contenant de l'antimoine, un composé contenant du phosphore, un composé contenant un métal et un agent d'absorption d'UV. Le mélange de réaction est polymérisé dans un système de réaction par polycondensation. Dans un autre mode de réalisation de cette invention, l'agent d'absorption d'UV est ajouté pendant que les produits de la réaction provenant d'un réacteur sont transférés au prochain réacteur dans le système de réaction par polycondensation. Une composition de polyester à laquelle est incorporé ledit agent d'absorption d'UV est également décrite.

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