Method for decolouring tetrahydrofuran polymers or copolymers

Details Method for decolouring tetrahydrofuran polymers or copolymers Method for decolouring tetrahydrofuran polymers or copolymers

C - Chemistry, Metallurgy

08

G

C08G 65/30 (2006.01) C08G 65/20 (2006.01)

Patent

CA 2286319

The invention relates to a method for decoloring polymers or copolymers obtained by cationic polymerisation of tetrahydrofuran or tetrahydrofuran and alkylene oxide, optionally in the presence of a telogen, wherein a) the low boiling parts are initially separated by vacuum distillation or extraction and b) the remaining polymer or copolymer is heated to a temperature of 20-150 ~C in the presence of at least one auxiliary agent selected from solid oxides and/or phyllosilicates.

L'invention concerne un procédé pour la décoloration de polymérisats ou de copolymérisats obtenus par polymérisation cationique de tétrahydrofurane ou bien de tétrahydrofurane et d'oxyde d'alkylène, éventuellement en présence d'un télogène. Dans ce procédé, a) on sépare tout d'abord éventuellement les fractions à bas point d'ébullition par distillation sous vide ou extraction et b) on chauffe à une température de 20 à 150 ·C le polymérisat ou copolymérisat restant, en présence d'au moins un adjuvant choisi parmi les oxydes solides et/ou les silicates stratifiés.

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