Patent ID: 6197979
Filing Date: 2001-03-06
Classification: B01J,C08G

Abstract:
A process for preparing polytetrahydrofuran or polytetrahydrofuran modified by at least one telogen and/or comonomer and having a low color number by polymerization of tetrahydrofuran in the presence ofi at least one telogen and/or comonomerii with a heterogeneous catalyst, with the exception of (a) acid-activated and calcined zeolites or kaolin, (b) synthetic amorphous aluminum silicates and (c) supported catalysts comprising an oxidic support material and a catalytically active amount of a tungsten or molybdenum compound or mixtures thereofiii wherein the polymerization is carried out in the presence of molecular hydrogen and wherein the telogen and/or comonomer is a carboxylic acid anhydride, a monocarboxylic acid, a 1,2-alkylene oxide, a dialcohol, a low molecular weight polytetrahydrofuran, water, 2-methyltetrahydrofuran or 3-methyltetrahydrofuran.