process for the polymerization of tetrahydrofuran or alkyl substituted tetrahydrofuran to poly (glycol with estereindgroepen, tetramethyleenether)process for the preparation of poly (tetramethyleenether) glycol from the thus prepared poly (tetramethyleenether) glycolester and shaped productsmanufactured by applying the thus prepared poly (tetramethyleenether) glycol or ester thereof.