Method for producing polytetrahydrofurane having a low color...

Details Method for producing polytetrahydrofurane having a low color... Method for producing polytetrahydrofurane having a low color...

2006-12-12

2006-12-12

Dentz, Bernard (Department: 1625)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From heterocyclic reactant containing as ring atoms oxygen,...

C528S405000, C528S417000, C549S429000, C549S509000

Reexamination Certificate

active

07148318

ABSTRACT:
The invention provides a process for preparing polytetrahydrofuran, tetrahydrofuran copolymers, their monoesters or diesters and the monoesters or diesters of polytetrahydrofuran having a low color number in the presence of a catalyst, which comprises converting crude tetrahydrofuran which has been prepared in a manner per se into pure tetrahydrofuran by distillation, subsequently subjecting the latter to essentially complete hydrogenation and using the high-purity tetrahydrofuran obtained in this way for the polymerization directly after its preparation.

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