Method for producing polytetrahydrofuran

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

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Reexamination Certificate

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07074944

ABSTRACT:
In a process for the single-stage preparation of polytetrahydrofuran and/or tetrahydrofuran copolymers having a mean molecular weight of from 650 to 5000 dalton by polymerization of tetrahydrofuran over an acid catalyst in the presence of at least one telogen and/or comonomer, the telogen and/or comonomer is added at at least two addition points in different segments of the polymerization apparatus.

REFERENCES:
patent: 5886138 (1999-03-01), Mueller
patent: 6362312 (2002-03-01), Eller et al.
patent: 99/36459 (1999-07-01), None
Tanabe et al,Studies in Surface Sci. and Catalysis, vol. 51, 108-128, 1989.
Tanabe et al.Studes in Surface Sci. and Catalysis vol. 51, 199-210, 1989.

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