Method for producing tetrahydrofuran copolymers

Details Method for producing tetrahydrofuran copolymers Method for producing tetrahydrofuran copolymers

2008-04-22

2008-04-22

Price, Elvis O. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S619000, C568S620000

Reexamination Certificate

active

07361793

ABSTRACT:
The present invention relates to a process for the single-stage preparation of polyoxyalkylene glycols by copolymerization of THF and alpha, omega-diols in the presence of a heteropolyacid, wherein the content of organically bound nitrogen in the alpha, omega-diol is less than 15 ppm.

REFERENCES:
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patent: 0181621 (1986-05-01), None
patent: 1004610 (2000-05-01), None
patent: 1361243 (2003-11-01), None
F. Ehrenberger, Qnatitative Organische Elementaranalyse, 1991, Kap. 37, p. 382-384.
Z. Chemie, 17. (1977), pp. 353-357.
Z. Chemie 19 (1979) pp. 308-309.
International Search Report.

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