Preparation of polytetrahydrofuran or tetrahydrofuran/alkylene o

Details Preparation of polytetrahydrofuran or tetrahydrofuran/alkylene o Preparation of polytetrahydrofuran or tetrahydrofuran/alkylene o

1994-06-30

1995-10-31

Krass, Frederick

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

Synthetic resins

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

568617, 560 82, 560 90, 560 91, 560 93, 560112, 560200, 560240, C08G 6520, C08G 6510

Patent

active

054630207

ABSTRACT:
Polytetrahydrofuran or C.sub.2 -C.sub.10 -alkylene oxide/tetrahydrofuran copolymers having a molecular weight of from 250 to 20,000 Dalton are prepared by the cationic polymerization of tetrahydrofuran or tetrahydrofuran and C.sub.2 -C.sub.10 -alkylene oxides in the prsence of a promoter by a process in which the catalyst used is a mixture of one or more C.sub.2 -C.sub.6 -di- or tricarboxylic acids with boric acid.

REFERENCES:
patent: 2499725 (1948-02-01), Copelin
patent: 2782233 (1957-02-01), Muetterties
patent: 3358042 (1967-12-01), Dunlop et al.
patent: 4189566 (1980-02-01), Mueller et al.
patent: 4259531 (1981-03-01), Huchler et al.
patent: 5034423 (1991-07-01), Blount
Derwent abstract, JP-A 58,204,026.
Angew. Chem. vol. 72 (1960) p. 927.

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