Preparation of polyoxybutylene polyoxyalkylene glycols having a

Details Preparation of polyoxybutylene polyoxyalkylene glycols having a Preparation of polyoxybutylene polyoxyalkylene glycols having a

1987-02-12

1988-03-01

Nielsen, Earl

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

Synthetic resins

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

528416, 528417, 568617, 568624, C08G 6520

Patent

active

047287225

ABSTRACT:
A process for the batchwise preparation of polyoxybutylene polyoxyalkylene glycols by copolymerizing tetrahydrofuran with a 1,2-alkylene oxide in the presence of compounds containing reactive hydrogen, the polymerization being carried out over a bleaching earth catalyst or zeolite catalyst, and the 1,2-alkylene oxide being fed to the reaction mixture in such manner that the concentration of the 1,2-alkylene oxide in the reaction mixture is kept at below 2% by weight during the polymerization.

REFERENCES:
patent: 4228272 (1980-10-01), Del Pesco
patent: 4251654 (1981-02-01), Robinson et al.
patent: 4303782 (1981-12-01), McHale et al.
patent: 4306058 (1981-12-01), Copelin
patent: 4329445 (1982-05-01), Del Pesco
patent: 4500705 (1985-02-01), Copelin
patent: 4564671 (1986-01-01), Mueller
patent: 4585592 (1986-04-01), Mueller

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