Preparation of polyoxybutylene polyoxyalkylene glycols having a narrow molecular weight distribution and a reduced content of oligomeric cyclic ethers
US4728722A · kind A · utility
22Cited by
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Key dates
| Filing date | Feb 12, 1987 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | Feb 12, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.