Process for production of propylene oxide/ethylene oxide block copolymers
US6022945A · kind A · utility
3Cited by
1References
1Claims
0Family size
Assignee
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Key dates
| Filing date | May 28, 1999 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | May 28, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/2675
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A catalyst for the polymerization of an alkylene oxide compound is disclosed. This catalyst is composed of a phosphazene compound or a phosphazenium salt which is derived from the phosphazene compound and an active hydrogen compound. A poly(alkylene oxide) can be efficiently produced by polymerizing the alkylene oxide compound in the presence of the catalyst and, when the catalyst is composed of the phosphazene compound, the active hydrogen compound. The poly(alkylene oxide) contains no metal component and compared with those produced using conventional amine-base catalysts, has also been improved significantly in odor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.