Preparation of polytetramethylene ether glycol using an acidic zirconia catalyst
US5149862A · kind A · utility
15Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1991 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Feb 26, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for polymerizing tetrahydrofuran to produce polytetramethylene ether glycol or ester-capped polytetramethylene ether glycol is disclosed. The reaction mass is carried out at 10.degree. to 80.degree. C. and preferably 20.degree. to 60.degree. C. In a preferred aspect of the invention, a mixture of acetic anhydride and acetic acid is present in the reaction mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.