Method for preparing polyether glycols
US4127513A · kind A · utility
23Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1977 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | Nov 9, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The production of undesirable oligomeric cyclic ethers in the preparation of polyether glycols is reduced by using as a catalyst an acid-activated montmorillonite clay which contains, per gram, 0.1 to 0.9 milliequivalent of hydrogen ions having pK.sub.a values of -3 to -8.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.