Preparation of polytetramethylene ether glycol diesters having a low color number
US4803299A · kind A · utility
13Cited by
7References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 6, 1987 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Apr 6, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polytetramethylene ether glycol diesters having a low color number are prepared by catalytic polymerization of tetrahydrofuran in the presence of a carboxylic anhydride, a bleaching earth and from 2 to 0.2% by weight, based on the tetrahydrofuran, of an alkylene oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.