Process for the purifying of polytetramethylene ether glycol or corresponding diester
US4480124A · kind A · utility
17Cited by
0References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1982 |
| Grant date | Oct 30, 1984 |
| Priority date | — |
| Expiry date | Mar 11, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/322
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The subject invention relates to a process for purifying polytetramethylene ether glycol or the corresponding diester prepared by cationic polymerization of tetrahydrofuran comprising treating said glycol or diester with hydrogen in the presence of a hydrogen catalyst. The resulting products have a low color number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.