Distillation of polycyclic diol
US6632331B2 · kind B2 · utility
2Cited by
10References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2001 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Jul 26, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/3212
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Aldehyde compounds contained in polycyclic diols as impurities are effectively removed by distilling the polycyclic diols in the presence of an alkali metal compound and/or a alkaline earth compound. The distilled polycyclic diols are useful as a diol component of a polymer such as polycarbonate with less yellowing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.