Situ determination of DPC and BPA in polycarbonate by Raman spectroscopy
US6608678B1 · kind B1 · utility
8Cited by
8References
70Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2000 |
| Grant date | Aug 19, 2003 |
| Priority date | — |
| Expiry date | Oct 18, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/65
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a method for monitoring a reaction mixture using Raman spectroscopy. In a preferred embodiment, the invention provides a method for monitoring bulk and thin film melt polycarbonate polymerization reactions. In this method, the relative and absolute concentrations of the starting materials diphenylcarbonate (DPC) and bisphenol-A (BPA) are determined. Monitoring and maintenance of optimum stoichiometry in such a reaction is critical to ensuring desired polycarbonate product quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.