Method for direct measurement of polycarbonate compositions by fluorescence
US6193850A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1999 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Sep 20, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0826
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a method for directly determining the concentration of a target species, such as Fries product, in a composition comprising aromatic carbonate chain units. In an exemplary embodiment, the method includes the steps of irradiating a portion of the composition with electromagnetic radiation at an excitation wavelength sufficient to cause the target species to emit a fluorescence spectrum; detecting at least a portion of the fluorescence spectrum; and determining the concentration of the target species from the fluorescence spectrum. In addition to detecting Fries product in formed polycarbonate materials, the method can also be utilized to directly determine the concentration of a target species in parallel polycarbonate reactor systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.