Method for determining degradation of thermoplastics
US9921145B2 · kind B2 · utility
1Cited by
8References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 4, 2016 |
| Grant date | Mar 20, 2018 |
| Priority date | — |
| Expiry date | Nov 4, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/442
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of determining degradation of a thermoplastic when exposed to light and heat includes illuminating the thermoplastic with a desired wavelength of light at a desired irradiance while maintaining the ambient air surrounding the thermoplastic at a desired temperature. The method is useful to measure the discoloration rate of transparent, translucent and opaque thermoplastics such as polycarbonates, the discoloration rate being determined by transmission or reflectance spectra of transmitted or reflected white light through or from the thermoplastic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.