Method for the reduction of impurities in polyester resins
US5049647A · kind A · utility
53Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1988 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Dec 27, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for purifying polyethyleneterephthalate reins by contacting the resins with an atmosphere containing carbon dioxide under supercritical conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.