Eliminating acetaldehyde from crystalline polyethylene terephthalate resin
US4230819A · kind A · utility
16Cited by
2References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1979 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Apr 13, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/90
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to the removal of acetaldehyde from crystalline polyethylene terephthalate granules by passing a dry inert gas through a bed of resin at a temperature of 170.degree. C. to 250.degree. C. for a time sufficient to remove the aldehydes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.