Process for the preparation of crystalline poly(ethylene terephthalate)
US5104965A · kind A · utility
25Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1991 |
| Grant date | Apr 14, 1992 |
| Priority date | — |
| Expiry date | Feb 22, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/88
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing a crystalline poly(ethylene terephthalate) having an inherent viscosity of at least 0.5 comprising PA0 (A) preparing an admixture of molten poly(ethylene terephthalate) and a zeolite, and PA0 (B) cooling the admixture at a rate less than about 300 degrees C. per minute to a temperature less than about 80 degrees C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.