Polyterephthalates and copolymers thereof having high clarity and process for making same
US4447595A · kind A · utility
44Cited by
4References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1982 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Sep 7, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/87
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to polyethylene terephthalate and copolymers thereof having high clarity and process for making the same. The invention provides a process for making PET using protonic acid catalysts which result in a polymer having a level of haze which is lower than has heretofore been attainable, using conventional metallic catalysts. Further, the polyesters so produced have a lower melt temperature which improves the processability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.