Aromatic polyester polycarbonates from polyols derived from recycled polyethylene terephthalate
US4468483A · kind A · utility
27Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 1983 |
| Grant date | Aug 28, 1984 |
| Priority date | — |
| Expiry date | May 5, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/64
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A novel class of aromatic polyester polycarbonates is described. The polycarbonates are made by reacting an alkylene carbonate with an aromatic polyester polyol over a polycarbonate formation catalyst such as potassium stannate. In turn, the polyol is made by esterifying a dibasic acid waste stream with an alkylene glycol to produce a polyester polyol which is subsequently used to transesterify recycled polyethylene terephthalate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.