Hydroxy-terminated polyhydroxyalkanoates
US6156852A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1998 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Jun 12, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2230/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Hydroxyterminated PHA is produced by cultivating a PHA-producing microorganism in the presence of an aliphatic diol or an aliphatic polyol. High molecular weight hydroxy-terminated PHA is obtainable by the disclosed process, and is useful in the production of graft, block and random polymers and copolymers with other monomers, oligomers and polymers containing appropriate functionality and end group compatibility. The hydroxyterminated PHAs of the invention display improved thermal stability compared with PHAs not modified to contain increased end-group hydroxyl content. In addition, a branched PHA structure is provided by melt processing polyol terminated PHA.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.