Removal of solvent from gels of poly(hydroxybutyrate) and shaped articles formed therefrom
US4360488A · kind A · utility
37Cited by
8References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1980 |
| Grant date | Nov 23, 1982 |
| Priority date | — |
| Expiry date | Aug 4, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC12P7/625
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process of forming shaped articles comprising forming a free draining gel from a solution of poly(hydroxybutyrate) in a poor solvent under conditions which cause crystallization of the polymer and subjecting the gel to a non-random deformation process so that the associated solvent is expressed. Some residual solvent may be present and can assist in subsequent fabrication processes but the solvent may also be completely removed for such processes. The resulting products have good physical properties, after uniaxial or biaxial drawing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.