Branched polycarbonate preforms, blow moldable polycarbonate and method for making
US5597887A · kind A · utility
12Cited by
3References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1995 |
| Grant date | Jan 28, 1997 |
| Priority date | — |
| Expiry date | Aug 9, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Blow moldable polycarbonate is produced by first producing a polycarbonate preform by a melt transesterification process. The polycarbonate preform comprises 2.1 to 10 mole percent polyfunctional branching agent, based on the total moles of polycarbonate in the polycarbonate preform. The polycarbonate preform is then melt equilibrated with a second polycarbonate to produce a blow moldable grade.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.