Process of preparing polycarbonates using microwave
US6525109B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 13, 2001 |
| Grant date | Feb 25, 2003 |
| Priority date | — |
| Expiry date | Jul 31, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2369/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process of preparing polycarbonate, more specifically to a process of preparing polycarbonates by solid state polymerization using microwave radiation, which comprises steps of preparing polycarbonate prepolymer having a certain range of viscosity average molecular weight; converting said polycarbonate prepolymer into crystalline particles having a certain degree of crystallinity; and producing polycarbonates by solid state polymerization of said crystalline particles by applying microwave radiation, thus resulting in production of high quality polycarbonates with high molecular weight within short time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.