Production method of polycarbonate resin
US8735535B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2013 |
| Grant date | May 27, 2014 |
| Priority date | — |
| Expiry date | Sep 30, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for producing a polycarbonate resin comprises a step of performing polycondensation through a transesterification reaction in the presence of a transesterification catalyst by using a dihydroxy compound as a raw material compound and a carbonic acid diester, wherein the dihydroxy compound comprises at least an aliphatic dihydroxy compound having an etheric oxygen atom on a hydroxy group, the raw material compound comprises the specific amount of a nitrogen-containing compound, and the production method of a polycarbonate resin comprises a step of previously heating the aliphatic dihydroxy compound at the specific temperature, holding the compound in the melted state for the specific time, and then mixing the melt with a carbonic acid diester.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.