Production method of polycarbonate
US8629235B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 2013 |
| Grant date | Jan 14, 2014 |
| Priority date | — |
| Expiry date | Jul 8, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00094
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for producing a polycarbonate, comprises: continuously feeding a dihydroxy compound having a portion represented by —(—CH2—O—)— in a part of a structure thereof and a carbonic acid diester; and continuously performing polycondensation to produce a polycarbonate, wherein the method satisfies all of the conditions: (A) at least two reactor vessels connected in series are used; (B) a reaction solution reacted in a first reactor of the first vessel is continuously fed to a reactor of the second vessel; (C) the first reactor is equipped with a reflux condenser; and (D) a reflux ratio in the first reactor is from 0.01 to 10 based on a distillate volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.