Process for preparing aromatic polycarbonate
US5840826A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1997 |
| Grant date | Nov 24, 1998 |
| Priority date | — |
| Expiry date | Sep 19, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/307
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a method for producing an aromatic polycarbonate which comprises subjecting to a transesterification reaction in a polymerizer at least one polymerizable material selected from a molten monomer mixture of an aromatic dihydroxy compound and a diaryl carbonate, and a molten prepolymer obtained from the monomer mixture, wherein a liquid mass of polymerizable material being transesterified in the polymerizer has an exposed surface, and wherein the transesterification reaction of the liquid mass of polymerizable material is performed under reaction conditions such that the following formula (1) is satisfied: EQU log (S/V).gtoreq.2.times.10.sup.-5 .times.Mn+0.8 (1) wherein S represents an evaporation surface area (m.sup.2) which is defined as the area (m.sup.2) of the exposed surface of the liquid mass of polymerizable material; V represents the volume (m.sup.3) of the liquid mass of polymerizable material in the polymerizer; and Mn represents the number average molecular weight of the aromatic polycarbonate to be produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.