Apparatus for manufacturing polycarbonate
US6204352A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1999 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/205
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
To provide a manufacturing apparatus with which it is possible to manufacture a polycarbonate that has superior residence stability such as its coloring stability and thermal stability during melt molding, and that has a low content of foreign matter. An apparatus for manufacturing a polycarbonate by the melt polycondensation of a bisphenol and a carbonic diester, wherein said apparatus for manufacturing a polycarbonate is characterized in that: PA1 (1) the equipment surfaces that come into contact with the molten raw materials and the reaction product thereof at 250.degree. C. or lower are made of nickel; and PA1 (2) the equipment surfaces that come into contact with the molten raw materials and the reaction product thereof above 250.degree. C. are made of stainless steel with a nickel content of 5 to 15% and a chromium content of 10 to 20%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.