Patent · US Expired

Process for generating a vacuum in production of polycarbonate

US5576414A · kind A · utility

2Cited by

3References

8Claims

0Family size

Assignee

Zimmer, Inc. · US

Inventors

Fritz Wilhelm · Karben, DE
Rudolf Kaempf · Zöblitz, DE
Walter W. Wenzel · Roßdorf, DE
Klaus Mackensen · Frankfurt am Main, DE

Key dates

Filing date	Oct 5, 1995
Grant date	Nov 19, 1996
Priority date	—
Expiry date	Oct 5, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G64/20
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Process for generating a vacuum and separating the condensable components of the vapors of melt-phase polycondensation in the production of polycarbonate, where at least one or two vapor jets with a downstream spray condenser are connected to the intake side of the polycondensation reactor to be evacuated, and the motive vapor is diphenyl carbonate vapor, and the spray liquid is liquid diphenyl carbonate.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.