Patent · US Expired

Two stage process for the production of aromatic polyester-carbonate

US4600753A · kind A · utility

4Cited by

3References

7Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Dieter Freitag · Krefeld, DE
Claus Wulff · Krefeld, DE
Gerhard Henes · Leverkusen, DE
Ludwig Bottenbruch · Krefeld, DE
Peter Tacke · Krefeld, DE

Key dates

Filing date	Dec 10, 1984
Grant date	Jul 15, 1986
Priority date	—
Expiry date	Dec 10, 2004

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/64
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a process for the preparation of aromatic polyester-carbonates wherein, in a first stage, aromatic oligo-esters or oligo-ester-carbonates having hydroxyl end groups are prepared from diaryl esters of aromatic dicarboxylic acids (or their starting materials) and diphenols and, optionally, a diaryl carbonate, by trans-esterification in the melt, and in a second stage these oligo-esters or oligo-ester-carbonates are condensed with phosgene by the phase boundary process to give the polyester-carbonate.

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