Patent · US Expired

Process for the production of aliphatic-aromatic polycarbonates

US5408027A · kind A · utility

2Cited by

13References

9Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Wilfried Haese · Rheydt, DE
Ralf Pakull · Krefeld, DE
Gerhard Fennhoff · Willich, DE
Jurgen Kirsch · Cologne, DE

Key dates

Filing date	Feb 24, 1994
Grant date	Apr 18, 1995
Priority date	—
Expiry date	Feb 24, 2014

Classification

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

Abstract

A process for producing an aliphatic-aromatic polycarbonate is disclosed. The process comprise (A) reacting in an anhydrous neutral solvent (i) an oligocarbonate of diphenol with (ii) an aliphatic dicarboxylic acid, and (B) eliminating the hydrogen chloride and carbon dioxide by-products. The oligocarbonate of diphenol is characterized in that it is terminated by chlorocarbonic acid ester groups. The resins thus prepared are readily molded conventionally.

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