Patent · US Expired

Storage of phosphonium phenolate catalysts and their use as interesterification catalysts

US6747118B2 · kind B2 · utility

0Cited by

6References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Melanie Moethrath · Goldkronach, DE
Uwe Hucks · Alpen, DE
Silke Kratschmer · Krefeld, DE
Johann Rechner · Krefeld, DE

Key dates

Filing date	Apr 5, 2003
Grant date	Jun 8, 2004
Priority date	—
Expiry date	Apr 5, 2023

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J2231/49
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing a melt transesterification catalyst is disclosed. The process entails (i) obtaining a phenol adduct of phosphonium phenolatein the form of crystalline solid and (ii) storing the solid phenol adductin a closed container at relative humidity of 30 to 70 % and at temperature of −30 to 50° C. The thus prepared catalyst is suitable in the production of polycarbonate in the melt transesterification process.

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