Patent · US Expired

Method for producing tetrabutyl ammonium phenolate diphenol adduct

US6177538A · kind A · utility

2Cited by

3References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Carsten Hesse · Krefeld, DE
Ursula Jansen · Krefeld, DE
Johann Rechner · Krefeld, DE

Key dates

Filing date	Dec 30, 1999
Grant date	Jan 23, 2001
Priority date	—
Expiry date	Dec 30, 2019

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/52
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a method for producing and purifying tetrabutyl ammonium phenolate diphenol adduct by reacting an alkali phenolate with tetrabutyl ammonium salts in an aqueous phase and subsequently precipitating the adduct by adding phenol.

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