Patent · US Expired

Trisphenol process

US4059638A · kind A · utility

3Cited by

4References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Heinrich Krimm · Krefeld, DE
Erhard Tresper · Krefeld, DE

Key dates

Filing date	Feb 24, 1976
Grant date	Nov 22, 1977
Priority date	—
Expiry date	Feb 24, 1996

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/3215
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

New trisphenols and their preparation by reacting the diacyl compound of dimeric p-isopropenylphenol or of a polycarbonate with a phenol in the presence of a strong acid catalyst at temperatures between -20.degree. and 30.degree. C.

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