Patent · US Active

Process for the preparation of 3,3,4-trimethylcyclohexylidene bisphenol (BP-TMC)

US11225451B2 · kind B2 · utility

0Cited by

2References

20Claims

0Family size

Assignee

Covestro Intellectual Property GmbH & Co. KG · DE

Inventors

Johan Vanden Eynde · Zwijnaarde, BE
Kristof Heylen · Hechtel-Eksel, BE
Anja Ehrig · Leverkusen, DE
Lars Frye · Leichlingen, DE

Key dates

Filing date	Nov 13, 2019
Grant date	Jan 18, 2022
Priority date	—
Expiry date	Nov 13, 2039

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C2601/14
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present inventions relates to the preparation of 3,3,5-trimethylcyclohexylidene bisphenol. Especially, the present invention relates to the preparation of 3,3,5-trimethylcyclohexylidene bisphenol from 3,3,5-trimethylcyclohexanone and phenol in the presence of a gaseous acidic catalyst. The preparation comprises a first drying step and a second drying step wherein in the second drying step the temperature is increased in comparison to first drying step or in the second drying step the pressure is lowered in comparison to first drying step, or in second drying step both the temperature is increased and the pressure is lowered in comparison to the first drying step (d1).

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