Patent · US Active

Process for the preparation of di- and polyamines of the diphenylmethane series

US8399701B2 · kind B2 · utility

0Cited by

2References

11Claims

0Family size

Assignee

HUNTSMAN INTERNATIONAL LLC · US

Inventors

Robert Henry Carr · Oud-Heverlee, BE
Peter Muller · Leverkusen, DE
Rabah Mouazer · Wavre, BE

Key dates

Filing date	May 16, 2008
Grant date	Mar 19, 2013
Priority date	—
Expiry date	Jul 11, 2029

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C263/10
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a process for the preparation of di- and polyamines of the diphenylmethane series, and to the preparation of di- and polyisocyanates of the diphenylmethane series from these di- and polyamines. The di- and polyamines of the diphenylmethane series are prepared by the reaction of aniline and formaldehyde in the presence of hydrochloric acid. In the present invention, the formaldehyde employed is used as an aqueous solution which contains less than 0.001 wt % of metal ions which are divalent and/or more than divalent.

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