Patent · US Expired

Process for the preparation of mixtures of polyamines of the polyamino-polyaryl-polymethylene type

US4259526A · kind A · utility

11Cited by

8References

9Claims

0Family size

Assignees

BAYER HEALTHCARE LLC · DE
Mobay Chemical Corporation · US

Inventors

Kenneth L. Dunlap · New Martinsville, US
Hartmut Knofel · Odenthal, DE

Key dates

Filing date	Feb 21, 1979
Grant date	Mar 31, 1981
Priority date	—
Expiry date	Feb 21, 1999

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C211/50
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The instant invention is directed to a process for the preparation of mixtures of polyamines of the polyamino-polyaryl-polymethylene type whereby the proportion or the ortho-substituted products are substantially increased. This increase is brought about by adding the acid catalyst to the aromatic amine/formaldehyde reaction mixture in two or more stages.

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