Document Type and Number:
Japanese Patent JPS5168531
Kind Code:
A
Abstract:
Primary amines and polyhydroxy aromatic compounds are condensed in the presence of iron halide catalysts to produce diamine antioxidants. Iron is known to accelerate oxidative degradation. Its presence in an antioxidant composition is therefore undesirable. Dry calcium hydroxide is added to the diamine reaction mixture to precipitate the iron. The precipitate is then filtered from the reaction mixture.
Inventors:
UIRIAMU ESU HORINGUSUHETSUDO
Application Number:
JP13028675A
Publication Date:
June 14, 1976
Filing Date:
October 29, 1975
Export Citation:
Assignee:
GOODYEAR TIRE & RUBBER
International Classes:
C07B61/00; B01J27/00; C07C67/00; C07C209/00; C07C209/18; C07C211/51; (IPC1-7): B01J27/08; C07C85/06; C07C87/50