Process for producing magnetic fluid

Details Process for producing magnetic fluid Process for producing magnetic fluid

1991-12-18

1993-08-31

Willis, Jr., Prince

Compositions

Magnetic

Iron-oxygen compound containing

252 6251, 252 6252, 427216, 427220, C01G 4908, C04B 3526

Patent

active

052406288

ABSTRACT:
A magnetic fluid is produced by adding a solution of N-polyalkylenepolyamine-substituted alkenylsuccinimide in a hydrocarbon solvent to an aqueous suspension of fine particles of ferrites, thereby adsorbing the N-polyalkylenepolyamine-substituted alkenylsuccinimide onto the fine particles of ferrites, distilling off water and the hydrocarbon solvent therefrom, and dispersing the fine particles of N-polyalkylenepolyamine-substituted alkenylsuccinimide-adsorbed magnetites as residues into a base oil of low vapor pressure having a vapor pressure of not more than 0.1 mmHg at 25.degree. C.

REFERENCES:
patent: Re32573 (1988-01-01), Furumura
patent: 3531413 (1970-09-01), Rosensweig
patent: 4019994 (1977-04-01), Kelley
patent: 4956113 (1990-09-01), Kanno
patent: 4976883 (1990-12-01), Kanno et al.
patent: 5064550 (1991-11-01), Wyman
Smalheer & Smith, "Lubricant Additives", 1967 pp. 4-5.

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