Electroconductive magnetic fluid composition and process for pro

Details Electroconductive magnetic fluid composition and process for pro Electroconductive magnetic fluid composition and process for pro

1990-04-26

1992-08-04

Straub, Gary P.

Compositions

Magnetic

Flaw detection or magnetic clutch

252 74, 252519, H01F 128, H01B 106

Patent

active

051356724

ABSTRACT:
An electroconductive magnetic fluid composition is disclosed comprising a low volatility organic solvent as a carrier, a surface active agent having an lipophilic group with a strong affinity for the solvent, fine ferromagnetic particles coated at the surface thereof with the surface active agent and dispersed in the organic solvent, and a tertiary amine and an organic acid as an electrifying agent. The electroconductive magnetic fluid composition of the present invention is produced, preferably, including the steps of admixing fine ferromagnetic particles, a low boiling point organic solvent an surface active agent and separating to remove any fine particles of poor dispersibility.

REFERENCES:
patent: Re32573 (1988-01-01), Furumura et al.
patent: 4315827 (1982-02-01), Bottenberg et al.
patent: 4356098 (1982-10-01), Chagnon
patent: 4604222 (1986-08-01), Bordoz et al.
patent: 4604229 (1986-08-01), Raj et al.
patent: 4613520 (1986-09-01), Dasgupta
patent: 4673997 (1987-06-01), Gowda et al.
patent: 4867910 (1989-09-01), Meguro et al.

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