Compositions – Magnetic – Iron-oxygen compound containing
Patent
1988-03-14
1989-05-30
Pianalto, Bernard
Compositions
Magnetic
Iron-oxygen compound containing
252 6251, 427127, C01G 4908, C04B 3526
Patent
active
048348988
ABSTRACT:
Particles of a nonmagnetic material are rendered magnetic by contacting their surfaces with a magnetizing reagent comprising water containing particles of a magnetic material, each of which has a two layer surfactant coating including an inner layer and an outer layer. The inner layer covers the magnetic particle and is a monomolecular layer of a first water soluble, organic, heteropolar surfactant containing at least 3 carbon atoms and having a functional group on one end which bonds with the magnetic particle. The outer layer coats the inner layer and is a monomolecular layer of a second water soluble, organic heteropolar surfactant containing at least three carbon atoms and having a hydrophobic end bonded to the hydrophobic end of the first surfactant and a functional group on the other end capable of bonding with the particles to be magnetized.
REFERENCES:
patent: 3926789 (1975-12-01), Shubert
patent: 4019995 (1977-04-01), Briggs
patent: 4094804 (1978-06-01), Shimoiizaka
patent: 4208294 (1980-06-01), Khalafalla
patent: 4285819 (1981-08-01), Yen
patent: 4356098 (1982-10-01), Chagnon
patent: 4430239 (1984-02-01), Wyman
patent: 4554088 (1985-11-01), Whitehead
Board of Control of Michigan Technological University
Pianalto Bernard
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