G - Physics – 03 – G
Patent
G - Physics
03
G
204/91.81
G03G 5/16 (2006.01) B22F 9/24 (2006.01) G03G 19/00 (2006.01) G11B 5/702 (2006.01) G11B 5/716 (2006.01) G11B 5/84 (2006.01) G11B 5/842 (2006.01) G11B 5/855 (2006.01)
Patent
CA 1151104
METHOD FOR FORMING IN SITU MAGNETIC MEDIA IN THE FORM OF DISCRETE PARTICLES Abstract of the Disclosure A method of forming discrete magnetic particles in situ by dispersing a nickel hypophosphite solution in a binder and binder solvent, such as polyvinyl alcohol in water or polyester urethane polymer in an organic solvent, forming a coating from the nickel hypophosphite binder solution on a substrate, and exposing the coating to a radient energy source, such as x-rays or an electron beam. Thereafter the incipient magnetic media in the area exposed to radiation is developed by contact with a solution including ions of at least one of cobalt, nickel and iron and a reducing agent, such as a hypophosphite ion, to produce a magnetic media of discrete magnetic particles within the binder in the area exposed to the radiant energy while not forming such mag- netic particles in other unexposed areas of the nickel hypophosphite coating.
372414
Pickart Don E.
Reed Philip W.
Vranka Joseph S.
International Business Machines Corporation
Rosen Arnold
LandOfFree
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