Compositions – Magnetic – With wax – bitumen – resin – or gum
Patent
1989-03-17
1996-08-20
Lovering, Richard D.
Compositions
Magnetic
With wax, bitumen, resin, or gum
428413, 428418, 523428, H01F 1113, H01F 1117, C08L 6308
Patent
active
055475990
ABSTRACT:
A composition of ferrite and epoxy having the form of a film which can be cut, pressed onto word straps, and heat-cured to form an encapsulating keeper on a plated wire memory. The film comprises ferrite powder in a mixture of epoxy resins, typically Epon 1009 and Epon 828, pulverized dicyandiamide and butadiene/acrylonitrile rubber. The mixture is sprayed onto a sheet of halogenated polyolefin and air dried for 8-12 hours at between 160.degree. F. and 180.degree. F. The resulting flexible film is die cut to fit over word straps and further processed by applying 50-75 psi at 325.degree. F. for one hour.
REFERENCES:
patent: 4547425 (1985-10-01), Naruse
patent: 4601947 (1986-07-01), Shimada et al.
patent: 4794042 (1988-12-01), Kubota et al.
patent: 4824587 (1989-04-01), Kwon et al.
patent: 4828916 (1989-03-01), Yamamoto et al.
Bagdasarian Samuel L.
Wolfrey Austin A.
Lovering Richard D.
Mofford Donald F.
Raytheon Company
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