Compositions – Magnetic – With wax – bitumen – resin – or gum
Patent
1988-10-19
1990-08-07
Straub, Gary P.
Compositions
Magnetic
With wax, bitumen, resin, or gum
H01F 128
Patent
active
049466151
ABSTRACT:
A method of preparing a kneaded mixture for a magnetic coating material comprises a kneading start process and a continuous kneading process. In the kneading start process, a low-viscosity composition, which is composed of magnetic layer forming materials containing ferromagnetic grains and a binder, and a solvent, is introduced into a kneading vessel of a two-shaft continuous kneading and mixing machine, and kneading is started. In the continuous kneading process, after the start of the kneading, a high-viscosity composition, in which a solvent amount is smaller by at least 7 wt % than the solvent amount in the low-viscosity composition used in the kneading start process, is continously introduced into the kneading vessel, and the kneading is continued while high shearing force is being given to the high-viscosity composition.
REFERENCES:
patent: 3728262 (1973-04-01), Lemmen et al.
patent: 4229312 (1980-10-01), Nagashiro et al.
patent: 4634632 (1987-01-01), Ogawa et al.
patent: 4668568 (1987-05-01), Fujiyama et al.
"Kurimoto Giho", No. 15, Chap. 9, separate volume, (1986,87), Kurimoto, Ltd.
Funabashi Shinichi
Kiyama Masatoshi
Komi Takao
Mizuno Chiaki
Ogawa Hiroshi
Fuji Photo Film Co. , Ltd.
Kalinchak Stephen G.
Straub Gary P.
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