Compositions – Magnetic – With wax – bitumen – resin – or gum
Reexamination Certificate
2005-05-17
2005-05-17
Koslow, C. Melissa (Department: 1755)
Compositions
Magnetic
With wax, bitumen, resin, or gum
C399S277000
Reexamination Certificate
active
06893580
ABSTRACT:
A composition for synthetic resin magnets (such as magnet rollers for electrophotography process) which is composed of a resin binder and a magnetic powder mixed and dispersed therein. The resin compound has improved melt flow rate because the binder contains a thermoplastic and an aliphatic polyamide. Owing to its improved melt flow rate, the resin compound can be incorporated with a large amount of magnetic powder without deterioration in moldability. Thus the resulting plastic magnet has a strong magnetic force. In addition, the composition for synthetic resin magnets may be incorporated with a hindered phenol antioxidant, so that it is molded at a higher temperature (120-180° C.) than usual to achieve the same object as mentioned above.
REFERENCES:
patent: 5376291 (1994-12-01), Watanabe
patent: 5409624 (1995-04-01), Watanabe
patent: 5958283 (1999-09-01), Schmid et al.
patent: 5-304013 (1993-11-01), None
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patent: 8-167512 (1996-06-01), None
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patent: 2000-12319 (2000-01-01), None
patent: 2001-240740 (2001-09-01), None
Translation of JP 2001-240740.
Daifuku Hideharu
Kawano Kota
Bridgestone Corporation
Koslow C. Melissa
Sughrue & Mion, PLLC
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