Gas separation: apparatus – Magnetic separating means
Patent
1976-10-26
1978-08-22
Martin, Jr., Roland E.
Gas separation: apparatus
Magnetic separating means
252 621P, 427 22, G03G 1320, G03G 900
Patent
active
041086538
ABSTRACT:
Polyethylene having an average molecular weight of at least 1,500, a crystallinity of at least 75% and a density of at least 0.93 has been found advantageous as a base material for making pressure-fixable toner powder for developing electrostatic images. The toner powder can be fixed satisfactorily to image substrates by the pressure of fixing rollers of conventional electrophotographic copying apparatus, yet it can be produced readily by grinding a suitable composition based on the polyethylene. The polyethylene preferably has an average weight of between 2,000 and 10,000, a crystallinity of at least 80% and a density of at least 0.94. Especially advantageous pressure-fixable, electrically conductive toner powders are obtained from pigmented masses of the polyethylene in which 3 to 20% of the weight consists of carbon black having a specific surface of at least 750 m.sup.2 /g, preferably of about 1,000 m.sup.2 /g, and an oil absorption of between 250 and 400 ml/g.
REFERENCES:
patent: 3788994 (1974-01-01), Wellman et al.
patent: 3853778 (1974-12-01), Buckley
patent: 3967962 (1976-07-01), O'Malley
Goodrow John L.
Johnston Albert C.
Martin Jr. Roland E.
Oce'-van der Grinten N.V.
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