Magnetic coated carrier two-component type developer and develop

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

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430108, 430111, 430122, G03G 9107, G03G 1309

Patent

active

061656631

ABSTRACT:
A magnetic coated carrier suitable for constituting a two-component type developer for use in electrophotography is composed of magnetic coated carrier particles comprising magnetic coated carrier particles comprising magnetic carrier core particles each comprising a binder resin and metal oxide particles, and a coating layer surface-coating each carrier core particle. The metal oxide particles have been subjected to a surface lipophilicity-imparting treatment. The magnetic carrier core particles have a resistivity of at least 1.times.10.sup.10 ohm.cm, and the magnetic coated carrier has a resistivity of at least 1.times.10.sup.12 ohm.cm. The magnetic coated carrier has a particle size distribution such that (i) it has a number-average particle size Dn of 5-100 .mu.m, (ii) it satisfies a relationship of Dn/.sigma..gtoreq.3.5, wherein .sigma. denotes a standard deviation of number-basis particle size distribution of the carrier, and (iii) it contains at most 25% by number of particles having particle sizes of at most Dn.times.2/3.

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Database WPI, Section Ch, Week 9342, Derwent Pub., Class A89, An93-33076, XP002035820.

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