Triboelectrically chargeable magnetic carrier particles having magnetic powder dispersed in acidic resin basic amino resin reaction product binder
AssigneeAgfa-Gevaert
InventorsSerge M. Tavernier, Pierre R. De Roo
Life of this patent
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Abstract
Magnetic carrier particles that can be positively charged triboelectrically and are suited for serving in magnetic brush toner-carrier development wherein said carrier particles comprise finely divided magnetically attractable powder dispersed in a resin binder which for at least 75% by weight consists of the acid-base reaction product of at least one acidic binder resin having an acid number in the range of 5 to 50 mg KOH/g, and at least one basic binder resin having free amin groups in an amount equivalent with 2 to 50 mg KOH/g and being present in an amount of at least 10% by weight with respect to such acidic resin.
Claims16
A particulate material suited for serving as carrier particles in magnetic brush toner-carrier development of electrostatic charge patterns, said particles comprising finely divided magnetically attractable powder dispersed in a resin binder matrix, characterized in that the binder consists of at least 75% by weight of an acid-base reaction product of at least one acidic binder resin having an acid number in the range of 5 to 50 mg KOH/g, and at least one basic binder resin having free amino groups in an amount equivalent with 2 to 50 mg KOH/g and being present in an amount of at least 10% by weight with respect to such acidic resin.
Dependencies are inferred from the claim text.