MAGNETIC CARRIER PARTICLES

Positively triboelectrically chargeable 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 of a mixture 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 the acidic resin(s), and wherein between said resins during forming said mixture an acid-base reaction has taken place.