Toner composition for electrophotography

A toner composition for electrophotography comprising (i) toner particles comprising a binder and a colorant and (ii) an additive wherein said additive is crystalline titanium dioxide fine particles, in at least one of a rutile form and an anatase form, (a) that have been treated with a coupling agent and (b) that have a rice-grain shape, a primary particle size of about 150 to 3000 .ANG., a specific surface area of 60-100 m.sup.2 /g, about 1.4.times.10.sup.20 hydroxy groups on the surface of said particles per gram of particles, and a Karl Fischer moisture content of not more than 5% by weight of said particles, said coupling agent being a compound represented by formulae (I), (II) or (III):

• R.sup.1 Si(X).sub.3 (I)
• R.sup.1' R.sup.2 Si(X).sub.2 (II)
• R.sup.1' R.sup.2 R.sup.3 SiX (III)
• wherein R.sup.1 represents an alkyl group having 10 to 20 carbon atoms;
• R.sup.1' represents an alkyl group having 1 to 20 carbon atoms;
• R.sup.2 and R.sup.3 each represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 30 carbon atoms;
• and X represents a chlorine atom, an alkoxy group having 1 to 10 carbon atoms or an acetoxy group having 3 to 5 carbon atoms.