Abstract An electrophotographic toner composition comprising (A) toner particles with an average particle diameter of 9 μm or less comprising at least a binder resin and a colorant, and (B) an additive, wherein the additive is a fine metal oxide powder surface coated with at least one agent for imparting hydrophobic property selected from the group consisting of the following formulae (1), (2) and (3): R.sub.1 Si(X).sub.3 R.sub.1 R.sub.2 Si(X).sub.2 R.sub.1 R.sub.2 R.sub.3 Si(X).sub.1 wherein R 1 represents a substituted or unsubstituted alkyl group having a molecular weight of 113 or more, R 2 and R 3 each represents hydrogen, an alkyl group or an allyl group, and X represents chlorine, an alkoxy group or an acetoxy group. The toner composition causes no impaction to a carrier and no adhesion of the toner particles to a photoreceptor, and can form stable, sufficient images for a long time.
An electrophotographic toner composition comprising (A) toner particles with an average particle diameter of 9 μm or less comprising at least a binder resin and a colorant, and (B) an additive, wherein said additive is a fine metal oxide powder surface coated with at least one agent for imparting hydrophobic property selected from the group consisting of the following formulae (1), (2) and (3): R.sub.1 Si(X).sub.3 ( 1) R.sub.1 R.sub.2 Si(X).sub.2 ( 2) R.sub.1 R.sub.2 R.sub.3 Si(X).sub.1 ( 3) wherein R 1 represents a substituted or unsubstituted alkyl group having a molecular weight of 113 or more, R 2 and R 3 each represents hydrogen, an alkyl group or an allyl group, and X represents chlorine, an alkoxy group or an acetoxy group.
Claim 2
Dependent Claim
123 words
An electrophotographic toner composition comprising (A) toner particles with an average particle diameter of 9 μm or less comprising at least a binder resin and a colorant, and (B) an additive, wherein said additive is a fine metal oxide powder surface coated with at least one agent for imparting hydrophobic property selected from the group consisting of the following formulae (1), (2) and (3): R.sub.1 Si(X).sub.3 ( 1) R.sub.1 R.sub.2 Si(X).sub.2 ( 2) R.sub.1 R.sub.2 R.sub.3 Si(X).sub.1 ( 3) wherein R 1 represents a substituted or unsubstituted alkyl group having a molecular weight of 113 or more, R 2 and R 3 each represents hydrogen, an alkyl group or an allyl group, and X represents chlorine, an alkoxy group or an acetoxy group.
Claim 3
Dependent Claim
19 words
An electrophotographic toner composition as in claim 1, wherein R 1 has a molecular weight or 140 or more.
Claim 4
Dependent Claim
23 words
An electrophotographic toner composition as in claim 1, wherein said toner particles have an average particle diameter of from 4 to 8 μm.