Electrophotographic toner and process for producing the same

An electrophotographic toner comprising capsule toner particles having adhered on the surface thereof

• (a) a polymer comprising at least 5 mol % of a monomer unit derived from a fluorine-containing vinyl monomer represented by formula (I) or (II):
• ##STR4## wherein X represents COO, OCO, O, or a p-phenylene group;
• R.sub.1 and R.sub.2 each represent a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms;
• m represents an integer of from 1 to 7;
• n represents an integer of from 1 to 19, o and p each represent an integer of from 0 to 7;
• and Y represents a hydrogen atom or a fluorine atom;
• and
• (b) conductive fine particles.

A process for producing an electrophotographic toner comprising graft polymerizing a monomer having at least two radical chain transfer groups on the toner particles having thereon a substance capable of forming a radical and then radical polymerizing at least 5 mol % of a fluorine-containing vinyl monomer represented by formula (I) or (II):

• ##STR5## wherein X represents COO, OCO, O, or a p-phenylene group;
• R.sub.1 and R.sub.2 each represent a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms;
• m represents an integer of from 1 to 7;
• n represents an integer of from 1 to 19, o and p each represent an integer of from 0 to 7;
• and Y represents a hydrogen atom or a fluorine atom, or a mixture of said monomer represented by formula (I) or (II) and a copolymerizable monomer.

An electrophotographic toner comprising toner particles having adhered on the surface thereof a polymer comprising at least 5 mol % of a monomer unit derived from a fluorine-containing vinyl monomer represented by formula (I) or (II):

• ##STR6## wherein X represents COO or a p-phenylene group;
• R.sub.1 and R.sub.2 each represent a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms;
• m represents an integer of from 1 to 7;
• n represents an integer of from 1 to 19, o and p each represent an integer of from 0 to 7;
• and Y represents a hydrogen atom or a fluorine atom.

An electrophotographic toner comprising capsule toner particles having adhered on the surface thereof

• (a) a polymer comprising at least 5 mol % of a monomer unit derived form a fluorine-containing vinyl monomer represented by formula (I) or (II):
• ##STR7## wherein X represents COO or a p-phenylene group;
• R.sub.1 and R.sub.2 each represent a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms;
• m represents an integer of from 1 to 7;
• n represents an integer of from 1 to 19, o and p each represent an integer of from 0 to 7;
• and Y represents a hydrogen atom or a fluorine atom;
• and
• (b) conductive fine particles.

A process for producing an electrophotographic toner comprising graft polymerizing a monomer having at least two radical chain transfer groups on the toner particles having thereon a substance capable of forming a radical and then radical polymerizing at least 5 mol % of a fluorine-containing vinyl monomer represented by formula (I) or (II):

• ##STR8## wherein X represents COO or a p-phenylene group;
• R.sub.1 and R.sub.2 each represent a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms;
• m represents an integer of from 1 to 7;
• n represents an integer of from 1 to 19, o and p each represent an integer of from 0 to 7;
• and Y represents a hydrogen atom or a fluorine atom, or a mixture of said monomer represented by formula (I) or (II) and a copolymerizable monomer.