Electrophotographic toner, electrophotographic developer and production method of electrophotographic toner
AssigneeKonica Minolta Business Technologies, Inc.
InventorsMikio Kouyama, Kenji Hayashi, Hiroaki Obata
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Abstract
An electrophotographic toner which is thermally stable in storage or as an image after being fixed and exhibits a sufficiently low melt viscosity and a high fluidity when heated during fixing is disclosed, comprising a colorant and a binder resin, wherein the binder resin contains a poly-branched resin composition in an amount of 0.5 to 20% by mass. There is also disclosed a method of producing the electrophotographic toner.
Claims10
A method producing an electrophotographic toner comprising toner particles, the method comprising:
- (a) dissolving at least a poly-branched resin composition radical-polymerizable monomer to form a monomer mixture,
- (b) emulsifying the monomer mixture to form a monomer emulsion
- (c) subjecting the monomer emulsion to polymerization to form resin microparticles containing a poly-branched resin and
- (d) subjecting the resin microparticle and colorant microparticles to coagulation and fusion to form the toner particles,
- wherein the poly-branched resin composition is prepared by a process of adding a polymerization initiator to a mixture of a compound having at least two vinyl groups and a radical-polymerizable monomer to perform polymerization.
A method of producing an electrophotographic toner comprising toner particles, the method comprising:
- (a) dissolving at least a poly-branched resin composition in a radical-polymerizable monomer to form a monomer mixture,
- (b) emulsifying the monomer mixture to form a monomer emulsion,
- (c) subjecting the monomer emulsion to polymerization to form resin microparticles containing a poly-branched resin and
- (d) subjecting the resin microparticle and colorant microparticles to coagulation and fusion to form the toner particles,
- wherein the poly-branched resin composition is prepared by a process of adding a chain transfer agent having at least two chain transfer units to a radical-polymerizable monomer to perform polymerization.
A method of roducin an electrophotographic toner comprising toner particles, the method comprising:
- (a) dissolvinq at least a poly-branched resin composition in a radical-polymerizable monomer to form a monomer mixture,
- (b) emulsifying the monomer mixture to form a monomer emulsion,
- (c) subjecting the monomer emulsion to polymerization to form resin microparticles containing a poly-branched resin and
- (d) subjecting the resin microparticle and colorant microparticles to coagulation and fusion to form the toner particles,
- wherein the poly-branched resin composition is prepared by a process of adding a polymerization initiator having at least two radical polymerization initiator units to a radical-polymerizable monomer to perform polymerization.
Dependencies are inferred from the claim text.