Toner and method for producing toner
AssigneeCanon Kabushiki Kaisha
InventorsTsutomu Shimano, Yoshihiro Nakagawa, Masatake Tanaka, Naoya Isono, Yu Yoshida
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Abstract
The toner comprising a toner particle having a core-shell structure that contains a core containing an amorphous resin A and a crystalline resin and a shell containing an amorphous resin B, wherein the amorphous resin A contains a styrene-acrylic resin, the content of the styrene-acrylic resin is at least 50% by mass based on the total mass of the amorphous resin A, a degree of compatibility A between the amorphous resin A and the crystalline resin is at least 50% and not more than 100%, and a degree of compatibility B between the amorphous resin B and the crystalline resin is at least 0% and not more than 40%.
Claims6
A toner comprising a toner particle having a core-shell structure that contains a core and a shell on the core, wherein
- the core comprises an amorphous resin A and a crystalline resin,
- the shell comprises an amorphous resin B,
- the amorphous resin A comprises a styrene-acrylic resin,
- a content of the styrene-acrylic resin is at least 50% by mass based on the total mass of the amorphous resin A,
- a degree of compatibility A between the amorphous resin A and the crystalline resin, calculated with the following formula (X), is at least 50% and not more than 100%
- degree of compatibility A (%)=100−(100×ΔH(A))/(ΔH(C)×C/100) (X), and
- a degree of compatibility B between the amorphous resin B and the crystalline resin, calculated with the following formula (Y), is at least 0% and not more than 40%
- degree of compatibility B (%)=100−(100×ΔH(B))/(ΔH(C)×D/100) (Y),
- wherein, in formulae (X) and (Y),
- ΔH(A) represents an exothermic quantity (J/g) of an exothermic peak of a resin mixture A in differential scanning calorimetric analysis, the resin mixture A consisting of the amorphous resin A and the crystalline resin,
- ΔH(C) represents an exothermic quantity (J/g) of an exothermic peak of the crystalline resin in differential scanning calorimetric analysis,
- C represents a mass ratio (%) of the crystalline resin in the resin mixture A,
- ΔH(B) represents an exothermic quantity (J/g) of an exothermic peak of a resin mixture B in differential scanning calorimetric analysis, the resin mixture B consisting of the amorphous resin B and the crystalline resin, and
- D represents a mass ratio (%) of the crystalline resin in the resin mixture B.
A method for producing a toner comprising a toner particle having a core-shell structure that contains a core and a shell on the core, wherein
- the core comprises an amorphous resin A and a crystalline resin,
- the shell comprises an amorphous resin B,
- the amorphous resin A comprises a styrene-acrylic resin,
- a content of the styrene-acrylic resin is at least 50% by mass based on the total mass of the amorphous resin A,
- a degree of compatibility A between the amorphous resin A and the crystalline resin, calculated with the following formula (X), is at least 50% and not more than 100%
- degree of compatibility A (%)=100−(100×ΔH(A))/(ΔH(C)×C/100) (X), and
- a degree of compatibility B between the amorphous resin B and the crystalline resin, calculated with the following formula (Y), is at least 0% and not more than 40%
- degree of compatibility B (%)=100−(100×ΔH(B))/(ΔH(C)×D/100) (Y),
- (wherein, in formulae (X) and (Y),
- ΔH(A) represents an exothermic quantity (J/g) of an exothermic peak of a resin mixture A of the amorphous resin A and the crystalline resin in differential scanning calorimetric analysis,
- ΔH(C) represents an exothermic quantity (J/g) of an exothermic peak of the crystalline resin in differential scanning calorimetric analysis,
- C represents a mass ratio (%) of the crystalline resin in the resin mixture A,
- ΔH(B) represents an exothermic quantity (J/g) of an exothermic peak of a resin mixture B of the amorphous resin B and the crystalline resin in differential scanning calorimetric analysis, and
- D represents a mass ratio (%) of the crystalline resin in the resin mixture B), and wherein
- the method comprises steps of:
- forming, in an aqueous medium, a particle of a monomer composition that comprises the crystalline resin, the amorphous resin B, and a monomer capable of forming the amorphous resin A;
- and
- obtaining a toner particle by polymerizing the monomer present in the particle of the monomer composition.
Dependencies are inferred from the claim text.