Electrostatic latent image developing toner, manufacturing method for electrostatic latent image developing toner, electrostatic latent image developing developer, and image forming method
View Patent ↗The present invention provides an electrostatic latent image developing toner including a binding resin having an acidic polar group, a magnetic powder, and a carboxylic acid group-containing compound, the toner having a shape factor (SF1) of 110 to 140, wherein the carboxylic acid group-containing compound has a weight-average molecular weight of 1800 to 50,000 and an acid value of 150 to 600 mg KOH/g.
1. An electrostatic latent image developing toner comprising
a binding resin having an acidic polar group,
a gelated carboxylic acid group-containing compound in which a magnetic powder is dispersed,
the toner having a shape factor (SF1) of 110 to 140, wherein
the carboxylic acid group-containing compound has a weight-average molecular weight, excluding the magnetic powder, of 1800 to 50,000 and an acid value of 200 to 500 mg KOH/g; and
a solid content amount, excluding the magnetic powder, of the carboxylic acid group-containing compound is 0.5 to 30.0% by mass based on a solid content amount of the magnetic powder.
2. The electrostatic latent image developing toner of claim 1 , wherein the binding resin'has a carboxylic acid group.
3. The electrostatic latent image developing toner of claim 1 , wherein the binding resin is a vinyl resin.
4. The electrostatic latent image developing toner of claim 1 , wherein the binding resin has a glass transition point of 40° C. to 70° C.
5. The electrostatic latent image developing toner of claim 1 , wherein the binding resin has a weight-average molecular weight of 6000 to 45,000.
6. The electrostatic latent image developing toner of claim 1 , wherein the ratio (Mw/Mn) of the weight-average molecular weight to the number-average molecular weight of the binding resin is 3.3 or lower.
7. The electrostatic latent image developing toner of claim 1 , further comprising a release agent, wherein the content of the release agent is 6 to 25% by mass based on the total mass of the toner.
8. The electrostatic latent image developing toner of claim 1 , wherein an external additive is added onto the surface of the toner particles, and the amount of the external additive is 0.1 to 20% by mass based on the mass of the toner particles.
9. An electrostatic latent image developing developer comprising a toner, wherein the toner is the electrostatic latent image developing toner of claim 1 .
10. The electrostatic latent image developing toner of claim 1 , wherein the carboxylic acid group-containing compound has an acid value of 250 to 400 mg KOH/g.
11. The electrostatic latent image developing developer of claim 9 , wherein the carboxylic acid group-containing compound has an acid value of 250 to 400 mg KOH/g.