Electrostatic-image-developing toner, production method thereof, electrostatic image developer, and image forming apparatus
View Patent ↗An electrostatic-image-developing toner includes a binder resin that contains a crystalline polyester resin and an amorphous polyester resin; and a coloring agent, wherein the crystalline polyester resin has a melting temperature Tmc of about 25° C. or greater but not greater than about 50° C., and a content of the crystalline polyester resin in the electrostatic-image-developing toner is about 3 wt % or greater but not greater than about 15 wt. %.
1. An electrostatic-image-developing toner comprising:
a binder resin that contains a crystalline polyester resin and an amorphous polyester resin; and
a coloring agent, wherein
the crystalline polyester resin has a melting temperature Tmc of from 25° C. to 32° C., and
a content of the crystalline polyester resin in the electrostatic-image-developing toner is about 3 wt. % or greater but not greater than about 15 wt. %.
2. The electrostatic-image-developing toner according to claim 1 , wherein the binder resin further contains a urea-modified polyester resin.
3. The electrostatic-image-developing toner according to claim 2 , wherein the urea-modified polyester resin is obtained by a reaction between a polyester resin containing an isocyanate group and an amine.
4. The electrostatic-image-developing toner according to claim 1 , wherein the crystalline polyester resin has an acid value AVc of about 5 mgKOH/g or greater but not greater than about 20 mgKOH/g.
5. The electrostatic-image-developing toner according to claim 1 , wherein the crystalline polyester resin has a weight average molecular weight (Mw) of about 10,000 or greater but not greater than about 30,000.
6. The electrostatic-image-developing toner according to claim 1 , wherein the amorphous polyester resin has an acid value AVa of about 10 mgKOH/g or greater but not greater than about 20 mgKOH/g.
7. The electrostatic-image-developing toner according to claim 1 , wherein the amorphous polyester resin has a weight average molecular weight (Mw) of about 10,000 or greater but not greater than about 50,000.
8. The electrostatic-image-developing toner according to claim 1 , wherein the amorphous polyester resin has a glass transition temperature (Tg) of about 40° C. or greater but not greater than about 60° C.
9. The electrostatic-image-developing toner according to claim 3 , wherein an [NCO]/[OH] equivalent ratio is about 1/1 or greater but not greater than about 5/1 wherein [NCO] represents the isocyanate group and [OH] represents a hydroxyl group of the polyester resin.
10. The electrostatic-image-developing toner according to claim 1 , further comprising a releasing agent that has a melting temperature Tmw of about 50° C. or greater but not greater than about 120° C.
11. The electrostatic developing toner according to claim 1 , which has a volume average particle size of about 4 μm or greater but not greater than about 8 μm.
12. The electrostatic-image-developing toner according to claim 1 , which has a volume average particle size distribution index GSDv of about 1.27 or less.
13. The electrostatic-image-developing toner according to claim 1 , which has a shape factor SF 1 of about 110 or greater but not greater than about 140.
14. The electrostatic-image-developing toner according to claim 1 , which has a water content of about 0.01 wt. % or greater but not greater than about 10 wt. %.
15. An electrostatic image developer comprising:
the electrostatic-image-developing toner as claimed in claim 1 ; and
a carrier.