Resin particle liquid dispersion for electrostatic image developing toner, electrostatic image developing toner, production method thereof, developer and image forming method

Abstract

A resin particle liquid dispersion for an electrostatic image developing toner, comprising: an aqueous medium; and a resin particle dispersed in the aqueous medium to have a median diameter of 0.05 to 2.0 μm, the resin particle comprising a polycondensable polymer obtained by polycondensing polycondensable monomers, wherein a storage modulus GL(30) of the resin particle at 30° C. is 1×10 7 Pa or more, and a melting point of the polycondensable polymer is from 45 to 110° C.

1 . A resin particle liquid dispersion for an electrostatic image developing toner, comprising: 
 an aqueous medium; and    a resin particle dispersed in the aqueous medium to have a median diameter of 0.05 to 2.0 μm, the resin particle comprising a polycondensable polymer obtained by polycondensing polycondensable monomers,    wherein a storage modulus GL(30) of the resin particle at 30° C. is 1×10 7  Pa or more, and a melting point of the polycondensable polymer is from 45 to 110° C.    
   
   
       2 . The resin particle liquid dispersion for an electrostatic image developing toner according to  claim 1 , 
 wherein change in a storage modulus of the resin particle from 10 6  Pa to 10 4  Pa occurs by a temperature change within 10° C.    
   
   
       3 . The resin particle liquid dispersion for an electrostatic image developing toner according to  claim 1 , 
 wherein change in a storage modulus of the resin particle from 10 7  Pa to 10 3  Pa occurs by a temperature change within 20° C.    
   
   
       4 . The resin particle liquid dispersion for an electrostatic image developing toner according to  claim 1 , 
 wherein when a common logarithm of the storage modulus of the resin particles is plotted with respect to temperature, assuming that a melting point of the resin particle is Tm, a storage modulus at Tm+20° C. is G′(Tm+20), and a storage modulus at Tm+50° C. is G′(Tm+50), condition of the following formula (1) is satisfied:      |log  G ′( Tm+ 20)−log  G ′( Tm+ 50)|≦1.5  (1)    
   
   
       5 . The resin particle liquid dispersion for an electrostatic image developing toner according to  claim 1 , 
 wherein a constitutional ratio of at least one of: an unsaturated bond-containing carboxylic acid; its acid anhydride; and its lower ester is from 20.0 to 50.0 wt % based on all monomers constituting the resin particle.    
   
   
       6 . The resin particle liquid dispersion for an electrostatic image developing toner according to  claim 1 , 
 wherein the resin particle has an acid value of 1 to 50 mgKOH/g.    
   
   
       7 . The resin particle liquid dispersion for an electrostatic image developing toner according to  claim 1 , 
 wherein the resin particle has a glass transition temperature Tg of from 40 to 100° C.    
   
   
       8 . The resin particle liquid dispersion for an electrostatic image developing toner according to  claim 1 , 
 wherein a constitutional ratio of a polyisocyanate having 1.5 or more isocyanate groups on average within one molecule is from 20.0 to 90.0 wt % based on all monomers constituting the resin particle.    
   
   
       9 . A method for producing the resin particle liquid dispersion for an electrostatic image developing toner according to  claim 1 , the method comprising: 
 preparing an emulsified liquid dispersion comprising an aqueous medium and an oil phase comprising at least polycondensable monomers, the oil phase being dispersed in the aqueous medium; and    polycondensing the polycondensable monomers.    
   
   
       10 . The method for producing a resin particle liquid dispersion for an electrostatic image developing toner according to  claim 9 , 
 wherein assuming that a melting point of the resin particle is Tm, a polycondensation temperature Tc satisfies (Tm−20° C.)<Tc<(Tm+20° C.),    
   
   
       11 . The method for producing a resin particle liquid dispersion for an electrostatic image developing toner according to  claim 9 , 
 wherein assuming that the highest temperature out of melting points of the polycondensable monomers is Th, the polycondensation temperature Tc satisfies 45° C.<Tc<Th.    
   
   
       12 . The method for producing a resin particle liquid dispersion for an electrostatic image developing toner according to  claim 9 , the method further comprising 
 rapidly cooling the resin particle liquid dispersion to a temperature of —10° C. or more and Tc−60° C. or less at 2° C./min or more after the polycondensing.    
   
   
       13 . A method for producing an electrostatic image developing toner, comprising: 
 aggregating resin particles in a liquid dispersion comprising at least a resin particle liquid dispersion to obtain aggregate particles; and    heating and coalescing the aggregate particles,    wherein the resin particle liquid dispersion is a resin particle liquid dispersion for an electrostatic image developing toner according to  claim 1 .    
   
   
       14 . A method for producing an electrostatic image developing toner, comprising 
 aggregating resin particles in a liquid dispersion comprising at least a resin particle liquid dispersion to obtain aggregate particles; and    heating and coalescing the aggregate particles,    wherein the resin particle liquid dispersion is a resin particle liquid dispersion for an electrostatic image developing toner produced by a method according to  claim 9 .    
   
   
       15 . An electrostatic image developer comprising 
 an electrostatic image developing toner obtained by a method using a resin particle liquid dispersion for an electrostatic image developing toner according to  claim 1;  and    a carrier.    
   
   
       16 . An image forming method comprising: 
 forming an electrostatic latent image on a surface of a latent image-holding member;    developing the electrostatic latent image formed on the surface of the latent image-holding member with a developer containing a toner to form a toner image;    transferring the toner image formed on the surface of the latent image-holding member to a surface of a transferee member; and    heat-fixing the toner image transferred to the surface of the transferee member,    wherein the toner is the electrostatic image developing toner obtained by a method for producing an electrostatic image developing toner according to  claim 14 .    
   
   
       17 . An image forming method comprising: 
 forming an electrostatic latent image on a surface of a latent image-holding member;    developing the electrostatic latent image formed on the surface of the latent image-holding member with a developer containing a toner to form a toner image;    transferring the toner image formed on the surface of the latent image-holding member to a surface of a transferee member; and    heat-fixing the toner image transferred to the surface of the transferee member,    wherein the developer is the electrostatic image developer according to  claim 15.