Colored resin particles, manufacturing method of the colored resin particles and toner for electrostatically charged image development

Abstract

Colored resin particles, each includes: a resin; and a colorant, wherein a value of average equivalent circle diameter A (μm) of the colored resin particles is 3≦A≦6, an average degree of circularity B of the colored resin particles satisfies the following expression (1), and 0.990−0.0083 A≦B ≦1.021−0.0117 A   (1) a cumulative number frequency of particles which have degrees of circularity of less than 0.9 in the colored resin particles is 1% or less.

1 . Colored resin particles, each comprising:
 a resin; and   a colorant,   wherein a value of average equivalent circle diameter A (μm) of the colored resin particles is 3≦A≦6,   an average degree of circularity B of the colored resin particles satisfies the following expression (1), and
   0.990−0.0083 A≦B≦ 1.021−0.0117 A   (1) 
   a cumulative number frequency of particles which have degrees of circularity of less than 0.9 in the colored resin particles is 1% or less.   
     
     
         2 . The colored resin particles according to  claim 1 ,
 wherein a variation coefficient of degree of circularity (a standard deviation of degree of circularity/the average degree of circularity B) of the colored resin particles is 0.016 or less.   
     
     
         3 . A manufacturing method of the colored resin particles according to  claim 1 , the method comprising:
 preparing a reactor that includes a first channel, a second channel, a first confluent channel where the first channel and the second channel converge and a temperature control unit that controls a temperature of the first confluent channel;   feeding a coagulated particle dispersion containing coagulated particles that contain resin particles and a colorant to the first channel;   stopping growth of coagulation of the coagulated particles by feeding a liquid containing a coagulation stopper from the second channel; and   coalescing the coagulated particles by heating the first confluent channel.   
     
     
         4 . The manufacturing method according to  claim 3 ,
 wherein a laminar flow is formed at the first confluent channel at least in the stopping of the growth of coagulation.   
     
     
         5 . The manufacturing method according to  claim 3 ,
 wherein the coagulated particle dispersion is fed so as not to be in contact with an inner wall of the first confluent channel.   
     
     
         6 . The manufacturing method according to  claim 3 ,
 wherein a sheath flow is formed between an inner wall of the first confluent channel and a mixed solution of the coagulated particle dispersion and the liquid containing the coagulation stopper.   
     
     
         7 . The manufacturing method according to  claim 3 ,
 wherein an inner wall of the first channel and an inner wall of the first confluent channel are not continuously formed.   
     
     
         8 . The manufacturing method according to  claim 3 ,
 wherein a peripheral channel diameter of the first confluent channel is larger than a channel diameter of the first channel.   
     
     
         9 . The manufacturing method according to  claim 3 ,
 wherein a ratio of a quantity of flow of a liquid fed to the first channel and a quantity of flow of a liquid fed to the second channel is 1/0.3 to 1/100.   
     
     
         10 . The manufacturing method according to  claim 3 ,
 wherein the temperature control unit is a microwave applicator.   
     
     
         11 . The manufacturing method according to  claim 3 ,
 wherein the reactor further includes a control unit of quantity of flow that varies a quantity of flow to be fed.   
     
     
         12 . The manufacturing method according to  claim 11 ,
 wherein the control unit of quantity of flow is provided on a feeding port side of a liquid.   
     
     
         13 . The manufacturing method according to  claim 3 ,
 wherein a main component of liquid components in the coagulated particle dispersion and a main component of liquid components in the liquid containing the coagulation stopper are the same liquid.   
     
     
         14 . The manufacturing method according to  claim 3 , further comprising:
 cooling the coalesced coagulated particles.   
     
     
         15 . The manufacturing method according to  claim 3 ,
 wherein the reactor further includes a third channel and a second confluent channel where the first confluent channel and the third channel converge, and   the manufacturing method further comprises:   feeding a liquid containing a shape controlling agent from the third channel; and   heating the second confluent channel.   
     
     
         16 . The manufacturing method according to  claim 15 ,
 wherein the coagulated particle dispersion fed from the first channel and a liquid fed from at least one of the second channel and the third channel form a concentric circle flow with the coagulated particle dispersion as a center of the concentric circle flow.   
     
     
         17 . The manufacturing method according to  claim 15 ,
 wherein a ratio of a quantity of flow of a liquid fed to the first channel and a quantity of flow of a liquid fed to the third channel is 1/0.3 to 1/100.   
     
     
         18 . A toner for electrostatically charged image development, comprising:
 the colored resin particles according to  claim 1 .