Charge control resin particles and toner for developing electrostatic images

Abstract

Charge control resin particles comprising a mixture of at least a charge control agent and a resin, wherein a crystalline zinc 3,5-di-tert-butylsalicylate represented by General Formula below, and having major peaks of X-ray diffraction using the CuK α-characteristic X-ray at Bragg angles 2θ of at least 6.4±0.2° and 15.4±0.2°, is contained as said charge control agent. Toner for developing electrostatic images which comprises a coloring agent, a binder resin for toner, and the charge control resin particles.

What is claimed is:  
     
         1 . A charge control resin particles comprising a mixture of at least a charge control agent and a resin, wherein a crystalline zinc 3,5-di-tert-butylsalicylate represented by General Formula (1) below, and having major peaks of X-ray diffraction using the CuK α-characteristic X-ray at Bragg angles 2θ of at least 6.4±0.2° and 15.4±0.2°, is contained as said charge control agent.  
       
         
           
           
               
               
           
         
       
       in Formula (1), t-Bu represents a tert-butyl group.  
     
     
         2 . The charge control resin particles of  claim 1  wherein said zinc 3,5-di-tert-butylsalicylate has major peaks of X-ray diffraction using the CuK α-characteristic X-ray at Bragg angles 2θ of at least 5.7±0.2°, 6.4±0.2° and 15.4±0.2°.  
     
     
         3 . The charge control resin particles of  claim 1  wherein said zinc 3,5-di-tert-butylsalicylate has major peaks of X-ray diffraction using the CuK α-characteristic X-ray at Bragg angles 2θ of at least 5.2±0.2°, 5.7±0.2°, 6.4±0.2°, 6.7±0.2° and 15.4±0.2°.  
     
     
         4 . A charge control resin particles comprising a mixture of at least a charge control agent and a resin, wherein a crystalline zinc 3,5-di-tert-butylsalicylate represented by General Formula (1) below, and having major peaks of X-ray diffraction using the CuK α-characteristic X-ray at Bragg angles 2θ of at least 7.7±0.2° and 15.7±0.2°, is contained as said charge control agent.  
       
         
           
           
               
               
           
         
       
       in Formula (1), t-Bu represents a tert-butyl group.  
     
     
         5 . The charge control resin particles of  claim 4  wherein said zinc 3,5-di-tert-butylsalicylate has major peaks of X-ray diffraction using the CuK α-characteristic X-ray at Bragg angles 2θ of at least 5.2±0.2°, 6.7±0.2°, 7.7±0.2° and 15.7±0.2°.  
     
     
         6 . The charge control resin particles of  claim 1  wherein said charge control agent consists essentially of the aforementioned crystalline zinc 3,5-di-tert-butylsalicylate.  
     
     
         7 . The charge control resin particles of  claim 4  wherein said charge control agent consists essentially of the aforementioned crystalline zinc 3,5-di-tert-butylsalicylate.  
     
     
         8 . The charge control resin particles of  claim 1  wherein said charge control resin particles are solidified milled particles of a thermally kneaded product of the mixture of at least said charge control agent and said resin.  
     
     
         9 . The charge control resin particles of  claim 4  wherein said charge control resin particles are solidified milled particles of a thermally kneaded product of the mixture of at least said charge control agent and said resin.  
     
     
         10 . The charge control resin particles of  claim 1  wherein the mixing ratio by weight of the charge control agent and the resin is 1:9 to 9:1.  
     
     
         11 . The charge control resin particles of  claim 4  wherein the mixing ratio by weight of the charge control agent and the resin is 1:9 to 9:1.  
     
     
         12 . A toner for developing electrostatic images which comprises a coloring agent, a binder resin for toner, and charge control resin particles comprising a mixture of at least a charge control agent and a resin, wherein a crystalline zinc 3,5-di-tert-butylsalicylate represented by General Formula (1) below, and having major peaks of X-ray diffraction using the CuKα-characteristic X-ray at Bragg angles 20 of at least 6.4±0.2° and 15.4±0.2°, is contained as said charge control agent.  
       
         
           
           
               
               
           
         
       
       in Formula (1), t-Bu represents a tert-butyl group.  
     
     
         13 . The toner for developing electrostatic images of  claim 10  wherein said zinc 3,5-di-tert-butylsalicylate has major peaks of X-ray diffraction using the CuK α-characteristic X-ray at Bragg angles 2θ of at least 5.7±0.2°, 6.4±0.2° and 15.4±0.2°.  
     
     
         14 . The toner for developing electrostatic images of  claim 10  wherein said zinc 3,5-di-tert-butylsalicylate has major peaks of X-ray diffraction using the CuK α-characteristic X-ray at Bragg angles 2θ of at least 5.2±0.2°, 5.7±0.2°, 6.4±0.2°, 6.7±0.2° and 15.4±0.2°.  
     
     
         15 . A toner for developing electrostatic images which comprises a coloring agent, a binder resin for toner, and charge control resin particles comprising a mixture of at least a charge control agent and a resin, wherein a crystalline zinc 3,5-di-tert-butylsalicylate represented by General Formula (1) below, and having major peaks of X-ray diffraction using the CuK α-characteristic X-ray at Bragg angles 2θ of at least 7.7±0.2° and 15.7±0.2°, is contained as said charge control agent.  
       
         
           
           
               
               
           
         
       
       in Formula (1), t-Bu represents a tert-butyl group.  
     
     
         16 . A toner for developing electrostatic images comprising a charge control agent, a coloring agent and a binder resin for toner wherein a crystalline zinc 3,5-di-tert-butylsalicylate represented by General Formula (1) below, and having major peaks of X-ray diffraction using the CuK α-characteristic X-ray at Bragg angles 2θ of at least 5.2±0.2°, 6.7±0.2°, 7.7±0.2° and 15.7±0.2°, is contained as said charge control agent.  
       
         
           
           
               
               
           
         
       
       in Formula (1), t-Bu represents a tert-butyl group.