Electrophotographic imaging apparatus and toner

Abstract

This invention uses a toner which has |x|≧60, wherein a blow-off charge level is defined as x[μc/g], or a toner which has 11.0≦log ρ, wherein a volume intrinsic electric resistivity is defined as ρ[μc/g]. Alternatively, this invention uses a capsulated toner consisting of a core and a shell resin enclosing the outer of the core, characterized in that the shell resin does not comprise a charge control agent (CCA) for controlling a charge level, but the core only comprises said CCA.

1. An electrophotographic imaging apparatus with a one-element developing system, comprising:
 a toner having a core and a shell layer enclosing the core, the core and the shell layer each comprising a composite resin having a Tg, wherein the lowest Tg among Tgs of the composite  resins of the toner is below 60° C.;  
 an image carrier; and  
 a member with high water repellency, contacting the image carrier to electrify the image carrier, wherein the water repellency of the member provides a contact angle of more than 90° with pure water.  
 
     
     
       2. An electrophotographic imaging apparatus with one-element developing system according to  claim 1 , further comprising a toner recycling system and a cleaning means that recovers a transferring residual toner, the toner recycling system recycling the transferring residual toner upon deposition of the toner on a latent image to form a toner image. 
     
     
       3. The toner cartridge wherein the toner according to  claim 1  is stored. 
     
     
       4. The developing unit wherein the toner cartridge according to  claim 3  is supplied. 
     
     
       5. An electrophotographic imaging apparatus with one-element developing system according to  claim 1 , wherein the toner has a blow-off charge level whose absolute value is at least 60 μc/g. 
     
     
       6. An electrophotographic imaging apparatus with one-element developing system according to  claim 1 , wherein the toner is a capsulated toner consisting of the core and the shell layer enclosing the core, wherein the core includes a charge control agent and the shell layer excludes any charge control agent. 
     
     
       7. An electrophotographic imaging apparatus with one-element developing system according to  claim 1 , wherein the toner is a capsulated toner consisting of the core and the shell layer enclosing the core, wherein the shell layer has between 0.1 and 4 parts of resin for each part of the resin in the core. 
     
     
       8. An electrophotographic imaging apparatus with one-element developing system according to  claim 1 , wherein the wherein the composite resin of the toner having the lowest Tg among Tgs is the composite resin of the core. 
     
     
       9. An electrophotographic imaging apparatus according to  claim 1 , wherein the contact angle is interior angle taken by a droplet of pre  pure water on the member and is the angle of the tangent to the droplet with respect to the surface of the member, at a contacting edge between the droplet and the member. 
     
     
       10. An electrophotographic imaging apparatus as set forth in  claim 9 , wherein the size of the droplet is 2 mm before dropping the same on the member. 
     
     
       11. An electrophotographic imaging apparatus with a one- element developing system, comprising:      a toner having a core and a shell layer enclosing the core, wherein the core comprises an easy - melting material and the shell layer comprise a hard - melting material;        an image carrier; and        a member with a high water repellancy that provides a contact angle of more than  90 ° with pure water.     
     
     
       12. An electrophotographic imaging apparatus with a one- element developing system, comprising:      a toner having a core and a shell layer enclosing the core, at least one of the core and the shell layer comprising a material having a glass transition temperature below  60 ° C.;        an image carrier; and        a member with a high water repellancy, contacting the image carrier to electrify the image carrier, wherein the water repellency of the member provides a contact angle of more than  90 ° with pure water.     
     
     
       13. An electrophotographic imaging apparatus with one- element developing system according to    claim 12   , further comprising a toner recycling system and a clearing means that recovers a transferring residual toner, the toner recycling system recycling the transferring residual toner upon deposition of the toner on a latent image to form a toner image.   
     
     
       14. The toner cartridge wherein the toner according to  claim 12  is stored. 
     
     
       15. The developing unit wherein the toner cartridge according to  claim 14  is supplied. 
     
     
       16. An electrophotographic imaging apparatus with one- element developing system according to    claim 12   , wherein the toner has a blow - off charge level whose absolute value is at least  60  μc/g.   
     
     
       17. An electrophotographic imaging apparatus with one- element developing system according to    claim 12   , wherein the toner is a capsulated toner consisting of the core and the shell layer enclosing the core, wherein the core includes a charge control agent and the shell layer excludes any charge control agent.   
     
     
       18. An electrophotographic imaging apparatus with one- element developing system according to    claim 12   , wherein the toner is a capsulated toner consisting of the core and the shell layer enclosing the core, wherein the shell layer has between  0 . 1  and  4  parts of resin for each part of resin in the core.   
     
     
       19. An electrophotographic imaging apparatus with one- element developing system according to    claim 12   , wherein the material of the core having the glass transition temperature is a resin.   
     
     
       20. An electrophotographic imaging apparatus according to  claim 12 , wherein the contact angle is an interior angle taken by a droplet of pure water on the member and is the angle of the tangent to the droplet with respect to the surface of the member, at a contacting edge between the droplet and the member. 
     
     
       21. An electrophotographic imaging apparatus as set forth in  claim 20 , wherein the size of the droplet is  2  mm before dropping the same on the member. 
     
     
       22. An electrophotographic imaging apparatus with a one- element developing system, comprising:      a toner having a core and a shell layer enclosing the core, wherein the core comprises an easy - melting material and the shell layer comprise a hard - melting material;        an image carrier; and        a member with a high water repellency contacting the image carrier to electrify the image carrier, wherein the water repellency of the member provides the member with a contact angle of more than  90 ° with pure water.