Liquid developer for electrophotography, process for producing the same, and process for image formation using the same

  • US 5,622,804 A
  • Filed: 04/14/1995
  • Issued: 04/22/1997
  • Est. Priority Date: 05/30/1994
  • Status: Expired due to Fees
First Claim
Patent Images

1. A liquid developer for electrophotography which comprises a carrier comprising at least one ether compound, a charge director contained in the carrier, and toner particles dispersed in the carrier and having a volume-average particle diameter of from 0.5 μ

  • m to 5 μ

    m, wherein said toner particles comprise a thermoplastic resin substantially insoluble in the carrier at a temperature used for development, a colorant dispersed in the resin, and a charge control agent,wherein said ether compound is represented by general formula;

    
    
    space="preserve" listing-type="equation">R.sub.1 O(C.sub.n H.sub.2n O).sub.x R.sub.2wherein R1 and R2 may be the same or different and each represent an alkyl group, a cycloalkyl group, an aryl group, or an aralkyl group, provided that the total number of carbon atoms contained in R1 and R2 is from 6 to 20;

    n is an integer of 2 or 3; and

    x is an integer of 0 to 3, andwherein said resin is selected from the group consisting of polyolefins, ethylene copolymers having a polar group, homopolymers of styrene, styrene-acrylic copolymers, polyesters and polyurethanes.

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