Non-aqueous dispersing agent and liquid developing agent for electrostatic photography
Patent 5085966 Issued on February 4, 1992. Estimated Expiration Date: 
September 28, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 28, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesLiquid developer for electrostatic photography Liquid developer for electrostatic photography Liquid developers for electrophotography Patent #: 4983486 InventorsApplicationNo. 589577 filed on 09/28/1990US Classes:430/115, Identified adjuvant, i.e., surfactant, etc.430/114Identified toner, i.e., identified resin coated pigment, etc.ExaminersPrimary: Martin, RolandAttorney, Agent or FirmForeign Patent References
International ClassG03G 009/135Foreign Application Priority Data1989-09-28 JPAbstractA non-aqueous dispersing agent comprising a graft copolymer is characterized in that monomer(s) to constitute the graft portion(s) of the graft copolymer is (are) at least one or more macromonomers each having a terminal polymerizable functional group and that the graft copolymer is substantially soluble in a high electric-resistance non-aqueous solvent having a dielectric constant of 3 or less and a volume specific resistance of 109 Ωcm of more. The dispersing agent may sufficiently disperse any of a colorant of pigment or dye, a fixing resin-coated colorant or a fixing resin itself by wet-dispersion, and it has an excellent storage stability. The agent is therefore useful in a liquid developer for electrostatic photography or in a liquid developer for preparing printing plates. |
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