Charge controlling method and developers containing a charge-exchange control agent comprising organic boron compound
AssigneeFuji Xerox Co., Ltd.
InventorsKen Hashimoto, Masayuki Maruta, Hidehiko Soyama, Yukihiro Ishii
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Abstract
A method for controlling charging of toner particles and/or charge-imparting materials used in electrophotography is disclosed, which comprises using as a charge-exchange control agent an organic boron compound composed of a boron-containing organic anion component and a cation component. A color developer containing the charge-exchange control agent is also disclosed, which is free from variation of tone and reduction of transparency due to the addition of the charge-exchange control agent.
Claims18
A method for controlling charging of toner particles by adding in the toner particles or in a charge-imparting material which is brought into contact with the toner particles and which has electrical influences on the toner particles upon contact therewith, or mixing with the toner particles externally an organic boron compound, as a charge-exchange control agent, composed of a boron-containing organic anion component selected from those represented by formulae (I)-1 to (I)-8 ##STR6## wherein R.sup.5 to R.sup.19 each represents a halogen atom, an alkyl group, a haloalkyl group, an aralkyl group, or an aryl group, R.sup.20 represents a hydrogen atom or an atom or group as defined for R.sup.5 to R.sup.19, and n.sub.1 to n.sub.4 each represents 0, 1, or 2, and a cation component selected from the group consisting of H.sup.+, alkali metal cations, alkaline earth metal cations, ammonium, quinolinium, imidazolium, sulfonium cations.
A toner composition for developing an electrostatic latent image, comprising toner particles and as a charge-exchange control agent an organic boron compound composed of a boron-containing organic anion component selected from those represented by formulae (I)-1 to (I)-8 ##STR8## wherein R.sup.5 to R.sup.19 each represents a halogen atom, an alkyl group, a haloalkyl group, an aralkyl group, or an aryl group, R.sup.20 represents a hydrogen atom or an atom or group as defined for R.sup.5 to R.sup.19, and n.sub.1 to n.sub.4 each represents 0, 1, or 2, and a cation component selected from the group consisting of H.sup.+, alkali metal cations, alkaline earth metal cations, ammonium, quinolinium, imidazolium, and sulfonium cations.
A developer composition for developing an electrostatic latent image, comprising carrier particles, toner particles, and as a charge-exchange control agent an organic boron compound composed of a boron-containing organic anion component selected from those represented by formulae (I)-1 to ##STR10## wherein R.sup.5 to R.sup.19 each represents a halogen atom, an alkyl group, a haloalkyl group, an aralkyl group, or an aryl group, R.sup.20 represents a hydrogen atom or an atom or group as defined for R.sup.5 to R.sup.19, and n.sub.1 to n.sub.4 each represents 0, 1, or 2, and a cation component selected from the group consisting of H.sup.+, alkali metal cations, alkaline earth metal cations, ammonium, quinolinium, imidazolium, and sulfonium cations.
Dependencies are inferred from the claim text.