Toner for development of electrostatic images
An electrostatic image development and toner technology, which is applied in the direction of developer, electrography, instrument, etc., can solve the problems of external additive embedding, easy generation of fog, and failure to maintain the initial charge, etc., to achieve excellent printing durability, The effect of excellent stability of delivery volume
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[0037] (A-1) Preparation process of polymerizable monomer composition
[0038] First, a polymerizable monomer composition is prepared by mixing a polymerizable monomer, a colorant, a charge control resin, a softener, and if necessary, other additives such as a fixing aid. When preparing the polymerizable monomer composition, mixing is performed using, for example, a media type disperser.
[0039] In the present invention, a polymerizable monomer refers to a monomer having a polymerizable functional group, and the polymerizable monomer is polymerized to form a binder resin. As the main component of the polymerizable monomer, a monovinyl monomer is preferably used. Examples of monovinyl monomers include styrene; styrene derivatives such as vinyltoluene and α-methylstyrene; acrylic acid and methacrylic acid; methyl acrylate, ethyl acrylate, propyl acrylate, acrylic acid Acrylates such as butyl, 2-ethylhexyl acrylate, and dimethylaminoethyl acrylate; methyl methacrylate, ethyl m...
Embodiment 1
[0188] (1) Synthesis of electrification control resin
[0189] Add 60 parts of methanol, 20 parts of toluene, 99.5 parts of methyl methacrylate, 0.5 parts of dimethylaminoethyl benzyl methacrylate chloride, and 0.2 parts of azobisbis Methylvaleronitrile was reacted at 60°C for 12 hours while stirring. Next, the solvent was removed by distillation under reduced pressure to obtain a charge control resin 1 comprising a quaternary ammonium base-containing copolymer having a Tg=83°C.
[0190] (2) Production of toner for electrostatic image development
[0191] Using a media-type wet pulverizer, 70 parts of styrene as a monovinyl monomer, 30 parts of n-butyl acrylate, and 7 parts of carbon black (trade name: #25B, manufactured by Mitsubishi Chemical Corporation) as a black colorant were mixed. ), 0.7 parts of divinylbenzene as a cross-linking polymerizable monomer, and 1.0 parts of tert-dodecyl mercaptan as a molecular weight regulator are wet-milled, and then 1.5 parts of The ch...
Embodiment 2
[0198] (1) Synthesis of electrification control resin
[0199] Add 60 parts of methanol, 20 parts of toluene, 99.7 parts of methyl methacrylate, 0.3 parts of dimethylaminoethylbenzyl methacrylate chloride, and 0.2 parts of azobis Dimethylvaleronitrile was reacted at 60°C for 12 hours while stirring. Next, the solvent was removed by distillation under reduced pressure to obtain a charge control resin 2 comprising a quaternary ammonium base-containing copolymer having a Tg=82°C.
[0200] (2) Production of toner for electrostatic image development
[0201] The electrostatic image developing toner of Example 2 was produced in the same manner as in Example 1 except that 3.0 parts of the charge control resin 2 obtained in the above (1) was added.
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Abstract
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