Pressure fixing toner and preparation method thereof
A pressurized fixing and toner technology, which is applied in the directions of developer, electrography, optics, etc., can solve problems such as difficulty in controlling particle size distribution, toner quality reproducibility, low energy efficiency, and difficulty in high-speed printing of toner
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[0038] The preparation method of the pressure-fixing toner is explained step by step as follows.
[0039] In the above preparation method, a wax mixture comprising wax, pigment and selected additives is first formed, and the wax mixture is added to an aqueous medium. Here, the aqueous medium for dispersing the wax mixture may be obtained by dissolving in water a dispersion stabilizer by which the wax mixture can maintain a stable dispersion state in the aqueous medium. As the dispersion stabilizer, calcium phosphate, silica / polyvinylpyrrolidone complex, magnesium hydroxide or hydroxyapatite, etc. can be used, and the amount of the dispersion stabilizer can be about 1 to 10 parts by weight , preferably 2 to 8 parts by weight and more preferably 3 to 7 parts by weight, based on 100 parts by weight of the water. Therefore, the wax mixture can maintain a stable dispersion state in the aqueous medium and the dispersion stabilizer can be easily removed later.
[0040] In addition,...
Embodiment 1
[0055] (Preparation of Toner)
[0056] The aqueous dispersion was prepared by adding 5 parts by weight of calcium phosphate as a dispersion stabilizer to 400 parts by weight of ion-exchanged water, stirring at room temperature for 10 minutes, raising the temperature to 70° C. and stirring for another 20 minutes.
[0057] After 82 parts by weight of a paraffin-based wax was heated to 70° C. by using a water bath, the wax mixture was added thereto by adding 4 parts by weight of a pigment and 4 parts by weight of a sulfonic acid group-containing styrene-acrylic polymer as a charge control agent and It is prepared by stirring at high speed.
[0058] The wax mixture was added to the aqueous dispersion and dispersed in the form of small droplets by homogenizing it using a homogenizer at a speed of 13000 rpm. Subsequently, 7.5 parts by weight of styrene, 2.5 parts by weight of n-butyl acrylate, and 0.3 parts by weight of azobisisobutyronitrile were mixed while stirring at 200 rpm us...
Embodiment 2
[0065] The pressure-fixing toner of Example 2 was prepared basically in the same manner as in Example 1, except that the wax was used in an amount of 72 parts by weight, and 15 parts by weight of styrene, 5 parts by weight of n-butyl acrylate and 0.7 parts by weight of azobisisobutyronitrile was used in addition to shell formation. By determining the composition of the toner particles contained in the press-fixed toner in the same manner as in Example 1, it can be seen that the toner of Example 2 includes 80 parts by weight of the wax mixture constituting the core and 20 parts by weight Parts of a shell comprising a polymer substance, the wax mixture comprising 72 parts by weight of a wax, 4 parts by weight of a pigment and 4 parts by weight of a charge control agent, the shell comprising 19.7 parts by weight of a polymer substance and 0.3 parts by weight of Other residues (remaining monomers, initiators, etc.) are based on 100 parts by weight of the toner as a whole.
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