Method for making emulsion aggregation particles using core-shell polymer nanoparticles
A nanoparticle and emulsion aggregation technology, applied in the direction of instruments, developers, optics, etc., can solve the problem of poor charge retention A-region charge and so on
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Embodiment I
[0080] Embodiment 1. is prepared by phase inversion method comprising poly(propoxylated bisphenol co-fumaric acid ester) amorphous polyester resin nanoparticles
[0081] To a 1 liter vessel equipped with an oil bath, a distillation apparatus and a mechanical stirrer was added approximately 200 grams of an amorphous resin, poly(propoxylated bisphenol co-fumarate), obtained from Kao Corporation, showing approximately 56.7°C The glass transition temperature, the acid value of about 16.8 and the softening point of about 109 ℃. Add about 125 grams of methyl ethyl ketone and about 15 grams of isopropanol to the resin. The mixture was stirred at about 350 revolutions per minute (rpm), heated to about 45°C over about 30 minutes, and held at about 45°C for about an additional 3 hours, whereby the resin dissolved to give a clear solution. About 10.2 grams of ammonium hydroxide was then added dropwise to the solution over about two minutes, and after stirring at about 350 rpm for ab...
Embodiment II
[0082] Example II. Preparation of a crystalline resin comprising about 80% by weight, poly(1,12-dodecanoic acid -1,9-nonanediate) as the core, and about 20 wt% amorphous resin, its poly(propoxylated-ethoxylated bisphenol-A-fumarate) copoly(propoxylated-ethoxylated bisphenol-co-dodecylsuccinate) Core-shell nanoparticles as shells
[0083] To a 1-liter kettle equipped with an oil bath, a distillation unit and a mechanical stirrer was added about 100 grams of Copolymer Copolymer, which was obtained from Kao Corporation and exhibited a glass transition temperature of about 59°C, an acid value of about 14, and a softening point temperature of about 112°C. (propoxylated-ethoxylated bisphenol-A-fumarate)co(propoxylated-ethoxylated bisphenol-A-fumarate), and about 100 grams of poly(1 , 12-dodecanoic acid-1,9-nonanediate). Add about 140 grams of methyl ethyl ketone and about 15 grams of isopropanol to the resin. The mixture was stirred at about 350 revolutions per minute (rpm)...
Embodiment III
[0084] Example III. Toner comprising about 5 wt% Pigment Blue 15:3, core comprising about 50 wt% of the core-shell nanoparticles of Example II, and about 17 wt% of the amorphous Nanoparticles, and shell comprising 28 wt% of the amorphous nanoparticles of Example 1
[0085] Add about 137 grams of the core-shell emulsion of Example II above, about 46.6 grams of the amorphous emulsion of Example I, about 600 grams of water, about 24.4 grams of Cyan Pigment Blue 15:2 dispersion (17 solid %, purchased from Sun Chemicals), and about 2.4 g surfactant (about 47.5% in water), and the mixture was stirred at about 100 rpm. About 65 grams of about 0.3 N nitric acid solution was then added to the mixture until the pH reached about 3.7, followed by homogenization at about 2,000 rpm, and then about 0.2 ppH of aluminum sulfate, with the homogenizer speed reduced at the end of the aluminum sulfate addition. Increase to about 4,200 rpm so that the pH of the mixture is about 3.1. The mi...
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