Toner comprising colorant wax dispersion

Patent metadata

Field	Value
Publication number	US-9639017-B2
Application number	US-201414256941-A
Country	US
Kind code	B2
Filing date	Apr 19, 2014
Priority date	Apr 19, 2014
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

A toner including a resin; and a colorant wax comprising a plurality of colorant wax particles comprising a colorant core surrounded by a wax shell, wherein the colorant wax particles exhibit a particle size distribution of from about 150 nanometers to less than about 300 nanometers; and wherein the colorant wax is prepared by (a) melting and mixing a dry colorant with at least one wax to form a colorant concentrate, wherein the colorant concentrate contains at least 25 percent by weight of colorant; (b) milling the colorant concentrate of step (a) to form a milled colorant concentrate; (c) combining the milled colorant concentrate of (b) with water and dispersing to form the plurality of colorant wax particles; wherein the melting and mixing of step (a) and the milling of step (b) is done in an immersion media mill; and wherein the combining of step (c) is done using a piston homogenizer.

First claim

The invention claimed is:

1. A toner comprising:
a resin; and
a colorant wax comprising a plurality of colorant wax particles comprising a pigment core surrounded by a wax shell, wherein the colorant wax particles exhibit a particle size distribution of from about 150 to about 300 nanometers with an average particle size of about 222 nanometers; and wherein the colorant wax is prepared by (a) melting and mixing a pigment colorant with at least one wax to form a colorant concentrate, wherein the colorant concentrate contains at least 25 percent by weight of colorant; (b) milling the colorant concentrate of step (a) to form a milled colorant concentrate; (c) combining the milled colorant concentrate of (b) with water and dispersing to form the plurality of colorant wax particles;
wherein the melting and mixing of step (a) and the milling of step (b) is done in an immersion media mill; and
wherein the combining of step (c) is done using a piston homogenizer.

2. The toner of claim 1 , wherein the resin is polyester.

3. The toner of claim 1 , wherein the resin is an amorphous polyester, a crystalline polyester, or a mixture thereof.

4. The toner of claim 1 , wherein the resin is selected from the group consisting of styrenes, acrylates, methacrylates, butadienes, isoprenes, acrylic acids, methacrylic acids, acrylonitriles, and combinations thereof.

5. The toner of claim 1 , wherein the resin is selected from the group consisting of poly(styrene-butadiene), poly(methyl methacrylate-butadiene), poly(ethyl methacrylate-butadiene), poly(propyl methacrylate-butadiene), poly(butyl methacrylate-butadiene), poly(methyl acrylate-butadiene), poly(ethyl acrylate-butadiene), poly(propyl acrylate-butadiene), poly(butyl acrylate-butadiene), poly(styrene-isoprene), poly(methylstyrene-isoprene), poly(methyl methacrylate-isoprene), poly(ethyl methacrylate-isoprene), poly(propyl methacrylate-isoprene), poly(butyl methacrylateisoprene), poly(methyl acrylate-isoprene), poly(ethyl acrylate-isoprene), poly(propyl acrylate-isoprene), poly(butyl acrylate-isoprene), poly(styrene-butylacrylate), poly(styrene-butadiene), poly(styrene-isoprene), poly(styrene-butyl methacrylate), poly(styrene-butyl acrylate-acrylic acid), poly(styrene-butadiene-acrylic acid), poly(styrene-isoprene-acrylic acid), poly(styrene-butyl methacrylate-acrylic acid), poly(butyl methacrylate-butyl acrylate), poly(butyl methacrylate-acrylic acid), poly(styrene-butyl acrylate-acrylonitrile-acrylic acid), poly(acrylonitrile-butyl acrylate-acrylic acid), and mixtures and combinations thereof.

6. The toner of claim 1 , wherein the resin is selected from the group consisting of amorphous polyester, crystalline polyester, or a mixture thereof;
a crystalline polyester formed by reacting one or more polyol branching monomers with a diacid or diester in the presence of an optional catalyst and a further organic diol suitable for forming the crystalline resin, wherein the further organic diol is selected from the group consisting of 1,2-ethanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 2,2-dimethylpropane-1,3-diol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,12-dodecanediol, and mixtures and combinations thereof, including their structural isomers; wherein the diacid or diester is selected from the group consisting of oxalic acid, succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, sebacic acid, fumaric acid, dimethyl fumarate, dimethyl itaconate, cis-1,4-diacetoxy-2-butene, diethyl fumarate, diethyl maleate, phthalic acid, isophthalic acid, terephthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, cyclohexane dicarboxylic acid, malonic acid, mesaconic acid, a diester or anhydride thereof, and mixtures and combinations thereof; and
an amorphous polyester formed by reacting one or more polyol branching monomers with a diacid or diester in the presence of an optional catalyst and a further organic diol suitable for forming the amorphous resin, wherein the diacid or diester is selected from the group consisting of terephthalic acid, phthalic acid, isophthalic acid, fumaric acid, trimellitic acid, dimethyl fumarate, dimethyl itaconate, cis-1,4-diacetoxy-2-butene, diethyl fumarate, diethyl maleate, maleic acid, succinic acid, itaconic acid, succinic acid, succinic anhydride, dodecylsuccinic acid, dodecylsuccinic anhydride, lutaric acid, glutaric anhydride, adipic acid, pimelic acid, suberic acid, azelaic acid, dodecanediacid, dimethyl terephthalate, diethyl terephthalate, dimethylisophthalate, diethylisophthalate, dimethylphthalate, phthalic anhydride, diethylphthalate, dimethylsuccinate, dimethylfumarate, dimethylmaleate, dimethylglutarate, dimethladipate, dimethyl dodecylsuccinate, and mixtures and combinations thereof;

wherein the further organic diol is selected from the group consisting of 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, pentanediol, hexanediol, 2,2-dimethylpropanediol, 2,2,3-trimethylhexanediol, heptanediol, dodecanediol, bis(hydroxyethyl)-bisphenol A, bis(2-hydroxypropyl)-bisphenol A, 1,4-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, xylenedimethanol, cycloheaxanediol, diethylene glycol, bis(2-hydroxyethyl)oxide, dipropylene glycol, dibutylene, and mixtures and combinations thereof.

7. The toner of claim 1 , wherein the wax is selected from the group consisting of polyolefins, carnauba wax, rice wax, candelilla wax, sumacs wax, jojoba oil, beeswax, montan wax, ozokerite, ceresin, paraffin wax, microcrystalline wax, Fischer-Tropsch wax, stearyl stearate, behenyl behenate, butyl stearate, propyl oleate, glyceride monostearate, glyceride distearate, pentaerythritol tetra behenate, diethyleneglycol monostearate, dipropyleneglycol distearate, diglyceryl distearate, triglyceryl tetrastearate, sorbitan monostearate, polyethylene wax, ester wax, amide wax, fatty acids, fatty alcohols, fatty amides, and combinations thereof.

8. The toner of claim 1 , wherein the colorant is a pigment selected from the group consisting of a magenta pigment, a cyan pigment, a yellow pigment, a black pigment, and mixtures and combinations thereof.

9. A toner comprising:
a resin; and
a colorant wax comprising a plurality of colorant wax particles comprising a pigment core surrounded by a wax shell, wherein the colorant wax particles exhibit a particle size distribution of from about 150 to about 300 nanometers with a Z average particle size of about 200 nanometers; and wherein the colorant wax is prepared by (a) melting and mixing a pigment colorant with at least one wax to form a colorant concentrate, wherein the colorant concentrate contains at least 25 percent by weight of colorant; (b) milling the colorant concentrate of step (a) to form a milled colorant concentrate; (c) combining the milled colorant concentrate of (b) with water and dispersing to form the plurality of colorant wax particles;
wherein the melting and mixing of step (a) and the milling of step (b) is done in an immersion media mill; and
wherein the combining of step (c) is done using a piston homogenizer.

Assignees

• Xerox Corp

Inventors

• Lee Frank Ping-Hay
• Veregin Richard P N
• Qiu Shigang S
• D'Amato Michael J
• Magdalinis Aurelian Valeriu
• Lawton David John William

Classifications

• G03G9/09392

  Preparation thereof · CPC title

• G03G9/0926

  characterised by physical or chemical properties · CPC title

• G03G9/0904

  Carbon black · CPC title

• G03G9/08755

  Polyesters · CPC title

• G03G9/0812 Primary

  Pretreatment of components · CPC title