Chemically prepared toners with size limiting binders
View Patent ↗Chemically prepared toner is manufactured by aggregation in which the binder resin is a latex copolymer having a methacrylic acid ester of long chain, saturated alkyl, which may be lauryl methacrylate. This binder resin has a small amount by weight of acrylic acid component and has other nonionic components, which may be styrene and butyl acrylate moieties. Aggregation is carried out in an aqueous medium, which may have organic solvent components. The aggregation is then heated, and because of the selection of the binder resin to have the long chain ester, the heating step has minimal effect on particle size.
1. A process for manufacturing chemically prepared toner by aggregation in an aqueous medium comprising:
combining lauryl methacrylate, acrylic acid moiety, a non-ionic monomer and a colorant materials and forming a latex in aqueous medium;
aggregating upon addition of acid and forming toner particles having a particle size;
heating said aggregated latex, wherein said heating does not have any further effect on particle size growth.
2. The process of claim 1 wherein said aqueous medium contains an organic solvent.
3. The process of claim 2 wherein said organic solvent is propanol.
4. The process of claim 1 wherein said latex comprises at least 5 percent by weight lauryl methacrylate based on the weight of the latex.
5. The process of claim 1 wherein said latex comprises about 1.0 percent by weight acrylic acid moiety, based upon the weight of said latex.
6. The process of claim 1 wherein said non-ionic monomer comprises styrene or butyl acrylate.
7. The process of claim 1 wherein said acrylic acid moiety comprises methacrylic acid.
8. The process of claim 1 wherein said toner particles formed upon aggregation have a volume particle size of 7.46 microns.
9. The process of claim 1 wherein said toner particles formed upon aggregation have a volume particle size of 9.37 microns.
10. The process of claim 1 wherein said acid for aggregation comprises nitric acid.
11. A process for manufacturing chemically prepared toner by aggregation in an aqueous medium comprising:
combining lauryl methacrylate, acrylic acid moiety, a non-ionic monomer and a colorant materials and forming a latex in aqueous medium containing organic solvent, wherein said lauryl methacrylate is present at a level of at least 5 percent by weight of said latex;
aggregating upon addition of acid and forming toner particles having a particle size;
heating said aggregated latex, wherein said heating does not have any further effect on particle size growth.