Cross-linked polymeric latex prepared with a low surface tension surfactant
A polymeric composition including a copolymer comprising a first monomer having a high carbon to oxygen ratio of from about 3 to about 8; a second monomer comprising two or more vinyl groups, wherein the second monomer is present in the copolymer in an amount of from greater than about 8 percent by weight to about 40 percent by weight, based on the weight of the copolymer; and optionally, a third monomer comprising an amine, wherein the third monomer is present in an amount of from about 0.1 percent by weight to about 1.5 percent by weight, based on the weight of the copolymer; and a surfactant, wherein the surfactant has a minimum surface tension at critical micelle concentration of less than about 30 mN/m. A toner including the copolymer as a toner surface additive. An emulsion aggregation toner process including the copolymer as a toner surface additive.
1. A toner comprising:
toner particles comprising at least one resin, in combination with an optional colorant, and an optional wax; and
a copolymer toner surface additive on at least a portion of an external surface of the toner particles, the copolymer toner surface additive comprising:
a first monomer having a high carbon to oxygen ratio of from about 3 to about 8;
a second monomer comprising two or more vinyl groups, wherein the second monomer is present in the copolymer in an amount of from greater than about 8 percent by weight to about 40 percent by weight, based on the weight of the copolymer; and
optionally, a third monomer comprising an amine, wherein the third monomer, if present, is present in an amount of from about 0.1 percent by weight to about 1.5 percent by weight, based on the weight of the copolymer; and
a surfactant, wherein the surfactant has a minimum surface tension at critical micelle concentration of less than about 30 mN/m;
wherein the copolymer toner additive has a volume average particle diameter of from about 20 nanometers to less than 50 nanometers.
2. The toner of claim 1 , wherein the surfactant has a minimum surface tension at critical micelle concentration of from about 15 to about 25 mN/m; or
where the critical micelle concentration cannot be reached, wherein the surfactant has a minimum surface tension of from about 15 to less than about 30 mN/m.
3. The toner of claim 1 , wherein the surfactant is a dodecylbenzene sulfonate.
4. The toner of claim 1 , wherein the surfactant is selected from the group consisting of ((CH 3 ) 3 SiO 2 ) 2 Si—(CH 3 )(CH 2 ) 3 (OCH 2 CH 2 ) n OH wherein n is from about 4 to about 12, oxyethylated alcohols, dimethyldidodecyl-ammonium bromide, perfluorocarboxylic acids and salts thereof, perfluoroalkanesulfonic acid salts, isostearyl sulphate salts, (CH 3 ) 3 CCH 2 CH(CH 3 )CH 2 PO 4 Na, dioctyl ammonium sulfosuccinate, dioctyl triethylamine sulfosuccinate, dioctyl trimethylamine sulfosuccinate, dioctyl tetrapropylammonium sulfosuccinate, and combinations thereof.
5. The toner of claim 1 , wherein the toner is free of titania surface additive; or
wherein the toner contains a titania surface additive in an amount of less than about 1 part per hundred by weight, based upon a total weight of the toner components.
6. The toner of claim 1 , wherein the toner contains at least one hydrophobic silica surface additive; and wherein the toner is free of titania surface additive; or
wherein the toner contains at least one hydrophobic silica surface additive; and wherein the toner contains a titania surface additive in an amount of less than about 1 part per hundred by weight, based upon a total weight of the toner components.
7. The toner of claim 1 , wherein the toner further contains at least one hydrophobic silica surface additive and a sol-gel silica surface additive.
8. The toner of claim 1 , wherein the toner further contains a second copolymer toner surface additive comprising an organic cross-linked surface additive having a volume average particle size (d50) of from about 70 nanometers to about 250 nanometers in diameter.
9. The toner of claim 1 , wherein the copolymer toner surface additive is present in an amount of from about 0.1 part per hundred to about 2 parts per hundred by weight based on 100 parts by weight of base toner particles.
10. The toner of claim 1 , wherein the copolymer toner surface additive has a volume average particle diameter of about 20 nanometers to less than 50 nanometers; and
wherein the copolymer toner surface additive is present in an amount of from about 0.1 part per hundred to about 2 parts per hundred by weight based on 100 parts by weight of base toner particles.
11. A toner process comprising:
contacting at least one resin; an optional wax; an optional colorant; and an optional aggregating agent;
heating to form aggregated toner particles;
optionally, adding a shell resin to the aggregated toner particles, and heating to a further elevated temperature to coalesce the particles;
adding a surface additive, wherein the surface additive comprises: a first monomer having a high carbon to oxygen ratio of from about 3 to about 8; a second monomer comprising two or more vinyl groups, wherein the second monomer is present in the copolymer in an amount of from greater than about 8 percent by weight to about 40 percent by weight, based on the weight of the copolymer; optionally, a third monomer comprising an amine, wherein the third monomer, if present, is present in an amount of from about 0.1 percent by weight to about 1.5 percent by weight, based on the weight of the copolymer; and a surfactant, wherein the surfactant has a minimum surface tension at critical micelle concentration of less than about 30 mN/m;
wherein the copolymer toner surface additive has a volume average particle diameter of from about 20 nanometers to less than 50 nanometers; and
optionally, recovering the toner particles.
12. The toner process of claim 11 , wherein the copolymer surface additive surfactant is a dodecylbenzene sulfonate.