Compounds and methods of forming compounds useful as a toner
View Patent ↗Compounds and methods of forming compounds useful as a toner or toner precursor are disclosed. The compounds may include an aqueous dispersion, the dispersion including: (A) at least one thermoplastic resin; and (B) 0 to 5 weight percent of a stabilizing agent, based on the total weight of (A) and (B). The dispersion may have an average volume diameter particle size from about 0.05 to about 10 microns. A combined amount of the thermoplastic resin and the stabilizing agent may have an acid number of less than 25 mg KOH/g.
1. A compound comprising:
an aqueous dispersion, the dispersion comprising water and:
(A) at least one thermoplastic resin; and
(B) 0 to 5 weight percent of a stabilizing agent, based on the total weight of (A) and (B);
(C) at least one of an internal additive and an external additive; and
(D) a neutralizing agent, wherein the neutralizing agent is present in an amount sufficient to neutralize less than 90% on a molar basis of any acid groups in components (A) and (B) and wherein the neutralizing agent is selected from the group consisting of primary amines, secondary amines, tertiary amines, or combinations of two or more of thereof, wherein the primary amines are selected from the group consisting of monoethanolamine, monomethylamine, monoethylamine, mono-n-propylamine, N-methanol amine, monoisopropanolamine, 2-amino-2-methyl-1-propanol, and tris(hydroxymethyl)-aminomethane, the secondary amines are selected from the group consisting of diisopropanolamine, diethanolamine, dimethylamine, diethylamine, and N-aminoethylethanolamine, and the tertiary amines are selected from the group consisting of triethanolamine, triisopropanolamine, N, N-dimethylethanolamine, trimethylamine, triethylamine, dimethyl-n propylamine, N-methyldiethanolamine, N,N-dimethyl propanolamine, and N,N,N′N′-tetrakis(2-hydroxylpropyl)ethylenediamine;
wherein the dispersion comprises particles having an average volume diameter particle size from about 0.05 to about 10 microns; and
wherein a combined amount of the thermoplastic resin and the stabilizing agent has an acid number of less than 25 mg KOH/g.
2. The compound of claim 1 , wherein the internal additive comprises at least one of a wax, a colorant, a charge control agent, and a magnetic additive.
3. The compound of claim 2 , wherein the colorant comprises at least one pigment.
4. The compound of claim 3 , wherein the pigment comprises at least one of a raw pigment, a treated pigment, a pre-milled pigment, a pigment powder, a pigment presscake, a pigment masterbatch, a recycled pigment, and a solid or liquid pigment predispersion.
5. The compound of claim 1 , wherein the external additive comprises at least one of a charge control agent, an auxiliary fine particle, a polishing agent, a lubricant, and a wax.
6. The compound of claim 1 , wherein the thermoplastic resin is at least one selected from the group consisting of homopolymers, copolymers, and elastomers of an alpha-olefin, copolymers and elastomers of an alpha-olefin with a conjugated or non-conjugated diene, ethylene-vinyl compound copolymers, styrenic copolymers, styrene block copolymers and elastomers, polyvinyl compounds, polymethyl acrylate, and polymethyl methacrylate, polyamides, thermoplastic polyesters, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, and polyphenylene oxide.
7. The compound of claim 1 , wherein the thermoplastic resin is at least one of polyesters, styrene copolymers, ethylene-propylene copolymers, and dicyclopentadiene polymers.
8. The compound of claim 1 , wherein the thermoplastic resin comprises an ethylene-based homopolymer, copolymer, interpolymer, or multi-block interpolymer, a propylene-based homopolymer, copolymer, interpolymer, or multi-block interpolymer, or combinations thereof.
9. The compound of claim 1 , wherein the thermoplastic resin comprises at least one polyester formed by reacting an aliphatic diol with an alkanedioic acid.
10. The compound of claim 9 , wherein the aliphatic diol comprises at least one of cis-1,3-cyclohexanedimethanol, trans-1,3-cyclohexanedimethanol, cis-1,4-cycloexanediethanol, and trans-1,4-cyclohexanedimethanol.
11. The compound of claim 1 , wherein components A and B together are present in an amount of 45-99% by weight, based on a total weight of the dispersion.
12. A method for forming a toner, the method comprising:
forming a compound, the compound comprising:
an aqueous dispersion, the aqueous dispersion comprising water and:
(A) a thermoplastic resin; and
(B) 0 to 5 weight percent of a stabilizing agent, based on the total weight of (A) and (B); and
(C) a neutralizing agent, wherein the neutralizing agent is present in an amount sufficient to neutralize less than 90% on a molar basis of any acid groups in components (A) and (B) and wherein the neutralizing agent is selected from the group consisting of primary amines, secondary amines, tertiary amines, and combinations of two or more thereof, wherein the primary amines are selected from the group consisting of monoethanolamine, monomethylamine, monoethylamine, mono-n-propylamine, N-methanol amine, monoisopropanolamine, 2-amino-2-methyl-1-propanol, and tris(hydroxymethyl)-aminomethane, the secondary amines are selected from the group consisting of diisopropanolamine, diethanolamine, dimethylamine, diethylamine, and N-aminoethylethanolamine, and the tertiary amines are selected from the group consisting of triethanolamine, triisopropanolamine, N, N-dimethylethanolamine, trimethylamine, triethylamine, dimethyl-n propylamine, N-methyldiethanolamine, N,N-dimethyl propanolamine, and N,N,N′N′-tetrakis(2-hydroxylpropyl)ethylenediamine;
wherein the aqueous dispersion comprises particles having an average volume diameter particle size from about 0.05 to about 2 microns; and
wherein a combined amount of the thermoplastic resin and the stabilizing agent has an acid number of less than 25 mg KOH/g; and
forming toner using at least a portion of the compound;
wherein the forming the compound comprises: melt kneading the thermoplastic resin and optionally an internal additive in a melt kneader to form a resin melt.
13. The method of claim 12 , further comprising admixing an external additive with the aqueous dispersion.
14. The method of claim 12 , wherein the method is substantially organic solvent-free.
15. The method of claim 12 , further comprising aggregating the dispersion particles to form aggregate particles.
16. The method of claim 15 , further comprising coalescing the aggregate particles.
17. The method of claim 16 , further comprising at least one of: removing at least a portion of the water from the compound; filtering at least one of the compound, the dispersion particles, and the coalesced aggregate particles; classifying at least one of the compound, the dispersion particles, and the coalesced aggregate particles; washing at least one of the coalesced aggregate particles and the dispersion particles; and post-treating the toner particles.
18. The method of claim 12 , wherein the aqueous dispersion further comprises at least one of an internal additive, and an external additive.