Negative charge carrier resins with RH sensitivity

Patent metadata

Field	Value
Publication number	US-10268130-B2
Application number	US-201313917664-A
Country	US
Kind code	B2
Filing date	Jun 14, 2013
Priority date	Jun 14, 2013
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

The instant disclosure describes methacrylate coated carrier resins with hydrophobic substituents for charge control and improved RH sensitivity.

First claim

We claim:

1. A toner carrier composition comprising:
a polymer coating resin consisting of a methacrylate monomer having a hydrophobic substituent and a secondary aminoacrylate monomer, wherein the highest occupied molecular orbital (HOMO) of the methacrylate-containing polymer has greater than about 25% of the electron density of those molecular orbitals located on the hydrophobic substituent and less than about 75% of the electron density of those molecular orbitals on the carbonyl group of the methacrylate moiety, and wherein said methacrylate monomer having a hydrophobic substituent is present from about 98% to 100% by weight of the polymer and said secondary aminoacrylate monomer is present (a) from about 0.5 to about 1%; or (b) from about 1 to about 1.5; or (c) from about 1.5 to about 2% by weight of the polymer,
further wherein the methacrylate monomer has the formula as set forth in formula (I):

wherein Ar comprises at least one aromatic group, and
the secondary amino acrylate monomer is selected from the group consisting of dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, and diethylaminopropyl methacrylate; and
a carrier core particle, wherein the polymer coating resin adheres to a surface of the carrier core particle.

2. The Carrier composition of claim 1 , wherein the monomer exhibits increased delocalization of Fukui (−) function electron densities from the carbonyl group to the hydrophobic substituent as compared to methyl-containing, hexyl-containing or cyclohexyl-containing methacrylate polymers.

3. The carrier composition of claim 1 , wherein Ar is a benzyl group, a naphthyl group or a phenyl group.

4. The Carrier composition of claim 1 , wherein the methacrylate monomer has a carbon oxygen (C/O) ratio of 4.75 or more.

5. The carrier composition of claim 1 , wherein the secondary amino acrylate monomer is present at about 1% by weight of the polymer.

6. The carrier composition of claim 1 , wherein said methacrylate monomer has an improved charging RH ratio as compared to that of methylmethacrylate (MMA).

7. A developer comprising:
a carrier composition;
a toner;
and a toner surface additive;
wherein the carrier composition comprises a polymer coating resin consisting of a methacrylate monomer having a hydrophobic substituent and a secondary aminoacrylate monomer, wherein the highest occupied molecular orbital (HOMO) of the methacrylate-containing polymer has greater than about 25% of the electron density of those molecular orbitals located on the hydrophobic substituent and less than about 75% of the electron density of those molecular orbitals on the carbonyl group of the methacrylate moiety, and wherein said methacrylate monomer having a hydrophobic substituent is present from about 98% to 100% by weight of the polymer and said secondary aminoacrylate monomer is present (a) from about 0.5 to about 1%; or (b) from about 1 to about 1.5; or (c) from about 1.5 to about 2% by weight of the polymer,
further wherein the methacrylate monomer has the formula as set forth in formula (I):

wherein Ar comprises at least one aromatic group, and
the secondary amino acrylate monomer is selected from the group consisting of dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, and diethylaminopropyl methacrylate; and
a carrier core particle, wherein the polymer coating resin adheres to a surface of the carrier core particle.

8. The developer of claim 7 , wherein said at least one methacrylate monomer comprises a carbon:oxygen (C/O) ratio of 4.75 or greater.

9. The developer of claim 7 , wherein said toner surface additive comprises a silica, a titania, an alumina or mixtures thereof.

10. The developer of claim 9 , wherein said silica comprises at least one silica.

11. The developer of claim 7 , wherein an energy gap for forward charge transfer of electrons for said at least one methacrylate monomer and a toner surface additive is at less than about 5.1 eV.

12. The developer of claim 7 , wherein said toner comprises an emulsion aggregation toner.

13. The developer of claim 7 , wherein Ar comprises a benzyl group or a phenyl group.

14. The developer of claim 7 , wherein the secondary amino acrylate monomer is present at about 1% by weight of the polymer.

15. The developer of claim 7 , wherein said at least one methacrylate monomer comprises an improved charging RH ratio as compared to that of methylmethacrylate (MMA).

Assignees

• Xerox Corp
• Nat Res Council Canada

Inventors

• Veregin Richard P N
• Li Qingbin
• Kovalenko Andriy
• Gusarov Sergey
• Vanbesien Daryl W
• Hawkins Michael S

Classifications

• G03G9/1133 Primary

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• G03G9/0823

  Electric parameters · CPC title

• G03G9/10 Primary

  characterised by carrier particles · CPC title