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Dyed stabilized liquid developer and method for making
| Details |
Inventors: Croucher, Melvin D.; Duff, James M.; Hair, Michael L.; Lok, Kar P.; Wong, Raymond W.;
Assignee: Xerox Corporation (Stamford, CT)
Primary Examiner: Kittle; John E.
Assistant Examiner: Goodrow; John L.
Attorney, Agent or Firm:
A stable colored liquid developer and method for making such are described wherein an improved optical density resulting from a colored dye being imbibed into a thermoplastic resin core occurs. In particular, the liquid developer comprises a marking particle dispersed in an aliphatic dispersion medium, the marking particle comprises a thermoplastic resin core having an amphipathic block or graft copolymeric steric stabilizer irreversibly chemically or physically anchored to the thermoplastic resin core with the dye being imbibed in the resin core and being soluble therein and insoluble in the dispersion medium. The stable colored liquid developer is preferably made by first preparing a graft or block copolymer amphipathic steric stabilizer, anchoring said stabilizer to a thermoplastic resin core, and to the aliphatic disperion of said particle adding a solution of a dye dissolved in a polar solvent, preferrably methanol, the dye being soluble in the thermoplastic resin core to enable it to be imbibed therein and substantially insoluble in the dispersion medium. |
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DETAILED DESCRIPTION What is claimed is: 1.
A stable colored liquid developer comprising an insulating liquid dispersion medium having dispersed therein a marking particle comprising a thermoplastic resin core substantially insoluble in said dispersion medium, an amphipathic block or graft copolymeric steric stabilizer irreversibly chemically or physically anchored to said thermoplastic resin core, said steric stabilizer being soluble in said dispersion medium and a colored dye imbibed in the thermoplastic resin core, said dye being soluble in said thermoplastic resin core and insoluble in said dispersion medium.
2.
The stable liquid developer according to claim 1, wherein said insulating liquid dispersion medium comprises an aliphatic hydrocarbon having a resistivity greater than about 10.
sup.
9 ohm cm.
3.
The stable liquid developer according to claim 1, wherein said thermoplastic resin cores are substantially monodispersed particles having a diameter from about 0.
1 micron to about 1.
0 micron.
4.
The stable liquid developer according to claim 1, wherein said colored dye is substantially insoluble in water, soluble in a polar solvent and substantially insoluble in the aliphatic dispersion medium.
5.
The stable liquid developer according to claim 1, further including a charge control agent soluble in said liquid dispersion medium.
6.
The stable liquid developer according to claim 1, wherein said core comprises a homopolymer of N-vinyl-2-pyrrolidone, vinyl acetate or ethyl acrylate monomer or a copolymer of said monomers.
7.
The stable liquid developer of claim 1, wherein said amphipathic steric stabilizer comprises a graft copolymer which has a backbone portion soluble in said dispersion medium and a portion insoluble in said dispersion medium which has an affinity for the resin core.
8.
The stable liquid developer of claim 1, wherein said soluble backbone portion is a poly(alkyl acrylate) or a poly(alkyl methacrylate), the alkyl group having at least three carbons.
9.
The stable liquid developer of claim 8, wherein said amphipathic steric stabilizer is a graft copolymer of poly(2-ethylhexyl methacrylate) or poly(2-ethylhexyl acrylate) solution grafted with N-vinyl-2-pyrrolidone, vinyl acetate or ethyl acrylate
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Molecular Biology 
