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Developer compositions containing quaternized vinylpyridine polymers, and copolymers
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Inventors: Lu, Chin H.;
Assignee: Xerox Corporation (Stamford, CT)
Primary Examiner: Kittle; John E.
Assistant Examiner: Goodrow; John L.
Attorney, Agent or Firm: Palazzo; E. O.
This invention relates to an electrostatic developer composition comprised of resin particles, pigment particles, carrier particles, and a charge enhancing component comprised of a partially quaternized vinylpyridinium polymer or copolymer selected from the group consisting of those materials of the following formula: ##STR1## wherein R is an alkyl radical, A is an anion, B is an alkyl group or hydrogen, S is an acrylate, phenyl, halogen or cyano radical, x, y, u, v, w represent weight fraction numbers, subject to the provision that the sum of x and y is equal to 1, and the sum of u, v, and w is equal to 1, which compositions are useful in causing the development of images in electrostatographic imaging systems. |
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DETAILED DESCRIPTION What is claimed is: 1.
A positively charged dry developer composition comprised of resin particles, pigment particles, carrier particles, and a charge enhancing component comprised of partially quaternized vinylpyridinium polymer or copolymer selected from the group consisting of those materials of the following formula: ##STR6## wherein R is an alkyl radical, A is an anion, B is an alkyl radical or hydrogen, S is an acrylate, phenyl, halogen, or cyano radical, x, y, u, v, w represent weight fraction numbers, subject to the provision that the sum of x and y is equal to 1, and the sum of u, v, and w is equal to 1.
2.
A developer composition in accordance with claim 1 wherein R is an alkyl radical containing from 1 carbon atom, to about 6 carbon atoms, and the anion A is selected from halides, sulfate, sulfonate, borate, nitrate, or phosphate.
3.
A developer composition in accordance with claim 1 wherein the resin is a styrene/n-butyl methacrylate copolymer material, the pigment is carbon black, R is methyl, S is acrylate, and A is a halogen anion.
4.
A developer composition in accordance with claim 1 wherein the charge enhancing component is poly(2-vinylpyridine) partially quaternized with isopropyl bromide.
5.
A developer composition in accordance with claim 1 wherein the charge enhancing component is poly(4-vinylpyridine) partially quaternized with n-butyl bromide.
6.
A developer composition in accordance with claim 1 wherein the charge enhancing component is poly(4-vinylpyridine/styrene) partially quaternized with n-butyl bromide.
7.
A developer composition in accordance with claim 1 wherein the partially quaternized vinyl pyridinium polymer and copolymer are present in the range of from about 0.
1 percent to about 98 percent, and the pigment is present in the range of from about 2 percent to about 20 percent.
8.
A developer composition in accordance with claim 1 wherein the carrier particles are comprised of a steel core coated with a vinylidene fluoride polymer or a perfluoroalkoxy fluoro polymer
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Molecular Biology 
