US4371601A
Expired / Lapsed
US
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Positively charged developer compositions containing telomeric amines
Assignee: Xerox Corp
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Filing: 1981-05-01
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Granted: 1983-02-01
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Expires: 2001-05-01
Abstract
Abstract This invention relates to a positively charged dry developer composition comprised of resin particles, pigment particles, carrier particles, and a telomeric amine charge enhancing additive of the formula: [A.sub.x B.sub.y ].sub.Z wherein A is a segment that is soluble/dispersible in the resin particles, B is an amine segment, x and y are numbers representing mole fractions of A and B, the sum of x and y being equal to 1, and Z represents the degree of polymerization, wherein there results a telomeric amine having a number average molecular weight of from about 1,000 to about 10,000; and to a method for developing electrostatic latent images utilizing such compositions.
Inventors
- 👤 Roger N. Ciccarelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:43
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/0874; G03G9/08784; G03G9/08791; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
92 words
A positively charged dry developer composition comprised of resin particles, pigment particles, carrier particles, and a telomeric amine charge enhancing additive of the formula: [A.sub.x B.sub.y ].sub.Z wherein A is a segment that is soluble/dispersible in the resin particles, B is an amine segment, x and y are numbers representing mole fractions of A and B, the sum of x and y being equal to 1, and Z represents the degree of polymerization, wherein there results a telomeric amine having a number average molecular weight of from about 1,000 to about 10,000.
Claim 2
Dependent Claim
92 words
A positively charged dry developer composition comprised of resin particles, pigment particles, carrier particles, and a telomeric amine charge enhancing additive of the formula: [A.sub.x B.sub.y ].sub.Z wherein A is a segment that is soluble/dispersible in the resin particles, B is an amine segment, x and y are numbers representing mole fractions of A and B, the sum of x and y being equal to 1, and Z represents the degree of polymerization, wherein there results a telomeric amine having a number average molecular weight of from about 1,000 to about 10,000.
Claim 3
Dependent Claim
27 words
A positively charged dry developer composition in accordance with claim 1 wherein the ratio of x to y is 0.75:0.25, 0.96:0.04, 0.0:1.0, 9.0:1.0, or 9.8:0.2, 0.9:0.10, 0.98:002.
Claim 4
Dependent Claim
42 words
A positively charged developer composition in accordance with claim 1 wherein the resin is a styrene butylmethacrylate copolymer, or a styrene butadiene copolymer, the pigment is carbon black, and the carrier consists of a steel core coated a with vinylidene fluoride polymer.
Claim 5
Dependent Claim
48 words
A developer composition in accordance with claim 3 wherein the styrene butylmethacrylate is a styrene/n-butylmethacrylate, containing 65 percent by weight of styrene and 35 percent by weight of n-butylmethacrylate, and the styrene butadiene resin contains 90 percent by weight of styrene and 10 percent by weight of butadiene.
Claim 6
Dependent Claim
16 words
A positively charged developer composition in accordance with claim 1 wherein the telomeric amine is styrene/2-vinylpyridine.
Claim 7
Dependent Claim
17 words
A positively charged developer composition in accordance with claim 1 wherein the telomeric amine is a styrene/3-vinylpyridine.
Claim 8
Dependent Claim
16 words
A positively charged developer composition in accordance with claim 1 wherein the telomeric amine is styrene/4-vinylpyridine.
Claim 9
Dependent Claim
48 words
A method of imaging comprising forming a negative electrostatic image on a photoreceptor contained in an electrophotographic imaging system, contacting the image with the positively dry developer composition of claim 1, followed by subsequently transferring the developed latent image to a substrate and permanently affixing the image thereto.
Claim 10
Dependent Claim
78 words
A method of imaging in accordance with claim 8 wherein the ratio of x:y is 0.75:0.25, 0.96:0.04, 0.0:1.0, 0.90:1.10, or 0.98:0.02, the resin is a styrene/n-butylmethacrylate material, containing 58 percent by weight of styrene and 42 percent by weight of n-butylmethacrylate, or a styrene butadiene resin, containing 90 percent by weight of styrene and 10 percent by weight of butadiene, the colorant is carbon black, and the carrier consists of a steel core with a vinylidene fluoride polymer.
Claim 11
Dependent Claim
23 words
A method of imaging in accordance with claim 8 wherein the A segment is styrene and the B segment is a vinyl monomer.
Claim 12
Dependent Claim
15 words
A method of imaging in accordance with claim 8 wherein the telomeric amine is styrene/2-vinylpyridine.
Claim 13
Dependent Claim
15 words
A method of imaging in accordance with claim 8 wherein the telomeric amine is styrene/3-vinylpyridine.
Claim 14
Dependent Claim
15 words
A method of imaging in accordance with claim 8 wherein the telomeric amine is styrene/4-vinylpyridine.
Claim 15
Dependent Claim
28 words
A positively charged developer composition in accordance with claim 1 wherein the telomeric amine is present in an amount of from about 0.1 percent to about 15 percent.
Claim 16
Dependent Claim
41 words
A positively charged dry developer composition in accordance with claim 1 wherein the A segment is a vinyl monomer, an acrylate, or a methacrylate, and the B segment is an amine containing vinyl monomer, or amine acrylate or an amine methacrylate.
Claim 17
Dependent Claim
35 words
A positively charged dry developer composition in accordance with claim 15 wherein the vinyl monomer is selected from styrene or substituted styrenes, and the amine containing vinyl monomer is selected from vinylpyridine, or substituted vinylpyridines.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |