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US4374192A
Expired / Lapsed
US
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Carrier coating compositions of butadiene-acrylonitrile rubber and polyurethane
Assignee: Ricoh Co Ltd
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Filing: 1982-02-25
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Granted: 1983-02-15
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Expires: 2002-02-25
Abstract
Abstract Electrophotographic developer compositions containing carrier, toner and special purpose additives such as flow promoters, dry lubricants and the like are prepared by coating carrier particles with a coating selected so that the triboelectric relationship between the surface of the carrier and the surface of the additive is substantially zero.
Inventors
- 👤 Edward F. Mayer
- 👤 Arthur S. Diamond
- 👤 Paul Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:08
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1132; G03G9/1135; G03G9/1133; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
43 words
An electrophotographic developer composition comprising coated carrier particles together with toner particles, the coating comprising a miscible mixture of a butadiene-acrylonitrile rubber containing from about 20% to 40% by weight acrylonitrile together with a polyurethane elastomer, said mixture being soluble in organic solvents.
Claim 2
Dependent Claim
43 words
An electrophotographic developer composition comprising coated carrier particles together with toner particles, the coating comprising a miscible mixture of a butadiene-acrylonitrile rubber containing from about 20% to 40% by weight acrylonitrile together with a polyurethane elastomer, said mixture being soluble in organic solvents.
Claim 3
Dependent Claim
22 words
An electrophotographic developer composition of claim 1 wherein the concentration of toner particles is from 5 to 75 g/Kg of carrier particles.
Claim 4
Dependent Claim
42 words
Coated carriers for use in electrophotographic developer compositions comprising a core member coated with a miscible mixture comprising a butadiene-acrylonitrile rubber containing from about 20% to 40% by weight acrylonitrile together with a polyurethane elastomer, said mixture being soluble in organic solvents.
Claim 5
Dependent Claim
42 words
Coated carriers for use in electrophotographic developer compositions comprising a core member coated with a miscible mixture comprising a butadiene-acrylonitrile rubber containing from about 20% to 40% by weight acrylonitrile together with a polyurethane elastomer, said mixture being soluble in organic solvents.
Claim 6
Dependent Claim
27 words
A coated carrier of claim 3 wherein the butadiene-acrylonitrile rubber contains about 41% acrylonitrile, has a specific gravity of 1.01 and an average Mooney viscosity of 60.
Claim 7
Dependent Claim
27 words
A coated carrier of claim 3 wherein the butadiene-acrylonitrile rubber contains about 33% acrylonitrile, has a specific gravity of 0.98 and an average Mooney viscosity of 80.
Claim 8
Dependent Claim
27 words
A coated carrier of claim 3 wherein the butadiene-acrylonitrile rubber contains about 21% acrylonitrile, has a specific gravity of 0.95 and an average Mooney viscosity of 80.
Claim 9
Dependent Claim
19 words
A coated carrier of claim 5 wherein the butadiene-acrylonitrile rubber is dusted with a ketone soluble polyvinyl chloride resin.
Claim 10
Dependent Claim
80 words
A coated carrier of claim 3 wherein the polyurethane elastomer is a hard, flexible, polyurethane elastomer soluble in methyl ethyl ketone, acetone and tetrahydrofuran, and has the following physical properties: Specific Gravity: 1.20 Hardness, Durometer A: 97 Durometer D: 63 Tensile Strength (psi): 6150 Modulus @ 100 Blongation (psi): 1400 Elongation (%): 300 Graves Tear (lbs/in): 260 Tear Propagation (lbs/in): 120 Solution Viscosity (20% TS Concentration in MEK, Brookfield RVK Viscometer No. 2 Spindle, 20 rpm, 25° C.), cps.: 100-200
Claim 11
Dependent Claim
80 words
A coated carrier of claim 4 wherein the polyurethane elastomer is a hard, flexible polyurethane elastomer soluble in methyl ethyl ketone, acetone and tetrahydrofuran, and has the following physical properties: Specific Gravity: 1.20 Hardness, Durometer A: 97 Durometer D: 63 Tensile Strength (psi): 6150 Modulus @ 100% Elongation (psi): 1400 Elongation (%): 300 Graves Tear (lbs/in): 260 Tear Propagation (lbs/in): 120 Solution Viscosity (20% TS Concentration in MEK, Brookfield RVK Viscometer No. 2 Spindle, 20 rpm, 25° C.), cps.: 100-200
Claim 12
Dependent Claim
80 words
A coated carrier of claim 5 wherein the polyurethane elastomer is a hard, flexible, polyurethane elastomer soluble in methyl ethyl ketone, acetone and tetrahydrofuran, and has the following physical properties: Specific Gravity: 1.20 Hardness, Durometer A: 97 Durometer D: 63 Tensile Strength (psi): 6150 Modulus @ 100% Elongation (psi): 1400 Elongation (%): 300 Graves Tear (lbs/in): 260 Tear Propagation (lbs/in): 120 Solution Viscosity (20% TS Concentration in MEK, Brookfield RVK Viscometer No. 2 Spindle, 20 rpm, 25° C.), cps.: 100-200
Claim 13
Dependent Claim
80 words
A coated carrier of claim 6 wherein the polyurethane elastomer is a hard, flexible polyurethane elastomer soluble in methyl ethyl ketone, acetone and tetrahydrofuran, and has the following physical properties: Specific Gravity: 1.20 Hardness, Durometer A: 97 Durometer D: 63 Tensile Strength (psi): 6150 Modulus @ 100% Blongation (psi): 1400 Elongation (%): 300 Graves Tear (lbs/in): 260 Tear Propagation (lbs/in): 120 Solution Viscosity (20% TS Concentration in MEK, Brookfield RVK Viscometer No. 2 Spindle, 20 rpm, 25° C.), cps.: 100-200
Claim 14
Dependent Claim
20 words
A coated carrier as in claim 10 wherein the butadiene-acrylonitrile rubber is dusted with a ketone soluble polyvinyl chloride resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |