US3857792A - An electrostatic developer mixture with a coated carrier - Google Patents
An electrostatic developer mixture with a coated carrier Download PDFInfo
- Publication number
- US3857792A US3857792A US00242780A US24278072A US3857792A US 3857792 A US3857792 A US 3857792A US 00242780 A US00242780 A US 00242780A US 24278072 A US24278072 A US 24278072A US 3857792 A US3857792 A US 3857792A
- Authority
- US
- United States
- Prior art keywords
- weight
- carrier
- polyphenylene oxide
- carrier particles
- resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 70
- 229920005989 resin Polymers 0.000 claims abstract description 91
- 239000011347 resin Substances 0.000 claims abstract description 91
- 239000002245 particle Substances 0.000 claims abstract description 70
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 50
- 229920006380 polyphenylene oxide Polymers 0.000 claims abstract description 50
- 239000007787 solid Substances 0.000 claims abstract description 13
- -1 siloxanes Chemical class 0.000 claims description 28
- 229920001897 terpolymer Polymers 0.000 claims description 26
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 22
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical class [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 20
- 150000002894 organic compounds Chemical class 0.000 claims description 17
- 229910052710 silicon Inorganic materials 0.000 claims description 17
- 125000000962 organic group Chemical group 0.000 claims description 13
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- 150000001875 compounds Chemical class 0.000 claims description 9
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- 125000004432 carbon atom Chemical group C* 0.000 claims description 8
- 150000004819 silanols Chemical class 0.000 claims description 7
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
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- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 3
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- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 2
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- 230000002411 adverse Effects 0.000 description 2
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- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- BRDYCNFHFWUBCZ-UHFFFAOYSA-N dodecaneperoxoic acid Chemical compound CCCCCCCCCCCC(=O)OO BRDYCNFHFWUBCZ-UHFFFAOYSA-N 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- GFJVXXWOPWLRNU-UHFFFAOYSA-N ethenyl formate Chemical compound C=COC=O GFJVXXWOPWLRNU-UHFFFAOYSA-N 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 description 1
- 239000004867 fossil resin Substances 0.000 description 1
- ANAGEECPKFGKEL-UHFFFAOYSA-N furan-2-carbaldehyde;phenol Chemical compound OC1=CC=CC=C1.O=CC1=CC=CO1 ANAGEECPKFGKEL-UHFFFAOYSA-N 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229920000591 gum Polymers 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 150000002391 heterocyclic compounds Chemical class 0.000 description 1
- PYGSKMBEVAICCR-UHFFFAOYSA-N hexa-1,5-diene Chemical group C=CCCC=C PYGSKMBEVAICCR-UHFFFAOYSA-N 0.000 description 1
- 125000004836 hexamethylene group Chemical class [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 229920002681 hypalon Polymers 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229940063557 methacrylate Drugs 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- DCUFMVPCXCSVNP-UHFFFAOYSA-N methacrylic anhydride Chemical compound CC(=C)C(=O)OC(=O)C(C)=C DCUFMVPCXCSVNP-UHFFFAOYSA-N 0.000 description 1
- POULHZVOKOAJMA-UHFFFAOYSA-N methyl undecanoic acid Natural products CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002828 nitro derivatives Chemical class 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical class OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 125000004817 pentamethylene group Chemical class [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229930015698 phenylpropene Natural products 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920003227 poly(N-vinyl carbazole) Polymers 0.000 description 1
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 230000037048 polymerization activity Effects 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229920001289 polyvinyl ether Polymers 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 229920006215 polyvinyl ketone Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 description 1
- LJCNRYVRMXRIQR-OLXYHTOASA-L potassium sodium L-tartrate Chemical compound [Na+].[K+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O LJCNRYVRMXRIQR-OLXYHTOASA-L 0.000 description 1
- PEFYPPIJKJOXDY-UHFFFAOYSA-J potassium;tetrachloroalumanuide Chemical compound [Al+3].[Cl-].[Cl-].[Cl-].[Cl-].[K+] PEFYPPIJKJOXDY-UHFFFAOYSA-J 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- OLBCVFGFOZPWHH-UHFFFAOYSA-N propofol Chemical compound CC(C)C1=CC=CC(C(C)C)=C1O OLBCVFGFOZPWHH-UHFFFAOYSA-N 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 150000004053 quinones Chemical class 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000012262 resinous product Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 235000011006 sodium potassium tartrate Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- JFLKFZNIIQFQBS-FNCQTZNRSA-N trans,trans-1,4-Diphenyl-1,3-butadiene Chemical group C=1C=CC=CC=1\C=C\C=C\C1=CC=CC=C1 JFLKFZNIIQFQBS-FNCQTZNRSA-N 0.000 description 1
- GQIUQDDJKHLHTB-UHFFFAOYSA-N trichloro(ethenyl)silane Chemical compound Cl[Si](Cl)(Cl)C=C GQIUQDDJKHLHTB-UHFFFAOYSA-N 0.000 description 1
- 239000005050 vinyl trichlorosilane Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 239000005019 zein Substances 0.000 description 1
- 229940093612 zein Drugs 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/113—Developers with toner particles characterised by carrier particles having coatings applied thereto
- G03G9/1132—Macromolecular components of coatings
- G03G9/1135—Macromolecular components of coatings obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- G03G9/1136—Macromolecular components of coatings obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon atoms
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/113—Developers with toner particles characterised by carrier particles having coatings applied thereto
- G03G9/1132—Macromolecular components of coatings
- G03G9/1133—Macromolecular components of coatings obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/113—Developers with toner particles characterised by carrier particles having coatings applied thereto
- G03G9/1132—Macromolecular components of coatings
- G03G9/1135—Macromolecular components of coatings obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
Definitions
- This invention relates in general to imaging systems and, more particularly to improved developing materials, their manufacture and use.
- the cascade technique is carried out in automatic machines.
- small buckets on an endless belt conveyor scoop the developer material from a sump and convey it to a point above an electrostatic image-bearing surface where the developer mixture is allowed to fall and cascade or roll by gravity across the image-bearing surface.
- the carrier beads along with any unused toner particles are then returned to the sump for recycling through the developing system.
- Small quantities of toner are periodically added to the developer mixture to compensate for the toner depleted during the development process. This process is repeated for each copy produced in the machine and is ordinarily repeated many thousands of times during the usable life of the developer.
- Examples of typical unsaturated organo silanes having hydrolyzable groups attached to a silicon atom include: vinyl triethosy silane, vinyl trimethoxy silane, vinyl-tris, (beta-methoxyethoxy), silane, gammamethacryloxypropyltrimethoxy silane, vinyl trichlorosilane, vinyl triacetoxy silane, divinyl dichloro silane, and dimethyl vinyl chloro silane.
- Suitable corresponding polymerizable hydrolysis products and the corresponding siloxanes may be substituted for the foregoing unsaturated organo silanes.
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
Development is obtained in an electrostatographic imaging system with a developer mixture wherein the carrier particles are coated with a thin layer of a solid polyphenylene oxide resin or a blend of a polyphenylene oxide resin and a thermoplastic or thermosetting resin.
Description
United States Patent [191 Madrid et a1. [4 Dec. 31 1974 AN ELECTROSTATIC DEVELOPER [56] References Cited MIXTURE WITH A COATED CARRIER UNITED STATES PATENTS [76] Inventors: Robert W. Madrid, 160 Jacobs Rd., 2,857,290 10/1958 Bolton 252/62.1 Macedon, N,Y, 14502; Robert J, 2,874,063 2/1959 Greig.... 252/62.l Hagenbach, 235 Westmoreland Dr., g;
, 8"] ran Rochester 4620 3,383,435 5/1962 Cizek 260/287 [22] Filed: Apr. 10, 1972 3,526,533 9/1970 Jacknow et al. 252/62.l
[21] Appl 242780 Primary Examiner-Ronald H. Smith Related US. Application Data Assistant Examiner-J. P. Brammer [60] Division of Ser. No. 27,1 14, April 9, 1970, which is a continuation-in-part of Ser. No. 585,793, Oct. 11, [57] ABSTRACT 1966 abandoned Development is obtained in an electrostatographic imaging system with a developer mixture wherein the [52] 252,611; carrier particles are coated with a thin layer of a solid Int Cl g 9/02 polyphenylene oxide resin or a blend of a polyphenylo o n u e s e s s e s e I a s u. 1 I e a I a [58] Field of Search 252/60.l, 117/100, 17.5, resin 3 Claims, 'No Drawings AN ELECTROSTATIC DEVELOPER MIXTURE WITH A COATED CARRIER This is a division of application Ser. No. 27,1 14, filed Apr. 9, 1970 which is a continuation-in-part of application Ser. No. 585,793, filed Oct. 11, 1966, now abandoned.
This invention relates in general to imaging systems and, more particularly to improved developing materials, their manufacture and use.
The formation and development of images on the surface of photoconductive materials by electrostatic means is well known. The basic xerographic process, as taught by C. F. Carlson in U.S. Pat. No. 2,297,691, involves placing a uniform electrostatic charge on a photoconductive insulating layer, exposing the layer to a light and shadow image to dissipate the charge on the areas of the layer exposed to the light and developing the resulting latent electrostatic image by depositing on the image a finely divided electroscopic material referred to in the art as toner. The toner will normally be attracted to those areas of the layer which retain a charge, thereby forming a toner image corresponding to the latent electrostatic image. This powder image may then be transferred to a support surface such as paper. The transferred image may subsequently be permanently affixed to the support surface as by heat. Instead of latent image formation by uniformly charging the photoconductive layer and then exposing the layer to a light and shadow image, one may form the latent image by directly charging the layer in image configuration. The powder image may be fixed to the photoconductive layer if elimination of the powder image transfer step is desired. Other suitable means such as solvent or overcoating treatment may be substituted for the foregoing heat fixing step.
Several methods are known for applying the electroscopic particles to the latent electrostatic image to be developed. One development method, as disclosed by L. E. Walkup is U.S. Pat. No. 2,618,551 and E. N. Wise in U.S. Pat. No. 2,618,552, is known as cascade development. In this method, a developer material comprising relatively large carrier particles having fine toner particles electrostatically coated thereon is conveyed to and rolled or cascaded across the electrostatic image-bearing surface. The composition of the carrier particles is so chosen as to triboelectrically charge the toner particles to the desired polarity. As the mixture cascades or rolls across the image-bearing surface, the toner particles are electrostatically deposited and secured to the charged portion of a latent image and are not deposited on the uncharged or background portion of the image. Most of the toner particles accidentally deposited in the background areas are removed by the rolling carrier, due apparently, to the greater electrostatic attraction between the toner and carrier than between the toner and the discharge background. The carrier and excess toner are then recycled. This technique is extremely good for the development of line copy images.
Another technique for developing electrostatic im-, ages is the magnetic brush process as disclosed, for example, in U.S. Pat. No. 2,874,063. In this method, a developer material containing toner and magnetic carrier particles is carried by magnets. The magnetic field of the magnet causes alignment of the magnetic carrier in a brush-like configuration. This magnetic brush is engaged with an electrostatic image-bearing surface and the toner particles are drawn from the brush to the electrostatic image by electrostatic attraction.
In most commercial processes, the cascade technique is carried out in automatic machines. In these machines, small buckets on an endless belt conveyor scoop the developer material from a sump and convey it to a point above an electrostatic image-bearing surface where the developer mixture is allowed to fall and cascade or roll by gravity across the image-bearing surface. The carrier beads along with any unused toner particles are then returned to the sump for recycling through the developing system. Small quantities of toner are periodically added to the developer mixture to compensate for the toner depleted during the development process. This process is repeated for each copy produced in the machine and is ordinarily repeated many thousands of times during the usable life of the developer. It is apparent that in this process, as well as in other development techniques the developer mixture is subjected to a great deal of mechanical attrition which tends to degrade both the toner and carrier particles. This degradation, of course, occurs primarily as a result of shear and impact forces due to the tumbling of the developer mixture on the xerographic plate and the movement of the bucket conveyor through the developer material in the sump. Deterioration or degradation of carrier particles is characterized by the separation of portions of or the entire carrier coating from the carrier core. The separation may be in the form of chips, flakes or entire layers and is primarily caused by fragile, poorly adhereing coating materials which fail upon impact and abrasive contact with machine parts and other carrier particles. Carriers having coatings which tend to chip and otherwise separate from the carrier core must be frequently replaced thereby increasing expense and consuming time. Print deletion and poor print quality occur when carrier particles having damaged coatings are not replaced. Fines and grit formed from carrier coating disintegration tend to drift and form unwanted deposits on critical machine parts. Many materials having high compressive and tensile strength either do not adhere well to the carrier core or do not possess the desired triboelectric characteristics. The triboelectric and flow characteristics of many carriers are adversely effected when relative humidity is high. For example, the triboelectric values of some carrier coatings fluctuate with changes in relative humidity and are not desirable for employment in xerographic systems, particularly in automatic machines which require carriers having stable predictable triboelectric values. Another factor affecting the stability of carrier triboelectric properties is the susceptibility of carrier coatings to toner impaction." When the carrier particles are employed in automatic machines and recycled through many cycles, the many collisions which occur between the carrier particles and other surfaces in the machine cause the toner particles carried on the surface of the carrier particles to be welded or otherwise forced into carrier coatings. The gradual accumulation of permanently attached toner material to the surface of the carrier particles causes a change in the triboelectric value of the carrier particles and directly contributes to the degradation of copy quality by eventual destruction of the toner carrying capacity of the carrier. Further, many carrier coating materials are difficult to apply to carrier cores because they tend to form thin filaments rather than smooth continuous coatings.
Since developer materials must flow freely to facilitate accurate metering and even distribution during the development and developer recycling phases of the electrostatographic process, the presence of filaments and carrier having rough outer surfaces in developer materials is unsuitable because the developer materials tend to cake, bridge, and agglomerate. Some carrier coating materials having acceptable triboelectric and coating properties are unacceptable for employment on a commercial scale because they cannot be economically mass produced. For example,quality control of the triboelectric value of some resin blends is difficult to maintain because a slight deviation in component percentages causes the triboelectric value of the resulting product to change drastically. Carrier coating materials having close tolerance triboelectric values are particularly important in high speed automatic copying machines. Thus, there is a continuing need for a better system for developing latent electrostatic images.
It is, therefore, an object of this invention to provide developing materials which overcome the above noted deficiencies.
It is another object of this invention to provide carrier coating materials which tenaciously adhere to carrier cores. I
It is a still further object of this invention to provide carrier coatings having stable triboelectric values.
It is yet another object of this invention to provide carrier coatings having high tensile and compressive strength.
It is a further object of this invention to provide coated carriers having smooth outer surfaces.
It is still another object of this invention to provide toner impaction resistant carrier coatings.
It is a further object of this invention to provide car rier coating materials having easily adjustable triboelectric values;
It is yet another object of this invention to provide carrier coatings which are more resistant to chipping and flaking.
It is another object of this invention to provide developers having physical and chemical properties superior to those of known developer materials.
The above objects and others are accomplished, generally speaking, by providing novel electrostatographic developer materials including carrier cores coated with a composition comprising a polyphenylene oxide resin. The resin component employed in the carrier coatings of this invention may comprise a polyphenylene oxide resin per se. or a polyphenylene oxide resin blended with one or more other resins. The polyphenylene oxide resin coating may be employed in any suitable thickness. Typically the coating on the free flowing carrier particles is at least about 1 micron in thickness. However, a coating having a thickness of at least about 2.5 microns is preferred because the carrier coating will then possess sufficient thickness to resist abrasion and prevent any pinholes which would adversely affect the triboelectric properties of the coated carrier particles. The maximum coating thickness is generally determined by the amount of coating material capable of being coated on the core by any given coating technique which produces free flowing coated particles and which does not result in agglomeration. A practical maximum coating thickness for large size cores is therefore about 20 microns. Within these limits, a coating thickness of from about 3 to about 5 microns proachieved with coatings which are neither uniform or continuous.
Any suitable linear polyphenylene oxide resin may be employed. These polyphenylene oxide resins have the general formula:
wherein: R and R are each selected from the group consisting of H and alkyl radicals having a total of up to 12 carbon atoms in R and R and n is a positive integer of at least about 25. Generally, the high molecular weight film-forming polyphenylene oxide resins employed in the carrier coatings of this invention are obtained by well known polymerization techniques such as the oxidative coupling of phenols. Oxidative'coupling involves the reaction of oxygen with active hydro gens from different molecules to produce water and a dimer linked by an oxygen. In order to form polymers by the oxidative coupling technique, a polyphenylene oxide monomer must. have at least two active hydrogens. Optimum impaction resistance is obtained with a polyphenylene oxide resin formed by the copper catalyzed oxidation of 2,6-dimethylphenol. The resulting polymer has methyl groups at R and R" in the general formula set forth above. While a 2,6-xylenol monomer is preferred, any other suitable phenol may be used to produce useful resin carrier coatings. Typical phenols include: phenol; Z-methylphenol; 2-propyl phenol; 2- isobutyl phenol; 2,6diethyl phenol; 2,6-diisopropyl phenol; 2-ethyl-6'methyl phenol; 2,5-dimethyl phenol; 3,5-dimethyl phenol; and the like.
Any suitable resin may be blended with a polyphenylene oxide resin to form the carrier coating materials of this invention. These resins may include natural resins, modified natural resins or synthetic resins prepared by addition, condensation or any other technique proving suitable. The polyphenylene oxide resin may be blended with other resins in any suitable amount. Generally to maintain the properties of the polyphenylene oxide resin as a coating it is present in the blend in at least the major proportion. Typical natural and modified natural resins include: gum copal, gum sandarac, rosin, fossil resins, zein, ethyl cellulose, cellulose acetate, cellulose nitrate, gum nitrate, oxidized rosin, pentaerythritol esters of rosin and the like. Typical synthetic resins include polymers, copolymers, terpolymers and other polymeric structures and modified polymeric structures including, for example, polyolefins such as polyethylene, polypropylene, chlorinated I polyethylene, and chlorosulfonated polyethylene; polyvinyl and polyvinylidine compounds such as polystyrene, polymethylstyrene, polymethyl methacrylate, polyacrylic acid, polyacrylonitrile, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyvinyl chloride, polyvinyl carbazole, polyvinyl ethers and polyvinyl ketones; fluorocarbons such as polytetrafluoroethylene,
polyvinylfluoride, polyvinylidenefluoride and polychlorotrifluoroethylene; polyamides such as polycaproloctamo and polyhexamethylene adipamide; polyesters such as polyethylene terephthalate; polyurethanes; polysulfides; polycarbonates; epoxies such as the condensation reaction product of epichlorohydrin with any one of a bisphenol A, resorcinol, hydroquinone and ethylene glycol; phenolic resins such as phenol formaldehyde, phenol furfural and resorcinol formaldehyde; amino aldehydes such as urea formaldehyde and melamine formaldehyde; and mixtures thereof.
Excellent results are obtained with a carrier coating containing a polyphenylene oxide resin blended with the products of an addition polymerization reaction be tween monomers or prepolymers of: 1 organo silanes, silanols or siloxanes having from one to three hydrolyzable groups and an organic group attached directly to the silicon atom containing less than eight carbon atoms and an unsaturated carbon to carbon linkage capable of addition polymerization and (2) one or more silicon free types of unsaturated polymerizable organic compounds. These addition reaction products have a weight average molecular weight of at least about 5,000. Outstanding results are obtained with a carrier coating containing a solid polymeric reaction product of monomers of prepolymers of: (l) styrene and homologues thereof, (2) acrylate or methacrylate esters and (3) organo silanes, silanols or siloxanes having from one to three hydrolyzable groups and an organic group attached directly to a silicon atom containing less than eight carbon atoms and an unsaturated carbon to car bon linkage capable of addition polymerization. These organosilicon terpolymers are preferred additives because the resulting blend possesses especially good tri boelectric stability and synergistic resistance to toner impaction.
Typically a solid copolymer addition reaction product may be obtained from about 99.5 to about 50 percent, by weight, of an unsaturated silicon free organic compound and from about 0.5 to about 50 percent, by weight, of the above described polymerizable organosilicon composition. Typically the solid terpolymer comprises from about 5 to about 94.5 percent, by weight, of an unsaturated silicon free organic compound, from about 94.5 to about 5 percent, by weight, of an unsaturated silicon free organic compound different from the first mentioned silicon free compound and from about 0.5 to about 50 percent, by weight, of one of the above described polymerizable organosilicon compounds.
The unsaturated organic group attached to the sili con atom contains the unsaturation in a non-benzoid group and is preferably an unsaturated hydrocarbon group. Typical unsaturated organic groups include: vinyl, chlorvinyl, divinyl, distyryl, allyl, diallyl, triallyl, allyl phenyl, dimethyl ally] and methacryloxypropyl groups. Typical hydrolyzable groups include:: ethoxy, methoxy, chloro, bromo, propoxy, acetoxy and amino groups. Examples of typical unsaturated organo silanes having hydrolyzable groups attached to a silicon atom include: vinyl triethosy silane, vinyl trimethoxy silane, vinyl-tris, (beta-methoxyethoxy), silane, gammamethacryloxypropyltrimethoxy silane, vinyl trichlorosilane, vinyl triacetoxy silane, divinyl dichloro silane, and dimethyl vinyl chloro silane. Suitable corresponding polymerizable hydrolysis products and the corresponding siloxanes may be substituted for the foregoing unsaturated organo silanes. Unsaturated organic groups having less than six carbon atoms attached to the silicon atom are preferred because of the unusually greater polymerization activities of these groups, If more than one organic group is attached to the silicon atom, only one of the organic groups need be unsaturated to enter into a polymerization reaction with other v unsaturated monomers. Hence, compounds such as dimethyl vinyl chloro silanes are suitable. When more than one unsaturated organic group attached to the sili con atom are present, these'unsaturated groups need not be identical. For example, vinyl allyl silicon chlorides and bromides may be employed. Partially condensed siloxanes in the liquid state having reactive unsaturated organic groups attached to a silicon atom may be employed as a terpolymer reactant.
Suitable silicon free monomers or prepolymers with which the above organosilicon compounds are particularly adapted to react to form the polymeric organosilicon resin additives of this invention include the unsaturated compounds which normally form resinous polymers by addition type polymerization. Monomers or prepolymers containing the unsaturation in a nonbenzoid group may be employed, such unsaturated monomers or prepolymers include those having ethylenic or acetylenic linkage. Thus, there are included olefms, diolefins, acetylenes and their derivatives, particularly derivatives having substituents such as halogen, alkyl, aryl, unsaturated alicyclic and other types of substituent groups including, for example, nitrile or nitro groups. The unsaturated organic monomers containing the unsaturation in a non-benzoid group also include unsaturated hydrocarbons, aliphatic carbocyclic, and heterocyclic compounds including unsaturated alcohols, aldehydes, ketones, quinones, acids, acid anhydrides, esters, nitriles or nitro compounds. Typical unsaturated monomers include: ethylene, propylene, butenes, isobutylene, pentenes, hexenes, methyl metha crylate, methyl acrylate, vinyl chloride, vinylidene chloride, acrylonitrile, chlorovinyl acetate, styrene, butadene, chloroprene, cyclopentadene, divinyl benzene, cyclohexadiene, ethyl methacrylate, vinyl acetate, vinyl toluene, acetylene, phenylacetylene, ethylvinyl benzene, allyl chloride, allyl benzene, maleic anhydride, ethyl acrylate, diethylmaleate, butyl acrylate, butyl methacrylate, isobutyl methacrylate, methacrylic anhydride, vinyl formate, and mixtures thereof.
Polymerization of the unsaturated organosilicon and unsaturated silicon free unsaturated compounds are effected with any suitable free-radical initiator or catalyst capable of polymerizing the monomers or prepolymers. By a free-radical initiator or catalyst is meant a compound which is capable of producing free-radicals under the polymerization conditions employed, such as compounds having an -OO or an N=N linkage. Examples of the more commonly employed freeradical initiators or catalysts include: alkyl peroxides, such as tert-butyl hydroperoxide, and di-tert-butyl peroxide, acyl and aroyl peroxides, such as dibenzoyl peroxide, perbenzoic acid, dilauroy peroxide, perlauric acid and acetyl benzoyl peroxide; azo compounds such as azo-bisisobutyronitrile, dimethaylazodiisobutyrate, azo-bis-l-phenylethane and alkali metal azodisulfonates; and the like.
Generally, the impaction resistance of most resin blends increases with an increase in the quantity of polyphenylene oxide resin present in the blend. The
polyphenylene oxide resin is therefore generally at least present in the major amount in resin blends. However, an exception to this general rule has been found with combinations of polyphenylene oxide resins with the organosilicon terpolymers described above. As illustrated in the Examples below, optimum synergistic results are obtained when the polyphenylene oxide resinorganosilicon terpolymer resin ratio is from about 90:10 to about 25:75. The extremely high resistance to toner impaction is completely unexpected because the polyphenylene oxide resin organosilicon terpolymer resin blend possesses higher toner impaction resistance than either the polyphenylene oxide resin or the or ganosilicon terpolymer resin alone. No satisfactory explanation for this surprising result has been found.
When the carrier coatings of this invention contain thermosetting resins blended with a polyphenylene oxide resin, the blending should be effected while the thermosetting resin is in a monomeric or partially polymerized stage. Polymerization of the thermosetting monomer or partially polymerized prepolymer may be completed in situ after the blend is applied to a carrier core. In situ polymerization may be effectuated by any well known technique as by application of heat. If a thermosetting resin prepolymer is employed, the prepolymer should be in a liquid or thermoplastic stage so that uniform blending of the prepolymer as a melt or in a solvent solution will be facilitated.
To achieve further variation in the properties of the final resinous product, well known additives such as plasticizers, reactive resins, dyes, pigments, wetting agents, and mixtures thereof may be mixed with the resin coating of this invention. When an organosilicon polymer is blended with the polyphenylene oxide resin, hydrolysis of the hydrolyzable groups attached to the silicon atoms may be promoted by pre-treating the carrier core with any suitable hydrolyzing medium such as a dilute solution of acetic acid or by mixing the hydrolyzing material with the organosilicon polymer prior to the coating operation.
Any'suitable well known coated or uncoated carrier material may be employed as the core of the carriers of this invention. Typical carrier materials include sodium chloride, ammonium chloride, aluminum potassium chloride, Rochelle salt, sodium nitrate, potassium chlorate, granular zircon, granular silicon, methyl methacrylate, glass, silicon dioxide, flintshot, iron, steel, ferrite, nickel, carborundum and mixtures thereof. Many of the foregoing and other typical carriers are described by L. E. Walkup in U.S. Pat. No. 2,618,551; L. E. Walkup et al in U.S. Pat. No. 2,638,416 and E. N. Wise in U.S. Pat. No. 2,618,552. An ultimate coated carrier particle diameter between about 40 microns to about 600 microns is preferred because the carrier particles then possess sufficient density and inertia to avoid adherence to the electrostatic latent images during the cascade development process. Adherence of the carrier beads of an electrostatographic drum is undesirable because of the formation of deep scratches on the drum surface during the image transfer and drum cleaning steps, particularly when cleaning is accomplished by a web cleaner such as the web disclosed by W. P. Graff, Jr., et al in U.S. Pat. No. 3,186,838.
The surprisingly better results obtained from the employment of polymeric carrier coating materials containing polyphenylene oxide resins and blends thereof may be due to many factors. For example, it is postulated that the unusually low water absorption properties of the polyphenylene oxide resins contribute to the stable triboelectric properties thereof. Further, although it is not entirely clear, the high resistance of the carrier coatings to toner impaction may be at least partly due to the high tensile strength and heat resistance exhibited by polyphenylene oxide resins, particularly blends of polyphenylene oxide resins with organosilicon terpolymers. The polyphenylene oxide coatings of this invention adhere well to the carrier cores tested and are also highly resistant to chipping, and flaking.
The polyphenylene oxide resin coating compositions may be applied to a carrier core by any conventional method such as spraying, dipping, fluidized bed coating, brushing, and the like. The polyphenylene oxide resins or blends thereof may be applied as a powder, dispersion, solution, emulsion, or hot melt. When applied as a solution, any suitable solvent may be em ployed. Solvents having relatively low boiling points are preferred because less energy and time is required to remove the solvent subsequent to application of the coating to the carrier core. Typical solvents include the halogenated aliphatics such as chloroform and l,2- dichloro ethane; aromatic hydrocarbons such as toluene and o-chlorobenzene; and the like. Any suitable coating thickness may be employed. However, the carrier coating should be sufficiently thick to resist flaking and chipping. The quantity of resin to be applied to the carrier cores depends upon the density and the surface area presented by the carrier cores. Typical coating weights include from about 20 to about 1,000 grams of coating material per pounds of flintshot carrier cores haivng an average diameter of about 600 mi crons.
Any suitable pigmented dyed electroscopic toner material may be employed with the coated carrier of this invention. Typical toner materials include: cumaroneindene resin, asphaltum, phenolformaldehyde resins, rosin-modified phenolformaldehyde resins, methacrylic resins, polystyrene resins, polypropylene resins, epoxy resins, polyethylene resins and the like. Typical toner materials are disclosed by H. E. Copley in U.S. Pat. 2,659,670; R. B. Landrigan in U.S. Pat. No. 2,753,308; M. A. lnsalaco in U.S. Pat. No. 3,079,342 and C. F. Carlson in U.S. Pat. No. Re. 25,136.
The following examples further define, describe and compare methods of preparing the carrier materials of the present invention and of utilizing them to develop electrostatic latent images. Parts and percentages are by weight unless otherwise indicated.
EXAMPLE I A control sample containing 1 part colored toner particles having an average particle size of about 10 to about 12 microns and. about 99 parts coated carrier particles available in the Xerox 813 Developer sold by the Xerox Corporation, Rochester, New York is cascaded across an electrostatic imagebearing surface. The resulting developed image is transferred by electrostatic means to a sheet of paper whereon it is fused by heat. The residual powder is removed from the electrostatic imaging surface by a cleaning web of the type disclosed by W. P. Graff, Jr., et al in U.S. Pat. No. 3,186,838. After the copying process is repeated 8,000 times, the developer mix is examined for the presence of carrier coating chips and flakes. Numerous carrier chips and flakes are found in the developer mix.
EXAMPLE II A coating solution containing about 20 grams, by weight, of polyphenylene oxide resin, PPO Grade C- 1001 resin sold by the General Electric Company, Pittsfield, Massachusetts, dissolved in about 100 parts chloroform and 175 parts dichloro benzene is sprayed onto glass beads having an average diameter of about 600 microns. About 20 grams of polyphenylene oxide resin is applied to about pounds of glass carrier cores. After drying, the developing procedure of Example I is repeated with the foregoing coated carriers substituted for the Xerox 813 carrier particles. An examination of the developer mix after test termination reveals substantially no carrier coating chips or flakes,
EXAMPLE III A coating solution about 20 grams, by weight, of a resin blend comprising about 85 percent polyphenylene oxide resin and about percent of an organosilicon terpolymer resin consisting essentially of the addition polymerization reaction product between about 15 parts sytrene, about 85 parts methyl methacrylate and about 5 parts of vinyl triethoxy silane dissolved in toluene is sprayed onto glass beads having an average diameter of about 600 microns. About 10 grams of resin blend is applied to about 5 pounds of glass carrier cores. After drying, the developing procedure of Example I is repeated with the foregoing coated carrier sub-- stituted for the Xerox 813 carrier particles, an examination of the developer mix after test termination reveals substantially no carrier coating chips or flakes.
EXAMPLE IV A control sample containing one part pigmented resin toner particles having an average particle size of about 10 to about 12 microns and about 99 parts coated carrier particles available in the Xerox 813 De veloper sold by the Xerox Corporation, Rochester, New York, is tumbled in a rotating cylindrical jar having a diameter of about 2 1% inches and a surface speed of about 140 feet per minute. Most of the carrier coating separated in the form of flakes from the carrier core after about 100 hours after the test is initiated. The carrier coating remaining on the carrier core is almost completely impacted with toner.
EXAMPLE V rier particles substituted for the Xerox 813 carrier particles. No chips or flakes are found. A slight amount of toner impaction is first observed after a milling time of about 144 hours.
EXAMPLE VI The milling procedure described in Example V is continued until the cumulative milling time is about 240 hours. Upon termination of the milling, no chips or flakes are found. Examination of the carrier surfaces reveals complete impaction.
EXAMPLE vn Glass carrier cores having an average diameter of about 600 microns are spray coated with a coating solution comprising about 10 percent, by weight, of a resin blend comprising about 85 percent polyphenylene oxide resin, PPO PR53I 1 resin sold by the General Electric Co., and about 15 percent of an organosilicon terpolymer resin consisting essentially of the addition polymerization reaction product between about 15 parts styrene, about 85 parts methyl methacrylate and about 5 parts vinyl triethoxy silane. About 20 grams of the resin blend is applied to about 5 pounds of glass cores. After drying, the milling procedure of Example IV is repeated with the foregoing coated carrier particles substituted for the Xerox 813 carrier particles. A slight amount of toner impaction is first observed after a milling time of about 144 hours. No chips or flakes are found.
EXAMPLE VIII The milling procedure described in Example VII is continued until the cumulative milling time is about 240 hours. Upon termination of the milling, no chips or flakes are found. Examination of the carrier surfaces reveals almost complete toner impaction.
EXAMPLE IX Glass carrier cores having an average diameter of about 600 microns are spray coated with a coating solution comprising about 10 percent, by weight, of a resin blend comprising about percent polyphenyl ene oxide resin and about 25 percent of an organosilicon terpolymer resin consisting essentially of the addition polymerization reaction product between about 50 parts styrene, about parts methyl methacrylate and about 5 parts vinyl triethoxy silane. About 20 grams of the resin blend is applied to about 5 pounds of glass cores. After drying, the milling procedure of Example IV is repeated with the foregoing coated carrier particles substituted for the Xerox 813 carrier particles. A slight amount of toner impaction is first observed after a milling time of about 192 hours. No chips or flakes are found.
EXAMPLE X The milling procedure described in Example IX is continued until the cumulative milling time is about 240 hours. Upon termination of the milling, no chips or flakes are found. Examination of the carrier surfaces reveals only slight toner impaction.
EXAMPLE XI Glass carrier cores having an average diameter of about 600 microns are spray coated with a coating solution comprising 10 percent, by weight, ofa resin blend comprising about 50 percent polyphenylene oxide resin and about 50 percent of an organosilicon terpolymer resin consisting essentially of the addition polymerization reaction product between about l5 parts styrene, about 85 parts methyl metacrylate and about 5 parts vinyl triethoxy silane. About 20 grams of the resin blend is applied to about 5 pounds of glass cores. After drying, the milling procedure of Example IV is repeated with the foregoing coated carrier particles substituted for the Xerox 813 carrier particles. A slight amount of toner impaction is first observed after a milling time of about 96 hours. No chips or flakes are found.
EXAMPLE XII The milling procedure described in Example XI is continued until the cumulative milling time is about 192 hours. Upon termination of the milling, no chips or flakes are found. Examination of the carrier surfaces reveals almost complete toner impaction.
EXAMPLE XIII Glass carrier cores having an average diameter of about 600 microns are spray coated with a coating solution comprising about 10 percent, by weight, of an organosilicon terpolymer resin consisting essentially of the addition polymerization reaction product between about 15 parts styrene, about 85 parts methyl methacrylate and about parts vinyl triethoxy silane. About 20 grams of the resin is applied to about 5 pounds of glass cores. After drying, the milling procedure of Example IV is repeated with the foregoing coated carrier particles substituted for the Xerox 813 carrier particles. A slight amount of toner impaction is first observed after a milling time of about 96 hours. No chips or flakes are found.
EXAM PLE XIV The milling procedure described in Example XIII is continued until the cumulative milling time is about 192 hours. Upon termination of the milling, no chips or flakes are found. Examination of the carrier surfaces reveals complete toner impaction.
EXAMPLE XV Steel carrier cores having an average diameter of about 250 microns are spray coated with a coating solution comprising about 15 percent, by weight, of a resin blend comprising about 90 percent polyphenylene oxide resin NORYL resin sold by the General Electric Company, and about percent of an organosilicon terpolymer resin consisting essentially of the addition polymerization reaction product between about 50 parts styrene, about 50 parts isobutyl methacrylate and about 5 parts gammamethacryloxypropyltrimethoxy silane. About 20 grams of the resin blend is applied to about pounds of steel cores. After drying, the milling procedure of Example IV is repeated with the foregoing coated carrier particles substituted for the Xerox 813 carrier particles. A slight amount of toner 'impaction is first observed after a milling time of about 144 hours. No chips or flakes are found.
EXAMPLE XVI Flintshot carrier cores having anaverage diameter of about 600 microns are spray coated with a coating solution comprising about percent, by weight,.of a resin blend comprising about 90 percentpolyphenylene oxide resin and about 10 percent of polycarbonate resin. About 35 grams of the resin blend is applied to about 5 pounds of flintshot cores. After drying, the milling procedure of Example IV is repeated with the foregoing carrier particles substituted for the Xerox 813 carrier particles. A slight amount of toner impaction is first observed after a milling time of about 240 hours. No chips or flakes are found.
EXAMPLE XVII Iron carrier cores having an average diameter of about 500 microns are spray coated with a coating solution comprising about 10 percent, by weight, of a resin blend comprising about percent polyphenylene oxide resin and about 25 percent of ethylenevinylacetate copolymer resin. About 20 grams of the resin blend is applied to about 10 pounds of iron cores. After drying, the milling procedure of Example IV is repeated with the foregoing coated carrier particles substituted for the Xerox 813 carrier particles. A slight amount of toner impaction is first observed after a milling time of about 144 hours. No chips or flakes are found.
Although specific materials and conditions were set forth in the above exemplary processes in making and using the developer materials of this invention, these are merely intended as illustrations of thepresent invention. Various other toners, carrier cores, substitu ents and processes such as those listed above may be substituted for those in the examples with similar results.
Other modifications of the present invention will occur to those skilled in the art upon a reading of the present disclosure. These are intended to be included within the scope of this invention.
What is claimed is:
1. An electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising particulate cores surrounded by a thin outer layer, said thin outer layer comprising from about I to about 20 microns in thickness of a blend of a polyphenylene oxide resin and a solid terpolymer of (1) from about 5 to about 94.5%, by weight of an unsaturated silicon free organic compound, (2) from about 94.5 to about 5% by weight of an unsaturated silicon free organic compound different from the compound of l) and (3) from about 0.5 to about 50%, by weight of a polymerizable organosilicon compound selected from the group consisting of silanes, silanols and siloxanes having from one to three hydrolyzable groups and an organic group attached directly to a silicon atom containing less than 8 carbon atoms and an unsaturated carbon to carbon linkage, the weight ratio of said polyphenylene oxide to said terpolymer being from about :10 to about 25:75.
2. -An electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising particulate cores surrounded by a thin outer layer, said thin outer layer comprising from about 1 to about 20 microns in thickness of a blend of a polyphenylene oxide resin and a solid terpolymer of (I) from about 5 to about 94.5%, by weight, of a styrene composition, (2) from about 94.5 to about 5%, by weight, of a composition selected from the group consisting of acrylate and methacrylate esters and (3) from about 0.5 to about 50%, by weight, of a polymerizable organosilicon composition selected from the group consisting of organosilanes, silanols and siloxanes having from one to three hydrolyzable groups and an organic group attached directly to a silicon atom containing less than eight carbon atoms and an unsaturated carbon to carbon linkage, the weight ratio of said poly- 13 phenylene oxide to said terpolymer being from about 90:10 to about 25:75
3. An electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising particulate cores surrounded by a thin outer layer, said thin outer layer comprising from about 1 to about 20 microns in thickness of a blend of a solid polyphenylene oxide resin and a solid linear addition terpolymer of 1) from about to about 94.5%, by weight, of a styrene composition, (2) from about 94.5 to about 5%, by weight, of a methacrylate composition selected from the group consisting of methyl,
40 to about 600 microns.
UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent N 3,857,792 Dated December 31 1974 In Robert W. Madrid and Robert J. Hagenbach It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Cover page, first column, after [76] Inventors: Robert W. Madrid, 160 Jacobs Rd. Macedon; Robert J. Hagenbach, 235 Westmoreland Dr. Rochester, both of N.Y. insert Assignee: Xerox Corporation, Rochester, N.Y.-
Signed and sealed this 13th day of March 1975.
(SEAL) Attest:
C. MARSHALL DANN Commissioner of Patents RUTH C. B'iASON and Trademarks Attesting Officer FORM PC4050 uscoMM-oc scan-Pea U-S. GOVIRNHINT PRINTING OFFICE "I, 0-8ll-33l,
Claims (3)
1. AN ELECTROSTOGRAPHIC DEVELOPER MIXTURE COMPRISING FINELY DIVIDED TONER PARTICLES ELECTOSTATICALLY CLINGING TO THE SURFACE OF CARRIER PARTICLES, SAID CARRIER PARTICLES COMPRISING PARTICULATE CORES SURROUNDED BY A THIN OUTER LAYER, SAID THIN OUTER LAYER COMPRISING FROM ABOUT 1 TO ABOUT 20 MICRONS IN THICKNESS OF A BLEND OF POLYPHENYLENE OXIDE RESIN AND A SOLID TERPOLYMER OF (1) FROM ABOUT 5 TO ABOUT 94.5% BY WEIGHT OF AN UNSATURATED SILICON FREE ORGANIC COMPOUND (2) FROM ABOUT 94.5 TO ABOUT 5% BY WEIGHT OF AN UNSATURATED SILICON FREE ORGANIC COMPOUND DIFFERENT FROM THE COMPOUND OF (1) AND (3) FROM ABOUT 0.5 TO ABOUT 50% BY WEIGHT OF A POLYMERIZABLE ORGANOSILICON COMPOUND SELECTED FROM THE GROUP CONSISTING OF SILANES, SILANOLS AND SILOXANES HAVING FROM ONE TO THREE HYDROLYZABLE GROUPS AND AN ORGANIC GROUP ATTACHED DIRECTLY TO A SILICON ATOM CONTAINING LESS THAN 8 CARBON ATOMS AND AN UNSATRATED CARBON TO CARBON LINKAGE, THE WEIGHT RATIO OF SAID POLYPROPYLENE OXIDE TO SAID TERPOLYMER BEING FROM ABOUT 90:10 TO ABOUT 25:75.
2. An electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising particulate cores surrounded by a thin outer layer, said thin outer layer comprising from about 1 to about 20 microns in thickness of a blend of a polyphenylene oxide resin and a solid terpolymer of (1) from about 5 to about 94.5%, by weight, of a styrene composition, (2) from about 94.5 to about 5%, by weight, of a composition selected from the group consisting of acrylate and methacrylate esters and (3) from about 0.5 to about 50%, by weight, of a polymerizable organosilicon composition selected from the group consisting of organosilanes, silanols and siloxanes having from one to three hydrolyzable groups and an organic group attached directly to a silicon atom containing less than eight carbon atoms and an unsaturated carbon to carbon linkage, the weight ratio of said polyphenylene oxide to said terpolymer being from about 90:10 to about 25:75.
3. An electrostatographic developer mixture comprising finely divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles comprising particulate cores surrounded by a thin outer layer, said thin outer layer comprising from about 1 to about 20 microns in thickness of a blend of a solid polyphenylene oxide resin and a solid linear addition terpolymer of (1) from about 5 to about 94.5%, by weight, of a styrene composition, (2) from about 94.5 to about 5%, by weight, of a methacrylate composition selected from the group consisting of methyl, ethyl, propyl and butyl methacrylate and (3) from about 0.5 to about 50%, by weight, of a polymerizable organosilicon composition selected from the group consisting of silanes, silanols and siloxanes having from one to three hydrolyzable groups and an organic group attached directly to a silicon atom containing less than six carbon atoms and an unsaturated carbon to carbon linkage, the weight ratio of said polyphenylene oxide to said terpolymer being from about 90:10 to about 25:75, said carrier particles having a diameter of from about 40 to about 600 microns.
Priority Applications (1)
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US00242780A US3857792A (en) | 1966-10-11 | 1972-04-10 | An electrostatic developer mixture with a coated carrier |
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US58573966A | 1966-10-11 | 1966-10-11 | |
US00027114A US3850676A (en) | 1966-10-11 | 1970-04-09 | Coated carrier particles for electrostatographic development |
US00242780A US3857792A (en) | 1966-10-11 | 1972-04-10 | An electrostatic developer mixture with a coated carrier |
US00244254A US3849127A (en) | 1966-10-11 | 1972-04-12 | Electrostatographic process in which coated carrier particles are used |
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US00242780A Expired - Lifetime US3857792A (en) | 1966-10-11 | 1972-04-10 | An electrostatic developer mixture with a coated carrier |
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Cited By (5)
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US4162226A (en) * | 1972-06-05 | 1979-07-24 | Chatterji Arun K | Electrostatic toner with an antiplasticizer |
US4248954A (en) * | 1977-09-07 | 1981-02-03 | Am International, Inc. | Coated carrier particles for use in electrophotographic process |
US5194357A (en) * | 1991-08-30 | 1993-03-16 | Xerox Corporation | Developer compositions with carrier particles comprising polymeric alcohol waxes |
US20060292478A1 (en) * | 2005-06-22 | 2006-12-28 | Xerox Corporation | Carrier composition |
CN105242505A (en) * | 2015-10-23 | 2016-01-13 | 湖北鼎龙化学股份有限公司 | Acrylic resin, carrier coated by resin, and double-composition developer |
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US2919247A (en) * | 1954-12-23 | 1959-12-29 | Haloid Xerox Inc | Tripartite developer for electrostatic images |
US3239465A (en) * | 1958-05-12 | 1966-03-08 | Xerox Corp | Xerographic developer |
US3383435A (en) * | 1965-01-06 | 1968-05-14 | Gen Eiectric Company | Blend of a polyphenylene ether and a styrene resin |
US3526533A (en) * | 1966-08-10 | 1970-09-01 | Xerox Corp | Coated carrier particles |
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US2874063A (en) * | 1953-03-23 | 1959-02-17 | Rca Corp | Electrostatic printing |
US2919247A (en) * | 1954-12-23 | 1959-12-29 | Haloid Xerox Inc | Tripartite developer for electrostatic images |
US2857290A (en) * | 1955-09-21 | 1958-10-21 | Ibm | Electroferrographic printing process and apparatus therefor |
US3239465A (en) * | 1958-05-12 | 1966-03-08 | Xerox Corp | Xerographic developer |
US3383435A (en) * | 1965-01-06 | 1968-05-14 | Gen Eiectric Company | Blend of a polyphenylene ether and a styrene resin |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US4162226A (en) * | 1972-06-05 | 1979-07-24 | Chatterji Arun K | Electrostatic toner with an antiplasticizer |
US4248954A (en) * | 1977-09-07 | 1981-02-03 | Am International, Inc. | Coated carrier particles for use in electrophotographic process |
US5194357A (en) * | 1991-08-30 | 1993-03-16 | Xerox Corporation | Developer compositions with carrier particles comprising polymeric alcohol waxes |
US20060292478A1 (en) * | 2005-06-22 | 2006-12-28 | Xerox Corporation | Carrier composition |
US7419755B2 (en) | 2005-06-22 | 2008-09-02 | Xerox Corporation | Carrier composition |
CN105242505A (en) * | 2015-10-23 | 2016-01-13 | 湖北鼎龙化学股份有限公司 | Acrylic resin, carrier coated by resin, and double-composition developer |
CN105242505B (en) * | 2015-10-23 | 2019-12-31 | 湖北鼎龙化学股份有限公司 | Acrylic resin, carrier coated with the same, and two-component developer |
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