EP0109860B1 - Entwickler vom Zweikomponententyp für Magnetbürstenentwicklung - Google Patents
Entwickler vom Zweikomponententyp für Magnetbürstenentwicklung Download PDFInfo
- Publication number
- EP0109860B1 EP0109860B1 EP83307143A EP83307143A EP0109860B1 EP 0109860 B1 EP0109860 B1 EP 0109860B1 EP 83307143 A EP83307143 A EP 83307143A EP 83307143 A EP83307143 A EP 83307143A EP 0109860 B1 EP0109860 B1 EP 0109860B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- particles
- iron oxide
- carrier
- ferrite
- developer
- 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
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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
-
- 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
- G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
- G03G9/1075—Structural characteristics of the carrier particles, e.g. shape or crystallographic structure
-
- 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
- G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
- G03G9/108—Ferrite carrier, e.g. magnetite
- G03G9/1085—Ferrite carrier, e.g. magnetite with non-ferrous metal oxide, e.g. MgO-Fe2O3
Definitions
- the present invention relates to a two-component type developer for the magnetic brush development. More particularly, the present invention relates to a two-component type developer which can develop an electrostatic latent image under broad developing conditions according to the magnetic brush developing method, which can give an excellent printing resistance to a photosensitive plate and which can provide an image having a high quality. Especially, the present invention relates to a two-component type developer comprising a mixed carrier having a novel composition.
- a two-component composition formed by mixing an electroscopic toner with a magnetic carrier is supplied on a developing sleeve having a magnet in the interior thereof to form a magnetic brush of this composition, and an electro-photographic photosensitive plate is brought into sliding contact with this magnetic brush to form an electroscopic toner image on the photosensitive plate.
- the electroscopic toner is charged with the polarity reverse to the polarity of the electrostatic latent image on the photosensitive plate; by friction with the magnetic carrier, and the electroscopic toner particles on the magnetic brush are caused to adhere to the electrostatic latent image by the Coulomb force, whereby the development of the electrostatic latent image is accomplished.
- the magnetic carrier is attracted by the magnet in the sleeve, and since the charge polarity of the magnetic carrier is the same as that of the electrostatic latent image, the magnetic carrier is left on the sleeve.
- an iron powder carrier is broadly used as the magnetic carrier.
- this iron powder carrier has various defects. More specifically, in case of a two-component type developer comprising an iron powder carrier, the rising of the developing sensitivity curve (the curve showing the relation of the image density to the difference of the voltage between the electrostatic latent image and the developing sleeve) is very sharp, and the gradation property is inferior and the half tone-reproducing property is poor.
- this developer comprising an iron powder carrier sometimes forms a hard magnetic brush and there is a risk of damaging a photosensitive layer.
- brush marks that is, many thin and short white lines extending in the sliding direction of the brush, are formed.
- the iron powder carrier is very sensitive to the moisture, and the developing characteristics are changed by influences of the moisture or rusting is readily caused in the iron powder carrier. Still in addition, a large torque is necessary for driving the magnetic brush.
- ferrite especially soft ferrite
- the magnetic carrier of a two-component type developer has been proposed. Since a ferrite carrier has a higher electric resistance than the iron powder carrier, at the developing step, carrier drawing, that is, a trouble of bleeding of the carrier to the photosensitive layer, is readily caused and a so-called edge effect is often produced in the formed image. Moreover, no satisfactory image can be obtained unless the space between the developing sleeve and the photosensitive layer is narrowed. Furthermore, in case of the developer comprising a ferrite carrier, cleaning with the magnetic brush is difficult.
- FR-A-2346747 discloses a ferromagnetic toner comprising:
- the resin is such that heat treatment, including treatment with steam, renders the resin adhesive.
- the ferromagnetic component may consist of hard and/or soft magnetic particles.
- the magnetically soft particles can be iron or another high-permeability, low-remanence material such as iron carbonyl, certain ferrites, such as (Zn,Mn)Fe 2 0 4 or permalloys.
- the magnetically hard particles can be iron oxide, other ferrites such as BaFe 12 0 19 , chi-iron carbide, chromium dioxide or mixtures of Fe 3 0 4 and nickel or cobalt.
- the toners can be employed to print, by magnetic printing processes, a variety of substrates such as textiles, film, paper, metal and wood.
- the toners are one-component toners.
- Another object of the present invention is to provide a'two-component type developer which can develop an electrostatic latent image according to the magnetic brush development method under broad developing conditions, which can give a higher printing resistance to a photosensitive layer than the conventional developers and which can provide an image having a high density and being excellent in the gradation property without such troubles as formation of brush marks and carrier drawing.
- a two-component type developer suitable for the magnetic brush development of an electrostatic latent image comprising a mixture of magnetic carrier particles and toner particles chargeable by friction with the magnetic carrier particles, wherein the developer comprises particles of an iron powder as a first type of magnetic carrier particles and particles of a ferrite as a second type of magnetic carrier particles at a weight ratio of iron powder: ferrite of from 60:40 to 5:95.
- the present invention is based on the novel finding that when an iron powder carrier and a ferrite carrier are used in combination as the magnetic carrier of a two-component type developer at a weight ratio of from 60/40 to 5/95, especially from 30/70 to 10/90, severe developing conditions become unnecessary and an electrostatic latent image can be developed stably under broad developing conditions, the printing resistance of a photosensitive layer can be improved as compared with the case where the conventional two-component type developer for the magnetic brush development is used, and a high quality image free of such defects as brush marks and carrier drawing can be obtained.
- the combination of the two types of carrier particles is sometimes referred to herein as the "mixed carrier".
- a magnet roll 1 comprising magnetic poles N and S is contained in a sleeve 2 formed of a non-magnetic material such as aluminum, and at least one of the magnet roll 1 and sleeve 2 is driven and rotated.
- a two-component type developer 3 is supplied on the peripheral surface of the sleeve 2 from a developer tank 4 to form a magnetic brush 5.
- the earing length of the magnetic brush 5 is adjusted by an ear-cutting mechanism 6, and the magnetic brush 5 is delivered to the sliding contact position on an electrophotographic photosensitive layer 7 on a drum substrate.
- An electrostatic latent image on the photosensitive layer 7 is developed by an electroscopic toner 8 to form a visible image.
- FIG. 2 is an enlarged diagram illustrating the earing state of the magnetic brush 5, in the mixed carrier of the present invention
- an iron powder carrier 9 is predominantly distributed in the portion close to the outer surface of the sleeve, while a ferrite carrier 10 is predominantly distributed in the portion close to the outer side of the magnetic brush 5. More specifically, if this mixed carrier is supplied onto the developing sleeve, the iron powder carrier 9 having a large coercive force is first attracted strongly to the surface of the sleeve, but the ferrite carrier 10 having a small coercive force is placed on the iron powder carrier 9, and in this state, the magnetic brush 5 is formed. Because of the characteristics of the preparation process, iron powder carrier particles 9 have ordinarily an indeterminate shape, while the ferrite carrier 10 has a substantially spherical particle shape formed by sintering.
- the magnetic brush having the above-mentioned micro-structure since the magnetic brush having the above-mentioned micro-structure is formed, various advantages are attained.
- the magnetic carrier which forms a hard magnetic brush tends to damage the surface of the photosensitive layer and to form brush marks.
- a soft tip of the ferrite carrier is formed on the top end portion of the ear of the iron powder carrier, and therefore, the tendency to damage the surface of the photosensitive layer and form brush marks in the toner image is drastically reduced.
- the earing length of the magnetic brush is adjusted to such a short length as 0.5 to 2 mm.
- the ferrite carrier is retained in the top end portion of the iron powder carrier having a large coercive force, even if the earing length of the magnetic brush is adjusted to a long length customarily adopted for the iron carrier, that is, 2 to 5 mm, an excellent developed image is formed without falling of the carrier, and therefore, disadvantages caused when the clearance between the sleeve and the photosensitive layer is drastically reduced, such as wearing of the photosensitive layer and the difficulty in designing the apparatus, can be eliminated. Furthermore, since the ferrite carrier is strongly retained in the top end portion of the iron powder carrier, troubles caused by use of the ferrite carrier such as toner drawing can be prevented from occurrence.
- the mixed carrier of the present invention even if the earing length of the magnetic brush is adjusted to such a short length as adopted in case of the ferrite carrier, a good image can be formed. Accordingly, an advantage that the range of applicable developing conditions is very broad can be attained according to the present invention.
- the electric resistance of the magnetic carrier is high, an image excellent in the gradation property is obtained.
- the mixed carrier of the present invention since the ferrite carrier having a high electric resistance is present in the state where the ferrite carrier is connected in series to the iron powder carrier having a low electric resistance, even if the mixing ratio of the iron powder carrier in the mixed carrier is considerably increased, the electric resistance of the magnetic brush as a whole is maintained at a high level, and an image excellent in the gradation property can be obtained.
- the iron powder carrier and ferrite carrier should be used at the above-mentioned weight ratio. If the amount of the ferrite carrier or iron powder carrier is too small and below the above-mentioned range, attainment of the above-mentioned advantages of the present invention becomes difficult.
- Sintered ferrite particles especially spherical sintered ferrite particles, are advantageously used as the ferrite carrier, and it is ordinarily preferred that the particle size of the sintered ferrite particles be 20 to 100 pm.
- the particle size of the sintered ferrite particles is smaller than 20 11 m, good earing of the magnetic brush can hardly be obtained, and if the particle size of the sintered ferrite particles is larger than 100 pm, the above-mentioned brush marks, that is, scratches, are readily formed in the formed toner image.
- the sintered ferrite particles used in the present invention are known sintered ferrite particles.
- sintered ferrite particles composed of at least one member selected from zinc iron oxide (ZnFe 2 0 4 ), yttrium iron oxide (Y 3 Fe 5 O l2 ), cadmium iron oxide (CdFe 2 0 4 ), gadolinium iron oxide (Gd 3 Fe 5 O l2 ), copper iron oxide (CuFe 2 0 4 ), lead iron oxide (PbFe l2 O l9 ), nickel iron oxide (NiFe 2 0 4 ), neodymium iron oxide (NdFe0 3 ), barium iron oxide (BaFe l2 O l9 ), magnesium iron oxide (MgFe 2 0 4 ), manganese iron oxide (MnFe 2 0 4 ) and lanthanum iron oxide (LaFe0 3 ).
- Sintered ferrite particles composed of manganese iron oxide and zinc iron oxide are especially suitable for attain
- any of known iron powder carriers can be used as the iron powder carrier in the present invention. It is ordinarily preferred that the particle size of the iron powder carrier be 20 to 150 pm.
- An iron powder as the magnetic carrier is ordinarily prepared by subjecting soft steel scraps to the primary pulverization, oil quenching, mineral dressing and nitriding to form brittle primary particles, pulverizing the primary particles to form final particles, and subjecting the particles to the denitriding treatment and then to the surface-oxidizing treatment to increase the electric resistance of the surface.
- the so-prepared iron powder has an indeterminate shape.
- an iron powder carrier having a spherical or ellipsoidal shape can also be used.
- the two-component type developer of the present invention can be prepared by mixing the above-mentioned mixed magnetic carrier with a known electroscopic coloring toner.
- the developer can be formed by blending the magnetic carrier with the toner at a weight ratio of from 100/6 to 100/17, especially from 100/8 to 100/15.
- Any of coloring toners having an electroscopic property and a fixing property can be used in the present invention.
- a thermoplastic resin or an uncured or pre-condensed thermosetting resin may be used as the binder resin.
- a vinyl aromatic resin an acrylic resin, a polyvinyl acetal resin, a polyester resin, an epoxy resin, a phenolic resin, a petroleum resin and an olefin resin.
- the pigment there can be used at least one member selected from carbon black, cadmium yellow, molybdenum orange, Pyrazolone Red, Fast Violet B and Phthalocyanine Blue.
- the charge controlling agent there may be used oil-soluble dyes such as Nigrosine Base (Cl 50415), Oil-Black (CI26150) and Spiron Black, and metal salts of naphthenic acid, metal soaps of fatty acids and soaps of resin acids according to need.
- ferrite carrier (a), iron powder carrier (b) and toner (c) were mixed at various ratios shown in Table 1 and blended and stirred to form developers.
- the copying operation was carried out by using these developers in a copying machine (Mita PC-191 supplied by Mita Industrial Company Limited). Clear images excellent in the gradation property and free of brush mark, fogging and edge effect could be obtained in each case.
- a mixture comprising the above toners ingredients were melt-kneaded and dispersed by a hot three-roll mill, and the kneaded mixture was cooled and roughly pulverized to a size of about 2 mm by a rough pulverizer (Rotoplex Cutting Mill supplied by Alpine Co.), and was finely pulverized to a size of about 10 to about 20 ⁇ m by an ultrasonic jet mill (supplied by Nippon Pneumatic Mfg. Co., Ltd.).
- the ferrite carrier, iron powder carrier and toner used in Examples 1 through 5 were sufficiently mixed at ratios shown in Table 2, and the copying operation was carried out under the same conditions as in Examples 1 through 5 in the copying machine Mita DC-191 by using the so-prepared developers. In the obtained copies, no fogging was observed, but such defects as edge effect, carrier drawing, brush mark and poor gradation were observed as indicated by marks "X" in Table 2.
- the developing sensitivity curves of the developers obtained in Examples 1 through 5 and Comparative Examples 1 through 4 are shown in Fig. 3.
- the solid lines indicate the results obtained by using the toners of the present invention and dot lines show the results obtained by using the comparative toners. From the results shown in Fig. 3, it is seen that in the developers of the present invention, the rising is more gradual than in the developer composed solely of the iron powder carrier and toner (Comparative Example 4), and the toners of the present invention provide images excellent in the gradation property and have a good half tone-reproducing property.
- particle sizes are average particle sizes unless otherwise specified.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Developing Agents For Electrophotography (AREA)
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP203554/82 | 1982-11-22 | ||
JP57203554A JPS5994763A (ja) | 1982-11-22 | 1982-11-22 | 磁気ブラシ現像用二成分系現像剤 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0109860A1 EP0109860A1 (de) | 1984-05-30 |
EP0109860B1 true EP0109860B1 (de) | 1987-10-07 |
Family
ID=16476055
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83307143A Expired EP0109860B1 (de) | 1982-11-22 | 1983-11-22 | Entwickler vom Zweikomponententyp für Magnetbürstenentwicklung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0109860B1 (de) |
JP (1) | JPS5994763A (de) |
DE (1) | DE3374032D1 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59182464A (ja) * | 1983-04-01 | 1984-10-17 | Hitachi Ltd | 電子写真法 |
JPS60258559A (ja) * | 1984-06-06 | 1985-12-20 | Ricoh Co Ltd | 静電潜像現像剤 |
JPS6180263A (ja) * | 1984-09-28 | 1986-04-23 | Mita Ind Co Ltd | 電子写真用二成分系現像剤およびそれを用いた現像方法 |
JPS6199158A (ja) * | 1984-10-22 | 1986-05-17 | Mita Ind Co Ltd | 電子写真用二成分系現像剤およびそれを用いた現像方法 |
DE3542834A1 (de) * | 1985-12-04 | 1987-06-11 | Basf Ag | Farbige einkomponententoner und verfahren zu ihrer herstellung |
US4764445A (en) * | 1987-06-15 | 1988-08-16 | Eastman Kodak Company | Electrographic magnetic carrier particles |
US4855206A (en) * | 1988-08-05 | 1989-08-08 | Eastman Kodak Company | Rare earth containing magnetic carrier particles |
US4855205A (en) * | 1988-08-05 | 1989-08-08 | Eastman Kodak Company | Interdispersed two-phase ferrite composite and carrier therefrom |
US4990876A (en) * | 1989-09-15 | 1991-02-05 | Eastman Kodak Company | Magnetic brush, inner core therefor, and method for making such core |
JP3187582B2 (ja) * | 1992-06-15 | 2001-07-11 | 京セラ株式会社 | 静電潜像用現像剤および画像形成方法 |
JP3812955B2 (ja) * | 1993-08-24 | 2006-08-23 | 株式会社Neomax | 現像剤用キャリアおよびそれを使用した画像形成方法 |
US6548218B1 (en) | 1994-06-22 | 2003-04-15 | Canon Kabushiki Kaisha | Magnetic particles for charging means, and electrophotographic apparatus, process cartridge and image forming method including same |
EP1434104A3 (de) * | 2002-12-27 | 2004-11-17 | Ricoh Company, Ltd. | Magnetischer Träger, Zweikomponentenentwickler, Entwicklungsverfahren, Entwicklungsgerät und elektrophotographischer Apparat zur Bildherstellung |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51124434A (en) * | 1975-04-22 | 1976-10-29 | Ricoh Co Ltd | Duplicating method for plural sheets |
US4105572A (en) * | 1976-03-31 | 1978-08-08 | E. I. Du Pont De Nemours And Company | Ferromagnetic toner containing water-soluble or water-solubilizable resin(s) |
JPS5913732B2 (ja) * | 1977-07-05 | 1984-03-31 | コニカ株式会社 | 鉄粉現像担体及びその製造方法並びに現像剤と画像形成方法 |
JPS5595954A (en) * | 1979-01-11 | 1980-07-21 | Mita Ind Co Ltd | Composite magnetic developer |
US4287287A (en) * | 1980-01-28 | 1981-09-01 | Xerox Corporation | Electrostatographic carrier coated with thixotropic compositions |
NL8006065A (nl) * | 1980-04-24 | 1981-11-16 | Indiana General Corp | Electrofotografische samengestelde drager met zelfreinigende werking tijdens gebruik in een copieermachine. |
JPS5737355A (en) * | 1980-08-15 | 1982-03-01 | Fuji Xerox Co Ltd | Developing method |
-
1982
- 1982-11-22 JP JP57203554A patent/JPS5994763A/ja active Pending
-
1983
- 1983-11-22 EP EP83307143A patent/EP0109860B1/de not_active Expired
- 1983-11-22 DE DE8383307143T patent/DE3374032D1/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0109860A1 (de) | 1984-05-30 |
DE3374032D1 (en) | 1987-11-12 |
JPS5994763A (ja) | 1984-05-31 |
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