JPS6261948B2 - - Google Patents
Info
- Publication number
- JPS6261948B2 JPS6261948B2 JP57068075A JP6807582A JPS6261948B2 JP S6261948 B2 JPS6261948 B2 JP S6261948B2 JP 57068075 A JP57068075 A JP 57068075A JP 6807582 A JP6807582 A JP 6807582A JP S6261948 B2 JPS6261948 B2 JP S6261948B2
- Authority
- JP
- Japan
- Prior art keywords
- toner
- carrier
- weight
- silicone resin
- 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
Links
- 229920002050 silicone resin Polymers 0.000 claims description 24
- 238000011161 development Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- NYGZLYXAPMMJTE-UHFFFAOYSA-M metanil yellow Chemical group [Na+].[O-]S(=O)(=O)C1=CC=CC(N=NC=2C=CC(NC=3C=CC=CC=3)=CC=2)=C1 NYGZLYXAPMMJTE-UHFFFAOYSA-M 0.000 claims description 2
- 238000000576 coating method Methods 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 11
- 239000002245 particle Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 108091008695 photoreceptors Proteins 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- DEXFNLNNUZKHNO-UHFFFAOYSA-N 6-[3-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperidin-1-yl]-3-oxopropyl]-3H-1,3-benzoxazol-2-one Chemical group C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1CCN(CC1)C(CCC1=CC2=C(NC(O2)=O)C=C1)=O DEXFNLNNUZKHNO-UHFFFAOYSA-N 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920001756 Polyvinyl chloride acetate Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 125000005843 halogen group Chemical group 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
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 150000002843 nonmetals Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920005792 styrene-acrylic resin Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B45/00—Complex metal compounds of azo dyes
- C09B45/02—Preparation from dyes containing in o-position a hydroxy group and in o'-position hydroxy, alkoxy, carboxyl, amino or keto groups
- C09B45/14—Monoazo compounds
- C09B45/16—Monoazo compounds containing chromium
-
- 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
- G03G9/09—Colouring agents for toner particles
- G03G9/0906—Organic dyes
- G03G9/091—Azo dyes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing Agents For Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は、電子写真法、静電記録法あるいは静
電印刷法等で形成した静電像を現像するに用いら
れるキヤリアとトナーとよりなる乾式現像剤の改
良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a dry developer comprising a carrier and a toner used for developing electrostatic images formed by electrophotography, electrostatic recording, electrostatic printing, or the like.
例えば、電子写真法において感光体上に形成さ
れた静電潜像は現像剤により現像された後、必要
に応じて転写シート上に転写、定着される。ここ
で用いられる現像剤としては、従来よりトナーと
キヤリアとよりなる二成分系乾式現像剤が知られ
ているが、これは、キヤリア粒子とは逆極性に摩
擦帯電されたトナー粒子が比較的粒子サイズの粗
いキヤリア粒子表面に保持されたものであり、現
像時、感光体表面に流下又はカスケードされると
感光体の潜像領域の静電気力がキヤリア粒子とト
ナー粒子間の結合力に打ち勝つてトナー粒子が潜
像上に付着してトナー可視像を形成するものであ
る。そして、現像剤は現像によつて消費されたト
ナーを補充しながら長時間の複写に反復使用され
る。 For example, in electrophotography, an electrostatic latent image formed on a photoreceptor is developed with a developer, and then transferred and fixed onto a transfer sheet as required. As the developer used here, a two-component dry developer consisting of toner and carrier is conventionally known, but this is because toner particles that are triboelectrically charged to the opposite polarity to the carrier particles are relatively small. It is held on the surface of coarse carrier particles, and during development, when it flows down or cascades onto the surface of the photoreceptor, the electrostatic force in the latent image area of the photoreceptor overcomes the bonding force between the carrier particles and toner particles, and the toner becomes toner. Particles adhere to the latent image to form a visible toner image. The developer is repeatedly used for long-term copying while replenishing toner consumed by development.
従つて、キヤリアは長時間の使用中、常にトナ
ーを所望とする極性で、かつ十分な帯電量に摩擦
帯電しなければならない。しかしながら従来の現
像剤は、粒子間の衝突又は粒子と現像機械との衝
突の機械的衝撃又はこれらによる発熱でキヤリア
表面にトナー膜が形成、所謂スペント化が生じ、
キヤリアの帯電特性が使用時間と共に低下し、現
像剤全体を取換える必要が生ずる。 Therefore, during long-term use, the carrier must always frictionally charge the toner to a desired polarity and a sufficient amount of charge. However, with conventional developers, a toner film is formed on the carrier surface due to the mechanical impact caused by the collision between particles or the collision between particles and the developing machine, or the heat generated by these, resulting in so-called spent state.
The charging properties of the carrier deteriorate over time, necessitating replacement of the entire developer.
このようなスペント化を防止するため、従来よ
りキヤリア表面に種々の樹脂を被覆することが提
案され、中でも、低表面エネルギ物質であるシリ
コーン樹脂を被覆し、キヤリアの絶縁性を高め、
くり返し使用によるトナーの融着を防ぐことが知
られている。しかし、被覆層の剥離、摩耗などが
生じ末だ十分なものがない。 In order to prevent this type of spent, it has been proposed to coat the carrier surface with various resins. Among them, silicone resin, which is a low surface energy material, is coated to increase the carrier's insulation properties.
It is known to prevent toner from fusing due to repeated use. However, there are not enough of them, as the coating layer tends to peel off and wear out.
そこで本出願人はさきにシリコーン樹脂を被覆
したキヤリアを用いた長寿命、高安定性の現像剤
を開発したが、さらに検討を続けた結果、さらに
高性能の現像剤が得られる本発明に到達した。 Therefore, the present applicant had previously developed a long-life, highly stable developer using a carrier coated with silicone resin, but as a result of further investigation, the present invention was achieved, which allows for a developer with even higher performance. did.
すなわち本発明は、トナーとキヤリアとを主成
分とする乾式現像剤において、キヤリア表面が、
未硬化分が30重量％以下のシリコーン樹脂にて被
覆されていることを特徴とするものである。 That is, the present invention provides a dry developer mainly composed of toner and carrier, in which the surface of the carrier is
It is characterized by being coated with a silicone resin whose uncured content is 30% by weight or less.
本発明で用いられるシリコーン樹脂としては、
例えば下記〔〕又は〔〕で示される繰返し単
位を有するものがある。 The silicone resin used in the present invention includes:
For example, some have repeating units shown in [ ] or [ ] below.
Ｘ，Ｙ，Ｚ：水素原子、ハロゲン原子、ヒドロキ
シ基、メトキシ基、
C1〜４の低級アルキル基又はフエ
ニル基を表わす。 X, Y, Z: hydrogen atom, halogen atom, hydroxy group, methoxy group, C1-4 lower alkyl group or phenyl group.
上記のシリコーン樹脂自体は、四三酸化鉄など
の未被覆キヤリアと帯電系列は同レベルであるに
も係らず、公知のトナーと混合して現像剤とした
場合には、前述のようにその帯電能力は安定せ
ず、地汚れの発生やトナー飛散等の問題がある
が、それは常温で硬化させても通常未硬化成分は
50重量％以上あることによるものであることを本
発明者らはつきとめた。 Although the above-mentioned silicone resin itself has the same level of charge series as uncoated carriers such as triiron tetroxide, when it is mixed with known toners and used as a developer, the charge level increases as described above. The performance is not stable, and there are problems such as background smearing and toner scattering, but this is because uncured components are usually
The present inventors have found that this is due to the presence of 50% by weight or more.
そこで、常温硬化型のシリコーン樹脂であつて
も強制的に200〜300℃程度で焼成して未硬化成分
30重量％以下としたものが、塗膜の強度が増し、
塗膜削れが抑制され、トナースペント化も防止で
き、かつトナーに対する帯電付与性も安定してい
ることが判明した。すなわち、第１図は上記シリ
コーン樹脂の未硬化分の量とトナーの帯電量
（Ｑ／Ｍ）との関係を示し、第２図は同じく未硬
化分と塗膜削れ量との関係を示すグラフである
が、総合すると、未硬化分が30重量％を越えると
トナーの帯電量が低下し、又、塗膜の強度が弱い
ため、塗膜の削れ量が急激に多くなり使用に耐え
ない。 Therefore, even if the silicone resin is a room-temperature curing type, the uncured components are forcibly baked at around 200 to 300°C.
If the content is less than 30% by weight, the strength of the coating will increase,
It was found that coating film abrasion was suppressed, toner spent was also prevented, and the ability to impart charge to the toner was stable. That is, FIG. 1 shows the relationship between the amount of the uncured silicone resin and the charge amount (Q/M) of the toner, and FIG. 2 is a graph showing the relationship between the uncured amount and the amount of paint film scraped. However, overall, if the uncured content exceeds 30% by weight, the amount of charge of the toner decreases, and the strength of the coating film is weak, resulting in a sharp increase in the amount of abrasion of the coating film, making it unusable.
キヤリア塗膜中の未硬化成分は溶媒の使用によ
り容易に溶出してくるから、その溶出量を定量す
れば、その量が測定できる。そしてその重量百分
率の算出はキヤリア塗膜上の全シリコーン樹脂量
を真比重法で算出して、それとの百分率として行
う。 Since the uncured components in the carrier coating film are easily eluted by using a solvent, the amount can be measured by quantifying the amount of the eluted components. The weight percentage is calculated by calculating the total amount of silicone resin on the carrier coating film by the true specific gravity method and calculating the weight percentage.
本発明において、前記シリコーン樹脂を被覆す
るキヤリア芯材としては、平均粒径が20〜1000
μ、より好ましくは50〜500μの砂、コバルト、
鉄、銅、ニツケル、亜鉛、アルミニウム、黄銅、
ガラス等の非金属や金属等従来使用されている材
料が広く用いられる。シリコーン樹脂の被覆法と
しては、該樹脂を溶剤に溶解して、芯材表面に塗
布すればよい。 In the present invention, the carrier core material covering the silicone resin has an average particle size of 20 to 1000.
μ, more preferably 50-500μ sand, cobalt,
iron, copper, nickel, zinc, aluminum, brass,
Conventionally used materials such as non-metals such as glass and metals are widely used. As a coating method with silicone resin, the resin may be dissolved in a solvent and applied to the surface of the core material.
トナーとしては、染料あるいは顔料と樹脂との
混合物が用いられ、樹脂としては、ポリスチレ
ン、ポリメチルメタクリレート、ポリ−ｎ−ブチ
ルメタクリレート、ポリ塩化ビニル、ポリ酢酸ビ
ニル等の単独ビニル重合体やそれらの共重合体お
よびエポキシ樹脂、不飽和ポリエステル樹脂、フ
エノール樹脂、キシレン樹脂、ポリアミド樹脂等
公知のものが用いられる。公知の帯電制御剤が任
意にトナー中に含有されるが、下記構造例で例示
される如き含金属モノアゾ染料を用いることによ
りトナーを負に安定的に帯電させることができる
ので有利である。
A mixture of a dye or a pigment and a resin is used as the toner, and examples of the resin include homovinyl polymers such as polystyrene, polymethyl methacrylate, poly-n-butyl methacrylate, polyvinyl chloride, and polyvinyl acetate, and their co-polymers. Known polymers and epoxy resins, unsaturated polyester resins, phenol resins, xylene resins, polyamide resins and the like can be used. Although a known charge control agent may optionally be contained in the toner, it is advantageous to use a metal-containing monoazo dye as exemplified in the structural example below because the toner can be stably charged negatively.
つぎに本発明の実施例について説明する。 Next, embodiments of the present invention will be described.
実施例 １
シリコーン樹脂（商品名KR 250，信越化学(株)
製）を100μの酸化鉄粉に流動床コーテイング装
置を用いてコーテイングした。このコーテイング
した材料を電気炉に入れ250℃で２時間焼成して
キヤリアとした。このときのシリコーン樹脂の未
硬化分は18重量％であつた。Example 1 Silicone resin (product name KR 250, Shin-Etsu Chemical Co., Ltd.)
Co., Ltd.) was coated on 100μ iron oxide powder using a fluidized bed coating device. This coated material was placed in an electric furnace and fired at 250°C for 2 hours to form a carrier. The uncured content of the silicone resin at this time was 18% by weight.
一方スチレン樹脂85重量部、染料（前記構造例
１）１重量部、カーボンブラツク14重量部を混合
してトナーをつくつた。 Separately, a toner was prepared by mixing 85 parts by weight of styrene resin, 1 part by weight of dye (Structure Example 1), and 14 parts by weight of carbon black.
このトナーと前記キヤリアとを混合して現像剤
とし、複写機（商品名FT6600、(株)リコー製）に
セツトし、10万枚コピー終了後の現像剤中のキヤ
リアを走査型の電子顕微鏡で観察したが、コート
膜に損傷は見られず、トナーのスペント化も見ら
れなかつた。又キヤリア抵抗は初期の1015Ωcmに
対し1015Ωcmと変化がなかつた。 This toner and the carrier are mixed to form a developer, which is set in a copying machine (product name FT6600, manufactured by Ricoh Co., Ltd.), and after copying 100,000 copies, the carrier in the developer is examined using a scanning electron microscope. Upon observation, no damage was observed to the coat film, and no spent toner was observed. Also, the carrier resistance remained unchanged at 10 15 Ωcm compared to the initial 10 15 Ωcm.
実施例 ２
70μの酸化鉄粉５重量部にシリコーン樹脂（商
品名SR2406、トーレシリコーン社製）１重量部
をコートし、250℃で２時間焼成してキヤリアと
した。このときのシリコーン樹脂の未硬化分は18
重量％であつた。Example 2 5 parts by weight of 70 μm iron oxide powder was coated with 1 part by weight of silicone resin (trade name SR2406, manufactured by Toray Silicone Co., Ltd.) and baked at 250° C. for 2 hours to obtain a carrier. The uncured portion of silicone resin at this time is 18
It was in weight%.
一方、スチレン・アクリル樹脂（商品名SBM
700、三洋化成社製）90重量部、染料（前記構造
例６）１重量部、カーボンブラツク９重量部を混
合してトナーをつくつた。 On the other hand, styrene acrylic resin (product name SBM)
700 (manufactured by Sanyo Chemical Co., Ltd.), 1 part by weight of dye (Structure Example 6), and 9 parts by weight of carbon black to prepare a toner.
このトナーと前記キヤリアとを混合して現像剤
をつくつた。帯電量は−20μｃ／ｇであつた。こ
の現像剤を用いて実施例１と同様の複写テストを
行なつたところ、実施例１と同様の結果がられ
た。 A developer was prepared by mixing this toner and the carrier. The amount of charge was -20 μc/g. When the same copying test as in Example 1 was conducted using this developer, the same results as in Example 1 were obtained.
実施例 ３
100μのフエライトパウダ５重量部にシリコー
ン樹脂（商品名SR2411、トーレシリコーン社
製）１重量部をコートし、280℃で２時間焼成し
てキヤリアとした。このときのシリコーン樹脂の
未硬化分は12重量％であつた。Example 3 5 parts by weight of 100μ ferrite powder was coated with 1 part by weight of silicone resin (trade name SR2411, manufactured by Toray Silicone Co., Ltd.) and baked at 280° C. for 2 hours to obtain a carrier. The uncured content of the silicone resin at this time was 12% by weight.
一方、スチレン樹脂（商品名Ｄ 125、ハーキ
ユレイ社製）85重量部、染料（前記構造例８）２
重量部、カーボンブラツク13重量部を混合してト
ナーをつくつた。 On the other hand, 85 parts by weight of styrene resin (trade name D 125, manufactured by Herculay Co., Ltd.), 2 parts by weight of dye (above structure example 8)
A toner was prepared by mixing 13 parts by weight of carbon black and 13 parts by weight of carbon black.
このトナーを前記キヤリアに対しトナー濃度が
３重量％になるように混合し現像剤をつくつたと
ころ、その帯電量は−25μｃ／ｇであつた。この
現像剤を複写機（商品名FT6600、(株)リコー製）
にセツトし、15万枚コピーしたところで現像剤の
帯電量を測定したところ、−21μｃ／ｇで、ほと
んど低下がみられなかつた。さらにキヤリア表面
を走査型電子顕微鏡で観察したところ、塗膜の削
れは見られず、キヤリア抵抗は初期の1015Ωcmに
対し1014Ωcmとほとんど変化していなかつた。 When a developer was prepared by mixing this toner with the carrier so that the toner concentration was 3% by weight, the amount of charge was -25 μc/g. Apply this developer to a copying machine (product name FT6600, manufactured by Ricoh Co., Ltd.)
When the developer was set to 150,000 copies and the charge amount of the developer was measured, it was -21 .mu.c/g, with almost no decrease observed. Furthermore, when the carrier surface was observed with a scanning electron microscope, no abrasion of the coating film was observed, and the carrier resistance was 10 14 Ωcm compared to the initial 10 15 Ωcm, which was almost unchanged.
実施例 ４
実施例３におけるシリコーン樹脂に代えて、下
記に示す構造式のシリコーン樹脂を用いた他は実
施例３と同様に行なつた。このときのシリコーン
樹脂の未硬化分は12重量％であつた。Example 4 The same procedure as in Example 3 was conducted except that a silicone resin having the structural formula shown below was used in place of the silicone resin in Example 3. The uncured content of the silicone resin at this time was 12% by weight.
テストの結果15万枚コピー後も画像は鮮明であ
り、キヤリアを観察したところコート膜の損傷は
見られず、トナーのスペント化もほとんど見られ
なかつた。 Test results showed that even after copying 150,000 copies, the images remained clear, and when the carrier was observed, there was no damage to the coating film, and almost no toner was found to be spent.
比較例
実施例２において、キヤリアを焼成せず、常温
で24時間放置してシリコーン樹脂を硬化させた以
外はすべて同様にして試験をした。このときのシ
リコーン樹脂の未硬化分は45重量％であつた。現
像剤の帯電量は−10μｃ／ｇと低く、又10万枚を
コピーする間にキヤリア抵抗が変化したためと考
えられるγ特性の変化が現われ、低濃度部の再現
が不良となつた。そして帯電量は−５μｃ／ｇ程
度に低下し、トナー飛散も多くなつた。キヤリア
表面を観察したところ、コート膜の損傷が見ら
れ、地肌の露出やトナーのスペント化も見られ
た。Comparative Example Tests were conducted in the same manner as in Example 2, except that the carrier was not fired and was left at room temperature for 24 hours to cure the silicone resin. The uncured content of the silicone resin at this time was 45% by weight. The amount of charge of the developer was as low as -10 .mu.c/g, and the .gamma. characteristics changed, probably due to a change in carrier resistance while copying 100,000 sheets, resulting in poor reproduction of low-density areas. The amount of charge decreased to about -5 μc/g, and the amount of toner scattering increased. When the carrier surface was observed, it was found that the coating film was damaged, the background was exposed, and the toner was spent.
第１図はシリコーン樹脂の未硬化分の量とトナ
ー帯電量との関係を示すグラフ、第２図はシリコ
ーン樹脂の未硬化分の量と塗膜削れ量との関係を
示すグラフである。
FIG. 1 is a graph showing the relationship between the amount of uncured silicone resin and the amount of toner charge, and FIG. 2 is a graph showing the relationship between the amount of uncured silicone resin and the amount of coating abrasion.
Claims (1)
剤において、キヤリア表面が未硬化分が30重量％
以下のシリコーン樹脂にて被覆されていることを
特徴とする静電像現像用乾式現像剤。 ２ トナーは含金属モノアゾ染料を含有している
特許請求の範囲第１項記載の静電像現像用乾式現
像剤。[Claims] 1. In a dry developer mainly composed of toner and carrier, the carrier surface has an uncured content of 30% by weight.
A dry developer for electrostatic image development characterized by being coated with the following silicone resin. 2. The dry developer for electrostatic image development according to claim 1, wherein the toner contains a metal-containing monoazo dye.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57068075A JPS58184951A (en) | 1982-04-24 | 1982-04-24 | Dry type developer for developing electrostatic image |
| US06/669,749 US4562136A (en) | 1982-03-05 | 1984-11-07 | Two-component dry-type developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57068075A JPS58184951A (en) | 1982-04-24 | 1982-04-24 | Dry type developer for developing electrostatic image |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58184951A JPS58184951A (en) | 1983-10-28 |
| JPS6261948B2 true JPS6261948B2 (en) | 1987-12-24 |
Family
ID=13363283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57068075A Granted JPS58184951A (en) | 1982-03-05 | 1982-04-24 | Dry type developer for developing electrostatic image |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58184951A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2332665A1 (en) | 2009-12-08 | 2011-06-15 | Ricoh Company, Ltd. | Method for treating electrophotographic carrier, method for producing electrophotographic carrier, core material and carrier |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2560085B2 (en) * | 1988-07-22 | 1996-12-04 | 花王株式会社 | Developer for electrostatic image development |
| JPH0876416A (en) * | 1994-08-31 | 1996-03-22 | Mita Ind Co Ltd | Binary system developer |
| JP3336838B2 (en) * | 1995-08-22 | 2002-10-21 | 富士ゼロックス株式会社 | Electrostatic image developing toner, electrostatic image developer, and image forming method |
| JP3497396B2 (en) * | 1998-12-24 | 2004-02-16 | 京セラミタ株式会社 | Electrostatic latent image developing carrier and electrostatic latent image developer |
| JP3788726B2 (en) * | 2000-07-07 | 2006-06-21 | 富士ゼロックス株式会社 | Two-component developer and image forming apparatus using the same |
-
1982
- 1982-04-24 JP JP57068075A patent/JPS58184951A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2332665A1 (en) | 2009-12-08 | 2011-06-15 | Ricoh Company, Ltd. | Method for treating electrophotographic carrier, method for producing electrophotographic carrier, core material and carrier |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58184951A (en) | 1983-10-28 |
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