JPH01108558A - Production of carrier for two-component developer - Google Patents
Production of carrier for two-component developerInfo
- Publication number
- JPH01108558A JPH01108558A JP62267122A JP26712287A JPH01108558A JP H01108558 A JPH01108558 A JP H01108558A JP 62267122 A JP62267122 A JP 62267122A JP 26712287 A JP26712287 A JP 26712287A JP H01108558 A JPH01108558 A JP H01108558A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- powder
- toner
- carrier
- magnetic powder
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000011347 resin Substances 0.000 claims abstract description 91
- 229920005989 resin Polymers 0.000 claims abstract description 91
- 239000000843 powder Substances 0.000 claims abstract description 35
- 230000009477 glass transition Effects 0.000 claims abstract description 8
- 239000006247 magnetic powder Substances 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 19
- 239000004698 Polyethylene Substances 0.000 abstract description 2
- -1 polyethylene Polymers 0.000 abstract description 2
- 229920000573 polyethylene Polymers 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 17
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 8
- 239000004926 polymethyl methacrylate Substances 0.000 description 8
- 238000007639 printing Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000969 carrier Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- MSYLJRIXVZCQHW-UHFFFAOYSA-N formaldehyde;6-phenyl-1,3,5-triazine-2,4-diamine Chemical compound O=C.NC1=NC(N)=NC(C=2C=CC=CC=2)=N1 MSYLJRIXVZCQHW-UHFFFAOYSA-N 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- GZVHEAJQGPRDLQ-UHFFFAOYSA-N 6-phenyl-1,3,5-triazine-2,4-diamine Chemical compound NC1=NC(N)=NC(C=2C=CC=CC=2)=N1 GZVHEAJQGPRDLQ-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 206010016275 Fear Diseases 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000987 azo dye Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000025 natural resin Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 229920005792 styrene-acrylic resin Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 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
- G03G9/1131—Coating methods; Structure of coatings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
電子写真等に使用される磁性キャリアに関し、キャリア
の帯電性を高めると共に表面積を拡げてトナー濃度マー
ジンを拡大することを目的とし、磁性粉の表面に該磁性
粉の粒径よりも小さい粒径をもち、ガラス転移点が２０
０℃以下の第１の樹脂よりなる粉末を静電付着させた後
、該第１の樹脂よりなる粉末を熱溶融させ、前記磁性粉
の表面に該第１の樹脂よりなる被覆層を形成した後、該
被覆層の上に圧縮破壊強度が１０Ｋｇ／ ｗ”以上をも
つ第２の樹脂よりなり、粒径が５μｍ以下の球状樹脂を
固定させる方法により二成分現像剤用キャリアを製造す
る。[Detailed Description of the Invention] [Summary] Regarding magnetic carriers used in electrophotography, etc., the purpose of increasing the chargeability of the carrier and expanding the surface area to increase the toner concentration margin is to increase the toner density margin on the surface of magnetic powder. It has a particle size smaller than that of powder and has a glass transition point of 20.
After electrostatically depositing a powder made of a first resin at 0° C. or lower, the powder made of the first resin was thermally melted to form a coating layer made of the first resin on the surface of the magnetic powder. Thereafter, a carrier for a two-component developer is manufactured by fixing a spherical resin made of a second resin having a compressive breaking strength of 10 Kg/w'' or more and having a particle size of 5 μm or less on the coating layer.
本発明は帯電性を高めると共に、トナー濃度マージンを
拡大した二成分現像剤用キャリアの製造方法に関する。The present invention relates to a method for producing a carrier for a two-component developer, which has improved chargeability and an expanded toner concentration margin.
電子写真技術は複写機に広く使用されているがプリンタ
やファクシミリなどの情報機器にも盛んに利用されてい
る。Electrophotographic technology is widely used in copying machines, but is also actively used in information devices such as printers and facsimile machines.
こ＼で電子写真式プリンタの印字プロセスとしては、光
導電性絶縁体を被覆したフォトコンドラムの表面をコロ
ナ放電などにより一様に帯電させた後、電気信号に対応
してオン、オフさせた光を光導電性絶縁体に照射して静
電潜像を作り、この潜像にトナーを付着して可視像とす
る。The printing process of an electrophotographic printer is to uniformly charge the surface of a photocondrum coated with a photoconductive insulator using corona discharge, and then turn it on and off in response to an electrical signal. Light is applied to the photoconductive insulator to create an electrostatic latent image, and toner is applied to the latent image to form a visible image.
こ＼で、トナーは合成樹脂の中に着色剤を分散させた着
色微粒子であり、キャリアと呼ばれる磁性粉と共に磁気
ロールに供給され、キャリアが磁気吸引されて磁気ブラ
シを形成しつ＼回転する段階でキャリアとトナーとが相
互に摩擦して互いに逆極性に帯電して磁性現像剤が作ら
れる。At this stage, the toner is a colored fine particle made by dispersing a colorant in a synthetic resin, and is supplied to a magnetic roll together with magnetic powder called a carrier, and the carrier is magnetically attracted to form a magnetic brush while rotating. The carrier and toner rub against each other and are charged to opposite polarities, creating a magnetic developer.
次に、静電潜像があるフォトコンドラムの表面を磁気ブ
ラシの穂が擦過することによりトナーのみを電気的な吸
引力により分離付着させて静電潜像を現像する。Next, the ear of the magnetic brush rubs the surface of the photocondrum on which the electrostatic latent image is located, so that only the toner is separated and adhered by electric attraction, and the electrostatic latent image is developed.
このようにして作られたトナー像は転写部で記録紙の裏
側から電界を与えることにより静電的に記録紙上に写し
取らせた後、定着器でトナー像に熱と圧力を加えて記録
紙に融着させることにより記録が完成している。The toner image created in this way is electrostatically transferred onto the recording paper by applying an electric field from the back side of the recording paper in the transfer section, and then heat and pressure are applied to the toner image in the fixing unit to transfer the toner image onto the recording paper. The record is completed by fusing it to the
次に、キャリアとトナーの二成分からなる磁性現像剤は
二成分現像剤と言われ、キャリアとしては平均粒径が１
００μｍ程度の鉄（Ｆｅ）粉、フェライト（γ−Ｆｅａ
ｒ３）粉、マグネタイト（ｐｅ３０４）粉などの磁性粉
末或いは、これに樹脂被覆を施した磁性粉末が使われて
いる。Next, a magnetic developer consisting of two components, carrier and toner, is called a two-component developer, and the average particle size of the carrier is 1.
Iron (Fe) powder of about 00μm, ferrite (γ-Fea)
Magnetic powder such as r3) powder, magnetite (PE304) powder, or magnetic powder coated with resin is used.
また、トナーとしては天然樹脂或いは合成樹脂からなる
結着樹脂の中に着色剤を分散して平均粒径１０μｍ程度
に微粉砕した非磁性の絶縁粉末が常用されている。Furthermore, as a toner, a non-magnetic insulating powder is commonly used, which is made by dispersing a coloring agent in a binder resin made of natural or synthetic resin and pulverizing the mixture to an average particle size of about 10 μm.
上記のようにキャリアとトナーからなる二成分現像剤を
用いて現像を行うと、転写性と定着性は優れるもの＼、
キャリアとトナーとの混合比を示すトナー濃度の許容幅
が非常に狭いために、使用、 中は消費されたトナー
を適切に補給し、常に一定のトナー濃度に保つ必要があ
る。As mentioned above, when development is performed using a two-component developer consisting of carrier and toner, transfer and fixing properties are excellent.
Because the tolerance range for toner concentration, which indicates the mixing ratio of carrier and toner, is extremely narrow, it is necessary to appropriately replenish consumed toner during use and to maintain a constant toner concentration at all times.
そのため精度の高いトナー補給機構とトナー濃度制御機
構が必要で、装置が高価になると云う問題があった。Therefore, a highly accurate toner replenishment mechanism and toner concentration control mechanism are required, which poses a problem in that the apparatus becomes expensive.
そこで、このような問題を緩和してトナー濃度許容幅を
広くする方法として粒径の小さな磁性キャリアを用いる
方法が知られている。Therefore, as a method of alleviating such problems and widening the allowable range of toner concentration, a method of using a magnetic carrier having a small particle size is known.
然し、小粒径化した磁性粉末を使用する場合は樹脂被覆
を均一な厚さに行うことが難しくなり、そのために電気
抵抗や帯電性の調節の効果が不充分になる。However, when magnetic powder having a small particle size is used, it becomes difficult to coat the resin with a uniform thickness, and as a result, the effect of controlling electrical resistance and chargeability becomes insufficient.
そこで、この問題を解決する方法として絶縁樹脂中に磁
性粉末を分散した小粒径の樹脂キャリアが開発され、こ
れにより電気抵抗と帯電性の制御が可能となった。Therefore, as a method to solve this problem, a small-particle resin carrier was developed in which magnetic powder was dispersed in an insulating resin, and this made it possible to control electrical resistance and chargeability.
然し、かかるキャリアはｖＬ男が弱くなるので磁気ブラ
シを構成するマグネットロールから離れ易いため、印刷
に当たってキャリアが用紙に付着すると云う問題があっ
た。However, since such a carrier has a weak VL force and is easily separated from the magnet roll constituting the magnetic brush, there is a problem in that the carrier adheres to the paper during printing.
Ｃ発明が解決しようとする問題点〕 以上記したように、磁力が強く、帯電性に優れ。Problems that invention C attempts to solve] As mentioned above, it has strong magnetic force and excellent charging properties.
トナー濃度許容幅が広く、電気抵抗と帯電性の制御が可
能なことなどをキャリアの必要条件として挙げることが
できる。Necessary conditions for the carrier include having a wide toner concentration tolerance range and being able to control electrical resistance and chargeability.
然し、結着樹脂の中に磁性粉末を分散した樹脂キャリア
は帯電性とトナー濃度許容幅の条件を満たしてはいるが
磁力の条件を満たしていない。However, a resin carrier in which magnetic powder is dispersed in a binder resin satisfies the conditions for chargeability and toner concentration tolerance, but does not satisfy the conditions for magnetic force.
また、Ｆｅ、 ｒ−Ｆｅ２Ｏ２，Ｐｅ５ｏｓなどの磁
性粉体を使用するキャリアについては、電気抵抗や帯電
性を制御するために樹脂被覆が行われおり、この皮膜形
成法として溶剤に溶解させた樹脂を吹きつけるスプレィ
ドライ法などが行われている。In addition, carriers using magnetic powder such as Fe, r-Fe2O2, Pe5os, etc. are coated with resin to control electrical resistance and chargeability, and the coating is formed using resin dissolved in a solvent. Spray-drying methods are also used.
然し、溶剤を使用するためにキャリアの帯電性が劣化す
ると共に膜厚制御が困難であり、また樹脂被覆したキャ
リア同士が凝集し易いなどの問題があった。However, since a solvent is used, the chargeability of the carrier deteriorates, it is difficult to control the film thickness, and the resin-coated carriers tend to aggregate with each other.
上記の問題は磁性粉の表面に該磁性粉の粒径よりも小さ
い粒径をもち、ガラス転移点が２００°Ｃ以下の第１の
樹脂よりなる粉末を静電付着させた後、該第１の樹脂よ
りなる粉末を熱溶融させることにより、前記磁性粉の表
面に該第１の樹脂よりなる樹脂層を形成した後、該樹脂
層の上に圧縮破壊強度が１０Ｋｇ／ 璽ｍ”以上をもつ
第２の樹脂よりなり、粒径が５μｍ以下の球状樹脂を固
定させた二成分現像剤用キャリアの使用により解決する
ことができる。The above problem can be solved by electrostatically adhering powder made of a first resin having a particle size smaller than that of the magnetic powder and having a glass transition point of 200°C or less on the surface of the magnetic powder. A resin layer made of the first resin is formed on the surface of the magnetic powder by thermally melting powder made of the resin, and then a compressive breaking strength of 10 kg/m" or more is formed on the resin layer. This problem can be solved by using a carrier for a two-component developer on which a spherical resin made of the second resin and having a particle size of 5 μm or less is fixed.
第１図（Ａ）〜（Ｄ）は本発明に係るキャリアの製造工
程を示す断面図であって、同図（Ａ）に示すＦｅ＋
ｒ−ＦｅｔＯｓ＋Ｆｅ５０４などの磁性粉１の表面に、
第１の樹脂よりなり小粒径の樹脂粉末２を磁性粉１の表
面に静電付着させる。（以上同図Ｂ）次に、この樹脂粉
末２を熱溶融させて磁性粉ｌの表面に第１の樹脂を被覆
させて樹脂層３を形成する。（以上同図Ｃ）
次に、この樹脂層３の表面に第２の樹脂よりなる球状の
樹脂粉末４を融着固定することにより二層被覆キャリア
５を形成する。（以上同図Ｄ）このような条件を満たす
ためには、第１の樹脂はガラス転移点が２００℃以下の
溶は易い樹脂であることが必要で、か−る樹脂としては
ポリエチレン、ポリアクリル酸エステル、ポリメチルメ
タクリレート、ポリスチレンなどがある。FIGS. 1(A) to 1(D) are cross-sectional views showing the manufacturing process of the carrier according to the present invention, in which Fe+
On the surface of magnetic powder 1 such as r-FetOs+Fe504,
Resin powder 2 made of a first resin and having a small particle size is electrostatically adhered to the surface of magnetic powder 1. (B in the same figure) Next, this resin powder 2 is thermally melted to coat the surface of the magnetic powder 1 with a first resin to form a resin layer 3. (C in the same figure) Next, a two-layer coated carrier 5 is formed by fusion-fixing spherical resin powder 4 made of a second resin onto the surface of this resin layer 3. (See Figure D) In order to satisfy these conditions, the first resin must be an easily melted resin with a glass transition point of 200°C or less, such resins include polyethylene and polyacrylic. These include acid esters, polymethyl methacrylate, and polystyrene.
なお、樹脂粉末２は同図（Ｂ）においては判り易くする
ために球状としたが任意の形状であっても差支えない。Although the resin powder 2 is shown as spherical in FIG. 2B for ease of understanding, it may have any shape.
次に、樹脂粉末４を構成する第２の樹脂は融点が高く、
球状で、また圧縮破壊強度が１０Ｋｇ／ ｍ”以上と高
いことが必要である。Next, the second resin constituting the resin powder 4 has a high melting point,
It needs to be spherical and have a high compressive fracture strength of 10 kg/m" or more.
その理由は第１の樹脂からなる樹脂粉末２を熱溶融させ
たり、第２の樹脂からなる樹脂粉末４を第１の樹脂から
なる樹脂層３に固定させる仕事は磁性粉を高速で板に衝
突させた時に発生する衝突エネルギーを用いて行うから
である。The reason for this is that the work of thermally melting the resin powder 2 made of the first resin and fixing the resin powder 4 made of the second resin to the resin layer 3 made of the first resin involves colliding the magnetic powder against the plate at high speed. This is because the collision energy generated when the collision occurs is used.
これらのことから第２の樹脂は硬（且つ融点が高いこと
が必要で、この条件を満たす樹脂としてはベンゾグアナ
ミン樹脂を挙げることができる。For these reasons, the second resin needs to be hard (and have a high melting point), and benzoguanamine resin can be cited as a resin that satisfies this condition.
なお、第２の樹脂からなる樹脂粉末４は樹脂層３の周り
に付着して表面積を拡大させることが目的であるから粒
径は磁性粉１に較べて格段に小さいことが必要で、粒径
０．０５〜５μｍ望ましくは０゜１〜２μｍのものを使
用すると良い。Note that the purpose of the resin powder 4 made of the second resin is to adhere around the resin layer 3 and expand the surface area, so the particle size needs to be much smaller than that of the magnetic powder 1. It is preferable to use one having a diameter of 0.05 to 5 μm, preferably 0°1 to 2 μm.
以下、第１図を用いて実施例を説明する。 Hereinafter, an embodiment will be described using FIG. 1.
実施例１：
第１図（Ａ）に示す磁性粉１として粒径が６０μｍのフ
ェライト（Ｔ−Ｆｅａｒｓ）を用い、また同図（Ｂ）に
示す樹脂粉末２として粒径が０．４μｍでガラス転移点
が１３０℃のポリメチルメタクリレート（以下略称ＰＭ
ＭＡ）を選んだ。Example 1: Ferrite (T-Fears) with a particle size of 60 μm was used as the magnetic powder 1 shown in FIG. 1(A), and glass with a particle size of 0.4 μm was used as the resin powder 2 shown in FIG. 1(B). Polymethyl methacrylate (hereinafter abbreviated as PM) has a transition point of 130°C.
MA) was selected.
そして、ｒ −Ｆｅ２Ｏ２を８０重量部、またＰＭＭＡ
を２０重量部とり、ヘンシェルミキサ（Ｆ？ｌ−１０Ｂ
型、三井三池エンジニアリング）を用いて混合し、回転
数１５０Ｏｒｐｍで回転させることにより、同図（Ｂ）
に示すように磁性粉１の上にＰＭＭＡよりなる樹脂粉末
２を静電的に付着させた。Then, 80 parts by weight of r-Fe2O2 and PMMA
Take 20 parts by weight of
(B)
As shown in the figure, resin powder 2 made of PMMA was electrostatically adhered onto magnetic powder 1.
次に、これを遠心回転型混合機（メカノミル聞１０、開
田精工）に投入し２００Ｏｒｐｍで回転させて混合を行
い、樹脂粉末２を熱溶融させて同図（Ｃ）に示すように
磁性粉１の上にＰＭＭＡよりなる樹脂層３を形成した。Next, this was put into a centrifugal rotary mixer (Mechanomill 10, Kaida Seiko) and mixed by rotating at 200 rpm to heat-melt the resin powder 2 and form the magnetic powder 1 as shown in the same figure (C). A resin layer 3 made of PMMA was formed thereon.
次に、粒径が０．３μｍの真球で圧縮破壊強度が１４
Ｋｇ７ｍ２のベンゾグアナミン・ホルムアルデヒド縮合
物（品名エポスター 日本触媒工業■）からなる樹脂粉
末４と樹脂層３を被覆した磁性粉１とを混合し、先と同
様にヘンシェルミキサを用いて樹脂粉末４を静電吸着さ
せた後、遠心回転型混合機で機内の衝突板に衝突させて
樹脂粉末４を真球状のままＰＭＭＡよりなる樹脂層３に
固定させた。Next, a true sphere with a particle size of 0.3 μm has a compressive fracture strength of 14
Kg7m2 of a resin powder 4 made of a benzoguanamine formaldehyde condensate (product name: Epostor Nippon Shokubai Kogyo ■) and magnetic powder 1 coated with a resin layer 3 are mixed, and the resin powder 4 is electrostatically treated using a Henschel mixer in the same manner as before. After adsorption, the resin powder 4 was caused to collide with a collision plate in the machine using a centrifugal mixer to fix the resin powder 4 in a true spherical shape to the resin layer 3 made of PMMA.
次に、トナーとしては、
スチレン−アクリル樹脂（ハイマーＳＢＭ ６００．三
洋化成工業） ・・・９５重量部アゾ系染料（
ボントロン５−３７ オリエント化学）・・・ ２重
量部
カーボンブラック（Ｂｌａｃ、ｋ Ｐｅａｒｌ Ｌキャ
ボット）・・・ ３重量部
を溶融し混練した後、粉砕分級して平均粒径が１２μｍ
のトナーを作った。Next, as a toner, styrene-acrylic resin (Himer SBM 600. Sanyo Chemical Industries) ... 95 parts by weight azo dye (
Bontron 5-37 Orient Kagaku)... 2 parts by weight Carbon black (Blac, K Pearl L Cabot)... 3 parts by weight were melted and kneaded, then crushed and classified to have an average particle size of 12 μm.
I made toner.
このようにして得られた二層被覆キャリアとトナーとを
ボールミルを用いて混合攪拌し、二成分現像剤を作った
。The thus obtained two-layer coated carrier and toner were mixed and stirred using a ball mill to prepare a two-component developer.
か＼る現像剤はトナー濃度５〜４０重量％の範囲でトナ
ー比電荷が−１０〜−１５μＣ／ｇと非常に優れた帯電
性を示した。This developer exhibited very excellent charging properties, with a toner specific charge of -10 to -15 .mu.C/g in a toner concentration range of 5 to 40% by weight.
更に、熱ロール定着方式の市販複写機により印字試験を
行った結果、トナー濃度５〜４０重量％の範囲で画像背
景部のカブリやキャリア付着の少ない良好な画像が得ら
れ、トナー濃度許容幅を非常に広くすることができた。Furthermore, as a result of a printing test using a commercially available copying machine using a heat roll fixing method, good images were obtained with less fogging in the image background and less carrier adhesion at toner concentrations in the range of 5 to 40% by weight. It could be made very wide.
但し、トナー濃度５重量％以下では画像濃度が低下し、
またトナー濃度４０重量％以上ではトナー飛散が多くな
った。However, if the toner concentration is less than 5% by weight, the image density will decrease,
Further, when the toner concentration was 40% by weight or more, toner scattering increased.
次に、初期トナー濃度を３０重量％に設定して１００枚
の印字を行う毎に４ｇのトナーを補給しながら２０００
０枚の印字を行ったが初期と同等な画像を保つことがで
きた。Next, set the initial toner concentration to 30% by weight and replenish 4g of toner for every 100 sheets of printing.
Although 0 sheets of printing were performed, the image was able to be maintained at the same level as the initial image.
実施例２：
第１の樹脂としてガラス転移点が１００℃のスチレン−
アクリル樹脂からなる平均粒径０．５μｍの樹脂粉末を
用いた以外は実施例１と全く同様にして二層被覆キャリ
アを作り、実施例１と同じトナーと混合攪拌して二成分
現像剤を調整した。Example 2: Styrene with a glass transition point of 100°C as the first resin
A two-layer coated carrier was prepared in exactly the same manner as in Example 1, except that resin powder made of acrylic resin with an average particle size of 0.5 μm was used, and mixed and stirred with the same toner as in Example 1 to prepare a two-component developer. did.
カミる現像剤の帯電性は実施例１の現像剤とほぼ同等で
あった。The chargeability of the developing developer was almost the same as that of the developer of Example 1.
更に、実施例１と同様にして印字評価を行ったところ、
トナー濃度５〜４０重量％の範囲で画像背景部のカブリ
やキャリア付着の少ない良好な画像が得られた。Furthermore, when printing was evaluated in the same manner as in Example 1,
When the toner concentration was in the range of 5 to 40% by weight, good images with little fogging in the image background and little carrier adhesion were obtained.
また、トナーの転写性と定着性は良好であった。Furthermore, the toner transferability and fixability were good.
比較例１：
ベンゾグアナミン・ホルムアルデヒド縮金物からなる樹
脂粉末４を固定しない以外は実施例１と全く同様にして
一層被覆キャリアを作り、実施例１と同じトナーと混合
攪拌して二成分現像剤を調製した。Comparative Example 1: A single-layer coated carrier was prepared in exactly the same manner as in Example 1, except that the resin powder 4 made of a benzoguanamine formaldehyde metal condensate was not fixed, and mixed and stirred with the same toner as in Example 1 to prepare a two-component developer. did.
この現像剤はトナー濃度５〜３０重量％の範囲でトナー
比電荷が−５〜−１５μＣ／ｇとトナー比電荷のトナー
濃度依存性が実施例１と比較して強く、実施例１と同じ
トナーを用いてトナー濃度２０重。This developer has a toner specific charge of -5 to -15 μC/g in a toner concentration range of 5 to 30% by weight, and the toner density dependence of the toner specific charge is stronger than that of Example 1. Toner density 20 times using.
量％の現像剤を調製した後、印字試験を行ったところ著
しいキャリア付着およびカブリが発生した。When a printing test was conducted after preparing a developer of 10% by weight, significant carrier adhesion and fogging occurred.
比較例２：
第１の樹脂としてガラス転移点が２００℃以上のＰＭＭ
Ａを用い、これを用いて０．４ μｍの樹脂粉末を用い
た以外は実施例１と全く同様にして処理をしたところ、
ＰＭＭＡのガラス転移点が高いために遠心回転型混合機
による衝突エネルギーでは熔融せず、そのため磁性粉ｌ
の上に樹脂層３を形成することができなかった。Comparative Example 2: PMM with a glass transition point of 200°C or higher as the first resin
A was treated in exactly the same manner as in Example 1 except that 0.4 μm resin powder was used.
Because PMMA has a high glass transition point, it cannot be melted by the collision energy of a centrifugal mixer, so magnetic powder
It was not possible to form the resin layer 3 thereon.
比較例３：
第２の樹脂として圧縮破壊強度が０．５Ｋｇ／ｎ＋２の
ＰＭＭＡを用いた以外は実施例１と全く同様にして二層
被覆キャリアを作ったが、樹脂粉末４の圧縮破壊強度が
弱いために形が潰れ、キャリアの表面積を増すことがで
きなかった。Comparative Example 3: A two-layer coated carrier was made in the same manner as in Example 1 except that PMMA with a compressive breaking strength of 0.5 Kg/n+2 was used as the second resin, but the compressive breaking strength of Resin Powder 4 was Due to its weakness, the shape was crushed and the surface area of the carrier could not be increased.
得られた現像剤はトナー濃度５〜３０重量％の範囲でト
ナー比電荷が−５〜−１５μＣ／ｇとトナー比電荷のト
ナー濃度依存性が実施例１と比較して強く、またキャリ
ア個々により帯電性のバラツキがあるため、実施例１と
同じトナーを用い、トナー濃度２０重量％の現像剤を作
って印字評価を行ったところ、著しいキャリア付着およ
びカブリが発生した。The obtained developer had a toner specific charge of -5 to -15 μC/g at a toner concentration of 5 to 30% by weight, and the dependence of the toner specific charge on the toner concentration was stronger than in Example 1. Because of the variation in chargeability, when a developer was prepared using the same toner as in Example 1 and had a toner concentration of 20% by weight and evaluated for printing, significant carrier adhesion and fogging occurred.
本発明によれば磁性粉の上に均一に樹脂層を形成するこ
とができるため、帯電性のバラツキのない優れた帯電性
を実現でき、また表面積が広くなるために、トナー濃度
マージンを拡大することができる。According to the present invention, it is possible to uniformly form a resin layer on the magnetic powder, so it is possible to achieve excellent charging properties with no variation in charging properties, and since the surface area is increased, the toner concentration margin can be expanded. be able to.
第１図（Ａ）〜（Ｄ）は本発明に係るキャリアの製造工
程を示す断面図である。
図において、
１、は磁性粉、 ２．４は樹脂粉末、３は樹脂
層、 ５は二層被覆キャリアである。FIGS. 1A to 1D are cross-sectional views showing the manufacturing process of a carrier according to the present invention. In the figure, 1 is a magnetic powder, 2.4 is a resin powder, 3 is a resin layer, and 5 is a two-layer coated carrier.
Claims (1)
ち、ガラス転移点が２００℃以下の第１の樹脂よりなる
粉末を静電付着させた後、該第１の樹脂よりなる粉末を
熱溶融させ、前記磁性粉の表面に該第１の樹脂よりなる
樹脂層を形成した後、該樹脂層の上に圧縮破壊強度が１
０Ｋｇ／ｍｍ＾２以上をもつ第２の樹脂よりなり、粒径
が５μｍ以下の球状樹脂を固定させることを特徴とする
二成分現像剤用キャリアの製造方法。After electrostatically adhering a powder made of a first resin having a particle size smaller than that of the magnetic powder and having a glass transition point of 200°C or less on the surface of the magnetic powder, a powder made of the first resin is prepared. After forming a resin layer made of the first resin on the surface of the magnetic powder, a compressive fracture strength of 1 is formed on the resin layer.
A method for producing a carrier for a two-component developer, characterized in that a spherical resin made of a second resin having a particle size of 0 Kg/mm^2 or more and having a particle size of 5 μm or less is fixed therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62267122A JPH01108558A (en) | 1987-10-22 | 1987-10-22 | Production of carrier for two-component developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62267122A JPH01108558A (en) | 1987-10-22 | 1987-10-22 | Production of carrier for two-component developer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01108558A true JPH01108558A (en) | 1989-04-25 |
Family
ID=17440375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62267122A Pending JPH01108558A (en) | 1987-10-22 | 1987-10-22 | Production of carrier for two-component developer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01108558A (en) |
-
1987
- 1987-10-22 JP JP62267122A patent/JPH01108558A/en active Pending
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