JPH03263052A - Carrier for two-component developer for dry processing - Google Patents
Carrier for two-component developer for dry processingInfo
- Publication number
- JPH03263052A JPH03263052A JP2063410A JP6341090A JPH03263052A JP H03263052 A JPH03263052 A JP H03263052A JP 2063410 A JP2063410 A JP 2063410A JP 6341090 A JP6341090 A JP 6341090A JP H03263052 A JPH03263052 A JP H03263052A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- layer
- resin
- inner layer
- carrier core
- 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
- 229920005989 resin Polymers 0.000 claims abstract description 68
- 239000011347 resin Substances 0.000 claims abstract description 68
- 239000003086 colorant Substances 0.000 claims description 6
- 229920002050 silicone resin Polymers 0.000 abstract description 16
- 230000015556 catabolic process Effects 0.000 abstract 2
- 238000006731 degradation reaction Methods 0.000 abstract 2
- 230000001070 adhesive effect Effects 0.000 abstract 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 12
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 11
- 150000001875 compounds Chemical class 0.000 description 10
- 229920001296 polysiloxane Polymers 0.000 description 10
- 238000000576 coating method Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000969 carrier Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- JZZIHCLFHIXETF-UHFFFAOYSA-N dimethylsilicon Chemical compound C[Si]C JZZIHCLFHIXETF-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000001055 blue pigment Substances 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 239000003822 epoxy resin Substances 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
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 1
- 229920005792 styrene-acrylic resin Polymers 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
Landscapes
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は、電子写真法の現像工程において、トナーとと
もに用いられる乾式2成分現像剤用キャリアに関し、さ
らに詳しくはキャリアの劣化による画質の低下を解消し
た乾式2成分現像剤用キャリアに関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a carrier for a dry two-component developer used together with toner in the development process of electrophotography, and more specifically, to a carrier for a dry two-component developer used with toner in a developing process of electrophotography. The present invention relates to a carrier for a dry two-component developer that has been resolved.
(従来の技術)
電子写真複写機において、感光体に形成された静電潜像
を乾式現像法により可視化するため、トナーとキャリア
が混合された2成分現像剤を用いた磁気ブラシ現像法が
従来から行われている。(Prior Art) In an electrophotographic copying machine, in order to visualize an electrostatic latent image formed on a photoreceptor by a dry development method, a magnetic brush development method using a two-component developer containing a toner and a carrier has been conventionally used. It has been carried out since.
かかる2成分現像剤は帯電特性の異なるトナーとキャリ
アがそれぞれ接触によりそれぞれ反対極性の摩擦帯電を
帯び、キャリア表面上にトナーが吸引保持されているも
のであり、これが感光体表面の静電潜像に接触するとト
ナーと潜像の吸引力がキャリアとトナーとの間の吸引力
に打ち勝って潜像上にトナーが付着して現像が行われる
。In such a two-component developer, toner and carrier, which have different charging characteristics, each become triboelectrically charged with opposite polarity when they come into contact with each other, and the toner is attracted and held on the surface of the carrier, which forms an electrostatic latent image on the surface of the photoreceptor. When the toner contacts the latent image, the attraction force between the toner and the latent image overcomes the attraction force between the carrier and the toner, the toner adheres to the latent image, and development is performed.
ところで、従来よりスペント現象の防止及びキ中リアの
抵抗を調整して画質を向上させるためにキャリアとして
樹脂で被覆された被覆キャリアが使用されている。しか
し、このような現像剤を用いて長期間複写作業を行った
場合には、現像中にキャリアの樹脂層が摩擦や剥離等に
よって減少し、キャリアの電気抵抗率が低下するという
現象が起きる。その結果、画像濃度が上昇し、文字潰れ
、前ビキ等の画質劣化を引き起こすという問題がある。Incidentally, coated carriers coated with resin have been conventionally used as carriers in order to prevent the spent phenomenon and to improve image quality by adjusting the resistance in the middle and rear. However, when copying is performed for a long period of time using such a developer, a phenomenon occurs in which the resin layer of the carrier is reduced by friction, peeling, etc. during development, and the electrical resistivity of the carrier is reduced. As a result, there is a problem in that the image density increases, causing deterioration in image quality such as crushed characters and blurring.
このような問題を解消するために、例えば樹脂層の硬度
の調整によって対策することが考えられる。In order to solve such problems, it is conceivable to take measures, for example, by adjusting the hardness of the resin layer.
(発明が解決しようとする課題)
しかし、樹脂層を硬質のもので形成すると耐衝撃性に劣
るために摩耗が起こり易くなり、逆に樹脂層を軟質のも
ので形成するとキャリアコアに対する密着性に劣り樹脂
層の剥離が起こり易くなり、いずれの場合も樹脂層の減
少を満足いくレベルで解消することはできない。また、
この樹脂層の減少の進行は使用環境等によって異なり、
しかもその進行程度は容易に知ることはできないため知
らない間に画像劣化が起こることになる。(Problem to be solved by the invention) However, if the resin layer is made of a hard material, the impact resistance will be poor and wear will easily occur.On the other hand, if the resin layer is made of a soft material, the adhesion to the carrier core will be poor. If the resin layer is inferior, the resin layer is likely to peel off, and in either case, the reduction in the resin layer cannot be solved to a satisfactory level. Also,
The progress of this reduction in the resin layer varies depending on the usage environment, etc.
Moreover, since it is not easy to know the extent of the progress, image deterioration will occur without your knowledge.
本発明は、上記の問題を解決したものであり、その目的
とするところは、現像器内におけるキャリアの抵抗率が
低下することによる画質劣化を防止し長期間に亘って良
好な画質が得られる乾式2成分現像剤用キャリアを提供
することにある。本発明の他の目的は、キャリアコアの
外面に積層した樹脂層の摩耗が生じた場合でもその摩耗
程度を簡便に知ることができる乾式2成分現像剤用キャ
リアを提供することにある。The present invention has solved the above problem, and its purpose is to prevent image quality deterioration due to a decrease in the resistivity of the carrier in the developing device, and to obtain good image quality over a long period of time. An object of the present invention is to provide a carrier for a dry two-component developer. Another object of the present invention is to provide a carrier for a dry two-component developer in which the degree of abrasion of the resin layer laminated on the outer surface of the carrier core can be easily determined even when the resin layer is abraded.
(課題を解決するための手段)
本発明の乾式2成分現像剤用キャリアは、キャリアコア
と、該キャリアコアの外面に積層された樹脂からなる内
層と、該内層の外面に積層された樹脂からなる外層と、
を有する乾式2成分現像剤用キャリアであって、該内層
を形成する樹脂と該外層を形成する樹脂は同種の樹脂に
て形成され、且つ内層の硬度は外層の硬度に比して高く
設定されており、そのことにより上記目的が達成される
。(Means for Solving the Problems) The carrier for a dry two-component developer of the present invention includes a carrier core, an inner layer made of a resin laminated on the outer surface of the carrier core, and a resin layer laminated on the outer surface of the inner layer. The outer layer becomes
A carrier for a dry two-component developer, wherein the resin forming the inner layer and the resin forming the outer layer are made of the same type of resin, and the hardness of the inner layer is set higher than the hardness of the outer layer. This achieves the above objectives.
また、本発明の他の乾式2成分現像剤用キャリアは、キ
ャリアの電気抵抗率がs、 ox 1oj〜5.0X1
011(Ωam)にあり、上記キャリアコアに上記内層
のみが積層された状態の電気抵抗率は該キャリアの電気
抵抗率の0.2〜0.5倍であり、そのことにより上記
目的が達成される。上記内層と外層は異色の樹脂にて形
成されているのが好ましい。Further, in another carrier for a dry two-component developer of the present invention, the electrical resistivity of the carrier is s, ox 1 oj to 5.0 x 1
011 (Ωam), and the electrical resistivity in a state where only the inner layer is laminated on the carrier core is 0.2 to 0.5 times the electrical resistivity of the carrier, thereby achieving the above object. Ru. Preferably, the inner layer and outer layer are made of resins of different colors.
以下に、図面を参照しながら本発明を説明する。The present invention will be described below with reference to the drawings.
第1図には本発明の乾式2成分現像剤用キャリアの断面
が示され、このキャリアはキャリアコア1とキャリアコ
ア1の外面に積層された樹脂からなる内層2と該内層2
の外面に積層された樹脂からなる外層3とを有している
。FIG. 1 shows a cross section of a carrier for a dry two-component developer of the present invention, which includes a carrier core 1, an inner layer 2 made of resin laminated on the outer surface of the carrier core 1, and
It has an outer layer 3 made of resin laminated on the outer surface of.
本発明に用いられるキャリアコアlとしては、酸化また
は未酸化の鉄粉、ニッケル、コバルト、フェライト等の
未被覆キャリアがあげられ、特に球形のフェライトが好
ましい。そのキャリアコア1の中心粒径は通常15〜2
00μ箇であり、50〜150μmが好ましい。Examples of the carrier core l used in the present invention include uncoated carriers such as oxidized or unoxidized iron powder, nickel, cobalt, and ferrite, with spherical ferrite being particularly preferred. The center particle size of the carrier core 1 is usually 15 to 2
00 μm, preferably 50 to 150 μm.
上記キャリアコアlの外面に積層された内層2と外層3
を形成する樹脂としては、従来よりコーティング用とし
て使用されている各種の樹脂が使用され、例えば、スチ
レン系重合体、アクリル系重合体、フッ素樹脂系重合体
、ポリエステル、シリコーン樹脂、メラミン樹脂、ポリ
カーボネート、エポキシ樹脂等の重合体があげられ、ス
ペント化防止の点で特にシリコーン樹脂が好ましい。Inner layer 2 and outer layer 3 laminated on the outer surface of the carrier core l
Various resins conventionally used for coatings are used as the resin for forming the coating, such as styrene polymers, acrylic polymers, fluororesin polymers, polyesters, silicone resins, melamine resins, and polycarbonates. , epoxy resins and other polymers, and silicone resins are particularly preferred from the viewpoint of preventing spent.
上記内層2を形成する樹脂と外層3を形成する樹脂は同
種の樹脂にて形成されており、内層2と外層3の結着性
が高められる。例えば、内層2をシリコーン樹脂で形成
した場合には外層3もシリコーン樹脂で形成されている
。そして、内層2の硬度は外層3の硬度に比して高く設
定される。硬度の翼なる内層2と外層3を形成するには
、内層2を形成する樹脂と外層3を形成する樹脂の分子
量、架橋密度、層の形成条件等を変えることにより行う
ことができる。例えば、内層2及び外層3をシリコーン
樹脂にて形成する場合には、内層2を形成する樹脂とし
て一般式が次式(1)で表されるモノメチルシリコン化
合物を主成分としてなるシリコーン樹脂を用い、外層3
を形成する樹脂として上記モノメチルシリコン化合物と
一般式が次式(2)で表されるジメチルシリコン化合物
とを主成分としてなるシリコーン樹脂を用いるのが好ま
しい。The resin forming the inner layer 2 and the resin forming the outer layer 3 are made of the same type of resin, and the binding property between the inner layer 2 and the outer layer 3 is improved. For example, when the inner layer 2 is made of silicone resin, the outer layer 3 is also made of silicone resin. The hardness of the inner layer 2 is set higher than that of the outer layer 3. In order to form the inner layer 2 and outer layer 3, which are wings of hardness, it can be done by changing the molecular weight, crosslinking density, layer formation conditions, etc. of the resin forming the inner layer 2 and the resin forming the outer layer 3. For example, when forming the inner layer 2 and the outer layer 3 with silicone resin, use a silicone resin whose main component is a monomethyl silicone compound whose general formula is represented by the following formula (1) as the resin forming the inner layer 2, outer layer 3
It is preferable to use a silicone resin whose main components are the above-mentioned monomethyl silicone compound and a dimethyl silicon compound whose general formula is represented by the following formula (2).
5i(ORhCHa ・・・ (1)St
(OR)2(CH3)2 ・・・ (2)(式中
、Rはアルキル基を表す)
この場合において、内層2はモノメチルシリコン化合物
を主成分としてなるシリコーン樹脂にて形成されること
により、外層3に比べてキャリアコア1に対する密着性
に優れている。この理由は、内層形成用樹脂は、キャリ
アコア1表面の活性基と水素結合し得る水酸基を多く有
しているためと、内層形成用樹脂は外層形成用樹脂に比
べて高硬度の被膜を形成し得るためと推測される。また
、外層3は上記モノメチルシリコン化合物と上記ジメチ
ルシリコン化合物とを主成分としてなるシリコ、−ン樹
脂にて形成されていることにより、内層2に比べてより
弾性を有することになり耐衝撃性等の力学物性が改善さ
れる。内層2を形成する樹脂として、モノメチルシリコ
ン化合物と少量のジメチルシリコン化合物とを成分とし
て得られるシリコーン樹脂を用いてもよく、この場合に
は外層3を形成する樹脂としてジメチルシリコン化合物
の比率を内層形成用樹脂に比べて上げるのがよい。5i(ORhCHa... (1) St
(OR)2(CH3)2... (2) (in the formula, R represents an alkyl group) In this case, the inner layer 2 is formed of a silicone resin mainly composed of a monomethyl silicone compound, so that It has better adhesion to the carrier core 1 than the outer layer 3. The reason for this is that the inner layer forming resin has many hydroxyl groups that can hydrogen bond with the active groups on the surface of the carrier core 1, and the inner layer forming resin forms a coating with higher hardness than the outer layer forming resin. It is assumed that this is because it is possible. In addition, since the outer layer 3 is made of a silicone resin mainly composed of the monomethyl silicone compound and the dimethyl silicone compound, it has more elasticity than the inner layer 2, so it has better impact resistance, etc. The mechanical properties of the material are improved. As the resin forming the inner layer 2, a silicone resin obtained by using a monomethyl silicone compound and a small amount of a dimethyl silicone compound as components may be used. It is better to increase the amount compared to commercial resins.
このように、本発明のキャリアでは、その表面からキャ
リアコアに至るまで樹脂層に硬度の勾配が形成されてお
り、表面は弾性に富むことから耐衝撃性があり、内層2
は高硬度でキャリアコア1との密着性に富むために、樹
脂層の摩耗と剥離が抑制され、現像剤の性能維持特性を
改善することができる。In this way, in the carrier of the present invention, a hardness gradient is formed in the resin layer from the surface to the carrier core, and the surface is highly elastic and has impact resistance.
Since it has high hardness and excellent adhesion to the carrier core 1, abrasion and peeling of the resin layer can be suppressed, and the performance maintenance characteristics of the developer can be improved.
また、キャリアコア1と内層2と外層3とを有する乾式
2成分現像剤用キャリアにおいて、内層2と外層3を異
色の樹脂にて形成してもよく、内層2は、染料、顔料等
の着色剤で着色し外層3は未着色とするか、あるいは外
層3を内層2とは異なる色の着色剤で着色してもよい。Further, in a carrier for a dry two-component developer having a carrier core 1, an inner layer 2, and an outer layer 3, the inner layer 2 and the outer layer 3 may be formed of resins of different colors, and the inner layer 2 may be colored with dyes, pigments, etc. The outer layer 3 may be colored with a colorant and the outer layer 3 may be left uncolored, or the outer layer 3 may be colored with a colorant different from that of the inner layer 2.
この場合、樹脂層の摩耗が進行したとしても抵抗率が大
きく変動しない範囲で樹脂層の減少を確認することがで
き、現像剤の寿命あるいは交換時期を知ることができる
。In this case, even if the resin layer wears out, the decrease in the resin layer can be confirmed within a range where the resistivity does not change significantly, and it is possible to know the lifespan of the developer or the time to replace it.
キャリアコアlに内層2及び外層3を積層した状態の本
発明のキャリアの電気抵抗率は、5.OX 109〜5
.0XIO”の範囲とするのがよい。また、キャリアコ
ア1に内層2を積層した状態のキャリアBの電気抵抗率
は上記電気抵抗率の0.2〜0.5倍とするのが好まし
い。つまり、キャリアコア1に内層2のみを積層したキ
ャリアBの電気抵抗率を、複写作業においてそのキャリ
アを用いた現像剤によって良好な画像を形成するのに必
要な下限値とすることにより、外層3が摩耗したとして
も内層2が露出し始めるまでは良好な画像が形成される
と判断できる。従って、第1図(a)〜(b)に示すよ
うに、複写作業によって外層3が摩耗している段階では
キャリアは所望範囲の電気抵抗率を有しており、さらに
外層3の摩耗が進んで第1図(C)に示すように内層2
0色が視認できた時点で別の新しいキャリアと取り替え
ればよい。The electrical resistivity of the carrier of the present invention in which the inner layer 2 and the outer layer 3 are laminated on the carrier core l is 5. OX 109~5
.. The electrical resistivity of the carrier B in which the inner layer 2 is laminated on the carrier core 1 is preferably in the range of 0.2 to 0.5 times the above electrical resistivity. By setting the electrical resistivity of the carrier B, which is a carrier core 1 with only the inner layer 2 laminated thereon, as the lower limit value necessary for forming a good image with a developer using the carrier in a copying operation, the outer layer 3 is Even if the inner layer 2 is worn out, it can be determined that a good image is formed until the inner layer 2 starts to be exposed.Therefore, as shown in FIGS. At this stage, the carrier has an electrical resistivity within a desired range, and as the outer layer 3 wears out further, the inner layer 2 deteriorates as shown in FIG. 1(C).
As soon as color 0 is visible, it is sufficient to replace it with another new carrier.
本発明の現像剤用キャリアを製造するには、種々の方法
が採用できる。例えば、流動床型塗布装置を用いてキャ
リアコア1の表面に樹脂溶液を塗布乾燥して内層2を形
成し、その後内層2の表面に別の樹脂溶液を塗布乾燥し
て外層3を形成すればよい。樹脂溶液に着色剤を添加し
ておけば着色した樹脂層が形成される。Various methods can be employed to produce the developer carrier of the present invention. For example, if a resin solution is applied to the surface of the carrier core 1 using a fluidized bed coating device and dried to form the inner layer 2, then another resin solution is applied to the surface of the inner layer 2 and dried to form the outer layer 3. good. If a coloring agent is added to the resin solution, a colored resin layer is formed.
このようにして得られた本発明の現像剤用キャリアはト
ナーと混合されて現像剤が調製される。The developer carrier of the present invention thus obtained is mixed with a toner to prepare a developer.
トナーとしては、従来より公知のものが使用され、例え
ば、スチレン−アクリル共重合樹脂とカーボンブラック
等とを熱溶融して、混練粉砕、分級したもの、あるいは
これらにシリカ等の表面処理剤を混合して表面処理した
ものが使用できる。Conventionally known toners are used as toners, such as those obtained by heat-melting styrene-acrylic copolymer resin and carbon black, kneading, crushing, and classifying, or mixing them with a surface treatment agent such as silica. Surface treated products can be used.
(実施例)
以下、実施例によって本発明をより詳細に説明するが、
本発明はこれによって限定されるものではない。(Example) Hereinafter, the present invention will be explained in more detail with reference to Examples.
The present invention is not limited thereby.
K血豆エ
メチルシリコーン樹脂(縮合体がモノメチルシリコン化
合物からなるもの(CH3/5is1.O)、信越化学
社製、lR251) 10重量部をトルエン10重量部
に溶解して樹脂溶液Aを調製した。Resin solution A was prepared by dissolving 10 parts by weight of K blood bean methyl silicone resin (a condensate consisting of a monomethyl silicone compound (CH3/5is1.O), manufactured by Shin-Etsu Chemical Co., Ltd., 1R251) in 10 parts by weight of toluene.
メチルシリコーン樹脂(縮合体がジメチルシリコン化合
物からなるもの(C1h/St>1.0)、信越化学社
製、にR255) 10重量部をトルエン20重量部に
溶解して樹脂溶液Bを調製した。Resin solution B was prepared by dissolving 10 parts by weight of methyl silicone resin (condensation product consisting of dimethyl silicon compound (C1h/St>1.0), manufactured by Shin-Etsu Chemical Co., Ltd., R255) in 20 parts by weight of toluene.
次に、平均粒径が100μ層の球形酸化磁性鉄1000
重量部の表面に流動床型塗布装置を用いてA溶液を塗布
した。A溶液を塗布した後、次にB溶液を塗布すること
により樹脂層を形成させた。このようにして、樹脂層と
キャリアコアとの元素量比Si/Feが0.16.0.
18の2種類のキャリアを得た。なお、この元素量比S
i/Faは、樹脂層の量とキャリアコアの量を元素分析
によって求めたものである。Next, 1000 pieces of spherical magnetic iron oxide with an average particle size of 100μ layer
Solution A was applied to the surface of the weight part using a fluidized bed type coating device. After applying solution A, solution B was then applied to form a resin layer. In this way, the elemental ratio Si/Fe between the resin layer and the carrier core is 0.16.0.
I got 18 two types of carriers. In addition, this elemental amount ratio S
i/Fa is the amount of resin layer and carrier core determined by elemental analysis.
一方、スチレン−アクリル樹脂とカーボンブラック等を
熱溶融して混練粉砕、分級し、及びこれにシリカにて表
面処理してトナーを得た。次いで、上記で得られた28
i類のキャリアとトナーとをそれぞれ、トナー濃度が3
.2%となるよう混合して2種類の現像剤を得た。得ら
れた各現像剤について、電子写真複写機DC−2585
(三田工業■製)を用いて画像出しを行い3万枚の複写
試験を行った。On the other hand, styrene-acrylic resin, carbon black, etc. were thermally melted, kneaded, pulverized, and classified, and then surface-treated with silica to obtain a toner. Then, 28 obtained above
Type i carrier and toner each have a toner concentration of 3.
.. Two types of developers were obtained by mixing them at a concentration of 2%. For each developer obtained, an electrophotographic copying machine DC-2585 was used.
(manufactured by Sanda Kogyo ■) was used to produce images, and a 30,000 copy test was conducted.
その結果、3万枚ランニング後においても当初の画像と
同等の品位の画像が得られた。また、各キャリアa及び
bのキャリアコアに対する樹脂層の元素量比St/Fe
の変動を測定したところ第2図に示す通りであり、Si
/Fe比が0.18のもの(第2図中aで示される)は
0.17、Si/Fe比が0.16のもの(第2図中す
で示される)は0.14となり、いずれも樹脂層の摩耗
、剥離による減少は少なかった。As a result, even after running 30,000 copies, an image with the same quality as the original image was obtained. In addition, the elemental ratio St/Fe of the resin layer to the carrier core of each carrier a and b
The fluctuation of Si was measured, as shown in Figure 2.
/Fe ratio of 0.18 (indicated by a in Fig. 2) is 0.17, Si/Fe ratio of 0.16 (indicated in Fig. 2) is 0.14, In both cases, there was little decrease due to wear and peeling of the resin layer.
よ笠五
上記キャリアコアにA溶液を塗布乾燥しなかった以外は
、実施例1と同様にしてキャリアを得た。Yokasa 5 A carrier was obtained in the same manner as in Example 1, except that solution A was not applied to the carrier core and dried.
得られたキャリアについて、実施例1と同様に画像出し
を行ったところ、3万枚ランニング後において画像が当
初の画像に比べて太き(低下した。When the obtained carrier was imaged in the same manner as in Example 1, the image became thicker (lower) than the original image after running 30,000 sheets.
また、キャリアのキャリアコアに対する樹脂層の元素量
比Si/Peを測定したところ東2図に示す通りであり
(第2図中、Cで示される)、Si/Fe比が0.22
から0.12に低下した。これは樹脂層が摩耗または剥
離したことを示している。In addition, when the elemental ratio Si/Pe of the resin layer to the carrier core of the carrier was measured, it was as shown in Fig. 2 (indicated by C in Fig. 2), and the Si/Fe ratio was 0.22.
It decreased from 0.12 to 0.12. This indicates that the resin layer has been worn or peeled off.
L1五主
メチルシリコーン樹脂(縮合体がモノメチルシリコン化
合物からなるもの(C1h/Sih 1゜O)、ffi
越化学社製、にR251) 12.5重量部と青色顔料
(#!フタロシアニン)1.0重量部をトルエン12.
5重量部に溶解して樹脂溶液Cを調製した。L1 pentamethyl silicone resin (condensate consisting of monomethyl silicone compound (C1h/Sih 1°O), ffi
12.5 parts by weight of R251 (manufactured by Etsu Kagaku Co., Ltd.) and 1.0 parts by weight of blue pigment (#! phthalocyanine) were added to 12.5 parts by weight of toluene.
Resin solution C was prepared by dissolving 5 parts by weight.
メチルシリコーン樹脂(縮合体がジメチルシリコン化合
物からなるもの(C1h/St> 1.0)) 30.
0重量部をトルエン30.0重量部に溶解して樹脂溶液
りを調製した。Methyl silicone resin (condensate consisting of dimethyl silicone compound (C1h/St>1.0)) 30.
A resin solution was prepared by dissolving 0 parts by weight in 30.0 parts by weight of toluene.
次に、平均粒径100μ置の球形酸化磁性鉄1000重
量部の表面に流動床型塗布装置を用いてC溶液を塗布し
た。キャリアコアにC溶液のみを塗布乾燥して得たキャ
リアの電気抵抗率は約lXl0”(ΩC■)であった。Next, the C solution was coated on the surface of 1000 parts by weight of spherical magnetic iron oxide having an average particle size of 100 μm using a fluidized bed coating device. The electrical resistivity of the carrier obtained by coating only the C solution on the carrier core and drying it was about 1X10'' (ΩC■).
C溶液を塗布した後、次にD溶液を塗布乾燥することに
より樹脂層を形成した。このようにして、内層が青色に
着色され外層が未着色であるキャリアを得た。得られた
キャリアの電気抵抗率は、約S X tow・(0cm
)であった。After applying Solution C, Solution D was then applied and dried to form a resin layer. In this way, a carrier was obtained in which the inner layer was colored blue and the outer layer was uncolored. The electrical resistivity of the obtained carrier is approximately S X tow (0 cm
)Met.
このキャリアと実施例1で得られたトナーとをそれぞれ
トナー濃度が3.2%となるよう混合して現像剤を得た
。得られた現像剤について、実施例1と同様に電子写真
複写機DC−2585(三田工業■製)を用いて画像出
しを行い3万枚の複写試験を行った。その結果、3万枚
ランニング後において、キャリアの表面が青色となり内
層が露出したことが確認された。また、その時のキャリ
アの電気抵抗率は約lXl0’會(0cm)であった@
(発明の効果)
本発明の構成は上述の通りであり、内層および外層はキ
ャリアコアから剥離したり摩耗することが減少され、長
期間の複写によってキャリアの電気抵抗が低下すること
による画像濃度の上昇、文字潰れ、前ビキ等の画質劣化
等の不具合を減少することができる。また、内層と外層
の色を異ならせるとキャリアの寿命を目視にて判断する
ことができるから、上記した不具合を簡便な方法で未然
に回避することができる。This carrier and the toner obtained in Example 1 were mixed to give a toner concentration of 3.2% to obtain a developer. Regarding the obtained developer, images were produced using an electrophotographic copying machine DC-2585 (manufactured by Sanda Kogyo ■) in the same manner as in Example 1, and a copying test of 30,000 copies was conducted. As a result, it was confirmed that after running 30,000 sheets, the surface of the carrier turned blue and the inner layer was exposed. Also, the electrical resistivity of the carrier at that time was approximately lXl0'(0cm)@
(Effects of the Invention) The structure of the present invention is as described above, and the inner layer and the outer layer are less likely to peel off or wear out from the carrier core, and the image density is reduced due to the lower electrical resistance of the carrier during long-term copying. It is possible to reduce problems such as image quality deterioration such as rising, smeared characters, and blurred front lines. Furthermore, by making the inner layer and outer layer different in color, the lifespan of the carrier can be visually determined, so that the above-mentioned problems can be avoided in a simple manner.
4、 の な 日
箪1図(a)〜(C)は本発明の乾式2成分現像剤用キ
ャリアの摩耗状態を示す説明図、第2図はキャリアのコ
ピー枚数と、キャリアコアと樹脂層との比率Sf/Fe
との関係を表した図である。4. Nona Nittan 1 Figures (a) to (C) are explanatory diagrams showing the wear state of the carrier for dry two-component developer of the present invention, and Figure 2 shows the number of copies of the carrier and the relationship between the carrier core and the resin layer. The ratio Sf/Fe
FIG.
1・・・キャリアコア、2・・・内層、3・・・外層。1...Carrier core, 2...Inner layer, 3...Outer layer.
以上that's all
Claims (1)
た樹脂からなる内層と、該内層の外面に積層された樹脂
からなる外層と、を有する乾式2成分現像剤用キャリア
であって、該内層を形成する樹脂と該外層を形成する樹
脂は同種の樹脂にて形成され、且つ内層の硬度は外層の
硬度に比して高く設定されている乾式2成分現像剤用キ
ャリア。 2、キャリアの電気抵抗率が5.0×10^9〜5.0
×10^1^1(Ωcm)にあり、前記キャリアコアに
前記内層のみが積層された状態の電気抵抗率は該キャリ
アの電気抵抗率の0.2〜0.5倍である請求項1記載
の乾式2成分現像剤用キャリア。 3、前記内層と前記外層が異色の樹脂にて形成されてい
る請求項1又は2記載の乾式2成分現像剤用キャリア。[Claims] 1. A carrier for a dry two-component developer that has a carrier core, an inner layer made of resin laminated on the outer surface of the carrier core, and an outer layer made of resin laminated on the outer surface of the inner layer. A carrier for a dry two-component developer, wherein the resin forming the inner layer and the resin forming the outer layer are made of the same type of resin, and the hardness of the inner layer is set higher than the hardness of the outer layer. . 2. The electrical resistivity of the carrier is 5.0 x 10^9 ~ 5.0
×10^1^1 (Ωcm), and the electrical resistivity in a state where only the inner layer is laminated on the carrier core is 0.2 to 0.5 times the electrical resistivity of the carrier. Carrier for dry two-component developer. 3. The carrier for a dry two-component developer according to claim 1 or 2, wherein the inner layer and the outer layer are formed of resins of different colors.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2063410A JPH03263052A (en) | 1990-03-13 | 1990-03-13 | Carrier for two-component developer for dry processing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2063410A JPH03263052A (en) | 1990-03-13 | 1990-03-13 | Carrier for two-component developer for dry processing |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03263052A true JPH03263052A (en) | 1991-11-22 |
Family
ID=13228498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2063410A Pending JPH03263052A (en) | 1990-03-13 | 1990-03-13 | Carrier for two-component developer for dry processing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03263052A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000310880A (en) * | 1999-04-27 | 2000-11-07 | Mitsubishi Chemicals Corp | Color electrophotographic developer |
JP2008281860A (en) * | 2007-05-11 | 2008-11-20 | Kao Corp | Two-component developer |
JP2015132681A (en) * | 2014-01-10 | 2015-07-23 | 京セラドキュメントソリューションズ株式会社 | Two-component developer, and manufacturing method of two-component developer |
-
1990
- 1990-03-13 JP JP2063410A patent/JPH03263052A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000310880A (en) * | 1999-04-27 | 2000-11-07 | Mitsubishi Chemicals Corp | Color electrophotographic developer |
JP2008281860A (en) * | 2007-05-11 | 2008-11-20 | Kao Corp | Two-component developer |
JP2015132681A (en) * | 2014-01-10 | 2015-07-23 | 京セラドキュメントソリューションズ株式会社 | Two-component developer, and manufacturing method of two-component developer |
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