JPH02130560A - Color toner for electrostatic charge image - Google Patents

Color toner for electrostatic charge image

Info

Publication number
JPH02130560A
JPH02130560A JP63283771A JP28377188A JPH02130560A JP H02130560 A JPH02130560 A JP H02130560A JP 63283771 A JP63283771 A JP 63283771A JP 28377188 A JP28377188 A JP 28377188A JP H02130560 A JPH02130560 A JP H02130560A
Authority
JP
Japan
Prior art keywords
toner
charge
metal oxide
conductive metal
color toner
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
Application number
JP63283771A
Other languages
Japanese (ja)
Inventor
Tsugugo Fujie
藤江 嗣五
Hidemitsu Kuwabara
桑原 秀光
Akihiro Sano
昭洋 佐野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tomoegawa Co Ltd
Original Assignee
Tomoegawa Paper Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tomoegawa Paper Co Ltd filed Critical Tomoegawa Paper Co Ltd
Priority to JP63283771A priority Critical patent/JPH02130560A/en
Publication of JPH02130560A publication Critical patent/JPH02130560A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00Developers
    • G03G9/08Developers with toner particles
    • G03G9/097Plasticisers; Charge controlling agents
    • G03G9/09708Inorganic compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

PURPOSE:To prevent the degradation in the image density by an increase of the charge of a toner and carrier and to obtain stable images at the time of continuous copying of many sheets by incorporating a conductive metal oxide into the compounded compsn. of the color toner. CONSTITUTION:The color toner is provided by adding the conductive metal oxide having the following characteristics at 5 to 20% of the total weight of the toner to the compounded compsn. of the toner essentially consisting of a binder resin, coloring agent and charge control agent and by an ordinary hot kneading, grinding and classifying method. The conductive metal oxide which can be used in this case is fine powder which is transparent or white and has <=100OMEGA.cm volume resistivity value. Leak of charge arises hardly and the effect of the addition of the conductive metal oxide is not obtd. because of the high resistance if the volume resistivity value is larger than 100OMEGA.cm. The degradation in the image density is prevented while the increase of the charge of the toner and carrier is suppressed at the time of copying of many sheets. The copies which are free from a change in the image quality are thus obtd.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、電子写真法または静電記録法などに使用され
る静電荷像用トナーに関し、とくにカラートナーの組成
に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to toners for electrostatic images used in electrophotography or electrostatic recording methods, and particularly relates to the composition of color toners.

〔従来の技術〕[Conventional technology]

従来のカラートナーの組成は、結着樹脂、着色剤、電荷
制御剤等で構成されており、着色剤としてイエローはベ
ンジジンイエロー、マゼンタはキナクリドン、シアンは
銅フタロシアン等が使用されている。一方、黒トナーに
おいては導電性物質であるカーボンブラックを2〜10
%、着色剤及び電荷制御剤として使用している。該カー
ボンブラックは、乾式現像剤を用い多数枚コピーを行な
う場合において、トナーとキャリアに生じやすい過度の
電荷の上昇を、発生電荷の適当なリークによって防止す
る効果があり、トナーの電荷の上昇による画像濃度の低
下を防いでいる。
The composition of a conventional color toner is composed of a binder resin, a colorant, a charge control agent, etc., and the colorants used include benzidine yellow for yellow, quinacridone for magenta, and copper phthalocyanine for cyan. On the other hand, in black toner, carbon black, which is a conductive substance, is added at 2 to 10
%, used as a colorant and charge control agent. This carbon black has the effect of preventing an excessive increase in charge that tends to occur in the toner and carrier when making multiple copies using a dry developer by appropriately leaking the generated charge. This prevents a decrease in image density.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかしながら前記、カラートナー特にトナー層の透明性
を要求されるフルカラートナーにおいては、当然の事な
がらカーボンブラックはそれ自体が黒色であるため使用
出来ない。したがって、導電性物質を含有しないカラー
トナーの場合は多数枚コピー時におけるトナーとキャリ
アの電荷の上昇と、それによる画像濃度の低下が問題と
なっている。なお、この場合の対策として、イオン性導
電性物質の添加されたカラートナーが提案されているが
、該カラートナーは湿度依存性が大きく、広い湿度条件
下で画質変化の無いコピーを要求される静電荷像用カラ
ートナーとしては実用上問題を有する。
However, in the above-mentioned color toner, particularly in the full-color toner which requires transparency of the toner layer, carbon black cannot be used because carbon black itself is black. Therefore, in the case of color toners that do not contain conductive substances, there is a problem of an increase in the electric charge of the toner and carrier during copying of a large number of sheets, and a resulting decrease in image density. As a countermeasure in this case, a color toner to which an ionic conductive substance is added has been proposed, but this color toner is highly dependent on humidity and requires copying without change in image quality under a wide range of humidity conditions. This has a practical problem as a color toner for electrostatic images.

本発明の目的は前述の従来の問題を解決することにあり
、多数枚コピー時におけるトナーとキャリアの電荷の上
昇をおさえ、それによる画像濃度の低下を防止し、広い
温度条件下で画質変化の無いコピーを得ることができる
カラートナーを提供することにある。
The purpose of the present invention is to solve the above-mentioned conventional problems, and to suppress the increase in charge of toner and carrier when copying a large number of copies, to prevent the resulting decrease in image density, and to prevent changes in image quality under wide temperature conditions. Our goal is to provide color toners that you can get without copying.

〔課題を解決するための手段〕[Means to solve the problem]

すなわち、本発明は、静電荷像を現像する際に用いられ
るトナーに関するもので体積固有抵抗が100Ω・cm
以下である透明または白色の導電性金属酸化物を、全ト
ナー重量に対し5〜20%含有することを特徴とする静
電荷像用カラートナーに関する。
That is, the present invention relates to a toner used when developing an electrostatic charge image, and has a volume resistivity of 100 Ω·cm.
The present invention relates to a color toner for electrostatic images, characterized in that it contains the following transparent or white conductive metal oxide in an amount of 5 to 20% based on the total toner weight.

以下、本発明について更に説明する。The present invention will be further explained below.

本発明にかかるカラートナーは、結着樹脂、着色剤、電
荷制御剤を主成分とするトナーの配合組成に以下の物性
を持つ導電性金属酸化物を全トナー重量に対し5〜20
%加え、通常の熱混練粉砕分級法により製造される。本
発明で使用できる導電性金属酸化物としては、目透明ま
たは白色であり、2)−次粒子径が2μm以下であり、
3)体積固有抵抗値が100Ω・C以下である微粉末で
ある。体積固有抵抗値が100Ω・cmより大きいと高
抵抗なため電荷のリークが起こりにくく導電性金属酸化
物添加の効果が出ない。
The color toner according to the present invention contains a conductive metal oxide having the following physical properties in the composition of the toner whose main components are a binder resin, a colorant, and a charge control agent in an amount of 5 to 20% based on the total toner weight.
% and is manufactured by the usual heat-kneading-pulverization-classification method. The conductive metal oxide that can be used in the present invention is transparent or white in color, 2) has a secondary particle size of 2 μm or less, and
3) It is a fine powder with a volume resistivity value of 100Ω·C or less. When the volume resistivity value is larger than 100 Ω·cm, the resistance is high, so that charge leakage is difficult to occur and the effect of adding the conductive metal oxide is not obtained.

上記条件を満たす導電性金属酸化物の例としては、チタ
ン工業社製のECTT−1(商品名)が挙げられ、その
特性は下記に示す通りである。
An example of a conductive metal oxide that satisfies the above conditions is ECTT-1 (trade name) manufactured by Titan Kogyo Co., Ltd., and its characteristics are as shown below.

色:淡青白色粉末、 固有抵抗:10〜30Ω・口、 比表面積:50〜10m/g、 粒子径: 0.22〜0.3μm、 成分:Ti、 Sn、 Sb複合金属酸化物、組成: 
Ti0z−5n(Sb)Oz、その他として、チタン工
業社のECT−62(表面コートTiO□)、触媒化成
社のELCOMTL−10(酸化錫)、住友セメント社
のADSO(Sbl−5nOt)、I T O(SnI
vInz03)等の商品名(Mi成)で示される化合物
が本発明でいう導電性金属酸化物として適用される。
Color: pale blue-white powder, specific resistance: 10-30 Ω, specific surface area: 50-10 m/g, particle size: 0.22-0.3 μm, component: Ti, Sn, Sb composite metal oxide, composition:
TiOz-5n(Sb)Oz, others include Titanium Kogyo Co., Ltd.'s ECT-62 (surface coated TiO□), Catalysts & Chemicals Co., Ltd.'s ELCOMTL-10 (tin oxide), Sumitomo Cement Co., Ltd.'s ADSO (Sbl-5nOt), I T O(SnI
Compounds represented by trade names (Mi) such as vInz03) are used as the conductive metal oxide in the present invention.

導電性金属酸化物の添加量は5%以下だと電荷のリーク
効果がほとんど期待できず、20%以上だと電荷リーク
効果が大きくなり過ぎトナーの電荷が小さくなりトナー
飛散などの問題が生しる。
If the amount of conductive metal oxide added is less than 5%, hardly any charge leakage effect can be expected, and if it is more than 20%, the charge leakage effect becomes too large and the charge of the toner decreases, causing problems such as toner scattering. Ru.

本発明に使用される結着樹脂は、一般にトナー用結着剤
として使用されるものは全て使用可能であるが、例えば
スチレン樹脂、ポリアクリル酸エステル樹脂、スチレン
−アクリル酸エステル共重合体樹脂、ポリ塩化ビニル、
ポリ酢酸ビニル、ポリ塩化ビニリデン、フェノール樹脂
、エポキシ樹脂、ポリエステル樹脂などが挙げられる。
The binder resin used in the present invention can be any binder generally used as a binder for toner, such as styrene resin, polyacrylate resin, styrene-acrylate copolymer resin, PVC,
Examples include polyvinyl acetate, polyvinylidene chloride, phenol resin, epoxy resin, and polyester resin.

又、着色剤もカラー用トナーに使用されるものは全て使
用可能であるが、例えばモノアゾ系赤色仰料(パーマネ
ントレッド4Rなど)、ジスアゾ系黄色顔料、キナクリ
ドン系マゼンタ顔料、アントラキノン染料などが挙げら
れる。
Furthermore, all colorants used in color toners can be used, and examples include monoazo red pigments (such as Permanent Red 4R), disazo yellow pigments, quinacridone magenta pigments, and anthraquinone dyes. .

電荷制御剤としては、4級アンモニウム塩、Ca。As the charge control agent, quaternary ammonium salt, Ca.

Baなどのチタネートあるいはカーボネート、アルコキ
シル化アミン、ナイロン等各種ポリアミド系樹脂、アミ
ノ基を含有する線系ポリマー等のポリアミン樹脂などが
挙げられる。
Examples include titanates or carbonates such as Ba, alkoxylated amines, various polyamide resins such as nylon, and polyamine resins such as linear polymers containing amino groups.

なお、本発明の静電荷像用カラートナーには、上記の材
料組成以外に必要に応じて他の添加物を配合することが
できる。すなわち、潤滑剤、研磨剤、定着助剤などの例
えば、ポリテトラフルオロエチレン粉、高級脂肪酸の金
属塩、酸化セリウム、低分子量ポリエチレン、低分子量
ポリプロピレンなどを配合することができる。
In addition to the above-mentioned material composition, other additives may be added to the color toner for electrostatic images of the present invention as required. That is, lubricants, abrasives, fixing aids, etc., such as polytetrafluoroethylene powder, metal salts of higher fatty acids, cerium oxide, low molecular weight polyethylene, and low molecular weight polypropylene, can be blended.

〔実施例〕〔Example〕

次に実施例により本発明を説明する。なお、ここで配合
を表す部数はすべて重量部である。
Next, the present invention will be explained with reference to Examples. It should be noted that all parts expressed herein are parts by weight.

実施例1 エポキシ樹脂R304Kを50部、R307Kを50部
(共に三井石油化学社製)、電荷制御剤のPT−38(
住人化学社製)を2部、キナクリドン顔料を4部、導電
性Ti0z微粉末(チタン工業社製ECTT−1)を7
.5部の割合で混合し、熱混練粉砕分級という通常のト
ナー化工程を経てマゼンタ色の未外添カラートナーを得
た。該未外添カラートナー100部に疎水性シリカ微粉
末R972(日本アエロジル社製)を0.3部外添しカ
ラートナーとした。該カラートナー6.5部とポリフッ
化ビニリデンコート鉄粉100部(関東電化社製150
〜350メツシユ)を充分混合し現像剤とした。
Example 1 50 parts of epoxy resin R304K, 50 parts of R307K (both manufactured by Mitsui Petrochemicals), and charge control agent PT-38 (
2 parts of quinacridone pigment (manufactured by Sumima Kagaku Co., Ltd.), 4 parts of quinacridone pigment, and 7 parts of conductive Ti0z fine powder (ECTT-1, manufactured by Titan Kogyo Co., Ltd.).
.. A magenta color toner with no external additives was obtained by mixing in a ratio of 5 parts and going through a normal toner production process of heat kneading, pulverization and classification. A color toner was prepared by adding 0.3 parts of hydrophobic silica fine powder R972 (manufactured by Nippon Aerosil Co., Ltd.) to 100 parts of the color toner without any external additives. 6.5 parts of the color toner and 100 parts of polyvinylidene fluoride coated iron powder (150 parts manufactured by Kanto Denka Co., Ltd.)
~350 meshes) were thoroughly mixed to prepare a developer.

上記現像剤とトナーを用い感光体にopcを使用してい
る複写機(シャープ社製SF −8200)で多数枚コ
ピーテストを実施したところ、第1表に示すように帯電
量および画像濃度はともに安定していた。
When a multi-sheet copying test was conducted using the above developer and toner with a copying machine (Sharp Corporation SF-8200) using an OPC photoreceptor, both the charge amount and image density were as shown in Table 1. It was stable.

第1表 (注)第1表中の帯電量(Q/M)はブローオフ法によ
り測定し単位は(μc/g)である。画像濃度(1,0
,)はマクベス反射濃度計で測定した。
Table 1 (Note) The amount of charge (Q/M) in Table 1 was measured by the blow-off method, and the unit is (μc/g). Image density (1,0
) were measured using a Macbeth reflection densitometer.

化および評価を行なった。その結果、第3表に示すよう
に帯電量は安定し、画像濃度の低下は見られなかった。
The results were analyzed and evaluated. As a result, as shown in Table 3, the amount of charge was stable and no decrease in image density was observed.

第3表 (注)第3表中の帯電量(Q/M)はブローオフ法によ
り測定し単位は(μc/g)である。画像濃度(1,D
、)はマクベス反射濃度計で測定した。
Table 3 (Note) The amount of charge (Q/M) in Table 3 was measured by the blow-off method, and the unit is (μc/g). Image density (1, D
) were measured with a Macbeth reflection densitometer.

〔発明の効果〕〔Effect of the invention〕

本発明の静電荷像用カラートナーは、以上のようにカラ
ートナーの配合組成に導電性金属酸化物を含有させるこ
とにより、多数枚の連続コピー時におけるトナーとキャ
リアの電荷の上昇による画像濃度の低下を防止し、安定
した画像を提供することができる。
As described above, the color toner for electrostatic images of the present invention contains a conductive metal oxide in the composition of the color toner, thereby reducing the image density due to the increase in charge of the toner and carrier during continuous copying of a large number of sheets. It is possible to prevent deterioration and provide stable images.

比較例1 実施例1の配合から導電性TiO□微粉末を添加しない
こと以外は、実施例1と同様にしてトナー化および評価
を行なった。その結果、第2表に示すように帯電量は上
昇し、画像濃度は急激に低下した。
Comparative Example 1 A toner was prepared and evaluated in the same manner as in Example 1, except that the conductive TiO□ fine powder was not added to the formulation in Example 1. As a result, as shown in Table 2, the amount of charge increased and the image density sharply decreased.

第2表 (注)第2表中の帯電量(Q/M)はブローオフ法によ
り測定し単位は(μc/g)である。画像濃度(1,D
、)はマクベス反射濃度計で測定した。
Table 2 (Note) The amount of charge (Q/M) in Table 2 is measured by the blow-off method, and the unit is (μc/g). Image density (1, D
) were measured with a Macbeth reflection densitometer.

実施例2Example 2

Claims (1)

【特許請求の範囲】[Claims] 体積固有抵抗が100Ω・cm以下である透明または白
色の導電性金属酸化物を、全トナー重量に対し5〜20
%含有することを特徴とする静電荷像用カラートナー。
A transparent or white conductive metal oxide with a volume resistivity of 100 Ω・cm or less is added in an amount of 5 to 20% based on the total toner weight.
A color toner for electrostatic images characterized by containing %.
JP63283771A 1988-11-11 1988-11-11 Color toner for electrostatic charge image Pending JPH02130560A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63283771A JPH02130560A (en) 1988-11-11 1988-11-11 Color toner for electrostatic charge image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63283771A JPH02130560A (en) 1988-11-11 1988-11-11 Color toner for electrostatic charge image

Publications (1)

Publication Number Publication Date
JPH02130560A true JPH02130560A (en) 1990-05-18

Family

ID=17669907

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63283771A Pending JPH02130560A (en) 1988-11-11 1988-11-11 Color toner for electrostatic charge image

Country Status (1)

Country Link
JP (1) JPH02130560A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59168460A (en) * 1983-03-15 1984-09-22 Canon Inc Electrophotographic developer
JPS59170849A (en) * 1983-03-17 1984-09-27 Canon Inc Magnetic color developer
JPS60114866A (en) * 1983-11-26 1985-06-21 Toshiba Corp Toner for electrophotographic development
JPH01200367A (en) * 1988-02-05 1989-08-11 Sharp Corp Developer
JPH0279053A (en) * 1988-09-16 1990-03-19 Konica Corp Electrophotographic color toner
JPH02126266A (en) * 1988-11-07 1990-05-15 Canon Inc Toner for developing electrostatic charge image

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59168460A (en) * 1983-03-15 1984-09-22 Canon Inc Electrophotographic developer
JPS59170849A (en) * 1983-03-17 1984-09-27 Canon Inc Magnetic color developer
JPS60114866A (en) * 1983-11-26 1985-06-21 Toshiba Corp Toner for electrophotographic development
JPH01200367A (en) * 1988-02-05 1989-08-11 Sharp Corp Developer
JPH0279053A (en) * 1988-09-16 1990-03-19 Konica Corp Electrophotographic color toner
JPH02126266A (en) * 1988-11-07 1990-05-15 Canon Inc Toner for developing electrostatic charge image

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