JP2001221225A - Semiconductive silicone rubber roll - Google Patents
Semiconductive silicone rubber rollInfo
- Publication number
- JP2001221225A JP2001221225A JP2000032658A JP2000032658A JP2001221225A JP 2001221225 A JP2001221225 A JP 2001221225A JP 2000032658 A JP2000032658 A JP 2000032658A JP 2000032658 A JP2000032658 A JP 2000032658A JP 2001221225 A JP2001221225 A JP 2001221225A
- Authority
- JP
- Japan
- Prior art keywords
- silicone rubber
- carbon
- semiconductive
- semiconductive silicone
- parts
- 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.)
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- Compositions Of Macromolecular Compounds (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、半導電性ロールに
関し、特に電子写真複写機、プリンター等の画像形成装
置の一部材である転写ロール、帯電ロール等に好適に使
用される半導電性シリコーンゴムロールに関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductive roll, and more particularly to a semiconductive silicone suitably used for a transfer roll, a charging roll and the like which are members of an image forming apparatus such as an electrophotographic copying machine and a printer. It relates to a rubber roll.
【０００２】[0002]
【従来の技術】従来、上記画像形成装置内で使用される
半導電性ロールとしては、導電性芯材の外周面に主に発
泡ゴムからなる半導電性弾性層を形成したロールが使用
されているが、この半導電性弾性層は環境特性に優れた
半導電性シリコーンゴム組成物を材料として形成される
ことが多い。2. Description of the Related Art Conventionally, as a semiconductive roll used in the above image forming apparatus, a roll having a semiconductive elastic layer mainly composed of foamed rubber formed on the outer peripheral surface of a conductive core material has been used. However, the semiconductive elastic layer is often formed using a semiconductive silicone rubber composition having excellent environmental characteristics as a material.
【０００３】そして、前記の半導電性シリコーンゴム組
成物としては、一般的には、絶縁性であるシリコーンゴ
ムに導電性カーボンブラックを添加することにより導電
性を付与するもので、例えば特開昭５４−１３９６５９
号公報にはファーネスブラックとアセチレンブラックを
併用した導電性オルガノポリシロキサンエラストマーが
記載されている。[0003] The semiconductive silicone rubber composition is generally one which imparts conductivity by adding conductive carbon black to an insulating silicone rubber. 54-139659
Japanese Patent Application Laid-Open Publication No. HEI 9-175139 discloses a conductive organopolysiloxane elastomer using a combination of furnace black and acetylene black.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記の
ようなカーボンブラックを配合分散させた半導電性シリ
コーンゴム組成物は、半導電領域においてカーボンブラ
ック配合量の変化に基づき抵抗値が著しく変動し易く、
抵抗値の安定性や再現性に欠ける問題を有していた。す
なわち、導電性を付与するためにＦＥＦ，ＧＰＦ等のフ
ァーネスブラック、アセチレンブラック、ケッチェンブ
ラック等のカーボンブラックを添加したゴム組成物の場
合に、添加量のごく僅かの変化によって抵抗値が大きく
ばらつき、電気抵抗の制御が非常に困難になる問題であ
る。However, in the semiconductive silicone rubber composition in which carbon black is mixed and dispersed as described above, the resistance value is liable to fluctuate significantly in the semiconductive region due to the change in the amount of carbon black mixed. ,
There was a problem that stability and reproducibility of the resistance value were lacking. That is, in the case of a rubber composition to which carbon black such as furnace black, acetylene black, and Ketjen black such as FEF and GPF is added to impart conductivity, the resistance value greatly varies due to a slight change in the addition amount. In addition, it is very difficult to control the electric resistance.
【０００５】また、上記と同様のカーボンブラックを添
加したシリコーンゴム組成物を一定の高電圧で継続的に
印加した場合、印加時間中に抵抗値が大きく低下する経
時的変化の問題も発生していた。Further, when a silicone rubber composition containing the same carbon black as described above is continuously applied at a constant high voltage, there is also a problem of a change with time in which the resistance value is greatly reduced during the application time. Was.
【０００６】上記のように、複数の要因により抵抗値の
変動が著しい半導電性シリコーンゴム組成物を用いて導
電性弾性層を形成した例えば転写ロールの場合には、必
要とされる転写電流を制御するためより精密な印加電圧
制御装置を必要とし装置の複雑化やコスト上昇を招く問
題がある。また、抵抗値の変動問題とは別に、導電性カ
ーボンブラックは、ゴム硬度の上昇および作業性や加工
性の悪化を避けるため、比較的少量しか添加できない制
約があり、カーボン量の調整により製品の用途に応じた
抵抗値を広範囲において任意に設定できない不都合があ
った。As described above, in the case of, for example, a transfer roll in which a conductive elastic layer is formed using a semiconductive silicone rubber composition whose resistance value varies significantly due to a plurality of factors, the required transfer current is reduced. There is a problem that a more precise applied voltage control device is required for control, and the device becomes complicated and cost increases. In addition to the problem of resistance value fluctuation, conductive carbon black has a restriction that only a relatively small amount can be added to avoid increase in rubber hardness and deterioration of workability and workability. There is a disadvantage that the resistance value according to the application cannot be arbitrarily set in a wide range.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
本発明者らは、鋭意研究を重ねた結果、従来専ら低硬度
ゴム用の補強剤や充填剤として用いられ、導電性を付与
するカーボンブラックとしては全く考えられていなかっ
たある製法により得られるソフトカーボンが、意外にも
シリコーンゴムに対しては成形性に悪影響を与えること
なく好適な範囲で導電性を付与でき、しかもこれを配合
したシリコーンゴム組成物は、カーボン配合量をはじめ
として諸要素の変化に対する依存性が小さく抵抗値が種
々の局面において安定しており、このシリコーンゴム組
成物をロールの導電性弾性層の材料に用いることで前述
の問題を解消できることを知見し本発明を完成するに至
ったものである。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, carbon fibers which have been conventionally used exclusively as reinforcing agents or fillers for low-hardness rubbers and which impart conductivity are provided. Soft carbon obtained by a certain manufacturing method that was never considered as black can surprisingly impart conductivity to silicone rubber in a suitable range without adversely affecting moldability, and it was blended with silicone rubber. The silicone rubber composition has a small dependence on changes in various factors including the carbon content, and has a stable resistance value in various aspects. Use this silicone rubber composition for the material of the conductive elastic layer of the roll. The inventors have found that the above-mentioned problems can be solved, and have completed the present invention.
【０００８】すなわち、本発明は、導電性芯材の外周面
に半導電性シリコーンゴム層を被覆した半導電性シリコ
ーンゴムロールにおいて、前記半導電性シリコーンゴム
層が、天然ガスの熱分解により得られるカーボンブラッ
クであって、窒素吸着比表面積が９．０〜９．５ｍ2／
ｇ、ＤＢＰ吸油量が３４〜４０ｃｍ3／１００ｇ、平均
粒子径が２４０〜３２０ｎｍのＭＴカーボンを含む半導
電性シリコーンゴム組成物により形成されている半導電
性シリコーンゴムロールを課題解決の手段とするもので
ある。That is, the present invention provides a semiconductive silicone rubber roll in which a semiconductive silicone rubber layer is coated on the outer peripheral surface of a conductive core material, wherein the semiconductive silicone rubber layer is obtained by thermal decomposition of natural gas. A carbon black having a nitrogen adsorption specific surface area of 9.0 to 9.5 m 2 /
g, which DBP oil absorption is a means 34~40cm 3 / 100g, a semiconductive silicone rubber roll having an average particle diameter is formed by a semi-conductive silicone rubber composition comprising an MT carbon 240~320nm solving problems It is.
【０００９】本発明のロール材料として用いる半導電性
シリコーンゴム組成物は、基本的には常温または加熱等
によって硬化させることによりゴム弾性体となるポリオ
ルガノシロキサン組成物に、少なくとも前記条件を満足
するＭＴカーボンを添加したもので、必要に応じて各種
添加剤等を配合することができるものである。このよう
な半導電性組成物は、押し出し成形等種々の成形方法で
円筒状に形成され、導電性芯材の外周面に被覆・接着さ
れて半導電性シリコーンゴム層を形成することになる。The semiconductive silicone rubber composition used as the roll material of the present invention basically satisfies at least the above-mentioned conditions with a polyorganosiloxane composition which becomes a rubber elastic body by being cured at room temperature or by heating. It is a material to which MT carbon is added, and various additives and the like can be blended as needed. Such a semiconductive composition is formed into a cylindrical shape by various molding methods such as extrusion molding, and is coated and adhered to the outer peripheral surface of the conductive core material to form a semiconductive silicone rubber layer.
【００１０】本発明に用いられる半導電性シリコーンゴ
ム組成物に添加されるＭＴカーボンは、サーマル（熱分
解）法、すなわち燃料を燃焼させて熱分解温度以上に加
熱した炉内に天然ガスを導入し、天然ガスの熱分解によ
りカーボンブラックを生産したもので、他のオイルファ
ーネス法によるファーネスブラック等に比較して、大粒
径で低ストラクチャーの比表面積が非常に小さいカーボ
ンブラックであり、完全燃焼法のため不純物が少ない特
長を有し、その窒素吸着比表面積は９．０〜９．５ｍ2
／ｇ、ＤＢＰ吸油量は３４〜４０ｃｍ3／１００ｇ、平
均粒子径は２４０〜３２０ｎｍの範囲にあることが必要
である。このＭＴカーボンは、大粒径で低ストラクチャ
ーのカーボンブラックが導電性付与剤としては不適であ
るとの通念に反して、シリコーンゴムに対しては適度の
導電性を付与できる。その理由として、シリコーンゴム
が他のゴムに比べて格段に柔軟であることに起因して、
ゴム中に分散されたＭＴカーボン粒子の接触の程度が高
まるためと推測される。このＭＴカーボンとしては、Ｎ
９９１（キャンカーブ社製）、Ｎ９０８−ＵＰ（キャン
カーブ社製）、ＬＰＴ（キャンカーブ社製）、アロスパ
ース（エンジニアドカーボン社製）などが挙げられる。The MT carbon added to the semiconductive silicone rubber composition used in the present invention is obtained by introducing a natural gas into a furnace heated to a temperature equal to or higher than the thermal decomposition temperature by burning a fuel. Carbon black is produced by pyrolysis of natural gas.Compared with other furnace black produced by the oil furnace method, it is a carbon black with a large particle size and low structure and a very small specific surface area. The method has the characteristic of containing few impurities due to the method, and its nitrogen adsorption specific surface area is 9.0 to 9.5 m 2.
/ G, DBP oil absorption 34~40cm 3 / 100g, average particle size is required to be in the range of 240～320Nm. Contrary to the belief that carbon black having a large particle diameter and a low structure is not suitable as a conductivity-imparting agent, this MT carbon can impart an appropriate conductivity to silicone rubber. The reason is that silicone rubber is much more flexible than other rubbers,
It is assumed that the degree of contact of the MT carbon particles dispersed in the rubber was increased. As this MT carbon, N
991 (manufactured by Can Curve), N908-UP (manufactured by Can Curve), LPT (manufactured by Can Curve), Allsparse (manufactured by Engineered Carbon) and the like.
【００１１】本発明のロール材料として使用する半導電
性シリコーンゴム組成物の主成分であるポリオルガノシ
ロキサンベースポリマーとしては、ジメチル系シロキサ
ン、フェニル系シロキサン等のミラブル型と称されるも
のが好適であり、これらのシリコーン生ゴムを１種また
は２種以上組み合わせたものが使用できる。このポリオ
ルガノシロキサンポリマーには、前記ＭＴカーボンが必
須成分として添加されるほか、任意成分として、有機過
酸化物加硫剤や付加型架橋剤等の硬化剤、シリカ系補強
充填剤、アゾジカルボンアミド系やアゾイソブチロニト
リル系等の発泡剤、その他耐熱用酸化防止剤、加工性改
善助剤等の各種添加剤を必要に応じて配合し均一に分散
される。As the polyorganosiloxane base polymer, which is the main component of the semiconductive silicone rubber composition used as the roll material of the present invention, dimethyl-based siloxane, phenyl-based siloxane and the like, which are called millable type, are suitable. Yes, one or a combination of two or more of these silicone raw rubbers can be used. To the polyorganosiloxane polymer, the MT carbon is added as an essential component, and as optional components, a curing agent such as an organic peroxide vulcanizing agent or an addition type crosslinking agent, a silica-based reinforcing filler, an azodicarbonamide Various additives such as a foaming agent such as a heat-resistant or azoisobutyronitrile-based foaming agent, an antioxidant for heat resistance, and an aid for improving processability are blended as necessary and uniformly dispersed.
【００１２】本発明のロール材料として使用する半導電
性シリコーンゴム組成物は、カーボン添加量の変動に対
して抵抗値の変動が緩慢であり、例えば１０12Ωから１
０4Ωまで抵抗値を変動させるには、ＭＴカーボンの２
５重量部程度の増量を必要している。このことから、カ
ーボンブラック添加量の変動による抵抗値が急激に変化
する半導電領域において、混練時のロスにより生じるカ
ーボンブラック含有量の僅かの差異や押出成形等の成形
加工時に生じるその分散度の微妙な相違がたとえ生じた
としても、抵抗値の変動にはほとんど影響を与えること
がない。その結果、半導電領域での抵抗値の再現性が高
く、量産安定性に優れたシリコーンゴム組成物として転
写ロール等の半導電性弾性層に使用できる。また、一定
の高電圧を長時間印加した際にも印加時間中、抵抗値が
ほぼ安定しているという利点を有する。The semiconductive silicone rubber composition used as the roll material of the present invention has a slow change in resistance with respect to a change in the amount of carbon added, for example, from 10 12 Ω to 1 Ω.
0 up to 4 Omega varying the resistance value of MT carbon 2
An increase of about 5 parts by weight is required. From this, in the semiconductive region where the resistance value changes rapidly due to the change in the amount of carbon black added, a slight difference in the carbon black content caused by a loss during kneading and the degree of dispersion of the carbon black caused during molding such as extrusion molding. Even if a slight difference occurs, it hardly affects the fluctuation of the resistance value. As a result, the silicone rubber composition having high reproducibility of the resistance value in the semiconductive region and excellent mass production stability can be used for the semiconductive elastic layer such as a transfer roll. In addition, even when a constant high voltage is applied for a long time, there is an advantage that the resistance value is almost stable during the application time.
【００１３】本発明のロール材料として使用する半導電
性シリコーンゴム組成物は、ＭＴカーボンの多量配合が
可能でかつ作業性や加工性を悪化させることがないとい
う特性を生かせるので、その配合量を調整することによ
り、付与する導電性の程度を広い範囲から任意に選択で
きる。このＭＴカーボンの配合量は、特に限定されない
が、用途に応じてシリコーンゴム１００重量部に対して
３０〜１００重量部の範囲で選択するのが好ましい。な
お、本発明で用いる半導電性シリコーンゴム組成物は、
イオン導電性タイプのゴム組成物でなく導電オイルや可
塑剤を含ませることなく、ＭＴカーボンを単独で添加し
て導電性を付与することができるので、シリコーンゴム
が本来有する優れた環境特性を阻害せず、温度や湿度等
の環境変化に対して影響されず安定した抵抗値を保持す
ることができる。The semiconductive silicone rubber composition used as the roll material of the present invention makes use of the characteristics that a large amount of MT carbon can be blended and that the workability and processability are not deteriorated. By adjusting, the degree of conductivity to be provided can be arbitrarily selected from a wide range. The blending amount of the MT carbon is not particularly limited, but is preferably selected in the range of 30 to 100 parts by weight based on 100 parts by weight of the silicone rubber depending on the application. Incidentally, the semiconductive silicone rubber composition used in the present invention,
It is not an ion-conductive type rubber composition, but can be made conductive by adding MT carbon alone without containing conductive oil or plasticizer, thereby inhibiting the excellent environmental properties inherent in silicone rubber. Therefore, a stable resistance value can be maintained without being affected by environmental changes such as temperature and humidity.
【００１４】なお、窒素吸着比表面積、ＤＢＰ吸油量お
よび平均粒子径のいずれかの値が前記範囲外のカーボン
ブラックや天然ガスの熱分解以外の製法により得られる
カーボンブラックは、前述した中抵抗領域における安定
した抵抗値を得ることができず、多量配合時での良好な
作業性を付与することができない。It should be noted that carbon black having a nitrogen adsorption specific surface area, DBP oil absorption and average particle diameter out of the above-mentioned ranges and carbon black obtained by a production method other than the thermal decomposition of natural gas have the above-mentioned medium resistance region. , A stable resistance value cannot be obtained, and good workability cannot be imparted when a large amount is blended.
【００１５】[0015]
【実施例】以下、本発明のロール材料として使用する半
導電性シリコーンゴム組成物の実施例について比較例と
ともに説明する。 ［カーボン配合量と抵抗値］ （実施例１）シリコーン生ゴムとしてＴＳＥ２６０−３
Ｕ（東芝シリコーン株式会社製、商品名）５０重量部
（以下単に「部」と略する）およびＴＳＥ２６０−５Ｕ
（東芝シリコーン株式会社製、商品名）５０部に、有機
過酸化物架橋剤としてＴＣ−４（東芝シリコーン株式会
社製、商品名）３部を加え、ＭＴカーボンとして窒素吸
着比表面積９．０ｍ2／ｇ、ＤＢＰ吸油量３４ｃｍ3／１
００ｇ、平均粒子径２７０ｎｍであるＮ９９１（キャン
カーブ社製、商品名）を６５部加え、８インチオープン
ロールで混練を行い十分混合分散させて得られた半導電
性組成物を、プレス加硫機に投入して１７０℃で１５分
間の１次加硫を行い、その後２００℃で２時間の２次加
硫を行ってシート状（縦１２ｃｍ×横１３ｃｍ×厚さ３
ｍｍ）のサンプルを得た。次いで、図１に示すように、
このシート状サンプル１をその上方に配置した主電極２
およびガード電極３と下方に配置した対向電極４とで挟
持した状態で、常温常湿下、電圧５００Ｖ印加時の電流
値を電流計Ａにより測定すると共に、オームの法則によ
りサンプル１の抵抗値Ωを求めた。同様に、上記Ｎ９９
１の配合量をそれぞれ７０部、７５部、８０部に変更し
て得られる抵抗値の結果を表１および図２に示した。EXAMPLES Examples of the semiconductive silicone rubber composition used as the roll material of the present invention will be described below along with comparative examples. [Carbon blending amount and resistance value] (Example 1) TSE260-3 as silicone raw rubber
U (manufactured by Toshiba Silicone Co., Ltd., trade name) 50 parts by weight (hereinafter simply referred to as “parts”) and TSE260-5U
To 50 parts (trade name, manufactured by Toshiba Silicone Co., Ltd.), 3 parts of TC-4 (trade name, manufactured by Toshiba Silicone Co., Ltd.) was added as an organic peroxide crosslinking agent, and a nitrogen adsorption specific surface area of 9.0 m 2 was used as MT carbon. / g, DBP oil absorption of 34cm 3/1
A semi-conductive composition obtained by adding 65 g of N991 (trade name, manufactured by Can Curve Co., Ltd.) having an average particle size of 270 nm, kneading with an 8-inch open roll, and sufficiently mixing and dispersing the mixture, is then press vulcanized. And subjected to primary vulcanization at 170 ° C. for 15 minutes, and then to secondary vulcanization at 200 ° C. for 2 hours to form a sheet (12 cm × 13 cm × thickness 3).
mm). Then, as shown in FIG.
The main electrode 2 on which the sheet sample 1 is disposed
In addition, while being sandwiched between the guard electrode 3 and the opposing electrode 4 disposed below, the current value when a voltage of 500 V is applied is measured by the ammeter A at normal temperature and normal humidity, and the resistance Ω of the sample 1 is measured according to Ohm's law. I asked. Similarly, the N99
Table 1 and FIG. 2 show the results of the resistance values obtained by changing the compounding amount of No. 1 to 70 parts, 75 parts, and 80 parts, respectively.
【００１６】（実施例２）実施例１におけるＭＴカーボ
ンを、窒素吸着比表面積９．５ｍ2／ｇ、ＤＢＰ吸油量
３７ｃｍ3／１００ｇ、平均粒子径２４０ｎｍであるＮ
９０８−ＵＰ（キャンカーブ社製、商品名）に替えた以
外は、実施例１と同様に各カーボン配合量についてサン
プルの作成および測定を行い、表１および図２に示す結
果を得た。[0016] (Example 2) the MT carbon of Embodiment 1, the nitrogen adsorption specific surface area 9.5 m 2 / g, DBP oil absorption of 37cm 3/100 g, average a particle size 240 nm N
A sample was prepared and measured for each carbon content in the same manner as in Example 1 except that 908-UP (trade name, manufactured by Cancarb Inc.) was used, and the results shown in Table 1 and FIG. 2 were obtained.
【００１７】（比較例１）本発明における半導電性シリ
コーンゴム組成物との比較のため、実施例１におけるカ
ーボンブラックを、窒素吸着比表面積２５４ｍ2／ｇ、
ＤＢＰ吸油量１７４ｃｍ3／１００ｇ、平均粒子径３０
ｎｍであるバルカンＸＣ−７２（キャボット社製、商品
名）に替えるとともに、その配合量をそれぞれ８部、１
０部、１２部、１４部とし、それ以外は実施例１と同様
に各カーボン配合量についてサンプルの作成および測定
を行い、表１および図３に示す結果を得た。(Comparative Example 1) For comparison with the semiconductive silicone rubber composition of the present invention, the carbon black of Example 1 was prepared by mixing the carbon black of Example 1 with a nitrogen adsorption specific surface area of 254 m 2 / g.
DBP oil absorption 174cm 3 / 100g, average particle size 30
Vulcan XC-72 (manufactured by Cabot Corporation, trade name), and the blending amount was 8 parts,
Samples were prepared and measured for each carbon blending amount in the same manner as in Example 1 except that the parts were 0 parts, 12 parts, and 14 parts, and the results shown in Table 1 and FIG. 3 were obtained.
【００１８】[0018]
【表１】 [Table 1]
【００１９】（比較例２）実施例１におけるカーボンブ
ラックを、オイルファーネス法による窒素吸着比表面積
２４ｍ2／ｇ、ＤＢＰ吸油量２８ｃｍ3／１００ｇ、平均
粒子径８０ｎｍであるアサヒサーマル（旭カーボン社
製、商品名）に替えるとともに、その配合量をそれぞれ
３０部、３５部、４０部、４５部、５０部とし、それ以
外は実施例１と同様に各カーボン配合量についてサンプ
ルの作成および測定を行い、表２および図４に示す結果
を得た。[0019] (Comparative Example 2) Carbon black in Example 1, the nitrogen adsorption specific by the oil furnace method surface area 24m 2 / g, DBP oil absorption of 28cm 3/100 g, Asahi Thermal an average particle size 80 nm (manufactured by Asahi Carbon Co. , And 30 parts, 35 parts, 40 parts, 45 parts, and 50 parts, respectively. Samples were prepared and measured for each carbon compounding amount in the same manner as in Example 1 except that the compounding amounts were 30, 35, 40, 45, and 50 parts. , Table 2 and FIG. 4 were obtained.
【００２０】[0020]
【表２】 [Table 2]
【００２１】（比較例３）実施例１におけるカーボンブ
ラックを、オイルファーネス法による窒素吸着比表面積
８．０ｍ2／ｇ、ＤＢＰ吸油量４１ｃｍ3／１００ｇ、平
均粒子径３５０ｎｍであるＳｅｖａｃａｒｂ ＭＴ−Ｃ
Ｉ（コロンビヤン・カーボン社製、商品名）に替えると
ともに、その配合量をそれぞれ４５部、５０部、５５
部、６０部とし、それ以外は実施例１と同様に各カーボ
ン配合量についてサンプルの作成および測定を行い、表
３および図５に示す結果を得た。[0021] (Comparative Example 3) Carbon black in Example 1, the nitrogen adsorption specific by the oil furnace method surface area 8.0 m 2 / g, DBP oil absorption of 41cm 3/100 g, an average particle diameter of 350nm Sevacarb MT-C
I (manufactured by Colombian Carbon Co., Ltd., trade name) and the compounding amount was 45 parts, 50 parts, 55 parts, respectively.
And 60 parts. Samples were prepared and measured for each carbon content in the same manner as in Example 1 except for the above, and the results shown in Table 3 and FIG. 5 were obtained.
【００２２】[0022]
【表３】 [Table 3]
【００２３】表１ないし表３および図２ないし図５よ
り、ＭＴカーボンを用いた実施例１，実施例２は、カー
ボン配合量を増大させても急激には抵抗値が低下せず、
シリコーンゴム１００部に対してＭＴカーボンを２５部
程度増量しても、抵抗値はこれにほぼ比例して低下しそ
の割合は緩慢であることが確認された。これに対し、各
比較例では、ごく僅かの部数の変更（例えば比較例１で
は１２部から１４部への２部の増加）により、抵抗値が
急激に低下する領域が存在することが確認された。As can be seen from Tables 1 to 3 and FIGS. 2 to 5, in Examples 1 and 2 using MT carbon, the resistance value did not decrease sharply even when the carbon content was increased.
It was confirmed that even when the amount of MT carbon was increased by about 25 parts with respect to 100 parts of the silicone rubber, the resistance value was reduced almost in proportion to this, and the rate was slow. On the other hand, in each of the comparative examples, it was confirmed that there was a region where the resistance value sharply decreased due to a slight change in the number of copies (for example, in Comparative Example 1, an increase of 2 parts from 12 to 14 parts). Was.
【００２４】［一定電圧印加時の経時変化］（実施例
３）実施例１におけるシリコーン生ゴムをＴＳＥ２６０
−３Ｕ １００部に替え、前記Ｎ９９１を７０部加えた
以外は、実施例１と同様にサンプルの作成および測定を
行い、５００Ｖの電圧印加を継続した状態で３０分およ
び１時間経過時の抵抗値を求め図６に示す結果を得た。[Temporal change when a constant voltage is applied] (Example 3) The silicone raw rubber in Example 1 was subjected to TSE260.
A sample was prepared and measured in the same manner as in Example 1 except that 70 parts of N991 was added instead of 100 parts of -3U, and the resistance value was measured after 30 minutes and 1 hour with 500 V applied. And the result shown in FIG. 6 was obtained.
【００２５】（比較例４）実施例３におけるＮ９９１
を、窒素吸着比表面積２４．０ｍ／ｇ、ＤＢＰ吸油量５
０ｃｍ3／１００ｇ、平均粒子径７８ｎｍであるＳＲＦ
−Ｌ＃３５（旭カーボン社製、商品名）４０部に替えた
以外は、実施例３と同様にサンプルの作成および測定を
行い、図６に示す結果を得た。Comparative Example 4 N991 in Example 3
With a nitrogen adsorption specific surface area of 24.0 m / g and a DBP oil absorption of 5
0 cm 3/100 g, an average particle diameter of 78 nm SRF
A sample was prepared and measured in the same manner as in Example 3, except that the number of parts was changed to -L # 35 (trade name, manufactured by Asahi Carbon Co., Ltd.), and the results shown in FIG. 6 were obtained.
【００２６】図６から、実施例３は電圧印加中ほとんど
抵抗値が変化していないのに対し、比較例４では、３０
分経過後の抵抗値の大幅な低下が確認された。From FIG. 6, it can be seen that the resistance value of Example 3 hardly changes during voltage application, whereas the resistance value of Comparative Example 4 is 30%.
A significant decrease in the resistance value after a lapse of minutes was confirmed.
【００２７】[0027]
【発明の効果】本発明の半導電性シリコーンゴムロール
によれば、ロールの導電弾性層を前述した半導電性シリ
コーンゴム組成物で形成したので、環境変化に対して電
気抵抗が安定しているシリコーンゴムの優れた環境特性
を保持しつつ、添加するカーボンブラックの配合量の変
化に対する半導電性領域における抵抗値の安定性を大幅
に改善することができる。従って、本発明の半導電性シ
リコーンゴムロールは、電子写真装置における転写ロー
ル等の用途に好適なものである。According to the semiconductive silicone rubber roll of the present invention, since the conductive elastic layer of the roll is formed of the above semiconductive silicone rubber composition, the silicone having a stable electric resistance to environmental changes. It is possible to greatly improve the stability of the resistance value in the semiconductive region with respect to the change in the amount of carbon black to be added, while maintaining the excellent environmental characteristics of the rubber. Therefore, the semiconductive silicone rubber roll of the present invention is suitable for use as a transfer roll in an electrophotographic apparatus.
【図１】シート状サンプルの電流値の測定方法を説明す
る図である。FIG. 1 is a diagram illustrating a method for measuring a current value of a sheet-shaped sample.
【図２】実施例１，２で得られたシート状サンプルのカ
ーボン配合量と抵抗値の関係を示すグラフである。FIG. 2 is a graph showing the relationship between the carbon content and the resistance of the sheet-like samples obtained in Examples 1 and 2.
【図３】比較例１で得られたシート状サンプルのカーボ
ン配合量と抵抗値の関係を示すグラフである。FIG. 3 is a graph showing the relationship between the carbon content and the resistance of the sheet-like sample obtained in Comparative Example 1.
【図４】比較例２で得られたシート状サンプルのカーボ
ン配合量と抵抗値の関係を示すグラフである。FIG. 4 is a graph showing the relationship between the carbon content and the resistance of the sheet-like sample obtained in Comparative Example 2.
【図５】比較例３で得られたシート状サンプルのカーボ
ン配合量と抵抗値の関係を示すグラフである。FIG. 5 is a graph showing the relationship between the carbon content and the resistance of the sheet-like sample obtained in Comparative Example 3.
【図６】実施例３および比較例４で得られたシート状サ
ンプルの電圧印加時間と抵抗値の関係を示すグラフであ
る。FIG. 6 is a graph showing the relationship between the voltage application time and the resistance value of the sheet samples obtained in Example 3 and Comparative Example 4.
１ サンプル ２ 主電極 ３ ガード電極 ４ 対向電極 1 sample 2 main electrode 3 guard electrode 4 counter electrode
───────────────────────────────────────────────────── フロントページの続き (72)発明者 澤田 宏治 兵庫県神戸市西区高塚台２丁目１番６号 タイガースポリマー株式会社開発研究所内 Ｆターム(参考） 2H003 CC05 2H032 AA05 3J103 AA02 AA13 AA21 BA41 FA06 FA14 FA18 GA02 GA52 GA57 GA58 GA74 HA03 HA05 HA12 HA20 HA52 HA53 ──────────────────────────────────────────────────の Continuation of the front page (72) Inventor Koji Sawada 2-6-1 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo F-term in Tigers Polymer Co., Ltd. Development Research Laboratory (Reference) 2H003 CC05 2H032 AA05 3J103 AA02 AA13 AA21 BA41 FA06 FA14 FA18 GA02 GA52 GA57 GA58 GA74 HA03 HA05 HA12 HA20 HA52 HA53
Claims (1)
ンゴム層を被覆した半導電性シリコーンゴムロールにお
いて、前記半導電性シリコーンゴム層が、天然ガスの熱
分解により得られるカーボンブラックであって、窒素吸
着比表面積が９．０〜９．５ｍ2／ｇ、ＤＢＰ吸油量が
３４〜４０ｃｍ3／１００ｇ、平均粒子径が２４０〜３
２０ｎｍのＭＴカーボンを含む半導電性シリコーンゴム
組成物により形成されていることを特徴とする半導電性
シリコーンゴムロール。1. A semiconductive silicone rubber roll in which a semiconductive silicone rubber layer is coated on an outer peripheral surface of a conductive core material, wherein the semiconductive silicone rubber layer is carbon black obtained by thermal decomposition of natural gas. Te, nitrogen adsorption specific surface area of 9.0~9.5m 2 / g, DBP oil absorption amount 34~40cm 3 / 100g, an average particle diameter of 240-3
A semi-conductive silicone rubber roll formed of a semi-conductive silicone rubber composition containing 20 nm of MT carbon.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000032658A JP3638008B2 (en) | 2000-02-03 | 2000-02-03 | Semiconductive silicone rubber roll |
| US09/662,040 US6444323B1 (en) | 1999-09-21 | 2000-09-14 | Semi-conductive silicone rubber composition |
| DE2000633101 DE60033101T2 (en) | 1999-09-21 | 2000-09-21 | Semiconducting silicone rubber composition |
| EP20000120156 EP1088849B1 (en) | 1999-09-21 | 2000-09-21 | Semi-conductive silicone rubber composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000032658A JP3638008B2 (en) | 2000-02-03 | 2000-02-03 | Semiconductive silicone rubber roll |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001221225A true JP2001221225A (en) | 2001-08-17 |
| JP3638008B2 JP3638008B2 (en) | 2005-04-13 |
Family
ID=18557230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000032658A Expired - Fee Related JP3638008B2 (en) | 1999-09-21 | 2000-02-03 | Semiconductive silicone rubber roll |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3638008B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6945921B2 (en) * | 2002-05-16 | 2005-09-20 | Ict Coatings N.V. | Roller for a printer, fax machine or copier |
| US7138090B2 (en) | 2003-04-11 | 2006-11-21 | Therm-O-Disc, Incorporated | Vapor sensor and materials therefor |
| JP2007328137A (en) * | 2006-06-08 | 2007-12-20 | Ricoh Co Ltd | Electrifying member, image forming apparatus and process cartridge |
| US7645422B2 (en) | 2003-04-11 | 2010-01-12 | Therm-O-Disc, Incorporated | Vapor sensor and materials therefor |
| US7708947B2 (en) | 2005-11-01 | 2010-05-04 | Therm-O-Disc, Incorporated | Methods of minimizing temperature cross-sensitivity in vapor sensors and compositions therefor |
| US8012420B2 (en) | 2006-07-18 | 2011-09-06 | Therm-O-Disc, Incorporated | Robust low resistance vapor sensor materials |
| US8691390B2 (en) | 2007-11-20 | 2014-04-08 | Therm-O-Disc, Incorporated | Single-use flammable vapor sensor films |
| JP2018077347A (en) * | 2016-11-09 | 2018-05-17 | 富士ゼロックス株式会社 | Conductive member for image forming apparatus, transfer unit for image forming apparatus, and image forming apparatus |
| WO2018193705A1 (en) * | 2017-04-18 | 2018-10-25 | 信越化学工業株式会社 | High dielectric insulating silicone rubber composition and electric field relaxation layer |
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2000
- 2000-02-03 JP JP2000032658A patent/JP3638008B2/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6945921B2 (en) * | 2002-05-16 | 2005-09-20 | Ict Coatings N.V. | Roller for a printer, fax machine or copier |
| US7138090B2 (en) | 2003-04-11 | 2006-11-21 | Therm-O-Disc, Incorporated | Vapor sensor and materials therefor |
| US7645422B2 (en) | 2003-04-11 | 2010-01-12 | Therm-O-Disc, Incorporated | Vapor sensor and materials therefor |
| US7708947B2 (en) | 2005-11-01 | 2010-05-04 | Therm-O-Disc, Incorporated | Methods of minimizing temperature cross-sensitivity in vapor sensors and compositions therefor |
| JP2007328137A (en) * | 2006-06-08 | 2007-12-20 | Ricoh Co Ltd | Electrifying member, image forming apparatus and process cartridge |
| US8105538B2 (en) | 2006-07-18 | 2012-01-31 | Therm-O-Disc Incorporated | Robust low resistance vapor sensor materials |
| US8012420B2 (en) | 2006-07-18 | 2011-09-06 | Therm-O-Disc, Incorporated | Robust low resistance vapor sensor materials |
| US8691390B2 (en) | 2007-11-20 | 2014-04-08 | Therm-O-Disc, Incorporated | Single-use flammable vapor sensor films |
| JP2018077347A (en) * | 2016-11-09 | 2018-05-17 | 富士ゼロックス株式会社 | Conductive member for image forming apparatus, transfer unit for image forming apparatus, and image forming apparatus |
| WO2018193705A1 (en) * | 2017-04-18 | 2018-10-25 | 信越化学工業株式会社 | High dielectric insulating silicone rubber composition and electric field relaxation layer |
| CN110520481A (en) * | 2017-04-18 | 2019-11-29 | 信越化学工业株式会社 | High dielectric insulation silicone rubber compound and electric field relaxation layer |
| JPWO2018193705A1 (en) * | 2017-04-18 | 2020-01-16 | 信越化学工業株式会社 | High dielectric insulating silicone rubber composition and electric field relaxation layer |
| US11434345B2 (en) | 2017-04-18 | 2022-09-06 | Shin-Etsu Chemical Co., Ltd. | High dielectric insulating silicone rubber composition and electric field relaxation layer |
| JP7210433B2 (en) | 2017-04-18 | 2023-01-23 | 信越化学工業株式会社 | High dielectric insulating silicone rubber composition and electric field relaxation layer |
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