JP5097327B2 - Rubber composition and conductive roller using the same - Google Patents
Rubber composition and conductive roller using the same Download PDFInfo
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Description
本発明は、ゴム組成物及びそれを用いた導電性ローラに関し、特に、複写機、レーザープリンター、ファクシミリ等の電子写真複写装置に使用する導電性ローラ用ゴム組成物に関するものである。 The present invention relates to a rubber composition and a conductive roller using the same, and more particularly to a rubber composition for a conductive roller used in an electrophotographic copying apparatus such as a copying machine, a laser printer, and a facsimile machine.
電子写真複写装置等に使用される導電性ローラには、高品位な画像を得るために、通常、適当な導電性を有する低硬度のゴム組成物が使用されている。また、かかるゴム組成物を用いた導電性ローラは、その品質を一定に保つため、硬度及び抵抗のバラツキが少ないこと等が必要である。 In order to obtain a high-quality image, a low-hardness rubber composition having appropriate conductivity is generally used for a conductive roller used in an electrophotographic copying machine or the like. In addition, a conductive roller using such a rubber composition needs to have less variations in hardness and resistance in order to keep its quality constant.
近年、更に高品位な画像が求められており、導電性ローラに要求される性能として、硬度及び抵抗のバラツキが少ないこと等に加えて、更に低硬度で且つ圧縮永久歪みが小さいことが求められている。ここで、通常、導電性ローラの低硬度化方法としては、(i)導電性ローラに用いるゴム組成物の発泡体化、及び(ii)導電性ローラに用いるゴム組成物の可塑化が挙げられる。 In recent years, higher quality images have been demanded, and the performance required for the conductive roller is required to be lower in hardness and smaller in compression set in addition to less variation in hardness and resistance. ing. Here, the methods for reducing the hardness of the conductive roller usually include (i) foaming the rubber composition used for the conductive roller, and (ii) plasticizing the rubber composition used for the conductive roller. .
ところで、ゴム組成物を発泡体化して導電性ローラを形成することで、導電性ローラを容易に低硬度化することが可能であるが、この場合、導電性ローラの抵抗及び硬度のバラツキが大きくなり、更に導電性ローラの圧縮永久歪みが大きくなるという欠点がある。 By the way, it is possible to easily reduce the hardness of the conductive roller by forming the conductive composition by foaming the rubber composition. In this case, however, there is a large variation in resistance and hardness of the conductive roller. Furthermore, there is a drawback that the compression set of the conductive roller is increased.
一方、可塑化したゴム組成物を用いて導電性ローラを形成する場合、導電性ローラの抵抗及び硬度のバラツキが比較的小さくなるものの、ゴム組成物の加工性の観点からの制約により、ゴム組成物への可塑剤の添加量が制限される。そのため、ゴム組成物を十分に低硬度化することができず、所望の硬度の導電性ローラを得ることができない。また、この場合も、導電性ローラの圧縮永久歪みが大きいという欠点がある。 On the other hand, when a conductive roller is formed using a plasticized rubber composition, the variation in resistance and hardness of the conductive roller is relatively small, but due to restrictions from the viewpoint of processability of the rubber composition, the rubber composition The amount of plasticizer added to the product is limited. Therefore, the rubber composition cannot be sufficiently reduced in hardness, and a conductive roller having a desired hardness cannot be obtained. Also in this case, there is a drawback that the compression set of the conductive roller is large.
そこで、本発明の目的は、上記従来技術の問題を解決し、硬度及び抵抗のバラツキが少ないことに加え、低硬度で且つ圧縮永久歪みの小さい導電性ローラを形成することが可能なゴム組成物を提供することにある。本発明の他の目的は、該ゴム組成物を用いた導電性ローラを提供することにある。 Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to form a conductive roller having a low hardness and a small compression set in addition to a small variation in hardness and resistance. Is to provide. Another object of the present invention is to provide a conductive roller using the rubber composition.
本発明者らは、上記目的を達成するために鋭意検討した結果、膨潤剤で膨潤させた架橋ゴムが非膨潤状態の架橋ゴムに比べて硬度及び圧縮永久歪みが低く、また、架橋ゴムからの膨潤剤の漏出が無いことに着目し、ゴム成分に低分子量液状化合物と高吸油性充填剤とを配合することで、硬度及び圧縮永久歪みが小さいゴム組成物が得られることを見出し、本発明を完成させるに至った。 As a result of intensive studies to achieve the above object, the present inventors have found that a crosslinked rubber swollen with a swelling agent has a lower hardness and compression set than a crosslinked rubber in a non-swelled state. Focusing on the fact that there is no leakage of the swelling agent, it has been found that a rubber composition having a low hardness and compression set can be obtained by blending a low molecular weight liquid compound and a highly oil-absorbing filler into the rubber component. It came to complete.
即ち、本発明のゴム組成物は、ゴム成分（Ａ）に対して、分子量1500以下の低分子量液状化合物（Ｂ）とＤＢＰ（ジブチルフタレート）吸油量が170 mL/100g以上の高吸油性充填剤（Ｃ）とを配合してなり、
前記低分子量液状化合物（Ｂ）がアジピン酸エステル類であり、
前記高吸油性充填剤（Ｃ）がケッチェンブラックであり、
前記ゴム成分（Ａ）と前記低分子量液状化合物（Ｂ）との質量比（Ａ／Ｂ）が70/30〜45/55で、且つ前記高吸油性充填剤（Ｃ）の配合量が前記ゴム成分（Ａ）と前記低分子量液状化合物（Ｂ）との合計100質量部に対して1〜10質量部であることを特徴とする。
That is, the rubber composition of the present invention comprises a high-oil-absorbent filler having a low molecular weight liquid compound (B) having a molecular weight of 1500 or less and a DBP (dibutyl phthalate) oil absorption of 170 mL / 100 g or more relative to the rubber component (A) (C) is blended,
The low molecular weight liquid compound (B) is adipic acid esters,
The highly oil-absorbing filler (C) is ketjen black,
The rubber component (A) and the low molecular weight liquid compound (B) have a mass ratio (A / B) of 70/30 to 45/55, and the blending amount of the highly oil-absorbing filler (C) is the rubber. It is 1-10 mass parts with respect to a total of 100 mass parts of a component (A) and the said low molecular weight liquid compound (B), It is characterized by the above-mentioned.
本発明のゴム組成物の好適例においては、前記高吸油性充填剤（Ｃ）のＤＢＰ吸油量が170〜550mL/100gである。 In a preferred example of the rubber composition of the present invention, the DBP oil absorption amount of the highly oil-absorbing filler (C) is 170 to 550 mL / 100 g.
本発明のゴム組成物において、前記ゴム成分（Ａ）としては、アクリロニトリル・ブタジエンゴム（ＮＢＲ）が好ましい。 In the rubber composition of the present invention, the rubber component (A) is preferably acrylonitrile-butadiene rubber (NBR).
本発明のゴム組成物の他の好適例においては、該ゴム組成物は、アスカーＣ硬度が55度以下で、且つ圧縮永久歪みが10％以下である。 In another preferred embodiment of the rubber composition of the present invention, the rubber composition has an Asker C hardness of 55 degrees or less and a compression set of 10% or less.
また、本発明の導電性ローラは、上記のゴム組成物を用いたことを特徴とする。 Further, the conductive roller of the present invention is characterized by using the above rubber composition.
本発明によれば、ゴム成分に低分子量液状化合物と高吸油性充填剤とを配合してなり、硬度及び圧縮永久歪みが小さく、導電性ローラに好適なゴム組成物を提供することができる。また、かかるゴム組成物を用いた、硬度及び抵抗のバラツキが少なく、低硬度で且つ圧縮永久歪みの小さい導電性ローラを提供することができる。 According to the present invention, it is possible to provide a rubber composition suitable for a conductive roller, which is obtained by blending a low molecular weight liquid compound and a highly oil-absorbing filler with a rubber component and has low hardness and compression set. In addition, it is possible to provide a conductive roller using such a rubber composition, which has less variations in hardness and resistance, low hardness, and small compression set.
以下に、本発明を詳細に説明する。本発明のゴム組成物は、ゴム成分（Ａ）に対して、分子量1500以下の低分子量液状化合物（Ｂ）とＤＢＰ吸油量が170 mL/100g以上の高吸油性充填剤（Ｃ）とを配合してなり、前記ゴム成分（Ａ）と前記低分子量液状化合物（Ｂ）との質量比（Ａ／Ｂ）が70/30〜45/55で、且つ前記高吸油性充填剤（Ｃ）の配合量が前記ゴム成分（Ａ）と前記低分子量液状化合物（Ｂ）との合計100質量部に対して1〜10質量部であることを特徴とする。本発明のゴム組成物は、低分子量の液状化合物（Ｂ）を含有し、該液状化合物が可塑剤として作用するため、低硬度である。また、低分子量の液状化合物（Ｂ）が膨潤剤としても作用するため、本発明のゴム組成物は、圧縮永久歪みが小さい。更に、本発明のゴム組成物は、高吸油性充填剤（Ｃ）が配合されているため、ゴム成分（Ａ）への低分子量液状化合物（Ｂ）の配合が実用上の観点から可能であり、ゴム組成物の混練り時等における加工性も良好である。また更に、本発明のゴム組成物は、従来のゴム組成物の発泡体とは異なり、硬度及び抵抗値のバラツキが小さい。 The present invention is described in detail below. The rubber composition of the present invention comprises a low molecular weight liquid compound (B) having a molecular weight of 1500 or less and a high oil absorption filler (C) having a DBP oil absorption of 170 mL / 100 g or more to the rubber component (A). The mass ratio (A / B) between the rubber component (A) and the low molecular weight liquid compound (B) is 70/30 to 45/55, and the high oil absorbing filler (C) is blended. The amount is 1 to 10 parts by mass with respect to 100 parts by mass in total of the rubber component (A) and the low molecular weight liquid compound (B). The rubber composition of the present invention contains a low molecular weight liquid compound (B) and has a low hardness because the liquid compound acts as a plasticizer. Moreover, since the low molecular weight liquid compound (B) also acts as a swelling agent, the rubber composition of the present invention has a small compression set. Furthermore, since the rubber composition of the present invention is blended with the highly oil-absorbing filler (C), blending of the low molecular weight liquid compound (B) into the rubber component (A) is possible from a practical viewpoint. Also, the processability during kneading of the rubber composition is good. Furthermore, the rubber composition of the present invention has a small variation in hardness and resistance value, unlike the foam of the conventional rubber composition.
本発明のゴム組成物に用いるゴム成分（Ａ）としては、アクリロニトリル・ブタジエンゴム（ＮＢＲ）、天然ゴム（ＮＲ）、ポリイソプレンゴム（ＩＲ）、ポリブタジエンゴム（ＢＲ）、スチレン・ブタジエンゴム（ＳＢＲ）、ブチルゴム（ＩＩＲ）、クロロプレンゴム（ＣＲ）、アクリルゴム、シリコーンゴム、エチレン・プロピレン・ジエンゴム（ＥＰＤＭ）、エピクロロヒドリンゴム（ＥＣＯ）等が挙げられ、これらの中でもアクリロニトリル・ブタジエンゴムが好ましい。これらゴム成分は、一種単独で用いても、二種以上のブレンドとして用いてもよい。 The rubber component (A) used in the rubber composition of the present invention includes acrylonitrile-butadiene rubber (NBR), natural rubber (NR), polyisoprene rubber (IR), polybutadiene rubber (BR), and styrene-butadiene rubber (SBR). Butyl rubber (IIR), chloroprene rubber (CR), acrylic rubber, silicone rubber, ethylene / propylene / diene rubber (EPDM), epichlorohydrin rubber (ECO), etc. Among them, acrylonitrile / butadiene rubber is preferable. These rubber components may be used alone or as a blend of two or more.
本発明のゴム組成物に用いる低分子量液状化合物（Ｂ）は、分子量が1500以下のアジピン酸エステル類で、可塑剤としての機能と膨潤剤としての機能を有する。低分子量液状化合物（Ｂ）の分子量が1500を超えると、ゴム組成物の可塑化と膨潤化の効果が著しく小さくなり、ゴム組成物を充分に低硬度化及び低圧縮永久歪み化することができない。ここで、該低分子量液状化合物（Ｂ）としては、ジメチルアジペート、ジブチルアジペート、ジイソブチルアジペート、ビス(２-エチルヘキシル)アジペート、ジ-ｎ-オクチルアジペート、アジピン酸ポリエステル等のアジピン酸エステル類が挙げられる。 The low molecular weight liquid compound (B) used in the rubber composition of the present invention is an adipic acid ester having a molecular weight of 1500 or less and has a function as a plasticizer and a function as a swelling agent. When the molecular weight of the low molecular weight liquid compound (B) exceeds 1500, the effect of plasticizing and swelling the rubber composition is remarkably reduced, and the rubber composition cannot be sufficiently reduced in hardness and compression set. . Here, the low molecular weight liquid compound (B), dimethyl adipate, dibutyl adipate, diisobutyl adipate, bis (2-ethylhexyl) adipate, di -n- octyl adipate, adipic acid esters such as adipic acid polyester .
本発明のゴム組成物において、上記ゴム成分（Ａ）と低分子量液状化合物（Ｂ）とは、質量比（Ａ／Ｂ）が70/30〜45/55となるように配合される。該質量比（Ａ／Ｂ）が80/20を超えると、ゴム成分（Ａ）に対して低分子量液状化合物（Ｂ）の量が少なすぎ、ゴム組成物を充分に低硬度化することができず、一方、質量比（Ａ／Ｂ）が45/55未満では、ゴム成分（Ａ）に対して低分子量液状化合物（Ｂ）の量が多すぎ、ゴム組成物の混練り等における加工性が悪化する。
In the rubber composition of the present invention, the rubber component (A) and the low molecular weight liquid compound (B) are blended so that the mass ratio (A / B) is 70/30 to 45/55. If the mass ratio (A / B) exceeds 80/20, the amount of the low molecular weight liquid compound (B) is too small relative to the rubber component (A), and the rubber composition can be sufficiently reduced in hardness. On the other hand, if the mass ratio (A / B) is less than 45/55, the amount of the low molecular weight liquid compound (B) is too large relative to the rubber component (A), and the processability in kneading of the rubber composition, etc. Getting worse.
本発明のゴム組成物に用いる高吸油性充填剤（Ｃ）は、ＤＢＰ（ジブチルフタレート）吸油量が170 mL/100g以上である限り、特に限定されるものではないが、ＤＢＰ吸油量が170〜550 mL/100gの範囲内にあるものが好ましい。高吸油性充填剤（Ｃ）のＤＢＰ吸油量が170 mL/100g未満では、上記低分子量液状化合物（Ｂ）を充分に吸収することができないため、ゴム組成物の混練り等における加工性が悪化し、ＤＢＰ吸油量が550 mL/100gを超えると、ゴム組成物の硬度が高くなりすぎ、低硬度なゴム組成物が得られないことがある。上記高吸油性充填剤（Ｃ）は、ケッチェンブラックである。該ケッチェンブラックは、殻状の構造を有し、低分子量液状化合物（Ｂ）の吸収能に優れている。また、高い導電性付与効果を有し、導電剤としても作用する。 The highly oil-absorbing filler (C) used in the rubber composition of the present invention is not particularly limited as long as the DBP (dibutyl phthalate) oil absorption is 170 mL / 100 g or more, but the DBP oil absorption is 170 to Those within the range of 550 mL / 100 g are preferred. If the DBP oil absorption of the highly oil-absorbing filler (C) is less than 170 mL / 100 g, the low molecular weight liquid compound (B) cannot be sufficiently absorbed, so the processability in kneading the rubber composition is deteriorated. However, if the DBP oil absorption exceeds 550 mL / 100 g, the rubber composition may be too hard and a low-hardness rubber composition may not be obtained. The high oil-absorbing filler (C) is a ketjen black. The ketjen black has a shell-like structure and is excellent in the ability to absorb the low molecular weight liquid compound (B). Moreover, it has a high conductivity imparting effect and acts as a conductive agent.
上記高吸油性充填剤（Ｃ）の配合量は、上記ゴム成分（Ａ）と低分子量液状化合物（Ｂ）との合計100質量部に対して1〜10質量部の範囲である。高吸油性充填剤（Ｃ）の配合量が、ゴム成分（Ａ）及び低分子量液状化合物（Ｂ）の合計100質量部に対して1質量部未満では、低分子量液状化合物（Ｂ）を充分に吸収できないため配合が困難となり、10質量部を超えると、ゴム組成物の硬度が高くなりすぎ、低硬度なゴム組成物を得ることができなくなる。 The amount of the highly oil-absorbing filler (C) is in the range of 1 to 10 parts by mass with respect to 100 parts by mass in total of the rubber component (A) and the low molecular weight liquid compound (B). When the blending amount of the high oil-absorbing filler (C) is less than 1 part by mass with respect to 100 parts by mass in total of the rubber component (A) and the low molecular weight liquid compound (B), the low molecular weight liquid compound (B) is sufficiently If it exceeds 10 parts by mass, the rubber composition becomes too hard and a low-hardness rubber composition cannot be obtained.
本発明のゴム組成物には、上記ゴム成分（Ａ）、低分子量液状化合物（Ｂ）及び高吸油性充填剤（Ｃ）の他に、ゴム工業界で通常使用される各種配合剤、例えば、炭酸カルシウム等の充填剤、亜鉛華、ステアリン酸、過酸化物等の架橋剤、カーボン導電剤、イオン導電剤、金属酸化物粉末、金属粉末等の導電剤（充填剤としての機能を兼ね備えるものも含む）等を、本発明の目的を損なわない範囲で適宜選択して配合することができる。これら配合剤は、市販品を好適に使用することができる。なお、本発明のゴム組成物は、ゴム成分（Ａ）に、低分子量液状化合物（Ｂ）及び高吸油性充填剤（Ｃ）と必要に応じて適宜選択した各種配合剤とを配合して、公知の方法で製造することができる。 In the rubber composition of the present invention, in addition to the rubber component (A), the low molecular weight liquid compound (B) and the highly oil-absorbing filler (C), various compounding agents commonly used in the rubber industry, for example, Fillers such as calcium carbonate, cross-linking agents such as zinc white, stearic acid, peroxide, etc., conductive agents such as carbon conductive agents, ionic conductive agents, metal oxide powders, metal powders (those that also function as fillers) Etc.) can be appropriately selected and blended within a range not impairing the object of the present invention. As these compounding agents, commercially available products can be suitably used. The rubber composition of the present invention is blended with the rubber component (A) with the low molecular weight liquid compound (B) and the high oil-absorbing filler (C) and various compounding agents appropriately selected as necessary. It can be produced by a known method.
本発明のゴム組成物は、架橋後の物性として、アスカーＣ硬度が55度以下で、且つ圧縮永久歪みが10％以下であるのが好ましい。かかる物性を有するゴム組成物は、低硬度で圧縮永久歪みの小さい導電性ローラを製造するのに好適である。 The rubber composition of the present invention preferably has an Asker C hardness of 55 degrees or less and a compression set of 10% or less as physical properties after crosslinking. The rubber composition having such physical properties is suitable for producing a conductive roller having a low hardness and a small compression set.
本発明の導電性ローラは、上述のゴム組成物を用いたことを特徴とし、硬度及び抵抗のバラツキが少なく、低硬度で且つ圧縮永久歪みが小さい。本発明の導電性ローラは、上記ゴム組成物以外に、金属製シャフト等の他の部材を備えてもよい。なお、本発明の導電性ローラは、特に限定されるものではないが、ローラ抵抗が104〜106Ωであるのが好ましい。本発明の導電性ローラは、例えば、中心部に金属製のシャフトを配置した所望の形状の金型内に、上記ゴム組成物を射出し、架橋させて製造することができる。 The conductive roller of the present invention is characterized by using the above-mentioned rubber composition, has less variations in hardness and resistance, low hardness, and small compression set. The conductive roller of the present invention may include other members such as a metal shaft in addition to the rubber composition. The conductive roller of the present invention is not particularly limited, but the roller resistance is preferably 10 4 to 10 6 Ω. The conductive roller of the present invention can be produced by, for example, injecting the above rubber composition into a mold having a desired shape in which a metal shaft is disposed at the center and crosslinking.
以下に、実施例を挙げて本発明を更に詳しく説明するが、本発明は下記の実施例に何ら限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.
表１に示す配合処方のゴム組成物をニーダー及びロールで混練りして調製した。この際、ニーダー及びロールでの加工性を観察した。各ゴム組成物の加工性を表１に示す。表１中、○は加工性が良好で、×は加工性が悪かったことを示す。 A rubber composition having a formulation shown in Table 1 was prepared by kneading with a kneader and a roll. At this time, workability with a kneader and a roll was observed. Table 1 shows the processability of each rubber composition. In Table 1, ○ indicates that the workability is good and × indicates that the workability is poor.
得られたゴム組成物をＬＩＭ（Liquid injection Molding）で、予め外径8mmの芯金が装着された金型に射出成形し、160℃で15分間加熱してゴム組成物を架橋させ、外径16mmで長さ240mmのゴム製ローラを作製した。得られたローラの両端を約5mmづつ切断して、全長230mmの評価用ローラを作製した。得られた評価用ローラに対して、下記の方法で硬度、ローラ抵抗及び圧縮永久歪みを測定した。結果を表１に示す。 The obtained rubber composition is injection-molded by LIM (Liquid injection Molding) into a mold that has been previously fitted with a core metal with an outer diameter of 8 mm, heated at 160 ° C. for 15 minutes to crosslink the rubber composition, and the outer diameter A rubber roller having a length of 16 mm and a length of 240 mm was produced. Both ends of the obtained roller were cut by about 5 mm, and an evaluation roller having a total length of 230 mm was produced. The obtained evaluation roller was measured for hardness, roller resistance, and compression set by the following methods. The results are shown in Table 1.
（１）硬度
アスカーＣ硬度計［高分子計器(株)製］を用い、ローラを周方向に８分割して各部のアスカーＣ硬度を測定し、その平均値を求めた。また、測定値の最大値と最小値との差を硬度のバラツキとした。
(1) Hardness Using an Asker C hardness meter [manufactured by Kobunshi Keiki Co., Ltd.], the roller was divided into eight parts in the circumferential direction, and the Asker C hardness of each part was measured. Further, the difference between the maximum value and the minimum value of the measured values was regarded as the variation in hardness.
（２）ローラ抵抗
抵抗測定器Ｒ８３４０［アドバンテスト(株)製］を用い、ローラの両端に各500gfの荷重をかけ、金属製の対向回転電極を接触させてローラを回転させながら、周方向の３６点の抵抗値を測定し、抵抗値の常用対数の平均値を求めた。また、抵抗値の常用対数の最大値と最小値との差をローラ抵抗のバラツキとして評価した。
(2) Roller resistance Using a resistance measuring instrument R8340 [manufactured by Advantest Co., Ltd.] The resistance value of the point was measured, and the average value of the common logarithm of the resistance value was obtained. Further, the difference between the maximum value and the minimum value of the common logarithm of the resistance value was evaluated as the variation of the roller resistance.
（３）圧縮永久歪み
ＪＩＳ Ｋ-６３０１（１９７５）に準拠して圧縮永久歪みを測定した。即ち、直径29mmで高さ12.7mmの試験片に対し、規定の熱処理条件（70℃で22時間）の下、試験片を高さ方向に25％圧縮して、圧縮永久歪みを求めた。
(3) Compression set The compression set was measured according to JIS K-6301 (1975). That is, for a test piece having a diameter of 29 mm and a height of 12.7 mm, the test piece was compressed by 25% in the height direction under a prescribed heat treatment condition (at 70 ° C. for 22 hours) to obtain a compression set.
*1 日本ゼオン(株)製, Ｎｉｐｏｌ ＤＮ４０１ＬＬ.
*2 大八化学(株)製, ジオクチルアジペート, 分子量371.
*3 旭電化(株)製, アジピン酸系ポリエステルＰＮ-１５０, 分子量約1000.
*4 日本ゼオン(株)製, 液状ポリブタジエン＃１３０, 分子量3200.
*5 ライオン(株)製, ケッチェンブラックＥＣ６００ＪＤ, ＤＢＰ吸油量495mL/100g.
*6 日本油脂(株)製, パーヘキサＣ-４０.
* 1 Made by Nippon Zeon Co., Ltd., Nipol DN401LL.
* 2 Made by Daihachi Chemical Co., Ltd., Dioctyl adipate, Molecular weight 371.
* 3 Asahi Denka Co., Ltd., adipic acid type polyester PN-150, molecular weight about 1000.
* 4 Made by Nippon Zeon Co., Ltd., liquid polybutadiene # 130, molecular weight 3200.
* 5 Made by Lion Co., Ltd., Ketjen Black EC600JD, DBP oil absorption 495mL / 100g.
* 6 Perhexa C-40 manufactured by NOF Corporation.
ゴム成分（Ａ）と低分子量液状化合物（Ｂ）と高吸油性充填剤（Ｃ）とを本発明で規定する配合割合で配合したゴム組成物を用いた実施例のローラは、アスカーＣ硬度が55度以下と充分に低く、且つ圧縮永久歪みが10％以下と充分に小さかった。また、硬度及び抵抗値のバラツキも充分に小さかった。 The roller of the Example using the rubber composition which mix | blended the rubber component (A), the low molecular weight liquid compound (B), and the highly oil-absorbing filler (C) with the compounding ratio prescribed | regulated by this invention has Asker C hardness. It was sufficiently low as 55 degrees or less and the compression set was sufficiently small as 10% or less. Also, the variation in hardness and resistance value was sufficiently small.
比較例１のローラは、ゴム組成物中のゴム成分（Ａ）に対する低分子量液状化合物（Ｂ）の割合が低すぎるため、硬度が高すぎた。一方、比較例２のローラに用いたゴム組成物は、ゴム組成物中のゴム成分（Ａ）に対する低分子量液状化合物（Ｂ）の割合が高すぎるため、混練時の加工性が悪く実用に供し得なかった。 The roller of Comparative Example 1 was too hard because the ratio of the low molecular weight liquid compound (B) to the rubber component (A) in the rubber composition was too low. On the other hand, since the ratio of the low molecular weight liquid compound (B) to the rubber component (A) in the rubber composition is too high, the rubber composition used for the roller of Comparative Example 2 has poor workability during kneading and is practically used. I didn't get it.
また、比較例３のローラに用いたゴム組成物は、高吸油性充填剤（Ｃ）の配合量が少なすぎるため、低分子量液状化合物（Ｂ）を充分に吸収できなかった。一方、比較例４のローラは、ゴム組成物中の高吸油性充填剤（Ｃ）の配合量が多すぎるため、硬度が高すぎた。 Moreover, since the rubber composition used for the roller of Comparative Example 3 contained too little high oil-absorbing filler (C), the low molecular weight liquid compound (B) could not be sufficiently absorbed. On the other hand, the roller of Comparative Example 4 was too hard because the amount of the highly oil-absorbing filler (C) in the rubber composition was too large.
更に、比較例５のローラは、低分子量液状化合物（Ｂ）に代えて分子量が1500を超える液状ポリマーを配合したゴム組成物を用いているため、硬度が高く、且つ圧縮永久歪みも著しく大きかった。 Furthermore, since the roller of Comparative Example 5 uses a rubber composition containing a liquid polymer having a molecular weight of more than 1500 instead of the low molecular weight liquid compound (B), the roller has a high hardness and a very large compression set. .
Claims (5)
前記低分子量液状化合物（Ｂ）がアジピン酸エステル類であり、
前記高吸油性充填剤（Ｃ）がケッチェンブラックであり、
前記ゴム成分（Ａ）と前記低分子量液状化合物（Ｂ）との質量比（Ａ／Ｂ）が70/30〜45/55で、且つ前記高吸油性充填剤（Ｃ）の配合量が前記ゴム成分（Ａ）と前記低分子量液状化合物（Ｂ）との合計100質量部に対して1〜10質量部であることを特徴とするゴム組成物。 The rubber component (A) is blended with a low molecular weight liquid compound (B) having a molecular weight of 1500 or less and a high oil absorbing filler (C) having a DBP oil absorption of 170 mL / 100 g or more,
The low molecular weight liquid compound (B) is adipic acid esters,
The highly oil-absorbing filler (C) is ketjen black,
The rubber component (A) and the low molecular weight liquid compound (B) have a mass ratio (A / B) of 70/30 to 45/55, and the blending amount of the highly oil-absorbing filler (C) is the rubber. 1 to 10 parts by mass with respect to 100 parts by mass in total of the component (A) and the low molecular weight liquid compound (B).
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