JP3506272B2 - Rubber composition - Google Patents
Rubber compositionInfo
- Publication number
- JP3506272B2 JP3506272B2 JP21305594A JP21305594A JP3506272B2 JP 3506272 B2 JP3506272 B2 JP 3506272B2 JP 21305594 A JP21305594 A JP 21305594A JP 21305594 A JP21305594 A JP 21305594A JP 3506272 B2 JP3506272 B2 JP 3506272B2
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- JP
- Japan
- Prior art keywords
- parts
- weight
- epdm
- rubber
- rubber composition
- 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.)
- Expired - Fee Related
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- Electrophotography Configuration And Component (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Dry Development In Electrophotography (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はゴム組成物に関するもの
であって、より詳しくは複写機、プリンター等の電子写
真装置、静電記録装置等に用いられるローラ、ブレー
ド、ベルト等の部材に好適に使用されるゴム組成物に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition, and more specifically, it is suitable for members such as rollers, blades and belts used in electrophotographic devices such as copying machines and printers and electrostatic recording devices. The present invention relates to a rubber composition used in.
【０００２】[0002]
【従来の技術】従来、複写機、プリンター等の電子写真
装置や静電記録装置においてゴム組成物からなる部材が
数多く用いられ、電子写真プロセスの中で帯電、現像、
転写、トナー層形成、クリーニング、定着、給紙、紙の
搬送等の多様な役割を果たしている。これらのプロセス
で用いられるゴム部材として低硬度のものが性能上望ま
しいとされているにも拘らず、幾つかの理由により発泡
体以外では実現が困難であった。低硬度品が望ましいの
は各プロセスでの設計許容範囲が広がるためであり、例
えば現像ローラでは感光体への当たりが良いためトナー
搬送がし易くなる。2. Description of the Related Art Conventionally, a large number of members made of a rubber composition have been used in electrophotographic devices such as copying machines and printers, and electrostatic recording devices.
It plays various roles such as transfer, toner layer formation, cleaning, fixing, paper feeding, and paper transportation. Despite the fact that a rubber member having a low hardness is desirable in terms of performance as a rubber member used in these processes, it has been difficult to realize the material other than the foam for some reasons. The low-hardness product is desirable because the design allowable range in each process is widened. For example, since the developing roller hits the photosensitive member well, the toner can be easily transported.
【０００３】例えば、感光体上の静電潜像を記録紙に転
写する転写プロセスで用いられる転写ローラには発泡体
が使用されている。しかし高電圧が印加される帯電ロー
ラ、トナーを感光体上に形成する現像ローラでは耐久
性、画像の精細さ、信頼性の点で発泡体を用いることが
困難である。又記録紙を搬送する給紙ローラにおいても
耐摩耗性の点で発泡体がその要求を満たすことが難し
い。For example, a foam is used for a transfer roller used in a transfer process for transferring an electrostatic latent image on a photoconductor onto recording paper. However, in a charging roller to which a high voltage is applied and a developing roller that forms toner on a photosensitive member, it is difficult to use a foam in terms of durability, image fineness and reliability. Further, it is difficult for the foam to meet the requirement in terms of abrasion resistance even in the paper feed roller for conveying the recording paper.
【０００４】発泡体ではなく低硬度部材を実現しようと
した場合、組成物に可塑剤、伸展油等を配合して、相対
的な高分子含有量を減少させて硬度を低下させる方法が
あるが、可塑剤、伸展油等の低分子物はブリードアウト
するという問題があり、感光体や記録紙を汚染してしま
うため電子写真プロセスの部材としては必ずしも適当と
は言えない。又ブリードアウトによる汚染の問題を解決
する為に、感光体や記録紙に直に接触する外層のみを非
汚染性の樹脂或はゴムで被覆するという方法も提案され
ているが製造プロセス等が複雑になり、又安価な電子写
真用ゴム材料を提供することが困難である。In order to realize a low hardness member instead of a foamed material, there is a method of blending a plasticizer, an extending oil and the like into the composition to reduce the relative polymer content and thereby reduce the hardness. However, low molecular weight substances such as plasticizers and extender oils have the problem of bleeding out, which contaminates the photoconductor and recording paper and is therefore not necessarily suitable as a member of the electrophotographic process. In order to solve the problem of contamination due to bleed-out, a method has been proposed in which only the outer layer that directly contacts the photoconductor or recording paper is covered with a non-contaminating resin or rubber, but the manufacturing process is complicated. In addition, it is difficult to provide an inexpensive electrophotographic rubber material.
【０００５】[0005]
【発明が解決しようとする課題】本発明はこのような事
情に鑑みてなされたもので、複写機、プリンター等の電
子写真装置、静電記録装置等にゴム部材として用いた場
合に低硬度でしかも耐久性に優れ、かつ非汚染性を有す
るゴム組成物を提供することを目的とする。又、ゴム組
成物の架橋度を下げて低硬度を実現しようとすると圧縮
永久歪みが大きくなり耐久性の点で好ましくない。低硬
度で、圧縮永久歪みの小さいゴム組成物を提供すること
も本発明の目的のひとつである。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and has a low hardness when used as a rubber member in an electrophotographic apparatus such as a copying machine or a printer, an electrostatic recording apparatus or the like. Moreover, it is an object of the present invention to provide a rubber composition having excellent durability and non-staining property. Further, if the degree of cross-linking of the rubber composition is reduced to achieve low hardness, compression set becomes large, which is not preferable in terms of durability. It is another object of the present invention to provide a rubber composition having a low hardness and a small compression set.
【０００６】[0006]
【課題を解決するための手段】本発明者等は鋭意検討を
重ねた結果、請求項１の如く、ＥＰＤＭとアクリルゴム
からなる電子写真プロセス部材用ゴム組成物において、
ＥＰＤＭとアクリルゴムの配合比が９５重量部／５重量
部〜５重量部／９５重量部であり、前記アクリルゴム中
に架橋に預かる共重合第３成分が、活性塩素含有モノマ
ーによるもの、カルボキシル含有モノマーによるもの、
エポキシ基含有モノマーによるもの、２−クロロエチル
ビニルエーテルによるもの、または、ビニルクロロアセ
テートによるものであり、かつ、ＪＩＳ−Ａ硬度で４５
°以下である場合に上記目的を達成することを見いだ
し、本発明に到達したものである。以下、本発明につい
て更に詳しく説明する。Means for Solving the Problems As a result of intensive studies made by the present inventors, in a rubber composition for electrophotographic process members comprising EPDM and acrylic rubber as claimed in claim 1,
The compounding ratio of EPDM and acrylic rubber is 95 parts by weight / 5 parts by weight to 5 parts by weight / 95 parts by weight, and the copolymerization third component in the acrylic rubber for crosslinking is based on active chlorine-containing monomer, carboxyl-containing. By monomers,
Epoxy group-containing monomer, 2-chloroethyl vinyl ether, or vinyl chloroacetate, and JIS-A hardness of 45
The present invention has been achieved by finding that the above object is achieved when the temperature is less than or equal to °. Hereinafter, the present invention will be described in more detail.
【０００７】本発明では、ＥＰＤＭとアクリルゴムをブ
レンドして用いるが、ＥＰＤＭとアクリルゴムを合わせ
て１００重量部とした場合、ＥＰＤＭとアクリルゴムの
配合比が９５重量部／５重量部〜５重量部／９５重量部
であり、好ましくは８０重量部／２０重量部〜２０重量
部／８０重量部であり、更に好ましくは７０重量部／３
０重量部〜３０重量部／７０重量部であることがより好
ましい。In the present invention, EPDM and acrylic rubber are blended and used. When EPDM and acrylic rubber are combined to 100 parts by weight, the compounding ratio of EPDM and acrylic rubber is 95 parts by weight / 5 parts by weight to 5 parts by weight. Parts / 95 parts by weight, preferably 80 parts by weight / 20 parts by weight to 20 parts by weight / 80 parts by weight, more preferably 70 parts by weight / 3.
It is more preferably 0 to 30 parts by weight / 70 parts by weight.
【０００８】アクリルゴムが５重量部より少ない（ＥＰ
ＤＭが９５重量部より多い）場合には、ＥＰＤＭの特性
に近い為に十分な低硬度を発現出来ない。アクリルゴム
が９５重量部より多い（ＥＰＤＭが５重量部より少な
い）場合には、アクリルゴムの粘着性の為に加工が非常
に困難となる。出来ればアクリルゴムは５０重量部程度
にとどめて使用することが、加工性或は粘着性を考慮す
ると好ましい。Less than 5 parts by weight of acrylic rubber (EP
If the DM is more than 95 parts by weight), sufficient low hardness cannot be expressed because it is close to the characteristics of EPDM. When the amount of acrylic rubber is more than 95 parts by weight (EPDM is less than 5 parts by weight), the processing becomes very difficult due to the adhesiveness of the acrylic rubber. If possible, it is preferable to use the acrylic rubber in an amount of about 50 parts by weight in view of processability or tackiness.
【０００９】なお本発明では、電子写真プロセス部材と
して用いられた場合に効果の高い低硬度組成物の定義と
してＪＩＳ−Ａ硬度で４５°以下とする。又、圧縮永久
歪みは３０％以下であることが好ましい。In the present invention, the JIS-A hardness is 45 ° or less as a definition of a low hardness composition which is highly effective when used as an electrophotographic process member. The compression set is preferably 30% or less.
【００１０】本発明に用いられるアクリルゴムについて
は、請求項２の如く、該アクリルゴムの主鎖が、化１及
び／又は化２で表せられるモノマー単位、例えば化１で
はメチルアクリレート、エチルアクリレート、ブチルア
クリレート等、化２ではメトキシエチルアクリレート、
エトキシエチルアクリレート等が挙げられ、又、請求項
３の如く、該アクリルゴム中に架橋に預かる共重合第３
成分が、活性塩素含有モノマーによるもの、カルボキシ
ル基含有モノマーによるもの、エポキシ基含有モノマー
によるもの、２−クロロエチルビニルエーテル、ビニル
クロロアセテート等によるもの等いずれのものでも特に
限定するものではないが、それぞれ単独でも組み合わせ
でも良く自由に用いることが出来る。Regarding the acrylic rubber used in the present invention, as in claim 2, the main chain of the acrylic rubber is a monomer unit represented by Chemical formula 1 and / or Chemical formula 2, for example, methyl acrylate, ethyl acrylate in Chemical formula 1, Butyl acrylate, etc.
Examples thereof include ethoxyethyl acrylate and the like. Further, as in claim 3, a copolymerizable third copolymer in the acrylic rubber.
The component is not particularly limited whether it is an active chlorine-containing monomer, a carboxyl group-containing monomer, an epoxy group-containing monomer, 2-chloroethyl vinyl ether, vinyl chloroacetate, or the like. They can be used alone or in combination and can be used freely.
【００１１】本発明に用いられるＥＰＤＭはエチレンと
プロピレンと第三成分とからなる三元重合体であり、上
記第三成分としては、特に制限されるものではないが、
ジシクロペンタジエン、エチリデンノルボルネン、１，
４−ヘキサジエン等が好適に用いられる。又、上記エチ
レン、プロピレン及び第三成分の割合は、特に制限され
るものではないが、エチレンの含有量が５〜９５重量
％、プロピレンの含有量が５〜９５重量％、第三成分の
含有量がヨウ素価で０〜５０とすることが好ましい。な
お、ヨウ素価の異なる２種以上のＥＰＤＭを混合して用
いることもできる。本発明で用いられるＥＰＤＭとして
は、重量平均分子量が２５万以上のものが好ましく、更
に好ましくは３０万以上のものである。The EPDM used in the present invention is a terpolymer composed of ethylene, propylene and a third component. The third component is not particularly limited,
Dicyclopentadiene, ethylidene norbornene, 1,
4-hexadiene and the like are preferably used. The ratio of ethylene, propylene and the third component is not particularly limited, but the content of ethylene is 5 to 95% by weight, the content of propylene is 5 to 95% by weight, the content of the third component is The iodine value is preferably 0 to 50. It should be noted that two or more kinds of EPDM having different iodine values can be mixed and used. The EPDM used in the present invention preferably has a weight average molecular weight of 250,000 or more, more preferably 300,000 or more.
【００１２】又、本発明に用いるＥＰＤＭは、加工性を
向上させる目的で油展しているものを用いることが出来
る。油展材料としては、石油系分溜油、松樹脂、コール
タール製品、天然油脂及びその誘導体、合成有機化合物
等が好適に用いられるが、感光体材料を汚染しにくいと
いう点から石油系のパラフィン油が最も好ましい。この
パラフィン油の重量平均分子量は５００以上が好まし
く、８００以上が更に好ましい。なお、油展材料の添加
量は、ＥＰＤＭ１００重量部に対して５〜１５０重量部
が好ましく、更には１０〜１００重量部が好ましい。The EPDM used in the present invention may be oil-extended for the purpose of improving workability. As the oil-extending material, petroleum-based fractionated oil, pine resin, coal tar products, natural fats and oils and their derivatives, synthetic organic compounds and the like are preferably used, but petroleum-based paraffin is preferable because it does not easily contaminate the photosensitive material. Oil is most preferred. The weight average molecular weight of this paraffin oil is preferably 500 or more, more preferably 800 or more. The amount of the oil-extended material added is preferably 5 to 150 parts by weight, more preferably 10 to 100 parts by weight, based on 100 parts by weight of EPDM.
【００１３】本発明のゴム組成物は、架橋してゴム状物
質とする為に架橋剤、加硫剤を添加することが出来、有
機過酸化物架橋、イオウ架橋、金属塩架橋等特に架橋系
に制限はない。いずれの場合でも架橋助剤、架橋促進
剤、架橋促進助剤、架橋遅延剤等を用いることが出来
る。上記以外にもゴムの配合剤として一般に用いられて
いる補強剤、充填剤、しゃく解剤、発泡剤、可塑剤、軟
化剤、粘着付与剤、分散剤、離型剤、増量剤、着色剤等
を添加することが出来る。The rubber composition of the present invention may be added with a crosslinking agent and a vulcanizing agent in order to form a rubber-like substance by crosslinking, and organic peroxide crosslinking, sulfur crosslinking, metal salt crosslinking and the like, especially crosslinking systems. There is no limit. In any case, a crosslinking aid, a crosslinking accelerator, a crosslinking accelerator, a crosslinking retarder, etc. can be used. In addition to the above, reinforcing agents, fillers, peptizers, foaming agents, plasticizers, softeners, tackifiers, dispersants, release agents, extenders, colorants, etc. that are commonly used as rubber compounding agents. Can be added.
【００１４】以下、実施例、比較例を示して、本発明を
説明するが実施例に限定されるものではない。又、産業
上の利用分野にしても、電子機器分野だけでなく、低硬
度、低圧縮永久歪み、高耐久の特徴を生かして、自動
車、建築、土木等幅広い分野に応用できることは言うま
でもない。The present invention will be described below with reference to examples and comparative examples, but the invention is not limited to the examples. Further, it goes without saying that the industrial application field can be applied not only to the field of electronic devices but also to a wide range of fields such as automobiles, construction, and civil engineering by taking advantage of the characteristics of low hardness, low compression set and high durability.
【００１５】[0015]
［実施例１］ＥＰＤＭ（日本合成ゴム（株）社製・ＥＰ
９８Ａ）５０重量部に対してアクリルゴム（日本合成ゴ
ム（株）社製・ＡＲＥＸ２１０：共重合第３成分が活性
塩素含有モノマー）５０重量部、シリカ１０重量部、酸
化チタン５重量部、ジクミルパーオキサイド２重量部を
ロールミルにて混合し、１６０℃に予熱した金型内で１
００ｋｇ／ｃｍ2 の圧力により３０分間成型し試験片を
作成した。ＪＩＳ−Ａ硬度は２７°、ＪＩＳ−Ｋ６３０
１による圧縮永久歪みは７．５％であった。[Example 1] EPDM (manufactured by Nippon Synthetic Rubber Co., Ltd., EP
98A) 50 parts by weight of acrylic rubber (manufactured by Nippon Synthetic Rubber Co., Ltd., AREX210: a copolymerization third component is an active chlorine-containing monomer) 50 parts by weight, silica 10 parts by weight, titanium oxide 5 parts by weight, dicumyl 2 parts by weight of peroxide were mixed with a roll mill, and 1 in a mold preheated to 160 ° C.
A test piece was prepared by molding for 30 minutes at a pressure of 00 kg / cm 2 . JIS-A hardness is 27 °, JIS-K630
The compression set according to No. 1 was 7.5%.
【００１６】［実施例２］ＥＰＤＭ７０重量部に対して
アクリルゴム３０重量部配合した他は実施例１と同様に
実施した。Example 2 Example 1 was repeated except that 30 parts by weight of acrylic rubber was added to 70 parts by weight of EPDM.
【００１７】［実施例３］実施例２と反対にＥＰＤＭ３
０重量部に対してアクリルゴム７０重量部を配合した他
は実施例１と同様に実施した。[Embodiment 3] Contrary to Embodiment 2, EPDM3
The same procedure as in Example 1 was carried out except that 70 parts by weight of acrylic rubber was added to 0 parts by weight.
【００１８】［比較例１］ＥＰＤＭ１００重量部にした
以外は実施例１と同様に実施した。上記実施例１、２、
３、及び比較例１、それぞれの配合及びその性能比較結
果を表１に示す。[Comparative Example 1] The same procedure as in Example 1 was carried out except that 100 parts by weight of EPDM was used. Examples 1 and 2 above
No. 3, and Comparative Example 1, the respective formulations and the performance comparison results thereof are shown in Table 1.
【００１９】[0019]
【表１】 [Table 1]
【００２０】[0020]
【発明の効果】本発明者等は、上記詳細の通り鋭意検討
を重ねた結果、請求項１の如く、ＥＰＤＭとアクリルゴ
ムからなるゴム組成物において、ＥＰＤＭとアクリルゴ
ムのブレンド比が９５重量部／５重量部〜５重量部／９
５重量部、好ましくはその配合比が８０重量部／２０重
量部〜２０重量部／８０重量部、更に好ましくは７０重
量部／３０重量部〜３０重量部の配合比からなるゴム組
成物を用い、請求項２に示すようなアクリルゴムを使用
し、特に請求項３及び４の如く、アクリルゴム中に請求
項４に示すような架橋に預かる共重合第３成分を有し、
更に請求項５に示す如くＥＰＤＭの第三成分含有量がヨ
ウ素価で０〜５０の場合において、例えば、複写機、プ
リンター等の電子写真装置、静電記録装置等にゴム部材
として用いた場合に低硬度でしかも耐久性に優れ、かつ
非汚染性を有するゴム組成物を提供すること。又、低硬
度で尚且圧縮永久歪みの小さいゴム組成物を提供するこ
とが可能となった。As a result of intensive studies as described above, the present inventors have found that, in the rubber composition comprising EPDM and acrylic rubber, the blending ratio of EPDM and acrylic rubber is 95 parts by weight. / 5 parts by weight to 5 parts by weight / 9
A rubber composition having a compounding ratio of 5 parts by weight, preferably 80 parts by weight / 20 parts by weight to 20 parts by weight / 80 parts by weight, more preferably 70 parts by weight / 30 parts by weight to 30 parts by weight is used. The acrylic rubber as claimed in claim 2 is used, and particularly, as in claims 3 and 4, the acrylic rubber has a copolymerization third component which is subjected to crosslinking as claimed in claim 4,
Further, when the content of the third component of EPDM is 0 to 50 in iodine value as described in claim 5, for example, when it is used as a rubber member in an electrophotographic device such as a copying machine or a printer, an electrostatic recording device or the like. To provide a rubber composition having low hardness, excellent durability, and non-staining property. Further, it has become possible to provide a rubber composition having a low hardness and a small compression set.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−59650（ＪＰ，Ａ) 特開 昭62−143953（ＪＰ，Ａ) 特開 昭64−69647（ＪＰ，Ａ) 特開 昭60−177044（ＪＰ，Ａ) 特開 平７−292178（ＪＰ，Ａ) 特公 昭59−33140（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) C08L 1/00 - 101/16 C08J 3/24 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 62-59650 (JP, A) JP 62-143953 (JP, A) JP 64-69647 (JP, A) JP 60- 177044 (JP, A) JP 7-292178 (JP, A) JP 59-33140 (JP, B1) (58) Fields investigated (Int.Cl. 7 , DB name) C08L 1/00-101 / 16 C08J 3/24
Claims (3)
合体（ＥＰＤＭ）とアクリルゴムからなる電子写真プロ
セス部材用ゴム組成物において、ＥＰＤＭとアクリルゴ
ムの配合比が９５重量部／５重量部〜５重量部／９５重
量部であり、前記アクリルゴム中に架橋に預かる共重合
第３成分が、活性塩素含有モノマーによるもの、カルボ
キシル含有モノマーによるもの、エポキシ基含有モノマ
ーによるもの、２−クロロエチルビニルエーテルによる
もの、または、ビニルクロロアセテートによるものであ
り、かつ、ＪＩＳ−Ａ硬度で４５°以下であることを特
徴とする電子写真プロセス部材用ゴム組成物。1. A rubber composition for an electrophotographic process member, comprising an ethylene-propylene-diene terpolymer (EPDM) and acrylic rubber, wherein the compounding ratio of EPDM and acrylic rubber is 95 parts by weight to 5 parts by weight. Ri parts / 95 parts by weight der copolymerization will be involved in crosslinking the acrylic rubber
The third component is a monomer containing active chlorine,
With xyl-containing monomer, epoxy group-containing monomer
-By 2-chloroethyl vinyl ether
Or with vinyl chloroacetate
Ri, and an electrophotographic process element for the rubber composition characterized der Rukoto 45 ° or less in JIS-A hardness.
は化２で表せられるモノマー単位からなることを特徴と
する請求項１記載の電子写真プロセス部材用ゴム組成
物。 【化１】 【化２】 2. The rubber composition for an electrophotographic process member according to claim 1, wherein the main chain of the acrylic rubber comprises a monomer unit represented by the following chemical formula 1 and / or chemical formula 2. [Chemical 1] [Chemical 2]
で０〜５０であることを特徴とする請求項１記載の電子
写真プロセス部材用ゴム組成物。3. The rubber composition for electrophotographic process members according to claim 1, wherein the content of the third component of EPDM is from 0 to 50 in terms of iodine value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21305594A JP3506272B2 (en) | 1994-09-06 | 1994-09-06 | Rubber composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21305594A JP3506272B2 (en) | 1994-09-06 | 1994-09-06 | Rubber composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0873680A JPH0873680A (en) | 1996-03-19 |
| JP3506272B2 true JP3506272B2 (en) | 2004-03-15 |
Family
ID=16632788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21305594A Expired - Fee Related JP3506272B2 (en) | 1994-09-06 | 1994-09-06 | Rubber composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3506272B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1149870A4 (en) * | 1998-08-20 | 2004-12-08 | Kaneka Corp | Composition for roller and roller therefrom |
| JP4554836B2 (en) * | 2001-02-27 | 2010-09-29 | 株式会社クラレ | Rubber composition |
-
1994
- 1994-09-06 JP JP21305594A patent/JP3506272B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0873680A (en) | 1996-03-19 |
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