JP4032233B2 - Release agent composition for fixing and fixing method - Google Patents
Release agent composition for fixing and fixing method Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、電子写真式複写機やプリンター等の画像形成装置において、転写材上に転写した未定着トナー像を定着する際に使用する定着用離型剤組成物及び定着方法に関する。
【０００２】
【従来の技術】
従来、電子写真式複写機やプリンター等の画像形成装置において採用されている定着装置は、トナーのオフセット防止用の離型剤を定着ロール又はベルト等の定着用部材表面に供給する手段が設けられているものが一般的であり、その離型剤としてはジメチルシリコーンオイル、メチルフェニルシリコーンオイル、メルカプト変性シリコーンオイルが使用されてきた。しかし、ジメチルシリコーンオイルは定着ロール表面との親和性が乏しいためロール表面に均一な被膜を形成しづらく、メチルフェニルシリコーンオイルは表面張力が高く離型性に乏しく、メルカプト変性シリコーンオイルは定着時の熱により定着用部材表面で架橋して粘着性の物質に変化することがあり、いずれも離型性、耐久性を十分満足するものではなかった。
【０００３】
これを改良するものとして、特許２９００６３７号公報では、粘度が１０〜１０，０００ｍｍ2／ｓのアミノ変性シリコーンオイルを離型剤とする方法が提案され、それなりに効果を上げているが、最近のカラー複写機，プリンターにおいては、より高光沢な画像を得るためにトナーを十分溶融させることが必要となってきており、益々剥離が困難な方向にあるため、それでもまだ効果は完全とは言えなくなってきている。
【０００４】
【特許文献１】
特許２９００６３７号公報
【０００５】
【発明が解決しようとする課題】
本発明は上記事情に鑑みなされたもので、上記従来の定着装置に用いられてきた離型剤の欠点を改良し、より離型性、耐久性の向上した定着用離型剤組成物及び定着方法を提供することを目的とする。
【０００６】
【課題を解決するための手段及び発明の実施の形態】
本発明者は、上記目的を達成するため鋭意検討した結果、定着用ロール又はベルト等の定着用部材と、該定着用部材表面への離型剤供給手段を備えた定着装置において使用する離型剤として、下記一般式（１）のアミノ変性ポリシロキサンと、下記一般式（２）のオルガノポリシロキサンとを特定の割合で混合した特定の粘度のものを含有する組成物を用いることで、上記目的を達成できることをを知見し、本発明をなすに至ったものである。
【０００７】
即ち、本発明は、下記一般式（１）で表されるアミノ変性ポリシロキサンと、下記一般式（２）で表されるオルガノポリシロキサンとを、アミノ変性ポリシロキサン：オルガノポリシロキサン（重量比）＝０．５：９９．５〜５０：５０の割合で混合してなり、２５℃における粘度が５０〜５０，０００ｍｍ2／ｓである混合物を含有することを特徴とする定着用離型剤組成物、及び
離型剤が供給された定着用部材に未定着トナー像を担持した転写媒体を通過させ、未定着トナー像を転写媒体に定着させる定着方法において、上記離型剤として上記離型剤組成物を用いることを特徴とする定着方法を提供する。
【化３】
【化４】
【０００８】
以下、本発明につきさらに詳しく説明する。
本発明の定着用離型剤組成物は、下記一般式（１）のアミノ変性ポリシロキサンと下記一般式（２）のオルガノポリシロキサンとの混合物を主成分とする。
【０００９】
【化５】
上記式において、Ｒ1は互いに同一又は異種の炭素数１〜１０、好ましくは１〜８の１価炭化水素基である。炭素数１〜１０の１価炭化水素基としては、メチル基、エチル基、プロピル基、ブチル基、ヘキシル基、デシル基等のアルキル基、シクロヘキシル基等のシクロアルキル基、フェニル基、トリル基等のアリール基、ベンジル基等のアラルキル基等が挙げられ、これらの中でもメチル基が好ましく、特に式（１）、（２）共全てのＲ1がメチル基であることが好ましい。
【００１１】
Ａは−Ｒ2−（ＮＨ−Ｒ3）k−ＮＨ2（ただし、Ｒ2は炭素数１〜１０の２価炭化水素基、Ｒ3は炭素数２〜１０の２価炭化水素基、ｋは０〜３の整数。）で示されるアミノ基含有基である。Ｒ2は炭素数１〜１０、特に３〜６の２価炭化水素基であり、例えばメチレン基、エチレン基、プロピレン基、ブチレン基、へキシレン基、オクチレン基等のアルキレン基、シクロヘキシレン基等のシクロアルキレン基、フェニレン基等のアリーレン基等を挙げることができ、特にプロピレン基が好ましい。
【００１２】
Ｒ3は炭素数２〜１０の２価炭化水素基であり、エチレン基、プロピレン基、ブチレン基、へキシレン基、オクチレン基等のアルキレン基、シクロヘキシレン基等のシクロアルキレン基、フェニレン基等のアリーレン基等を挙げることができ、特にエチレン基が好ましい。ｋは０〜３の整数あり、０又は１が好ましい。
【００１３】
Ａの好ましい例としては、−Ｃ3Ｈ6−ＮＨ2、−Ｃ3Ｈ6−ＮＨ−Ｃ2Ｈ4−ＮＨ2、−Ｃ3Ｈ6−（ＮＨ−Ｃ2Ｈ4）2−ＮＨ2、−Ｃ3Ｈ6−（ＮＨ−Ｃ2Ｈ4）3−ＮＨ2等が挙げられる。
【００１４】
ＢはＡ、Ｒ1又は水酸基であり、特に、離型性や製造のし易さ及び価格の点から、Ｂ全てがメチル基のものが特に好ましい。ｎは２，５００以上の整数、より好ましくは３，０００以上の整数である。その上限は特に制限されるものではないが、通常３０，０００以下、特に１０，０００以下であることが好ましい。ｍは０〜１００の整数、より好ましくは０〜５０の整数であるが、ＢがＡでないときは１〜１００の整数であり、より好ましくは１〜５０の整数である。
【００１５】
また、式（２）において、Ｌは３０〜１，０００の整数、好ましくは５０〜５００の整数である。
【００１６】
本発明の一般式（１）で表されるアミノ変性高重合ポリシロキサン化合物は高分子量であるため、定着用部材表面に連続被膜を作りやすく、離型性、耐久性に優れるものとなるが、このアミノ変性高重合ポリシロキサン化合物は、室温では殆ど流動性を示さないガム状物質であり、単独では定着用部材表面に連続的に供給することが困難であるため、一般式（２）で表されるオルガノポリシロキサン化合物と混合して粘度を調整することが必要である。その混合割合は、一般式（１）で表されるアミノ変性高重合ポリシロキサン：一般式（２）で表されるオルガノポリシロキサン（重量比）が、０．５：９９．５〜５０：５０、好ましくは、１：９９〜２０：８０である。一般式（１）で表されるアミノ変性高重合ポリシロキサンの割合が０．５未満では離型性、耐久性が不足し、５０を超えると混合物の粘度が高くなりすぎて離型剤の供給が困難となる。また、混合物の２５℃における粘度は５０〜５０，０００ｍｍ2／ｓ、好ましくは１００〜１０，０００ｍｍ2／ｓである。
【００１７】
本発明の定着用離型剤組成物は、電気接点障害等のシリコーントラブルを防止する目的で低分子シロキサンを除去したものであることが好ましい。ここで低分子シロキサンとは、ケイ素原子数が２０以下の環状又は直鎖状シロキサンのことであり、これらの総量が１０，０００ｐｐｍ以下、好ましくは３，０００ｐｐｍ以下であればよい。低分子シロキサンの除去方法は、窒素置換高温減圧ストリッピングによる公知の方法で行えばよく、これは混合前の各シロキサンの段階で行っても混合後に行ってもよい。
【００１８】
本発明の定着用離型剤組成物には、上記混合物の他に、本発明の目的を損なわない範囲で、さらに必要に応じて２，６−ジ−ｔｅｒｔ−ブチル−ｐ−クレゾール（ＢＨＴ）、ｄｌ−α−トコフェロール、ブチルヒドロキシアニソール等の公知の酸化防止剤、芳香族アミノ変性オルガノポリシロキサン等の公知の耐熱向上剤等を添加してもよい。
【００１９】
本発明の定着方法は、上記した定着用離型剤組成物を定着装置の離型剤として使用すればよく、この定着装置としては定着用ロール又は定着用ベルト等の定着用部材と、定着用部材表面への離型剤供給手段を備えたものであれば特に制限はなく、離型剤供給手段も、オイルパンに入れた離型剤を塗布ロールによって定着用部材表面に塗布する方法、離型剤含浸のウェブ等で定着部材表面に塗布する方法等、特に制限はない。
【００２０】
本発明の定着方法は、このような定着装置を用いて行うことができ、離型剤が供給された定着用ロール、定着用ベルト等の定着用部材に未定着トナー像を担持した紙等の転写媒体を通過させて未定着トナー像を転写媒体に定着させるという公知の定着方法を採用して行うことができるが、本発明はかかる定着方法を上記離型剤組成物を用いて行うものである。
【００２１】
【実施例】
以下、実施例及び比較例を示し、本発明を具体的に説明するが、本発明は下記の実施例に制限されるものではない。なお、下記の例において部は重量部を示す。
【００２２】
［実施例１〜５、比較例１，２］
表１に示す配合でアミノ変性高重合ポリシロキサン化合物とオルガノポリシロキサン化合物を混合し、定着用離型剤組成物を得た。
次に、この離型剤の評価を下記の方法で行った。
評価方法：
シリコーンゴムを表層材料とする定着ロールとそれに対向する加圧ロール、及び得られた離型剤組成物を含浸させたアラミド樹脂系ウェブを備えた定着装置を作製した。(株)沖データ製カラーレーザープリンターで普通紙Ａ４サイズに印刷した画像を定着し、オフセット発生までの枚数で評価した。試験は最大５万枚までとした。実施例１〜５の離型剤組成物の結果を表１に併記する。いずれも５万枚までオフセットが発生せず、良好な離型性、耐久性を示した。
【００２３】
また、比較の離型剤組成物として下記式（６）又は（７）で表されるアミノ変性ポリシロキサン化合物を用いて同様な試験を行った。結果を表２に示す。実施例に比較して性能は劣っていた。
【００２４】
【表１】
【化６】
【表２】
【化７】
本発明の定着用離型剤組成物は、アミノ変性高重合ポリシロキサン化合物が定着用部材表面に連続被膜を作りやすいため、離型性、耐久性に優れ、低粘度のオルガノポリシロキサンで希釈してあるため、定着部材への供給が簡単であるという特徴を有しており、また、これを用いた定着方法によればオフセットのない定着画像が得られる。
【００２９】
【発明の効果】
本発明の定着用離型剤組成物によれば、より離型性、耐久性の向上した定着用離型剤組成物が得られ、この組成物を用いた定着方法を提供することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fixing release agent composition and fixing method used when fixing an unfixed toner image transferred onto a transfer material in an image forming apparatus such as an electrophotographic copying machine or a printer.
[0002]
[Prior art]
Conventionally, a fixing device employed in an image forming apparatus such as an electrophotographic copying machine or a printer is provided with means for supplying a release agent for preventing toner offset to the surface of a fixing member such as a fixing roll or a belt. In general, dimethyl silicone oil, methylphenyl silicone oil, and mercapto-modified silicone oil have been used as the release agent. However, dimethyl silicone oil has poor affinity with the surface of the fixing roll, so it is difficult to form a uniform film on the surface of the roll. Methyl phenyl silicone oil has high surface tension and poor releasability. The surface of the fixing member may be cross-linked by heat to change to a sticky substance, and none of them sufficiently satisfies the releasability and durability.
[0003]
In order to improve this, Japanese Patent No. 2900637 proposes a method in which an amino-modified silicone oil having a viscosity of 10 to 10,000 mm 2 / s is used as a release agent, which is effective as such. In color copiers and printers, it is necessary to melt the toner sufficiently to obtain a higher gloss image, and it is becoming more difficult to peel off. It is coming.
[0004]
[Patent Document 1]
Japanese Patent No. 2900637
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and has improved the defects of the release agent used in the above-described conventional fixing device, and has improved release properties and durability, and a fixing release agent composition and fixing. It aims to provide a method.
[0006]
Means for Solving the Problem and Embodiment of the Invention
As a result of intensive studies to achieve the above object, the present inventor has found that a release member used in a fixing device having a fixing member such as a fixing roll or a belt and a releasing agent supply means to the surface of the fixing member. By using a composition containing an amino-modified polysiloxane represented by the following general formula (1) and an organopolysiloxane represented by the following general formula (2) at a specific ratio as the agent: It has been found that the object can be achieved, and the present invention has been made.
[0007]
That is, the present invention provides an amino-modified polysiloxane represented by the following general formula (1) and an organopolysiloxane represented by the following general formula (2): amino-modified polysiloxane: organopolysiloxane (weight ratio). = 0.5: 99.5 to 50:50 The composition is mixed at a ratio of 0.5: 99.5 to 50:50, and contains a mixture having a viscosity at 25 ° C. of 50 to 50,000 mm 2 / s. In a fixing method in which a transfer medium carrying an unfixed toner image is passed through a fixing member supplied with a toner and a release agent, and the unfixed toner image is fixed on the transfer medium, the release agent is used as the release agent. A fixing method characterized by using a composition is provided.
[Chemical 3]
[Formula 4]
[0008]
Hereinafter, the present invention will be described in more detail.
The fixing release agent composition of the present invention is mainly composed of a mixture of an amino-modified polysiloxane of the following general formula (1) and an organopolysiloxane of the following general formula (2).
[0009]
[Chemical formula 5]
In the above formula, R 1 is a monovalent hydrocarbon group having the same or different carbon number of 1 to 10, preferably 1 to 8. Examples of the monovalent hydrocarbon group having 1 to 10 carbon atoms include an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, and a decyl group, a cycloalkyl group such as a cyclohexyl group, a phenyl group, and a tolyl group. And aryl groups such as benzyl group, and the like. Among these, a methyl group is preferable, and it is particularly preferable that all R 1 in both formulas (1) and (2) are methyl groups.
[0011]
A is —R 2 — (NH—R 3 ) k —NH 2 (wherein R 2 is a divalent hydrocarbon group having 1 to 10 carbon atoms, R 3 is a divalent hydrocarbon group having 2 to 10 carbon atoms, k Is an integer of 0 to 3). R 2 is a divalent hydrocarbon group having 1 to 10 carbon atoms, particularly 3 to 6 carbon atoms, such as alkylene groups such as methylene group, ethylene group, propylene group, butylene group, hexylene group, octylene group, cyclohexylene group, etc. And arylene groups such as a cycloalkylene group and a phenylene group, and a propylene group is particularly preferable.
[0012]
R 3 is a divalent hydrocarbon group having 2 to 10 carbon atoms, such as an ethylene group, a propylene group, a butylene group, a hexylene group, an alkylene group such as an octylene group, a cycloalkylene group such as a cyclohexylene group, a phenylene group, etc. An arylene group can be exemplified, and an ethylene group is particularly preferable. k is an integer of 0 to 3, and 0 or 1 is preferable.
[0013]
Preferred examples of A include —C 3 H 6 —NH 2 , —C 3 H 6 —NH—C 2 H 4 —NH 2 , —C 3 H 6 — (NH—C 2 H 4 ) 2 —NH 2. , —C 3 H 6 — (NH—C 2 H 4 ) 3 —NH 2 and the like.
[0014]
B is A, R 1 or a hydroxyl group, and in particular, all of B are methyl groups from the viewpoint of releasability, ease of production and price. n is an integer of 2,500 or more, more preferably an integer of 3,000 or more. The upper limit is not particularly limited, but it is usually preferably 30,000 or less, particularly preferably 10,000 or less. m is an integer of 0-100, more preferably an integer of 0-50, but when B is not A, it is an integer of 1-100, more preferably an integer of 1-50.
[0015]
Moreover, in Formula (2), L is an integer of 30-1,000, Preferably it is an integer of 50-500.
[0016]
Since the amino-modified highly-polymerized polysiloxane compound represented by the general formula (1) of the present invention has a high molecular weight, it is easy to form a continuous film on the surface of the fixing member, and is excellent in releasability and durability. This amino-modified highly-polymerized polysiloxane compound is a gum-like substance that hardly exhibits fluidity at room temperature, and it is difficult to continuously supply it to the surface of the fixing member by itself. It is necessary to adjust the viscosity by mixing with the organopolysiloxane compound. The mixing ratio of the amino-modified highly polymerized polysiloxane represented by the general formula (1): the organopolysiloxane represented by the general formula (2) (weight ratio) is 0.5: 99.5 to 50:50. Preferably, it is 1: 99-20: 80. If the ratio of the amino-modified highly-polymerized polysiloxane represented by the general formula (1) is less than 0.5, the releasability and durability are insufficient, and if it exceeds 50, the viscosity of the mixture becomes too high and the release agent is supplied. It becomes difficult. The viscosity of the mixture at 25 ° C. is 50 to 50,000 mm 2 / s, preferably 100 to 10,000 mm 2 / s.
[0017]
The release agent composition for fixing of the present invention is preferably obtained by removing low molecular weight siloxane for the purpose of preventing silicone trouble such as electric contact failure. Here, the low molecular weight siloxane is a cyclic or linear siloxane having 20 or less silicon atoms, and the total amount thereof may be 10,000 ppm or less, preferably 3,000 ppm or less. The low molecular siloxane may be removed by a known method by nitrogen substitution high temperature vacuum stripping, which may be performed at each siloxane stage before mixing or after mixing.
[0018]
The fixing release agent composition of the present invention includes, in addition to the above mixture, 2,6-di-tert-butyl-p-cresol (BHT) as necessary, as long as the object of the present invention is not impaired. , Known antioxidants such as dl-α-tocopherol and butylhydroxyanisole, and known heat resistance improvers such as aromatic amino-modified organopolysiloxane may be added.
[0019]
In the fixing method of the present invention, the above-described fixing release agent composition may be used as a release agent for a fixing device. As the fixing device, a fixing member such as a fixing roll or a fixing belt, and a fixing member are used. The release agent supply means is not particularly limited as long as it has a release agent supply means on the surface of the member. The release agent supply means also applies a release agent placed in an oil pan to the surface of the fixing member using an application roll, There is no particular limitation on the method of applying the surface of the fixing member with a mold-impregnated web or the like.
[0020]
The fixing method of the present invention can be carried out using such a fixing device, such as a fixing roll supplied with a releasing agent, a paper carrying an unfixed toner image on a fixing member such as a fixing belt, and the like. Although a known fixing method of fixing an unfixed toner image to the transfer medium by passing through the transfer medium can be employed, the present invention performs such a fixing method using the above releasing agent composition. is there.
[0021]
【Example】
EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example. In the following examples, parts indicate parts by weight.
[0022]
[Examples 1 to 5, Comparative Examples 1 and 2]
An amino-modified highly polymerized polysiloxane compound and an organopolysiloxane compound were mixed in the formulation shown in Table 1 to obtain a fixing release agent composition.
Next, the release agent was evaluated by the following method.
Evaluation methods:
A fixing device including a fixing roll using silicone rubber as a surface layer material, a pressure roll facing the fixing roll, and an aramid resin web impregnated with the obtained release agent composition was produced. Images printed on plain paper A4 size were fixed with a color laser printer manufactured by Oki Data Co., Ltd. and evaluated by the number of sheets until the occurrence of offset. The maximum number of tests was 50,000. The results of the release agent compositions of Examples 1 to 5 are also shown in Table 1. In all cases, no offset occurred up to 50,000 sheets, and good release properties and durability were exhibited.
[0023]
Moreover, the same test was done using the amino modified polysiloxane compound represented by following formula (6) or (7) as a comparative mold release agent composition. The results are shown in Table 2. The performance was inferior to the examples.
[0024]
[Table 1]
[Chemical 6]
[Table 2]
[Chemical 7]
In the fixing release agent composition of the present invention, the amino-modified highly polymerized polysiloxane compound is easy to form a continuous film on the surface of the fixing member, so that it is excellent in releasability and durability and diluted with a low-viscosity organopolysiloxane. Therefore, it has a feature that it can be easily supplied to the fixing member, and a fixing image without offset can be obtained by a fixing method using the fixing member.
[0029]
【The invention's effect】
According to the fixing release agent composition of the present invention, it is possible to obtain a fixing release agent composition with further improved releasability and durability, and to provide a fixing method using this composition.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002275002A JP4032233B2 (en) | 2002-09-20 | 2002-09-20 | Release agent composition for fixing and fixing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002275002A JP4032233B2 (en) | 2002-09-20 | 2002-09-20 | Release agent composition for fixing and fixing method |
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| Publication Number | Publication Date |
|---|---|
| JP2004109789A JP2004109789A (en) | 2004-04-08 |
| JP4032233B2 true JP4032233B2 (en) | 2008-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2002275002A Expired - Fee Related JP4032233B2 (en) | 2002-09-20 | 2002-09-20 | Release agent composition for fixing and fixing method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4834378B2 (en) * | 2005-10-31 | 2011-12-14 | 株式会社リコー | Fixing method, image forming method, fixing device, and image forming apparatus |
| JP6213313B2 (en) * | 2014-03-07 | 2017-10-18 | 株式会社リコー | Fixing device and image forming apparatus having the same |
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2002
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Also Published As
| Publication number | Publication date |
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| JP2004109789A (en) | 2004-04-08 |
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