JPH03242656A - White developer - Google Patents
White developerInfo
- Publication number
- JPH03242656A JPH03242656A JP2040187A JP4018790A JPH03242656A JP H03242656 A JPH03242656 A JP H03242656A JP 2040187 A JP2040187 A JP 2040187A JP 4018790 A JP4018790 A JP 4018790A JP H03242656 A JPH03242656 A JP H03242656A
- Authority
- JP
- Japan
- Prior art keywords
- white
- toner
- carrier
- developer
- latent image
- 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
Links
- 229920005989 resin Polymers 0.000 claims abstract description 27
- 239000011347 resin Substances 0.000 claims abstract description 27
- 239000011248 coating agent Substances 0.000 claims abstract description 25
- 238000000576 coating method Methods 0.000 claims abstract description 25
- 239000012463 white pigment Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 6
- 238000002156 mixing Methods 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 6
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 abstract description 6
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 5
- 230000002209 hydrophobic effect Effects 0.000 abstract description 3
- 238000004898 kneading Methods 0.000 abstract description 3
- 150000003242 quaternary ammonium salts Chemical class 0.000 abstract description 3
- 239000000377 silicon dioxide Substances 0.000 abstract description 3
- 238000010298 pulverizing process Methods 0.000 abstract description 2
- 230000006866 deterioration Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 229920001909 styrene-acrylic polymer Polymers 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 108091008695 photoreceptors Proteins 0.000 description 7
- 230000032683 aging Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 239000003086 colorant Substances 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000012756 surface treatment agent Substances 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
Landscapes
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、乾式２威分現像方式の複写機等の電子写真装
置に供される白色現像剤に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a white developer used in an electrophotographic apparatus such as a copying machine using a dry two-part development method.
電子写真装置としての複写機では、従来、電子写真装置
の感光体に形成された静電潜像を現像するトナーと、こ
のトナーを搬送するためのキャリアとからなる２成分系
の電子写真用現像剤（以下現像剤と称する）が多用され
ている。Copying machines as electrophotographic devices have conventionally used a two-component electrophotographic developer consisting of a toner for developing an electrostatic latent image formed on a photoreceptor of the electrophotographic device and a carrier for transporting this toner. A developer (hereinafter referred to as a developer) is frequently used.
また、近年、電子写真装置の感光体に形成された静電潜
像を白色に現像する現像剤として、白色現像剤が使用さ
ている。Further, in recent years, a white developer has been used as a developer for developing an electrostatic latent image formed on a photoreceptor of an electrophotographic apparatus into a white color.
上記白色現像剤は、トナーに色彩を付与するための着色
剤として、酸化チタン等の白色顔料を用い、且つトナー
に帯電性を付与するための帯電制御剤として、４級アン
モニウム塩等の無色透明の帯電制御剤を用いて作製され
た白色トナーと、フェライトもしくは鉄粉に、フッ素樹
脂等のコーティング樹脂をコーティングして作製された
キャリアとから構成されている。The above white developer uses a white pigment such as titanium oxide as a coloring agent to impart color to the toner, and a colorless transparent material such as a quaternary ammonium salt as a charge control agent to impart chargeability to the toner. The toner is composed of a white toner made using a charge control agent, and a carrier made by coating ferrite or iron powder with a coating resin such as fluororesin.
ところが、上記従来の白色現像剤は、感光体に形成され
た静電潜像を現像する際、白色トナーが、キャリアのコ
ーティング樹脂を剥がし、コーティング樹脂が、白色ト
ナーと共に静電潜像に付着される。このため、現像され
た静電潜像の色にコーティング樹脂の占れが現れ、白色
トナーを使用しているにも係わらず、黄ばんだような色
になるという問題を有している。However, when the conventional white developer described above develops the electrostatic latent image formed on the photoreceptor, the white toner peels off the coating resin of the carrier, and the coating resin is attached to the electrostatic latent image together with the white toner. Ru. Therefore, there is a problem in that the color of the developed electrostatic latent image is affected by the coating resin, resulting in a yellowish color even though white toner is used.
本発明に係る白色現像剤は、上記課題を解決するために
、感光体に形成された静電潜像を白色に現像する白色ト
ナーと、コーティング樹脂を外周の表面にコーティング
して、上記白色トナーを搬送するキャリアとの？捏合物
を備えた白色現像剤において、以下の手段を講している
。In order to solve the above problems, the white developer according to the present invention includes a white toner that develops an electrostatic latent image formed on a photoconductor into a white color, and a coating resin coated on the outer peripheral surface of the white toner. With a carrier to transport? The following measures have been taken for the white developer equipped with a kneaded material.
即ち、上記キャリアのコーティング樹脂に、白色顔料が
添加されている。That is, a white pigment is added to the coating resin of the carrier.
〔作 用］
上記の構成によれば、感光体に形成された静電潜像を現
像する際、白色トナーがキャリアのコーティング樹脂を
剥がし、コーティング樹脂が、白色トナーと共に静電潜
像に付着した場合でも、コーティング樹脂に白色顔料が
添加されているため、静電潜像には純粋な白色が現像さ
れる。[Function] According to the above configuration, when developing the electrostatic latent image formed on the photoreceptor, the white toner peels off the coating resin of the carrier, and the coating resin adheres to the electrostatic latent image together with the white toner. Even in this case, since a white pigment is added to the coating resin, a pure white color is developed in the electrostatic latent image.
〔実施例］ 本発明の一実施例を以下に説明する。〔Example] An embodiment of the present invention will be described below.
本発明に係る白色現像剤は、電子写真装置の感光体に形
成された静電潜像を白色に現像する白色トナーと、外周
の表面のコーティング樹脂に白色顔料を添加して、上記
白色トナーを搬送するキャリア（以下白色キャリアと称
する）とから構成されている。The white developer according to the present invention includes a white toner that develops an electrostatic latent image formed on a photoreceptor of an electrophotographic device into a white color, and a white pigment added to a coating resin on the outer surface of the electrophotographic device. It is composed of a carrier (hereinafter referred to as a white carrier) to be transported.
上記白色キャリアは、白色顔料を添加したコーティング
樹脂を、フェライトあるいは鉄粉にコーティングするこ
とにより製造される。The white carrier is produced by coating ferrite or iron powder with a coating resin containing a white pigment.
上記の白色顔料としては、例えば酸化チタン、硫酸バリ
ウム、酸化亜鉛、および硫酸亜鉛等の単体、若しくは、
これら単体を２種類以上組み合わせた混合物を用いるこ
とができる。Examples of the above white pigment include simple substances such as titanium oxide, barium sulfate, zinc oxide, and zinc sulfate, or
A mixture of two or more of these single substances can be used.
また、コーティング樹脂としては、例えばフッ素樹脂、
アクリル樹脂、スチレン・アクリル共重合樹脂、シリコ
ン樹脂、ポリエステル樹脂、およびポリブタジェン樹脂
等を用いることができる。In addition, examples of coating resin include fluororesin,
Acrylic resin, styrene/acrylic copolymer resin, silicone resin, polyester resin, polybutadiene resin, etc. can be used.
尚、白色キャリアを構成する各材料の組み合わせは限定
するものではなく、また、各材料は上述の材料に限定さ
れることなく、他種類の材料であっても使用することが
できる。Note that the combination of materials constituting the white carrier is not limited, and each material is not limited to the above-mentioned materials, and other types of materials can also be used.
上記の白色トナーは、白色トナーを構成する各材料を一
体化すると共に、着色剤を転写紙上に定着させるための
結着樹脂剤と、白色トナーに白色を付与するための白色
顔料としての着色剤と、白色トナーに帯電性を付与する
ための透明な帯電制御剤と、電子写真装置に内蔵された
定着ローラ、感光体、および転写中間体等への白色トナ
ーの付着を防止するための離型剤と、白色トナーに流動
性を付与する表面処理剤とからなる。上記の結着樹脂剤
としてはスチレン・アクリル系樹脂（以下Ｓ ｔ ／
Ａ ｃ系樹脂と称する）、着色剤としては酸化チタン、
帯電制御剤としては４級アンモニウム塩、離型剤として
は低分子ポリエチレンワックス（以下低分子ＰＥワック
スと称する）、表面処理剤としては疏水性シリカがそれ
ぞれ使用されている。そして、これら各材料は、第１表
に示す配合比率にて白色トナーに含有されている。The above-mentioned white toner is made by integrating the various materials that make up the white toner, as well as a binder resin agent for fixing the colorant onto the transfer paper, and a colorant as a white pigment for imparting white color to the white toner. , a transparent charge control agent to impart chargeability to the white toner, and a mold release agent to prevent the white toner from adhering to the fixing roller, photoreceptor, transfer intermediate, etc. built into the electrophotographic device. and a surface treatment agent that imparts fluidity to the white toner. As the binder resin mentioned above, styrene/acrylic resin (hereinafter referred to as S t /
(referred to as A c-based resin), titanium oxide as a coloring agent,
A quaternary ammonium salt is used as a charge control agent, a low-molecular polyethylene wax (hereinafter referred to as low-molecular PE wax) is used as a mold release agent, and hydrophobic silica is used as a surface treatment agent. Each of these materials is contained in the white toner at the mixing ratio shown in Table 1.
第 ｌ 表
上記の構成において、本白色現像剤の製造方法を以下に
説明する。Table 1 A method for producing the present white developer having the above structure will be described below.
上記の第１表の成分から成る白色トナーは、混合→混練
→粉砕→分級の工程を経て製造される。The white toner made of the components shown in Table 1 above is produced through the steps of mixing, kneading, pulverizing, and classifying.
即ち、先ず、各材料をミキサーで混合し、雇合工程によ
って得られた混合物を熱ロールミルで溶融して混練し、
一体化した。その後、混練工程にて一体化された混練物
を粒子状に粉砕し、得られた粒子を分級することにより
、粒径約１０μｍの白色の粒子を得た。そして、これら
の粒子に０．１重量部の疎水シリカを加えて混合し、白
色トナーを得た。That is, first, each material is mixed with a mixer, and the mixture obtained by the mixing process is melted and kneaded with a hot roll mill.
Integrated. Thereafter, the kneaded material integrated in the kneading step was pulverized into particles, and the obtained particles were classified to obtain white particles with a particle size of about 10 μm. Then, 0.1 part by weight of hydrophobic silica was added to these particles and mixed to obtain a white toner.
また、白色キャリアは、白色顔料としての酸化チタンを
コーティング樹脂としてのフッ素樹脂に添加した後、こ
れをフェライトの表面にコーティングすることにより作
製した。Moreover, the white carrier was produced by adding titanium oxide as a white pigment to a fluororesin as a coating resin, and then coating the surface of the ferrite with this.
そして、本実施例の白色現像剤は、上記のようにして得
られた、白色トナー／４重量部と、白色キャリア／１０
０重量部とを混合することにより調整した。The white developer of this example was composed of 4 parts by weight of white toner obtained as described above and 10 parts by weight of white carrier.
It was adjusted by mixing 0 parts by weight.
また、白色顔料を添加していないフッ素樹脂を、フェラ
イトにコーティングしたキャリアと、白色トナーとを混
合して、従来例の白色現像剤を調整した。そして、上記
従来例の白色現像剤と、本実施例の白色現像剤とを使用
し、複写機（シャープ■製、５Ｆ−８４００）にて、５
００枚、１，０００枚、および５，０００枚毎のエージ
ング（Ａｇｉｎｇ）による白色度の変化を調べたところ
、第２表に示す結果が得られた。尚、白色度の測定は、
普通紙に直径４ｏの白へ夕を複写し、日本重色工業社製
のＺ−１００１ＤＰにより測定を行った。また、白色度
は、ＪＩＳ規格／Ｐ８１２３に準しるものである。Further, a conventional white developer was prepared by mixing a carrier obtained by coating ferrite with a fluororesin to which no white pigment was added and a white toner. Then, using the white developer of the conventional example and the white developer of this example, a copying machine (5F-8400, manufactured by Sharp ■) was used.
When the change in whiteness due to aging was investigated at intervals of 00 sheets, 1,000 sheets, and 5,000 sheets, the results shown in Table 2 were obtained. In addition, the measurement of whiteness is
A white paper with a diameter of 4o was copied onto plain paper, and measurements were made using Z-1001DP manufactured by Nihon Heavy Industries Co., Ltd. Moreover, the whiteness is based on JIS standard/P8123.
第２表
第２表の結果より、白色顔料をキャリアに含有した本実
施例の白色現像剤は、白色顔料をキャリアに含有してい
ない従来例の白色現像剤に比べ、５００枚、１，０００
枚、および５，０００枚のエージング、いずれに対して
も白色度が高い。また、従来例の白色現像剤は５００枚
から５，０００枚のエージングを実施する間に、白色度
が７７から７０と白色度／７の低下があるのに対し、本
実施例の白色現像剤は白色度が８０から７６と白色度／
４の低下で収まっている。このため、本実施例の白色現
像剤は、エージングの枚数の増加に対しても、従来例の
白色現像剤に比べ、安定した白色度を有しているといえ
る。Table 2 From the results shown in Table 2, the white developer of this example containing a white pigment in the carrier has a higher capacity than the conventional white developer which does not contain a white pigment in the carrier.
The degree of whiteness is high both after aging of 5,000 sheets and after aging of 5,000 sheets. In addition, while the white developer of the conventional example has a decrease in whiteness of 77 to 70 during aging from 500 to 5,000 sheets, the white developer of the present example The whiteness is 80 to 76 and the whiteness is /
The decline has settled down to 4. Therefore, it can be said that the white developer of this example has more stable whiteness than the conventional white developer even when the number of aging sheets increases.
本発明に係る白色現像剤は、以上のように、キャリアの
コーティング樹脂に、白色顔料が添加されている構成で
ある。As described above, the white developer according to the present invention has a structure in which a white pigment is added to the coating resin of the carrier.
これにより、感光体に形成された静電潜像を現像する際
、白色トナーがキャリアのコーティング樹脂を剥がし、
コーティング樹脂が、白色トナーと共に静電潜像に付着
した場合においても、白色度が高く、且つ安定した白色
の複写が行えるという効果を奏する。As a result, when developing the electrostatic latent image formed on the photoreceptor, the white toner peels off the coating resin of the carrier.
Even when the coating resin adheres to the electrostatic latent image together with the white toner, there is an effect that the whiteness is high and stable white copies can be made.
Claims (1)
トナーと、コーティング樹脂を外周の表面にコーティン
グして、上記白色トナーを搬送するキャリアとの混合物
を備えた白色現像剤において、 上記キャリアのコーティング樹脂に、白色顔料が添加さ
れていることを特徴とする白色現像剤。[Claims] 1. A mixture of a white toner that develops an electrostatic latent image formed on a photoconductor into a white color, and a carrier whose outer peripheral surface is coated with a coating resin and which conveys the white toner. A white developer characterized in that a white pigment is added to the coating resin of the carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2040187A JPH03242656A (en) | 1990-02-20 | 1990-02-20 | White developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2040187A JPH03242656A (en) | 1990-02-20 | 1990-02-20 | White developer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03242656A true JPH03242656A (en) | 1991-10-29 |
Family
ID=12573779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2040187A Pending JPH03242656A (en) | 1990-02-20 | 1990-02-20 | White developer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03242656A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001002494A3 (en) * | 1999-07-02 | 2001-08-02 | Ameritech Holdings Corp | Systems and methods for producing and using fine particle materials |
| EP2335119A1 (en) * | 2008-10-07 | 2011-06-22 | Hewlett-Packard Development Company, L.P. | Treated fluoropolymer particles, methods of making treated fluoropolymer particles, toner compositions, and methods of making toner compositions |
-
1990
- 1990-02-20 JP JP2040187A patent/JPH03242656A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001002494A3 (en) * | 1999-07-02 | 2001-08-02 | Ameritech Holdings Corp | Systems and methods for producing and using fine particle materials |
| EP2335119A1 (en) * | 2008-10-07 | 2011-06-22 | Hewlett-Packard Development Company, L.P. | Treated fluoropolymer particles, methods of making treated fluoropolymer particles, toner compositions, and methods of making toner compositions |
| EP2335119A4 (en) * | 2008-10-07 | 2012-03-07 | Hewlett Packard Development Co | Treated fluoropolymer particles, methods of making treated fluoropolymer particles, toner compositions, and methods of making toner compositions |
| US8669034B2 (en) | 2008-10-07 | 2014-03-11 | Hewlett-Packard Development Company, L.P. | Treated fluoropolymer particles, methods of making treated fluoropolymer particles, toner compositions, and methods of making toner compositions |
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