JPS63289560A - Two-component type dry process developer - Google Patents
Two-component type dry process developerInfo
- Publication number
- JPS63289560A JPS63289560A JP62125256A JP12525687A JPS63289560A JP S63289560 A JPS63289560 A JP S63289560A JP 62125256 A JP62125256 A JP 62125256A JP 12525687 A JP12525687 A JP 12525687A JP S63289560 A JPS63289560 A JP S63289560A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- titanium oxide
- charge
- amount
- carrier
- 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
- 238000001035 drying Methods 0.000 title 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229920002050 silicone resin Polymers 0.000 claims abstract description 18
- 229920005989 resin Polymers 0.000 claims abstract description 17
- 239000011347 resin Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000003086 colorant Substances 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 239000010419 fine particle Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 230000003252 repetitive effect Effects 0.000 abstract 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 24
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 239000000975 dye Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- 108091008695 photoreceptors Proteins 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910002012 Aerosil® Inorganic materials 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000008119 colloidal silica Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 150000003856 quaternary ammonium compounds Chemical class 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 235000010582 Pisum sativum Nutrition 0.000 description 1
- 240000004713 Pisum sativum Species 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000000981 basic dye Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- -1 magnetite Chemical class 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/113—Developers with toner particles characterised by carrier particles having coatings applied thereto
- G03G9/1132—Macromolecular components of coatings
- G03G9/1135—Macromolecular components of coatings obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- G03G9/1136—Macromolecular components of coatings obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon atoms
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/097—Plasticisers; Charge controlling agents
- G03G9/09708—Inorganic compounds
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
技免九互
本発明は静電潜像の現像に用いられる２成分系乾式現像
剤に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-component dry developer used for developing electrostatic latent images.
従米艮亙
電子写真感光体や静電記録体上に形成された静電潜像の
現像法としては磁気ブラシ法、カスケード法等がよく知
られている。これらの現像法では従来よりバインダー樹
脂、着色剤及び極性制御剤からなるトナー粒子と酸化鉄
粉、ガラスピーズ等のキャリア粒子、又はシリコン樹脂
のような樹脂をコートしたキャリア粒子との混合物から
なるいわゆる２成分系乾式現像剤が使用されている。The magnetic brush method, the cascade method, and the like are well known as methods for developing electrostatic latent images formed on electrophotographic photoreceptors and electrostatic recording materials. In these developing methods, so-called so-called toner particles consisting of a mixture of toner particles consisting of a binder resin, a colorant, and a polarity control agent and carrier particles such as iron oxide powder or glass peas, or carrier particles coated with a resin such as silicone resin have been used. A two-component dry developer is used.
このような２成分系乾式現像剤においては、比較的大き
なキャリア粒子表面上に微小なトナー粒子が、雨粒子の
摩擦により発生した静電気力により帯電保持されており
、現像時はこの帯電トナーが静電潜像に近接又は接触し
、潜像の電荷極性に応じてその表面に吸引付着すること
により現像が行なわれる。従ってこの種の現像剤に用い
られるトナー粒子には正荷電性のものと負荷電性のもの
と２種類ある。In such a two-component dry developer, minute toner particles are held charged on the surface of relatively large carrier particles by the electrostatic force generated by the friction of rain particles, and during development, the charged toner particles are held statically. Development is performed by coming close to or in contact with the latent image and attracting and adhering to the surface depending on the charge polarity of the latent image. Therefore, there are two types of toner particles used in this type of developer: positively charged toner particles and negatively charged toner particles.
こ＼で正荷電性トナーに用いられる正荷電用極性制御剤
としては、アミノ化合物、第４級アンモニウム化合物、
及び塩基性染料とその塩が代表的である。ところでトナ
ー粒子は周知のようにバインダー樹脂（通常、スチレン
樹脂、アクリル樹脂等の熱可塑性樹脂）、着色剤及び極
性制御剤を溶融混練して樹脂中に他の２成分を分散後、
冷却固化せしめ、これを粉砕して製造されるが、前述の
ような極性制御剤は特に混線時の物理的又は機械的衝撃
、環境条件の変化等により極性制御性が低下する傾向が
ある。またこれらの極性制御剤は樹脂との相溶性が悪い
ため、樹脂中に分散し難く、分散不良を生じる結果、ト
ナーの帯電量にばらつきを生じさせるという欠点もある
。The positively charged polarity control agent used in this positively charged toner includes amino compounds, quaternary ammonium compounds,
and basic dyes and their salts are representative. By the way, toner particles are produced by melt-kneading a binder resin (usually a thermoplastic resin such as styrene resin or acrylic resin), a colorant, and a polarity control agent, and dispersing the other two components in the resin, as is well known.
Although it is produced by solidifying it by cooling and pulverizing it, the polarity control agent as described above tends to have poor polarity controllability, especially due to physical or mechanical impact during crosstalk, changes in environmental conditions, etc. Furthermore, since these polarity control agents have poor compatibility with the resin, they are difficult to disperse in the resin, resulting in poor dispersion, which also has the disadvantage of causing variations in the amount of charge on the toner.
分散性の良い極性制御剤として塩基性ニグロシン染料が
知られているが、このものは不純物として未反応の脂肪
酸や塩の分散生成物を含むため、トナー成分として用い
た時はこれら不純物がトナー表面に露出してキャリアや
感光体表面を汚染する結果、地汚れや画像濃度低下の原
因となる。そこで不純物による汚染を防ぐため、前記染
料の添加量を少なくすると、極性制御剤としての効果が
低下して帯電が不安定になり、その結果、現像部内での
攪拌により帯電の立ち上りが著しく悪くなるという欠点
がある。特にニグロシン染料に、シリコン樹脂コートキ
ャリアと組合せた２成分系現像剤においては、トナーの
帯電立ち上り性が悪いことから、経時の使用での帯電量
の変動が大きく、画像品質に著しく悪影響を及ぼす。Basic nigrosine dye is known as a polarity control agent with good dispersibility, but this dye contains dispersion products of unreacted fatty acids and salts as impurities, so when used as a toner component, these impurities are absorbed onto the toner surface. exposure to contaminates the carrier and photoreceptor surface, resulting in background smearing and a decrease in image density. Therefore, in order to prevent contamination by impurities, if the amount of the dye added is reduced, the effect as a polarity control agent will decrease and charging will become unstable.As a result, the rise of charging will be significantly worse due to stirring in the developing section. There is a drawback. In particular, in a two-component developer in which a nigrosine dye is combined with a silicone resin-coated carrier, the toner has poor charge build-up properties, so the charge amount fluctuates greatly over time, which has a significant negative impact on image quality.
また以上のような２成分系現像剤は繰返し使用によりト
ナーが凝集し易いという欠点もあった。Furthermore, the two-component developer described above also has the disadvantage that toner tends to aggregate when used repeatedly.
一方、経時の使用によるトナーの凝集を防止する目的で
トナーにコロイダルシリカ等の無機微粉体を添加するこ
とは公知であるが、通常のコロイダルシリカは負極性を
有しているため、正荷電性トナーに添加すれば帯電量が
低下するし、また特殊な正荷電用シリカを用いてトナー
の正帯電量を増大したとしても、経時の使用でキャリア
或いは感光体面上に上記添加物がフィルミングしてトナ
ーの帯電特性や感光体特性を変化させてしまう、また、
上記添加物を添加したトナーは特に高温高湿環境下で帯
電特性が変化し易いという欠点がある。これは、添加物
が表面に水分を吸着するためである。このような欠点を
改善するために特開昭５７−７８５５１号、同５９−５
２２５５号では酸化チタンを疎水化処理することが提案
されている。しかしこの疎水化処理では工程が複雑にな
り、生産コストも高くなる。On the other hand, it is known that inorganic fine powder such as colloidal silica is added to toner in order to prevent toner agglomeration due to use over time, but since ordinary colloidal silica has negative polarity, If added to the toner, the amount of charge will decrease, and even if the amount of positive charge of the toner is increased using special positively charged silica, the above additive will form a film on the carrier or photoreceptor surface after use over time. This may change the charging characteristics of the toner and the characteristics of the photoreceptor, and
Toners containing the above-mentioned additives have a drawback in that their charging characteristics tend to change, particularly in high temperature and high humidity environments. This is because the additive adsorbs moisture on the surface. In order to improve such drawbacks, Japanese Patent Application Laid-open Nos. 57-78551 and 59-5
No. 2255 proposes hydrophobizing titanium oxide. However, this hydrophobization process complicates the process and increases production costs.
目 的
本発明の目的はトナーの摩擦帯電性が安定で、繰返し使
用においても或いは高温高湿環境下においてもトナーの
帯電量変化が少なく、帯電立ち上り性が良く、キャリア
等へのフィルミングもなく、しかも経済的な正荷電２成
分系乾式現像剤を提供することである。Purpose The purpose of the present invention is to provide a toner with stable triboelectric chargeability, little change in the charge amount of the toner even after repeated use or under high temperature and high humidity environments, good charge build-up properties, and no filming on carriers, etc. Another object of the present invention is to provide an economical positively charged two-component dry developer.
構 成
本発明の２成分系乾式現像剤はバインダー樹脂、着色剤
及び正荷電用極性制御剤からなるトナー本体微粒子表面
に酸化チタンをトナー本体に対し 〜０．３重量％添加
した正荷電性トナーとシリコン樹脂コートキャリアとを
混合してなることを特徴とするものである。Structure The two-component dry developer of the present invention is a positively charged toner in which ~0.3% by weight of titanium oxide is added to the surface of fine particles of the toner body, which is composed of a binder resin, a colorant, and a positively charged polarity control agent. It is characterized by being mixed with a silicone resin coated carrier.
このように本発明現像剤の正荷電性トナーには酸化チタ
ンが使用されるが、この酸化チタンは従来のように疎水
化処理したものではない。しかしこのように疎水化処理
しない酸化チタンを用いても本発明トナーの帯電特性は
高温高湿環境下でも安定である。これは表面に無処理の
酸化チタンを添加したトナーにシリコン樹脂コートキャ
リアを組合せ使用することにより、シリコン樹脂の撥水
効果が酸化チタンの吸水作用を防止するからであると考
えられる。なお酸化チタンはそれ自体弱く正帯電してい
るため、トナー本体表面に付着させることによりトナー
本体の正荷電性を更に向上して安定化するという効果も
有している。As described above, titanium oxide is used in the positively charged toner of the developer of the present invention, but this titanium oxide is not hydrophobically treated as in the conventional case. However, even when using titanium oxide that is not subjected to hydrophobization treatment as described above, the charging characteristics of the toner of the present invention are stable even in a high temperature and high humidity environment. This is thought to be because when a toner with untreated titanium oxide added to the surface is used in combination with a silicone resin-coated carrier, the water-repellent effect of the silicone resin prevents the water-absorbing effect of titanium oxide. Note that since titanium oxide itself is weakly positively charged, it also has the effect of further improving and stabilizing the positive chargeability of the toner body by adhering it to the surface of the toner body.
本発明の正荷電性トナーは前述のようにバインダー樹脂
、着色剤及び正荷電用極性制御剤からなるトナー本体微
粒子表面に酸化チタンを特定量添加したものである。こ
＼で使用される各材料はいずれも公知のものでよく、バ
インダー樹脂としては例えばスチレン樹脂、アクリル樹
脂、ポリエステル樹脂、塩化ビニル樹脂、ポリオレフィ
ン系樹脂、及びそれらの共重合樹脂並びにブレンドが、
着色剤としてはカーボンブラック、鉄黒等が、また正荷
電用極性制御剤としてはアミノ化合物、第４級アンモニ
ウム化合物、有機染料等が挙げられる。酸化チタンとし
ては平均粒径０．０１〜２μｍのものが適当である。な
お着色剤及び極性制御剤の使用量は夫々トナー本体に対
し通常、３〜２０重量％、０．１〜１０重量％である。As described above, the positively charged toner of the present invention has a specific amount of titanium oxide added to the surface of the fine particles of the toner body, which is composed of a binder resin, a colorant, and a positively charged polarity control agent. Each material used here may be any known one, and examples of the binder resin include styrene resin, acrylic resin, polyester resin, vinyl chloride resin, polyolefin resin, and copolymer resins and blends thereof.
Examples of the coloring agent include carbon black and iron black, and examples of the polarity control agent for positive charging include amino compounds, quaternary ammonium compounds, and organic dyes. Suitable titanium oxide has an average particle size of 0.01 to 2 μm. The amounts of the colorant and polarity control agent used are generally 3 to 20% by weight and 0.1 to 10% by weight, respectively, based on the toner body.
一方、酸化チタンの使用量はトナー本体に対し０．１〜
０．３重量％である。酸化チタン量が０．１重量％未満
ではトナーの帯電立上り性の改善効果が発揮されず、ま
た０、３重量％を越えると、高温高湿環境下でのトナー
のｆ型持性が不安定となる。On the other hand, the amount of titanium oxide used is 0.1 to 0.1 to the toner body.
It is 0.3% by weight. If the amount of titanium oxide is less than 0.1% by weight, the effect of improving the toner's charge rise property will not be exhibited, and if it exceeds 0.3% by weight, the f-type retention of the toner will be unstable in a high temperature and high humidity environment. becomes.
以上のような正荷電性トナーを作るにはまず従来と同様
、バインダー樹脂１着色剤及び正荷電用極性制御剤より
なる混合物を熱ロールミルで溶融混練した後、冷却固化
せしめ、これを粉砕分級してトナー本体微粒子とし、次
にこれに酸化チタンを加え、適当な混合機で混合すれば
よい。To make the above positively charged toner, first, as in the conventional method, a mixture consisting of a binder resin, a colorant, and a positively charged polarity control agent is melted and kneaded in a hot roll mill, cooled and solidified, and then crushed and classified. The toner particles may be made into fine toner particles, and then titanium oxide may be added thereto and mixed using a suitable mixer.
一方、本発明のシリコン樹脂コートキャリア自体も材料
も公知のものでよい、キャリア粒子としては例えば鉄、
コバルト、ニッケル等の強磁性金属；マグネタイト、ヘ
マタイト、フェライトなどの合金や化合物；ガラスピー
ズ等が挙げられる。これらキャリア粒子の平均粒径は通
常１０〜１０００μｍ、好ましくは３０〜５００μｍで
ある。なおシリコン樹脂の使用量は通常キャリア粒子に
対し１〜ｌＯ重量％である。On the other hand, the silicone resin-coated carrier itself and the materials of the present invention may be of known materials, and the carrier particles may be, for example, iron,
Examples include ferromagnetic metals such as cobalt and nickel; alloys and compounds such as magnetite, hematite, and ferrite; and glass beads. The average particle diameter of these carrier particles is usually 10 to 1000 μm, preferably 30 to 500 μm. The amount of silicone resin used is usually 1 to 10% by weight based on the carrier particles.
以上のようなシリコン樹脂コートキャリアを作るには従
来と同様、キャリア粒子の表面に噴霧法、浸漬法等の塗
布法でシリコン樹脂をコートすればよい。To make the silicone resin coated carrier as described above, the surface of carrier particles may be coated with a silicone resin by a coating method such as a spraying method or a dipping method, as in the conventional method.
本発明の２成分系現像剤を作るには以上のようにして得
られる正荷電性トナーとシリコン樹脂コートキャリアと
を混合すればよい。To prepare the two-component developer of the present invention, the positively charged toner obtained as described above and a silicone resin coated carrier may be mixed.
なおキャリア及びトナーの使用量はトナー粒子がキャリ
ア粒子の被覆層に付着してその表面積の３０〜９０％を
占める程度、具体的には前記トナーとキャリアとの混合
比は１ ： １００〜１０：１００（重量）程度である
。The amount of carrier and toner to be used is such that toner particles adhere to the coating layer of carrier particles and occupy 30 to 90% of the surface area thereof. Specifically, the mixing ratio of the toner and carrier is 1:100 to 10: It is about 100 (weight).
以下に本発明を実施例によって説明する。The present invention will be explained below by way of examples.
なお部は全て重量部である。Note that all parts are parts by weight.
実施例１
スチレン−ｎ−ブチルメタクリレート共重合体 ８７
部カーボンブラック １
０部塩基性ニグロシン染料 ３
部よりなる混合物を１２０℃の熱ロールで溶融混練した
後、冷却固化せしめ、これをジェットミルで粉砕し、分
級して平均粒径１０μｍのトナー本体微粒子とした。次
にトナー本体１００部と酸化チタン（日本アエロジル社
製Ｐ−２５）０．３部とをヘンシェルミキサーで混合し
て正荷電性トナーを作った。Example 1 Styrene-n-butyl methacrylate copolymer 87
Part carbon black 1
0 parts basic nigrosine dye 3
After melting and kneading the mixture consisting of 50% by heat roll at 120° C., the mixture was cooled and solidified, and the mixture was pulverized by a jet mill and classified to obtain toner main fine particles having an average particle size of 10 μm. Next, 100 parts of the toner body and 0.3 parts of titanium oxide (P-25, manufactured by Nippon Aerosil Co., Ltd.) were mixed in a Henschel mixer to prepare a positively charged toner.
一方、平均粒径１００μｍの球状フェライト１０００重
量部にシリコン樹脂の２シｔ％トルエン溶液１０００部
を流動床型塗布装置を用いて塗布し、シリコン樹脂コー
トキャリアを作った。On the other hand, 1000 parts by weight of spherical ferrite having an average particle diameter of 100 μm was coated with 1000 parts of a 2 t% toluene solution of silicone resin using a fluidized bed coating device to prepare a silicone resin coated carrier.
次に前記正荷電性トナー３部と前記シリコン樹脂コート
キャリア１００部とを混合して２成分系乾式現像剤を作
った。Next, 3 parts of the positively charged toner and 100 parts of the silicone resin coated carrier were mixed to prepare a two-component dry developer.
こうして得られた現像剤を市販の普通紙複写機にセット
し、有機感光体上に形成された静電潜像を現像し、得ら
れた画像を普通紙上に転写定着させたところ、高濃度で
地汚れのない定着画像が得られた。引続き前記現像及び
転写工程を１分間３０回の速さで５万回繰返し、トナー
の帯電特性を調べたところ、初期の帯電量＋１９μｃ／
ｇに対して、５万回コピー後の帯電量は＋１７μｃ／ｇ
と安定で、画質も初期に比べて薄色なかった。また３０
℃、９０％ＲＨの環境条件下でも帯電量は＋１８μＣ／
ｇと安定で、画像も良好であった。The developer thus obtained was placed in a commercially available plain paper copying machine to develop the electrostatic latent image formed on the organic photoreceptor, and the resulting image was transferred and fixed onto plain paper. A fixed image without background smear was obtained. Subsequently, the above development and transfer steps were repeated 50,000 times at a rate of 30 times per minute, and the charging characteristics of the toner were examined. As a result, the initial charge amount was +19μc/
The amount of charge after 50,000 copies is +17 μc/g.
It was stable and the image quality was not as pale compared to the initial one. 30 again
Even under the environmental conditions of ℃ and 90%RH, the charge amount is +18μC/
It was stable at g, and the image was also good.
比較例１
酸化チタンの代りにコロイダルシリカ（日本アエロジル
社製Ｒ−９７２）を用いた他は実施例１と同じ方法で２
成分系乾式現像剤を作り。Comparative Example 1 The same method as Example 1 was carried out except that colloidal silica (R-972 manufactured by Nippon Aerosil Co., Ltd.) was used instead of titanium oxide.
Creates a component-based dry developer.
実施例１と同様に試験した。その結果、初期の帯電量は
＋１７μｃ／ｇで画像も良好であったのに対し、試験後
の帯電量は＋１０μｃ／ｇで地汚れの多い画像であった
。また、３０°Ｃ１９０％ＲＨの環境下では帯電量は＋
１４μｃ／ｇであった。The test was conducted in the same manner as in Example 1. As a result, the initial charge amount was +17 μc/g and the image was good, but the charge amount after the test was +10 μc/g and the image had a lot of background stains. In addition, under an environment of 30°C and 190%RH, the amount of charge is +
It was 14μc/g.
比較例２
酸化チタン量を０．５部とした他は実施例１と同じ方法
で２成分系乾式現像剤を作り、同様に試験した。その結
果、初期の帯電量は＋２０μｃ／ｇで画像も良好であっ
た。試験後の帯電量も＋１９μｃ／ｇと安定であった。Comparative Example 2 A two-component dry developer was prepared in the same manner as in Example 1, except that the amount of titanium oxide was changed to 0.5 part, and tested in the same manner. As a result, the initial charge amount was +20 μc/g and the image was good. The amount of charge after the test was also stable at +19 μc/g.
しがし３０°Ｃ１９０％ＲＨの環境条件下では帯電量は
＋１３μｃ／ｇと不安定であった。Under the environmental conditions of 30° C. and 190% RH, the charge amount was unstable at +13 μc/g.
実施例２
酸化チタンとして日本エアロジル社製５ＴＴ−６５Ｃを
用いた他は実施例１と同じ方法で２成分系乾式現像剤を
作り、実施例１と同様に試験した。その結果、初期の帯
電量は＋１８μＣ／ｇで、画像も良好であった。試験後
の帯電量も＋２０μｃ／ｇと安定であった。また３０℃
、９０％ＲＨの環境条件下でも帯電量は＋１６μＣ／ｇ
と安定していた。Example 2 A two-component dry developer was prepared in the same manner as in Example 1, except that 5TT-65C manufactured by Nippon Aerosil Co., Ltd. was used as titanium oxide, and tested in the same manner as in Example 1. As a result, the initial charge amount was +18 μC/g, and the image was good. The amount of charge after the test was also stable at +20 μc/g. Also 30℃
, the amount of charge is +16μC/g even under the environmental condition of 90%RH.
It was stable.
実施例３
酸化チタン量を０．１部とした他は実施例１と同じ方法
で２成分系乾式現像剤を作り、同様に試験した。その結
果、初期の帯電量は＋１８μｃ／ｇで試験後も＋１９μ
ｃ／ｇと安定しており、画像も良好であった。また３０
℃、９０％ＲＨの環境下でも帯電量は＋１７μｃ／ｇと
安定であった。Example 3 A two-component dry developer was prepared in the same manner as in Example 1, except that the amount of titanium oxide was changed to 0.1 part, and tested in the same manner. As a result, the initial charge amount was +18μc/g, and after the test it was still +19μc/g.
It was stable at c/g and the image was good. 30 again
The charge amount was stable at +17 μc/g even in an environment of 90% RH.
比較例３
酸化チタンを用いなかった他は実施例１と同じ方法で２
成分系乾式現像剤を作り、同様に試験した。その結果、
初期の帯電量は＋１８μｃ／ｇで画像は良好であったが
、試験中、帯電量は最大＋２７μｃ ／ ｇに上昇し、
画像濃度も低下した。また３０℃、９０％ＲＨの環境下
では帯電量は＋１０μｃ ／ ｇと不安定であった。Comparative Example 3 The same method as Example 1 was carried out except that titanium oxide was not used.
A component-based dry developer was prepared and tested in the same manner. the result,
The initial charge amount was +18μc/g and the image was good, but during the test, the charge amount rose to a maximum of +27μc/g.
Image density also decreased. Furthermore, under an environment of 30°C and 90% RH, the amount of charge was unstable at +10 μc/g.
比較例４
シリコン樹脂コートを行なわなかった他は実施例１と同
じ方法で２成分系乾式現像剤を作り、同様に試験した。Comparative Example 4 A two-component dry developer was prepared in the same manner as in Example 1, except that no silicone resin coating was performed, and it was tested in the same manner.
その結果、初期の帯電量は＋１７μｃ／ｇであったが、
試験後の帯電量は＋９μｃ／ｇと不安定で、また地汚れ
の多い画像であった。また３０℃、９０％ＲＨの環境条
件下でも帯電量は＋１０μｃ／ｇと不安定であった・
比較例５
シリコン樹脂の２ｗｔ％トルエン溶液の代りにメチルメ
タクリレート（ＭＭＡ）樹脂の１０ｗｔ％トルエン溶液
を用いた他は実施例１と同じ方法で２成分系乾式現像剤
を作り、同様に試験した。その結果、初期の帯電量は＋
１６μｃ／ｇであったが、試験後は酸化チタンがフィル
ミングした上、帯電量は＋８μｃ／ｇとなった。また３
０℃、９０％ＲＨの環境下では帯電量は＋７μｃ ／
ｇと不安定であった。As a result, the initial charge amount was +17μc/g,
The amount of charge after the test was unstable at +9 μc/g, and the image had a lot of background stains. Furthermore, the charge amount was unstable at +10 μc/g even under the environmental conditions of 30°C and 90% RH. Comparative Example 5 A 10 wt% toluene solution of methyl methacrylate (MMA) resin was used instead of a 2 wt% toluene solution of silicone resin. A two-component dry developer was prepared in the same manner as in Example 1, except that it was used, and tested in the same manner. As a result, the initial charge amount is +
However, after the test, titanium oxide filmed and the amount of charge was +8 μc/g. Also 3
In an environment of 0℃ and 90%RH, the amount of charge is +7μc/
g and unstable.
以上の結果をまとめて下表に示した。なお同表には添加
物のフィルミングの有無についても付記した。The above results are summarized in the table below. In addition, the presence or absence of filming of additives is also noted in the same table.
（以下余白）
勿果
」ス−Ｈの如く本発明の正荷電２成分系乾式現像剤は表
面に酸化チタンを添加した正荷電性トナーにシリコン摺
脂コー１−キャリアを組合せ使用したので、トナーの摩
擦イ；Ｆ電性が安定で、繰返し使用においても、或いは
高温高湿環境下においても１ヘナーの帯電量変化が少な
く、帯電立ち上り性が良く、キャリア等へのフィルミン
グもなく、しかも経済的に地１ηれのない良質画像を形
成できるという特長を有している。(The following is a blank space) The positively charged two-component dry developer of the present invention, such as "Makkou" Su-H, uses a positively charged toner with titanium oxide added to the surface in combination with a silicone resin coater 1-carrier. Friction A: Stable electrification, little change in the charge amount of 1 hener even after repeated use or under high temperature and high humidity environments, good charge build-up, no filming on carriers, etc., and economical. It has the advantage of being able to form high-quality images with no background blur.
Claims (1)
らなるトナー本体微粒子表面に酸化チタンをトナー本体
に対し０．１〜０．３重量％添加した正荷電性トナーと
シリコン樹脂コートキャリアとを混合してなる２成分系
乾式現像剤。1. A positively charged toner in which 0.1 to 0.3% by weight of titanium oxide is added to the surface of the fine particles of the toner body consisting of a binder resin, a colorant, and a positively charged polarity control agent, and a silicone resin coated carrier. A two-component dry developer made by mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62125256A JPS63289560A (en) | 1987-05-21 | 1987-05-21 | Two-component type dry process developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62125256A JPS63289560A (en) | 1987-05-21 | 1987-05-21 | Two-component type dry process developer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63289560A true JPS63289560A (en) | 1988-11-28 |
Family
ID=14905599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62125256A Pending JPS63289560A (en) | 1987-05-21 | 1987-05-21 | Two-component type dry process developer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63289560A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03126044A (en) * | 1989-10-12 | 1991-05-29 | Tomoegawa Paper Co Ltd | Electrophotographic binary developer |
-
1987
- 1987-05-21 JP JP62125256A patent/JPS63289560A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03126044A (en) * | 1989-10-12 | 1991-05-29 | Tomoegawa Paper Co Ltd | Electrophotographic binary developer |
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