201009523 • 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種顯像組成物，尤指一種適用於靜電 潛像顯影之顯像組成物，俾能應用於黑白或全彩的影印機 5 及雷射印表機之顯像組成物。 【先前技術】 P遺著電腦及周邊設備的發展和普及，影印機及雷射印 〇 ㈣已成為常見之列印設備之一。其中，影印機及雷射印 10表機皆有屬於-種雙成分顯像系統，係利用靜電潛像顯影 將圖像顯示出來。 一般之雙成分顯像系統係在顯影器中裝設載體及碳粉 粒子，透過摩擦後使顯像劑中的碳粉帶靜電，再經雙成分 顯像系統中帶與碳粉相反電性之感光鼓與碳粉之靜電吸附 15後，形成碳粉圖像。然而，在常用之雙成分顯像系統之影 印機及雷射印表機中，經連續列印之後，碳粉在顯像劑中 ® 之濃度會有所變化，導致碳粉摩擦帶電量的改變。由於靜 電潛像顯影與碳粉帶電量有極密切的關係，因此若碳粉摩 擦帶電量改變，則會造成列印品質劣化。為了要維持長時 20間列印的列印品質，一般而言，影印機及雷射印表機會自 動調整佈電電壓及磁棒偏壓來維持長時間列印的列印品 質。 雖透過調整佈電電壓及磁棒偏壓可維持列印品質，然 而’若能同時改善顯像劑中碳粉摩擦帶電量之穩定度，更 5 201009523 5 10 15 參 20 能使列印品質更加提升。美國專利第2〇〇3/〇186154號係提 供一種載體及使用其之顯影劑，其載體表面具有一包含丙 烯酸樹脂及矽樹脂之表面塗佈層，以改善載體表面不均勻 度，而提升長時間列印之列印品質。美國專利第5,554,477 號係提供一種顯影系統，其透過一具有較高導電度之載 體，而在經過長時間列印之後仍可維持極高的導電鍍。此 外，美國專利第5,702,858號係提供一種顯影劑，其具有較 高的荷電性及流動性，而能提升影像品質及密度。 目前雖然已有許多研究試圖改善長時間列印之列印品 質，然而現今碳粉產業中所使用的碳粉，其表面形狀大多 為不規則形’因此在與載體摩擦時，碳粉表面與載體表面 的接觸面積較低’故碳粉表面的帶電量也較低。若能從碳 粉表面形狀進行改善，勢必能維持碳粉表面的帶電量。如 此，即使經過長時間列印，仍能維持碳粉帶電量之穩定性， 進而達到改善列印品質的目的。 【發明内容】 本發月之主要目的係在提供一種顯像組成物，藉由改 變碳粉形㈣提升碳粉摩卿電量之狀度，俾能維持長 時間列印之列印品質。 為達成上述目的，本發明係提供一種顯像組成物，包 ^ ·載體、以及碳粉組絲。其巾碳粉組成物包含碳粉粒 子，且碳粉粒子之圓度係大於或等於〇 95。 6 201009523 其中，圓度Soundness)」之定義，係指碳粉粒子實 際輪廓相對於理想圓的徑向偏移量，亦即相對於同一圓心 之最大半徑與最小半徑的差值來表示。 5 ❹ 10 15 ❹ 由於本發明之碳粉粒子之圓度係大於或等於〇95，因 此，相較於習知顯像組成物中之碳粉粒子，其表面的形狀 較規則。此外，由於本發明之碳粉粒子形狀接近圓形，故 可提高碳粉粒子的表面與載體接觸的面積。經長時間列印 之後，即使顯像組成物中碳粉濃度減少，仍能保持碳粉粒 子表面與載體之間具有較大的接觸面積，進而維持碳粉的 摩擦帶電量。故本發明是藉由碳粉形狀的改變，達到提升 顯像組成物中碳粉摩擦帶電量的穩定度之目的。 在本發明之顯像組成物中，載體為一磁性粒子，且此 磁性粒子可為至少一種選自由磁鐵礦（magnetite)、鐵粉汾的 powder)、鋼（steel)、亞鐵鹽（ferrite)、磁性氧化鐵（邮卿价 inm oxide)、及其混合物所組成之群組。此外，本發明之顯 像組成物之載體含量並無特殊限制，較 顯像組成物總重量之90〜99重量百分比。此外，：發= 像組成物之碳粉粒子含量並無特殊限制，較佳為，碳粉粒 子含量為顯像組成物總重量之卜丨❶重量百分比。 在本發明之顯像組成物中，碳粉組成物更可包含一樹 脂’此樹脂可為至少-種選自由苯乙稀丙烯酸共聚合物樹 脂、聚醋樹脂、苯乙烯-丁三酿共聚合物樹脂、及其混合物 所組成之群組。較佳為’在本發明之顯像組成物中，碳粉 組成物之樹脂係為聚醋樹脂。此外，本發明之碳粉組成物 20 201009523 • 之樹脂含量並無特殊限制，較佳為，樹脂含量為顯像組成 物總重量之60~90重量百分比。 本發明之顯像組成物中，碳粉組成物更可包含一電荷 控制劑。其中，此電荷控制劑可包含一金屬錯化合物。在 5 本發明之本發明之顯像組成物中，電荷控制劑之含量並無 特殊限制，較佳為’電荷控制劑含量為碳粉組成物總重量 之0.5〜5重量百分比。 本發明之顯像組成物中，碳粉組成物更可包含一色 ® 料。其中，此色料可為碳黑、磁鐵粉末、或顏料。在本發 1〇 明之顯像組成物中，碳粉組成物之色料含量並無特殊限 制’較佳為’色料之含量為碳粉組成物總重量之3〜2〇重量 百分比。 再者，本發明之顯像組成物中，碳粉組成物更可包含 1 一潤滑劑。其中，此潤滑劑可為至少一種選自由聚丙烯蠟、 15聚乙烯蠟、米蠟、棕梠蠟、聚酯蠟、石蠟所組成之群組。 在本發明之顯像組成物中，碳粉組成物之潤滑劑含量並無 蟾 #殊限制’較佳為’潤滑劑之含量為碳粉組成物總重量之 1〜8重量百分比。 20勺人在本發明之顯像組成物中，本發明之碳粉組成物更可 2 3無機外添加劑。在本發明之顯像組成物中，碳粉組 成物之外添加劑可為至少—種選自由鈦㈣、氧化銘、氧 :鈦：氧化鋁、氧化鈽、氧化矽、及其混合物所組成之群 Γ铜同時、’外添加劑之含量並無特殊限制，較佳為，外添 1含量為碳粉組成物總重量之0.1〜3重量百分比。 8 201009523 此外，本發明之顯像組成物，其係使用習知之傳統製 程或化學製備方法方法製程。較佳為，本發明之顯像組成 物之製備方法包括下列步驟：（A)提供一載體、一碳粉粒 子；（B)將樹脂、色料、電荷控制劑、潤滑劑等組成以 5 Henschel mixer混合均勻，以押出機將這些混合物混練之， 再以jet mill將混練物磨成6〜8um的碳粉粒子，利用表面處 理設備將碳粉粒子的表面處理成不同的圓度，最後再以 Henschel mixer將碳粉粒子與無機外添加劑混合均勻，製得 一碳粉組成物；（C)以ball mill均勻混合載體、碳粉組成 10 物，以製得一顯像組成物；其中此顯像組成物中碳粉粒子 圓度係大於或等於0.95。 再者，於本發明之顯像組成物中，於步驟（B)後更可選 擇性的添加電荷控制劑或無機外添加劑。藉由改變添加電 荷控制劑或無機外添加劑的種類及重量百分比，可幫助維 15 持本發明顯像組成物中之碳粉粒子帶電量。 【實施方式】 以下具體實施例中，本發明顯像組成物主要包括一載 體、以及一碳粉組成物，其中，碳粉組成物包含碳粉粒子。 20 同時，載體係為磁性粒子，而碳_粉組成物更包含一樹脂、 色料、電荷控制劑、潤滑劑、及無機外添加劑等。此外， '本發明之重點為其所使用之碳粉粒子圓度係大於或等於 0.95。 9 201009523 • 此外，除非有特別說明，否則本發明實施例中所使用 的份數或百分比皆以重量為單位。 實施例1 首先’將93重量百分比之聚酯樹脂、4重量百分比之碳 5 黑、1重量百分比之電荷控制劑、以及2重量百分比之潤滑 劑均勻混合得一混合物。再以雙軸押出機混練此混合物， 接著再以jet mill將混練物磨成6〜8uin的碳粉粒子，利用表 面處理設備將碳粉粒子的表面處理成不同的圓度，最後再 φ 以Henschel mixer將碳粉粒子與1重量百分比之氧化矽均 10 勻混合之、以得到最後的碳粉粒子，再以ball mill均勻混 合載體、碳粉粒子即可製得一顯像組成物。在此，藉由調 整表面處理設備，可控制本實施例顯像組成物之碳粉粒子 之圓度。在本實施例中，碳粉粒子之圓度約為0.957。此外， 本實施例之顯像組成物中碳粉粒子之重量百分比（T/C)為 15 1%。 實施例2 Φ 本實施例之製備方法與實施例1大致相同。在本實施例 之顯像組成物中，碳粉粒子之圓度約為〇.957，且碳粉粒子 之重量百分比（T/C)為3%。 20 實施例3 本實施例之製備方法與實施例1大致相同。在本實施例 之顯像組成物中，碳粉粒子之圓度約為0_957，且碳粉粒子 之重量百分比（T/C)為5%。 實施例4 201009523 • 本實施例之製備方法與實施例1大致相同。在本實施例 之顯像組成物中’碳粉粒子之圓度約為0.957，且碳粉粒子 之重量百分比（T/C)為7%。 實施例5 5 本實施例之製備方法與實施例1大致相同。除了碳粉粒 子經表面處理後製得之顯像組成物的碳粉粒子孓圓度約為 0.964，且碳粉粒子之重量百分比（T/C)為1%。 實施例6 本實施例之製備方法與實施例5大致相同。在本實施例 10 之顯像組成物t ’碳粉粒子之圓度約為0.964，且碳粉粒子 之重量百分比（T/C)為3%。 實施例7 本實施例之製備方法與實施例5大致相同。在本實施例 之顯像組成物中，碳粉粒子之圓度約為0.964，且碳粉粒子 15 之重量百分比（T/C)為5%。 實施例8 本實施例之製備方法與實施例5大致相同。在本實施例 之顯像組成物令，碳粉粒子之圓度約為〇·964，且碳粉粒子 之重量百分比（T/C)為7%。 2〇 比較例1 本實施例之製備方法與實施例1大致相同，除了研磨後 製得之顯像組成物的碳粉粒子之圓度約為0.911。且碳粉粒 子之重量百分比（T/C)為1%。 比較例2 11 201009523 . 本實施例之製備方法與比較例1大致相同。在本比較例 之顯像組成物中，碳粉粒子之圓度約為0.911，且碳粉粒子 之重量百分比（T/C)為3%。 比較例3 5 本實施例之製備方法與比較例1大致相同。在本比較例 之顯像組成物中，碳粉粒子之圓度約為0.911，且礙粉粒子 之重量百分比（T/C)為5%。 比較例4 I 本實施例之製備方法與比較例1大致相同。在本比較例 10 之顯像組成物中，碳粉粒子之圓度約為0.957，且碳粉粒子 之重量百分比（T/C)為7%。 實驗例：測量碳粉粒子摩擦帶電量 將上述實施例1-8、及比較例1-4製備之顯像組成物分 別置ball mill中混合均勻、混合時間為10分鐘，混合轉速 15 為70rpm，取0.3〜0.5gm混合好的顯像組成物，置於於一法 拉第籠（Faraday cage)中，以bowl-off方式，測量顯像組成物 中碳粉粒子之摩擦帶電量（q/m)。實驗結果如下表1所示： 礙粉粒子圓度 碳粉粒子重量百分比 摩擦帶電量 T/C (%) q/m (β C/gm) 實施例1 0.957 1 15.1 實施例2 0.957 3 16.2 實施例3 0.957 5 18.2 實施例4 0.957 7 14.7 實施例5 0.964 1 21.6 12 201009523 實施例ό ~09¾ - ----- 3 22.4 實施例7 0.964 5 19.8 實施例8 0.964 7 15.8 比牧例1 0.911 1 24.5 比較例2 ~〇911 3 17.3 比較例3 I.W Λ ^0911 ?Γ7Γ；----—,. 5 14.7 0.911 7 9.8 5 10 ❹ 圖1係為實施例1〜8及比較例1〜4中，碳粉重量百分比 (T/C)與摩擦帶電量（q/m)之關係圖。如圖丨所示，當碳粉粒 子圓度為〇.957時（實施例1〜4)或為0.964時（實施例5〜8)，其 摩擦帶電量之變化較平穩。反觀比較例丨~4，其碳粉粒子圓 度為0_911，其摩擦帶電量會隨著顯像組成物中碳粉粒子之 重量百分比不同而有明顯的變化。 綜上所述，本發明之顯像組成物，由於碳粉粒子之形 狀更接近圓形，能提升碳粉粒子與載體之接觸面積，使碳 粕粒子之摩擦帶電量可維持穩定的狀況。因此，本發明之 顯像組成物，可改善因碳粉表面不規則而導致顯像組成物 申碳粉濃度越高摩擦帶電量會越低的情形。因此，本發明 之顯像組成物，其碳粉粒子之摩擦帶電量較不受碳粉粒子 濃度之影響，故更能維持長時間列印之列印品質。 上述實施例僅係為了方便說明而舉例而已，本發明所 主張之權利㈣自應以巾請專利範圍所述為準，而非僅限 於上述實施例》 13 15 201009523 參201009523 • IX. INSTRUCTIONS: TECHNICAL FIELD The present invention relates to a developing composition, and more particularly to a developing composition suitable for electrostatic latent image development, which can be applied to a black and white or full color photocopying machine. 5 and the imaging composition of the laser printer. [Prior Art] The development and popularization of P's legacy computer and peripheral equipment, photocopiers and laser printing (4) have become one of the common printing equipment. Among them, both the photocopier and the laser printer 10 have a two-component imaging system, which uses an electrostatic latent image to develop an image. In the general two-component imaging system, a carrier and toner particles are installed in the developing device, and the carbon powder in the developer is electrostatically charged after being rubbed, and then the opposite polarity of the carbon powder is transmitted through the two-component developing system. After the photosensitive drum and the toner are electrostatically adsorbed 15, a toner image is formed. However, in the copiers and laser printers of the commonly used two-component imaging system, after continuous printing, the concentration of toner in the developer will change, resulting in a change in the frictional charge of the toner. . Since the development of the electrostatic latent image is closely related to the amount of toner charged, if the toner is charged, the print quality will deteriorate. In order to maintain the print quality of 20 prints for a long time, in general, the photocopier and the laser printer automatically adjust the voltage of the cloth and the bias of the bar to maintain the print quality for a long time. Although the printing quality can be maintained by adjusting the voltage of the wiring and the bias of the magnetic bar, however, if the stability of the frictional charge of the toner in the developer can be improved at the same time, the quality of the printing can be further improved by 2010-0523 5 10 15 Upgrade. U.S. Patent No. 2/3,186,154 provides a carrier and a developer using the same, which has a surface coating layer comprising an acrylic resin and a enamel resin to improve the surface unevenness of the carrier and increase the length. Time print quality. U.S. Patent No. 5,554,477 provides a developing system which maintains a very high degree of conductive plating after a long period of printing through a carrier having a relatively high conductivity. Further, U.S. Patent No. 5,702,858 provides a developer which has higher chargeability and fluidity and which can improve image quality and density. Although many studies have been attempted to improve the printing quality for long-term printing, the toner used in the toner industry today has a surface shape which is mostly irregular. Therefore, when rubbed against the carrier, the surface and carrier of the toner The contact area of the surface is low, so the charge amount on the surface of the toner is also low. If the shape of the carbon powder is improved, it is necessary to maintain the charge amount on the surface of the toner. As a result, even after a long time of printing, the stability of the toner charge can be maintained, thereby improving the print quality. SUMMARY OF THE INVENTION The main purpose of this month is to provide a developing composition which can improve the printing quality of a long time by changing the shape of the carbon powder (4). In order to achieve the above object, the present invention provides a developing composition comprising a carrier, and a toner filament. The towel toner composition contains carbon particles, and the roundness of the toner particles is greater than or equal to 〇 95. 6 201009523 wherein "roundness" is defined as the radial offset of the actual contour of the toner particles relative to the ideal circle, that is, the difference between the maximum radius and the minimum radius of the same center. 5 ❹ 10 15 ❹ Since the roundness of the carbon powder particles of the present invention is greater than or equal to 〇95, the shape of the surface of the toner particles in the conventional image forming composition is relatively regular. Further, since the shape of the carbon powder particles of the present invention is close to a circular shape, the area of the surface of the carbon powder particles in contact with the carrier can be increased. After printing for a long period of time, even if the toner concentration in the developing composition is reduced, a large contact area between the surface of the toner particles and the carrier can be maintained, thereby maintaining the frictional charge amount of the toner. Therefore, the present invention achieves the purpose of improving the stability of the toner triboelectric charge in the developing composition by changing the shape of the carbon powder. In the developing composition of the present invention, the carrier is a magnetic particle, and the magnetic particle may be at least one selected from the group consisting of magnetite, iron powder, steel, ferrous iron (ferrite) ), a group of magnetic iron oxide (inm oxide), and a mixture thereof. Further, the carrier content of the imaging composition of the present invention is not particularly limited and is 90 to 99% by weight based on the total weight of the imaging composition. Further, the content of the toner particles of the composition = the composition is not particularly limited, and preferably, the toner particle content is the weight percentage of the dip of the total weight of the developing composition. In the developing composition of the present invention, the carbon powder composition may further comprise a resin. The resin may be at least one selected from the group consisting of styrene-acrylic acid copolymer resin, polyester resin, and styrene-butyl triglyceride. a group of resins, and mixtures thereof. Preferably, in the developing composition of the present invention, the resin of the toner composition is a polyester resin. Further, the toner composition of the present invention 20 201009523 • The resin content is not particularly limited, and preferably, the resin content is 60 to 90% by weight based on the total weight of the developing composition. In the developing composition of the present invention, the toner composition may further contain a charge control agent. Wherein, the charge control agent may comprise a metal-missing compound. In the developing composition of the present invention, the content of the charge control agent is not particularly limited, and it is preferred that the 'charge controlling agent content is 0.5 to 5 % by weight based on the total weight of the carbon powder composition. In the developing composition of the present invention, the toner composition may further comprise a coloring material. Wherein, the color material may be carbon black, magnet powder, or pigment. In the developing composition of the present invention, the toner content of the toner composition is not particularly limited. Preferably, the content of the toner is 3 to 2% by weight based on the total weight of the carbon powder composition. Further, in the developing composition of the present invention, the toner composition may further comprise a lubricant. Wherein, the lubricant may be at least one selected from the group consisting of polypropylene wax, 15 polyethylene wax, rice wax, palm wax, polyester wax, and paraffin wax. In the developing composition of the present invention, the lubricant composition of the carbon powder composition is not limited to </ RTI> preferably. The content of the lubricant is 1 to 8 weight% based on the total weight of the carbon powder composition. 20 scoops of the object In the developing composition of the present invention, the carbon powder composition of the present invention is more preferably an inorganic inorganic additive. In the developing composition of the present invention, the additive other than the carbon powder composition may be at least one selected from the group consisting of titanium (tetra), oxidized, oxygen: titanium: alumina, cerium oxide, cerium oxide, and mixtures thereof. The content of the bismuth copper and the 'external additive' is not particularly limited. Preferably, the external addition 1 content is 0.1 to 3 weight% based on the total weight of the carbon powder composition. 8 201009523 Further, the imaging composition of the present invention is processed using a conventional conventional process or a chemical preparation method. Preferably, the method for preparing the developing composition of the present invention comprises the steps of: (A) providing a carrier, a carbon powder particle; (B) forming a resin, a colorant, a charge control agent, a lubricant, etc. to 5 Henschel Mix the mixer evenly, mix the mixture with the extruder, and then grind the mixture into 6~8um toner particles by jet mill, and treat the surface of the toner particles into different roundness by surface treatment equipment. Finally, Henschel mixer mixes the carbon powder particles and the inorganic external additive uniformly to obtain a carbon powder composition; (C) uniformly mixes the carrier and the carbon powder composition with a ball mill to prepare an imaging composition; wherein the image is formed The roundness of the carbon powder particles in the composition is greater than or equal to 0.95. Further, in the developing composition of the present invention, a charge control agent or an inorganic external additive is more optionally added after the step (B). By changing the kind and weight percentage of the added charge control agent or inorganic external additive, it is possible to help maintain the charge amount of the toner particles in the developing composition of the present invention. [Embodiment] In the following specific embodiments, the developing composition of the present invention mainly comprises a carrier and a toner composition, wherein the toner composition contains toner particles. 20 At the same time, the carrier is magnetic particles, and the carbon-powder composition further comprises a resin, a colorant, a charge control agent, a lubricant, and an inorganic external additive. Further, 'the focus of the present invention is that the toner particle roundness system used is greater than or equal to 0.95. 9 201009523 • Further, the parts or percentages used in the embodiments of the present invention are by weight unless otherwise specified. Example 1 First, 93 parts by weight of a polyester resin, 4% by weight of carbon 5 black, 1% by weight of a charge control agent, and 2% by weight of a lubricant were uniformly mixed to obtain a mixture. Then, the mixture is kneaded by a double-axis extruder, and then the kneaded material is ground into 6~8uin toner particles by a jet mill, and the surface of the carbon powder particles is processed into different roundness by surface treatment equipment, and finally φ is taken to Henschel. The mixer uniformly mixes the carbon powder particles with 1% by weight of cerium oxide to obtain the final carbon powder particles, and then uniformly mixes the carrier and the carbon powder particles with a ball mill to prepare an imaging composition. Here, the roundness of the toner particles of the developing composition of the present embodiment can be controlled by adjusting the surface treating apparatus. In the present embodiment, the roundness of the toner particles is about 0.957. Further, the weight percentage (T/C) of the carbon powder particles in the developing composition of the present embodiment was 15 1%. Example 2 Φ The preparation method of this example was substantially the same as that of Example 1. In the developing composition of this embodiment, the roundness of the carbon powder particles was about 957.957, and the weight percentage (T/C) of the carbon powder particles was 3%. 20 Example 3 The preparation method of this example was substantially the same as that of Example 1. In the developing composition of this embodiment, the toner particles have a roundness of about 0 to 957, and the weight percentage (T/C) of the carbon powder particles is 5%. Example 4 201009523 • The preparation method of this example is substantially the same as that of Example 1. In the developing composition of this embodiment, the roundness of the toner particles was about 0.957, and the weight percentage (T/C) of the carbon powder particles was 7%. Example 5 5 The preparation method of this example was substantially the same as that of Example 1. The toner particles obtained by the surface treatment of the carbon particles were rounded to a particle size of about 0.964, and the weight percentage (T/C) of the carbon powder particles was 1%. Example 6 The preparation method of this example was substantially the same as that of Example 5. In the developing composition 10 of the present embodiment, the roundness of the toner particles was about 0.964, and the weight percentage (T/C) of the carbon powder particles was 3%. Example 7 The preparation method of this example was substantially the same as that of Example 5. In the developing composition of this embodiment, the roundness of the carbon powder particles was about 0.964, and the weight percentage (T/C) of the carbon powder particles 15 was 5%. Example 8 The preparation method of this example was substantially the same as that of Example 5. In the developing composition of this embodiment, the roundness of the toner particles was about 964·964, and the weight percentage (T/C) of the carbon powder particles was 7%. 2 〇 Comparative Example 1 The preparation method of this example was substantially the same as that of Example 1, except that the toner particles of the development composition obtained after the polishing had a roundness of about 0.911. And the weight percentage (T/C) of the carbon particles is 1%. Comparative Example 2 11 201009523 . The preparation method of this example is substantially the same as that of Comparative Example 1. In the developing composition of this comparative example, the roundness of the carbon powder particles was about 0.911, and the weight percentage (T/C) of the carbon powder particles was 3%. Comparative Example 3 5 The preparation method of this example was substantially the same as that of Comparative Example 1. In the developing composition of this comparative example, the roundness of the carbon powder particles was about 0.911, and the weight percentage (T/C) of the powder particles was 5%. Comparative Example 4 I The preparation method of this example was substantially the same as that of Comparative Example 1. In the developing composition of Comparative Example 10, the roundness of the carbon powder particles was about 0.957, and the weight percentage (T/C) of the carbon powder particles was 7%. Experimental Example: Measurement of Frictional Charge of Carbon Particles The development compositions prepared in the above Examples 1-8 and Comparative Examples 1-4 were placed in a ball mill and uniformly mixed, the mixing time was 10 minutes, and the mixing speed 15 was 70 rpm. The image-mixed composition of 0.3 to 0.5 gm was placed in a Faraday cage, and the frictional charge amount (q/m) of the toner particles in the developing composition was measured in a bowl-off manner. The experimental results are shown in Table 1 below: Powder particle roundness Carbon particle weight percentage Friction charge T/C (%) q/m (β C/gm) Example 1 0.957 1 15.1 Example 2 0.957 3 16.2 Example 3 0.957 5 18.2 Example 4 0.957 7 14.7 Example 5 0.964 1 21.6 12 201009523 Example ό ~093⁄4 - ----- 3 22.4 Example 7 0.964 5 19.8 Example 8 0.964 7 15.8 Ratio Case 1 0.911 1 24.5 Comparative Example 2 ~ 〇 911 3 17.3 Comparative Example 3 IW Λ ^0911 ?Γ7Γ;-----,. 5 14.7 0.911 7 9.8 5 10 ❹ Figure 1 is the examples 1 to 8 and Comparative Examples 1 to 4, The relationship between the weight percentage of toner (T/C) and the amount of frictional charge (q/m). As shown in Fig. ,, when the toner particle roundness is 957.957 (Examples 1 to 4) or 0.964 (Examples 5 to 8), the change in the triboelectric charge amount is relatively stable. In contrast, the comparative example 丨~4 has a toner particle roundness of 0_911, and its triboelectric charge has a significant change depending on the weight percentage of the carbon powder particles in the developing composition. As described above, in the developing composition of the present invention, since the shape of the carbon powder particles is closer to a circular shape, the contact area between the carbon powder particles and the carrier can be increased, and the frictional charge amount of the carbon ruthenium particles can be maintained in a stable state. Therefore, the developing composition of the present invention can improve the situation in which the developing composition of the toner is irregular due to the irregularity of the surface of the toner. Therefore, in the developing composition of the present invention, the frictional charge amount of the carbon powder particles is less affected by the concentration of the carbon powder particles, so that the printing quality for a long time of printing can be maintained. The above embodiments are merely exemplified for convenience of explanation, and the right (4) claimed by the present invention is based on the scope of the patent application, and is not limited to the above embodiment. 13 15 201009523
【圖式簡單說明】 圖1係本發明之碳粉粒子重量百分比與摩擦帶電量之關係 圖。 【主要元件符號說明】 無。 14BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a graph showing the relationship between the weight percentage of carbon powder particles and the amount of frictional charge of the present invention. [Main component symbol description] None. 14