200904912 九、發明說明： 【發明所屬之技術領域】 本發明係有關於一種墨水組合物，且特別是有關於一 種喷墨裝置用之墨水組合物。 【先前技術】 喷墨列印技術迄今已發展多年，其具有價格低、噪音 低，且可提供不錯的全色系列印品質之優點，並可使用一 般紙張、特殊列印專用紙及專用投影片等不同之載體。 一般噴墨墨水依型態大致可分為水性墨水(water base ink)和油性墨水(oil base ink)。一般來說，使用水性墨水印 刷之圖案耐水性較差，反之，使用油性墨水印刷之圖案可 提供優良的而ί水性及时光性之優點。 對於彩色喷墨列印而言，一較佳之墨水組合，其墨水 特性及印刷品質通常必需符合下面幾點要求： (1) 墨水喷墨於載體上時，不會有羽化（feathering)和暈 開（bleeding)現象產生。 (2) 墨水喷墨於載體上時，具有快的乾燥速度。 (3) 墨水喷墨於載體上後，喷墨喷嘴口（nozzle)不會產生 阻塞（clogging)現象。 (4) 所使用的喷墨墨水需具有良好的儲存穩定度 (storage stability)。 0535-A22200TWF(N2)；A07045；WAYNE 5 200904912 (5) 所使用的喷墨墨水在紙上，有良好的文字辨識度及 解析度表現。 (6) 所使用的喷墨墨水需具有無毒之安全性（safe)。 然而，將傳統油性墨水以熱氣泡式喷墨印表機(thermal bubble inkjet printer)進行列印，要達到上述的第5項目標 是不容易的，大部分的油性墨水在熱氣泡式墨頭（thermal bubble printer head)上進行列印時，常有列印品質不佳、圖 片模糊之情形。此是因為油性墨水除油性染料（oil soluble dye)為固定成份(solid content)外，大部分為樹脂(resin)有機 溶劑（solvent)、添加劑（additive)等液態溶液，因此油性墨 水内存在大量的溶劑，當熱氣泡式喷墨嘴(nozzle)内之加熱 器（heater)運作生熱，使墨水自身沸騰而產生氣泡，利用氣 泡的壓力，迫使墨水由喷嘴射出，由於溶劑性之墨水在熱 氣泡式喷墨頭内不容易起泡(bubbling)，如此使得含大量溶 劑之油性墨水列印品質相對不佳。 【發明内容】 根據上述問題，本發明之目的為提供一種油性墨水組 合物，可以熱氣泡式喷墨印表機列印出良好之列印品質。 本發明提供一種喷墨裝置用之墨水組合物，包括添加 去離子水之油性墨水(oil-based ink)，其中油性墨水至少包 括一可溶於油性（oil soluble)之色料和一有機溶劑。在本發 0535-A22200TWF(N2)；A07045；WAYNE 6 200904912 明之一貫施例中，有機溶劑佔墨水組合物之3〇%〜9〇%，去 離子水佔墨水組合物之〇.1%〜35%。本發明之墨水組合物 可包括殺菌劑、酸鹼緩衝液和溶劑蒸發抑制劑，但較佳不 包括界面活性劑（Surfactant)和合成樹脂（Resin)。 【實施方式】 以下詳細討論本發明較佳實施例，然而，根據本發明 之概念，其可包括或運用於更廣泛之技術範圍。須注意的 是，實施例僅用以揭示本發明製造和使用之特定方法，並 不用以限定本發明。 以下討論本發明一實施例喷墨裝置用之墨水組合物， 其係於油性墨水（〇il_based ink)中添加去離子水（D.I. water)，油性墨水係以可溶於油性（〇il s〇luble)之色料和有 機溶制為主體，其中有機溶劑可佔墨水組合物之 30%〜90%，有機溶劑較佳佔墨水組合物之5〇%〜9〇%。在本 發明一實施例中，去離子水之較佳含量為，去 離子水之更佳含量為3%〜30%。 有機/谷劑較佳為有極性之溶劑，例如乙醇（ε^&η〇ι)、曱 醇（methano1)、二甲基甲醢胺（dimethylformamide，DMF)或 乙醚（ethyl ether)。油性之色料可包括油性染料（〇il s〇luble dye)及顏料(pigment)。油性染料與溶劑的相容性較佳，而 使付列印後圖案的防水性表現理想，顏料不論在色彩的亮BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink composition, and more particularly to an ink composition for an ink jet device. [Prior Art] Inkjet printing technology has been developed for many years, and it has the advantages of low price, low noise, and can provide good full-color series printing quality, and can use general paper, special printing special paper and special slide film. Different carriers. Generally, inkjet inks can be roughly classified into water base inks and oil base inks. In general, patterns using aqueous ink prints have poor water resistance. Conversely, patterns printed with oil-based inks provide excellent water-based and light-time properties. For color inkjet printing, a better ink combination, its ink characteristics and print quality usually have to meet the following requirements: (1) When the ink is inked on the carrier, there will be no feathering and blooming. (bleeding) phenomenon occurs. (2) When the ink is ejected onto the carrier, it has a fast drying speed. (3) The ink jet nozzle opening does not cause clogging after the ink is ejected onto the carrier. (4) The inkjet ink used must have a good storage stability. 0535-A22200TWF(N2);A07045;WAYNE 5 200904912 (5) The inkjet ink used has good text recognition and resolution on paper. (6) The inkjet ink used must have a non-toxic safety. However, it is not easy to achieve the above-mentioned fifth objective by printing a conventional oil-based ink with a thermal bubble inkjet printer. Most of the oil-based ink is in a thermal bubble type ink head ( When printing on the thermal bubble printer head), there are often cases where the print quality is poor and the picture is blurred. This is because the oil soluble ink is a solid content, and most of them are liquid solutions such as resin, additive, and the like. Therefore, there are a large amount of oily ink in the ink. The solvent, when the heater in the hot bubble type nozzle operates to generate heat, causes the ink to boil itself to generate bubbles, and uses the pressure of the bubble to force the ink to be ejected from the nozzle due to the solvent-like ink in the hot bubble. The inkjet head does not easily bubbling, so that the oily ink containing a large amount of solvent is relatively poor in print quality. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an oil-based ink composition which can print a good print quality by a thermal bubble type ink jet printer. The present invention provides an ink composition for an ink jet device comprising an oil-based ink to which deionized water is added, wherein the oil-based ink comprises at least an oil soluble coloring matter and an organic solvent. In the consistent embodiment of the present invention, the organic solvent accounts for 3〇% to 9〇% of the ink composition, and the deionized water accounts for 〇1% to 35% of the ink composition. %. The ink composition of the present invention may include a bactericide, an acid-base buffer, and a solvent evaporation inhibitor, but preferably does not include a surfactant (Surfactant) and a synthetic resin (Resin). [Embodiment] The preferred embodiments of the present invention are discussed in detail below, however, in accordance with the concepts of the present invention, it may include or be applied to a broader technical scope. It is to be understood that the examples are not intended to limit the invention. The ink composition for an ink-jet apparatus according to an embodiment of the present invention is described below, which is characterized in that deionized water (DI water) is added to an oil-based ink, and the oil-based ink is soluble in oiliness (〇il s〇luble). The coloring material and the organic solvent are mainly composed, wherein the organic solvent may account for 30% to 90% of the ink composition, and the organic solvent preferably accounts for 5% to 9% by weight of the ink composition. In an embodiment of the invention, the preferred content of deionized water is a preferred content of deionized water of from 3% to 30%. The organic/treat agent is preferably a polar solvent such as ethanol (ε^&η〇ι), methano1, dimethylformamide (DMF) or ethyl ether. Oily colorants may include oily dyes and pigments. The compatibility of the oily dye with the solvent is better, and the water resistance of the post-printing pattern is ideal, and the color of the pigment is bright.
0535-A22200TWF(N2)；A07045；WAYNE 7 200904912 度、色相和彩度上都不及染料來的色彩鮮豔，而且顏料顆 粒尺寸較大’又不容易均勻分散在溶液中時’需配合有效 的分散劑（dspersant)及附著劑（binder)來改善凝結產生沉澱 所造成墨水匣喷頭的阻塞的問題。因此，在本發明之較佳 實施例中’在色料的選擇是以色彩鮮豔且具高度防水性之 油性染料為較佳。請注意，本發明色料雖然較佳為油性染 料’但本發明不限於此，其亦可以為顏料(較佳添加分散劑 及附著劑），或其它色料。 在本發明一實施例中，油性染料可包括黃色、紅色、 藍色、黑色、青綠色（cyan)和洋紅色（magenta)，舉例來說， 黃色之油性染料可以是Orient Chemical公司所生產之Oil Yellow 129、Oil Yellow 3G、Oil Yellow 1101、Oil Yellow 1105。紅色之油性染料可以是Orient Chemical公司所生產 之 Oil Red 5B、Oil Red RR、Valifast Red 1306。藍色之油 性染料可以是Orient Chemical公司所生產之Oil Blue 613、Oil Blue 2N、Oil Blue 1603、Oil Blue BOS。黑色之 油性染料可以是Orient Chemical公司所生產之Oil Black HBB、Oil Black BS、Oil Black 860、Oil Black 1802。請注 意，單一顏色之油性染料個別含量較佳為0.1%〜10%。 另外，本發明之墨水組合物可另添加殺菌劑、酸驗緩 衝液、整合劑、溶劑蒸發抑制劑和/或抗紫外線試劑 (UV-blocker)。在界面活性劑方面，主要功能在於降低溶液 0535-A22200TWF(N2)；A07045；WAYNE 8 200904912 之墨水表面張力（surface tension)，進而可以提升墨水保''了 的功能，使供墨及喷墨順利。在本發明一實施例中可添2 一種以上的界面活性劑，包含陰離子（anionic)型式、陽离隹 子（cationic)型式、非離子（non-ionic)型式，或兩性 (amphoteric)之界面活性劑，其總添加量範圍較佳在2〇 〇% 以下。添佳抗紫外線試劑（UV-blocker)係用以阻擋uv光 之吸收進而增進色料的抗光性。添加殺菌劑，係用以抑制 細菌在墨水中滋長。添加分散劑，係用以增加添加物在黑 水中的分散能力。添加整合劑係用以防止結晶鹽類的產 生，造成凝集顆粒而阻塞墨水匣之喷頭。酸鹼緩衝溶液的 添加’係使色料維持於適當酸驗值(pH value)範圍内，以顯 出理想之色系。 此外，本發明之墨水組合物較佳不含樹脂及界面活性 劑，其中不加樹脂是防止樹脂遇熱時產生膠狀而黏固噴孔 造成阻塞。 以下揭示本發明一實驗，將實驗組(example)搭配不同 百分比的去離子水於油性墨水中，並與對照組(comparative example)之傳統配方無添加去離水做一列印品質的差別比 較0 實驗流程：本實驗所使用之喷墨列表機為一般熱氣泡 式喷墨印表機，本實驗所使用的纸張為一般素面紙張(Plan 0535-A22200TWF(N2)；A07045； WAYNE 9 200904912 paper)，且本所使用之噴墨頭起始列印溫度為室溫。本實驗 以各實施例之配方，列印品質對照表（KPH chart)—張，比 較列印品質’以觀察加入不同比例之去離子水於油性墨水 中’隨著去離子水的添加量對列印品質之影響。 本實驗所所列印的品質對照表上所顯現的測試項目如 下所述： 1. 喷墨量（ink Loading) 喷墨量之分佈均勻度及密實度表現作比較。 2. 贺墨頻率（inkjet Frequency) 當施加喷墨頻率為5khz時之喷墨清晰度比較。 3_文字清晰度（writing dots clearness) 文字清晰度、辨識度在紙張上的表現比較。 4.顏色對比（color contrast) 顏色在白色紙張上之對比表現作比較。 實驗組 色料：油性染料(Orient公司所生產之ValifastRed3320) _____ 5.5% 有機溶劑：甲醇Methyl alcohol 83% 有機溶劑：二丙二醇單甲 _ dipropylene glycol monomethyl 9% ether 殺菌劑 0.5% 去離子水 2% — 0535-A22200TWF(N2)；A07045； WAYNE 10 200904912 貫驗組二 色料.油性染料(Orient公司所生產之ValifastRed332〇) 5.5% 有機溶劑：曱醇Methyl alcohol 81.4% 有機溶劑：二丙二醇單曱醚 dipr〇pyleneglyedmQn()methyl ether 9% 殺菌劑 0.5% 去離子水 3.6% 貫驗組二 色料：油性染料(Orient公司所生產之ValifastRed332〇) 5.0% 有機溶劑：曱醇Methyl alcohol 79.6% 有棧洛实彳.一丙一醇单曱 _1 dipropylene glycol monomethyl ether 8% 殺菌劑 0.5% 去離子水 6.9% 實驗組四 色料：油性染料(Orient公司所生產之vaiifastRed3320) 43% 有機溶劑：甲醇Methyl alcohol 70.5% 有機 /谷劑· 一 丙一醇早甲鱗 dipropylene glycol monomethyl ether 8% 殺菌劑 0.5% 去離子水 16.7% 0535^A22200TWF(N2)；A07045；WAYNE 11 200904912 貫驗組五 色料·油性染料(Orient公司所生產之ValifastRed332⑺ 5.0% 有機溶劑：甲醇Methyl alcohol 66.5% 有機/谷劑.—丙一醇單甲喊 dipropylene glycol monomethyl 8% ether 殺菌劑 0.5% 去離子水 20% 對照組一 色料：油性染料(Orient公司所生產之ValifastRed3320) 8.5% 有機溶劑：甲醇Methyl alcohol 82% 有機溶劑：二丙二醇單甲醚 dipropylene glycol monomethyl ether 9% 殺菌劑 0.5% 實驗結果(1 客1表） 喷墨量 喷墨頻率 文字清晰度 顏色對比 實驗組一 Δ Δ Δ △ 實驗組二 〇 △ Δ △ 貫驗組三 〇 △ 〇 △ 實驗組四 〇 〇 〇 Δ 0535-A22200TWF(N2)；A07045；WAYNE 12 2009049120535-A22200TWF(N2);A07045;WAYNE 7 200904912 Degree, hue and chroma are not as bright as dyes, and the pigment particles are large in size, and it is not easy to disperse evenly in solution. (dspersant) and binder to improve the problem of clogging of the ink jet head caused by condensation. Therefore, in the preferred embodiment of the present invention, the selection of the colorant is preferably an oily dye which is bright and highly water-repellent. Note that although the coloring material of the present invention is preferably an oily dye', the present invention is not limited thereto, and it may also be a pigment (preferably adding a dispersing agent and an attaching agent), or other coloring materials. In an embodiment of the invention, the oily dye may include yellow, red, blue, black, cyan, and magenta. For example, the yellow oily dye may be Oil Yellow produced by Orient Chemical. 129, Oil Yellow 3G, Oil Yellow 1101, Oil Yellow 1105. The red oily dye may be Oil Red 5B, Oil Red RR, and Valifast Red 1306 produced by Orient Chemical. The blue oily dye may be Oil Blue 613, Oil Blue 2N, Oil Blue 1603, Oil Blue BOS manufactured by Orient Chemical Company. The black oily dye may be Oil Black HBB, Oil Black BS, Oil Black 860, Oil Black 1802 produced by Orient Chemical Company. Please note that the individual content of the oil dye of a single color is preferably from 0.1% to 10%. Further, the ink composition of the present invention may be additionally added with a bactericide, an acid buffer, an integrator, a solvent evaporation inhibitor, and/or a UV-blocker. In terms of surfactants, the main function is to reduce the surface tension of the solution 0535-A22200TWF (N2); A07045; WAYNE 8 200904912, which can improve the function of the ink to make the ink supply and inkjet smooth. . In one embodiment of the invention, more than one surfactant may be added, including anionic, cationic, non-ionic, or amphoteric interface activity. The total addition amount of the agent is preferably in the range of 2% or less. The UV-blocker is used to block the absorption of uv light and enhance the light resistance of the colorant. A fungicide is added to inhibit the growth of bacteria in the ink. A dispersant is added to increase the dispersibility of the additive in black water. An integrator is added to prevent the formation of crystalline salts, causing agglomerated particles to block the nozzles of the ink cartridges. The addition of the acid-base buffer solution maintains the colorant within the appropriate pH value to reveal the desired color system. Further, the ink composition of the present invention is preferably free of a resin and a surfactant, wherein no resin is added to prevent the resin from being gelatinized when it is heated, and the nozzle is stuck to cause clogging. The following is an experiment of the present invention. The experimental group is matched with different percentages of deionized water in an oily ink, and compared with the conventional formula of the control example without adding water to make a difference in printing quality. 0 Experimental procedure The inkjet list machine used in this experiment is a general thermal bubble type inkjet printer. The paper used in this experiment is general plain paper (Plan 0535-A22200TWF(N2); A07045; WAYNE 9 200904912 paper), and The ink jet head used in the present invention starts printing at room temperature. In this experiment, according to the formula of each example, print the quality comparison table (KPH chart)-sheet, compare the printing quality 'to observe the addition of different proportions of deionized water in the oily ink' with the addition amount of deionized water The impact of print quality. The test items appearing on the quality comparison table printed in this experiment are as follows: 1. Ink Injection The distribution uniformity and density performance of the ink ejection amount are compared. 2. inkjet frequency (inkjet frequency) The inkjet sharpness comparison when the inkjet frequency is applied at 5khz. 3_writing dots clearness The comparison of text clarity and recognition on paper. 4. Color contrast The contrast of colors on white paper is compared. Experimental group color: oily dye (ValifastRed3320 produced by Orient) _____ 5.5% organic solvent: methanol Methyl alcohol 83% organic solvent: dipropylene glycol monomethyl _ dipropylene glycol monomethyl 9% ether bactericide 0.5% deionized water 2% — 0535-A22200TWF(N2);A07045; WAYNE 10 200904912 Two-color material of the inspection group. Oily dye (ValifastRed332〇 produced by Orient) 5.5% Organic solvent: Methyl alcohol 81.4% Organic solvent: Dipropylene glycol monoterpene ether dipr 〇pyleneglyedmQn()methyl ether 9% Fungicide 0.5% Deionized water 3.6% Cross-spectrum two-color: oily dye (ValifastRed332〇 produced by Orient) 5.0% Organic solvent: sterol Methyl alcohol 79.6%彳. monopropanol mono _1 dipropylene glycol monomethyl ether 8% fungicide 0.5% deionized water 6.9% experimental group four color materials: oily dyes (vaiifastRed3320 produced by Orient) 43% organic solvent: methanol Methyl alcohol 70.5 % organic / gluten · monopropanol dipropylene glycol monomethyl ether 8% fungicide 0.5% deionized 16.7% 0535^A22200TWF(N2);A07045;WAYNE 11 200904912 Test group five-color oily dye (ValifastRed332 (7) produced by Orient 5.0% organic solvent: methanol Methyl alcohol 66.5% organic / gluten. - propanol monomethyl Shout dipropylene glycol monomethyl 8% ether bactericide 0.5% deionized water 20% control one color: oily dye (ValifastRed3320 produced by Orient) 8.5% organic solvent: methanol Methyl alcohol 82% organic solvent: dipropylene glycol monomethyl ether dipropylene Glycol monomethyl ether 9% Fungicide 0.5% Experimental results (1 guest 1 table) Inkjet inkjet frequency text clarity color contrast experimental group Δ Δ Δ △ experimental group two 〇 Δ △ test group three 〇 △ △ Experimental group four 〇〇〇 Δ 0535-A22200TWF (N2); A07045; WAYNE 12 200904912
貫驗組五 ◎ 〇 ◎ 〇 對照組一 X X X V ◎:整體表現最佳 〇：整體表現次佳 △:整體表現正常 ▽:整體表現不佳 X:整體表現最差 根據以上實驗結果（第1表）可發現，在一定比例内，當 添加物的去離子水越多時，列印品質相對變好。 因此，根據本發明上述實施例，於油性墨水中添加去 離子水，可提高墨水在喷墨頭内之起泡率，產生較佳的喷 墨壓力，提升列印品質。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何熟習此技藝者，在不脫離本發明之精神 和範圍内，當可作些許之更動與潤飾。因此，本發明之保 護範圍，當視後附之申請專利範圍所界定者為準。 0535-A22200TWF(N2)；A07045；WAYNE 13 200904912 【圖式簡單說明】 無。 【主要元件符號說明】 益。 ό、 0535-A22200TWF(N2)；A07045；WAYNE 14The inspection group five ◎ 〇 ◎ 〇 control group XXXV ◎: the overall performance is the best 〇: the overall performance is second best △: the overall performance is normal ▽: the overall performance is poor X: the overall performance is the worst according to the above experimental results (Table 1) It can be found that, within a certain ratio, the more the deionized water of the additive, the better the print quality. Therefore, according to the above embodiment of the present invention, the addition of deionized water to the oily ink can increase the foaming rate of the ink in the ink jet head, produce a better ink jet pressure, and improve the printing quality. While the invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and may be modified and modified by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention is defined by the scope of the appended claims. 0535-A22200TWF(N2); A07045; WAYNE 13 200904912 [Simple description of the diagram] None. [Main component symbol description] Benefit. ό, 0535-A22200TWF(N2); A07045; WAYNE 14