CN101302369B - Ink set, ink jet recording method, and recording method - Google Patents

Abstract

An ink set is provided which can suppress bleeding irrespective of the type of recording medium. The ink set includes a plurality of aqueous inks each containing a dye, and has at least a first aqueous ink containing a dye, wherein the difference between the dynamic surface tension of the first aqueous ink at a lifetime of 50 milliseconds and the dynamic surface tension of the first aqueous ink at a lifetime of 500 milliseconds is 7 mN/m or more; and, between the first aqueous ink and at least one type of aqueous ink except the first aqueous ink included in the ink set, dynamic surface tension gammaa (mN/m) of an ink A having relatively higher lightness at a lifetime of 500 milliseconds and dynamic surface tension gammab (mN/m) of an ink B having relatively lower lightness at a lifetime of 500 milliseconds satisfy -5<=(gammaa-gammab)<=3.

Description

Complete China ink and ink jet recording method

Technical field

The present invention relates to aqueous ink, complete China ink, ink jet recording method, print cartridge, record cell and ink jet recording device.

Background technology

In recent years, require to improve the especially picture quality on the common paper of the recording medium that is formed on by ink jet recording method, particularly, the particularly gradation of image or color homogeneity.For example, can improve gradation by the area that reduces a single point that on recording medium, forms by China ink.On the contrary, when the area of described a single point was big, a plurality of points tended to together connected to each other, even when the China ink amount of using when per unit area increases or reduces like this, perhaps all can not accurately control the surface-area with the black recording medium that is coated with.In addition, a plurality of points tend to together connected to each other, occur the flushing (blurring) of China ink so sometimes on recording medium easily.

For head it off, proposed to be suppressed at the flushing of China ink on the recording medium by the static surface tension (so-called " surface tension ") that increases China ink.For example, proposed by with China ink 20 ℃ surface tension be set at 45mN/m with on suppress the proposal of the flushing (referring to Japanese Patent Application Laid-Open S63-213581) of China ink.Also proposed by the surface tension with China ink be set at 40mN/m with on suppress the proposal of flushing (referring to Japanese Patent Application Laid-Open No.2004-83621) of China ink.

In addition, proposed to focus on the proposal of the dynamic surface tension of China ink, with act on control example such as China ink on recording medium or in the recording medium flushing or the technology of infiltration.For example, following proposal (referring to Japanese Patent Application Laid-Open No.H09-296139) has been proposed: the surface tension of the China ink by will being in the bubble period T (second/bubble) below 0.2 be set at 40mN/m with on suppress the flushing of China ink, and the surface tension of the China ink by will being in the bubble period T (second/bubble) greater than 1 is set at less than 50mN/m and improves black injection reliability.

The also following proposal of proposition (referring to Japanese Patent Application Laid-Open No.2003-231838): be set at 100mPas by dried viscosity (dry viscosity) and improve the injection reliability of China ink, and stipulated black dynamic surface tension characteristic in the specific life-span to get off with China ink.Specifically, in described file, described by will be set at the dynamic surface tension of the China ink in 10 milliseconds of life-spans 45mN/m with on suppress the flushing of China ink, and improve the rapid drying performance of China ink to get off by being set at 35/m at the dynamic surface tension of the China ink in 1,000 millisecond of life-span.

In addition, proposed to focus on the proposal that fasten the pass between the dynamic surface tension of the multiple China ink of forming complete China ink, it is with acting on control example such as the flushing of distinct colors on common paper or the technology of infiltration (referring to Japanese Patent Application Laid-Open No.2006-63322).That is to say, by black, yellow, in the complete China ink that magenta and cyan ink are formed, life-span identical in the dynamic surface tension that is defined in various China inks under 25 ℃ of temperature and 30 milliseconds to the 1000 milliseconds life span that are in by maximum bubble pressure method is as follows: the dynamic surface tension of (1) yellow ink is equal to or greater than the dynamic surface tension of black ink, (2) the dynamic surface tension difference between yellow ink and black ink is below the 5mN/m, (3) dynamic surface tension between yellow ink and magenta ink is poor, and the dynamic surface tension difference between yellow ink and cyan ink respectively is more than the 3mN/m, and every kind dynamic surface tension of (4) magenta ink and cyan ink is lower than the dynamic surface tension of black ink.In described file, the detailed description that prevents the boundary portion intermingling of distinct colors between them on common paper has been described.

Summary of the invention

Yet, as Japanese Patent Application Laid-Open No.S63-213581 cited above and each described invention of Japanese Patent Application Laid-Open No.2004-83621, the static surface tension that only increases China ink can not suppress the flushing of China ink sometimes, perhaps can not make the surface of recording medium moistening equably, reduce the color homogeneity of image so sometimes.In addition, the increase of black static surface tension can reduce the perviousness of China ink within the recording medium, and China ink is finished and infiltrated through recording medium and need take a long time like this, produces China ink thus sometimes and moves etc.

In addition, in each described invention of Japanese Patent Application Laid-Open No.H09-296139 cited above, Japanese Patent Application Laid-Open No.2003-231838 and Japanese Patent Application Laid-Open No.2006-63322, attempted being primarily focused on the dynamic surface tension aspect of change China ink to control the flushing or the infiltration of China ink.Yet, the research that the present inventor carries out shows, when common paper or its analogue during as recording medium, all can not be kept the homogeneity of color in the image in the gradation that improves image about the explanation of dynamic surface tension in Japanese Patent Application Laid-Open No.H09-296139, Japanese Patent Application Laid-Open No.2003-231838 and Japanese Patent Application Laid-Open No.2006-63322.In other words, also there is not to occur to form the China ink of such ideal point as described below, wherein when common paper or its analogue during as recording medium, can be controlled at the transversely diffusion (gradation) and the color homogeneity (the surface change of recording medium being wet with China ink) of China ink rightly.

Consider foreground, the present inventor studies the China ink that can address the above problem, promptly when with common paper or its analogue as recording medium and rightly during the dynamic surface tension of control China ink, be primarily focused on the performance of China ink during certain, be administered to the recording medium beginning and finish with China ink that to infiltrate through recording medium be end from China ink during this period.Thereby, even have been found that when with common paper or its analogue during as recording medium, China ink also can provide under the excellent images situation, also new problem will occur when described China ink is used for complete China ink.Specifically, have been found that when the complete China ink that comprises described China ink by use forms image on the recording medium that for example has black receiving layer the bleeding (bleeding) that does not have to take place but occurs with unexpected obviously state on the such recording medium of for example common paper.

Therefore, first purpose of the present invention provides complete China ink, and it comprises the China ink with controlled dynamic surface tension, and described complete China ink can be suppressed at the bleeding on the recording medium that for example has black receiving layer.In addition, second purpose of the present invention provides complete China ink, it comprises that described complete China ink can be suppressed at the bleeding on the recording medium that for example has black receiving layer when common paper or its analogue can be improved the aqueous ink that gradation keeps color homogeneity simultaneously during as recording medium.In addition, another object of the present invention provides ink jet recording method, print cartridge, record cell and the ink jet recording device that uses the aqueous ink of forming described complete China ink separately.In addition, another object of the present invention provides aqueous ink, and it is used for being suppressed at the complete China ink of the bleeding on the recording medium that for example has black receiving layer.

Above-mentioned purpose can realize by the invention of following introduction.That is to say that complete China ink according to the first embodiment of the present invention is the complete China ink that comprises multiple aqueous ink, described multiple aqueous ink comprises dyestuff separately, and wherein: described complete China ink has first aqueous ink that comprises dyestuff at least; First aqueous ink is more than the 7mN/m in the dynamic surface tension and the difference of first aqueous ink between the dynamic surface tension in 500 milliseconds of life-spans in 50 milliseconds of life-spans; And, in first aqueous ink be included between at least a aqueous ink except that first aqueous ink in the described complete China ink, have the dynamic surface tension γ of the black A of relative higher brightness 500 milliseconds of life-spans _a(mN/m) and have the dynamic surface tension γ of the black B of relatively low brightness 500 milliseconds of life-spans _b(mN/m) satisfy relation :-5≤(γ _a-γ _b)≤3.

In addition, the complete China ink of second embodiment according to the present invention comprises multiple aqueous ink, and described multiple aqueous ink comprises dyestuff separately, and wherein: described complete China ink has first aqueous ink that comprises dyestuff at least; Described first aqueous ink meets the following conditions (1) to (3): (1) is extremely less than 49/m more than the 42mN/m at the dynamic surface tension in 50 milliseconds of life-spans, (2) the dynamic surface tension in 500 milliseconds of life-spans be more than the 28mN/m to 38mN/m, and (3) dynamic surface tension and difference between the dynamic surface tension in 500 milliseconds of life-spans 50 milliseconds of life-spans is more than the 7mN/m; And, in first aqueous ink be included between at least a aqueous ink except that first aqueous ink in the described complete China ink, have the dynamic surface tension γ of the black A of relative higher brightness 500 milliseconds of life-spans _a(mN/m) and have the dynamic surface tension γ of the black B of relatively low brightness 500 milliseconds of life-spans _b(mN/m) satisfy relation :-5≤(γ _a-γ _b)≤3.

In addition, the complete China ink of third embodiment according to the present invention comprises at least three kinds of aqueous ink that comprise dyestuff separately, and wherein: described complete China ink has first aqueous ink that comprises dyestuff at least; Described first aqueous ink meets the following conditions (1) to (3): (1) is extremely less than 49mN/m more than the 42mN/m at the dynamic surface tension in 50 milliseconds of life-spans, (2) the dynamic surface tension in 500 milliseconds of life-spans be more than the 28mN/m to 38mN/m, and (3) dynamic surface tension and difference between the dynamic surface tension in 500 milliseconds of life-spans 50 milliseconds of life-spans is more than the 7mN/m; And, at least three kinds of aqueous ink from be included in complete China ink, in any select any two kinds of aqueous ink, have the dynamic surface tension γ of the black A of relative higher brightness 500 milliseconds of life-spans _a(mN/m) and have the dynamic surface tension γ of the black B of relatively low brightness 500 milliseconds of life-spans _b(mN/m) satisfy relation :-5≤(γ _a-γ _b)≤3.

In addition, according to the ink jet recording method of another embodiment of the invention, it comprises that wherein said China ink comprises the aqueous ink of forming described complete China ink by ink ejecting method injection China ink.

In addition, according to the print cartridge of another embodiment of the invention, it comprises the black reservoir that is used to store China ink, wherein is contained in China ink in the described black reservoir and is any of the aqueous ink of forming described complete China ink.

In addition, according to the record cell of another embodiment of the invention, it comprises the record-header that is used to store the black reservoir of China ink and is used to spray China ink, and the China ink that wherein is contained in the described black reservoir comprises the aqueous ink of forming described complete China ink.

In addition, according to the ink jet recording device of another embodiment of the invention, it comprises the record-header that is used to store the black reservoir of China ink and is used to spray China ink, and the China ink that wherein is contained in the described black reservoir comprises the aqueous ink of forming described complete China ink.

In addition, China ink according to another embodiment of the invention is first aqueous ink, it comprises dyestuff and is used to have the complete China ink of the multiple aqueous ink that comprises dyestuff separately, wherein, first aqueous ink is more than the 7mN/m in the dynamic surface tension and the difference of first aqueous ink between the dynamic surface tension in 500 milliseconds of life-spans in 50 milliseconds of life-spans; And, in first aqueous ink be included between at least a aqueous ink except that first aqueous ink in the described complete China ink, have the dynamic surface tension γ of the black A of relative higher brightness 500 milliseconds of life-spans _a(mN/m) and have the dynamic surface tension γ of the black B of relatively low brightness 500 milliseconds of life-spans _b(mN/m) satisfy relation :-5≤(γ _a-γ _b)≤3.

According to the present invention, complete China ink is provided, it comprises the China ink with controlled dynamic surface tension, described complete China ink can be suppressed at the bleeding in the recording medium that for example has black receiving layer.In addition, according to the present invention, the complete China ink that comprises aqueous ink is provided, when with common paper or its analogue during as recording medium described aqueous ink can improve gradation and keep color homogeneity simultaneously, described complete China ink can be suppressed at the bleeding in the recording medium that for example has black receiving layer.In addition, the present invention can provide print cartridge, record cell and the ink jet recording method that uses the aqueous ink of forming described complete China ink separately.In addition, the present invention can provide aqueous ink, and it is used for being suppressed at the complete China ink of the bleeding of the recording medium that for example has black receiving layer.

With reference to accompanying drawing, from the description of following exemplary, further feature of the present invention will become apparent.

Description of drawings

Fig. 1 is the mode chart that is formed for estimating the image of bleeding.

Fig. 2 is a kind of skeleton view of ink jet recording device.

Fig. 3 is the skeleton view of the mechanical part of described ink jet recording device.

Fig. 4 is the sectional view of described ink jet recording device.

The skeleton view of the state when Fig. 5 shows print cartridge and is installed on the head cartridge.

Fig. 6 is the decomposition diagram of described head cartridge.

Fig. 7 shows the front view of the recording element substrate in described head cartridge.

Embodiment

Hereinafter, will the present invention be described in more detail by being used to carry out best mode of the present invention.Should be noted that in the following description aqueous ink is also referred to as " China ink ", and first aqueous ink is also referred to as " first China ink ".In addition, the term that uses among the present invention " bleeding " is meant, when by the image that uses the multiple China ink that in the complete China ink of water-based, comprises dyestuff separately to form when adjacent one another are, and the bleeding of not expecting that boundary member occurs between these images.

At first, the maximum bubble pressure method that uses during the dynamic surface tension in measuring the present invention is following method.Particularly, described maximum bubble pressure method is a kind of like this method, and it comprises: measurement is used to discharge the necessary peak pressure of bubble, the tip portion of the probe (kapillary) of described bubble formation in being dipped in measured liquid; Peak pressure is determined surface tension thus.The described life-span (surface age) is meant, when the tip portion at probe formed bubble, the time point that forms new bubble surface from previous bubble from tip portion after the release began the time of the time point (radius-of-curvature of bubble becomes the time point of the radius that equals the probe tip part) to largest air bubbles pressure in maximum bubble pressure method.In addition, the dynamic surface tension among the present invention is the value of measuring in the time of 25 ℃.

First purpose of various details promptly comprises the complete China ink of the China ink with controlled dynamic surface tension by use, suppress the bleeding that significantly occurs when forming image on the recording medium that for example has black receiving layer.The present inventor variously is prepared into each other on the dynamic surface tension variation characteristic China ink inequality above-mentioned bleeding is studied by using.Thereby the contriver has been found that by use and comprises the black complete China ink with some dynamic surface tension characteristic, can occur bleeding significantly when form image on the recording medium that for example has black receiving layer.Specifically, the contriver has been found that, when the variation of the dynamic surface tension of China ink included in the complete China ink reaches big like this degree, be that dynamic surface tension and described China ink the difference the dynamic surface tension in 500 millisecond life-spans between of described China ink 50 milliseconds of life-spans is more than the 7mN/m, the bleeding meeting occurs with the tangible state of accident.

People are known usually to be, should make the static surface tension homogenizing of multiple China ink, so that China ink is mutually the same on the perviousness that enters within the recording medium.Thereby in fact can suppress bleeding.Yet when the China ink that dynamic surface tension is had bigger variation was used for complete China ink with these China inks with static surface tension of homogenizing, bleeding occurred significantly when forming image on the recording medium with black receiving layer.Consider foreground, the present inventor studies the reason that occurs bleeding on the recording medium that for example has black receiving layer especially significantly.

To the mechanism that bleeding occurs be discussed.Because there are a large amount of bigger spaces on common paper, the surface of described common paper becomes wet by using of China ink, and China ink is absorbed in the described space thus, and the motion of described China ink is limited to a certain extent.Therefore, when common paper or its analogue during as recording medium, are had only limited influence in many relationship with physical properties of multiple China ink to bleeding.In other words, when with common paper or its analogue during as recording medium, the wetting properties between in the multiple China ink that constitutes complete China ink every kind and the common paper, and the flushing degree of determining every kind of China ink rightly are very important for suppressing bleeding.

On the other hand, the recording medium with black receiving layer has very little space, and described space exists with the form of pore, therefore by capillary action China ink takes place and infiltrates the recording medium with black receiving layer.Situation about occurring when therefore, the phenomenon that occurs in this case is different from common paper or its analogue as recording medium to a great extent.

The present inventor is to when using the performance of ink of recording medium during certain for example have black receiving layer to study, and is administered on the recording medium from China ink during described, infiltrates recording medium with China ink and finishes.As mentioned above, have in the recording medium of black receiving layer by the infiltration of capillary action China ink.In addition, well-known is that when liquid had enough wetting propertiess for the capillary wall mask, capillary force was directly proportional with the surface tension of described liquid.Consider foreground, normal discovery is pointed as described, and when use for example had the recording medium of black receiving layer, the homogenizing static surface tension that constitutes the multiple China ink of complete China ink enough suppressed bleeding and occurs significantly.Yet, can find above-mentioned model and not be suitable for the complete China ink of the China ink that comprises that its dynamic surface tension changes to a great extent, because in complete China ink, bleeding occurred as mentioned above with the tangible state of accident.

The present inventor has investigated following phenomenon with narration.When China ink infiltrates in the space of the recording medium with black receiving layer, the position that the wall in space contacts with each other in the solution-air interface of China ink and recording medium, in other words, the position of capillary force effect is upgraded at any time during China ink moves.Therefore, the surface tension that applies described capillary force may not be equivalent to the static surface tension of China ink, but is equivalent to the dynamic surface tension of China ink in the specific life-span.Based on such hypothesis, by using the various complete China inks that are included in the China ink that differs from one another on the dynamic surface tension variation characteristic, the life-span that influences the dynamic surface tension of capillary force during the present inventor has moved in the space of the recording medium with black receiving layer China ink is studied.Thereby the contriver has been found that China ink at the dynamic surface tension in 500 milliseconds of life-spans, rather than the static surface tension of China ink, to having overriding influence at that time performance of ink.Specifically, the contriver has been found that between two types the China ink, has China ink than low dynamic surface tension 500 milliseconds of life-spans and flows into and have in the China ink of higher dynamic surface tension 500 milliseconds of life-spans, and bleeding appears in the result.

In other words, when multiple China ink when China ink is not finished the state that infiltrates the recording medium with black receiving layer and is contacted with each other, following phenomenon appears.Specifically, to such an extent as to the China ink that such phenomenon has hypertonicity occurs, the China ink " attraction " that promptly has higher dynamic surface tension 500 milliseconds of life-spans has the China ink than low-permeability, promptly has China ink than low dynamic surface tension 500 milliseconds of life-spans.Like this, bleeding occurs.

Therefore, a kind of Perfected process that suppresses bleeding is two types China ink to be set at the dynamic surface tension in 500 milliseconds of life-spans be equal to each other.Yet, when the difference of two types China inks between 500 milliseconds of life-span dynamic surface tensions very hour, with the naked eye do not observe basically and such bleeding occurs.

Consider foreground, the present inventor is by using various complete China inks, after deliberation in the threshold value of the dynamic surface tension difference in 500 milliseconds of life-spans and the relation between the bleeding degree.Thereby the contriver has been found that the difference of China ink between the dynamic surface tension in 500 milliseconds of life-spans with two types is set at below the 3mN/m, is enough to suppress this bleeding by being observed visually basically.The further research that the present inventor carries out shows, mass colour transfer between (tinge) relation also with the relation that has of bleeding, and represent the brightness in three attributes (form and aspect, brightness and chroma) of the color of tone relevant with the appearance of bleeding to a great extent quantitatively.Specifically, the dynamic surface tension of black A 500 milliseconds of life-spans with higher brightness is expressed as γ _a(mN/m), the dynamic surface tension of black B 500 milliseconds of life-spans with relatively low brightness is expressed as γ _b(mN/m).Under the sort of situation, the contriver has been found that as aforesaid γ _a(mN/m) and aforesaid γ _b(mN/m)-5≤(γ satisfies condition _a-γ _b)≤3 o'clock can suppress bleeding.In the present invention, γ _aAnd γ _b-3≤(γ more preferably satisfies condition _a-γ _b)≤3 ,-3＜(γ perhaps especially preferably satisfies condition _a-γ _b)＜3.

Above mean, can be used for suppressing the threshold value of two types the difference of China ink between the dynamic surface tension in 500 milliseconds of life-spans of bleeding, can change according to the relation of the relative brightness between described two types China ink.This is because the following reasons.Flow into the bleeding that occurs when having than low-light level black than the China ink of higher brightness and be difficult to by being observed visually when having, therefore, the difference increase to a certain extent at the dynamic surface tension in 500 milliseconds of life-spans between the described China ink allows.On the contrary, flow into the bleeding that occurs when having higher brightness black than the China ink of low-light level and be visually noticeable easily, therefore must control to the difference at the dynamic surface tension in 500 milliseconds of life-spans between the described China ink very little when having.

In the present invention, when adopting identical recording medium for described China ink with identical logger task (duty), the brightness that must measure every kind of China ink forming complete China ink.Any recording medium can both be used as described recording medium, as long as described recording medium is applicable to common ink jet recording device and has black receiving layer.Then, on recording medium, form the uniform solid image of amount of application of the various China inks of wherein forming complete China ink by using described China ink, and described image section is carried out colour examining by for example spectrophotometer, can obtain the brightness value of every kind of China ink thus.When forming described solid image, preferably use all surfaces of the China ink of sufficient amount with the coating recording medium.In the present invention, for example PR-101 (being made by Canon Inc.) can be used as the recording medium with black receiving layer.In addition, described colour examining can be used for example spectrophotometer (trade(brand)name: Spectrolino; Make by Gretag Macbeth) finish.In addition, the amount of application preference of various China inks is as being about 10ng in each pixel of 600ppi resolving power.Certainly, the present invention is not limited to aforesaid recording medium, spectrophotometer and black amount of application.

The present inventor is used to suppress the specified conditions of bleeding after deliberation in the present invention.Specifically, the verified following content of contriver, in forming the multiple China ink of complete China ink two kinds, black A and B, between specific phase to brightness relationship, and at the relative particular kind of relationship of described two kinds of China inks between the dynamic surface tension in 500 milliseconds of life-spans.That is to say that the contriver is verified, as long as satisfy specified conditions of the present invention, the bleeding behavior can not depend on: black A that per unit area is used and every kind the amount of black B; China ink A and black B are applied to the order of recording medium; The perhaps quantity of Mo every kind record path.

When two types China inks differ from one another on amount of application to a great extent, for example, when the amount of application of the black B with relatively low brightness during less than the amount of application of the black A with relative higher brightness, by the brightness relationship between black A and the formed image of black B, it is opposite may comparing with two types of China inks situation during each other not than big difference on amount of application.Yet, when the brightness relationship between each image that under above-mentioned predetermined condition, forms according to the many of each black amount of application or when opposite,, with the naked eye can not observe the appearance of bleeding less although determine according to brightness relationship with black A and the corresponding China ink of black B.This is because following reason: very little of a kind of amount of application of China ink, therefore described China ink is finished and is infiltrated also unusual weak point of the required timed interval of recording medium, is difficult to occur bleeding from the beginning.As long as therefore we can say-5≤(γ that satisfies condition _a-γ _b)≤3 just unacceptable bleeding can not occur.

As mentioned above, multiple China ink is the main cause that bleeding occurs in relation between the dynamic surface tension in 500 milliseconds of life-spans and the brightness relationship between the China ink, therefore needn't consider form and aspect or chroma relation between the multiple China ink.In other words, the multiple China ink that is used to suppress bleeding of the present invention's regulation also is applicable to various China inks similarly in relation between the dynamic surface tension in 500 milliseconds of life-spans and the brightness relationship between the China ink.That is to say that explanation of the present invention is applicable to every kind of for example black, redness, green, blueness, light cyan, shallow magenta and grey China ink, and cyan, magenta and yellow ink every kind that is used for common ink-jet recording system.In addition, explanation of the present invention also is applicable to and for example is used for improving for example brilliance of image and the transparent China ink (clear ink) of fastness.Though do not list the example about those various China inks here, they but comprise in the present invention.In the present invention, more preferably, aforesaid black A and black B are respectively magenta ink and cyan ink.Certainly the present invention is not limited to aforementioned.

To provide above-described summary info below.Complete China ink according to the first embodiment of the present invention has following composition.That is to say that described complete China ink with the multiple China ink that comprises dyestuff separately has following China ink at least: wherein said China ink is (hereinafter to be referred as " first China ink ") more than the 7mN/ in the dynamic surface tension and the difference of described China ink between the dynamic surface tension in 500 milliseconds of life-spans in 50 milliseconds of life-spans.In addition, to be defined as black A at first China ink and the China ink that is included between at least a China ink except that first aqueous ink in the described complete China ink, will be defined as black B at the China ink between the first black and described at least a China ink with relatively low brightness with relative higher brightness.In this case, black A is at the dynamic surface tension γ in 500 milliseconds of life-spans _a(mN/m) and black B at the dynamic surface tension γ in 500 milliseconds of life-spans _b(mN/m) must satisfy relation-5≤(γ _a-γ _b)≤3.

The present inventor has further studied first purpose of the present invention.Thereby, the contriver reaches a conclusion, brightness according to China ink, the bleeding problem that might technical solution occurs when using described first China ink is more than the 7mN/m in black dynamic surface tension and the difference of described China ink between the dynamic surface tension in 500 milliseconds of life-spans 50 milliseconds of life-spans described in described first China ink.

That is to say that China ink according to another embodiment of the invention has following composition.That is to say, described China ink is first China ink of complete China ink that comprises dyestuff and be used to have the multiple China ink of each self-contained dyestuff, and wherein said China ink is more than the 7mN/ in the dynamic surface tension and the difference of described China ink between the dynamic surface tension in 500 milliseconds of life-spans in 50 milliseconds of life-spans.In addition, to be defined as black A at first China ink and the China ink that is included between at least a China ink except that first aqueous ink in the described complete China ink, will be defined as black B at the China ink between the first black and described at least a China ink with relatively low brightness with relative higher brightness.In this case, black A must satisfy relation-5≤(γ a-γ b)≤3 at the dynamic surface tension γ in 500 milliseconds of life-spans a (mN/m) and black B at the dynamic surface tension γ in 500 milliseconds of life-spans b (mN/m).

Next, second purpose of various details promptly keeps color homogeneity when common paper or its analogue are suppressed above-mentioned bleeding and increase gradation during as recording medium.

Be used to realize that a technological thought of above-mentioned second purpose is as follows: in order to improve the gradation of image by the area of suitably controlling a single point, suppress to be right after the diffusion of the China ink after China ink is administered to recording medium, in addition, make black rapid permeability enter the diffusion that suppresses China ink in the recording medium simultaneously.In addition, be used to realize that another technological thought of above-mentioned second purpose is, give the wetting properties in the space that exists between the enough fibers of China ink, so that improve the color homogeneity in the image the formation recording medium.

The present inventor has carried out following research about China ink disperse state on recording medium.At first, the contriver has prepared the China ink that various characteristics differs from one another, and wherein their dynamic surface tension changed along with the life-span, and by using every kind of record single-point ruling on various recording mediums such as common paper of those China inks.Then, the contriver after deliberation the live width of described ruling and China ink every kind from 10 milliseconds of life-spans to 5, the relation between every person of the dynamic surface tension in 000 millisecond of life-span and static surface tension.Thereby the contriver has been found that the live width of described ruling and the dynamic surface tension of every kind of China ink 50 milliseconds of life-spans demonstrate strong dependency each other in each of all types of recording mediums of studying.In addition, the contriver has been found that be center when departing from forward or backward when the life-span with 50 milliseconds of life-spans, and described dependency continues to weaken.Consider foreground, the present inventor has obtained such knowledge, promptly to every kind of research at the dynamic surface tension in 50 milliseconds of life-spans of China ink, makes the disperse state of live width Jimo on every kind of recording medium of described ruling to be determined.In above-mentioned research, the live width of described ruling is being placed at recorded matter and is being measured after spending the night.

Consider foreground, the present inventor further studies, and every kind that is primarily focused on China ink simultaneously on the dynamic surface tension characteristic in 50 milliseconds of life-spans.Specifically, the contriver has prepared it and has had the China ink of the dynamic surface tension of various variations 50 milliseconds of life-spans, every kind by these China inks of use forms image, and after deliberation in the gradation of gained image and every kind of relation between the dynamic surface tension in 50 milliseconds of life-spans of China ink.Thereby the contriver has obtained such knowledge, promptly is set at 42mN/m when above when every kind of dynamic surface tension 50 milliseconds of life-spans with China ink, can suppress every kind of excess diffusion on recording medium of China ink.

The present inventor considers that China ink exists the reason of high correlation as described below in disperse state on the recording medium and China ink between the dynamic surface tension in 50 milliseconds of life-spans.That is to say, be administered to 50 milliseconds time point of recording medium from China ink, to the near surface zone of small part China ink infiltration recording medium, and described zone is to be used for determining that China ink forms an important factor of the area of a single point on recording medium.In addition, since China ink is administered to recording medium after the variation of the contact angle between China ink and recording medium of the variation of the dynamic surface tension value of China ink to be considered to also be the factor that is used to determine the area of formation a single point on recording medium.Further, compare in the infiltration of recording medium thickness direction with China ink, on being applied in recording medium after and then for example in China ink the evaporation of moisture occur more frequently relatively.Think that China ink also depends on black dynamic surface tension 50 milliseconds of life-spans in the infiltration capacity of recording medium thickness direction, and think that described dependency also is another important factor that is used to determine to form the area of a single point on recording medium.

Yet when China ink continued to keep high surface tension for a long time, China ink did not permeate at the recording medium thickness direction, and the result is that China ink spreads on the recording medium surface, and can reduce gradation under some situation.What the present inventor carried out studies show that, following steps can effectively suppress the reduction of gradation.At first, can suppress the excess diffusion of China ink on recording medium by improving the dynamic surface tension of China ink 50 milliseconds of life-spans.Then, the rapid reduction of dynamic surface tension of China ink so that promote the infiltration of China ink at the recording medium thickness direction, extra thus inhibition the diffusion of China ink on the recording medium surface.Like this, can obtain the proper area of the black a single point that on recording medium, forms.What the present inventor carried out studies show that, specifically, China ink dynamic surface tension in 50 milliseconds to 500 milliseconds life span just is enough to produce this phenomenon more than reducing 7mN/m.

Thereby, the present inventor has been found that, China ink with following characteristic provides the excellent images gradation: described China ink has the dynamic surface tension more than the 42mN/m in 50 milliseconds of life-spans, and dynamic surface tension and China ink the difference the dynamic surface tension in 500 millisecond life-spans between of China ink 50 milliseconds of life-spans is more than the 7mN/m.Further, the difference between the dynamic surface tension in 500 milliseconds life-span is 10mN/m when above at the dynamic surface tension in 50 milliseconds of life-spans and China ink when China ink, can improve gradation especially.

In addition, when with common paper or its analogue during as recording medium, in order to improve color homogeneity, the dyestuff in the China ink must be fixed on the recording medium equably.Should note, with the state of the even photographic fixing of China ink be not dyestuff in the finger writing or painting be absorbed in as in the common paper of recording medium or the big relatively space on its analogue so that localized state, and be meant that the fiber of forming recording medium is by the uniform painted state of the dyestuff in the China ink.In addition, for the even photographic fixing of the dyestuff in the China ink, need described China ink for example to bring into play wetting properties in the space between the fiber for the hole.The present inventor studies making China ink have the necessary physical properties of wetting properties for the hole.Thereby the contriver has been found that and must determine the dynamic surface tension of China ink 500 milliseconds of life-spans rightly.Specifically, the contriver has been found that the dynamic surface tension of China ink 500 milliseconds of life-spans is necessary for below the 38mN/m.That is to say that the present inventor has obtained such knowledge, promptly, require China ink to possess following dynamic surface tension characteristic in order to improve color homogeneity simultaneously and to improve gradation.That is to say that the China ink with following characteristic is preferred: the dynamic surface tension of China ink 50 milliseconds of life-spans is more than the 42mN/m, China ink is more than the 7mN/m in the dynamic surface tension and the difference of China ink between the dynamic surface tension in 500 milliseconds of life-spans in 50 milliseconds of life-spans, and the dynamic surface tension of China ink in 500 life-spans is below the 38mN/m.

China ink is under the dynamic surface tension in 50 milliseconds of life-spans is situation more than the 49mN/m, even to reduce degree bigger when the dynamic surface tension of China ink after the life-span, the diffusion of China ink on the recording medium surface has than China ink in the higher priority of the infiltration of recording medium thickness direction.Thereby the area of a single point increases, and sometimes can not obtain gradation.Therefore, China ink is preferably more than the 42mN/m extremely less than 49mN/m at the dynamic surface tension in 50 milliseconds of life-spans.

In addition, cross when low at the dynamic surface tension in 500 milliseconds of life-spans when China ink, when particularly being lower than 28mN/m, China ink infiltrates recording medium to have than having higher priority with black wetting space between fiber.Thereby, China ink infiltration recording medium (at the thickness direction of recording medium) easily, black coming out from the back side of recording medium therefore may occur is strike through (strike-through) phenomenon.Therefore, China ink is preferably more than the 28mN/m to 38mN/m at the dynamic surface tension in 500 milliseconds of life-spans.Further, in the present invention, China ink is preferably more than the 32mN/m to 38mN/m especially at the dynamic surface tension in 500 milliseconds of life-spans.

In addition, after the area that 50 milliseconds of life-span China inks infiltrate recording medium has been determined to a certain extent, from promoting China ink to infiltrate the angle of recording medium, China ink is preferably bigger in the dynamic surface tension and the difference of China ink between the dynamic surface tension in 500 milliseconds of life-spans in 50 milliseconds of life-spans.Yet as mentioned above, the dynamic surface tension of China ink 500 milliseconds of life-spans is necessary for more than the 28mN/m.Therefore, the difference between the dynamic surface tension in 500 milliseconds of life-spans is preferably and is equal to or less than (China ink is in the dynamic surface tension value (mN/m)-28 (mN/m) in 50 milliseconds of life-spans) China ink at the dynamic surface tension in 50 milliseconds of life-spans and China ink.Further, China ink more preferably is lower than 21mN/m in the dynamic surface tension and the difference of China ink between the dynamic surface tension in 500 milliseconds of life-spans in 50 milliseconds of life-spans.

Above show, when common paper or its analogue can be improved gradation and keep the China ink (hereinafter to be referred as " first China ink ") of color homogeneity must meet the following conditions (1) to (3) simultaneously during as recording medium: it is to less than 49mN/m more than the 42mN/m that (1) first China ink has dynamic surface tension 50 milliseconds of life-spans, (2) first China inks the dynamic surface tension in 500 milliseconds of life-spans be more than the 28mN/m to 38mN/m, and dynamic surface tension and first China ink the dynamic surface tension in 500 millisecond life-spans between the difference of (3) first China inks 50 milliseconds of life-spans is more than the 7mN/m.

To provide above-described summary info below.The complete China ink of second embodiment according to the present invention has following composition.That is to say to have the complete China ink of the multiple China ink that comprises dyestuff separately, it has satisfied first China ink of condition (1) to (3) as mentioned above at least.In addition, at first China ink be included between at least a China ink except that first aqueous ink in the complete China ink, the China ink that will have relative higher brightness is defined as black A, and the China ink that will have relatively low brightness is defined as black B.In this case, black A is at the dynamic surface tension γ in 500 milliseconds of life-spans _a(mN/m) and black B at the dynamic surface tension γ in 500 milliseconds of life-spans _b(mN/m) must satisfy relation-5≤(γ _a-γ _b)≤3.

In addition, the complete China ink of the 3rd embodiment has following composition according to the present invention.That is to say to have the described complete China ink of the China ink of at least three kinds of each self-contained dyestuffs, it has satisfied first China ink of condition (1) to (3) as mentioned above at least.In addition, in the arbitrarily select two types China ink, the China ink that will have relative higher brightness is defined as black A at least three kinds of China inks from be included in complete China ink, and the China ink that will have relatively low brightness is defined as black B.In addition, black A is expressed as γ at the dynamic surface tension in 500 milliseconds of life-spans _a(mN/m), black B is expressed as γ at the dynamic surface tension in 500 milliseconds of life-spans _b(mN/m).In this case, from least three kinds of China inks that are included in complete China ink, arbitrarily in each of all combinations of select two kinds of China inks, must there be relation-5≤(γ _a-γ _b)≤3.

In complete China ink, in each of all combinations of China ink arbitrarily select two types from least three types the China ink that is included in complete China ink, must there be relation-5≤(γ according to the 3rd embodiment _a-γ _b)≤3.In this case, the part of the combination of two kinds of China inks may not contain first China ink.In the combination that does not contain first China ink, as under the complete black situation of routine, the static surface tension homogenizing of the China ink by making combination suppresses the appearance of bleeding.Yet, in the present invention, even in the combination that does not contain first China ink, the China ink of combination also preferably satisfies above-mentioned relation at the dynamic surface tension in 500 milliseconds of life-spans, so that described China ink can be mutually the same aspect entering within the recording medium with improved accuracy perviousness.

Complete China ink of the present invention as mentioned above is characterized in that having the multiple China ink of each self-contained dyestuff, and has aforesaid first China ink at least.

The notion of described complete China ink comprises the complete China ink that is in this state in the present invention: promptly print cartridge comprises a kind of China ink in the multiple China ink separately separately and is in the complete China ink of following state: print cartridge is by integrated formation of a plurality of black reservoir of the multiple China ink of contain respectively.Described in addition print cartridge may be further and the integrated formation of record-header.Perhaps, the print cartridge of a kind of China ink in the independent separately multiple China ink of contain forms the state that can dismantle from ink jet recording device, be also contained in the notion of described complete China ink of the present invention.In any case as long as complete China ink of the present invention forms any China ink that other can be used in combination that has first China ink at least and comprise dyestuff, therefore described complete China ink is not limited to above-mentioned form and may is any form.

Should be noted that except the China ink of each self-contained dyestuff described complete China ink of the present invention can also comprise the China ink that contains pigment.Usually, when writing down on the recording medium with black receiving layer, do not use the described China ink that comprises pigment, therefore described China ink may not have aforesaid any dynamic surface tension characteristic.

(China ink)

In first embodiment of the present invention, must regulate first China ink so that possess aforesaid any dynamic surface tension characteristic.In addition, in each of the of the present invention second and the 3rd embodiment, must regulate first China ink to possess aforesaid dynamic surface tension characteristic (1) to (3).In addition, in the present invention, must regulate as mentioned above the black A that from the multiple China ink of forming complete China ink, determines and black B so that possess aforesaid dynamic surface tension characteristic.Except foreground, can adopt the composition in the China ink of routine.Every kind of component forming China ink of the present invention will be described below.

(tensio-active agent)

Every kind of tensio-active agent that preferably comprises as permeate agent forming the China ink of complete China ink of the present invention.In addition, require to regulate prepared China ink so that have aforesaid variation aspect dynamic surface tension.

(nonionogenic tenside)

Voranol EP 2001, polyoxyethylene fatty acid ester, polyoxyethylene alkyl phenyl ether, polyox-yethylene-polyoxypropylene block copolymer etc.The ethylene oxide adduct of fatty acid diethanolamine, acetylenediol, acetylenediol class tensio-active agent etc.

(anion surfactant)

Polyoxyethylene alkyl ether sulfate salt, Voranol EP 2001 sulfonate, polyoxyethylene alkylphenyl ether sulfate salt, polyoxyethylene alkyl phenyl ether sulfonate etc.α-sulfofatty acid esters salt, alkylbenzene sulfonate, alkyl phenol sulfonate, sulfonated alkyl naphathalene, alkyl tetrahydro naphthalenesulfonate, dialkyl group esters of sulfosuccinic acids etc.

(cats product)

Alkyl trimethyl ammonium salt, dialkyl dimethyl ammonium chloride etc.

(amphoterics)

Alkyl carboxyl betaine etc.

(other tensio-active agents)

Fluoride compound, silicone resin compounds etc.

In first embodiment of the present invention, must regulate first China ink so that have aforesaid dynamic surface tension characteristic.In addition, in each of the of the present invention second and the 3rd embodiment, must regulate first China ink to possess aforesaid dynamic surface tension characteristic (1) to (3).Have the dynamic surface tension of China ink of the tensio-active agent of above-listed one or two or more types by adjusting, described first China ink can obtain every kind of aforesaid dynamic surface tension characteristic.

In the present invention, especially preferably regulate the dynamic surface tension of first China ink with the ethylene oxide adduct of Voranol EP 2001 in the middle of the above-mentioned tensio-active agent or acetylenediol.

In addition, in the present invention, especially preferred Voranol EP 2001 is at least a for the tensio-active agent kind of the tensio-active agent that is selected from each free following general formula (1) expression and the expression of each free following general formula (2).When with common paper or its analogue during as recording medium, the China ink that comprises this tensio-active agent is particularly suitable for reaching the compatibility between gradation and color homogeneity, because its dynamic surface tension changes to a great extent along with the variation in life-span.

General formula (1)

(in general formula (1), m, n and a respectively represent the integer more than 1 independently, and m+n represents 14 to 20 integer.)

General formula (2)

(in general formula (2), x, y and b respectively represent the integer more than 1 independently, and x+y represents 15 to 21 integer.)

In addition, in the present invention, above-mentioned tensio-active agent is preferably more than 12.0 to below 16.5 especially according to the HLB value of Griffin method.Here the described term of Shi Yonging " Griffin method " is meant a kind of method of calculating the HLB value, and the formula weight of its surfactants based hydrophilic radical and the molecular weight of tensio-active agent use following equation (1).

HLB=20 * (formula weight of the hydrophilic radical of tensio-active agent)/(molecular weight of tensio-active agent) (1)

When the HLB value less than 12.0 the time, the wetting ability of tensio-active agent is so low for example to make sometimes can not keep the state of surfactant dissolves in China ink when comprising China ink.On the other hand, when the HLB value greater than 16.5 the time, so high the making of the wetting ability of tensio-active agent is difficult to reduce the dynamic surface tension of China ink 500 milliseconds of life-spans.

The content (quality %) of tensio-active agent in first China ink is preferably more than the 0.30 quality % to 2.0 quality %, and perhaps more preferably 0.30 quality % is above to 1.5 quality %, with respect to the total mass of described China ink.When described content during less than 0.30 quality %, the member China ink of no use of stream that forms ink jet recording device is wetting fully, and sometimes can reduce the discharge stability of China ink.In addition, when described content surpasses 2.0 quality %, under near the situation of evaporating the outlet orifice of moisture at record-header in the China ink for example, the viscosity that the content of tensio-active agent becomes so high feasible China ink increases partly, may reduce the discharge stability of China ink.In addition, when with common paper or its analogue during as recording medium in order to obtain the excellent images quality, the lower limit of the content of tensio-active agent (quality %) is preferably more than the 0.30 quality % in first China ink, or more preferably more than the 0.75 quality %, with respect to the total mass of China ink.When described content is lower than 0.30 quality %, can not fully obtain the black wetting properties of common paper, and sometimes can reduce color homogeneity.The content of tensio-active agent in China ink is set in the above-mentioned scope, make when common paper or its analogue are used as recording medium, China ink can reach in good discharge stability and the compatibility between the excellent images quality, especially, and good color homogeneity.

In addition, content (quality %) in any China ink except that first China ink of tensio-active agent in being included in complete China ink is preferably more than the 0.10 quality % to 2.0 quality %, or more preferably 0.30 quality % is above to 1.5 quality %, with respect to the total mass of China ink.The preferable range of described content is not limited to above-mentioned scope certainly, because described preferable range can change according to surfactant structure or HLB value.

In addition, in the present invention, must regulate definite as mentioned above black A and black B so that possess aforesaid dynamic surface tension characteristic 500 milliseconds of life-spans.By regulating the dynamic surface tension of every kind of China ink with having above-listed one or both or more kinds of tensio-active agent, black A and black B can obtain aforesaid dynamic surface tension characteristic.Under in afore-mentioned, angle from jetting stability, surfactant content (quality %) in every kind in black A and black B is preferably more than the 0.10 quality % to 2.0 quality % with respect to the total mass of China ink, or more preferably 0.30 quality % is above to 1.5 quality %.

(aqueous medium)

Be included in every kind of China ink in the complete China ink of the present invention and preferably comprise aqueous medium as the mixed solvent of water and water-soluble organic compounds.Preferably deionized water (ion exchanged water) is used as this water.The content (quality %) of water in China ink is preferably more than the 30.0 quality % to 90.0 quality %, with respect to the total mass of China ink, so that described China ink can possess suitable viscosity it can be sprayed with being stabilized, and the China ink that can be suppressed at nozzle tip blocks.

In addition, any water-soluble organic compounds all can be used as described water-soluble organic compounds, makes it possess aforesaid dynamic surface tension characteristic as long as regulate China ink of the present invention.The content (quality %) of water-miscible organic solvent in China ink is preferably more than the 1.0 quality % to 50.0 quality %, and more preferably 3.0 quality % are above to 40.0 quality %, with respect to the total mass of China ink.Specifically, for example followingly anyly can both be used as described water-soluble organic compounds.

Alcohol with 1 to 6 carbon atom, for example ethanol, Virahol, 2-propyl alcohol, propyl carbinol, isopropylcarbinol, amylalcohol and hexanol; Carboxylic acid amides, N for example, dinethylformamide and N,N-dimethylacetamide; Ketone or keto-alcohol, for example acetone, methylethylketone and 2-methyl-2-hydroxyl pentane-4-ketone; Cyclic ethers, for example tetrahydrofuran (THF) is with diox; Alkylene glycol, for example ethylene glycol, glycol ether, triglycol, Tetraglycol 99,1,2-or 1, ammediol, 1,2-or 1,4-butyleneglycol and polyoxyethylene glycol; Polyvalent alcohol, for example glycerine, 1,3 butylene glycol, 1,2-or 1,5-pentanediol, 1,2-or 1,6-hexylene glycol, 2-methyl isophthalic acid, ammediol and 1,2,6-hexanetriol; The alkyl oxide of polyvalent alcohol, for example glycol monomethyl methyl (perhaps ethyl) ether, diglycol monotertiary methyl (perhaps ethyl) ether and triglycol monomethyl (perhaps butyl) ether; Heterocycle, for example 2-Pyrrolidone, N-N-methyl-2-2-pyrrolidone N-, 1,3-dimethyl-2-imidazolone and N-methylmorpholine; And sulfocompound, for example methyl-sulphoxide and sulfo-glycol ether.

Among them, the preferred especially water-soluble organic compounds with hypertonicity that uses is so that can suitably regulate the surface tension of described aqueous medium.Specifically, preferably especially use following any alcohol, for example ethanol, 2-propyl alcohol, 1,2-pentanediol, 1,5-pentanediol, 1,2-hexylene glycol and 1,6-hexylene glycol.

In first embodiment of the present invention, must regulate first China ink so that possess dynamic surface tension characteristic as mentioned above.In addition.In each of the of the present invention second and the 3rd embodiment, must regulate first China ink to possess aforesaid dynamic surface tension characteristic (1) to (3).By regulate the dynamic surface tension of China ink with above-listed one or both or more kinds of water-soluble organic compounds, also can make first China ink possess the first dynamic surface tension characteristic as mentioned above.In addition, when with common paper or its analogue during as recording medium, in order to obtain good especially gradation, the static surface tension of the aqueous medium in first China ink is preferably more than the 45mN/m to 57mN/m.The term that uses among the present invention " aqueous medium in the China ink " is meant the aqueous medium except that coloured material and tensio-active agent in China ink, i.e. water and water-soluble organic compounds.When the static surface tension of described aqueous medium is higher than 57mN/m or is lower than 45mN/m, in the time of in the middle of various common paper, will having the uneven common paper of big relatively surface energy as recording medium, sometimes can not obtain gradation fully.When the static surface tension of described aqueous medium is higher than 57mN/m, be applied near having the high surface energy part and have between the low surface energy part part of recording medium at China ink, China ink is easy to optionally flow into the part with high surface energy.As a result, tend to occur pinniform (feathering) part, and the change of the area change between the point is big, therefore sometimes can not fully obtain gradation.On the other hand, when the static surface tension of described aqueous medium was lower than 45mN/m, the surface tension of aqueous medium described in the China ink was lower than China ink and is applied near the part on the recording medium surface tension, therefore black rapid diffusion, thus sometimes can reduce gradation.

In addition, in the present invention, must regulate as mentioned above the black A that from the multiple China ink that is contained in complete China ink, determines and black B so that possess aforesaid dynamic surface tension characteristic 500 milliseconds of life-spans.By regulate the dynamic surface tension of every kind of China ink with above-listed one or both or more kinds of water-soluble organic compounds, black A and black B also can obtain aforesaid dynamic surface tension characteristic.

(coloured material)

The coloured material that is used for being included in every kind of China ink of complete China ink of the present invention is a dyestuff.It is above to 15.0 quality % that the content of dyestuff described in the China ink (quality %) is preferably 0.1 quality %, or more preferably 1.0 quality % are above to 10.0 quality %, with respect to the total mass of China ink.

Described dyestuff has no particular limits, as long as described dyestuff can be used as the coloured material of general ink-jet China ink, and can use in for example substantive dyestuff, matching stain, chemically-reactive dyes and the basic dyestuff any.By using color index number (color index numbers),, the example of available dyestuff is in the present invention shown below for each color shades.In addition, even the dyestuff of all not describing in any color index also can use, as long as they are water miscible.

(yellow coloring material)

C.I. directly yellow: 8,11,12,27,28,33,39,44,50,58,85,86,87,88,89,98,100,110,132,173 etc.C.I. turmeric yellow: 1,3,7,11,17,23,25,29,36,38,40,42,44,76,98,99 etc.

(magenta coloured material)

C.I. directly red: 2,4,9,11,20,23,24,31,39,46,62,75,79,80,83,89,95,197,201,218,220,224,225,226,227,228,229,230 etc.C.I. Xylene Red: 6,8,9,13,14,18,26,27,32,35,42,51,52,80,83,87,89,92,106,114,115,133,134,145,158,198,249,265,289 etc.C.I. edible red: 87,92,94 etc.C.I. directly purple: 107 etc.

(cyan coloured material)

C.I. sun blue: 1,15,22,25,41,76,77,80,86,90,98,106,108,120,158,163,168,199,226,307 etc.C.I. acid blue: 1,7,9,15,22,23,25,29,40,43,59,62,74,78,80,90,100,102,104,112,117,127,138,158,161,203,204,221,244 etc.

(orange coloured material)

C.I. von Muller's indicator: 7,8,10,12,24,33,56,67,74,88,94,116,142 etc.C.I. Xylene Red: 111,114,266,374 etc.C.I. direct orange: 26,29,34,39,57,102,118 etc.C.I. edible orange: 3 etc.C.I. reactive orange: 1,4,5,7,12,13,14,15,16,20,29,30,84,107 etc.C.I. DISPERSE ORANGE 30 200: 1,3,11,13,20,25,29,30,31,32,47,55,56 etc.

(green coloring material)

C.I. acid green: 1,3,5,6,9,12,15,16,19,21,25,28,81,84 etc.C.I. sun green: 26,59,67 etc.C.I. edible green: 3 etc.C.I. reactive green: 5,6,12,19,21 etc.C.I. Disperse Green: 6,9 etc.

(blue-colored material)

C.I. acid blue: 62,80,83,90,104,112,113,142,203,204,221,244 etc.C.I. reactive blue: 49 etc.C.I. acid violet: 17,19,48,49,54,129 etc.C.I. directly purple: 9,35,47,51,66,93,95,99 etc.C.I. reactive purple: 1,2,4,5,6,8,9,22,34,36 etc.C.I. 63 DISPERSE Violet 63: 1,4,8,23,26,28,31,33,35,38,48,56 etc.

(black colorant material)

C.I. directly black: 17,19,22,31,32,51,62,71,74,112,113,154,168,195 etc.C.I. erie black: 2,48,51,52,110,115,156 etc.C.I. edible black: 1,2 etc.

(brown colouration material)

C.I. reactive palm fibre: 1,2,7,8,9,11,17,18,21,31,32,33,46,47 etc.

(other components)

Except that aforesaid component, the every kind of China ink that is contained in the complete China ink of the present invention can also comprise being solid-state organic compound at normal temperatures as required, for example trimethylolethane or TriMethylolPropane(TMP), or nitrogenous compound for example urea or ethylidene-urea.In addition, except that said components, China ink of the present invention can comprise any of various additives such as pH regulator agent, rust-preventive agent, antiseptic-germicide, mould inhibitor, antioxidant, anti-reductive agent, evaporation accelerators and sequestrant, so that described China ink has required physical property values.

(ink jet recording method)

China ink of the present invention is used for a kind of like this ink jet recording method with being particularly suitable for, wherein by spraying China ink at the enterprising line item of recording medium by means of ink-jet recording system.The example of described ink jet recording method comprises, relates to China ink is applied mechanical energy carrying out the method for ink-jet and relating to China ink is applied the method that heat energy carries out ink-jet.Especially, when China ink of the present invention being used to relate to when using the ink jet recording method of heat energy, can present outstanding valuable effect.

(print cartridge)

Print cartridge of the present invention is characterised in that and comprises the black reservoir that is used to store China ink of the present invention.

(record cell)

Record cell of the present invention is characterised in that and comprises: the black reservoir that is used to store described China ink of the present invention; And the record-header that is used to spray described China ink.When record cell is when China ink being applied heat energy and make record-header spray the record cell of described China ink, can obtain unusual effect especially.

(ink jet recording device)

Ink jet recording device of the present invention is characterised in that and comprises: the black reservoir that is used to store described China ink of the present invention; And the record-header that is used to spray described China ink.When described ink jet recording device is when China ink being applied heat energy and make record-header spray the recording unit of described China ink, can obtain unusual effect especially.

Hereinafter, the composition of the mechanical part of ink jet recording device will be summarized.Ink jet recording device is made of following parts: paper feed portion, transport unit, seat part, row's paper portion (sheet delivery portion), cleaning section and be used to protect them and be provided for obtaining the outer packaging portion of equipment of the effect of each mechanism.Hereinafter, with the overview of each of describing them.

Fig. 2 is the skeleton view of ink jet recording device.Fig. 3 and 4 is the views that are used to illustrate the internal mechanism of ink jet recording device.Fig. 3 is the skeleton view of observing from the upper right side part, and Fig. 4 is the sectional view of described ink jet recording device.

When sending thin slice to recording unit, have only the recording medium of pre-determined quantity to be sent to the crack portion (referring to Fig. 2 and 4) that forms by intake roller M2080 and separate roller M2041 in the paper feed portion that comprises paper feed pallet M2060.The recording medium that transmits is separated in roll gap portion, only transmits uppermost recording medium.The recording medium that sends the paper transport unit to leads to be sent in the roller group of being made up of transfer roller M3060 and pinch roll M3070 by pinch roll stand M3000 and dancing roll baffle plate M3030.Rotate by LF motor E0002 by the described roller group that transfer roller M3060 and pinch roll M3070 form, and described rotation makes described recording medium be sent to platen M3040 upward (referring to Fig. 3 and 4).

When forming image, seat part is placed on the position that target image forms with record-header H1001 (see figure 5), sprays China ink according to the signal from circuit substrate (electricsubstrate) E0014 (see figure 3) on recording medium then.The detailed construction of described record-header H1001 will described subsequently.When with record-header H1001 executive logging, on recording medium, form image by the mode that alternately repeats elementary scanning and rescan, bearing M4000 (see figure 3) scans described recording medium at column direction in described elementary scanning, and conveying roller M3060 in described rescan (seeing Fig. 3 and 4) carries described recording medium at line direction.

At last, described recording medium is transferred to be expelled to transfer dish M3160 (see figure 2) then by the crack portion of fastening between the first conveying roller M3110 and relief outlet (spur) the (see figure 4) M3120 in delivery portion.

Cleaning section cleans described record-header H1001.By activating pump M5000 (see figure 3), described cleaning section absorbs from record-header H1001 China ink etc. under the state of the squit hole of lid M5010 (see figure 3) tight contact history head H1001.In addition, when cleaning section absorption of residual under the state opened of lid M5010 exists when cover black among the M5010, prevent black photographic fixing or any other disadvantageous effect.

(structure of record-header)

To the structure (see figure 5) of head cartridge H1000 be described.Described head cartridge H1000 comprises record-header H1001, be used to the equipment the device of print cartridge H1900 being installed and being used for the China ink from print cartridge H1900 is fed to record-header.Described head cartridge H1000 is removably mounted on bearing M4000 and goes up (see figure 3).

Fig. 5 shows print cartridge H1900 and how to be installed on the head cartridge H1000.Ink jet recording device forms image by in for example yellow, magenta, cyan, black, shallow magenta, light cyan and the green ink each, therefore be every kind of independent preparation print cartridge H1900 of these seven kinds of colors.In addition, as shown in Figure 5, each print cartridge H1900 is dismountable from head cartridge H1000.Print cartridge H1900 can be disassembled when head cartridge H1000 is installed in the state of bearing M4000 (see figure 3).

Fig. 6 shows the decomposition diagram of head cartridge H1000.Head cartridge H1000 forms member H1600, strainer H1700 by recording element substrate, pole plate, electric wiring substrate H1300, box frame (cartridgeholder) H1500, stream and caulking gum H1800 constitutes.Described recording element substrate is made up of the first recording element substrate H1100 and the second recording element substrate H1101, and described pole plate is made up of the first pole plate H1200 and the second pole plate H1400.

Each of the described first recording element substrate H1100 and the second recording element substrate H1101 all is to have the multiple silicon substrate that is used to spray black recording element (nozzle), and described silicon substrate is formed on its side by photolithography (photolithography).The electric distribution that supplies power to each recording element by being used to of forming such as aluminium forms technology etc. by film and forms, and also forms by photolithography corresponding to the multiple black stream of described recording element respectively.In addition, the black supply opening that is used for China ink is fed to a plurality of black streams forms upper shed overleaf.

Fig. 7 is each the amplification frontview of structure that is used to illustrate the first recording element substrate H1100 and the second recording element substrate H1101.Reference numeral H2000 represents recording element row (recording element trains) (being also referred to as nozzle rows hereinafter) to H2600, wherein the different black dyestuff of each supply.The first recording element substrate H1100 has the nozzle rows that is used for three kinds of colors: the nozzle rows H2000 that is used for yellow ink; The nozzle rows H2100 that is used for magenta ink; With the nozzle rows H2200 that is used for cyan ink.The second recording element substrate H1101 has the nozzle rows that is used for four kinds of colors: the nozzle rows H2300 that is used for the light cyan China ink; The nozzle rows H2400 that is used for black ink; The nozzle rows H2500 that is used for green ink; With the nozzle rows H2600 that is used for shallow magenta ink.

Each nozzle rows is included on the direction that recording medium is transmitted every 1,200dpi (point/inch; Reference value) 768 nozzles of Bu Zhiing, and the China ink of the about 2pl of each nozzle ejection.The port area of each squit hole is set to about 100 μ m ²

Hereinafter, will be described with reference to figure 5 and 6.The first recording element substrate H1100 and the second recording element substrate H1101 be in conjunction with also being fixed on the first pole plate H1200, and be used to supply China ink and be formed on the first pole plate H1200 to the black supply opening H1201 of the first recording element substrate H1100 and the second recording element substrate H1101.The second pole plate H1400 that has an opening also in conjunction with and be fixed on the first pole plate H1200.The second pole plate H1400 fixes electric wiring substrate H1300 in such a way: make to electrically connect between electric wiring substrate H1300, the first recording element substrate H1100 and the second recording element substrate H1101.

Electricity wiring substrate H1300 applies the electrical signal of each the injection China ink that is used to cause the nozzle that is formed on the first recording element substrate H1100 and the second recording element substrate H1101.Electricity wiring substrate H1300 has: corresponding to each the electric distribution of the first recording element substrate H1100 and the second recording element substrate H1101; And the end that is arranged on described electric distribution is to receive the external signal input end station H1301 from the electrical signal of ink jet recording device.Described external signal input end station H1301 is set up and is fixed on the rear side of box frame H1500.

Stream forms member H1600 and is fixed to the box frame H1500 that is used to support print cartridge H1900 by for example ultrasonic welding.Like this, formed from the black stream H1501 of print cartridge H1900 to the first pole plate H1200.Strainer H1700 is arranged on the terminal portions of the print cartridge side of the black stream H1501 that engages with print cartridge H1900, so strainer H1700 can prevent that dust from entering from the outside.Caulking gum H1800 is installed in the part that black stream H1501 and print cartridge H1900 engage, to prevent that China ink is from described part evaporation.

In addition, head cartridge H1000 forms by box frame portion and record-header H1001 are depended on each other.Described box frame portion forms member H1600, strainer H1700 by box frame H1500, stream and caulking gum H1800 forms.In addition, record-header H1001 is made up of the first recording element substrate H1100 and the second recording element substrate H1101, the first pole plate H1200, electric wiring substrate H1300 and the second pole plate H1400.

Here be described by for example adopting according to the record-header of hot ink-jet system example as the embodiment of record-header, described hot ink-jet system carries out record by electrothermal transducer (recording element), and wherein said electrothermal transducer is used for generating heat energy according to electrical signal and produces film boiling to impel China ink.For typical structure and principle, preferably use the ultimate principle that in for example US patent 4,723,129 and US patent 4,740,796, describes in detail.Described system is applicable to any in so-called type as required and the so-called successive type.

Described hot ink-jet system is applicable to type as required especially.Under the situation of type as required, at least one is applied in the electrothermal transducer that is provided with corresponding to the liquid flow path of preserving China ink corresponding to recorded information and the actuate signal that triggers the rapid temperature rise that surpasses nucleate boiling, thereby causes described electrothermal transducer to produce heat energy.Then, cause China ink to produce film boiling.Thereby the bubble in China ink can form one to one corresponding to described actuate signal.The breathing of described bubble causes by jet orifice sprays China ink, thereby forms at least one ink droplet.Described actuate signal is pulse form more preferably, because the breathing of described bubble can be carried out immediately and rightly, China ink can be discharged from good responsiveness thus.

China ink of the present invention can preferably not only be used for the record-header according to hot ink-jet system, and can be used for the ink jet recording device of use mechanical energy as described below.The ink jet recording device of this form comprises: the nozzle that has a plurality of nozzles forms substrate; The components of stres of placing and forming by piezoelectric and electro-conductive material with respect to described nozzle; And the China ink of filling the periphery of described components of stres.In addition, described components of stres moves by impressed voltage so that from the nozzle ejection China ink.

It is equipment separately that described ink jet recording device is not limited to aforesaid wherein record-header and print cartridge, and can be record-header become non-removable equipment with print cartridge is integrated.In addition, described print cartridge can be can divide ground or become one indissociably with being installed in record-header on the bearing, the photographic fixing portion that perhaps can be installed in ink jet recording device with the black delivery member supply China ink by for example pipe and so on to record-header.When described print cartridge has when being used to apply preferred negative pressure to the structure of record-header, its possible configuration is as follows.That is to say that cartridge can be positioned in the black reservoir of print cartridge, perhaps print cartridge can possess flexible black storage bag and spring portion, described spring portion is used for applying bias voltage on the direction of the internal volume that enlarges described bag.In addition, described ink jet recording device can adopt the continuous recording system, or with the form of line-at-a-time printer, and recording element is arranged in the scope corresponding to the whole width of recording medium in described line-at-a-time printer.

Embodiment

Hereinafter, by example and comparative example the present invention is described in more detail.Yet only otherwise deviate from purport of the present invention, the present invention is not limited to following examples.Except as otherwise noted, described term " part " and " % " is in mass.

(the HLB value and the structure of tensio-active agent)

Measure the HLB value of tensio-active agent.Specifically, the HLB value of the main ingredient of each tensio-active agent is calculated by using Griffin method (following equation (1)).Table 1 shows described result.

HLB=20 * (formula weight of the hydrophilic radical of tensio-active agent)/(molecular weight of tensio-active agent) (1)

In addition, table 1 centralized displaying each tensio-active agent main ingredient structure and when described surfactant structure during, the value of the value of m, n, a and m+n or x, y, b and x+y corresponding to general formula (1) or general formula (2).In table 1, EMALEX1615 is by NIHON EMULSION Co., the tensio-active agent that Ltd makes, and Acetylenol E100 is by KawakenFine Chemicals Co., the tensio-active agent that Ltd makes.In addition, EMULMINCO-50 and EMULMINNL90 are the tensio-active agents of being made by Sanyo Chemical Industries Ltd., and NIKKOL BT-7 is by Nikko Chemicals Co., the tensio-active agent that Ltd makes.

Table 1

(preparation China ink)

Mix to be shown in table 2 each each component to 4, fully stir described mixture then.Then, described resultant filters by the micro-strainer (being made by Pall Corporation) with 0.2 micron pore size under pressure, prepares every kind in cyan ink (C1 is to C5), magenta ink (M1 is to M8) and the yellow ink (Y1 is to Y3) thus.Table 2 to 4 in, EMALEX1615 is by NIHON EMULSION Co., the tensio-active agent that Ltd makes, AcetylenolE100 is by Kawaken Fine Chemicals Co., the tensio-active agent that Ltd makes.In addition, EMULMIN CO-50 and EMULMIN NL90 are the tensio-active agents of being made by Sanyo Chemical Industries Ltd., and NIKKOL BT-7 is by Nikko Chemicals Co., the tensio-active agent that Ltd makes.

Table 2 (unit: %)

Table 3 (unit: %)

Table 4 (unit: %)

(evaluation)

(measurement dynamic surface tension)

Measure the above every kind of China ink that obtains at the dynamic surface tension (1) in 50 milliseconds of life-spans and every kind of China ink dynamic surface tension (2) 500 milliseconds of life-spans.In addition, determine difference DELTA γ [(1)-(2)] between described dynamic surface tension (1) and (2).In described measurement, used equipment (the pressure in bubbles tonometer BP2 that measures dynamic surface tension by maximum bubble pressure method; Make by KRUSS).In addition, described dynamic surface tension is all measured in the time of 25 ℃.Table 5 has shown the evaluation result that is used for dynamic surface tension.

(measurement of brightness)

With the every kind filling of print cartridge with the China ink of above acquisition, be installed in then on the conversion unit of ink jet recording device iP3100 (making) by Canon Inc., wherein spray China ink from record-header by the heat energy effect.Then, at recording medium (PR-101; Make by Canon Inc.) enterprising line item, so that be 1.0ng at the black amount of application of the every pixel of 600ppi resolving power.The brightness of gained image is measured as 2 ° at the visual angle light source by using D65 with Spectrolino (manufactured by GretagMacbeth).Table 5 illustrates the measuring result of brightness.

Table 5

By table 5 obviously as can be seen, the China ink that is equivalent to first China ink of the present invention is C1 every kind to C5, M2 and Y1.By using each to form image having on the inhomogeneity common paper of excellent color with 100% logger task corresponding to the China ink of first China ink among the present invention.This recording unit that uses in forming with epigraph and recording medium are ink jet recording device iP3100 and PPC paper Office Planner (making by CanonInc.).

(having the bleeding in the complete China ink of two types of China inks)

By using black C1 from above acquisition to C5, M1 to M8 with the combination of Y1 select two kinds of China inks to the Y3, obtain the complete China ink shown in following table 6.Then, as shown in table 6, between two types the China ink in being included in complete China ink, the China ink with relative higher brightness is defined as black A, and the China ink with relatively low brightness is defined as black B.Table 6 has shown every kind the brightness value of black A and black B, and black A is at the dynamic surface tension γ in 500 milliseconds of life-spans _a, black B is at the dynamic surface tension γ in 500 milliseconds of life-spans _b, and the difference (γ between described dynamic surface tension _a-γ _b).

With the every kind filling of print cartridge with the black A and the black B that are included in the multiple China ink in the complete China ink, be installed in then on the conversion unit of ink jet recording device iP3100 (making) by Canon Inc., wherein spray China ink from record-header by the heat energy effect.Then, in the mode of four-way (path) at recording medium (PR-101; Make by Canon Inc.) go up and form the image shown in Fig. 1.The bleeding situation is with the naked eye observed and assessed to the described recorded matter that obtains.The standard to describe that is used to estimate the bleeding situation is as follows.Table 6 has shown the result of described evaluation.

A: on entire image, do not observe bleeding.

B: observe the bleeding on image slightly, but described image is in acceptable level.

C: on entire image, observe bleeding.

Table 6

Table 6 ' continues '

Can obviously find out from table 6, in each of the example 1 to 3,5,6,8 to 11,13 to 15,17,18 and 20 to 22, γ _a-γ _bValue be more than-3 to below 3, image is in good level because do not observe bleeding on entire image.In addition, in each of the example 4,7,12,16 and 19, γ _a-γ _bValue be more than-5 to below-3, image is in acceptable level because observe bleeding on a part of image, described bleeding degree is slight.On the other hand, in each of comparative example 1 to 4, γ _a-γ _bValue is above 3 or less than-5, so be in unacceptable level because observe the bleeding image on entire image.

When black M8, C1 in the middle of being primarily focused on all China inks and Y1 go up.China ink M8 is at 500 milliseconds of dynamic surface tensions with 41mN/M, and every kind of black C1 of while and Y1 at 500 milliseconds of dynamic surface tensions that all have 37mN/M.In the combination of black M8 and C1 (comparative example 2), image is in not preferred level because observe bleeding on entire image.On the contrary, in the combination (embodiment 16) of black M8 and Y1, image is in acceptable level, though can observe slight bleeding on the part of image.As for the combination of black M8 and C1 and the combination of black M8 and Y1, the absolute value of the difference of described China ink between 500 milliseconds dynamic surface tension all is 4, but because the cause of the brightness relationship between the described China ink, the degree that bleeding occurs differs from one another.

At γ _a-γ _bValue and the bleeding of the combination of two types of China inks between relation do not depend on the type or the content of the permeate agent (tensio-active agent and/or water-soluble organic compounds) that is used for every kind of China ink.

(bleeding in comprising the complete China ink of three types of China inks)

By using the combination of select three types China ink from black C1, C2, M1, M2, M4 and the Y1 to Y3 of above acquisition, obtain the complete China ink shown in following table 7.Then, as shown in table 7, for all (three kinds) combinations of three kinds of select two kinds of China inks of China ink from be included in complete China ink, the China ink with relative higher brightness is defined as black A, and the China ink with relatively low brightness is defined as black B.Below be presented in the table 7: the brightness value of each of black A and black B, black A is at the dynamic surface tension γ in 500 milliseconds of life-spans _a, black B is at the dynamic surface tension γ in 500 milliseconds of life-spans _b, and the difference (γ between described dynamic surface tension _a-γ _b).

With the every kind filling of print cartridge with the black A and the black B that are included in the multiple China ink in the complete China ink, be installed in then on the conversion unit of ink jet recording device iP3100 (making) by Canon Inc., wherein spray China ink from record-header by the heat energy effect.Then, in the mode of four-way at recording medium (PR-101; Make by Canon Inc.) go up and form the image shown in Fig. 1.With the naked eye observe all (three kinds) by select two kinds of China inks in three kinds of China inks of use from be included in complete China ink to make up the recorded matter that obtains, and assessment bleeding situation.The standard to describe that is used to estimate the bleeding situation is as follows.Table 7 has shown the result of described evaluation.

A: on entire image, do not observe bleeding.

B: observe the bleeding on image section slightly, but described image is in acceptable level.

C: on entire image, observe bleeding.

In addition, with the naked eye observe all (three) by select two kinds of China inks in three kinds of China inks of use from be included in complete China ink to make up the recorded matter that obtains, and the bleeding situation in each complete China ink is carried out comprehensive evaluation.The standard to describe that is used for comprehensive evaluation bleeding situation is as follows.Table 7 has shown the result of described evaluation.

A: in the China ink of arbitrary combination, on entire image, do not observe bleeding.

B: in some China ink combination, on parts of images, slightly observe bleeding, but described image is in acceptable level.

C: in some China ink combination, on entire image, observe bleeding.

Table 7

Table 7 ' continues '

From table 7, can obviously find out, under the situation of above-mentioned complete China ink with two types of China inks, only identical evaluation be done in all combinations of picking out two types of China inks from three types the China ink that is included in complete China ink.As for embodiment 23 and 24, wherein γ _a-γ _bValue be more than-3 to below 3, any two types of China inks in the middle of three types of China inks in being included in complete China ink all the combination in because do not observe bleeding on entire image, image is in good level.In addition, among the embodiment 25 of the combination of two types of China inks in the middle of having comprised three types of China inks that are being contained in the complete China ink, γ wherein _a-γ _bValue is-4, presents following bleeding behavior.That is to say, at its γ _a-γ _bIn the combination of value for two types of China inks of-4, although image is in acceptable level and can observes bleeding slightly at image section; And, in other the combination of two types of China inks, on entire image, all do not observe bleeding.Therefore, in embodiment 25, bleeding integrates the acceptable level that is in.On the other hand, in the reference example 1 of the combination of two types of China inks in the middle of having comprised three types of China inks that are being contained in the complete China ink, γ _a-γ _bValue is 6, observe bleeding in this combination, and described bleeding comprehensively is in unacceptable level on entire image.

Though the reference example embodiment has been described the present invention, present invention is to be construed as and be not limited to described disclosed exemplary.The scope of following claim will be endowed the wideest explanation, thus cover all improvement and etc. equal 26S Proteasome Structure and Function.

Claims (5)

1. complete China ink, it comprises the multiple aqueous ink of each self-contained dyestuff, wherein:

Described complete China ink has first aqueous ink that comprises dyestuff at least;

Described first aqueous ink comprises Voranol EP 2001;

Described first aqueous ink is more than the 7mN/m in the dynamic surface tension and the difference of described first aqueous ink between the dynamic surface tension in 500 milliseconds of life-spans in 50 milliseconds of life-spans; And

In first aqueous ink be included between at least a aqueous ink except that first aqueous ink in the described complete China ink, have the dynamic surface tension γ of the black A of relative higher brightness 500 milliseconds of life-spans _a(mN/m) and have the dynamic surface tension γ of the black B of relatively low brightness 500 milliseconds of life-spans _b(mN/m) satisfy relation-5≤(γ _a-γ _b)≤3.

2. complete China ink, it comprises the multiple aqueous ink of each self-contained dyestuff, wherein:

Described complete China ink has first aqueous ink that comprises dyestuff at least;

Described first aqueous ink comprises Voranol EP 2001;

Described first aqueous ink meet the following conditions (1) to (3):

(1) the dynamic surface tension in 50 milliseconds of life-spans be more than the 42mN/m to less than 49mN/m,

(2) the dynamic surface tension in 500 milliseconds of life-spans be more than the 28mN/m to 38mN/m, and

(3) dynamic surface tension and the difference between the dynamic surface tension in 500 milliseconds of life-spans 50 milliseconds of life-spans is more than the 7mN/m; And

In first aqueous ink be included between at least a aqueous ink except that first aqueous ink in the described complete China ink, have the dynamic surface tension γ of the black A of relative higher brightness 500 milliseconds of life-spans _a(mN/m) and have the dynamic surface tension γ of the black B of relatively low brightness 500 milliseconds of life-spans _b(mN/m) satisfy relation-5≤(γ _a-γ _b)≤3.

3. complete China ink, it comprises the aqueous ink of each self-contained dyestuff of at least three types, wherein:

Described complete China ink has first aqueous ink that comprises dyestuff at least;

Described first aqueous ink comprises Voranol EP 2001;

Described first aqueous ink meet the following conditions (1) to (3):

(1) the dynamic surface tension in 50 milliseconds of life-spans be more than the 42mN/m to less than 49mN/m,

(2) the dynamic surface tension in 500 milliseconds of life-spans be more than the 28mN/m to 38mN/m, and

(3) dynamic surface tension and the difference between the dynamic surface tension in 500 milliseconds of life-spans 50 milliseconds of life-spans is more than the 7mN/m; And

In at least three types aqueous ink from be contained in described complete China ink, in any select any two types aqueous ink, have the dynamic surface tension γ of the black A of relative higher brightness 500 milliseconds of life-spans _a(mN/m) and have the dynamic surface tension γ of the black B of relatively low brightness 500 milliseconds of life-spans _b(mN/m) satisfy relation-5≤(γ _a-γ _b)≤3.

4. ink jet recording method, it comprises by ink ejecting method and sprays multiple China ink that wherein said multiple China ink comprises the whole described aqueous ink that constitutes complete China ink according to claim 1.

5. ink jet recording method according to claim 4, wherein said ink ejecting method are the ink jet recording methods that described multiple China ink sprays from record-header by the effect of heat energy.

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