JPS5953565A - Jet ink composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The invention relates to a 1/-1 water jet ink composition.

History 7. Actually, the nozzle part of the Noet printer [I Mi! The present invention relates to an improved aqueous jet ink composition that can be used for a long time without causing irritation and can provide recorded matter with good light resistance.

By the way, the basic printing principle of the known inkjet recording method is, from the viewpoint of the method of ejecting ink droplets from the nozzle, the electrostatic attraction type, the intermittent ejection type with a pressure of several atm. There are methods such as a continuous discharge type that applies continuous pressure. From the perspective of how to sterilize the ink droplets, there are charge deflection type, electric field deflection type, non-marketable type (on-demand type), etc. In practice, it seems that recording methods with their own characteristics have been proposed and implemented by combinations of the above-mentioned ejection method and ink droplet side method. However, the characteristics of the ink (viscosity, surface tension, etc.), electrical characteristics, etc. that are suitable for each method and the shape of the nozzle used for it are different. Therefore, in any inkjet method, ink must be continuously and stably ejected as uniform ink particles from fine nozzles.

Therefore, the basic problem to be solved by the ink printer is to completely prevent clogging of the nozzle portion and ensure continuous and stable generation of ink particles over a long period of time. Another important point is that stable ink particles can be created again after a brief pause. Naturally, fine nozzles can become clogged even if a small amount of solvent-insoluble solids are deposited on them. Even if a solid object adheres to a part of the nozzle, the direction of ink ejection will change.

Therefore, in order to eject continuous and stable ink particles, the viscosity and surface tension of the ink composition must be appropriate;
It is necessary to completely remove the solvent-insoluble solid content. It is also necessary to completely prevent the generation of solvent-insoluble solids over time.

When coloring a water-based jet ink composition, it is possible to remove or prevent the occurrence of solvent-insoluble solids by using a water-soluble dye.

However, in a system using water-soluble phase dye R1, it is easy to satisfy the basic requirement of the inkwetting method, which is to prevent the generation of solvent-insoluble solids, but on the other hand, the light resistance of the recorded material is poor. The disadvantage of sufficiency arises.

To put this more concretely, after a certain period of time, the recorded characters disappear or become difficult to read! When Samurai painted a color painting, discoloration of the painting often occurred due to the difference in light fastness of the mixed dyes.

That is, 4, j1 used in conventional aqueous jet ink compositions.
Water-soluble dyes that are used in water-soluble dyes may have insufficient light per surface, nozzle clogging, and other conditions necessary for continuous jet ink, and requirements when printing on recorded materials. In terms of the types of colors, hues, etc. that can be used, there are naturally limitations on the types that can be used.

Therefore, one of the inventors of the present invention has already proposed an ink composition containing a water-soluble ultraviolet absorber in order to improve the various deficiencies and limiting conditions mentioned above. However, the requirements for light resistance in this type of market are becoming increasingly strict.

In addition, it is generally known that the light fastness of a dyed product (ink jet recorded product in the present invention) is closely influenced (interacted) by various conditions such as the substrate, coexisting substances, and environmental conditions. ing. Since there are not enough research results regarding these problems related to photobleaching, it is extremely difficult to assemble a unified theoretical system. For example, when talking about substrates, well-known unique problems in interaction with substrates include the high light fastness of cationic dyed acrylic fibers and the low light fastness of yellow vat dyes dyed with woiron dyes. It is known for its light resistance. However, there is no knowledge of this kind regarding inkjet recorded matter.

Therefore, the present inventors discovered that the durability of inksheet recorded material was 91-1.
In order to improve
/1. As a result of investigating various compounds that improve light resistance, they found that water-soluble tannin or a combination of water-soluble protein and water-soluble quenching substance can improve light resistance by 1J.

At the same time, the present inventor@ has demonstrated the recording properties of inkjet recording I11. The ink composition of the present invention, that is, a novel ink composition comprising a combination of an aqueous jet ink composition, a water-soluble monolithic substance, or a water-soluble protein and a water-soluble quenching substance, which does not impair the It has been reached.

Therefore, the object of the present invention is 1'r1. In addition to further improving the light resistance of recorded materials, the technology eliminates the problem of nozzle clogging, which previously was unavoidable in inkjet systems, and expands the types of water-soluble dyes that can be used in water-based jet ink compositions. A novel aqueous jet ink composition, that is, the present invention is directed to (1) an aqueous jet ink composition containing a water-soluble dye, a wetting agent, and water as main components, further comprising a water-soluble tongue material; (2) an aqueous jet ink composition containing at least one of a water-soluble dye, a wetting agent, and water as main components; (Relating to a jet ink composition characterized in that it contains at least one type of water-soluble quenching substance.

The water-soluble proteins used in the present invention are readily available commercially. Particularly suitable are casein and/or d, sonoum caseinei!・It is.

The water-soluble protein is preferably present in an ink composition containing a water-soluble dye, a wetting agent, and water as main components.
Contains a range of 7 to left weight. If the amount of water-soluble tongue/grill used is too small - 1.
The effect of improving optical properties cannot be obtained. On the contrary, too much is also undesirable since it tends to lower the color rendering properties and cause nozzle clogging due to precipitates.

Further, as the water-soluble dye used in the aqueous noet ink composition of the present invention, only those having good solubility in water are used. However, the effect of the present invention is that a stronger addition effect can be achieved in dyes with weak light resistance.

Examples of the water-soluble dye include C,LDirect Blue 23, C,1,
Dirct Blue, 203+C, LDirec
tBlue ;102. C01, Direct
Blue /IC, r-Acid Blue? ,
C,1,Ac1d Blue LC-1,Dire
ct Blue /99. C,1,Ac
1d Yellow/.

C-], Direct Red, 2.27. C
,LDircct Red ,2.23+C2 block A
Cid Red g7. C.L.A.
cid Red 9:l.

C, 1, Ac1d Red 32. C.LAc
id Red 9/I.

C, T, Ac1d Red 2g9+ C, T, D
Direct Black k/waste is mentioned.

However, in the present invention, a wetting agent that is liquid at room temperature is used. Specifically, the wetting agent is poly(+lli alj −
Examples of the 3 class are noethylene glycol, 1,1 ethylene glycol, and 7j? Reethylene Recall 8 Recall ≠ 30
0, Glycerin, 70 mouths) E-lene glycol, etc., alkino 1/ether/l/types of polyhydric alcohols and 0
: The acetic acid esters, such as ethylene glycol/lemononotyl ether, noethylene glycol, motubutyl ether, ethylene glycol monomethyl ether acetate, 1-1 liters, 970 ports, 1 sink, 8 glycol methyl ether formamides, such as alkyl /Karari; or JP-A Showa 0-/θ. ．． N-vinyl pyrrolidone oligomers synthesized by the method described in Jul. 2007, E. J. Print 'I #H, etc. are used.

These wetting agents (c) can be used alone or in combination.

On the other hand, another aspect of the present invention includes an aqueous jet ink composition further containing a water-soluble quencher.

In this embodiment, the above-mentioned quenching substance, that is, a substance that deactivates the fluorescence of an excited substance by interaction, is 5 C Kyoritsu Shuppan Co., Ltd., Chemistry Dictionary/F6'l, 7th page]. is a water-soluble iodide □Potassium,
At least one compound selected from potassium bromide, potassium chloride, potassium thionoanate, cobalt sulfate, copper sulfate, ferrous sulfate, nickel sulfate and nickel oxalate is used.

Among these, it is particularly preferable to use at least one of potassium iodide, potassium bromide, copper sulfate, cobalt sulfate, and potassium thio7anate.

The quenching substance can be a water-soluble dye, a wetting agent, a water-soluble tan, or a water-soluble dye.
Preferably 0.7~
The content shall be within the range of the sea weight ratio. If the amount of water-soluble quenching substance used is too small, the lightfastness - I
- No effect. On the other hand, if the amount is too high, the color rendering properties may deteriorate and the nozzle may be clogged with precipitates, so it is also not preferable.

The aqueous jet ink adhesive composition of the present invention has, for example, the following formulation. Water-soluble dyeing agent 10. /~/weight, wetting agent~/I-0 weight, water-soluble protein 0
．． Between 7 and S, if necessary, a self-water-soluble quenching substance 0.
7~3-Weighter, remaining water.

Note that the aqueous ink composition of the present invention, such as "Double", preferably has a viscosity of a to 30 centipoise and a non-volatility ratio of 0 to 0% by weight from the viewpoint of practical use in an ink jet system. It's scary.

Further, although the TIJ + iJ ability of inks such as 1) II can vary widely, depending on the type of quenching substance and 1) II, precipitation may occur, so it is preferable to adjust the ink as appropriate.

For example, copper sulfate 1) II /7 or less or ammonia solution with pl+ 70. ,! It is preferable to use it by adjusting it to more than i.

The aqueous jet ink composition of the present invention may further contain, if necessary, a water-soluble solvent, such as nooxane, acetone, noacetone alcohol, alkyl alcohol porumamide having up to 3 carbon atoms, and trimethylsulfur N-methylene. One or two types of lucopyrrolidone etc.
may be used.

If necessary, as surface tension modifiers, nonohethionic surfactants such as sodium alkyl sulfate, etc.; anionic surfactants such as 11,911 evaalkylpyridium sulfates; The ion 4' may be a surfactant, such as a polyoxyethylene alkyl ether.

Furthermore, if necessary, hydrophilic cellulose, carboxymethylcellulose, loxethylcellulose, polyvinyl alcohol/, 2-benzisothiazolin-3-one amine J'f % -acetoxy,), l/-methyl- It is also possible to add a small amount of a fungicide such as m-nooxane or a preservative.

Oxygen absorbers such as sodium sulfite, sodium bisulfite, etc. can also be used in combination.

The aqueous sheet ink composition of the present invention thus obtained completely satisfies the requirements and performances of the ink wet method, such as prevention of nozzle clogging. Furthermore, the light resistance of the recorded material is significantly improved. In addition, it is possible to expand the so-called selection range, such as using water-soluble dyes among each.

As a result of the above, its industrial effects are immeasurable.

Hereinafter, the present invention will be specifically explained with reference to Examples.

However, there is no intention to limit it to these specific examples.

Examples/~7.2 At various ratios as shown in Table 7, ink raw materials were mixed at 0. The mixture was stirred and mixed over the evening hours to dissolve each antiphase in water. Then, the mixture was filtered under pressure through a membrane filter (8 Ωμ) manufactured by LRA Co., Ltd. to obtain an aqueous jet ink composition.

These aqueous sheet ink compositions are then continuously recorded using an or-additional inkjet printer.
The continuous ejection stability is determined by the recording state after 700 hours and the printing quality of the recorded material. Regarding the light resistance, the recorded matter was irradiated for a specified time using a Gisenon fade meter (manufactured by Suga Test Instruments Co., Ltd.) (irradiation energy: 2 hours), then the reflection density was measured (Macbeth). The degree of discoloration was compared based on the ratio of optical density to the initial value (/θ0) using RI) 9/3) manufactured by Co., Ltd. The results obtained are shown in Table 1.

Comparative Examples 7 to 3 Aqueous soot ink compositions were prepared using the compositions shown in Table 1, which were conventionally thought to have good surface J-light properties, in the same manner as in the above Examples. The resulting composition was tested for continuous spray stability and light resistance in the same manner as in the Examples.

As is clear from the droplets in Table 1 above, the jet ink composition of the present invention has good continuous jetting stability without impairing the jetting characteristics in the inkjet system, and also has remarkable light resistance of recorded materials. Are better.

538-

Claims (1)

[Scope of Claims] 11) A water-based noet ink composition containing a water-soluble dye as a main component, a wetting agent, and water, further comprising a water-soluble dye/.
A jet ink composition comprising at least one type of abrasive. (2) The jet ink composition according to claim 11, wherein the water-soluble protein substance is casein and/or sonorum caseinate. (3) The water-soluble protein is present in the shet ink composition. The jet ink composition according to claim (1), which contains a large amount of tod. (4) A water-based jet ink composition containing a water-soluble dye, a wetting agent, and water as main components, further comprising a nitrate containing at least one water-soluble protein and at least one water-soluble quenching substance. Jet ink composition. (5) The water-soluble tanning substance is casein and/or the water-soluble protein is sonorum caseinate.
4) The jet ink composition described in item 4). (6) The jet ink composition according to claim (4), wherein the water-soluble protein is contained in the jet ink composition in an amount of 0.7 to 3 weight percent. (The water-soluble quenching substance is 0 in the jet ink composition.)
．． Claim No. 7 (4)
The jet ink composition described in . (8) Water-soluble quenching substances include potassium iodide, potassium bromide, potassium chloride, potassium thiocyanate,
The jet ink composition according to claim 4, which is at least one selected from cobal sulfate, copper sulfate, ferrous sulfate, nickel sulfate, and nickel oxalate.