JP2000191964A - Hot melt type ink composition for ink jet and its recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid ink composition using a pigment, used for ink jet printers, and contriving both non-separated high stability and highly reliable print quality, and to provide a method for recording. SOLUTION: This ink composition comprises a pigment and either of 4-50 wt.% of a polyamide, 5-30 wt.% of an alicyclic saturated hydrocarbon resin, and their mixture, is used by thermally liquidizing the ink composition solid at room temperature, and then jetting the liquidized ink composition to form dots. The surfaces of the ink drops formed on the recording medium are flattened by a heating means and/or a pressing means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-melt ink composition used for, for example, an ink-jet recording apparatus and a recording method thereof.

[0002]

2. Description of the Related Art Conventionally, a water-soluble liquid ink composition has been widely used as an ink composition for ink jet recording. However, printing on paper where ink tends to soak causes "bleeding", and the recording medium is limited to processed paper. Also, an overhead projector (hereinafter OH)
Even when recording on a sheet (hereinafter referred to as P), a special treatment is required for the sheet surface because the drying property of the ink is poor. For this reason,
As an ink composition that provides good printing quality regardless of paper quality, using a hot melt ink composition made of a solid wax or the like at room temperature, liquefied by heating or the like, and injected by applying some energy, There has been proposed a hot-melt ink jet recording method in which a recording dot is formed by cooling and solidifying while adhering to a recording medium.

As a major advantage of the above-mentioned ink-jet method, the ink is solid at room temperature, so that it does not stain during handling, and the amount of evaporation of the ink during melting can be minimized, so that there is no clogging of nozzles. Further, since the ink is solidified immediately after the adhesion, there is no "bleeding", and various recording media such as Japanese paper, drawing paper, and postcards can be used without any pretreatment.

As a precedent for these inks, US Pat.
Nos. 391,369 and 4,484,948 describe ink compositions that provide good print quality regardless of paper quality. JP-A-6-107987 and JP-A-5-311101 describe a hot-melt ink composition for inkjet which uses polyamide and fatty acid amide and has excellent light transmittance. Furthermore, JP-B-7-115470 describes a thermoplastic composition comprising a chain aliphatic hydrocarbon and an oil-soluble dye. In Japanese Patent Publication No. 6-74393, 1
Compositions containing specific resin binders at 50 ° C. of 250 mPa · s or less have been reported.

On the other hand, in order to improve the weather resistance of the printed matter,
Generally, a pigment is used as a colorant for the ink, and is used as ink for various printers such as a laser printer, a fusion transfer printer, a liquid inkjet printer, and a hot melt inkjet printer.

For example, Japanese Patent Laid-Open No. 3-37278 discloses a pigment ink used in a hot-melt type ink jet printer.
JP-A-4-339871, JP-A-5-16343, JP-A-5-
No. 105832, JP-A-6-49400, JP-A-6-228479, JP-A-6-228480, JP-A-6-306319, JP-A-7-10943
2, JP-A-7-196968, JP-A-7-278477, JP-A-7
-306319, JP-A-7-316479, JP-A-7-331141,
Many reports have been made, such as JP-A-8-295836.

Further, Japanese Patent Application Laid-Open No. 61-159470 reports a method of improving the image quality when an image on a transparent recording medium is projected, by flattening the surface shape of ink droplets.

[0008]

However, since the hot-melt ink composition contains wax as a main component, its penetration into paper is limited by the speed of solidification after adhesion, resulting in poor adhesion to a recording medium. There was a problem that the ink peeled off from the recording medium when the image was bent, and sufficient recording storage performance could not be obtained.

In the thermal transfer method, as disclosed in JP-A-2-108592, a polyamide resin is added to an ester wax having a penetration of 3 or less and high hardness, or
As disclosed in Japanese Patent Application Laid-Open No. 6-74393, there is a method of applying a recording medium having a high adhesive strength using a polyamide composition. However, in the hot-melt ink-jet method, since the ink droplets are ejected from fine nozzles, the viscosity thereof is 90.
It is necessary to adjust below 50 mPa · s at ~ 130 ° C,
It is necessary to select a material having low viscosity and excellent flow stability during melting. In addition, since the nozzle substrate and the ink come into contact with each other at a high temperature for a long time, it is an absolute condition that the ink composition does not corrode.In addition, the ink must always be ejected to the correct position on the nozzle surface. In addition, the ink composition has a sufficient surface tension and cohesive force to prevent the ink droplets from scattering while the ink is flying on the recording medium. Specific conditions that apply.

In the hot-melt ink jet method, in order to improve poor adhesion, a method of fixing ink onto a recording medium by pressing a semicircular ink droplet fixed to the recording medium surface from above and below with a roller, etc. However, a wax having a penetration of 3 or less has too high a hardness and requires a considerable pressure, which is not preferable. However, it is essential to flatten the ink drops.

Further, the hot melt ink composition has a drawback that it is generally difficult to maintain compatibility between components, and it is easy to separate in a molten state when an organic pigment having excellent weather resistance is used as a coloring agent. Was. As is well known, the sedimentation of the particles dispersed in the liquid changes depending on the particle size of the particles, the viscosity of the dispersion medium and the sedimentation time, and the higher the viscosity of the dispersion medium, the more difficult the sedimentation. On the other hand, when printing with an ink-jet printer, the lower the viscosity of the ink used, the higher the speed and the higher the density, which is advantageous for high-reliability printing. there were.

As described above, the hot-melt ink-jet recording method using an organic pigment having excellent weather resistance as a colorant has many advantages as compared with the ink-jet recording method using a dye. ,
It is expected to be applied not only to facsimile and the like, but also to indoor and outdoor posters, large signboards, car, glass, elevators, wall and building decoration, and printing on fabric. However, as described above, there is a problem that ink separation and high-reliability printing quality cannot be achieved at the same time, and this has been a bottleneck in commercialization.

It is an object of the present invention to use a pigment which is low in viscosity and excellent in flow stability and has no separation, which is sufficient for ejecting ink droplets from fine nozzles, and which can be heated or pressurized. An object of the present invention is to provide an ink composition for a solid ink jet printer which is easy and thereby improves the adhesion to a recording medium, abrasion, and gloss of an image.

[0014]

The gist of the present invention to solve the above-mentioned problems is that a solid ink composition is liquefied by heating at room temperature, and then ink droplets are ejected onto a recording medium by some ejection energy. A hot-melt ink composition for ink-jet for forming recording dots, wherein the ink composition contains 4 to 50% by weight of a pigment and rimamide;
It is to contain 5 to 30% by weight of the alicyclic saturated hydrocarbon resin or at least one component selected from a mixture thereof.

The polyamide preferably has a melt viscosity at 130 ° C. of 8 to 250 mPa · s, and the alicyclic saturated hydrocarbon resin has a softening point of 70 to 125 ° C.

Further, in the recording method of the present invention, the surface of the ink droplet is re-formed flat by heating and / or pressurizing the ink composition on the recording medium.

According to Kitahara, "Elucidation of Dispersion / Agglomeration and Applied Technology" Techno System (1996), the behavior expressed by the following equation with respect to the settling time t of spherical dispersed particles in a liquid is basically known.

[0018]

(Equation 1) Here, η: viscosity, H: settling distance, ρ: dispersed particle density,
ρ ₀ : dispersion medium density, D: dispersion particle diameter, g: gravitational acceleration.

In an actual system, the above equation may quantitatively deviate, but as a general tendency, the sedimentation time of dispersed particles changes almost in proportion to the viscosity when other conditions are constant. The sedimentation velocity tends to be almost inversely proportional to the viscosity. For this reason, it is desired that the viscosity be higher in order to obtain an ink which is less likely to settle and has good dispersion stability. However, for use as an ink, an appropriate range for the viscosity is set according to the characteristics of the printer, which is usually 10 to 30 mPa · s, but is generally soluble in a solvent (vehicle) as a colorant. When a pigment having a low viscosity was used, it was difficult to set conditions that satisfied both the viscosity range and the sedimentation velocity.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The polyamides of the present invention are generally classified into aromatic polyamides and dimer acid polyamides. In the present invention, polyamides based on dimer (dimer) acids are particularly desirable. Optimally, the base acid is oleic, linoleic, linoleic or eleostearic acid.

Specifically, versamide 711, versamide 7
25, Versamide 930, Versamide 940, Versamide 335,
Versamide 335-10, Versamide 335-11, Macromelt J
P415, Bar Salon 1117, Bar Salon 1138, Bar Salon 1
300 (made by Henkel), Tomide 391, Tomide 39
3, tomide 394, tomide 395, tomide 397, tomide 509, tomide 535, tomide 558, tomide 560, tomide 1310, tomide 1396, tomide 90, tomide 92 (Fuji Kasei), SYLVAMICD E
-5 (made by Arizona Chemical), UNIREZ 2224, UNIREZ 2970
(Manufactured by Union Camp), N,
N'-ethylenebisoleic acid amide, N, N'-xylenebisstearic acid amide and the like are selected. At least one kind of these or two or more kinds can be used in combination.

The polyamide has a melt viscosity at 130 ° C. of from 8 to 250 mPa · s, preferably from 10 to 150 mPa · s. All of these have good wettability to the recording medium,
Shows high adhesive performance. The deformation of the ink droplet due to pressurization is also easy. Furthermore, it has excellent compatibility with other ink components and excellent adhesion to a wide variety of recording medium materials. The addition amount is preferably 4 to 50% by weight, and most preferably 5 to 40% by weight.
% By weight. If the content is more than 50% by weight, the viscosity of the ink increases and it becomes difficult to eject the ink. If the amount is less than 4% by weight, the adhesion to the recording medium becomes insufficient, and the storage performance deteriorates.

The alicyclic saturated hydrocarbon resin of the present invention is selected from tackifier resins having excellent heat resistance and weather resistance.

Specifically, Archon P-70, Archon P-9
0, Archon P-100, Archon P-115, Archon, Archon P-125, Archon M-90, Archon M-100 (all manufactured by Arakawa Chemical). At least one kind of these or two or more kinds can be used in combination.

According to Arakawa Chemical Industrial Review, since the adhesive force is proportional to the molecular weight, the addition of a tackifier resin having a smaller molecular weight than the polymer lowers the average molecular weight of the system, which is disadvantageous in terms of the adhesive force. Although it may be, usually, the polymer has a high molecular weight, so that the system is very difficult to deform and the effective contact area is extremely reduced. Therefore, in order to increase the apparent adhesive strength, a tackifier resin is added. This is because the composition must be stable so that the softening point is 70-1.
A range of 00 ° C. is desirable for the apparatus. The addition amount is preferably 5 to 30% by weight, and most preferably 8 to 20% by weight. If the content is more than 30% by weight, the viscosity of the ink increases, and it becomes difficult to eject. If the amount is less than 5% by weight, the adhesion to the recording medium becomes insufficient, and the storage performance deteriorates.

The ink composition containing the polyamide and the alicyclic saturated hydrocarbon of the present invention exhibits good compatibility with fatty acid ester amides and saturated or unsaturated fatty acid amides.
The properties can be improved by mixing and using. In addition, for example, petroleum wax such as candelilla wax, carnauba wax, vegetable wax represented by wood wax, paraffin wax, microcrystalline wax, etc., polyethylene wax, stearic acid, benric acid, higher saturated or unsaturated. Fatty acids, ketones such as stearone and laurone, fatty acid esters, glycerides and the like can be used as a mixture.

As the fatty acid ester amide, for example, Kawaslip SA is selected.

Examples of the fatty acid amide include N-substituted fatty acids such as lauric acid amide, stearic acid amide, oleic acid amide, erucic acid amide, ricinoleic acid amide, stearic acid ester amide, palmitic acid amide, behenic acid amide, brassic acid amide and the like. As an amide, N, N'-
2-hydroxystearic acid amide, N, N'-ethylenebisoleic acid amide, N, N'-xylenebisstearic acid amide, stearic acid monomethylolamide, N-oleylstearic acid amide, N-stearylstearic acid amide, N -Oleyl palmitamide, N-stearyl erucamide, N, N'-dioleyl adipamide, N, N'-dioleyl sebacamide, N, M'-distearyl isophthalamide, 2-stearamide Ethyl stearate is selected.

Fatty acid amides have a low melt viscosity at around 100 ° C., and the melting point of the ink and the decrease in the viscosity during melting are remarkable. In addition to the stable fluidity during ink melting,
It has enough strength to withstand rubbing, folding or bending printed images. In addition, fatty acid esters have low melt viscosity and, besides being stable in fluidity at the time of ink melting,
Compared to the carbon-carbon bond, it has high flexibility and high surface protection, and therefore can withstand bending of a printed image.

The fatty acid ester is preferably a monohydric or polyhydric alcohol fatty acid ester. For example, sorbitan monopalmitate, sorbitan monostearate, sorbitan monobehenate, polyethylene glycol monostearate, polyethylene glycol distearate, propylene glycol monostearate, ethylene glycol distearate and the like are selected.

Specifically, Reodol SP-S10, Reodol SP-S30, Reodol SSA10, Emazol P-10, Emazol S-10, Emazol S-20, Emazol B, Rheodol Super SP-S10, Emanone 3199, Emanone 329
9. Exepearl PE-MS (Kao) can be used.

[0032] Even more preferred are fatty acid esters of glycerin. For example, stearic acid monoglyceride, palmitic monoglyceride, oleic acid monoglyceride, behenic acid monoglyceride and the like are selected.

More specifically, Reodol MS-50, Reodol MS-60, Reodol MS-165, Reodol MO-60, Exepearl G-MB (Kao), Synchro Wax ERL-C,
Synchro wax HR-C (Kuroda) and KF2 (Kawaken Fine Chemicals) can be used.

Further, as the special ester wax, Exepearl DS-C2 (Kao), Kawaslip-L, Kawaslip-R (Kawaken Fine Chemicals) and the like are also selected.
Myrisyl citrate, seryl citrate, seryl montanate, myricyl palmitate, myricyl stearate,
Higher alcohol esters of higher fatty acids such as cetyl palmitate and cetyl stearate are also selected. Preferred fatty acid esters are those having a viscosity at the time of injection of less than 20 mPa · s. Among the plant waxes, deodorized purified carnauba wax No. 1, Purified candelilla wax No. 1
(Noda wax) is suitable.

Further, high molecular weight resins such as rosin resin, polyester, polyvinyl acetate, acrylic acid and methacrylic acid polymer, styrene polymer, ethylene vinyl acetate copolymer, polyketone, silicone, and coumarone are added. You can also.

Polyester KTR2150 (all manufactured by Kao) and polyvinyl acetates AC401, AC540, AC580
(Made by Allied Chemical), silicone SH6018 (made by Toray Silicone), silicone KR215,
Silicone KR216, Silicone KR220 (all made by Shin-Etsu Silicone), and Esklon G-90 (made by Nippon Steel Chemical) as Coumalon can be used.

As the colorant, a pigment which is well dispersed in the above-mentioned vehicle and has excellent heat stability is desirable. Although not particularly limited, for the present invention, for example, the following organic or inorganic pigments described in the color index can be used.

As a red or magenta pigment, Pigmen
t Red3, 5, 19, 22, 31, 38, 43, 48: 1, 48: 3, 48:
4, 48: 5, 49: 1, 53: 1, 57: 1, 57: 2, 58: 4, 63:
1, 81, 81: 1, 81: 2, 81: 3, 81: 4, 88, 104, 108, 1
12, 122, 123, 144, 146, 149, 166, 168, 169, 170, 1
77, 178, 179, 184, 185, 208, 216, 226, 257, Pigmen
t Violet3, 19, 23, 29, 30, 37, 50, 88, Pigment Ora
nge13, 16, 20, 36, as a blue or cyan pigment, Pig
ment Blue1,15,15: 1,15: 2,15: 3,15: 4,15:
6, 16, 17-1, 22, 27, 28, 29, 36, 60, as a green pigment, Pigment Green 7, 26, 36, 50, as a yellow pigment, Pi
gment Yellow1, 3, 12, 13, 14, 17, 34, 35, 37, 55,
74, 81, 83, 93, 95, 97, 108, 109, 110, 128, 137, 1
38, 139, 153, 154, 155, 157, 166, 167, 168, 180, 1
85, 193, and as the black pigment, Pigment Black 7, 28, 26, etc. can be used according to the purpose.

Specific examples of trade names include, for example, Chromofine Yellow 2080, 5900, 5930, AF-1300, 2700L,
Chromo Fine Orange 3700L, 6730, Chromo Fine Scarlet 6750, Chromo Fine Magenta 6880, 688
6, 6891N, 6790, 6887, Chromofine Violet R
E, Chromofine Red 6820, 6830, Chromofine Blue HS-3, 5187, 8108, 5197, 5085N, SR-5020, 50
26, 5050, 4920, 4927, 4937, 4824, 4933GN-EP, 494
0, 4973, 5205, 5208, 5214, 5221, 5000P, Chromofine Green 2GN, 2GO, 2G-550D, 5310, 5370, 6830,
Chromo Fine Black A-1103, Seika Fast Yellow 10GH, A-3, 2035, 2054, 2200, 2270, 2300, 2400
(B), 2500, 2600, ZAY-260, 2700 (B), 2770, Seika Fast Red 8040, C405 (F), CA120, LR-116,
1531B, 8060R, 1547, ZAW-262, 1537B, GY, 4R-401
6, 3820, 3891, ZA-215, Seika Fast Carmine 6B14
76T-7, 1483LT, 3840, 3870, Seika Fast Bordeaux
10B-430, Seika Light Rose R40, Seika Light Violet B800, 7805, Seika Fast Maroon 460N, Seika Fast Orange 900, 2900, Seika Light Blue C
718, A612, cyanine blue 4933M, 4933GN-EP, 4940,
4973 (all manufactured by Dainichi Seika Kogyo), KET Yellow401, 402, 4
03, 404, 405, 406, 416, 424, KET Orange501, KET Re
d301, 302, 303, 304, 305, 305, 306, 307, 308, 30
9, 310, 336, 337, 338, 346, KET Blue 101, 102, 103,
104, 105, 106, 111, 118, 124, KET Green 201 (all manufactured by Dainippon Ink and Chemicals), Colortex Yellow 301, 314, 315,
316, P-624, 314, U10GN, U3GN, UNN, UA-414, U26
3, Finecol YellowT-13, T-05, Pigment Yellow170
5, Colortex Orange 202, Colortex Red 101, 103, 115,
116, D3B, P-625, 102, H-1024, 105C, UFN, UCN, UB
N, U3BN, URN, UGN, UG276, U456, U457, 105C, USN, C
olortex Maroon601, Colortex BrownB610N, Col
ortex Violet600, Pigment Red122, Colortex Black70
2, U905 (above Sanyo Dye), Lionol Yellow1405G, Lio
nol Blue FG7330, FG7350, FG7400G, ES, ESP-S (manufactured by Toyo Ink), Toner MagentaE2G (manufactured by Hoechst Industries), carbon black # 2600, # 2400, # 23
50, # 2200, # 1000, # 990, # 980, # 970, # 960, #
950, # 850, MCF88, # 750, # 650, MA600, MA7, MA8,
MA11, MA100, MA100R, MA77, # 52, # 50, # 47, # 4
5, # 45L, # 40, # 33, # 32, # 30, # 25, # 20, # 1
0, # 5, # 44, CF9 (all manufactured by Mitsubishi Chemical) and the like.

As a coloring agent, a soluble dye (Solvent Dy)
e) can also be used together. Any colorant, such as an oil dye, can be used as long as it is compatible with the other ink components.

The appropriate amount of pigment to be added is 0.2 to 5.0% by weight of the ink. Particularly desirable is 0.5 to 3% by weight.
It is. If it is less than 0.2% by weight, the image quality deteriorates, and if it is more than 5% by weight, ink viscosity characteristics are adversely affected. In addition, two or more colorants can be mixed and used as needed for color adjustment and the like.

In order to further develop functionality in the ink composition of the present invention, various surface treatment agents, surfactants, viscosity reducing agents, antioxidants, antioxidants, crosslinking accelerators, ultraviolet absorbers, plasticizers , A preservative, a dispersant, a dye, and the like.

For mixing and dispersing the above-mentioned vehicle, colorant and other components, various known pulverizing or dispersing apparatuses can be used without any particular limitation. These include a high-speed rotation mill, a roller mill, a container driving medium mill, a medium stirring mill, a jet mill, and the like.For example, a high speed disperser, an impeller disperser, a gate mixer, a bead mill, a sand mill, a pearl mill, a cobra mill, a pin mill ,
Molinex Mill, Stirring Mill, Universal Mill, Century Mill, Pressure Mill, Agitator Mill, Two Roll Extruder, Two Roll Mill, Three Roll Mill, Nitche Mill, Kneader, Mixer, Colloid Mill, Stone Mill, Cadie Mill, Planetary Mill, Ball Mill , Paddle mixer, attritor, flow jet mixer, slasher mill, peg mill, microfludizer, CLEARMIX, rhino mill, homogenizer, bead mill with pins, horizontal bead mill, and the like.

The kneading time is set variously by the apparatus.
For kneading, a method in which well-known components are melt-kneaded all at once, a method in which a coloring agent is previously mixed at a high concentration and diluted into a master batch, a method in which components are sequentially added and mixed, and a method in which a component is dispersed in a liquid and dispersed in a solid phase Various methods used for paint, ink, resin coloring, etc., such as a flash method to be introduced, can be used.

The preparation of high quality ink jet inks requires a balance of many important factors. The ink of the present invention satisfies several well-known requirements for application to hot melt inkjet printers. That is, the ink has sufficient hardness and stability at room temperature, and has high reliability in storage before printing and image quality after printing. After attaching to a recording medium, it has sufficient transparency and saturation, and forms a uniform thin film to give a printed matter of good image quality. While these requirements are complex and cannot always be clearly quantified for the inks of the present invention, for example, hot melt inks with relatively low melting points are typically susceptible to bleed and offset. Even when stored at 40 ° C., it is necessary that offset does not occur in a state where printed matters are stacked. However, the higher the melting point of the ink, the higher the viscosity,
The melt viscosity at the time of printing is 50 mPa · s or less, especially 5 to 3
A range of 0 mPa · s is desirable. Excessive viscosity requires a large amount of energy at the time of injection, and a material having too low a viscosity causes a problem in storage stability at room temperature. Room temperature (25
° C) is 10,000 Pa · s.

The bending property of the printed matter is 5 in a mandrel test using a transparency film.
It is desirable to pass the test of not more than mmφ, especially not more than 3 mmφ. The temperature at which the ink is melted during printing is optimally in the range of 100 to 150 ° C. in order to make the apparatus simple and inexpensive. The surface tension during melting is desirably 40 mN / m or less. The volume change upon transition from the molten state to the solid is 1
0% or less is desirable.

Further, the composition can be used to eject ink droplets only when printing is required. Heretofore known ink jet printers, for example, office printers, printers used for industrial marking, and wide format printers It can be used for plate and plate making printers, label printers and all types of printers having this typical operation.

As the recording medium, paper, plastic film, capsule, gel, metal foil, glass, wood, cloth, etc. can be mentioned. It is not limited to this. A method of once recording on a transfer body and transferring it to a recording medium, and a recording method including a process such as a pressurizing and heating device can also be used.

Further, a recording method is selected in which the ink composition of the present invention re-forms the surface of the ink droplets flat by heating or / and pressing on the recording medium.

Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to the examples.

Table 1 shows the evaluation results of the ink composition, viscosity and dispersibility.

[0052]

[Table 1] Table 2 shows composition materials of inks used, manufacturer names, trade names, etc., and FIG. 1 shows melting temperatures of various polyamides.

[0053]

[Table 2] Example 1 Carnauba wax No. 1 was used as a vehicle. 1
86% by weight (manufactured by Noda Wax), 4% by weight of polyamide (manufactured by Henkel, trade name: Versamide 335-10), 5% by weight of alicyclic saturated hydrocarbon (manufactured by Arakawa Chemical, trade name: Archon P-115) 2% by weight of an antioxidant (manufactured by Yoshitomi Pharmaceutical, trade name: Yoshinox 2246G), yellow pigment (manufactured by Dainichi Seika Kogyo, trade name: Seika Fast Yellow 2200) 3 as a colorant
The mixture containing 400% by weight was heated and kneaded with an attritor (MA01SC manufactured by Mitsui Mining Co., Ltd.) at 130 ° C. until a homogeneous molten mixture was obtained (about 5 hours). Was removed and allowed to cool at room temperature to obtain a homogeneous yellow hot melt ink composition.

This yellow hot melt ink composition was
The mixture was heated to 30 ° C., and the melt viscosity was measured using a rotational viscometer (EDI model manufactured by Tokimec). The average value measured five times was 10 mPa · s.

The penetration of the composition was measured using a penetrometer (NIKKA
ENGINEERING). When measured with a 200 g weight for 30 seconds with a wax needle, the penetration was 7, and thus it was sufficiently flattened, and the adhesion to the recording medium, abrasion, and the gloss of the image were good. .

This ink was put into an ink jet printer (manufactured by Hitachi Koki Co., Ltd., model name: JOLT SJ01A), and it was confirmed that all the ink was jetted from 96 nozzles. Inspection of the number of nozzles that would not be possible when the test was performed confirmed that all of the nozzles could be ejected without any problem.

Further, when the ink (about 10 g) placed in a test tube having a diameter of 12 mm was left at 135 ° C. while being melted,
No separation was observed in the dispersion after one week. Example 2 10% by weight of an ester amide (manufactured by Kawaken Fine Chemicals, trade name: Kawaslip SA) as a vehicle, 50% by weight of a polyamide (manufactured by Nippon Kasei, trade name: Slipax O), and 30 of Alcon P-115 were used as vehicles. Wt%, rosin ester (Arakawa Chemical, trade name: pine crystal
K-100) and a red pigment (manufactured by Dainichi Seika Kogyo, trade name: Chromofine Magenta 6880) or a black pigment (manufactured by Mitsubishi Chemical Corporation, trade name: carbon black MA7) as a colorant.
7) A total of 500 g of the mixture containing 5% by weight of each mixture was treated with CLEARMIX (Seiko Easy & G MA01SC type) for 130 g.
℃, kneading (about 3 hours) until a homogeneous molten mixture is obtained, followed by filtration under heat and pressure to remove impurities, etc., and allowed to cool at room temperature to obtain a homogeneous magenta and black hot melt ink composition I got something.

Each of the hot melt ink compositions was heated to 130 ° C., and the melt viscosity was measured using a rotational viscometer (EDL model manufactured by Tokimec) in the same manner as in Example 1.
The average value measured five times was 12, 15 mPa · s, respectively.

The penetration of the magenta and black hot melt ink compositions was 13 and 14, respectively, so that they could be sufficiently flattened and had good adhesion to the recording medium, abrasion, and gloss of the image. Was.

This ink was placed in an ink jet printer in the same manner as in Example 1, and it was confirmed that the ink had been ejected. The number of nozzles which became impossible when left in a molten state for 3 days and ejected again was examined. As a result, it was confirmed that the fuel was injected without any problem.

Further, when the ink placed in a test tube having a diameter of 12 mm was left at 135 ° C. while being melted in the same manner as in Example 1, no separation was observed in the dispersion for one week. Example 3 40% by weight of Kawaslip SA as a vehicle, 20% by weight of a fatty acid ester (manufactured by Kuroda, trade name: Synchro Wax ERL-C), and 20% by weight of a polyamide (manufactured by Union Camp, trade name: UNIREZ 2970) %, Alicyclic saturated hydrocarbon (Arakawa Chemical, trade name: Archon P-70)
10% by weight of polyvinyl acetate (made by Allied Chemical,
8% by weight of trade name: AC401 and a blue pigment as a colorant (manufactured by Dainichi Seika Kogyo Co., Ltd., trade name: Chromofine Blue 49)
73), 0.2% by weight, blue dye (manufactured by Daiwa Chemicals, trade name:
Oleosol Fast Blue GL) (1.8% by weight) and a total of 500 g of the mixture containing 130 g of the mixture were stirred by a stirring mill (manufactured by Kurimoto Iron Works).
℃, heated and kneaded until a homogeneous molten mixture was obtained (about 6 hours), followed by filtration under heating and pressure to remove impurities and the like, and allowed to cool at room temperature to obtain a homogeneous cyan hot melt ink composition. Obtained.

The hot melt ink composition was heated at 130 ° C.
, And the melt viscosity was measured in the same manner as in Example 1 using a rotational viscometer (EDL model manufactured by Tokimec). The average value measured five times was 11 mPa · s.

Since the penetration of this cyan hot melt ink composition was 14, it could be sufficiently flattened, and the adhesion to the recording medium, the abrasion and the gloss of the image were good.

This ink was put into an ink jet printer in the same manner as in Example 1, and ink was ejected from all nozzles.
It was confirmed that even after being left in a molten state for a day, the fuel was sprayed without any problem.

Further, as in Example 1, when the ink put in a test tube having a diameter of 12 mm was left at 135 ° C. while being melted, no separation was observed in the dispersion for one week. Example 4 60% by weight of Kawaslip SA as a vehicle, 20% by weight of Slipax O as a polyamide, UN
10% by weight of IREZ 2970, 8% by weight of alicyclic saturated hydrocarbon (manufactured by Arakawa Chemical Co., trade name: Alcon M90), and 2% by weight of blue pigment Chromofine Blue 4973 as a colorant
Stirring mill (made by Kurimoto) with 500g of the mixture
At 130 ° C. until a homogeneous molten mixture is obtained, followed by kneading (about 6 hours), followed by filtration under heating and pressure to remove impurities and the like, and left to cool at room temperature to obtain a homogeneous cyan hot melt ink. Obtained.

This hot melt ink was heated to 130 ° C., and a rotational viscometer (EDL manufactured by Tokimec) was used in the same manner as in Example 1.
) Was used to measure the melt viscosity. The average value measured five times was 13 mPa · s.

Since the penetration of the cyan hot melt ink composition was 12, it could be sufficiently flattened, and the adhesion to the recording medium, the abrasion and the gloss of the image were good.

This ink was put into an ink jet printer in the same manner as in Example 1, and ink was ejected from all nozzles.
It was confirmed that even after being left in a molten state for a day, the fuel was sprayed without any problem.

Further, as in Example 1, when the ink put in a test tube having a diameter of 12 mm was left at 135 ° C. while being melted, no separation was observed in the dispersion for one week. Example 5 A mixture containing 50% by weight of Kawaslip SA as a vehicle, 25% by weight of Sripax O, 20% by weight of Pine Crystal K-100, and 5% by weight of Chromofine Magenta 6880 as a colorant 500 in total.
g Clear Mix (MA01SC made by Seiko Easy & G)
The mixture is heated and kneaded at 130 ° C until a homogeneous molten mixture is obtained (approximately 3 hours), followed by filtration under heating and pressure to remove impurities and the like. An ink composition was obtained.

This magenta hot melt ink composition was heated to 130 ° C., and the melt viscosity was measured using a rotational viscometer (EDL model manufactured by Tokimec) in the same manner as in Example 1.
The average value measured five times was 12 mPa · s.

Since the penetration of the magenta hot melt ink composition was 10, it could be sufficiently flattened, and the adhesion to the recording medium, the abrasion, and the gloss of the image were good.

This ink was placed in an ink jet printer in the same manner as in Example 1, and it was confirmed that the ink had been ejected. The number of nozzles that became impossible when left in a molten state for 3 days and ejected again was examined. As a result, it was confirmed that the fuel was injected without any problem.

Further, as in Example 1, when the ink put in a test tube having a diameter of 12 mm was left at 135 ° C. while being melted, no separation was observed in the dispersion for one week. Example 6 As a vehicle, 40% by weight of Kawaslip SA, 20% by weight of synchro wax ERL-C, 20% by weight of Alcon P-70, and 18% by weight of polyvinyl acetate (manufactured by Allied Chemical Co., trade name: AC401) %, And 2% by weight of a blue pigment (manufactured by Dainichi Seika Kogyo Co., Ltd., trade name: Chromofine Blue 4973) as a colorant, total of 500 g of the mixture containing
Is heated and kneaded (about 6 hours) at 130 ° C. until a homogeneous molten mixture is obtained by a stirring mill (manufactured by Kurimoto Iron Works), followed by filtration under heating and pressure to remove impurities and the like, and is allowed to cool at room temperature. Thus, a homogeneous cyan hot melt ink composition was obtained.

This hot melt ink composition was heated at 130 ° C.
, And the melt viscosity was measured in the same manner as in Example 1 using a rotational viscometer (EDL model manufactured by Tokimec). The average value measured five times was 13 mPa · s.

Since the penetration of the cyan hot melt ink composition was 13, it could be sufficiently flattened, and the adhesion to the recording medium, the abrasion and the gloss of the image were good.

This ink was put into an ink jet printer in the same manner as in Example 1, and ink was ejected from all nozzles.
It was confirmed that even after being left in a molten state for a day, the fuel was sprayed without any problem.

Further, as in Example 1, when the ink put in a test tube having a diameter of 12 mm was left at 135 ° C. while being melted, no separation was observed in the dispersion for one week. [Comparative Example 1] Alcon used in Example 1 as a vehicle
P-115 was reduced to 2% by weight, and a mixture containing 6% by weight of the yellow pigment used in Example 1 as a colorant was heated at 120 ° C. by an attritor in the same manner as in Example 1 until a homogeneous molten mixture was obtained. After kneading (5 hours), the mixture was filtered under heating and pressure to remove impurities and the like, and allowed to cool at room temperature to obtain a homogeneous yellow hot melt ink analog. This yellow hot melt ink analog was heated to 130 ° C., and the melt viscosity was measured using a rotational viscometer (EDI model manufactured by Tokimec) in the same manner as in Example 1. The average value measured five times was 60 mP · s.

Since the penetration degree of this yellow hot melt ink analog was 7, it could be sufficiently flattened, and the adhesion to the recording medium, the abrasion and the gloss of the image were good.

This ink analog was placed in an ink jet printer in the same manner as in Example 1, and the ejection of the ink analog was examined. As a result, even when a voltage higher than normal was applied, about 70% (7
(Nozzle No. 0).

Further, when the ink analogue placed in a test tube having a diameter of 12 mm and left in a molten state at 135 ° C. in the same manner as in Example 1, no separation was observed in the dispersion for one week. [Comparative Example 2] The mixture containing Slipax O used in Example 2 as a vehicle was reduced to 2% by weight, 53% by weight of Pine Crystal K-100 and 5% by weight of a black pigment used in Example 2 as a colorant. 500 g was heated and kneaded (about 3 hours) at 130 ° C. using a Clearmix in the same manner as in Example 2 until a homogeneous molten mixture was obtained, followed by filtration under heating and pressure to remove impurities and the like, and the mixture was discharged at room temperature. Upon cooling, a homogeneous cyan hot melt ink analog was obtained.

This hot melt ink analog was heated to 130 ° C.
, And the melt viscosity was measured in the same manner as in Example 1 using a rotational viscometer (EDL model manufactured by Tokimec). The average value measured five times was 180 mPa · s.

Since the penetration of the cyan hot melt ink analog was 6, it could not be sufficiently flattened.

When the ink analog was put into an ink jet printer in the same manner as in Example 1, and the ejection of the ink analog was examined, the ink analog could not be ejected from all the nozzles.

Further, when the ink analog placed in a test tube having a diameter of 12 mm and left in a molten state at 135 ° C. as in Example 1, no separation was observed in the dispersion for one week. [Comparative Example 3] 60% by weight of Kawaslip SA as a vehicle, 20% by weight of Slipax O as a polyamide, and (SYLVAMI, manufactured by Arizona Chemical Co., Ltd.)
DE-5), a total of 500 g of a mixture containing 10% by weight of Alcon M90, 8% by weight of Alcon M2 and 2% by weight of a black pigment carbon black MA77 as a colorant was homogenized at 130 ° C. by means of a stirring mill (manufactured by Kurimoto Iron Works). The mixture was heated and kneaded until a suitable molten mixture was obtained (about 6 hours), followed by filtration under heat and pressure to remove impurities and the like, and was allowed to cool at room temperature to obtain a homogeneous black hot melt ink.

This hot melt ink was heated to 130 ° C., and a rotational viscometer (EDL manufactured by Tokimec) was used in the same manner as in Example 1.
) Was used to measure the melt viscosity. The average value measured five times was 53 mPa · s.

Since the penetration of this black hot melt ink analog was 6, it could not be sufficiently flattened.

When the ink analog was put into an ink jet printer in the same manner as in Example 1, and the ejection of the ink analog was examined, no ink analog could be ejected from all the nozzles.

Further, when the ink analog placed in a test tube having a diameter of 12 mm as in Example 1 was left at 135 ° C. while being melted, no separation was observed in the dispersion for one week.

[0089]

The hot-melt ink composition for ink-jet printing of the present embodiment achieves both dispersion stability and jetting characteristics, which have conventionally been problems when a pigment is used as a colorant. It has become possible to manufacture inks that are more versatile than inks used as agents. In addition, since heating or pressurization can be easily performed, the adhesion to the recording medium is excellent and the printing quality is improved.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship between temperature and melt viscosity of various polyamides used in the present invention or comparative examples.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C056 FC02 FD02 2H086 BA55 BA59 BA60 BA61 BA62 4J039 AD18 AE08 BE01 CA07 CA09 EA15 EA16 EA17 EA20 EA44 FA01 FA02 FA03 FA04 FA05 GA24

Claims (4)

[Claims] An ink-jet hot-melt type in which a solid ink composition is liquefied at room temperature by heating and then applied with some jetting energy to jet ink droplets onto a recording medium to form recording dots. In the ink composition, the ink composition comprises: a pigment;
50% by weight, (b) 5 to 30% of alicyclic saturated hydrocarbon resin
A hot-melt ink composition for ink-jet, comprising: at least one component selected from the group consisting of a weight% and a mixture thereof. 2. The hot melt ink composition for ink-jet recording according to claim 1, wherein the polyamide has a melt viscosity at 130 ° C. of 8 to 250 mPa · s. 3. The alicyclic saturated hydrocarbon resin has a softening point of 7
The hot melt ink composition for inkjet according to claim 1, wherein the temperature is 0 to 125C. 4. The method according to claim 1, wherein the composition is heated or / and heated on a recording medium.
4. The method for recording a hot-melt ink composition for ink-jet recording according to claim 1, wherein the surface of the ink droplet is reformed flat by pressure and pressure.