JPH059422A - Hot melt ink composition - Google Patents

Abstract

(57) [Summary] [Object] It is an object of the present invention to provide a hot-melt ink composition having improved print scratch resistance of recording dots and excellent print quality. A further object of the present invention is to provide a hot melt ink composition that suppresses the sinter phenomenon and is excellent in printing quality. The present invention is a hot melt ink composition comprising a vehicle and a colorant, wherein the vehicle comprises dialkylbenzenesulfonamide, monoalkylbenzenesulfonamide and a resin. Further, the present invention is a hot melt ink composition comprising a vehicle and a coloring material, which contains 10 to 30% by weight of the coloring material.

Description

Detailed Description of the Invention

[Background of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink composition used in an ink jet recording apparatus, and more particularly to a room temperature solid hot melt ink composition for ink jet recording under a temperature higher than room temperature.

[0002]

2. Description of the Related Art Ink jet recording is excellent in quietness during recording and high-speed printability. As an ink composition for inkjet recording, a liquid ink composition based on water or the like has been used. However, since recording with a water-based ink composition is performed by bleeding into the paper, bleeding occurs on the paper where the ink easily bleeds in, the periphery of the recording dots becomes unclear, and the print quality deteriorates. Was.

As an ink composition which provides good print quality regardless of paper quality, a hot melt ink composition based on a wax which is solid at room temperature has been proposed (US Pat. Nos. 4,390,369 and No. 4390369). No. 4,484,948, No. 4,659,383, and JP-A-58-1082.
No. 71). These ink compositions are solid at room temperature, and recording is performed by ejecting ink droplets after heating and melting, and cooling and solidifying on the recording paper to form recording dots. Such an inkjet recording method is called a hot melt inkjet recording method.

However, the above-mentioned hot melt ink composition is inferior to the conventional water-based ink composition in terms of storability and handling of documents. This is because the recording dots formed on the recording paper are easily worn and deformed due to external friction and pressure, and have poor print rub resistance.

In order to solve this problem, a solid organic solvent mainly composed of monoalkylbenzenesulfonamide,
A hot melt ink composition comprising a thermosetting resin having a hydroxy value (hydroxyl acid value) of 50 or more and an acid value of 10 or less has been proposed (US Pat. No. 4,820,346, JP-A-62-48774). ).

Although the printing rub resistance of this ink composition is improved as compared with that of a hot melt ink composition mainly composed of natural wax, electrophotographic recording dots which are becoming the mainstream as a printing apparatus at present. It can be said that it is still insufficient when compared with the abrasion resistance of the print. While the characteristics required for printed matter such as official documents are becoming strict, it can be said that the improvement of the abrasion resistance of printing is a major issue.

The hot-melt ink composition is filled in a recording apparatus, melted each time the recording apparatus is used, and solidified after use, which is repeated. At that time, the ink composition is prone to thermal deterioration due to polymerization reaction, thermal alteration, and the like. As a result, the life of the ink is shortened, and the ink in which the nozzles of the head are denatured and solidified may be blocked.

Further, in the hot-melt ink composition mainly composed of monoalkylbenzenesulfonamide (particularly in the case of containing orthotoluenesulfonamide), the phenomenon that the recording dot surface blows out white powder due to the change with time (hereinafter referred to as “white flower”). Sometimes referred to as a "phenomenon"). This hinders the appearance of printing.

[Outline of the Invention]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a hot melt ink composition having improved print rub resistance of recording dots and excellent print quality. Another object of the present invention is to provide a hot melt ink composition having improved heat resistance. A further object of the present invention is to provide a hot melt ink composition that suppresses the sinter phenomenon and is excellent in printing quality.

[0010]

The present invention is a hot melt ink composition comprising a vehicle and a colorant, wherein the vehicle comprises a dialkylbenzenesulfonamide, a monoalkylbenzenesulfonamide, and a resin. It is a melt ink composition. Further, the present invention is
A hot melt ink composition comprising a vehicle and a color material, the hot melt ink composition comprising 10 to 30% by weight of the color material. According to the present invention, it was unexpected that the addition of both the monoalkylbenzenesulfonamide and the dialkylbenzenesulfonamide to the hot melt ink composition would greatly improve the abrasion resistance of the print. Further, in a hot melt ink composition containing alkylbenzenesulfonamide as a main component, it was unexpected that the whitening phenomenon could be prevented by adding a predetermined amount of a coloring material.

[Detailed Description of the Invention] The vehicle constituting the hot melt ink composition according to the present invention comprises (i) a dialkylbenzenesulfonamide, (ii) a monoalkylbenzenesulfonamide, and (iii) a resin. It will be.

The alkyl group moiety of the dialkylbenzenesulfonamide, which is a constituent of the present invention, may be linear or branched and is preferably a C _1-5 alkyl group, more preferably a C _1-2 alkyl group. It is a base. Also,
The substitution position is not particularly limited, but 2,4-, 2,5
The -or 3,4-substituted form is preferred. The two alkyl groups may be the same or different, but are preferably the same. Further, it is possible to add a plurality of dialkylbenzenesulfonamide by mixing.

The addition of the dialkylbenzenesulfonamide greatly improves the mechanical strength of the ink composition itself, which affects the abrasion resistance of the print. Although the mechanism of action for improving the mechanical strength is not clear, the coexistence of dialkylbenzenesulfonamide and monoalkylbenzenesulfonamide causes hydrogen bonding, intermolecular force (van der Waals force), and It is presumed that this is due to interaction such as entanglement of the three-dimensional structure of the molecule. This can be inferred from the fact that the hot melt ink composition containing the dialkylbenzenesulfonamide without using the monoalkylbenzenesulfonamide did not show an effective improvement in mechanical strength.

When the number of carbon atoms in the alkyl group of the dialkylbenzenesulfonamide exceeds 5, the increase in the number of carbon atoms causes steric hindrance and reduces effective hydrogen bonding and intermolecular force when the molecules are close to each other. Therefore, it is not preferable. Alkylbenzenesulfonamide in which 3 or more alkyl groups are substituted is also not preferable because steric hindrance increases the intermolecular distance.

The amount of dialkylbenzenesulfonamide added is preferably about 5 to 40% by weight in the vehicle. If the addition amount is less than 5% by weight, or if the addition amount exceeds 40% by weight, it is not possible to obtain sufficient intermolecular interaction that brings about the improvement in the mechanical strength of the ink composition, which is preferable. Absent.

Examples of preferable dialkylbenzenesulfonamide include 3,4-dimethylbenzenesulfonamide (3,4-dimethyl-BSA), 2,4-dimethylbenzenesulfonamide (2,4-dimethyl-BSA) and 2 , 5-Dimethylbenzenesulfonamide (2,5-diethyl-BSA), 2,
4-diethylbenzenesulfonamide (2,4-dimethyl-B
SA), 2,4-dibutylbenzenesulfonamide (2,4-
dibutyl-BSA), 3,4-dipentylbenzenesulfonamide (3,4-dipentyl-BSA), 3,4-dihexylbenzenesulfonamide (3,4-dihexyl-BSA) and the like.

The alkyl group moiety of the monoalkylbenzenesulfonamide, which is a constituent of the present invention, may be linear or branched and is preferably a C _1-4 alkyl group, more preferably a C _1-2 alkyl group. It is a base. The substitution position is not particularly limited, but the alkyl group is preferably in the para position with respect to the sulfonamide group.
Further, it is also possible to add a plurality of monoalkylbenzenesulfonamide as a mixture.

The amount of the monoalkylbenzenesulfonamide added is preferably 50 to 8 in the vehicle.
It is about 5% by weight. Examples of preferable monoalkylbenzenesulfonamide include 4-methylbenzenesulfonamide (p-toluenesulfonamide: p-TSA), 4-
Ethylbenzenesulfonamide (p-ethylbenzenesulfonamide: p-EBSA), 4-propylbenzenesulfonamide (p-propylbenzenesulfonamide: p-PBS)
A), 4-n-butylbenzenesulfonamide (p-butylbenzenesulfonamide: pn-BBSA) and the like.

The monoalkylbenzenesulfonamide in the vehicle may be added as a mixture of monoalkylbenzenesulfonamide. Thereby, various properties of the ink composition can be improved. For example, when a mixture of 4-methylbenzenesulfonamide and 4-ethylbenzenesulfonamide is used as the monoalkylbenzenesulfonamide, the mechanical strength of the ink composition is improved as compared with the case where the same amount of 4-methylbenzenesulfonamide is used. Can be made. In this case, the amount of 4-ethylbenzenesulfonamide added is 20 to 60.
About wt% is preferable.

Further, the hot melt ink composition according to the present invention may further contain 4-n-C _3-9 alkylbenzenesulfonamide. This can improve the mechanical strength of the ink composition.

The resin which is a constituent of the present invention may be any resin which is compatible with the above-mentioned dialkylbenzenesulfonamide and monoalkylbenzenesulfonamide, but those having a melting point or a softening point of 50 ° C. or higher are recorded after printing. It has good storability and is preferable.

According to another aspect of the present invention, a resin having a hydroxyl value of 50 or less is preferable from the viewpoint of mechanical strength of the ink composition. A resin having a hydroxyl value of 50 or less and an acid value of 10 or more is more preferable. Further, according to another aspect, a resin having an acid value of 10 or more is also preferable from the viewpoint of mechanical strength of the ink composition. A resin having an acid value of 10 or more and a hydroxyl value of 100 or more is more preferable. In the present invention, the mechanism of action for improving the mechanical strength of the ink composition is not clear when the acid value and / or the hydroxyl value of the resin is in the above range. It is speculated that the efficiency of hydrogen bonding between the sulfonamide and the terminal carboxyl group or the terminal hydroxyl group is improved, which contributes to the improvement of the mechanical strength of the ink composition. It should be noted that addition of a resin having the above-mentioned characteristic value to a hot-melt ink composition containing no dialkylbenzenesulfonamide and containing monoalkylbenzenesulfonamide as a main component did not improve the mechanical strength of the ink composition. It was

The above-mentioned acid value and hydroxyl value are characteristic values of the resin. The acid value represents the amount of terminal carboxyl groups contained in a fixed amount of resin, and the hydroxyl value represents the amount of terminal hydroxyl groups contained in a fixed amount of resin. The hydroxyl value and acid value in the examples described below are JIS (Japanese Industr
ial Standard) K1557-1970 and K007
It is measured using a method according to 0-1966.

According to another aspect of the present invention, the weight average molecular weight is 10,000 or more and the number average molecular weight is 3,
It is preferable to use a resin of 600 or more. When a resin having such a molecular weight is used, an ink composition that is extremely resistant to thermal deterioration can be obtained. The heat deterioration of the hot melt ink composition causes the resin to be exposed to high temperature, resulting in a decrease in melting point due to breaking of polymer chains, discoloration due to an oxidation reaction, and a change in molecular weight and molecular structure due to a crosslinking reaction (polymerization). It is thought to be a complex intertwined phenomenon. This phenomenon is observed as a shift of the initial molecular weight to a lower molecular weight side and a rapid increase in the molecular weight thereafter, in view of the change in the molecular weight of the polymer compound. The amount of resin added is preferably about 5 to 15% by weight. It is generally considered that a large resin component is preferable for improving the print scratch resistance, but when the amount is large, the viscosity of the ink composition increases. Therefore, the amount of resin added within the above range is preferable.

Examples of preferred resins include polyester resins, polystyrene resins, polyester polyol resins, alkyd resins, acrylic resins and the like.
The coloring material that is a constituent element of the present invention is not particularly limited as long as it is soluble in the above-mentioned vehicle, but one having heat resistance is preferable. Preferred examples of the coloring material include the following. C. I. Solvent Yellow 2,14,19,33,4
2, 48, 61, 79, 83, 93, 114, 130 C.I. I. Solvent Red 3,8,24,49,52,
84, 91, 92, 100, 109, 111, 127,
135,179 C.I. I. Solvent Blue 2,11,25,35,4
4,45,55,97C. I. Solvent black 3,
5,7,22,23,45 If the addition amount of these coloring materials is 5% by weight or less and about 2% by weight in the ink composition, it is sufficient for coloring.

However, it has been surprisingly found that the white flower phenomenon can be remarkably suppressed when the amount of the coloring material added is 10 to 30% by weight. The white bloom phenomenon is a state in which white powder is blown out due to the generation of minute precipitated crystals on the surface of the printed matter, and this phenomenon is considered to be caused by the change with time of the ink. In addition to the change over time, it is estimated that oil and fat contained in humidity and sweat adhere as fingerprints to further promote the white flower phenomenon. Such a white flower phenomenon is caused by adding the coloring material in an amount of 10 to 10.
By setting it to 30% by weight, it was possible to suppress it unexpectedly. Even if the amount of the coloring material added exceeds 30% by weight, the effect of suppressing the white bleaching phenomenon can be obtained, but this is not preferable because the viscosity of the ink increases significantly. It should be noted that the suppression of the white flower phenomenon is obtained regardless of whether or not the dialkylbenzenesulfonamide is added.

The hot melt ink composition according to the present invention is printed at a temperature higher than room temperature. Therefore, in order to prevent the composition from being oxidized by heat or the like, it is preferable to appropriately add an antioxidant. Examples of antioxidants include hindered phenol-based, arylamine-based, phosphite-based, and thioester-based antioxidants. Further, the hot melt ink composition according to the present invention may be added with various surfactants as a surface tension adjusting agent and an additive such as an ultraviolet absorber for preventing discoloration due to sunlight.

The ink composition according to the present invention can be prepared by a known method. That is, first, a vehicle, a colorant, and various kinds of additives are mixed, and the mixture is heated to a temperature equal to or higher than the melting point of the vehicle component and melted. A hot melt ink composition can be obtained by stirring the melted mixture to form a uniform dissolved composition, filtering it with a filter as necessary, and then cooling.

The hot melt ink composition according to the present invention obtained as described above has a shear strength of 0.2 kg / mm ² or more. When the shear strength of the hot melt ink composition is the above or more, the abrasion resistance of the printed matter is improved. In general,
It was thought that a large value for both the shear strength and the spread rate was preferable from the viewpoint of print scratch resistance, but according to the experiments of the present inventors, when the shear strength is less than the above value, It was revealed that the print scratch resistance was not improved even if the value of the spread rate was increased. Table 1 shows preferable ranges of the shear strength and the spread rate.

[0030]

According to still another embodiment of the present invention, the hot melt ink composition according to the present invention has the following formula (a) in addition to the above-mentioned dialkylbenzenesulfonamide, monoalkylbenzenesulfonamide and coloring material. It may further include the represented benzenesulfonamide.

[0032]

[Chemical 2] (In the formula, R ¹ and R ² are independently a hydrogen atom, C
_{It represents a 1-6} alkyl group, a 5- or 6-membered cycloalkyl group or a phenyl group, provided that R ¹ and R ² do not simultaneously represent hydrogen atoms. R ³ represents a C _1-4 alkyl group. )

The benzenesulfonamide represented by the formula (a) is contained in the vehicle in an amount of up to 5% by weight, preferably 1 to 3%.
% By weight can be added. The addition of this compound imparts flexibility to the ink composition. Addition of more than 5% by weight unfavorably softens the ink composition, significantly lowers strength and spread. As a result of the addition of benzenesulfonamide represented by the formula (a), an ink composition having a shear strength of 0.2 kg / mm ² or more and a spreading rate of 50% or more can be realized. Table 2 shows the relationship between the added amount of the compound of the formula (a) and the shear strength and the spread rate.

Table 2 Addition amount of compound (a) Shear strength (τ) Spread rate (ε) (% by weight) (kg / mm ² ) (%) 0 τ <0.2 ε ≦ 50 1-3 0. 3 ≦ τ 60 ≦ ε 4 to 5 0.2 ≦ τ <0.3 50 <ε 6 or more τ <0.2 ε ≦ 25

Preferred examples of the compound represented by the formula (a) include N-ethyl-2-methylbenzenesulfonamide, N-ethyl-4-methylbenzenesulfonamide,
N-cyclohexyl-4-methylbenzenesulfonamide (N-cyclohexyl-p-TSA), N-n-butyl-4-methylbenzenesulfonamide (Nn-butyl-p-TSA), N-
Phenyl-4-methylbenzenesulfonamide (N-phen
yl-p-TSA), N-methyl-4-methylbenzenesulfonamide (N-methyl-p-TSA), N-isopropyl-4-methylbenzenesulfonamide (N-isopropyl-p-TSA), Nn -Butyl-ethylbenzenesulfonamide (Nn-
butyl-p-EBSA) Nt-butyl-2-methylbenzenesulfonamide (Nt-butyl-o-TSA) N, N-diethyl-2-methylbenzenesulfonamide (N, N-diethyl-o-TSA) , N, N-diethyl-4-methylbenzenesulfonamide (N, N-diethyl-p-TSA), and the like.

The hot melt ink composition according to the present invention has preferable conditions required for other hot melt ink compositions. For example, from the viewpoint of the stability of ink supply, droplet formation, and flight under high-speed response of the head, the temperature during printing operation (100 to 150 ° C.)
The viscosity of the ink composition is preferably 20.0 mPa · s or less. Further, 5.0 to 15.0 mPa · s is preferable for realizing high-speed response. Further, the surface tension of the ink composition during the printing operation is preferably 50 mN / m or less from the viewpoint of meniscus formation in the vicinity of the nozzle. Further, in order to promote the permeation of the ink on the recording paper after printing, it is more preferably 35 mN / m or less. The hot melt ink composition according to the present invention satisfies the preferable conditions described above.

[0037]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. Preparation of Hot Melt Ink Composition According to a known method, hot melt ink compositions having the compositions shown in Table 4 were prepared as Examples A1 to 37. That is, the alkylbenzenesulfonamide, resin and coloring material shown in the table were heated to a temperature above their melting point, preferably about 5 to 15 ° C. higher than the melting point, sufficiently stirred and then filtered with a filter. Then, it cooled and the hot-melt ink composition was obtained. Similarly, the hot melt ink compositions shown in Table 5 were prepared as Comparative Examples A1-24. The resins used in Examples and Comparative Examples were Finedic M (Finedic M, a polyester resin manufactured by Dainippon Ink and Chemicals, Inc.) and Finedic A (Fine
dic A, made by Dainippon Ink and Chemicals, polyester resin, acrylic resin, polyester resin X (Toray Industries, Inc.), Desmophene (Sumitomo Bayer Urethane Co., Ltd., polyester resin), Nippollan
, Polyurethane Polyol resin manufactured by Nippon Polyurethane Industry Co., Ltd., and RJ-100 (styrene-allyl alcohol copolymer manufactured by Monsanto Co., Ltd.), and their hydroxyl value, acid value and molecular weight are shown in Table 3 below. As described.

Table 3 Resin Hydroxide Value Acid Value Weight Average Molecular Weight Number Average Molecular Weight (KOH mg / g) (KOH mg / g) Finedic M-8075 43-14,000 4,000 Finedic M-8020 30-17, 000 4,000 Finedic A-239X 22 14 10,000 4,000 Finedic A-239Y 15 23 12,000 4,500 Finedic A-239W 10 14 18,000 5,500 Finedic M-8630 -26 26 18,000 5 , 000 Finedic M-8500-54 18,000 3,700 Polyester resin X 390 26-Desmophene 650 212 212 ≤ 4 3,500 1,140 Desmophene 651 212 ≤ 48, 470 1, 530 Nipporan 2200 621 1-RJ -100 187-2,340 1,600 Finedic A-239W 53-10,000 3,500

Evaluation Test (1) Shear Strength Test The ink composition obtained as described above was molded into a cylindrical pellet shape (FIG. 1 (a)) having a diameter of 4 mm and a length of 4 mm,
This was subjected to a shear test using a compression tester as shown in FIG. 1 (b). First, the pellet was fixed to the support 22.
Next, a shearing force was applied in the F direction at a speed of 10 mm / min by the crosshead 21, and the pressure was detected by the load cell 23. The detected pressure was recorded on a chart, and the peak value when the ink composition broke was defined as the shear strength. The shear strengths of the pellets of Examples and Comparative Examples are as shown in Tables 4 and 5.

(2) Measurement of spread rate The spread rate was measured at the same time when the shear strength test was performed.
When shearing force is applied to the pellet, resulting in fracture,
The area in which the crosshead 21 was embedded was measured. The ratio (%) of the measured area to the cross-sectional area of the pellet was taken as the spread rate.

(3) Measurement of Viscosity The viscosity of some hot melt ink compositions of Examples and Comparative Examples at 120 ° C. was measured. The results were evaluated as follows. The results are as shown in Tables 4 and 5. 20 mPa · s or less (suitable for printing)
◎ More than 20 mPa · s (printing failure, printing is not possible) ...
×

(4) Evaluation of Printing Rubbing Resistance The hot melt ink compositions of Examples and Comparative Examples were printed on various materials to be transferred using an on-demand type (impulse type) ink jet recording apparatus. The print surface was rubbed with a clip, and the presence or absence of print stain was evaluated as follows. The load applied to the clip was 200 kg / mm ² . The evaluation results are as shown in Tables 4 and 5. No dirt even after rubbing for 40 strokes or more .... ◎ Staining occurs with friction of 30 to 40 strokes.

(5) Evaluation of white flower phenomenon The printed matter printed in the same manner as in the above (4) was left at room temperature,
The surface of the printed matter was observed at regular intervals. The results were evaluated as follows. The evaluation results are as shown in Tables 4 and 5. After left for 3 months or more, no white fluff is visually observed ... ◎ White fluff is visually observed within 3 months
… ×

(6) Heat resistance evaluation test (1) The ink compositions of Examples and Comparative Examples were left in an environment of 150 ° C. to obtain mechanical strength, hue and physical characteristics (viscosity,
Changes in surface tension and melting point) were measured over time. And
The time until the initial physical properties were lost was defined as the life and evaluated as follows. The evaluation results are as shown in Tables 4 and 5. Life time 100 hours or more ◎ Life time 10 hours or more less than 100 hours… ○ Life time less than 10 hours… ×

(7) Heat resistance evaluation test (2) 150 several ink compositions of Examples and Comparative Examples
The sample was allowed to stand in an environment of ° C, and the time until the deterioration that would affect the inkjet recording was measured was measured and evaluated as follows. The evaluation results are as shown in Tables 4 and 5. 500 hours or more ... ◎ 250 hours or more and less than 500 hours ... ○ Less than 250 hours ... ×

[0046]

[Table 1]

[0047]

[Table 2]

[0048]

[Table 3]

[0049]

[Table 4]

[0050]

[Table 5]

[0051]

[Table 6]

[0052]

[Table 7]

[0053]

[Table 8]

Evaluation test for suppression of white flower phenomenon Hot melt ink compositions having the compositions shown in Tables 6 and 7 were prepared in the same manner as in Examples A1 to A34. The obtained ink composition was printed and recorded in the same manner as in the case of (4) Evaluation of print scratch resistance. Leave the printed matter at room temperature,
It was left in an environment of 40 ° C.-90% relative humidity, a fingerprint was attached thereto, and then left at room temperature, and appearance of white sinter was evaluated as follows. The evaluation results are as shown in Tables 6 and 7. Leave at room temperature No white flower phenomenon for more than 6 months… ◎
◎ No sinter phenomenon for 3 months or more ... ◎ 40 ° C-90% relative humidity No sinter phenomenon for one month or more ... ◎ Sinter phenomenon for one month or more… × Fingerprint for three months or more No phenomenon occurred… ◎ White flower phenomenon occurred within 3 months… ×

[0055]

[Table 9]

[0056]

[Table 10]

[0057]

[Table 11]

[Brief description of drawings]

FIG. 1 (a) is a schematic view of a pellet-like ink composition used for evaluating shear strength and spread rate, and FIG. 1 (b) is a schematic view of shear strength and spread rate. It is a figure which shows the compression testing machine used for.

[Explanation of symbols]

1 Hot melt ink composition 21 crosshead 22 Support 23 load cell

   ─────────────────────────────────────────────────── ─── Continued front page    (31) Priority claim number Japanese Patent Application No. 2-246525 (32) Priority Day Hei 2 (1990) September 17 (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 2-246526 (32) Priority Day Hei 2 (1990) September 17 (33) Priority claiming country Japan (JP) (72) Inventor Fumie Uehara             Seiko, 3-3-3 Yamato, Suwa City, Nagano Prefecture             -In Epson Corporation (72) Inventor Ikuko Kawakami             Seiko, 3-3-3 Yamato, Suwa City, Nagano Prefecture             -In Epson Corporation

Claims (19)

[Claims] 1. A hot melt ink composition comprising a vehicle and a colorant, wherein the vehicle comprises a dialkylbenzenesulfonamide, a monoalkylbenzenesulfonamide and a resin. 2. The hot melt ink composition according to claim 1, wherein the dialkylbenzenesulfonamide in the vehicle is 5 to 40% by weight. 3. A dialkylbenzenesulfonamide is diC
The hot melt ink composition according to claim 1, which is a _1-5 alkylbenzenesulfonamide. 4. The dialkylbenzenesulfonamide is 2,
The hot melt ink composition according to claim 1, which is a 4-, 2,5- or 3,4-dialkylbenzenesulfonamide. 5. The hot melt ink composition according to claim 1, wherein the monoalkylbenzenesulfonamide in the vehicle is 50 to 85% by weight. 6. A monoalkylbenzenesulfonamide,
4-methylbenzenesulfonamide and / or 4-
The hot melt ink composition according to claim 1, which is ethylbenzenesulfonamide. 7. The hot melt ink composition according to claim 6, wherein the 4-ethylbenzenesulfonamide in the vehicle is 20 to 60% by weight. 8. The hot melt ink composition according to claim 1, further comprising 4-n-C _3-9 alkylbenzenesulfonamide. 9. The hot melt ink composition according to claim 1, wherein the amount of the resin in the vehicle is 5 to 15% by weight. 10. The hot melt ink composition according to claim 1, wherein the hydroxyl value of the resin is 50 or less. 11. The resin having an acid value of 10 or more.
No. 0 hot melt ink composition. 12. The resin having an acid value of 10 or more.
The hot melt ink composition described. 13. The hot melt ink composition according to claim 12, wherein the hydroxyl value of the resin is 100 or more. 14. The hot melt ink composition according to claim 1, wherein the resin has a weight average molecular weight of 10,000 or more and a number average molecular weight of 3,600 or more. 15. The hot melt ink composition according to claim 1, wherein the shear strength of the ink is 0.2 kg / mm ² or more. 16. The hot melt ink composition according to claim 1, further comprising a compound represented by the following formula (a). [Chemical 1] (In the formula, R ¹ and R ² are independently a hydrogen atom, C
_{It represents a 1-6} alkyl group, a 5- or 6-membered cycloalkyl group or a phenyl group, provided that R ¹ and R ² do not simultaneously represent hydrogen atoms. R ³ represents a C _1-4 alkyl group. ) 17. The hot melt ink composition according to claim 16, wherein the amount of the compound represented by the formula (a) in the vehicle is 5% by weight or less. 18. A hot melt ink composition comprising a vehicle and a color material, the hot melt ink composition comprising 10 to 30% by weight of the color material. 19. The hot melt ink composition according to claim 18, wherein the vehicle comprises dialkylbenzenesulfonamide and / or monoalkylbenzenesulfonamide and a resin.