JP3039031B2 - Hot melt ink composition - Google Patents

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 solid-state hot-melt ink composition for ink-jet recording at a temperature higher than room temperature.

[0002]

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

As an ink composition that provides good print quality irrespective of paper quality, a hot melt ink composition based on a wax or the like that is solid at normal temperature has been proposed (US Pat. Nos. 4,390,369 and 4,390,369). Nos. 4,484,948 and 4,659,383, JP-A-58-1082.
No. 71 publication). These ink compositions are solid at normal temperature, and the recording is performed by heating and fusing the ink droplets and then cooling and solidifying them on recording paper to form recording dots. Such an ink jet recording method is called a hot melt ink jet recording method.

However, the above-mentioned hot melt ink composition is inferior to the conventional water-based ink composition in storage stability and handling of documents. This is because the recording dots formed on the recording paper are easily abraded or deformed by external friction, pressure, or the like, resulting in poor print abrasion resistance.

[0005] 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 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). ).

[0006] The print rub resistance of this ink composition has been improved compared to that of a hot melt ink composition mainly composed of natural wax, but the recording dot of the electrophotographic system which is becoming mainstream as a printing apparatus at present. It can be said that it is still insufficient compared with the print rub resistance of No. As the characteristics required for printed matter such as official documents become strict, improvement of the print abrasion resistance is a major issue.

[0007] Further, a cycle of filling the hot melt ink composition into the recording apparatus, melting it each time the recording apparatus is used, and solidifying after use is repeated. At that time, the ink composition is liable to undergo thermal degradation due to polymerization reaction, thermal deterioration, and the like. As a result, the ink life is shortened, and the nozzles of the head are blocked by the altered and solidified ink.

Further, in a hot-melt ink composition mainly containing a monoalkylbenzenesulfonamide (especially when orthotoluenesulfonamide is contained), a phenomenon in which the surface of a recording dot becomes white and powder is blown out with the lapse of time (hereinafter referred to as "Hakuka") Phenomenon "). This hinders the appearance of printing.

[Summary of the Invention]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a hot-melt ink composition which is excellent in printing quality and has improved printing abrasion resistance of recording dots. Another object of the present invention is to provide a hot melt ink composition having improved heat resistance. Another object of the present invention is to provide a hot melt ink composition which suppresses the whitening phenomenon and has excellent print quality.

[0010]

SUMMARY OF THE INVENTION 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. Furthermore, the present invention
A hot-melt ink composition comprising a vehicle and a coloring material, wherein the hot-melting ink composition comprises 10 to 30% by weight of the coloring material. According to the present invention, it was unexpectedly found that by adding both a monoalkylbenzenesulfonamide and a dialkylbenzenesulfonamide to the hot melt ink composition, the print abrasion resistance was greatly improved. Furthermore, it was unexpectedly possible to prevent a white spot phenomenon by adding a predetermined amount of a coloring material to a hot melt ink composition containing alkylbenzene sulfonamide as a main component.

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 becomes.

The alkyl group portion of the dialkylbenzenesulfonamide which is a component of the present invention may be linear or branched, preferably a C _1-5 alkyl group, more preferably a C _1-2 alkyl group. Group. Also,
Although the substitution position is not particularly limited, 2,4-, 2,5
-Or 3,4-substituted is preferred. The two alkyl groups may be the same or different, but are preferably the same. Further, a plurality of dialkylbenzenesulfonamides can be mixed and added.

The addition of dialkylbenzenesulfonamide greatly improves the mechanical strength of the ink composition itself, which affects print abrasion resistance. Although the mechanism of action for improving mechanical strength is not clear, the coexistence of dialkylbenzenesulfonamide and monoalkylbenzenesulfonamide causes hydrogen bonding between both molecules, intermolecular force (van der Waals force), It is presumed that this is caused by the occurrence of interactions such as entanglement of the three-dimensional structure of the molecules. This can be inferred from the fact that no effective improvement in mechanical strength was observed in a hot melt ink composition containing dialkylbenzenesulfonamide without using monoalkylbenzenesulfonamide.

When the number of carbon atoms in the alkyl group of the dialkylbenzenesulfonamide exceeds 5, an increase in the number of carbon atoms causes steric hindrance, and reduces effective hydrogen bonding and intermolecular force when the molecules are approaching. Therefore, it can be said that it is not preferable. Alkylbenzenesulfonamides having three or more alkyl groups are also not preferred because steric hindrance increases the intermolecular distance.

The amount of the dialkylbenzenesulfonamide to be 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 preferable because sufficient intermolecular interaction for improving the mechanical strength of the above ink composition cannot be obtained. .

Examples of preferred dialkylbenzenesulfonamides include 3,4-dimethylbenzenesulfonamide (3,4-dimethyl-BSA), 2,4-dimethylbenzenesulfonamide (2,4-dimethyl-BSA), , 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 portion of the monoalkylbenzenesulfonamide which is a component of the present invention may be either linear or branched, preferably a C _1-4 alkyl group, more preferably a C _1-2 alkyl group. Group. The substitution position is not particularly limited, but it is preferable that the alkyl group is in a para-position to the sulfonamide group.
Furthermore, it is also possible to mix and add a plurality of monoalkylbenzenesulfonamides.

The amount of the monoalkylbenzenesulfonamide added is preferably 50 to 8 in the vehicle.
It is about 5% by weight. Examples of preferred monoalkylbenzenesulfonamides include 4-methylbenzenesulfonamide (p-toluenesulfonamide: p-TSA),
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 a plurality of monoalkylbenzenesulfonamides. Thereby, various characteristics 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 done. In this case, the addition amount of 4-ethylbenzenesulfonamide is 20 to 60.
% By weight is preferred.

Further, the hot melt ink composition according to the present invention may further comprise a 4-nC _3-9 alkylbenzenesulfonamide. Thereby, the mechanical strength of the ink composition can be improved.

The resin which is a constituent element of the present invention may be any resin which is compatible with the above-mentioned dialkylbenzenesulfonamide and monoalkylbenzenesulfonamide. Good preservability and preferable.

According to another aspect of the present invention, a resin having a hydroxyl value of 50 or less is preferred from the viewpoint of the 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 embodiment, a resin having an acid value of 10 or more is similarly preferable from the viewpoint of the mechanical strength of the ink composition. Resins having an acid value of 10 or more and a hydroxyl value of 100 or more are more preferable. In the present invention, when the acid value and / or the hydroxyl value of the resin is in the above-mentioned range, the mechanism of action for improving the mechanical strength of the ink composition is not clear. It is presumed that the efficiency of hydrogen bonding between the sulfonamide and the terminal carboxyl group or terminal hydroxyl group is improved, which contributes to the improvement of the mechanical strength of the ink composition. Incidentally, even if the resin having the above characteristic value is added to a hot melt ink composition containing no dialkylbenzenesulfonamide and containing a monoalkylbenzenesulfonamide as a main component, no improvement in the mechanical strength of the ink composition is observed. 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 certain amount of resin, and the hydroxyl value represents the amount of terminal hydroxyl groups contained in a certain amount of resin. The hydroxyl value and the acid value in Examples described later are based on JIS (Japanese Industr
ial Standard) K1557-1970 and K007
It was measured using a method according to 0-1966.

According to still another embodiment 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 thermal degradation of the hot melt ink composition is a result of the resin being exposed to high temperatures, resulting in a decrease in melting point due to polymer chain breakage, discoloration due to oxidation reaction, and changes in molecular weight and molecular structure due to crosslinking reaction (polymerization). It is considered to be a complicated entangled phenomenon. This phenomenon is observed as an initial shift of the molecular weight to a lower molecular weight side and a rapid increase in the molecular weight thereafter, as viewed from the change in the molecular weight of the polymer compound. The amount of the 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 abrasion resistance. However, if the amount is large, the viscosity of the ink composition increases. Therefore, the resin addition amount in the above range is preferable.

Preferred examples of the resin include polyester resin, polystyrene resin, polyester polyol resin, alkyd resin and acrylic resin.
The coloring material, which is a component of the present invention, is not particularly limited as long as it is soluble in the above-described vehicle, but a coloring material 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, 97 C.I. I. Solvent Black 3,
5,7,22,23,45 If the amount of these coloring materials is 5% by weight or less and about 2% by weight in the ink composition, it is sufficient for color development.

However, surprisingly, it has been found that when the amount of the coloring material added is 10 to 30% by weight, the whitening phenomenon can be remarkably suppressed. The efflorescence phenomenon refers to a state in which fine precipitate crystals are generated on the surface of a printed matter and a white powder is blown out. This phenomenon is considered to be caused by a change with time of the ink. In addition to the change over time, it is estimated that the attachment of oils and fats contained in humidity, sweat, and the like as fingerprints further promotes the efflorescence phenomenon. Such a efflorescence phenomenon can be achieved by increasing the amount of the coloring material to 10 to 10%.
By setting it to 30% by weight, it was possible to suppress unexpectedly. When the amount of the coloring material exceeds 30% by weight, the effect of suppressing the whitening phenomenon can be obtained, but the viscosity of the ink is significantly increased, which is not preferable. It should be noted that suppression of the efflorescence phenomenon can be obtained irrespective of whether 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 the antioxidant include hindered phenol-based, arylamine-based, phosphite-based, and thioester-based antioxidants. Further, to the hot melt ink composition according to the present invention, additives such as various surfactants as a surface tension adjuster and an ultraviolet absorber for preventing fading due to sunlight or the like may be added.

The ink composition according to the present invention can be prepared by a known method. That is, first, a vehicle, a coloring agent, and various additives are appropriately mixed, and the mixture is heated to a temperature equal to or higher than the melting point of the vehicle component to be melted. The molten mixture is stirred to form a uniform dissolved composition, and then, if necessary, filtered with a filter, and then cooled to obtain a hot melt ink composition.

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 equal to or higher than the above, the scratch resistance of the printed matter is improved. In general,
It was thought that both the shear strength and the expansion ratio were preferably large values from the viewpoint of print abrasion resistance, but according to the experiments of the present inventors, when the shear strength was lower than the above value. It was clarified that the print abrasion resistance was not improved even when the value of the spread rate was increased. Table 1 shows preferred ranges of the shear strength and the elongation.

[0030]

According to still another aspect of the present invention, the hot melt ink composition according to the present invention further comprises, in addition to the above-described dialkylbenzenesulfonamide, monoalkylbenzenesulfonamide, and coloring material, a compound represented by the following formula (a): The benzenesulfonamide represented may further be included.

[0032]

Embedded image (Wherein R ¹ and R ² are independently a hydrogen atom, C
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 a hydrogen atom. R ³ represents a C _1-4 alkyl group. )

The benzenesulfonamide represented by the formula (a) is contained in the vehicle up to 5% by weight, preferably 1 to 3% by weight.
% By weight can be added. Addition of this compound imparts flexibility to the ink composition. Addition of more than 5% by weight undesirably causes the ink composition to soften, resulting in remarkable reduction in strength and spread. As a result of adding the benzenesulfonamide represented by the formula (a), an ink composition having a shear strength of 0.2 kg / mm ² or more and an elongation 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 elongation.

Table 2 Addition amount of compound (a) Shear strength (τ) Spreading rate (ε) (% by weight) (kg / mm ² ) (%) 0 τ <0.2 ε ≦ 50 1-3 3 ≦ τ 60 ≦ ε 4-5 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), Nn-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.

Further, 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 desirably 20.0 mPa · s or less. Further, for realizing high-speed response, 5.0 to 15.0 mPa · s is preferable. The surface tension of the ink composition during the printing operation is preferably 50 mN / m or less from the viewpoint of forming a meniscus near the nozzle. Further, in order to promote the penetration 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]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is 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 A37. That is, the alkylbenzenesulfonamides, resins, and coloring materials shown in the table were heated to a temperature higher than their melting points, preferably about 5 to 15 ° C. higher than the melting points, sufficiently stirred, and filtered with a filter. Thereafter, the mixture was cooled to obtain a hot melt ink composition. Similarly, hot melt ink compositions described in Table 5 were prepared as Comparative Examples A1 to A24. The resins used in Examples and Comparative Examples were Finedic M (Finedic M, a polyester resin manufactured by Dainippon Ink and Chemicals, Inc.) and Finedick A (Fine Dick A).
dic A, Dainippon Ink and Chemicals, polyester resin, acrylic resin, polyester resin X (Toray Industries, Inc.), desmophene (Desmophene, Sumitomo Bayer Urethane Co., polyester resin), Nippolan
, Nippon Polyurethane Industry Co., Ltd., polyester polyol resin) and RJ-100 (Monsanto Co., Ltd., styrene-allyl alcohol copolymer), and their hydroxyl value, acid value and molecular weight are shown in Table 3 below. It is as described.

Table 3 Resin Hydroxyl 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 18,000 5 3,000 Finedic M-8500 -54 18,000 3,700 Polyester resin X 390 26--Desmophene 650 212 ≤ 4 3,500 1,140 Desmophene 651 212 ≤ 48,470 1,530 Nipporan 2200 62 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 formed into a cylindrical pellet having a diameter of 4 mm and a length of 4 mm (FIG. 1A).
This was subjected to a shear test using a compression tester as shown in FIG. First, the pellet was fixed to the support 22.
Next, a shearing force was applied by the crosshead 21 at a speed of 10 mm / min in the F direction, 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 was broken 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 simultaneously with the shear strength test.
When a shear force is applied to the pellet, resulting in breakage,
The area of the crosshead 21 was measured. The ratio (%) of the measured area to the cross-sectional area of the pellet was defined as the growth rate.

(3) Measurement of Viscosity Viscosity at 120 ° C. of some hot melt ink compositions of Examples and Comparative Examples 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) ...
◎ Exceeding 20 mPa · s (printing failure, printing impossible) ...
×

(4) Evaluation of Print Abrasion Resistance The hot-melt ink compositions of Examples and Comparative Examples were printed on various types of transfer materials using an on-demand type (impulse type) ink jet recording apparatus. The printing surface was rubbed with a clip, and the presence or absence of occurrence of printing 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 friction of more than 40 round-trips ... ◎ Dirt is generated by friction of 30 to 40 round-trips ... ○ Dirt is generated by friction of 30 round-trips or less ... ×

(5) Evaluation of Efflorescence The printed matter printed in the same manner as in (4) above was left at room temperature,
The print surface was observed at regular intervals. The results were evaluated as follows. The evaluation results are as shown in Tables 4 and 5. After leaving for 3 months or more, no blushing is visually observed ... ◎ Bleaching is visually observed in less than 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 properties (viscosity,
(Surface tension, melting point) was measured over time. And
The time until the initial physical properties were lost was evaluated as the life as follows. The evaluation results are as shown in Tables 4 and 5. Life 100 hours or more ◎ ◎ Life 10 hours or more and less than 100 hours ・ ・ ・ ○ Life less than 10 hours ・ ・ ・ ×

(7) Heat Resistance Evaluation Test (2) Some ink compositions of Examples and Comparative Examples
It was left in an environment of ° C., and the time required until the quality changed so as to affect the ink jet recording 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 Effort for Efflorescence Phenomena 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 (4) Evaluation of print scratch resistance. Leave printed matter at room temperature,
It was left in an environment of 40 ° C. and a relative humidity of 90%. After attaching fingerprints, it was allowed to stand at room temperature, and the appearance of efflorescence was evaluated as follows. The evaluation results are as shown in Tables 6 and 7. Leave at room temperature. No efflorescence occurred for more than 6 months.
◎ No efflorescence occurred for 3 months or more… ◎ 40 ° C-90% relative humidity No efflorescence occurred for 1 month or more ◎ ◎ Efficient phenomena occurred within 1 month… × Fingerprint 3 months or more for efflorescence No phenomena occurred ◎ ◎ White phenomena occurred within 3 months… ×

[0055]

[Table 9]

[0056]

[Table 10]

[0057]

[Table 11]

[Brief description of the drawings]

FIG. 1 (a) is a schematic view of a pellet-shaped ink composition used for evaluating a shear strength and a growth rate, and FIG. 1 (b) is a view for evaluating a shear strength and a growth rate. FIG. 3 is a view showing a compression tester used for the test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot melt ink composition 21 Crosshead 22 Support stand 23 Load cell

──────────────────────────────────────────────────続 き Continued on the front page (31) Priority claim number Japanese Patent Application No. 2-246525 (32) Priority date September 17, 1990 (September 17, 1990) (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application No. 2-246526 (32) Priority date September 17, 1990 (September 17, 1990) (33) Priority claim country Japan (JP) (72) Inventor Uehara Fumie 3-5-5 Yamato, Suwa City, Nagano Prefecture Seiko Epson Corporation (72) Inventor Ikuko Kawakami 3-5-5 Yamato, Suwa City, Nagano Prefecture Seiko Epson Corporation (56) References Special JP-A-63-210176 (JP, A) JP-A-4-211469 (JP, A) JP-A-4-211465 (JP, A) JP-A-1-308486 (JP, A) JP-A-4-359907 ( JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C09D 11/00-11/20

Claims (18)

(57) [Claims] 1. A hot melt ink composition comprising a vehicle and a coloring agent, 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. The method according to claim 1, wherein the dialkylbenzenesulfonamide is di-C
The hot melt ink composition according to claim 1, which is a _1-5 alkylbenzene sulfonamide. 4. The method according to claim 1, wherein the dialkylbenzenesulfonamide is 2,2.
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 4-ethylbenzenesulfonamide in the vehicle is 20 to 60% by weight. 8. The hot melt ink composition according to claim 1, further comprising a 4-nC _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 according to claim 1, wherein the acid value of the resin is 10 or more.
0 hot melt ink composition. 12. The method according to claim 1, wherein the acid value of the resin is 10 or more.
The hot melt ink composition as described in the above. 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 ink has a shear strength of 0.2 kg / mm ^2.
The hot melt ink composition according to claim 1, which is as described above. 16. The hot melt ink composition according to claim 1, further comprising a compound represented by the following formula (a). Embedded image (Wherein, R ¹ and R ² independently represent a hydrogen atom, a C _1-6 alkyl group, a 5- or 6-membered cycloalkyl group or a phenyl group, provided that R ¹ and R ² simultaneously represent a hydrogen atom Not represented. 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 coloring material, comprising 10 to 30% by weight of the coloring material, wherein the vehicle comprises a dialkylbenzenesulfonamide and / or a monoalkylbenzenesulfonamide and a resin. , Hot melt ink composition.