JPH03216379A - Ink jet recording medium and ink jet recording method - Google Patents

Abstract

PURPOSE:To eliminate the disturbance of an image on plain paper and to realize recording of high image quality by containing at least a colorant and a component formed into a high-molecular substance by the application of ultraviolet rays. CONSTITUTION:As a colorant itself, for example, an insoluble dye such as pigment or a disperse dye can be also used but a water-soluble dye represented by a direct dye, an acidic dye, a basic dye, a reactive dye or a dye for food is pref. used. Next, as a component formed into a high-molecular substance by the application of ultraviolet rays, a photopolymerization initiator and a polymerizable monomer or oligomer can be generally used. The colorant and the component formed into the high-molecular substance by the application of ultraviolet rays are usually mixed in a solvent such as water before use. The pref., concn. of the colorant is 1 - 10wt.% and that of the component formed into the high-molecular substance is 5 - 50wt.%. Further, it is necessary to determine a light emitting spectrum corresponding to the spectral sensitivity of the photopolymerization initiator in the component formed into the high- molecular substance to irradiate said component but, when the spectrum is set within the wavelength range of 250 - 450nm, the correspondence to the photopolymerization initiator becomes almost possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet recording method and an inkjet recording medium that are applied to printers, facsimile machines, copying machines, and the like.

[Conventional Technology] Conventionally, when inkjet recording is performed on so-called plain paper such as ordinary high-quality paper, image disturbances due to ink bleeding or overflowing occur, which poses a problem in achieving high image quality.

[Invention or Problem to be Solved] The present invention provides an inkjet recording medium and a recording method that eliminates image disturbance on plain paper and realizes high-quality recording without losing many of the advantages of inkjet. It is something.

[Means and effects for solving the problems] According to the present invention, an inkjet recording medium containing at least a colorant and a component that becomes polymeric when exposed to ultraviolet rays is used to selectively adhere to a recording medium. By irradiating an inkjet recording medium with ultraviolet rays, it is possible to obtain high-quality images without bleeding even on plain paper.

The coloring agent itself used in the ink of the tree invention may be a known one. For example, insoluble dyes such as pigments and disperse dyes can also be used, but preferred ones are direct dyes, acid dyes, and basic dyes. Water-soluble dyes 1 are typified by dyes, I-responsive dyes, food dyes, etc. It is particularly suitable for inkjet recording methods, and has excellent color development, clarity, stability,
It shall meet the required performance such as resistance to scratches.
For example, CI. Direct black 17, 19, 32, 51, 6
2,71,108,146,154:C. I. Direct Blue 6.22, 25, 71.86, 90, 106,
199 CI. Direct Red l, 4, 17, 28, 83: C. I Direct Yellow 12.24, 26, 44, 8
6,98,100,142. C. I. Direct Orange 34, 39, 44, 46.
60+ C. I Direct Violet 47, 48: C. I. Direct Brown 109, C. Direct dyes such as L Direct Green 59, C.I. I
．． acid black 2, 7, 24, 26, 31, 52,
63,112,118. C. ■ Acid Blue - 9.22, 40, 59, 93, 1
02,104,113,117,120,167,22
9,234,254;C. I. acid red 1, 6,
8, 32, 37, 51, 52, 80, 85, 87, 92
,94,115,180,256,317,315;C
．． I. Acid yellow 11.17, 23, 25, 29
, 42, 49, 61, 71: c. r. Acid Orange 7, 19, C. I. Acidic dyes such as Acid Violet 49, C.I.
I. Reactive Yellow 2.3, 13, 15, 17,
18, 23, 24, 37, 42, 57, 58, 64, 7
5,76,. 77, 79, 81, 84, 85, 87, 8
8, 91, 92, 93, 95, 102, 111, 115
,116,130, 131, 132, 133,
135, 136, 137, 139, 140, 14214
3,144,145,146,147,148, 1
51, 162, 163: CI reactive orange 5, 7, 11, 12, 13, 15, 16, 35, 4
5, 46, 56, 62, 70, 72, 74, 82, 84
, 87, 91, 92, 93, 95, 97.99+CI.
Reactive Red 3, 13, 16, 21, 22, 23
,24,29,31,33,35,45,49,55,
63,85,106,109,l I],112,l
．． 13,114,118,126,128,130,1
31, 141, 151, 170, 171, 174, 17
6,177,183,184,186,187,188
,190,193,194,195,196,200,
201, 202, 204, 206, 218, 221; {:. ■, Reactive Violet 1, 4, 5, 6,
22, 24, 33, 36, 38; (:.I Reactive Blue 2.3, 5, 8, 10, 1
3, 14, 15, 18, 19, 21, 25, 27, 28
,38,39.40,4l,49,52,63,7
．． 1, 72, 74, 75, 77, 78, 7
9,89, 100, 101, 104,10
5, 119, 122, 147, 158
,160, 162, 166, 169,
170, 171, 172, 173, 174
, 176, 179, 184, 190,
191, 194, 195, 198, 204
, 21 1, 216, 2 l 7 . C. I. Reactive green 5, 8, 12, 15, 1
9.23 C. I. Reactive Brown 2, 7, 8, 9, 1 1
,16,17,18,21,24,26,31,32,
33:C. I Reactive Black l. 5, 8, 13, 14
, 23, 31, 34.39, etc. are preferable, and other reactive dyes such as C. I. Basic black 2・C. I. Basic blue 1.3, 5, 7, 9, 24, 25, 26,
28, 29: C. I. Basic re-rid 1-Z)-Q +')
I': 114.37: C. I. Basic Violet 7, 14, 27; C.
I. Examples include Food Black 1.2.

Examples of pigments of the upper age group are particularly preferred for the inks of the present invention, but the pigments used in the inks of the present invention are not limited to these pigments.

Such dyes are generally present in the ink at a concentration of about 0.5
It is used in a proportion of ~30% by weight, more preferably 1-25% by weight.

Next, a photopolymerization initiator and a polymerizable oligomer or oligomer can generally be used as components to be polymerized by applying ultraviolet rays.

As photopolymerization initiators, dichromates or chromates such as ammonium dichromate, ammonium chromate, potassium dichromate, potassium chromate, sodium dichromate, sodium chromate, or benzoin methyl ether, penzoin isobu All commonly known compounds that generate radicals when exposed to light, such as penzoin alkyl ethers such as vinyl ether and a-methylolbenzoin ether, can be used.

These photopolymerization initiators can also be used in combination with various sensitizers, such as aliphatic amines such as triethanolamine, aromatic amines such as ethyl p-dimethylaminobenzoate, and verazine. Amines such as cyclic amines, ureas such as cyphenylurea,
Sulfur compounds such as sodium diethyl sithiophosphate, nitriles such as dimethylaminobenzonitrile, phosphorus compounds such as tri-n-butylphosphine, chlorine compounds such as hexagonal ethane, etc.
Dyes such as cyanine dyes are used depending on the purpose.

Examples of polymerizable monomers include acrylic acid, methacrylic acid derivatives, acrylamide, methacrylamide derivatives, and N-
Alkyl-substituted derivatives such as 1,000-mers having ethylenically unsaturated double bonds capable of addition polymerization such as vinylpyrrolidone, crotonic acid, bentenoic acid, tiglic acid, octenoic acid, α
- α, β monosubstituted products such as acetoxyacrylic acid, α-(3) monochloroacrylic acid, α(3) monobrolacrylic acid,
(meth)acrylic acid chloride, acrylic acid halides such as α-chloroacrylic acid chloride, acrylic acid such as acrylic acid metal salts such as sodium acrylate, methacrylic acid derivatives, N-methylacrylamide, N-ethylacrylamide, N such as N-isobrobyl acrylamide
- Monoalkyl conductors, N,N-dimethylacrylamide, N,N-ethylacrylamide, N,N-dibutylacrylamide, etc., N,N-dialkyl derivatives, diketone derivatives such as cyacetyl, hensyl, ketal, etc., acrylic sialylphyl sphine Examples include acrylamide and α-acrylamide derivatives such as acrylphosphine oxides such as oxides, acrylcyphenylphosphine oxides, etc.

The above-mentioned colorant and a component that becomes polymerized when exposed to ultraviolet rays are usually used by mixing them in a solvent such as water. The concentration is 1 to 10% by weight for the colorant and 5 to 5% for the polymerization component.
0% by weight is preferred.

Regarding the UV irradiation conditions, it is necessary to determine the emission spectrum according to the spectral sensitivity of the photopolymerization initiator among the polymerization components and irradiate it. It is compatible with photopolymerization initiators.

[Example] Example 1 Using the apparatus shown in FIG. 1 and the inkjet recording medium shown in Table 1, an image was recorded on wood-free paper to obtain a high-quality image with high sharpness. In FIG. 1, 1 is an inkjet recording medium of the present invention, 2 is an ultraviolet irradiation means, and 313n
It has an output of 40W with an emission spectrum of m peaks.

3 is an inkjet recording head, here 20
This is a BJ recording head that uses a 0 dpi multi-nozzle head to eject ink droplets using a thermal energy key. A conveying roller 4 conveyed the recording medium 6, that is, high-quality paper, at a process speed of 60 mm/sec.

Table 1 The image drawn in this way was clear and free of bleed on plain paper.

Embodiment 2 A case will be described in which a plurality of recording heads are used as shown in FIG. 2 is a germicidal lamp with an output of 40W. As shown in Table 2, the inks ejected from the inkjet heads 3a and 3b, which eject droplets using piezo elements, have different colorants and different colors. The inkjet heads 3a and 3b scanned the plain paper 5 in a direction substantially perpendicular to the direction in which it was conveyed by the conveyance roller 4 to record an image, thereby obtaining a high-quality image without bleeding.

Table 2 Example 3 As shown in FIG. 3, when a plurality of heads are used, a high-quality image can be obtained even with multicolor overlapping printing by irradiating ultraviolet rays after recording with each recording head.

The ultraviolet lamps 2a to 2d each have an output of 30W. The inkjet heads 3a to 3d, which eject ink using thermal energy, have 128 ejection ports or nozzles arranged at a density of 400 ddpi, and are arranged in the order of cyan, agenta, yellow, and black. Each hemisphere was arranged in parallel with an interval of 30 mm. The sides of each box are mirror-finished with aluminum to reflect ultraviolet rays, and are lined with high-quality paper. The high-quality paper was transported at a sub-scanning density of 400 dpi and a process speed of 50 mm/sec, and ink was selectively ejected from each head in synchronization. Table 3 shows the composition of the ink used here.

Table 3 [Effects of the Invention] As explained above, according to the present invention, by irradiating ultraviolet rays to the inkjet recording medium adhered to the recording holder and polymerizing it, a clear image without recording blur can be produced on the recording holder. You can get what you want regardless of your characteristics.

[Brief explanation of drawings]

1 to 3 are conceptual diagrams of the apparatus used in Examples 1 and 63, respectively. 1: Inkjet recording medium 2: Ultraviolet lamp 3: Inkjet head 4: Conveyance roller 5: Recording holder

Claims (1)

[Claims] 1. An inkjet recording medium containing at least a colorant and a component that becomes polymerized when exposed to ultraviolet light. 2. In a recording method using an inkjet recording medium containing at least a colorant and a component that polymerizes when exposed to ultraviolet rays, the inkjet recording medium selectively adhered to the recording medium may be irradiated with ultraviolet rays. Characteristic inkjet recording method.