JPH10110130A - Image-forming material and formation of image using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject material for ink-jet recording capable of developing excellent delivery from an ink head and adhesivity between a material to be recorded and powder, comprising a specific liquid resin and a liquid having a specific viscosity. SOLUTION: This material comprises (A) 0.1-50wt.% of a (meth)acrylic liquid resin which is composed of (A1 ) 10-99.9wt.% of a monomer of formula I(R<1> is H or CH3 ; R<2> is a 4-22C alkyl) or formula II (R<3> is a 1-5C alkyl or phenyl; (m) is 3-25; (n) is 1-3), (A2 ) 0.1-60wt.% of a ketone group-containing vinyl monomer containing two adjoining carbon atoms (one or more hydrogen atoms are bonded to at least one carbon atom), (A3 ) 0.1-60wt.% of a primary OH-containing vinyl monomer and (A4 ) 0-50wt.% of another polymerizable vinyl monomer and has 10,000-1,500,000 number - average molecular weight and 50,000-100,000 poise viscosity at 50 deg.C and (B) a liquid (e.g. water or ethylene glycol) having 0.001-10 poise viscosity at 25 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming material for ink jet recording and an image forming method.

[0002]

2. Description of the Related Art Among non-impact recording methods such as a laser printer using an electrophotographic method, high-speed recording is possible and printing is possible without any processing on plain paper. There has been remarkable progress in the recording method of the ink jet system capable of reducing the cost and the cost, and various types of ink jet recording apparatuses have been developed and commercialized.

In the ink jet recording method, recording is performed by flying small droplets of ink as a recording material and attaching the ink droplets to a recording material. The method for controlling the flight direction is roughly classified into several methods. Broadly speaking, ink droplets are continuously generated regardless of the presence or absence of an information signal, and the continuously generated ink droplets are selectively used in accordance with a print information signal. The method is called an on-demand type in which ink droplets are ejected and fly.

Each of the above-mentioned various ink jet systems has its own characteristics and advantages and disadvantages. However, nozzle clogging due to the precipitation of dyes, which are coloring components present in the ink, or coarse particles of pigments, etc., occurs in any of the ink jet systems. There is also a possibility that this may occur in the system, and many researchers continue to study methods for preventing the nozzle clogging, and various solutions have been proposed. For example, there is a method of covering the ink discharge nozzle when not in use, etc.
These methods are not fundamental, and after a long pause, nozzle clogging often still occurs,
The fact is that it has not been completely solved.

Further, in consideration of the above-mentioned problem of nozzle clogging, there is a limitation that a material which can be dissolved or easily dispersed in an ink solvent must be selected as a material to be used as a coloring agent. In order to prevent the dispersion from clogging the nozzle, a very advanced dispersion technique having an average particle diameter of about 0.05 μm is required. Further, it is necessary to give due consideration to the dispersant so that coarse particles which cause nozzle clogging due to agglomeration of primary particles due to aging do not occur.

In order to solve these problems, it is necessary to remove a coloring agent or a resin which causes clogging from the constituent materials of the ink, or to prepare an ink to which an adhesive is added and discharge these inks by ink-jetting. A method for adhering a specific powder onto ink to obtain various characteristics is disclosed in
-61494 and JP-A-3-89591. However, the powders that can be used are greatly restricted in order to utilize the solubility and affinity of the powders with the ink, or to simply add an adhesive in order to add adhesion to the recording material or powder. When mixed with a solvent, it is hardly sufficient in terms of operability and stability, such as adjustment of ejection performance from an inkjet head and elimination of nozzle clogging due to drying of ink around the head.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an ink jet system for printing by attaching ink droplets to a recording material in accordance with a print information signal. By providing an image-forming material having excellent dischargeability and good adhesion to the recording material and powder, the ink discharge head is formed by coarse particles of dye precipitates and pigments present in the ink as coloring components. In order to eliminate clogging, and also to solve problems that require advanced dispersion technology, so as not to contain coarse particles even for materials selected for the purpose of ink, and for the purpose of coloring In addition to the materials described above, various materials having various resistances and / or various functions that are usually difficult to make into ink for inkjet can be freely selected. It is intended to broaden the use range significantly.

[0008]

As a result of various studies to solve the above problems, the present inventor has found that good ejection from an ink jet head and adhesion to a recording material and powder are achieved. A good image forming material was found. That is, the present invention provides (meth) acrylic liquid resin (A)
% By weight and a viscosity of 0.001 to 10 poise (25
C.) of the liquid (B). (A) 10 to 99.9% by weight of an alkyl (meth) acrylic monomer represented by the formula (a-1) or (a-2), two adjacent carbon atoms (provided that at least one carbon atom (At least one hydrogen atom is bonded)
With a ketone group-containing vinyl monomer (b) having a
60% by weight, a primary hydroxyl group-containing vinyl monomer (c),
0.1 to 60% by weight, and a polymerizable vinyl compound (d) other than the above, comprising 0 to 50% by weight, having a number average molecular weight of 10,000 to 1,500,000 and a viscosity of 5 to 5%.
(Meth) acrylic liquid resin having 100,000 poise (50 ° C.).

The present invention is also directed to a method for ejecting an ink onto a recording material in accordance with a print information signal by an ink jet method, forming a latent image on the recording material in advance, and then forming a colored or colorless powder or a mixture thereof. The present invention also relates to an image forming method, characterized in that the above-mentioned image forming material is used when visualizing the image.

The image-forming material used in the present invention has a number average molecular weight of 10,000 to 1,500,000.
0.1 to 50% by weight of a liquid resin (A) having a viscosity of 5 to 100,000 poise (50 ° C.) and a liquid (B) having a viscosity of 0.001 to 10 poise (25 ° C.). . In the present invention, the liquid resin (A) is used in advance to form a sticky latent image by an ink jet method, and has a number average molecular weight of 10,000 to 1,500,000.
0, preferably 10,000 to 200,000 and viscosity of 5 to 100,000 poise (50 ° C.), preferably 1
The resin is not particularly limited as long as it is a resin having 0 to 50,000 poise (50 ° C.). If the viscosity is out of this range, the tackiness of the formed tacky latent image is low, and the amount of the colored powder adhered is not preferable. Further, when the molecular weight is out of this range, the tackiness of the latent image becomes poor, which is not preferable.

As such a liquid resin, the following (meth)
The use of an acrylic liquid resin is preferable because a high-molecular-weight, low-viscosity liquid polymer can be obtained, and thus an image-forming material containing a high concentration of the liquid resin can be obtained. The compounding amount of the liquid resin (A) used in the present invention is 0.1 to 70% by weight, preferably 0.5 to 50% by weight of the whole image forming material. If the compounding concentration of the liquid resin is lower than this, the tackiness of the formed latent image becomes poor, and it is not preferable because the adhesiveness of the colored powder is lacking. It is not preferable because the viscosity cannot be maintained.

The (meta) used in the present invention
The viscosity of the image forming material comprising the acrylic liquid resin (A) and the liquid (B) is 0.002 to 100 poise (25
° C), preferably 0.008 to 50 poise (25 ° C). A viscosity lower than this or a viscosity higher than this is not preferable because it is difficult to form an image by an ink jet method.

The acrylic liquid resin (A) is 10 to 99.9% by weight of an alkyl (meth) acrylic monomer represented by the following formula (a-1) or (a-2), A ketone group-containing vinyl monomer (b) having at least one carbon atom to which at least one hydrogen atom is bonded,
A primary hydroxyl group-containing vinyl monomer (c), 0.1 to 60% by weight, and a polymerizable vinyl compound (d) other than the above,
~ 50% by weight. CH ₂ = C (R ¹ ) COO-R ² (a-1) (wherein, R ¹ is a hydrogen atom or CH ₃ , R ² is a carbon atom 4
To 22 alkyl groups. _{) CH 2 = C (R1)} COO (CH 2n O) m R 3 (a-2) ( wherein, R ¹ represents a hydrogen atom or CH _3, R ³ is C 1 -C
An alkyl group or a phenyl group of 5 to 5, n is an integer of 1 to 3,
m represents an integer of 3 to 25, respectively. In the present invention, the alkyl acrylate-based monomer represented by the general formula (a-1) or the poly (alkylene) glycol acrylate-based monomer represented by the general formula (a-2) is prepared by forming a copolymer into a liquid. Is used as a component for

As the alkyl acrylate monomer represented by the general formula (a-1), for example, 2-ethylhexyl (meth) acrylate, butyl (meth) acrylate,
Pentyl (meth) acrylate, heptyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, nonyl (meth) acrylate,
Decyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, hexadecyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl ( There are alkyl (meth) acrylates having 4 to 22 carbon atoms such as meth) acrylate, nonadecyl (meth) acrylate, icosyl (meth) acrylate, henycosyl (meth) acrylate and docosyl (meth) acrylate. Acrylates with alkyl groups or the corresponding methacrylates are preferred. If the number of carbon atoms is 3 or less, it is difficult to obtain a liquid resin, and if the number of carbon atoms is 23 or more, the degree of polymerization is hardly increased, and the viscosity of the obtained liquid resin increases due to crystallization, which is not preferable.

Examples of the poly (alkylene) glycol acrylate monomer represented by the general formula (a-2) include triethylene glycol (meth) acrylate, tetraethylene glycol (meth) acrylate, and methoxytriethylene glycol (meth). Acrylate, methoxytetraethylene glycol (meth) acrylate, ethoxytetraethylene glycol (meth) acrylate, propoxytetraethylene glycol (meth) acrylate, n-butoxytetraethylene glycol (meth) acrylate, n-pentaxytetraethylene glycol (meth) Acrylate, tetrapropylene glycol (meth) acrylate, methoxytetrapropylene glycol (meth) acrylate, ethoxytetrapropylene glycol (meth ) Acrylate, propoxy tetrapropylene glycol (meth) acrylate, n-
Butoxytetrapropylene glycol (meth) acrylate, n-pentaxytetrapropylene glycol (meth) acrylate, polyethylene glycol (meth) acrylate, methoxypolyethylene glycol (meth)
Acrylate, ethoxy polyethylene glycol (meth) acrylate or phenoxytetraethylene glycol (meth) acrylate, phenoxyhexaethylene glycol (meth) acrylate, phenoxypolyethylene glycol (meth) acrylate, phenoxytetrapropylene glycol (meth) acrylate, among others By using an acrylate having a polyoxyalkylene chain as a repeating unit having 3 to 25, preferably 5 to 22 or a corresponding methacrylate, the viscosity of the copolymer can be effectively reduced. When the number of repeating units is 2 or less, it is difficult to obtain a liquid resin,
If it exceeds 26, the degree of polymerization is hardly increased, and
However, since it is a solid, the viscosity increases, and the water resistance of the coated product is inferior.

In the present invention, the acrylic monomer (a-
1) or (a-2) is used in an amount of 10 to 99.9% by weight, preferably 50 to 10% by weight, based on the liquid resin as a copolymer.
99% by weight of the acrylic monomer (a
-1) or (a-2) is 50% by weight, especially 10% by weight
If the amount is smaller, it is not preferable because the copolymer cannot maintain the liquid state and the powder has poor adhesion to the formed latent image. In addition, acrylic monomers (a-
The combination use of (1) and (a-2) is preferable from the viewpoint of decreasing the viscosity and improving the compatibility. In this case, the acrylic monomer (a-1)
The ratio between (a-2) and (a-2) is preferably from 1: 9 to 9: 1 in molar ratio.

In the present invention, when the aqueous liquid (B) is used, the blending ratio of the acrylic monomers represented by (a-1) and (a-2) is set to (a-1): (A-
2) It is preferable to use them in a mixing ratio (molar ratio) of = 0: 10 to 6: 4.

In the present invention, a ketone group-containing vinyl monomer (b) having two adjacent carbon atoms (where at least one hydrogen atom is bonded to at least one carbon atom) and a primary hydroxyl group-containing vinyl monomer (c) ) Is to enhance the compatibility between the (meth) acrylic liquid resin and other compositions by introducing a cross-linking site by a dehydration reaction represented by the following general formula (3), or to coat the powder after visualization. It is used for the purpose of fixing to recording material.

The ketone group-containing vinyl monomer of the present invention comprises
By using this, a structure in which a ketone group having two adjacent carbon atoms (but at least one hydrogen atom is bonded to at least one carbon atom) is introduced into a side chain, and an ester group or Compounds having only a carboxyl group are excluded, but it is also possible to use an ester group or a carboxyl group-containing compound in the molecule. Examples of the ketone group-containing vinyl monomer include 4- (meth) acryloyl-2-butanone and 3- (meth) acryloyl-2-butanone.
(Meth) acryloyl-2-butanone, 2- (meth) acryloyl-3-methyl-2-butanone, 5- (meth)
(Meth) acryloylalkylketone compounds such as acryloyl-2-pentanone, 4- (meth) acryloyl-4-methyl-2-pentanone, diethyl methacryloyldiacetylmethaneacryloylmalonate, acryloylacetylacetone, vinyl methyl ketone, vinyl ethyl ketone, Vinyl alkyl ketone compounds such as vinyl isobutyl ketone, hydroxymethyl vinyl ketone, t-butyl vinyl ketone neopentyl vinyl ketone, α-chlorovinyl methyl ketone, mesityl oxide, acetoacetoxyethyl (meth) acrylate or diacetone acrylamide, benzalacetone And the like.

The ketone group-containing vinyl monomer is 0.1 to
It is preferable to use 60% by weight, preferably 0.1 to 40% by weight. If the amount is more than this, the affinity with water is poor, which is not preferable. If the amount is less than this, a cured product having a high degree of crosslinking cannot be obtained. If the amount is less than this, it is not preferable because the adhesion to the colored powder or the base material becomes poor at the time of image formation, and if the amount is more than this, the resin cannot maintain a liquid state, and the formed latent image It is not preferable because the adhesiveness of the powder becomes poor.

The primary hydroxyl group-containing vinyl monomers used in the present invention include acrylic monomers and ethylene monomers. As acrylic monomers,
For example, ethylene glycol (meth) acrylate, 4
-Hydroxybutyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, tetraethylene glycol (meth) acrylate, tetrapropylene glycol (meth) acrylate, polyethylene glycol (meth) acrylate, ethylene glycol acrylate, 4-hydroxybutyl acrylate, There are acrylic monomers having a hydroxyl group such as 3-hydroxypropyl acrylate, tetraethylene glycol acrylate, tetrapropylene glycol acrylate, polyethylene glycol acrylate, N- (hydroxymethyl) acrylamide, N- (hydroxyethyl) acrylamide, and diacetone acrylamide. Examples of the ethylene monomer include vinyl monomers having a primary hydroxyl group such as allyl alcohol, 4-hydroxy-1-butene, 4-hydroxymethylstyrene, 4-hydroxyethylstyrene, and 1,4-dihydroxy-2-butene. is there.

The primary hydroxyl group-containing vinyl monomer is 0.1%
It is preferably used in an amount of up to 60% by weight, preferably 0.1 to 40% by weight. If it is more than this, it is not possible to maintain a liquid having an appropriate viscosity, it is not preferable because water resistance after curing is poor, and if it is less than this, when forming an image, the recording material or powder and This is not preferred because the adhesion of the resin becomes poor.

In the present invention, other polymerizable vinyl compounds can be used as long as the liquid state of the resin can be maintained, in order to improve the water resistance of the developed image and the adhesion to the recording material. Specifically, aromatic monomers such as styrene and vinyl toluene, (meth) acrylates having an alkyl group having 2 or less carbon atoms such as methyl methacrylate and ethyl methacrylate, methoxydiethylene glycol (meth) acrylate, phenoxydiethylene glycol (meth) acrylate, An alkoxy group such as phenoxyethylene glycol (meth) acrylate, a (meth) acrylate monomer containing a phenoxy group, maleic anhydride, maleic acid, fumaric acid, itaconic acid, citraconic acid, or an alkyl or alkenyl monoester thereof; Β- (meth) acryloxyethyl monoester phthalate, β- (meth) acryloxyethyl monoester isophthalate, β- (meth) acryloxyethyl monoester terephthalate, succinic beta-(meth) acryloxyethyl monoester, acrylic acid, methacrylic acid, crotonic acid,
Vinyl monomers having a carboxyl group such as cinnamic acid, and further, for example, (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl-
(Meth) acrylamide, N-ethoxymethyl- (meth) acrylamide, N-propoxymethyl- (meth)
Monoalkylol (meth) acrylamide such as acrylamide, N-butoxymethyl- (meth) acrylamide, N-pentoxymethyl- (meth) acrylamide,
N, N-di (methylol) acrylamide, N-methylol-N-methoxymethyl (meth) acrylamide,
N, N-di (methoxymethyl) acrylamide, N-ethoxymethyl-N-methoxymethylmethacrylamide, N, N-di (ethoxymethyl) acrylamide, N
-Ethoxymethyl-N-propoxymethyl methacrylamide, N, N-di (propoxymethyl) acrylamide, N-butoxymethyl-N- (propoxymethyl) methacrylamide, N, N-di (butoxymethyl) acrylamide, N-butoxy It has an amide group such as dialkylol (meth) acrylamide such as methyl-N- (methoxymethyl) methacrylamide, N, N-di (pentoxymethyl) acrylamide, and N-methoxymethyl-N- (pentoxymethyl) methacrylamide. There are vinyl monomers.

The amount of other polymerizable vinyl compounds used is
It is 0 to 50% by weight, preferably 0 to 40% by weight, based on the liquid resin which is a copolymer, and when the amount is more than 40% by weight, especially more than 50% by weight, the viscosity of the liquid resin becomes high, and eventually the liquid resin is maintained. It is not preferable because it cannot be obtained.

In the present invention, the liquid (B) is used for adjusting the viscosity and surface tension of the image forming material for forming a latent image by an ink jet system, and has a viscosity of 0.0
The liquid is not particularly limited as long as it is a liquid of 01 to 10 poise (25 ° C.). Examples of the liquid include water, organic solvents such as alcohols, ethers, glycols, ketones, esters, and hydrocarbons, various monomers, and mixtures thereof, in addition to water.

Particularly when the image forming material is water-based, the solvent used may be ethylene glycol, diethylene glycol, propylene glycol, triethylene glycol, polyethylene glycol, glycerin, tetraethylene glycol, dipropylene glycol, ketone alcohol, diethylene glycol monobutyl ether, Ethylene glycol monobutyl ether, ethylene glycol monoethyl ether, 1,2-hexanediol,
N-methyl-2-pyrrolidone, substituted pyrrolidone, 2,
4,6-hexanetriol, tetrafurfuryl alcohol, 4-methoxy-4-methylpentanone and the like. In particular, when dryness on a recording medium is required, alcohols such as methanol, ethanol, and isopropyl alcohol can be used for the purpose of speeding up drying.

In the case of an aqueous image forming material, an antifungal agent can be added to prevent the generation of mold. Examples of the fungicide include sodium dehydroacetate, sodium benzoate, sodium pyridinethione-1-oxide, zinc pyridinethione-1-oxide, 1,2-
An amine salt of benzisothiazolin-3-one, 1-benzisothiazolin-3-one or the like is used. In addition, a pH adjuster for obtaining the stability of the ink and the stability of the liquid piping in the apparatus, an antifoaming agent for preventing the generation of bubbles when the ink is manufactured, moved, and circulated in the apparatus, and the like. Can be used within a range that does not hinder use.

The image forming material adjusted as described above is
After discharging using an ink-jet method and forming a latent image on the recording material in advance, the powder is directly contacted with the powder on the latent image with a brush or a roller, or by dusting or static electricity by sieving. The latent image is visualized by indirect contact. At the time when the powder is brought into contact with the latent image portion, the degree of drying of the ink on the recording material is not particularly limited, and the wettability of the powder to the solvent in an undried state may be determined depending on the powder used. The contact may be made by utilizing.

Excess powder attached to the non-image area is removed by blowing or suctioning with air, or using an adhesive roller or the like. For the visualized powder, no particular fixing step is required, and the powder particles adhering to the ink are directly impregnated or adhered to the recording material, but are further used in ordinary copying machines or printers. By using a fixing method using heat or pressure, or using a fixing device, the adhesion between the recording material and the powder can be further improved. Depending on the application, post-processing such as lamination may be performed to protect the surface.

As the ink jet system that can be used in the present invention, various systems and devices conventionally known can be applied. For example, in the case of a continuous type in which ink droplets are continuously ejected and formed into particles, the present invention can be applied to a charge control type, a divergence control type, and the like. In addition, the on-demand type can be applied to a pressure control method of ejecting ink droplets from an orifice by mechanical vibration of a piezoelectric vibrating element, a heat control method using a heating resistor element, and the like. It is not limited.

The recording medium that can be used in the present invention is not particularly limited, and examples thereof include paper, a plastic film, a metal plate, and wood. In addition, since it is a non-contact method, it can be applied not only to a flat surface or a curved surface but also to an uneven surface or a three-dimensional object.

The powder that can be used in the present invention is not limited at all, and known pigments and dyes conventionally used as powder coloring materials or a mixture of both can be used. For example, as a dye,
Direct dyes, acid dyes, basic dyes, mordant dyes, metal-containing dyes, vat dyes, sulfur dyes, reactive dyes, disperse dyes, alcohol-soluble dyes, oil-soluble dyes, etc. Acridine dye, aniline black, anthraquinone dye, azine dye, azo dye, azomethine dye, benzo and naphthoquinone dye, indigoid dye, indophenol, indoaniline, indamine,
Leuco vat dye ester, naphtholimide dye, nigrosine and indulin, nitro and nitroso dye, oxazine and dioxazine dye, oxidation dye, phthalocyanine dye, polymethine dye, quinophthalone dye, tri and diallyl methane dye, thiazine dye, thiazole dye, xanthene dye And the like. Organic pigments include nitroso, nitro, phthalocyanine, insoluble azo, poorly soluble azo, soluble azo, basic dye lake, acid dye lake, vat dye lake, quinacridone, dioxazine, Perylene, isoindolinone, imidazolone, pyranthrone,
Thioindigos and the like, and inorganic pigments include carbon black, titanium white, cobalt oxide, barium sulfate, calcium carbonate, magnesium carbonate, navy blue and the like.

Further, metal powder such as gold powder, silver powder, aluminum powder and the like, or metal foil can also be used. Also,
Ceramics, fluorescent substances, magnetic powder, colorless or colored glass beads, etc. can also be used. Further, a colored resin powder (toner) obtained by kneading the above-mentioned dye / pigment with a thermoplastic resin and pulverizing it into fine powder can be used. Alternatively, even if only the thermoplastic resin powder is adhered, a prominent image can be obtained. In any case, the material is not limited to these materials, and is not limited to a material for coloring, and various resistances such as weather resistance, corrosion resistance, and / or ultraviolet light, which are usually difficult to form an ink for inkjet use. Various powders having functions such as absorption and conductivity can be used as the material for visualization. Furthermore, by repeating the steps provided by the present invention and visualizing various powders in accordance with the printing information, for example, a multicolor image is obtained when the powder is a coloring material, and the powder is used when the other powder is used. A more highly functionalized product is obtained for the purpose.

As a method for producing the toner usable in the present invention, a conventionally known method can be used. As a general method, a thermoplastic resin serving as a binder and a dye / pigment serving as a coloring component are heated and melted and kneaded with a hot roll or the like, cooled, pulverized and classified, and powdered with a particle diameter of 5 to 15 μm. A method of obtaining a material, a method of dissolving a resin serving as a binder, mixing a dye / pigment serving as a coloring component, kneading the mixture with a disperser such as a ball mill and an attritor, drying and pulverizing and classifying the powder having a particle diameter of 5 to 15 μm; There is a method of obtaining a body coloring material. Further, there is no problem in adding a third component other than the dye and pigment when producing the toner.

[0035]

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. W in the example
The term "t%" indicates% by weight.

The methods for measuring the number average molecular weight and the viscosity in this example are described below. 1) Number average molecular weight: The value in terms of styrene in gel permeation chromatography (TOSOH SC-8020) was adopted. As the molecular weight distribution (Mw / Mn), a value obtained by using the same measuring instrument was adopted. 2) Viscosity: Rheometer (manufactured by Rheometrics: RDS-)
II, RFS-II) A shear rate of 1 to 10 / sec by a steady viscosity measurement method was adopted.

◎ Abbreviations of the following compounds used in Examples and Comparative Examples are described. 1) Compound used for the synthesis of acrylic liquid resin (A) PEG9MA: methoxypolyethylene glycol (# 4
00) methacrylate PEG4MA: methoxytetraethylene glycol methacrylate EHA: 2-ethylhexyl acrylate BA: butyl acrylate PEG2MA: methoxydiethylene glycol methacrylate AA: acrylic acid VK: vinyl ketone 4HBA: 4-hydroxybutyl acrylate MAH: maleic anhydride 2) Liquid ( Solvent used for B) W: Water EG: Ethylene glycol EOH: Ethanol G: Glycerin IPA: Isopropyl alcohol PEG300: Polyethylene glycol (# 300) EtAc: Ethyl acetate 3) Powder material RED1: Finess RED F2B (Toyo Ink Manufacturing ( RED2: Styrene-acrylic acid copolymer resin
95 parts molecular weight (Mn: about 8,0000, Mw: about 200,00
0) Glass transition point Tg: 63 ° C., degree of polymerization 800 Pigment (Finess RED F2B: manufactured by Toyo Ink Mfg. Co., Ltd.) 5 parts were heated and melt-kneaded with a hot three-roll mill, cooled, and then pulverized and classified. Powder colorant having a diameter of 10 μm. BLUE1: Styrene-acrylic acid copolymer resin
95 parts molecular weight (Mn: about 8,0000, Mw: about 200,00
0) Glass transition temperature Tg: 63 ° C., degree of polymerization 800 5 parts of a pigment (Lionol Blue FG-7351: manufactured by Toyo Ink Mfg. Co., Ltd.) are heated, melted and kneaded with a hot three-roll mill, cooled and then pulverized and classified. Average grain size 10μm
Powder coloring material. BLACK1: Styrene-acrylic acid copolymer resin
95 parts molecular weight (Mn: about 8,0000, Mw: about 200,00
0) Glass transition point Tg: 63 ° C., degree of polymerization 800 Pigments (Black Pearls 480: manufactured by Cabot) 2.5 parts are heated and melt-kneaded with a hot roll of three, cooled, and pulverized and classified to obtain an average particle diameter of 10 μm. Powder coloring material.

Examples 1 to 3 Synthesis of (meth) acrylic liquid resin (A) and measurement of physical properties In a 500 ml four-necked round bottom flask equipped with a stirrer, a nitrogen inlet tube, a temperature sensor, and a condenser,
Compounds were blended according to the composition shown in Table 1, azobisisobutyronitrile (AIBN) was used as an initiator (1% by weight based on the total monomer charge), and isopropyl alcohol / water =
In 4/1 solvent (concentration at the time of charging monomer: 33% by weight)
After refluxing for 6 hours in a hot water bath set at 85 ° C., AI
BN was further added at 0.1% by weight, and heating and stirring were continued for another 2 hours. After the reaction was completed, a diversion tube was set between the reactor and the condenser. The temperature of the water bath was raised to 95 ° C., and isopropyl alcohol / water was distilled off while stirring at normal pressure to obtain a viscous liquid resin. The number average molecular weight (M
n), molecular weight distribution (Mw / Mn), and viscosity (50
C) are shown in Table 1.

[0039]

[Table 1]

Examples 4 to 6 Image forming materials were prepared by diluting the acrylic liquid resin (A) obtained in Examples 1 to 3 with various liquids (B). Table 2 shows the type of acrylic liquid resin (A) used (indicated by the example number), and the test results of the viscosity and dischargeability of the obtained image forming material.

[0041]

[Table 2]

Examples 7 to 9 A polyester film was obtained from the pressure-controlled on-demand type ink jet output device in which the image forming material obtained in Examples 4 to 6 ejected ink droplets from an orifice by mechanical vibration of a piezo vibrating element. A transparent latent image was formed by discharging the powder on the surface, and thereafter, the powder material was brought into contact with the latent image to visualize the latent image. Excess powder material existing in portions other than the latent image was suctioned by a pneumatic suction device.

[0043]

[Table 3]

[0044]

By using the image forming material of the present invention and the image forming method using the same, the nozzle clogging of the ink discharge head in the ink jet type image forming apparatus, which has been a conventional problem, is solved. Coloring material or /
In addition, it is possible to provide an image forming method using an ink jet system which has very few restrictions on selection of a material to be used, such as fine powder and the like.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI C08L 55/00 C09D 11/10 C09D 11/10 133/06 133/06 133/06 C08F 220/18 // C08F 220/18 290/06 290 / 06 B41J 3/04 101Y (C08K 5/04 5:05 5:10) (C08F 220/18 220: 26 216: 38) (72) Inventor Dai Ota 2-3-13-1 Kyobashi, Chuo-ku, Tokyo Toyo Inki Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. The following (meth) acrylic liquid resin (A)
An image forming material for ink jet recording comprising a liquid (B) having a concentration of 0.1 to 50% by weight and a viscosity of 0.001 to 10 poise (25 ° C.). (A) 10 to 99.9% by weight of an alkyl (meth) acrylic monomer represented by the following formula (a-1) or (a-2), two adjacent carbon atoms (provided that at least one carbon atom (At least one hydrogen atom is bonded)
With a ketone group-containing vinyl monomer (b) having a
60% by weight, a primary hydroxyl group-containing vinyl monomer (c),
0.1 to 60% by weight, and a polymerizable vinyl compound (d) other than the above, comprising 0 to 50% by weight, having a number average molecular weight of 10,000 to 1,500,000 and a viscosity of 5 to 5%.
(Meth) acrylic liquid resin having 100,000 poise (50 ° C.). CH ₂ = C (R ¹ ) COO-R ² (a-1) (wherein, R ¹ is a hydrogen atom or CH ₃ , R ² is a carbon atom 4
To 22 alkyl groups. ) CH ₂ ＣC (R ¹ ) COO (C _n H _2n O) _m R ³ (a-2) (wherein R ¹ is a hydrogen atom or CH ₃ , R ³ is a carbon atom of 1)
To 5 alkyl groups or phenyl groups, n represents an integer of 1 to 3, and m represents an integer of 3 to 25, respectively. ) 2. A composition having a viscosity of 0.002 to 100 poise (25
C.). 3. Ink is ejected onto a recording material in accordance with a print information signal by an ink-jet method to form a latent image on the recording material in advance, and then visualized with a colored or colorless powder or a mixture thereof. An image forming method, comprising using the image forming material according to any one of claims 1 to 2 when forming.