JPH091920A - Resin composition for ink jet recording material - Google Patents

Abstract

PURPOSE: To obtain resin composition for ink jet recording material having excellent ink absorption capacity, clear recording image, excellent moisture and heat resistance and durability by incorporating specific weight ratio of crosslinked polyalkylene oxide resin and polyamide resin. CONSTITUTION: The resin composition suitable for the ink jet recording material is prepared from the mixture containing 20 to 95wt.% of crosslinked polyalkylene oxide resin and 80 to 5wt.% of polyamide resin. Or, the resin composition is prepared from the mixture containing 20 to 95wt.% of crosslinked polyalkylene oxide resin, 80 to 5wt.% of polyamide resin and 50wt.% or less of ethylene vinylalcohol copolymer resin. The crosslinked polyalkylene oxide resin is obtained by preferably reacting polyalkylene oxide with diol by isocyanate compound. The resin having 2000 to 200,000 poise of melting viscosity by loading 50kg/cm<2> at l70 deg.C and 10 to 45g/g of water supply power (g pure/g resin) is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording material resin composition used for ink jet recording using an aqueous ink. More specifically, the present invention relates to a resin composition for an inkjet recording material, which has excellent ink absorbing ability, a clear recorded image, and excellent wet heat resistance and water resistance.

[0002]

2. Description of the Related Art Inkjet printer recording mode is high speed, low noise, low printing cost, simple mechanism, small and light weight, easy multi-color, easy enlargement of image,
It has many characteristics such as no need for developing and fixing and a high flexibility of recording patterns, and is widely used as a method of obtaining a hard copy including not only characters but also image processing. On the other hand, while the use of OHP sheets and POP sheets is expanding,
A printer capable of printing on an OHP sheet or a POP sheet is required as a printer. Further, as ink jet printers have become widespread, many types of inks for printers have been put on the market, and multi-color printing has also spurred an increase in the types of inks.

The quality required for these OHP and POP sheets is as follows: (1) Fast fixing of various inks to the sheet, and good quality, and no ink dripping after printing; ) The ink density is high and the color development is excellent; (3) The ink droplets do not diffuse on the sheet, and the diameter of the dots does not become larger than necessary; (4) The wet heat resistance and water resistance of the ink image are improved. In order to meet these requirements, various water-soluble inks have been developed, and recording sheets suitable for these inks have been proposed.

However, there is no recording material satisfying all of these items, and particularly when an aqueous ink is used, the recorded image lacks water resistance, is splashed with water, and causes bleeding even when stored under high humidity. There is. For example, JP-A-60-171143 and JP-A-59-20.
Japanese Patent No. 7277 discloses a recording material for a water-soluble ink, which is provided with an ink absorbing layer containing a water-soluble polymer having an ionic hydrophilic group or a water-soluble substance and a polyhydric alcohol-soluble substance on a substrate. However, the water resistance is not sufficient. Further, as a method for improving water resistance, JP-A-56-58869 discloses a method of insolubilizing a water-soluble polymer after inkjet recording on a recording sheet coated with the water-soluble polymer. Can not stand. For this reason, it has been desired to develop a material that has a high ink absorption rate, high resistance to moist heat, and high water resistance.

Further, in the OHP sheet and the like, the transparency of the ink fixing layer is required. Further, as a method for producing a recording material for aqueous inkjet, a method of coating an ink fixing layer on a plastic sheet is currently employed. However, in order to obtain a dry film without using a solvent, processing based on a thermoplastic resin is performed. Good properties are also desired.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a water-based ink which is excellent in processability, in particular, has a high ink fixing speed, and is excellent in moist heat resistance, water resistance and transparency. An object of the present invention is to provide a resin composition for a recording material, which is optimum for the inkjet recording used.

[0007]

Means for Solving the Problems As a result of intensive studies aimed at solving the above-mentioned problems in ink jet recording materials, the present inventors have found that a crosslinked polyalkylene oxide resin and a specific polyamide resin are used in combination. According to the present invention, it has been found that it is possible to provide a resin composition for a recording material, which is excellent in processability, has excellent ink absorption ability, has a clear image, and is excellent in wet heat resistance and water resistance, and is suitable for aqueous inkjet recording, and to complete the present invention. I arrived. Further, the inventors of the present invention have excellent transparency in addition to the above-mentioned moist heat resistance and water resistance by using an ethylene / vinyl alcohol copolymer resin in combination with the crosslinked polyalkylene oxide resin and the specific polyamide resin. The inventors have found that a resin composition for an inkjet recording material can be provided and completed the second invention of the present application.

That is, the composition of the present invention is characterized by containing 20 to 95% by weight of a crosslinked polyalkylene oxide resin and 80 to 5% by weight of a polyamide resin. Also,
The composition of the second invention of the present application is characterized in that it comprises 20 to 95% by weight of a crosslinked polyalkylene oxide resin, 80 to 5% by weight of a polyamide resin, and 50% by weight or less of an ethylene / vinyl alcohol copolymer resin. .

In the present invention, the cross-linked polyalkylene oxide resin has excellent ink absorption properties and sharpness of recorded images, and the polyamide resin has excellent wet heat resistance and water resistance and ethylene / vinyl alcohol It is considered that the polymer having excellent transparency has a synergistic effect without losing the advantages of each other even when these are used in combination.

The crosslinked polyalkylene oxide resin used in the present invention is obtained by reacting a polyalkylene oxide and a diol with an isocyanate compound.
Melt viscosity of 200 at 70 ° C and 50 kg / cm ² load
Water absorption capacity (g pure water / g resin) is 0 to 200,000 poise
A resin of 0 to 45 g / g is preferably used. When the melt viscosity is less than 2000 poise, and the water absorption capacity is 45 g / g
If it exceeds, the wet heat resistance and water resistance of the recorded image are also deteriorated, which is not preferable. Further, when the melt viscosity is more than 200,000 poise and the water absorption capacity is less than 10 g / g, the compatibility with the polyamide resin and the ethylene / vinyl alcohol copolymer becomes poor, and the film surface state during film processing becomes poor. It is not preferable because it causes problems such as deterioration. The addition ratio of the crosslinked polyalkylene oxide resin is usually 20 to 95 with respect to the total weight of the resin composition of the present invention.
%, Preferably 30 to 90% by weight. If it is less than 20% by weight, the initial printing performance is deteriorated, and if it exceeds 95% by weight, the wet heat resistance and water resistance are deteriorated, which is not preferable.

As the polyalkylene oxide constituting the crosslinked polyalkylene oxide resin, those having a weight average molecular weight of 500 to 500,000 are preferably used, and examples thereof include polyethylene oxide, polypropylene oxide, and ethylene oxide / propylene oxide copolymers. Examples thereof include polybutylene oxide and a mixture thereof. Particularly, polyethylene oxide, polypropylene oxide, a mixture thereof or a copolymer thereof having a weight average molecular weight of 2000 to 100,000 is preferably used. When the weight average molecular weight is less than 500, the melt viscosity of the obtained crosslinked polyalkylene oxide resin is too low, and when the weight average molecular weight exceeds 500,000, the melt viscosity becomes extremely high. It is not preferable because it causes a compatibility problem.

As the diol which constitutes the crosslinked polyalkylene oxide resin together with the polyalkylene oxide,
Organic compounds having two hydroxyl groups (-OH) in the same molecule, for example, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol,
Trimethylene glycol, 1,3-butanediol, 2,
3-butanediol, 1,4-butanediol, 1,5-
Pentanediol, hexylene glycol, octylene glycol, glyceryl monoacetate, glyceryl monobutyrate, 1,6-hexanediol, 1,9-nonanediol, bisphenol A and the like can be mentioned. Preferably, ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-butanediol, 1,9-nonanediol and the like are used.

The isocyanate compound used for crosslinking the above polyalkylene oxide and diol is an organic compound having two isocyanate groups in the same molecule, for example, xylylene diisocyanate (XD).
I) 4,4'-diphenylmethane isocyanate (MD
I), hexamethylene diisocyanate, 1,8-dimethylbenzol-2,4-diisocyanate, 2,4-tolylene diisocyanate (TDI), TDI trimer, polymethylene polyphenyl isocyanate, trimethylol propane and other polyols Examples thereof include urethane isocyanate compounds and polyisocyanate adducts obtained by reacting a molar number of diisocyanates corresponding to the number of active hydrogens. Preferably, 4,4'-diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate, 2,4-tolylene diisocyanate (TDI) and the like are used.

The proportions of the above polyalkylene oxide, diol and isocyanate compound used are the ratio (R value) of the sum of the terminal hydroxyl groups of the polyalkylene oxide and the number of hydroxyl groups of the diol and the number of isocyanate groups of the isocyanate compound (-value) (- NCO group / -OH group) is 0.5 to 2.
It is selected in the range of 0, preferably in the range of 0.8 to 1.7. When the R value is less than 0.5, the crosslink density becomes low and a crosslinked polyalkylene oxide resin having sufficient solvent absorption cannot be obtained. On the other hand, when the R value exceeds 2.0, the crosslink density increases and However, this is not preferable because the melt viscosity becomes high and the workability during molding deteriorates.

The number of moles of polyalkylene oxide can be determined by dividing its weight by the weight average molecular weight. When the diol is added, it is added during the crosslinking reaction between the polyalkylene oxide and the isocyanate compound. By adding a diol, the melt viscosity of the obtained crosslinked polyalkylene oxide can be reduced, and processability is improved.

The amount of the isocyanate compound used varies depending on the type of the isocyanate compound and the reaction conditions, but is generally 0.5 to 80 parts by weight, preferably 1 to 50 parts by weight with respect to 100 parts by weight of the polyalkylene oxide.
It is in the range of parts by weight. If the amount is less than 1 part by weight, the crosslinking density of the obtained crosslinked polyalkylene oxide resin is low and sufficient film strength cannot be obtained. On the other hand, if it is used in excess of 80 parts by weight, the obtained crosslinked polyalkylene oxide resin is obtained. The cross-linking density is too high and the processing temperature at the time of molding into a film becomes high, which makes molding difficult, which is not preferable.

As a method of reacting the polyalkylene oxide and the diol with the isocyanate compound, a method of reacting in a solution using an appropriate solvent is generally used.
A method of reacting in a dispersed state or a method in which both of them are uniformly mixed in a powder or solid state and then heated to a predetermined temperature can be reacted, but from the viewpoint of industrial implementation, each raw material is continuously melted. A method of supplying and mixing and reacting in a multi-screw extruder is preferable. The reaction temperature of the above reaction is usually 50 to 21.
0 ° C. The reaction can be promoted by adding a small amount of triethylamine, triethanolamine, dibutyltin diacetate, dibutyltin dilaurate, stannas octoate, triethylenediamine or the like to this reaction system.

As the polyamide resin used in the present invention, a resin having a crystallinity of 0 to 50% and a melting point or Tg (glass transition point) of 70 to 190 ° C. is preferably used. Specific examples include 8 nylon (alcohol-soluble nylon), 11 nylon, 12 nylon, 6/66/12 copolymer nylon, amorphous nylon, and transparent nylon resin. If the crystallinity exceeds 50% and the melting point or Tg exceeds 190 ° C., the compatibility with the crosslinked polyalkylene oxide becomes poor, and the processing temperature becomes high, so that the crosslinked polyalkylene oxide may be decomposed. It is not preferable because it exists. The proportion of polyamide resin added is
It is usually 80 to 5% by weight, preferably 60 to 10% by weight. If the addition ratio is less than 5% by weight, the effect of improving the moist heat resistance and water resistance is small, while if it exceeds 80% by weight, the ink absorption performance is lowered and a clear image cannot be obtained, which is not preferable.

The ethylene / vinyl alcohol copolymer resin used in the present invention has an ethylene content of 25 to 5
A commercially available product having 0 mol% and a melting point of 190 ° C. or lower is preferably used. The addition ratio of the ethylene / vinyl alcohol copolymer resin is usually 50% by weight or less, preferably 1 to 50% by weight, more preferably 5 to 50% by weight.
40% by weight. Even if the addition ratio exceeds 50% by weight, the effect corresponding to it cannot be obtained, and the ink absorption performance is rather deteriorated, which is not preferable.

The resin composition for a recording material of the present invention comprises a cross-linked polyalkylene oxide resin, a polyamide resin and, if necessary, an ethylene / vinyl alcohol copolymer resin, which are generally used in extruders, kneaders, rolls and the like. It is obtained by kneading with a machine. The obtained resin composition can be molded into a sheet by inflation molding or T-die extrusion. Further, the composition and a thermoplastic resin such as PP or LDPE may be formed into a sheet having a thermoplastic resin as a support layer by inflation molding or coextrusion with a T die or the like. At this time, polyethylene, polypropylene, polyvinyl chloride, ethylene acrylate, for the purpose of increasing the adhesion between the support layer and the ink fixing layer,
Ethylene methacrylate, ethylene-acrylic acid copolymer, ethylene-vinyl acetate copolymer, acrylonitrile-styrene-butadiene copolymer, ethylene / acrylic acid ester maleic acid terpolymer, olefin-based thermoplastic elastomer, styrene-based heat Plastic elastomer,
A thermoplastic resin such as a urethane-based thermoplastic elastomer may be added singly or in a suitable mixture of two or more kinds to the composition.

The composition may be dissolved in alcohol, alcohol / water or an organic solvent and applied on a base material such as paper or a transparent plastic film or a cellulose derivative to form an ink receiving layer. Examples of the transparent plastic film include polyethylene terephthalate, polypropylene, polyethylene, ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate copolymer, ethylene / methacrylic acid copolymer, ethylene / acrylic ester / maleic anhydride copolymer. There are polymers, nylon resins, polyvinyl chloride and the like, and there are cases where a surface-treated one for improving the adhesiveness or a biaxially stretched film for improving the transparency is used.

As a solvent for dissolving the above resin composition, methanol, methanol / water, n-propanol,
n-propanol / water, isopropanol, isopropanol / water, toluene, xylene, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, tetrahydrofuran, acetone, methyl ethyl ketone, cyclohexanone, ethyl acetate, butyl acetate, acetonitrile, dimethyl It may be appropriately selected and used from formamide and the like.

The thickness of the ink receiving layer is usually 1 to
The thickness is 200 μm, preferably 5 to 100 μm. 1 μm
If it is thinner, the ink absorbency will decrease, while 200μ
If it is thicker than m, not only the effect corresponding to it cannot be obtained, but also the translucency of the film may be deteriorated, which is not preferable. Further, generally used additives such as a fixing agent and a bleeding preventive agent may be appropriately blended.

Further, depending on the purpose, a small amount of heat stabilizers such as ultrafine silica, talc, zeolite, alumina, titanium oxide, etc., antioxidants, pigments and fillers can be added.

[0025]

EXAMPLES The present invention will be described in more detail with reference to production examples, examples and comparative examples, but the present invention is not limited to these examples. The test of the crosslinked polyalkylene oxide resin obtained in the production examples described below and the evaluation of the recording sheet printing performance using the resin composition for recording materials obtained in the examples were carried out by the following methods.

1. Test items of crosslinked polyalkylene oxide resin and method thereof (1) Water absorption capacity [g (pure water) / g (resin)]: Pure water 20
1 g of a crosslinked polyalkylene oxide resin was added to 0 ml, and the mixture was stirred for 24 hours and then filtered through a 200-mesh wire net, and the weight of the gel after filtration was taken as the water absorption capacity. (2) Melt viscosity [poise]: 170 ° C., 50 kg / c
Die 1mmφ × 1mmL Orifice (Shimadzu flow tester CFT-500C) under m ² load condition
It was measured at.

2. Evaluation Items of Printing Performance of Recording Sheet and Method (1) Drying Speed: Evaluation pattern (5 mmφ × 12 with a printer MJ-700V2C using software manufactured by Epson Corporation)
After printing (individual, black), a filter paper was rubbed against the printed surface at intervals of 10 seconds to measure the time at which the ink did not spread. (2) Printability: Printer M using Epson software
After printing the evaluation pattern with J-700V2C, one dot of each color was magnified 200 times with a microscope VH-5900 (manufactured by KEYENCE) and its diameter (μm) was measured. (3) Moisture and heat resistance: An evaluation pattern (broken line, red) was printed with a printer MJ-700V2C using software manufactured by Epson, and after 1 day, put in a thermo-hygrostat at a temperature of 50 ° C and a humidity of 80%, and taken out after 1 hour The state of the red broken line is 200
The bleeding state was measured by magnifying twice. The moist heat resistance evaluation criteria are as follows: ○: No bleeding △: Slight bleeding ×: Large bleeding (broken line looks like solid line) (4) Water resistance: Printer M using Epson software
Print the evaluation pattern with J-700V2C, and 5 days later
The state of discoloration was judged by immersing in water for a minute. The water resistance evaluation criteria are as follows: ◯: No color fading Δ: Slight color fading ×: Large color fading

Production Example 1 100 parts by weight of fully dehydrated polyethylene oxide having a weight average molecular weight of 20,000, 13.2 parts by weight of propylene oxide having a weight average molecular weight of 1,000, 1.97 parts by weight of 1,4-butanediol and 0.1 part of triethylenediamine. 2 parts by weight was placed in a storage tank A equipped with a stirrer, which was kept at 110 ° C., to obtain a uniform mixture under a nitrogen gas atmosphere. Separately, 9.01 parts by weight of 4,4′-diphenylmethane diisocyanate was placed in a storage tank B equipped with a stirrer and kept at 50 ° C., and stored under a nitrogen gas atmosphere. The mixture in storage tank A and the 4,4'-diphenylmethane diisocyanate in storage tank B were each 154 by a metering pump.
It was continuously fed to a twin-screw extruder set at 110 to 140 ° C at a rate of 6 g / min and 12.1 g / min, mixed and reacted in the extruder to take out a strand from the extruder outlet, and pelletized by a pelletizer. To obtain a crosslinked polyalkylene oxide resin. The water absorption capacity of the crosslinked polyalkylene oxide resin thus obtained was 20 g / g, and the melt viscosity was
(170 ° C. × 50 kg / cm ² ) was 20,000 poise.

Production Example 2 100 parts by weight of fully dehydrated polyethylene oxide having a weight average molecular weight of 50,000, 19.8 parts by weight of polypropylene oxide having a weight average molecular weight of 4000, 0.75 parts by weight of 1,4-butanediol, and 0.7 parts of triethylenediamine. 2 parts by weight and 350 parts by weight of toluene were placed in a reaction vessel equipped with a stirrer, which was kept at 110 ° C., to obtain a uniform mixed solution under a nitrogen gas atmosphere. Thereto, 3.62 parts by weight of 4,4'-diphenylmethane diisocyanate was added and reacted for 3 hours. After completion of the reaction, hexane was added and the mixture was cooled to room temperature to precipitate the produced resin. This slurry was filtered under pressure and dried under reduced pressure to obtain a crosslinked polyalkylene oxide resin. The water absorption capacity of the resin thus obtained is 14 g / g
And the melt viscosity (170 ° C., 50 kg / cm ² ) was 50,000 poise. This was dissolved in methanol / water (70/30 weight ratio) to obtain an alcohol / water solution containing 10% by weight of crosslinked polyalkylene oxide resin.

Example 1 Crosslinked polyalkylene oxide resin 1 obtained in Production Example 1
5 parts by weight of amorphous nylon [Tg: 125 ° C., crystallinity: 0%, trade name: Glibori G21, manufactured by EMS] 5
After mixing 0 part by weight and 50 parts by weight of copolymerized nylon [melting point: 134 ° C., crystallinity: 40%, trade name: Grylone CF62BS, manufactured by MUS] with a 20 L Henschel mixer, a 30 mm extruder (L / D) = 25, dullage screw, 170 ° C.) and pelletized, followed by inflation molding to obtain a film having a thickness of 80 μm.
The above performance evaluation was performed.

Example 2 Crosslinked polyalkylene oxide resin 1 obtained in Production Example 1
To 00 parts by weight, 30 parts by weight of copolymer nylon [melting point: 117 ° C., trade name: Vestamelt 171, manufactured by Daicel Hüls] and ethylene / vinyl alcohol copolymer [melting point: 1
83 ° C., trade name Eval F101, made by Kuraray] and 30 parts by weight were mixed with a 20 L Henschel mixer, and then strands were taken out with a 25 mm continuous kneader and pelletized with a pelletizer. The pellets and LDPE were coextruded and inflation-molded to obtain a two-layer film having an ink fixing layer having a thickness of 10 μm and an LDPE layer having a thickness of 90 μm, and the above performance evaluation was performed.

Example 3 Crosslinked polyalkylene oxide resin 1 obtained in Production Example 1
To 00 parts by weight, transparent nylon [crystallinity: 0%, T
g: 155 ° C., trade name: GRILLAMID TR55LY, manufactured by Ems, Inc.] 40 parts by weight and 12 nylon [Crystallinity: 30]
%, Melting point: 178 ° C., trade name: Grillamide L20, manufactured by Ems Co., Ltd.] 60 parts by weight were mixed with a 20 L Henschel mixer, and then a strand was taken out with a 30 mm extruder and pelletized with a pelletizer. This pellet and PP
Was subjected to co-extrusion and inflation molding to obtain a film having an ink fixing layer thickness of 10 μm and a PP supporting layer thickness of 50 μm, and the above performance evaluation was performed.

Example 4 Crosslinked polyalkylene oxide resin 1 obtained in Production Example 1
To 00 parts by weight, 40 parts by weight of copolymer nylon [melting point: 115 ° C., trade name: Gritex 1G, manufactured by Ems] and 8 nylon [melting point: 152 ° C., trade name: Fine Resin FR
-104, 60 parts by weight of Lead City Co., Ltd.] was mixed with a 20 L Henschel mixer, and then a strand was taken out with a 30 mm extruder and pelletized with a pelletizer. The pellets and an ethylene / acrylic acid ester / maleic anhydride terpolymer [melting point: 95 ° C., trade name: Bondine TX8030, manufactured by Sumitomo Chemical Co., Ltd.] used as a supporting layer are coextruded by a T die. A film having an ink fixing layer thickness of 50 μm and a supporting layer thickness of 100 μm was obtained, and the performance evaluation was performed.

Example 5 100 parts by weight of an alcohol / water solution containing 10% by weight of the crosslinked polyalkylene oxide resin obtained in Production Example 2 was added to a 20% methanol solution of 8 nylon [trade name: Toresin M-20, Teikoku]. Chemical Industry Co., Ltd.] 30 parts by weight with stirring, and coated on high quality paper (thickness: 80 μm) using a bar coater, and dried (perfect oven, 110 ° C. × 5 minutes) to a thickness of 5 μm. The ink fixing layer of No. 1 was obtained and the above performance evaluation was performed.

Example 6 The pellets obtained in Example 2 were charged with n-propanol / water (70/30 weight ratio) so that the solid concentration was 10% by weight, and dissolved at 88 ° C. for 3 hours. The obtained solution was applied to a PET film (thickness: 80 μm) using a bar coater, and then dried (perfect oven, 110 ° C. × 5 minutes) to obtain an ink fixing layer having a thickness of 5 μm. I went. In addition, the PET film thus obtained had sufficient transparency as an OHP sheet.

Example 7 Using the pellets obtained in Example 2, a film having a thickness of 60 μm was obtained by inflation molding, and the above performance evaluation was performed. The film thus obtained was excellent in transparency itself.

Comparative Example 1 The crosslinked polyalkylene oxide resin obtained in Production Example 1 was subjected to inflation molding with a 30 mm extruder (temperature: 170 ° C.) to obtain a film having a thickness of 100 μm, and the above performance evaluation was performed.

Comparative Example 2 A film having a thickness of 80 μm was obtained in the same manner as in Example 1 except that the crosslinked polyalkylene oxide resin was removed, and the above performance evaluation was performed.

Comparative Example 3 Using a commercially available OHP sheet (manufactured by Forex Co.),
The above performance evaluation was performed.

Comparative Example 4 The above performance evaluation was carried out using a commercially available ink jet sheet (Color BJ Transparency CF101, manufactured by Canon).

Comparative Example 5 Commercially available PPC paper super fine sheet (model number: MJ
The above performance evaluation was performed using SP1 manufactured by Epson Corporation. Table 1 summarizes the performance evaluation results of these Examples and Comparative Examples.

[0042]

[Table 1]

As is clear from this table, the resin composition for an ink jet recording material of the present invention has a high drying rate, a small dot diameter in printability, and excellent wet heat resistance and water resistance.

[0044]

EFFECT OF THE INVENTION The resin composition for ink jet recording material of the present invention is excellent in processability, particularly has a high ink absorption rate, is excellent in wet heat resistance, water resistance and transparency, and is an optimum recording material for water-based ink jet recording material. Will be provided.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyuki Ueyama, No. 1 Irifune-cho, Shirima-ku, Himeji-shi, Hyogo, Sumitomo Seika Chemicals Co., Ltd. 2nd Research Institute (72) Kenya Matsuda No. 1 Irifune-cho, Shiri-ku, Himeji-shi, Hyogo Sumitomo Seika Chemical Co., Ltd. Second Research Center

Claims (6)

[Claims] 1. A crosslinked polyalkylene oxide resin 20 to
A resin composition for an inkjet recording material, which comprises 95% by weight and a polyamide resin of 80 to 5% by weight. 2. Crosslinked polyalkylene oxide resin 20 to
A resin composition for an inkjet recording material, which comprises 95% by weight, 80 to 5% by weight of a polyamide resin, and 50% by weight or less of an ethylene / vinyl alcohol copolymer resin. 3. A cross-linked polyalkylene oxide resin is a resin obtained by cross-linking a polyalkylene oxide and a diol with an isocyanate compound, the temperature of which is 170 ° C. and 50 kg.
The melt viscosity under the load of / cm ² is 2000 to 200,000 poise, and the water absorption capacity (g pure water / g resin) is 10 to 45 g /
The resin composition for an inkjet recording material according to claim 1 or 2, which is g. 4. The polyalkylene oxide is at least one selected from the group consisting of polyethylene oxide having a weight average molecular weight of 500,000 to 500,000, polypropylene oxide, a mixture thereof and a copolymer thereof. Resin composition for inkjet recording material. 5. The polyamide resin is 8 nylon (alcohol-soluble nylon), 11 nylon, 12 nylon,
At least 1 selected from the group consisting of 6/66/12 copolymer nylon, amorphous nylon, and transparent nylon
The resin composition for an inkjet recording material according to claim 1 or 2, which is a seed and has a melting point or Tg of 70 to 190 ° C and a crystallinity of 50% or less. 6. The ethylene / vinyl alcohol copolymer resin has an ethylene content of 25 to 50 mol%, and a melting point of 1.
The resin composition for an inkjet recording material according to claim 2, which has a temperature of 90 ° C. or lower.