JPS61146591A - Ink jet recording medium - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (5) Industrial Application Field The present invention relates to a recording medium recorded using ink, and in particular, the density of images and characters recorded on the medium is high, and the absorbency and recording properties are high. This invention relates to an inkjet recording medium that is inferior in image storage stability.

(B) Prior art and its problems The inkjet recording method is a method in which minute droplets of ink are caused to fly and adhere to a recording medium such as a sheet of paper, thereby recording one image, one character, etc. But fast,
Features include low noise, easy multi-color printing, great flexibility in recording patterns, and no need for development or fixing.It is suitable for a variety of uses as a recording device for polar figures, including kanji, and color images. It is rapidly spreading in the world. The 1st #1 image in history created by a multi-color inkjet system! It is possible to obtain records that are comparable to multicolor printing using plate making or printing using color photography, and in applications where fewer copies are required, it is % cheaper than using photographic technology. For some reason, full color ll111#! It is being widely applied to the recording field.

Efforts have been made in terms of equipment and ink composition to use high-quality paper and coated At, which are commonly used for printing and writing, as the recording medium used in this inkjet recording method. However, as the performance of inkjet recording devices increases, such as higher speeds, finer apertures, and full-color inkjet recording devices, and their applications become more widespread, more advanced characteristics are required of recording media. Ta. In other words, for the recording medium, the ink dots have a high degree of m and one color tone is bright.
``The ink should be bright, the ink should be absorbed quickly, and even if ink dots overlap, there would be no ink flow or smearing, the lateral diffusion of the ink dots should not be unnecessarily large, and the surrounding should be smooth and not blurry. Furthermore, it is required that the resistance of the dye when the recorded image is exposed to ultraviolet rays, oxygen in the air, or water (1i) should not be reduced, but preferably should be increased.

Several proposals have been made to solve all of these problems. For example, JP-A No. 52-53012 discloses an inkjet recording paper made by temperature-controlled coating for surface treatment on low-size base paper, and JP-A No. 53-49.
No. 113 discloses an in-jet recording paper in which a sheet containing urea-formalin resin powder is impregnated with a water bathing polymer. These general paper type inkjet recording papers absorb ink quickly, but
The drawbacks are that the periphery of the dots tends to be blurred and the dot density is low.

Further, JP-A-55-5830 discloses an inkjet recording paper having an ink-absorbing layer on the surface of the support, and JP-A-55-51583 discloses a non-containing pigment as a pigment in the a-layer. An example using colloidal silica powder is disclosed, and furthermore, JP-A-55-11829 discloses an example of smear paper using a two-layer structure with different ink absorption speeds. These coated paper-type inkjet recording papers are improved over general paper-type inkjet paper in terms of dot diameter, dot shape, dot density, and color tone reproducibility, but it is difficult to apply them to these recording media. Many of the inks used are water-based inks that use water-bathable dyes, and if the image formed on the recording medium is exposed to water, the color will dissolve and ooze out again, reducing the value of the recorded material. -There are problems that need to be avoided.

Therefore, in order to improve this drawback, for example, JP-A-55
No. 53591 discloses an example of applying a water-soluble metal salt to the recording surface, and JP-A-56-84992 discloses an example of a recording medium containing a polycationic polymer electrolyte on the surface.
JP-A No. 55-150396 discloses a method of applying a water-resistant agent that forms a lake with the dye in the ink after inkjet recording, and *KOKAI No. 58-869 discloses a method of applying a water-resistant agent that forms a lake with the dye in the ink. A method of making the water-resistant recording sheet water resistant by making the water-soluble polymer gold unbathable after inkjet recording on a printing sheet has been disclosed.

However, these water-fastening methods had weak effects on water-fastness.9 The water-fastening agent caused some kind of reaction with the dye, reducing the shelf life of the dye. That was quite difficult.

Therefore, in order to improve the light resistance, for example,
-68303, 54-85804 and 56-1
No. 8151 discloses an example in which the entire ultraviolet absorber is added to the ink liquid. However, these ultraviolet absorbers have problems in that they reduce the jetting stability of the ink and have little effect when added in small amounts. Another solution is to use benzophenone thread towards the inkjet recording sheet.

It is disclosed in JP-A-57-74192 and JP-A-57-74193 that ultraviolet absorbers such as benzotriazole-based UV absorbers are included.
However, since it does not dissolve in large amounts in water, it is difficult to produce sufficient UV absorption effects, and when used in an emulsified form, the effect cannot be fully exerted due to the influence of the emulsifier. do not have.

(Q. Purpose of the invention 8A is to improve the inkjet suitability as described above, and to improve the water resistance and light resistance of water-based ink images, especially the original color resistance of water-based black dyes and/or water-based magenta dyes. The object of the present invention is to provide a recording medium with improved color fastness.

(Dl Structure and operation of the invention, namely 1) The present invention is an inkjet recording medium that forms a recorded image using a water-based ink containing a water bath dye, and the recording medium is an inkjet recording medium that contains a hindered amine compound. .

What is the hindered amine compound referred to in the present invention?

All compounds having one or more hindered amines in the molecule are represented by the following formula (1).

(In the formula, 5 is a hydrogen atom or an alkyl group of C1 to CB,
Refers to benzyl group, allyl group, acetyl group, etc.

Preferred is a hydrogen atom or a methyl group. R1, R2゜R5, "4U refers to lower alkyl group, carbonyl group, etc.,
Preferably it is a methyl group and/or an ethyl group. A is n
When = 1, -N)12. −0f(,=cn2.=
O.

-to, -0R1-OCO-circle-NHCH2aH2Cn2
0CH,.

NH-, -NH(C)12), -be he (1-1- to shim 2 bar).

(-) CH.

divalent global atom) indicates 1 grade. It is also important that A is a polymer.

Examples of hindered amine compounds represented by these general formulas include hindered amines that function as piperidine structures, such as 4-benzoyloxy-2,2゜6,6-titramethylpiperidine, bis-(2,2,6゜6-tetra Methyl-4-N-methylpiperidyl) sebacate, di(1,
2,2,6,6-bentamethyl-4-piperidyl) -
'2-n-butyl-2-(3゜5-di-t-butyl-4
-hydroxybenzyl) malonate, bis-(2,2,
6,6-tetramethyl-4-carbonyloxypiperidi/)-F-dimethylbenzyl, 2,2,4.4-tetramethyl-7-oxa-3,20-diaza-21-oxo-dispiro[5@ 1,9,19] heneicosan, bis-(2,2,6゜6-tetramethyl-4-piperidinyl) sebacate, dimethyl succinate, 2-(4-hydroxy-2,2,6,6-tetramethyl -1-piperidinyl) ethanol condensate and poly((6-(1,1,3
゜3-Tetramethylbutyl)imino)-1,3,5-triazine-2,4-diyl-(4-(2,2,6,6-
such as titramethylbiperidinyl)imino)-hexamethylene-(4-(2,2,6,6-titramethylbiperidinyl)imino). Among these, bis-(
2,2,6,6-tetramethyl-4-piperidyl)malonate, bis-(2,2,6,6-tetramethyl-4-
piperidyl) sebacate, bis-(2,2,6,6-tetramethyl-4-piperidyl) phthalate, 2,2.
6.6-tetramethyl-4-piperidylbenzoate,
4-amino-2,2°6.6-titramethyl-piperidine jl 2,2,6.6-tetramethyl-4-piperiditul and the like are preferably used. Furthermore, there is nothing wrong with using these hindered amine compounds together with a hindered phenol antioxidant, benzotriazole type or benzophenone type ultraviolet absorber. In order to apply it to a recording medium, it can be made into a salt of an organic acid or an inorganic acid, or
The bathing sex foundation 4 is big and emulsifying.

It is also possible to use it as it is by dissolving it in water or a suitable solvent at 1C. The content of Tit in the recording medium is 0.001 to 20 mmol/in terms of the number of hindered amine groups.
rr? , preferably 0.005 to 10 mmol/W? It is.

In the present invention, as a method for producing a recording medium containing the hindered amine compound, - Pulp fJ & fibers are disintegrated to form a slurry and used as a paper wall? When leaving behind.

A method of stirring or applying a glass-filling liquid in which a hindered amine compound is dissolved or dispersed using a suitable machine such as a size press device installed in the middle of the process.

Furthermore, there is a method of forming an ink-receiving layer containing a hindered amine compound on a suitable support by applying a coating solution containing a hindered amine compound to an ink-absorbing pigment and an ink-receiving layer by applying 5 ΔF using a tl-containing coating device. There is a method in which a hindered amine compound dissolved or dispersed is dropped onto an ink-receiving layer made of a detergent or the like. In this case, it is also possible to use commonly used fillers, pigments, adhesives and other additives. Also, if it is necessary to impart water resistance to one image.

It is also possible to use a cationic resin, and in the present invention, in order to achieve water resistance and light resistance at the same time, it is preferable to use them in combination.

Examples of fillers or pigments that can be used once again in the present invention include light negative carbon modified calcium, waidada rehydrated calcium, kaolin, Merck, calcium sulfate, barium sulfate, titanium oxide, zinc oxide, zinc sulfide, zinc carbonate, and satin white. Examples of white pigments and organic pigments include styrene glass pigments, acrylic glass pigments, There are microcapsules, urinary resins, etc. In these plain wood inventions, synthetic amorphous silica and aluminum hydroxide are preferably used.

The cationic resin used in the present invention refers to monomers, oligomers, or polymers that dissociate and exhibit cationic properties when exposed to water, preferably having a quaternary ammonium group, particularly preferably the following (IJ ～(Refers to a compound having a horizontal structure represented by the general formula (■).

In the formula, 11j 1(+2, kLs is an alkyl group, m
[l~7゜n is 2~10. Y represents an acid group.

In the formulas (If) to (Foundation), R1 and 几2 are -Cf(,, -C
H2-C)1. .

-CH2-CH2-01-1, Y is +1#! Represents the fund.

(V) Polyalkylenepolyamine dicyandiamide ammonium term condensate Compound v represented by general formula (1) has 1 e.g.
-607 (manufactured by Nalco Chemical Co., Ltd.) and Polyfix 601 (manufactured by Showa Kobunshi Co., Ltd.).

The compounds represented by general formulas (If) to (trans) are polydiallylamine derivatives, which are obtained by cyclization polymerization of diallylamine compounds, and include Percoll 1697 (Allied Colloid Co., Ltd.) and Cat Floc (Calgon Corp).
.

Examples include PA8 (manufactured by Nichizuka Yokisha), Neofix I (manufactured by Nichika Kagakusha).

An example of the compound represented by the general formula (■) is Neofix RP-70 (Nicca Chemical Co., Ltd.) t'.

The cationic tree represented by these general formulas (1) to (V) contains Umt0.1 to 4 f/rn', good'
! L<n 0.2-2 f/WI.

What are the antitumor agents that can be used for one more time according to the present invention? LJ Eha.

Saponified vI powder, etherified! Cellulose such as 4 powder, carboxymethyl cellulose, hydroxyethyl cellulose, etc.
Specialty casei/, gelatin, soy protein.

Polyvinyl alcohol and its trsd form, anhydrous maleic rjl! Tree m1. Conjugated diene polymer latex, such as styrene-butadiene co-M&K, methyl methacrylate-butadiene co-electropolymer, acrylic sub-polymer latex, such as electrolyte or co-electrolyte of acrylic ester and methacrylic acid ester, ethylene Vinyl acetate
MtI polymers such as vinyl-based electropolymer latex such as resin, or carboxyl groups of various polymers thereof. i, aqueous adhesion agents such as modified/casting combined latex, melamine resin, heat 1 silica synthetic resin system of urinary column 1 grade, polymethyl methacrylate, polyurethane resin,
Unsaturated polyester @ fat, TLS vinyl-17p acid vinyl copolymer.

Synthetic resin adhesives such as polyvinyl butyral and alkyd alba may be used alone or in combination. These agents are used in amounts of 2 to 120 parts, preferably 5 to 50 parts, per 100 volumes of Kenka, but the ratio is particularly limited if the award is light enough to be included in the book of Tenka. It's not a thing. However, if more than 120 parts of the drug is used, the drug will form a film, reduce the formation of voids, and make the voids as small as possible, which is not preferable.

Other additives include dispersants and thickeners.

#L Mobility modifier, antifoaming agent, foam inhibitor, mold release agent 1 Foaming agent.

′? & transparent agent 1 colored dye, -yte, mineral additive, fluorescent brightening agent,
Ultraviolet absorbers, antioxidants, preservatives, anti-piping agents, waterproofing agents, etc. can all be added as appropriate.

As the support, a sheet material such as paper or a thermoplastic resin film is used. In the case of paper, it should be paper with no sizing agent added or paper with appropriate sizing, and it does not need to contain fillers or fillers.

Also, polyester for thermoplastic films.

Transparent films of polystyrene, polycyclized vinyl, polymethyl methacrylate, CNW cellulose, polyethylene, polycarbonate, as well as white opaque films of the white family, filled or foamed, are used. As a white silk material to be filled.

For example, titanium carbide, calcium sulfate, calcium ash,
Many things such as silica-clay, Merck, zinc oxide, etc.
! l! used.

In addition, laminated paper made of a sheet of paper laminated with a film made of resin can also be used as a toilet opening. In order to improve the contact between the surface of the resin and the ink receiving layer 1, a primer layer or a corona release layer may be applied.

A sheet simply grown on a support can be conveniently used as a ball distribution sheet according to the present invention, such as 75i and 9+.
It is also possible to impart surface smoothness by passing between roll nips under heat and/or pressure using M super calender, cross calender, etc.

In this case, excessive processing by super-kander processing will reduce the ink absorbency due to the voids between the particles that have been formed, so the use of the knife-throwing process may be of limited use.

The water-based ink referred to in the present invention includes the following layer coloring agent and liquid medium,
A recording liquid consisting of other additives.

As the coloring agent, water-disintegrable dyes such as acrylic dyes, acid dyes, basic dyes-reactive dyes, and dyes for negative products are preferably used.

For example, as a direct dye, C, 1, 1) direct Black 2.49.11
．． 14117.19.22.27°32, 36.38.
41.4 & 49.51.56゜62, 71.74.7
5.77, 7 & 80.105, 106.107.10
8.11th 113.117, 132.14a 1541
94 C, 1, Direct Yellow, 2, 4.8
．． 11.12.24.26.27°28, 33.34.
39.41.42.44.48°50, 51.58.7
2.85.86.87.88°98, 100.110 C01, Direct Orange 6. & 1
0.26.29.39.41.49.51.102 C, 1, Direct Red i, 2.4.
B, 9.11. i 17.20.23.24 2
8,31,33,37,39,44゜46.47,48
, 51, 59, 62.6 formula 73° 75, 77, 80.
81.83. 84. 85. 90°94.99.
101. 108. 110,145°189.19
7,220,224,225,226°227.230 C,1,1) direct Violet 1.7.9
．． 12.35.48.51.90.94C,1,Dir
ect Blue 1.2.6.8.15.2&
25.34.69°70,7L 72.75.76,7
8.8G, 81°82.83, 86.90.9&
106.10&Ho, 12o, 12:(,15&1
6 & 1es.

192.193,194,195,196,199゜2
00.201, 204203, 207, 218°236
．． 237,239,246,258C,I,Direc
t Green 1.6.8.28.33.37.6
3.64C,I, Direct Braun IA,
2.6.25.27.44.511L 95°100
．． 101, 106, 112, 173, 194°195.
209,210,211 As an acid dye, C,1,Acld Black 1.2.7.16.
17.24.26.2&31゜41,4&6 to 545
0.6 turtle 94, 107° 109; 112.11 & 1
19.121.12λ131.15 to 156 C, 1, Ac1d Yellow 1.3.4.7.
tl, I2113.1417゜1 & 19.125
．． 29.34.3 & 38°40, 41.42.44.
49.5 & 5 turtle 59°61, 71.72.76, 78
．． 99.111゜11411&122.135.16
1.172°C, 1, Ac1d Orange 7.
& la 33.56.64C, 1, Ac1d Re
d1.4. a & 1 & 1411bllL1
9゜21, 2a 27.30.3213435.37゜4G, 42151.52.54.5? , 80.8s83, 85.87.8 & 89.92.94.97゜1
0a l0IL 110.115.119.129゜1
31, 133.13413 to 154155°172, 1
76, 180.184.186.187°24 & 24
9.254.25 to 260.289°317.31 & C, 1, Ac1d Violet 7. IL 15
．． 34.35.41.4 & 49°75°C, 1, Ac1d Blue 1.7.9.22.
23.25.27.29.40゜41.43.45,4
9,51.53,5 56°59.62,78,80,
81, 83, 90, 9th 93, IOL 104 11
1,113,117゜120.124126,145,
167.171゜175.18 & 229.23423
6C, 1, Ac1d Green 3.12+ 1
9.27.41.9.16.20.25C,1,Ac1
d Braun 4.14 Basic dyes include C,1,Ba5ic Black & gC,1,B
a5ic Yellow 1. & 11. IL 1
421.3236C,1,Ba5ic Orange
2.15.2L 22C, 1, Ba5ic Red
1.2.9.1L13.37C,1,Ba5ic V
iolet 1.317.10.14C,1,Ba5
ic Blue 1.3.5.7.9.2425.2
6.213.29C,1,Ba5ic Green
1.4C,1,Ba5ic Braun 1.12 as a reactive dye.

C, 1, Reactive Black L turtle 5. a
& 1214C01, Reactive Yellow
w 1.2.3.13.14.15.17C,1,Re
active Orange 2.5.7.16.20
．． 24C, I, Reactive eda7. ILIS 15.1? , 21.2 & 24, 35.3 & 42.6
3.66 C01, active Violet 2.4.5
．． 8.9C, 1, Reactive Blue 2.5
．． 7.12+ 13.14.15.1? .

18, 19.20.21.25.27.2 turtle 37, 3 &
40.41.71 C, 1, Reactive Green 5.7°C01
, Reactive Braun 1.7.16 Furthermore, food colorants include C, 1, Food Black 2 C, 1, Food Yellow 3.4.5C0I
, Food R, ed Su3.7.9.14.52
．． 87.9λ94102, 104.105.106 C, 1, P'ood Violet 2C, 1, Fo
od Blue L 2C, 1, Food Gre
en 2.3, etc.

The liquid medium for the aqueous ink includes water and water-soluble organic solvents such as methyl alcohol, ethyl alcohol, n-7' propyl alcohol, isobutyl alcohol, and 1m-7'' methyl alcohol.

Alkyl alcohols having 1 to 4 carbon atoms such as 5ec-7" alcohol, tert-7" alcohol and isobutyl alcohol; Amide alcohols such as dimethylformamide and dimethylacetamide; Ketones or ketone alcohols such as acetone and diacetone alcohol ; Ethers such as tetrahydrofuran and dioxane; Polyalkynone glycols such as polyethylene glycol and polyglopylene glycol; Ethylene glycol-globylene glycol.

Butylene glycol, triethylene glycol.

1.2.6-hexandriol, thiodiglycol-
Alkylene glycols with 2 to 6 alkylene groups such as hexylene glycol and diethylene glycol; polyhydric alcohols such as glycerin, ethylene glycol methyl ether, diethylene glycol methyl (or ethyl) ether, and triethylene glycol monomethyl ether; Examples include lower alkyl ethers.

Among many of these water-soluble organic solvents, preferred are polyhydric alcohols such as diethylene glycol, and lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl ether and triethylene glycol monoethyl ether.

Examples of other additives include PH regulators, sequestering agents, antifungal agents, viscosity modifiers, surface tension modifiers, wetting agents,
Examples include surfactants and rust preventives.

According to the present invention, when an aqueous ink containing a water-soluble dye is used to record on a recording medium containing a hindered amine compound, the light resistance of the image is improved. Although the cause of salt release is not certain, it is thought that the fading or discoloration of dyes is caused by radicals generated on dye molecules by ultraviolet rays, etc. Hindered amine compounds trap and stabilize these generated radicals, so dyes are It is thought that the decomposition of is suppressed.

Inkjet suitability was measured by the following method.

Light resistance is Canon inkjet glitter (A-1
210) using a xenon fade meter (manufactured by Suga Testimonial Co., Ltd., FAI.

-25X-) ICI4) at 40℃, 60%, illuminance 6゜w
/m' for 40 hours, and the color of the plate before irradiation was measured with a Macbeth densitometer 1 (D514), and the percentage of the color density after irradiation divided by the degree before irradiation was calculated. Lightfastness (
It was shown as remaining 4). Further, discoloration and fading were visually determined by measuring the degree of red change of the black printed area at this time.

Water resistance was determined using the same Canon inkjet printer by printing a solid image with %C, JY, and Bk inks, immersing the image area in running water at 30°C for 3 minutes, and measuring the density before and after immersion using a Macbeth densitometer. It was measured with RD514, and the percentage obtained by dividing the immersion temperature by the concentration before immersion was taken as the water resistance value. The higher the value, the better the water resistance.

To measure the ink absorption speed, use a Sharp or Canon inkjet printer, feed the paper immediately after solid printing of red (magenta + yellow) (about 1 second later), and contact it with a paper presser roll or your finger. Judgment was made based on whether dirt appeared or not.

@Example The present invention will be described below with reference to Examples, but the invention is not limited to these examples. In the embodiments, parts and parts 1 and 1 refer to parts 1 and 1.

Example 1 Reactor water level 350 dcsf OLBKP 70 parts and door water level 40
0 td csf 0NBKP Pulp slurry consisting of 30 parts, 18 parts of ground calcium carbonate - 1 part of cation powder
1 part and 0.01 part of an anionic polymeric yield improvement agent were added and the basis weight was 68? paper was made. Using a size press installed in the middle of the paper machine, 3 parts of polyvinyl alcohol (MPVA117, manufactured by Kuraray Co., Ltd.) and 2 parts of a cationic resin (Neofix RIF-70, manufactured by Nicca Chemical Co., Ltd.) were added.
and a hindered amine compound having the following structural formula: 0.2
Club meeting vinegar l! ! A size press liquid dissolved in 94.8 parts of water containing water was applied at 60 f/d, dried, and finished by a conventional method to obtain the recording paper of Example 1. The inkjet suitability of this recording paper was measured and the results are shown in Table 1.

Comparative Example 1 A recording sheet of Comparative Example 1 was obtained in exactly the same manner as in Example 1, except that the hindered amine compound was removed from the size press liquid used in Example 1. Table 1 shows the results of measuring the inkjet suitability of this recording paper.

Example 2 LBKP 80 parts of F Fisheries 370 dcsf, P water content 400
Slurry consisting of 20 parts of NBKP of dcsf, 13 parts of solid calcium carbonate, 1 part of cationic powder, alkyl ketene dimer sizing agent (manufactured by Deitsku Haki≧Less Co., Ltd., Burcon W) o, os parts, and 0.4 parts of polyalkylene polyamine epichlorohydrin resin. From the fourdrinier paper machine
8 f/rr? During paper making, oxidized starch was added to the solids at a rate of 2 t/rr? using a size press machine. A coated base paper was produced by adhering the coated base paper.

The Steckigt size degree of this base paper was 21 seconds.

Synthetic silica (manufactured by Mizusawa Chemical Co., Ltd., Mizukasil P) is used as a coating liquid.
-73) Prepare a liquid with a solid content of 18% consisting of 100 parts, 20 parts of polyvinyl alcohol (manufactured by Kuraray Co., Ltd., PVA117), and a small amount of antifoaming agent, and coat the coated base paper with an air knife coater to give a solid content of 11 t/rrl. A paste paper with an ink-receiving layer was prepared by coating and drying the paste so that the ink-receiving layer was obtained.

Separately, a solution prepared by dissolving 1 part of a hindered amine compound having the following structural formula in 99 parts of water (bis-(1,2,2,6,6-bentamethyl-4-piperidyl) sebacate) containing total acetic acid was added to the paste paper. 0.2f/r with solid content on the surface? The coating was coated and dried, and then finished by being lightly supercalendered to obtain the recording paper of Example 2.

Table 1 shows the results of all inkjet suitability measurements for this recording paper.

Comparative Example 2 A recording sheet of Comparative Example 2 was prepared in exactly the same manner as in Example 2, except that a liquid containing only a solvent and not containing the gt-hindered amine compound used in Example 2 was used. Table 1 shows the results of measuring the inkjet suitability of this recording paper.

Examples 3 to 8 100 parts of synthetic silica (manufactured by Tokuyama Soda Co., Ltd. - Fine Seal X-37), polyvinyl alcohol fi'</
7V company's JL PVA117) 20i, fJf onic resin (Polyfix 601 manufactured by Showa Kobunshi Co., Ltd.) 7 parts, having the following structural formula (bis-(2,2,6,6,-tetramethyl-4-piperidyl) phthalate) hindered amine compounds each 0
．． 1.0.5.1.2゜6 coating solutions with a solid content of 18% consisting of 4.8 parts and a small amount of antifoaming agent were prepared, and each was coated on the same coated paper used in Example 2 using an air knife coater. Example 3.4.5.6゜7.8 with an ink-receiving layer containing a hindered amine compound by drying on a fallen cloth so that the solid content is 1.4 fall♀ and applying @< super calendering. It was used as a recording paper. Table 1 shows the results of measuring the inkjet suitability of these recording papers.

Comparative Example 3 A recording sheet of Comparative Example 3 was prepared in exactly the same manner as in Example 3, except that the hindered amine compound was removed from the coating liquid used in Example 3. Table 1 shows the results of measuring the inkjet suitability of this recording paper.

Table 1 (g) Effects of the Invention As is clear from Table 1, in Examples 1 to 8 containing the hindered amine compound according to the present invention in the recording medium, there was no discoloration or fading of the black ink image compared to the comparative example. It is recognized that the light fastness of black ink images and magenta ink images shows a highly questionable improvement effect.

Claims (1)

[Claims] An inkjet recording medium in which a recorded image is formed using an aqueous ink containing a water-bathable dye, characterized in that the recording medium contains a hindered amine compound.