JPS63307979A - Ink jet recording sheet - Google Patents

Abstract

PURPOSE:To obtain an ink jet recording sheet for high image quality free of flow-out or blurring of an ink, by providing a layer comprising a hydrophilic polymer mordant and a vinyl polymer having at least one of a-COOM group and an-SO3M on a base. CONSTITUTION:A hydrophilic polymer mordant is a polymer containing a tertiary amino group, a polymer having a nitrogen-containing, heterocyclic moiety, a polymer containing a quaternary caticoic group or the like, and is preferably used in combination with other hydrophilic polymer. In addition, a homopolymer of a vinyl monomer having at least one of-COOM or-SO3M (wherein M is hydrogen or an alkali metal) or a copolymer thereof (a copolymer of at least two such vinyl monomers or a copolymer of the vinyl monomer with other monomer) is used. Particularly, a polymer (inclusive of homopolymer and copolymer) comprising the repeating unit of formula 1 is preferably used.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an inkjet recording sheet, and particularly to an inkjet recording sheet that can perform inkjet recording using aqueous ink at high speed and with good sharpness.

(Prior Art and Its Disadvantages) Inkjet recording is noiseless and enables high-speed recording, and plain paper can be used for recording, so it has been adopted in terminal printers and has rapidly become popular in recent years. Furthermore, by using a large number of ink nozzles, it is easy to perform multicolor recording, and multicolor inkjet recording using various inkjet recording methods is being considered.

Inkjet recording sheets used for inkjet recording include high-quality paper, continuous slip paper, art paper, coated paper,
Paper made with low density without saturating the sizing agent, JP-A-32-
330/, No. 2, JP-A No. 52-7≠3≠0, JP-A No. 3
3- Inkjet recording paper with relatively good ink absorption and less ink spreading as described in Hiroshi No. 773, cloth, plastic film with an ink-absorbing surface, wooden boards, metal plates, etc. It is.

Inkjet recording is generally performed on these inkjet recording sheets using water-based ink. The water-based ink for inkjet recording is JP-A-Sho ≠ Tar♂ri 3.
No. 34, JP-A Sho-Hirota No. 276λθ, JP-A Sho-I Hiroshi 360d, JP-A Sho-J O-10.2≠07 1% Kai-Shoj
/-727310, JP-A-31-/37!01. issue,
JP-A-J/-137303, JP-A-J/-//J! 7
No. 06, JP-A Sho J/-/3 Rihiro θr, JP-A Sho jλ-/
-00g issue, Tokukai Akira! λ-i, zoori issue, Japanese Patent Application Publication No. 1983
-7.2070, JP-A-3! -7≠aOtsugo, Tokukoshojλ-/Hiroshi6hiro3, Tokukosho! ,! -/Hiroshi6<z+ issue,
Japanese Patent Publication No. 33-77707. No., JP-A-33-//10
No. 7, Tokuko Sho! 3-.
As described in No. 201#2, etc., it consists of a water-soluble dye, a wetting agent, a dye solubilizer, a fungicide, water, a water-miscible organic solvent, and the like. Here, as water-soluble dyes, direct dyes, acid dyes, and basic dyes are used.

As mentioned above, inkjet recording performed using conventionally known water-based inks on conventionally known inkjet recording sheets takes time to absorb the ink,
The disadvantage was that the dye records were blurred and the sharpness was poor.

Furthermore, in the case of multicolor inkjet recording, ink is ejected from two or more nozzles, and two or more dots often overlap at seven points on the paper, and even bright-colored ink dots overlap at the same location. be. If the ink droplets are not quickly absorbed into the paper layer, the ink will overlap with the next ink droplet ejected at the same point on the paper, flow out, or scatter, staining the white background area. Furthermore, the paper surface may be rubbed and stained due to handling after recording.

Therefore, for multicolor recording, a recording paper with particularly good ink absorbency is required.

However, in a recording paper having good ink absorption properties, ink dots generally not only spread laterally but also have large penetration in the thickness direction. For example, paper that is made as bulky as possible without the addition of sizing agents has very good ink absorption and has enough ink absorption to withstand multicolor inkjet recording, but the lateral spread of ink dots is large and the resolution is poor. becomes defective,
The Maku ink penetrates deeply into the thickness of the paper! However, the density is low due to the scattering of the sky due to the voids in the paper (it becomes a whitish color and it is not possible to obtain clear Ryotsu. Also, on paper with good ink absorption, cyan, magenta, yellow, When black black recording is performed, the previously ejected ink penetrates deeply into the paper layer, making it difficult to see one color from above, resulting in poor color reproducibility.

In this way, the key to achieving good density, resolution, and color reproducibility in multicolor inkjet recording is that the coloring components in the ink have little horizontal spread on the recording paper used, and the thickness of the coloring components in the ink is small. These contradictory properties are required: less permeation in the transverse direction, the coloring component being present as much as possible on the surface of the paper layer, and good ink absorption.

In order to solve this problem, several proposals have been made in the past. For example, 1% Kokai No. 32-330/- discloses an inkjet recording paper in which a paint is coated on a low-size base paper and the paint penetrates into the paper layer. Furthermore, Japanese Patent Application Laid-Open No. 1983-773 discloses an inkjet recording paper in which paper to which fine powder of urea-formalin resin is added is impregnated with a water-soluble polymer. Further, in No. 3.2-7≠3≠O of 1987, an inkjet recording paper having a specific air permeability and ink absorption time is disclosed.

However, the technical ideas found in these inkjet recording papers all aim to improve resolution, clarity, etc. at the expense of ink absorption, and as a result, resolution and density are improved to some extent. However, the ink absorbency is reduced, making it unsatisfactory as a multicolor inkjet recording paper. f-th Tokukai Shoj Zaichi 2μ≠
No. 23 discloses an inkjet recording material in which a substrate containing gold, a superabsorbent resin, is coated with a dye-adsorbing polymer binder as a main ingredient.

However, in this case as well, since the ink is rapidly absorbed into the superabsorbent resin layer, it is not adsorbed by the polymer adsorbent and soaks into the substrate, resulting in insufficient resolution and density. Therefore, when performing multicolor inkjet recording, there is a demand for a next recording sheet that has the above-mentioned characteristics. In particular, a recording sheet that has these properties and can be used as a color transveer array, or a recording sheet coated or laminated with a water-impermeable polymer and using a paper support, has not been considered at all.

A first object of the present invention is to provide an inkjet recording sheet that does not cause ink to run out or bleed during inkjet recording.

A second object of the invention is to provide an inkjet recording sheet that provides high quality inkjet recording with high image density, good elubility and color reproducibility.

A third object of the present invention is to provide an inkjet recording sheet that has the above-mentioned characteristic 1 and can be used as a color transbearing range.

A fourth object of the present invention is to provide an inkjet recording sheet having excellent gloss and having the ink receiving side coated or laminated on one or both sides with a water-impermeable polymer having the above characteristics. It is.

(Structure of the Invention) An object of the present invention is to provide an inkjet recording sheet on which a recorded image is formed by jetting a water-based ink containing a water-soluble dye, the sheet having at least a hydrophilic polymer mordant and -COOM group is -S as a repeating unit
This was achieved by an inkjet recording sheet characterized by having a layer containing a polymer containing a vinyl monomer unit with at least one O3M group being gold.

-COOM as a hydrophilic polymer mordant and repeating unit
The polymer containing one vinyl nitride unit having at least one of the group and the 803M group may be contained in the same layer or may be in a separate layer.

Moreover, it may consist of three or more layers.

Since the inkjet recording sheet of the present invention uses a hydrophilic polymer mordant and the above-mentioned patented polymer, it can quickly absorb water-based ink and form images with little bleeding and high resolution. All of these components are provided as a layer on the base (support), making it possible to make the support completely transparent, with excellent transparency in non-image areas, and clear color transform of the image. can be obtained. Furthermore, a reflective inkjet recording paper with excellent gloss and color density can be obtained by using a support coated or laminated on one or both sides with a water-impermeable polymer.

The hydrophilic polymer mordants used in the present invention include polymers containing tertiary mino groups, polymers containing nitrogen-containing heterocyclic moieties, and polymers containing these quaternary cation groups, and preferably other hydrophilic polymer mordants. It is used by mixing with a synthetic polymer (gelatin, etc.).

For polymers containing vinyl monomer units having tertiary amino groups, see JP-A-Shobo-t, obψ No. 3, 60-
Specific examples of polymers containing vinyl monomer units having tertiary imidazole groups include JP-A-60-//ll34! No. 1sO-/2
No. 291A/, U.S. Patent No.≠, λgλ, No. 303, Hiroshi U.S. Patent No. //j, No. 2≠, No. 3. /'A1.01. / No. 0, Japanese Patent Application No. 6/-7/I/, etc.

Preferred specific examples of polymers containing vinyl monomer units having quaternary imidanium salts include British Patent No. 1, 0
No. 36,707, No. 2,073゜04LI, No. 1
．． ! ? ≠, ri No. 61, U.S. Patent No. Hiroshi, /, 2≠, 3g6
No., same No. ≠, /ノ! ,/2μ issue, same issue≠, 273, Za33 issue, same issue≠, ≠jQ2.2λ≠ issue, JP-A-Sho≠r-2
It is described in No. 1, 2λj, etc.

Other preferred specific examples of polymers containing vinyl monomer units having quaternary ammonium salts include U.S. Pat.
Same 3rd. Rijza, No. 99j, JP-A No. 60-37g36, Bo-6ot Kou No. 3, No. 1pO-/22-11tO
No. 1,0-/2λ Rihiro/No. 60-λ33/34
is written in the number etc.

The molecular weight of the polymer mordant is /, 000~/, Ooo,
ooo, especially 10.000 to ioo, o.

Q is preferred.

Specific examples of hydrophilic polymer mordants that can be used in the present invention are shown below. The number of 7 units represents molti t (the same applies hereinafter).

A) CH3 C) J) L) CH2-C)12-(JH and H2-(;tJ21.;H21,;1+- and H2(J
HQ) The remer mordant is mixed with a binder such as gelatin and coated on a support to form a layer.

The hydrophilic colloid used as the binder is preferably a hydrophilic organic polymer compound, and may be a commonly used hydrophilic natural compound, but preferably gelatin, gela derivatives, or cellulose derivatives. Examples include proteins such as, natural polyvinylpyrrolidone such as polyvinylpyrrolidone such as chin and gum arabic, and water-soluble polyvinyl compounds such as acrylamide.

Gelatin or gelatin derivatives are also preferred.

In addition to lime-treated gelatin, acid-treated gelatin and the Journal of the Photographic Society of Japan (Bull, Soc.

Phot, Japan), /16/A, page 30 (l
Enzyme-treated gelatin, gelatin hydrolysates, and enzymatically decomposed products as described in 66) can also be used. Examples of gelatin derivatives include gelatin with acid halides,
Acid anhydrides, incyanates, bromo vinegar19. Products obtained by reacting various compounds such as alkanesultones, vinyl sulfonamides, maleimides, polyalkylene oxides, and epoxy compounds, gelatin, acrylic acid, methacrylic acid, their esters, amides, etc. A single or copolymer of vinyl tertiary polymers such as derivatives of azilonitrile, styrene, etc. can be used.

The mixing ratio of the polymer mordant and the binder such as gelatin, and the amount of the polymer mordant to be applied can be determined easily by those skilled in the art, depending on the amount of dye to be mordant, the type and composition of the polymer mordant, and the scar formation process to be used. However, the ratio of mordant/binder such as gelatin is 2o/0.
~IO/J 0 (weight ratio), mordant application amount is 0.2 ~
/if/m” is appropriate, preferably 0031-19
It is preferable to use it at 7 m”.

In the present invention, -CO (JM or -SO3M (where M
contains at least one hydrogen atom or an alkali metal f)
Homopolymers and copolymers (copolymers of two or more vinyl monomers or copolymers with other monomers) of vinyl monomers are used.

In particular, a polymer (including a homopolymer and a copolymer) containing a repeating unit represented by the following formula (11) is preferably used.

In the formula, 1 represents a hydrogen atom, an alkyl group having 7 to 6 carbon atoms, a chlorine atom, or 100 (JM), and R2 represents a hydrogen atom, an alkyl group having 7 to 6 carbon atoms, or a chlorine atom. represents, Xl, )(2 is -C(J(J-1-C(JNR3
, represents an f-order Fi-substituted or unsubstituted phenylene group, f
(However, R3 represents a hydrogen atom or a substituted or unsubstituted alkyl group.) Yl, Y2
, Zl, Zl represent a divalent linking group, preferably a substituted or unsubstituted alkyl group, aralkylene group, phenylene group, -R' COO-1-R, 5UCO-1-R
'CIC0R7-CO(,l-1几9 R8-to-1 or -R,10g-full list (however,
几4, 几5. B6, 几7, R8, R9 and BIO are substituted or unsubstituted alkylene groups,
(represents an aralkylene group). D is −(−R”+CO(J
M-→Bll9-803M, E is a hydrogen atom, +
R, "-)-, C00M or ÷Bll sweet SO3M, f
(However, M represents a hydrogen atom f or an alkali metal,
Bll represents all substituted or unsubstituted alkylene groups, phenylene groups, and aralkylene groups. a, b are 0 or /
full display). 2, m, p, qFio or l;
0% r represents an integer from θ to 3o.

The above R3, R4, H,5, 几6, R7, R8, R9,
10. As a substituent for R11, an aryl group (
For example, phenyl group), nido a group, hydroxyl group/cyano group, sulfo group, alkoxy group (e.g. methoxy group), aryloxy group (e.g. phenoxy group), acyloxy group (e.g. acetoxy group), 7-syl amino group (e.g. Ryocetyl gamma group), sulfonamide group (e.g. methanesulfonamide group), sulfamoyl group (e.g. methylsulfamoyl group), halogen atom, carboxy group, carbamoyl group (e.g. methylcarbamoyl group), alkoxycarbonyl group (e.g. methoxycarbonyl group), sulfonyl group (for example, methanesulfonyl group), and when there are two or more substituents, they may be the same or different.

In the present invention, polymers (including homopolymers and copolymers) containing repeating units represented by formula (II) or (summer) are particularly preferred.

I Here, Bl, Xi, R11, M, A, and a have the same meanings as above.

The polymer used in the present invention may be a homopolymer of the above repeating units, a copolymer of d or more repeating units, or a copolymer with other monomers. good.

Other monomers for forming the copolymer include, for example, acrylic esters, methacrylic esters, crotonic esters, vinyl esters, maleic acid diesters, acrylamides, methacrylamides, vinyl ethers, and styrenes.

Examples include unsaturated nitriles.

In addition, saponified copolymers obtained from these seven polymers can also be used as the polymer of the present invention.

More specific examples of these monomers include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, imbutyl acrylate, tert-pure acrylate, hexyl acrylate, and λ-ethyl acrylate. Hexyl acrylate, acetoxyethyl acrylate, phenyl acrylate, λ-
Methoxy acrylate! -ethoxy acrylate, λ
-(2-methoxyethoxy)ethyl acrylate and the like. methacrylic acid ester; C is methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, tert-butyl methacrylate, cyclohexyl methacrylate;
Examples include 2-hydroxyethyl methacrylate and λ-ethoxyethyl methacrylate. Examples of Nisdel crotonate include butyl crotonate, hexyl crotonate, and the like. Examples of the vinyl ester include vinyl acetate, vinyl propionate, vinyl butyrate, vinyl methoxy acetate, vinyl benzoate, and the like.

Examples of maleic acid diesters include diethyl maleate, dimethyl maleate, diptyl maleate, and the like. Examples of the 7-maric acid diesters include diethyl fumarate, dimethyl fumarate, diptyl fumarate, and the like. Examples of itaconic acid diesters include diethyl itaconate, diethyl itaconate, and dibutyl itaconate. Acrylamide is an acrylamide.

Methylacrylamide, ethyl acrylamide, propylacrylamide, n-butylacrylamide, te
Examples include rt-butylacrylamide, cyclohexylacrylamide, 2-methoxyethylacrylamide, dimethylacrylamide, dimethylacrylamide, and phenyl acrylamide. Examples of methacrylamide include methylmethacrylamide, ethylmethacrylamide, n-butylmethacrylamide, tert-butylmethacrylamide, 2-methoxymethacrylamide, dimethylmethacrylamide, diethylmethacrylamide, and the like. Examples of vinyl ethers include methyl vinyl ether, butyl vinyl ether, hexyl vinyl ether, methoxyethyl vinyl ether, dimethylaminoethyl vinyl ether, and the like. Styrenes include styrene, methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, isopropylstyrene, butylstyrene, chloromethylstyrene, methoxystyrene, butoxystyrene, acetoxystyrene, polystyrene, dichlorostyrene, pamstyrene, Vinylbenzoic acid methyl ester! -Methylstyrene and the like. Examples of unsaturated nitriles include acrylonitrile, methacrylonitrile, α-ethyl acrylonitrile, α-methoxychloronitrile, and the like.

The average molecular weight of the polymer used in the present invention is /X/0'
~-x706 is preferable, and in the case of a copolymer with other copolymerizable monomers, -COOM or -803MM
It is desirable that the 1:n vinyl monomer units be contained in an amount of 1 to 1 mole of the total monomers, particularly in the range of 20 to 1 mole.

Specific examples of the polymer used in the present invention are shown below.

/ ) (-C) 12-C) i shadow C (JO) i CH3 j) +CH2-C-) uoH C) i3 ■ ≠) +CHz-C→- UUNa H 1゜j) (-CH2-C→ C(JO(0M2)3CO(JK 6) ÷CH2−C) lsuC(JNHHCCIUN a 7 ) +CHz−CH+ C0NH(C1i□) 5CO(JH CH3 ri)(CH2−C→− C(JO(C) 12CH20+90) 12CH2C(
JUN1/ / ) +CH2-C)iC0UCH2CH2CH2803Na CH3 l-1 1゛/ 4t) +0M2-C+ C(J(J(CH2) 5S03)1 S U 3 N a 0ONa /A) +CH2-C→- UONa CH2C0 (JN a / 7) % C) 12-C S C (JUNa CH3 ■, 2J) The polymers of the present invention usually have o.
, osy, 2091. In particular, it is used by coating it as a layer on a support in the range of o, i to 39. In this category 4, the effects of the present invention are exhibited without adversely affecting other photographic properties or coatability. The polymer of the present invention may be added to the same layer as the hydrophilic polymer mordant, or may be added to a layer above or below the mordant layer.

In the present invention, in addition to the above-mentioned polymers, it is preferable to use a hydrophilic colloid substance such as the above-mentioned gelatin as a binder.

A hardening agent can be used in the present invention.

There are no particular restrictions on the hardening agent KF'i% used, and known hardening agents such as aldehydes (formaldehyde, glyoxal, geltaraldehyde, etc.), hemethylol compounds (dimethylol urea, methyl dimethylhydantoin, etc.) can be used. , dioxane derivatives (l,3-dihydroxydioxane, etc.), active vinyl compounds (/, 3
, j-toIJ acryloyl-hexahydro-5-
triazine, bis(vinylsulfonyl)methyl ether, N,N'-ethylene-bis(vinylsulfonylacetami)"), N.

N'-IJ/l tyrene bis(vinylsulfonylacetamide), etc.], active halogen compounds (,2,≠-dichloro-6-hydroxy-8-triazine), mucohalogen acids (mucochloric acid, mucophenoxychloric acid, etc.) ), isoxazoles, dialdehyde starch, /-
Chlor-6-hydro-oxytriazinated gelatin, epoxy compounds (for example, can be mentioned.The amount of hardener added is arbitrary, but about 0.0% of hydrophilic colloid such as a binder that can react with the hardener) ~30 wt% is suitable.

The coating layer of the present invention may be seven layers or may have a multilayer structure of two or more layers.

In addition to the above-mentioned compounds, these layers contain anti-fading agents and ultraviolet absorbers to prevent dye fading.

It may contain a shearing agent, a matting agent, an antioxidant, an oil dispersion, a latex dispersion, and the like.

In the case of an aqueous dye having a basic group, it is preferable to contain a polymer having one acidic group or an acidic compound.In the case of an aqueous dye having all acidic groups, it is preferable to contain a basic compound or a polymer having a basic group.

Supports used for the recording sheet of the present invention include glass, paper,
Metals and their analogs are used, as well as cellulose acetate films, cellulose ester films, polyvinyl acetal films, polystyrene films, polycarbonate films, polyethylene terephthalate films and related films or plastic materials. If necessary, a paper support laminated with a polymer such as polyethylene in which a white pigment such as titanium oxide is dispersed may also be used. As a support, not only ordinary paper but also paper or cast paper can be used alone or laminated with polyethylene. Synthetic paper can also be used.

The effects of the present invention are remarkable when the support is transparent or when the side receiving the ink is laminated with a water-impermeable polymer or coated with Fi.

The transparent support used in the recording sheet of the present invention is preferably a film-like material having a transmittance of 30% or more, particularly 30 (4 or more) for light of 330M. It is a support for

Useful are films made of semi-synthetic or synthetic polymers such as cellulose nitrate, cellulose acetate, cellulose acetate butyrate, polystene, polyvinyl chloride, polyethylene terephthalate, polycarbonate, and the like. The surface of these supports may be primed to improve adhesion with the coating layer. The surface of the support may be subjected to corona discharge treatment or flame treatment before or after the primer treatment. good.

The recording sheet of the present invention has a hydrophilic binder such as gelatin on the back side in order to adjust curling, improve slippage, and provide writing properties.
It may be coated 2.0 times more.

The water-soluble dye contained in the aqueous ink used in the present invention may be any dye having at least seven sulfo groups in its molecule.

For example, Tokukai Sho≠terrij3hiro, Tokuko Shoj9t-762
≠3, Tokko Akira! j4t-/laλhiro≠, Tokuko Shoj≠-1
ti goo 1ti hiro 32-ta t10! , Japanese Patent Publication No. 32-/4
t6307, Tokukai Sho! j3-77701. , Tokko Akira! In addition to the dyes disclosed in Hiro-J/71j and JP-A-1999-3 Hiro and 7♂//, the following dyes can be used.

[1] Direct dye C, 1, Direct Ye eyes 27 (
C,1,/jri! 0) C6I, Direct Yellow
ow 21 (C,1,/ri333)C,1,D
direct Yellow 33 (C, 1,,
270,20)C,1,Direct Yellow
3ri C, 1, Direct Yellow 3
fC, 1, Direct Yellow za6C0
1, Direct Yellow 100C1I, D
irecz Red 1p3tt #
tt 7j (C, 1, 2 Jj za 0) I
tt #7ta (C, I, kota01.J) #tr s 1
0 (C, 1, 33710) II I
♂J (C, I, 2 λλj) Np
s 9ritr s tt 2.2
0I tr p , 22
41C01, Direct Violet 117
(C, 1,, 2j Hiroshi 10) IN IF
≠f (C, 1, 29123)s tt
tt j/(C,1,,27ri03
) # # tt L? OI
N I or C, 1, Dire
ct Blue / (C, 1, 24'4L1
0)〃 〃 〃 g l # tt 7/(C, 1, j
≠／≠0)1 # tt 76(
C, 1, 2≠≠//)s tr s
7J'(C, 1, j≠200) 1 #
# fQtt tt tt
f6 (C,1,71A/10)II
l/ taO # s s 101. (C, I,
3/300) 7 # # 10f
(C, 1, 313, 20) tt tt
p/, 23(C,1,2l-703)tt
s tt /1,3 (C,1,
33360) tt g tt
/1sJC,1,Direct Black /?
(C, 1, 3jt2J!;) I 〃 〃
3g (C,1,30#3)n tr
tr 7/(C, L, 2JO Hiro 0)ttt
t s7≠ (C, 1, 3≠is'o>p
s tt '7; (C, L3! Finished 7
o) tt p I //2
tr tt y //7(I
I) Acid dye C,1, AcidYellow /7 (C,1
,/Zariit)〃〃〃/Ritt tr tt 23 (C,1,
/(S'zajj)tttr p,
2ta (C, I, /♂ri00)tt y
p 31 (C01,,23133)/fll
N Hiro? ttrr p, 5ri〃 # # A/ 1'/f 〃7,2 C,1, Ac1d Red / (C,1,
/1030) tt tt s
(5' (C, 1, /4t900)tt s
tt 32 (C, 1, /7063) #
s tt 37 (C, 1, /7ol
Itj) tt tr p C2(C,
1,/7070) s p z
j7tt p p //j (
C, 1, λ7200)y s tr
//ri p tt s /j
/p tt tt /33
(C, 1, /7 Tata j) C, 1, Ac1d Red
/31A (C, 1, 24J'10>tt
l # /j4t (C,1,,21
1100) r tt tt /J'
4 (C, 1, /♂za/(7)〃〃〃 λ≠ta
(C1■, /za/3+L>tt tt
p jj4Ltr tt t
t 236C, 1, Ac1d Violet
// (C,1,/7060)tt s
tt 31fi (C, 1, 6/7
10゜61♂00) tr tt tt 73C
,1,Ac1d Blue,2ta (C,I,
, 20≠60)s tt tt
/, 26p tr tt
/7/# tt sr /
7jtt tt z /13
C01, Ac1d Black / (C,
1,,! 0Ilt70)If/ 〃
λ≠ (C, 1,, 21, 370) p p
tr, 26(C,1,λ7070)ttt
t tt IIza (C, 1, 1, 3
003) # p tt 32 (
C,1,/j7//)CJ, Ac1d Black
31111sO y s l 107tt
p I 105Ftt
p I //ri/l /F
／' ／３／〃 〃 〆
/33 Furthermore, the aqueous ink that can be used in the present invention can contain various additives that can be normally used in aqueous inks, such as wetting agents, solubilizers, and surfactants.

The advantages of the present invention are: firstly, inkjet recording with high water absorption can be easily obtained; secondly, the ink does not run out or bleed during inkjet recording, resulting in high resolution and high image density; and thirdly, it is good. Firstly, it is possible to obtain an image with a high a degree and good gloss.

The present invention will be explained in more detail with reference to Examples below.

Example-/Basic weight 1009/m"%: lubricant size 2397m"
Polymer f! as shown in Table 1 was applied to one side of the base paper. weight%
, an aqueous solution containing jiit% gelatin and 5% by weight of synthetic aluminum silicate, with a dry solid content of 7397
Coat it with an air knife coater so that it has a thickness of 100 mm, calender it for 1'k, and then apply it to an inkjet recording sheet/-j.
I created it.

A multicolor inkjet printer having μ inkjet nozzles jets aqueous inks of ≠ cyan, magenta, yellow, and ink onto the thus obtained recording sheet/~j to record monochrome and λ~μ color superimpositions. I did this.

Example/] A composition having the composition shown in Table 1 was coated on one side of a base paper having a basis weight of 1009/m'' and a bump size of 23 P/m.

A multicolor inkjet printer having ≠ inkjet nozzles jets μ-color aqueous inks of cyan, magenta, yellow, and black onto this recording sheet S/~Sj, and records magenta monochrome and μ-color overlap. Ta.

The entire magenta density of the sheet was measured.

It can be seen that the samples of the present invention are excellent in both image blur and density.

The cyan, magenta, yellow, and black water-based inks used in Examples were prepared by heating the following formulations to 7 hours and stirring them for 7 hours. It was obtained by pressure filtration.

-Cyan ink- Dye (sodium copper phthalocyanine tetrasulfonate)
;1. 0.3 parts N-methyl-1-pyolidone; 10.0 parts H-hydroxyethyl lactamide; j, O parts Neu-Gen P (surfactant: Daiichi Kogyo Seiyaku ■ ); 0.1 part water; I2.0 part 1 magenta ink key dye*; /, 6 parts diethylene glycol 7-noethyl ether;
”, 0.3 parts water;
2. lr part diethylene glycol; /, 0 parts -.2'-thiogentanol: I 6.0 parts Neugen P;
0. λ part water; 0.0 part black ink dye (C0I Ac1d Black / jjj)
; 3. J-part diethylene glycol heptanoethyl ether; /.

0 part Hemethyl-2-pyrrolidone; λo, θ part-・2'-thiogentanol: io, o part Neugen P; 007 part water: jJ, g part Example 2 Polyethylene with titanium oxide dispersed, front side 30 μm, back side 23 μm Laminated paper with a basis weight of 10091/m” and polyethylene terephthalate film!00μm
A material with the following composition was applied to a material with a thickness of .

An anti-curling layer was coated on the back of the second sample in a ratio of gelatin jp'/m'' and corn starch 0.0/9/m''. The same ink jetting experiment as in Example was conducted on this sample.

In this experiment, in 8-A, S-za, 5-io, and s-/2, the ink liquid flowed and streak-like unevenness occurred.

When rolled up, the Ura-trap ink kakatsuri (state).

In S-7,8-//, there was no streak-like ink flow or ink adhesion after winding up, but there was significant image bleeding.

In the S-tater and S-/j of the present invention, there was no ink flow and no image bleeding occurred.

Using laminated paper, nine S-ta is Example/S-≠
An image with a glossier and more transparent appearance was obtained. 8-/3 is a brightly colored transbear range-
was gotten.

Similarly, when guanidine picolinate f/, 397 m'' was added to S-/3 in the intermediate layer, a similar beautiful color transbearing range was obtained.

1. Indication of the incident: Showa 4λ petition No. 14t4tj
θ7 No. 2, title of the invention Inkjet recording sheet 3, relationship to the case of the person making the amendment Address of the license applicant 210 Nakanuma, Minamiashigara City, Kanagawa Prefecture Subject of amendment ``Detailed Description of the Invention'' column of the specification 5. Contents of amendment +11 After “may consist of.” on page 1/line of the specification letter, “-COOH group or -8Oa as a repeating unit.”
The polymer containing one vinyl monomer unit having at least one of the M groups can be contained in the layer as fine particles insoluble in a hydrophilic solvent such as water, but in this case, the main component constituting the layer is If there is a difference in refractive index with the component binder, after image formation, the degree of saturation of the orange color will decrease due to light scattering. For this purpose, it is desirable that the present polymer exists in a uniform state in the layer. ” Insert all.

(2) Delete "Other photographic properties" from the second line to the bottom of page 30 of the circular.

that's all

Claims (1)

[Claims] An inkjet recording sheet on which a recorded image is formed by jetting a water-based ink containing a water-soluble dye, the sheet having a hydrophilic polymer mordant on a support and at least one of -COOM group or -SO_3M group as a repeating unit. 1. An inkjet recording sheet comprising a layer containing a polymer containing a vinyl monomer unit.