JP3441144B2 - Inkjet recording material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous ink jet recording device.
This is related to recording materials.
Inkjet recording material with both imageability and image storability
It is about. [0002] 2. Description of the Related Art Ink-jet recording is a recording method.
Generates and flies small droplets of liquid and adheres to the recording material
Is to get more images, easily high quality, high resolution
Since images can be obtained, it is rapidly spreading in recent years. This Inn
As the recording material used in the jet recording method,
Since then, regular paper has been used. However, the ink jet
Demand for multicolor and high-speed recording methods
As a result, advanced characteristics are required for recording materials.
Swelled. Specifically, it is comparable to color gravure printing
High color resolution and high storage quality of recorded images
Good things are needed. Such color
Characteristics required for recording materials for inkjet printers
The gender satisfies the following items in detail
I can understand. 1. Good color development of ink. Specifically,
Color density is high, and colors are bright and vivid.
When. 2. Ink absorption capacity is sufficient. Specifically,
Ink is absorbed quickly, even if dots overlap,
Do not run or bleed into the driven dots
When. 3. Good resolution of recorded images. Specifically, the ink
The dots are close to a perfect circle, and the edges of the ink dots are smooth
thing. 4. Good storability of recorded images. Specifically, the recorded image
When the image is exposed to ultraviolet light, air oxygen or water
Even if it does, the fastness of the dye must not be reduced. [0003] However, all of the above-mentioned characteristics are met.
Inkjet recording materials have not yet been obtained.
The fact is that it is. For example, Japanese Patent Application Laid-Open No. 52-53012 discloses
Is to improve wet strength without reducing ink absorption
Enhance wet paper strength of picrohydrin-modified polyamide resin etc.
The degree of Stekigt size obtained by internally adding the agent is around 0 seconds.
General paper tie made by thin coating of base paper on coated paper manufacturing paint
Ink jet recording paper is described. On the other hand,
JP-A-58-72495 discloses silica pigments and water-soluble pigments.
Coating solution consisting of molecular binder applied on base paper
Is disclosed.
In addition, C.I. I. Food Black 2
Inkjet recording paper with a color below a specific value
63-252780. [0005] However, Japanese Patent Application Laid-Open No.
No. 53012 described in General Paper Type Recording Paper
Absorbs quickly, but the area around the dots is easily blurred.
There was a drawback that the cut concentration was low. Also, Japanese Patent Application Laid-Open
JP-A-72495 has ink absorbing ability on the surface of the support
Inkjet recording paper with a coating layer
Regarding the shape and density, general paper type inkjet
Although it is better than paper, it does not
Not a minute. Further, JP-A-63-253780
By the ozone test described in C.I. I. Food bra
Discoloration of the lock 2, that is, ΔE^* _abTo 20 or less
Ozone resistance of inkjet recording materials with
In some respects, but in terms of lightfastness
There is a disadvantage that it is inferior to general paper type recording paper.
The recorded image is discolored or affected by the effects of light, oxygen in the air, etc.
Sufficient enough for image storability that requires no fading
It is not enough. Accordingly, it is an object of the present invention to overcome these disadvantages.
Overcoming and improving the storage stability of recorded images such as ozone resistance
Chromogenicity, resolution and recording that meet all of the above requirements
Providing inkjet recording materials with excellent image storability
Is to do. [0007] [MEANS FOR SOLVING THE PROBLEMS]
In addition, the present inventors have conducted intensive studies and as a result, have found that the use of alumina hydrate
Is found to be effective and complete the present invention.
Was. That is, the present inventionInorganic pigment and alumina water on substrate
Ink jet recording material provided with a coating layer containing Japanese
hand, (1) The base material is a steel plate according to JIS P8122.
Paper with a size of 15 seconds or more (2) The inorganic pigment has a particle size of 0.005 to 10 μm.
m within the range of m
Surface area is 100 ± 15m ² / G, and the oil absorption
Is in the range of 150 to 350 ml / 100 g, and (3) The alumina hydrate has a particle size of 0.005 to 0.005.
Monohydrate boehmite alumina water in the range of 20 μm
It is a Japanese product, furthermore, the amount of addition, the said amount in the coating layer
Based on the total amount of both the inorganic pigment and the alumina hydrate
0.1% by weight to 50% by weight
It is a feature. Hereinafter, ink jet recording according to the present invention will be described.
The material will be described in detail. What is image storability?
That the image does not discolor or fade due to external factors.
Good, when the printed recording material is stored in a dark room
Resistance to discoloration or discoloration by oxygen and direct sunlight
Resistance to discoloration or fading due to
Can be. Indicators for these resistances are generally
Ozone resistance and light resistance are used. [0009] The ozone resistance and light resistance are examined in detail.
The discussion revealed the following. 1) E-resistant
A decrease in zoning property is caused by providing a coating layer containing pigment and binder resin.
It is hardly recognized on non-standard paper type recording paper
On the other hand, recording paper with a coating layer
And ozone resistance test for recording paper with excellent coloring properties
Discoloration is remarkable. 2) Between ozone resistance and light resistance
Has no correlation. 3) In the recording agent component
Basic dyes, acid dyes and direct dyes
Even if this is used, the above first and second points remain the same.
Absent. It is not uncommon for dyes to be decomposed by ozone.
It is well known that its decomposition depends on the surrounding ionic strength, pH, etc.
Adsorption of dyes and pigments such as environmental conditions, hydrogen bonding, intermolecular force, etc.
It is presumed that it will vary greatly depending on the state
However, the details are unknown. However, as mentioned above
From 1) to 3), the decomposition of the dye by ozone and the
The generation is different from the solution.
Inorganic pigments incorporated in the coating layer, especially in the coating layer,
Has some effect near the surface to accelerate the decomposition of the dye
It is thought that there is. Therefore, sufficient light resistance and image quality
Degradation of dye by ozone of inorganic pigment to give performance
Substance capable of suppressing the activity of promoting
Examined a system that can be used together with inorganic pigments
In addition, the decomposition of dye by ozone by alumina hydrate
I found something that could be suppressed. [0011] That is, the ink jet printer according to the present invention.
The recording material isCoating containing inorganic pigment and alumina hydrate on substrate
In an inkjet recording material provided with a working layer, (1) The base material is a steel plate according to JIS P8122.
Paper with a size of 15 seconds or more (2) The inorganic pigment has a particle size of 0.005 to 10 μm.
m within the range of m
Surface area is 100 ± 15m ² / G, and the oil absorption
Is in the range of 150 to 350 ml / 100 g, and (3) The alumina hydrate has a particle size of 0.005 to 0.005.
Monohydrate boehmite alumina water in the range of 20 μm
It is a Japanese product, furthermore, the amount of addition, the said amount in the coating layer
Based on the total amount of both the inorganic pigment and the alumina hydrate
0.1% by weight to 50% by weight
Features. The alumina hydrate used in the present invention includes:
Aluminum hydroxide, Al₂O₃・ NH₂In the chemical formula of O
Gels and crystalline ones that are represented and crystalline ones
Examples include monohydrate boehmite. This al
Various mina hydrates are commercially available, for example, AS-3
(Alumina sol, manufactured by Catalyst Kasei Co., Ltd.)
Can be done. By using the above compound, the ink
Preservation of recorded images while maintaining color development and resolution, especially
A recording material having excellent zoning properties can be obtained. This compound
It is not clear why is effective, but ozone
The discoloration of the dye due to the inorganic pigments that are compounded accelerates
Is considered to improve record preservability by suppressing
You. Alumina hydration usable in the present invention
The range of the particle size of the product is particularly in the range of 0.005 to 20 μm.
The smoothness of the coated surface can be improved by using
It is possible to obtain favorable results in terms of improved image quality. Based on the above-mentioned coating layer containing alumina hydrate,
The ink jet coating according to the present invention is provided on a material.
A recording material is obtained. As the substrate used, for example,
Paper and recycled paper, recycled paper, woodfree paper, art paper, etc.
Tylene terephthalate, polyester diacetate, etc.
Plastics, but transparent like OHP
In general, paper is used except when a large recording material is required. [0016] Ink jet ink ejection
The amount varies greatly depending on the type of printer or copier,
Make sure that the ink
In order to increase the absorption capacity of the pigment, the pigment itself in the coating layer
Increase the ink absorption capacity, thicken the coating layer, or
There are several ways to deal with this, such as increasing the absorption capacity of the paper itself.
You. Therefore, a recording material corresponding to various ink ejection amounts can be used.
Obtainable. However, it does increase the absorbency of the paper itself.
When using paper with a low degree of Sekihito size for feathering,
May occur, which is not desirable in terms of resolution.
You. Therefore, the ink absorption which is relatively thin as in the present invention is excellent.
Most of the ink ejected using a coated layer with capacity
Absorbs color and is excellent in color development, resolution and storage stability of recorded images
In order to obtain a good recording material, a high
It is preferable to use human-sized paper as the base material.
Give fruit. Stekihito's size is more than 15 seconds
When una paper is used, the color development, resolution, etc.
And a recording material excellent in quality can be obtained. Great Rhinoceros
If the degree of misalignment is less than 15 seconds, the solvent of the ink
Low color development and resolution
And the coating layer tends to fall off.
There is a tendency. Alumina hydrate has ink absorbency
Since it can be used as an inorganic pigment, alumina water
A coating solution consisting of a Japanese product and a binder resin is applied to the substrate and dried.
Inkjet coating with a coating layer of alumina hydrate alone
Recording materials can also be created. But alumina hydration
Ozone is observed in the inorganic pigment in the coating layer
It has the effect of suppressing the property that promotes discoloration,
When alumina hydrate is used in the mixture,
Image quality such as excellent color development and resolution
While suppressing discoloration due to ozone and greatly improving ozone resistance
Can be improved. Rather, inorganic pigments and alumina
It is also possible to improve the color development etc. by using hydrate in combination.
is there. Effective use of alumina hydrate in combination with inorganic pigment
The gender can be easily understood from FIG. In FIG.
Where the color difference ΔE^*Is rapidly increased by the addition of alumina hydrate
To decrease. In other words, the ozone resistance is the same as that of alumina hydrate.
It is improved sharply by increasing the added amount. Of alumina hydrate
The effect of the addition is the total of alumina hydrate and inorganic pigment.
It becomes remarkable at 0.1% by weight or more based on the weight,
If the amount is more than weight%, the amount of change
Will not be seen. Therefore, by adding 0.1% by weight or more,
Thus, the ozone resistance is efficiently improved. On the other hand, alumina
Hydrate has lower ink absorption capacity than inorganic pigments.
If the content exceeds 50% by weight, the ink absorbency may decrease.
This leads to a decrease in resolution and color development. Obedience
Therefore, considering the image quality such as resolution, alumina water
The blending amount of the sum is the total weight of alumina hydrate and inorganic pigment
Is preferably used in the range of 0.1 to 50% by weight.
No. In particular, when the content is in the range of 5 to 40% by weight, the resolution and
There is also a tendency for improvements in color and the like. Alumina water is contained in a coating layer on such a substrate.
The recording material blended with Japanese hydrate is composed of alumina hydrate and inorganic face
The mixture is mixed and dispersed to obtain a slurry, and then the binder resin is added.
Can be obtained by applying and drying the adjusted coating liquid on the substrate.
it can. The inorganic pigments used include ink absorption
You can choose one that can increase the capacity and achieve high-quality images.
preferable. As such inorganic pigments, fine powder anhydrous oxidation
Aluminum. The particle size of the inorganic pigment is usually determined by
It is acceptable if it is within the range of
In the range of 0.005 to 10 μm
This is excellent in terms of the smoothness and resolution of the coating layer surface.
If the particle size is less than 0.005 μm, the resolution tends to decrease.
Direction, and when it exceeds 10 μm, the surface of the coating layer is smooth.
Properties tend to decrease. The specific surface area of the inorganic pigment is determined by the ink adsorption.And
± 15m to affect resistance and ozone resistance ² / G
Is preferably within the range.Specific surface area85m ² / G
If less, the image density tends to decrease, and therefore,
In this range, select inorganic pigments other than alumina hydrate.
Inorganic pigments having a large specific surface area
The surface is very activated and hydrated alumina
Ozone test changes beyond activity
It is considered that color is likely to be generated. In addition, the oil absorption of the inorganic pigment is determined by the ink absorption.
It is one of the important physical properties that affect color development. one
In general, the higher the absorption, the higher the ink absorption.
Oil absorption is in the range of 150 to 350 ml / 100 g.
When using inorganic pigments, recording materials excellent in color development
can get. Coating layer if less than 150ml / 100g
Shows a tendency to decrease the ink absorbency of
When the amount exceeds 1/100 g, the coloring property tends to decrease.
Show. However, even if the oil absorption is large, the pigment particles
Most of the ink is absorbed in the pores inside the
Color development decreases due to reduced amount of ink absorbed
In some cases, The coating liquid is composed of alumina hydrate and inorganic pigment
Is mixed and dispersed in the presence of water to form a slurry.
And then adding a binder resin to the slurry.
Prepared. The binding resin used here is binding
There is no particular limitation as long as it is a high-performance polymer.
For example, oxidized starch, polyvinylpyrrolidone,
Of vinyl alcohol, hydroxyethyl cellulose, etc.
Water-soluble polymer, styrene / butadiene latex,
Vinyl acetate, polyacrylate, polyester
And synthetic polymers such as polyurethane and polyurethane.
In terms of optical density, it is preferable to use a water-soluble polymer.
Give a good result. The compounding amount of the binder resin is alumina hydrate and
Usually 10 to 200% by weight based on the total amount of the inorganic pigments
In particular, 20 to 100% by weight of ink absorption
It is preferable in terms of performance. If the amount is less than 10% by weight
If the pigment cannot be adhered to the substrate,
%, The ink absorbency tends to decrease.
Can be The coating solution thus obtained is applied on a substrate.
Air knife coater, blade coater, cast coater
Coating with a known coating device such as a hot air dryer,
Drying by known drying means such as an infrared dryer
Thus, a recording material can be obtained. The coating amount is generally a solid content.
0.5 to 50 g / m^Two, Preferably 2 to 10 g /
m^TwoIt is. The coating amount is 0.5 g / m^TwoIf less than
It is difficult to completely cover the substrate, and 50 g / m^TwoOver
If this occurs, powder fall of the coating layer will occur. In preparing the coating solution, if necessary,
Pigment dispersant, water retention agent, waterproofing agent, thickener, release agent,
Various additives such as lubricants, fluorescent dyes, ultraviolet absorbers, and writability improvers
Additives can be appropriately used in combination. Further, after the coating layer is provided, the light on the coating surface
Ink absorption for further improvement of roughness and smoothness
Super calendar, gross
Processing may be performed with a render or the like. The above-mentioned recording material according to the present invention comprises
Water-based inks commonly used for
Link can be applied. Components of such ink
Is, for example, 1 to 5 dyes such as acid dyes and direct dyes.
%, Diethylene glycol to prevent nozzle clogging
5 to 60% by weight of a water-soluble high-boiling organic solvent such as recall
And 30 to 80% by weight of water. Hereinafter, the present invention will be described in more detail using experimental examples.
You. Experimental Example 1 Alumina sol (product name: AS-
3, Catalyst Kasei Co., particle size: 0.006 to 0.02 μm)
12 parts by weight, synthetic silica as an inorganic pigment (product name: SY
LCIA450, manufactured by Fuji Silysia Limited, particle size 5.2 μm,
Specific surface area: 300m^Two/ G, oil absorption: 200 ml / 10
0 g) 18 parts by weight and sodium hexametaphosphate
1 part by weight (manufactured by Wako Pure Chemical Industries) is homogenized to 170 parts by weight of water
The slurry was dispersed by using an iser to prepare a slurry liquid. About
In 200 parts by weight of the obtained slurry, the concentration is 10 times.
% Aqueous solution of polyvinyl alcohol (trade name: PVA1)
17, manufactured by Kuraray Co., Ltd.)
And the mixture was stirred to prepare a coating solution. The obtained coating liquid is
Stekihito sizing degree according to JIS P8122 is 27 seconds
Using a bar coater on the base paper, the coating amount after drying is 7 g
/ M^TwoAnd dried in an oven (110 ° C
  5 minutes) to form a coating layer.
A recording material was prepared. The subject obtained in this way
The recorded materials are evaluated according to the following methods, and
Table 1 shows the results. Evaluation method 1 Recording method Color copier (product name: Pixel Jet, Canon
Company) and dedicated ink (product name: BJ CRG BC)
-40Bk (black), BJ CRG BC-40C (shear
BJ CRG BC-40M (magenta), BJ
  Canon Inc. such as CRG BC-40Y (yellow)
Black, magenta, cyan, yellow,
Solid putter for each color of red, blue and green
And a thin line with 5/360 inch spacing (line width: 1/360 inch
Printed). 2 Chromogenicity The optical density (OD) of the black recording portion
Using a densitometer (product name: RD918, manufactured by Macbeth)
Measured. 3 Resolution About the character part printed in blue,
The condition was visually determined according to the following evaluation criteria. (1) Two fine lines cannot be distinguished at all. (2) Two thin lines can be barely distinguished. (3) Two fine lines can be easily distinguished. (4) It is easy to distinguish two fine lines, but the edges are sharp.
Not a hoop. (5) The edges of the two fine lines are sharp, and
Can be distinguished. 4 Ozone resistance Ozone weather meter (Product name: OMS-HCR,
Ozone concentration 1 ppm, temperature 4
Recording material printed at 0 ° C. and relative humidity (RH) 56
Was exposed. Then, for the black recording part,
Color difference meter (product name: 1001DP, manufactured by Nippon Denshoku Industries Co., Ltd.)
Using the color difference (ΔE^*) Measure ozone resistance
It was the evaluation value of sex. Color difference (ΔE^*)
There is little discoloration or fading of the recorded part due to ozone
This indicates that the ozone properties are excellent. 5 Lightfastness Carbon arc lamp type fade meter (Product name: FAL
-15HB, manufactured by Suga Test Instruments Co., Ltd.)
Was irradiated with ultraviolet light for 50 hours.
Measure the optical density of the recorded part with a Macbeth reflection densitometer (product name:
RD918, Macbeth) before and after irradiation
The optical density residual ratio (R.
O. D. ) (%) Was obtained and used as an evaluation value of light resistance. R. O. D. (%) = (OD after irradiation / before irradiation)
O. D. ) × 100 6 Powder fall Wrap black paper around a cylindrical weight and adjust the contact surface pressure.
1, 2, 3, 4, 5 kg / cm^TwoSo that
A weight is slid about 20 cm on the coated paper and powder falls off on the contact surface.
It is visually judged whether or not it has been produced, and the weight
The evaluation criteria for the degree of powder dropping were used. Experimental Example 2 Fine aluminum hydroxide as alumina hydrate (product
Name: C-301, manufactured by Sumitomo Chemical Co., Ltd., particle size: 1 μm) 1
Inkjet in the same manner as in Experimental Example 1 using 2 parts by weight
Table 1 shows the results of preparing and evaluating a recording material. Experimental Example 3 Powdered anhydrous aluminum oxide as inorganic pigment (Product name: A
Luminium oxide C, manufactured by Degussa, particle size: 0.01
3 μm, specific surface area: 100 ± 15 m^Two/ G, oil absorption: 1
75 ml / 100 g) Same as in Experimental Example 1 using 18 parts by weight.
Inkjet recording material was created in the same manner
The results are shown in Table 1. Experimental Example 4 Fine aluminum hydroxide as alumina hydrate (product
Name: C-301, manufactured by Sumitomo Chemical Co., Ltd., particle size: 1 μm) 1
Using 2 parts by weight, finely divided anhydrous aluminum oxide as inorganic pigment
(Product name: Aluminum oxide C, Degussa
Made, particle size: 0.013 μm, specific surface area: 100 ± 15 m
^Two/ G, oil absorption: 175 ml / 100 g) 18 parts by weight
In the same manner as in Experimental Example 1,
Table 1 shows the results of the preparation and evaluation. Experimental Example 5 Alumina hydrate of alumina hydrate (manufactured without using inorganic pigments)
Product name: AS-3, manufactured by Catalyst Kasei Co., Ltd., particle size: 0.006 to
0.02 μm) in the same manner as in Experimental Example 1 using 30 parts by weight.
Inkjet recording material was prepared by
It is shown in FIG. Experimental Example 6 Alumina sol (product name: AS-
3, Catalyst Kasei Co., particle size: 0.006 to 0.02 μm)
15 parts by weight, synthetic silica as an inorganic pigment (Product name: SY
LCIA450, manufactured by Fuji Silysia Limited, particle size 5.2 μm,
Specific surface area: 300m^Two/ G, oil absorption: 200 ml / 10
0g) Ink as in Experimental Example 1 using 15 parts by weight
Table 1 shows the results of creating and evaluating jet recording materials.
You. Experimental Example 7 Alumina sol (product name: AS-
3, Catalyst Kasei Co., particle size: 0.006 to 0.02 μm)
6 parts by weight, synthetic silica as an inorganic pigment (product name: SYL)
CIA450, manufactured by Fuji Silysia, particle size 5.2 μm, ratio
Surface area: 300m^Two/ G, oil absorption: 200 ml / 100
g) Using 24 parts by weight of the ink jet
Table 1 shows the results of preparing and evaluating a jet recording material. Experimental Example 8 Alumina sol (product name: AS-
3, Catalyst Kasei Co., particle size: 0.006 to 0.02 μm)
3 parts by weight, synthetic silica as an inorganic pigment (Product name: SYL
CIA450, manufactured by Fuji Silysia, particle size 5.2 μm, ratio
Surface area: 300m^Two/ G, oil absorption: 200 ml / 100
g) Using 27 parts by weight of the ink
Table 1 shows the results of preparing and evaluating a jet recording material. Experimental Example 9In the same manner as in Experimental Example 1 The obtained coating liquid was used in JIS P8
Barco on base paper with a 5 second stekicht sizing degree by 122
The amount of coating after drying is 7 g / m2 using a heater.
Inkjet recording in the same manner as in Experimental Example 1
Table 1 shows the results of preparing and evaluating recording materials. Experimental Example 10 Synthetic silica as inorganic pigment (Product name: P527, Mizusawa Chemical)
Gaku Kogyo Co., Ltd., particle size: 1.8 μm, specific surface area: 30-60
m^Two/ G, oil absorption: 160 ± 20 ml / 100 g) 18
Inkjet coating was performed in the same manner as in Experimental Example 1 using parts by weight.
Table 1 shows the results of preparing and evaluating recording materials. Experimental Example 11 Synthetic silica (product name: SYLCIA77) as an inorganic pigment
0, manufactured by Fuji Silysia Ltd., particle size: 6.0 μm, specific surface area:
700m^Two/ G, oil absorption: 95 ml / 100 g) 18 layers
Inkjet recording was performed in the same manner as in Experimental Example 1 using
Table 1 shows the results of preparing and evaluating recording materials. Experimental Example 12 Fine powder anhydrous oxidation that is an inorganic pigment without using alumina hydrate
Aluminum (Product name: Aluminum oxide C,
Manufactured by Gusa, particle size: 0.013 μm, specific surface area: 100 ±
15m^Two/ G, oil absorption: 175 ml / 100 g) 12 layers
Parts and synthetic silica (product name: SYLCIA450,
Fuji Silysia Ltd., particle size 5.2 μm, specific surface area: 300
m^Two/ G, oil absorption: 200 ml / 100 g) 18 parts by weight
Inkjet recording material in the same manner as in Experimental Example 1 using
Table 1 shows the results of the evaluation. Experimental Example 13 Synthetic silica that is an inorganic pigment without using alumina hydrate
(Product name: SYLCIA450, manufactured by Fuji Silysia Ltd., granules
5.2 μm diameter, specific surface area: 300 m^Two/ G, oil absorption: 2
(00 ml / 100 g) as in Example 1 using 30 parts by weight.
Inkjet recording material was created in the same manner
The results are shown in Table 1. Experimental Example 14 JIS P8122 without coating layer
It is recorded as it is on a 27-sec.
The results are shown in Table 1. [0045] [Table 1] −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−               Color development Resolution Color difference Light fastness                 OD ΔE^*          % G / cm^Two −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Experimental Example 1 1.62 5 9.2 725 or more Experimental Example 2 1.50 4 8.2 685 or more Experimental example 3 1.62 5 10.3 705 or more Experimental Example 4 1.45 4 8.0 65 5 or more Experimental Example 5 1.44 3 6.0 7 15 or more Experimental Example 6 1.59 3 6.9 725 or more Experimental Example 7 1.64 5 12.7 69 5 or more Experimental Example 8 1.64 5 13.4 705 or more Experimental Example 9 1.45 2 10.6 70 1 Experimental Example 10 1.13 2 9.8 71 4 Experimental Example 11 1.21 3 54.1 72 2 Experimental Example 12 1.48 1 30.3 66 3 Experimental Example 13 1.69 5 45.1 73 1 Experimental Example 14 1.15 1 1.088 − −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Ratio between Experimental Examples 1 to 11 and Experimental Examples 12 and 13
From the comparison, by blending alumina hydrate in the coating layer
It can be seen that the ozone resistance is improved. Experimental Examples 1, 5 to 8
1 and 13, as shown in FIG.
As for the zoning property, the inorganic pigment, synthetic silica alone,
Alumina hydrate and inorganic pigment than ink jet recording material
The results are much better when combined with
In the case of 0% by weight, it is almost the same as that of alumina hydrate alone.
It is a numerical value of the degree. On the other hand, image quality such as color development and resolution
In the case of using both, alumina hydrate
The value is better than when used alone. Follow
Alumina hydrate has excellent color developing properties of inorganic pigments.
Caused by inorganic pigments without impairing image quality
It can be seen that discoloration due to ozone is suppressed. Experimental example
10 and 11 are inorganic pigments mixed with alumina hydrate
Ozone resistance changes depending on the type of
You. When SYLCIA770 is used alone for the coating layer
In the case of coating, the binder amount is slightly increased from the point of coatability.
It is necessary to form a working layer, and the resulting recording material
Although the heat resistance is extremely poor, the addition of alumina hydrate
The zoning property is improved to the extent shown in Experimental Example 11.
This means that inorganic pigments cause discoloration due to ozone.
Different pigments have different influences
Means that. This is an experiment without a coating layer
In the case of Example 14, the discoloration by the ozone test was extremely small.
It is understood from the fact that. For light resistance, use alumina
Alumina sol gives more favorable results among hydrates
It is shown that. From the above results, it was found that alumina hydrate was used
Ozone resistance by blending into the coating layer
Greatly improved, especially the specific surface area of the inorganic pigment used together1
00 ± 15m ² / GExcellent by using those in the range of
It has excellent ozone resistance and absorbs inorganic pigments.
Inorganic pigment with an oil amount of 150 to 350 ml / 100 g
Image quality such as resolution and color
A recording material that is excellent in both record preservability and image quality
It is understood that it can be obtained. [0048] As described above, according to the present invention, the resistance to ozone
Excellent image stability and light stability
Inkjet printing with excellent image quality such as resolution and resolution
Recording materials can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing the relationship between the amount of alumina, the color difference, and the coloring property in a coating layer containing an inorganic pigment and alumina hydrate.

Continuation of the front page (56) References JP-A-1-141783 (JP, A) JP-A-60-232990 (JP, A) JP-A-61-57380 (JP, A) JP-A-58-65692 (JP) JP-A-3-284978 (JP, A) JP-A-3-65376 (JP, A) JP-A-1-283182 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB Name) B41M 5/00

Claims (1)

(57) [Claim 1] In an ink jet recording material provided with a coating layer containing an inorganic pigment and alumina hydrate on a base material, the base material has a Steight sizing degree according to JIS P8122. the inorganic pigment is micronized anhydrous acid in the range that the grain size of 0.005~10μm but a paper is not less than 15 seconds
Is aluminum chloride and its specific surface area is 100 ± 15m
² / g , and the oil absorption is 150 to 350 ml / g.
100 g, and the alumina hydrate has a particle size of 0.005 to 20 μm .
Boehmite alumina hydrate , the amount of which is in the range of 0.1% by weight to 50% by weight based on the total amount of both the inorganic pigment and the alumina hydrate in the coating layer. An ink jet recording material, characterized in that: