JPS6163476A - Recording material - Google Patents

Abstract

PURPOSE:To obtain a recording material for ink jet recording excellent in ink receptivity and the sharpness of a recording image, by providing an ink receiving layer comprising a vinyl pyrrolidone/dialkylaminomethyl(meth)acrylate copolymer and/or a quaternary compound thereof. CONSTITUTION:The titled recording material has an ink receiving layer comprising a vinyl pyrrolidone/dialkylaminomethyl(meth)acrylate and/or a quaternary compound thereof (PVP-DAAEA). Because PVP-DAAEA shows sufficient hydrophilicity though no -OH group is present in the molecule thereof, the ink receiving layer comprising said copolymer shows no lowering in ink receptivity even under a low temp. and low humidity condition and hardly receives the effect of drying temp.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a recording material suitably used in an inkjet recording method, and particularly has excellent ink receptivity. The present invention relates to a recording material with excellent clarity of recorded images.

(Conventional technique*) The inkjet recording method uses various ink (recording liquid) ejection methods, such as an electrostatic suction method, a method that applies mechanical vibration or displacement to the recording liquid using a piezoelectric element, and a method that applies mechanical vibration or displacement to the recording liquid using a piezoelectric element. In this method, small droplets of ink are generated and made to fly, and some or all of them land on a recording material such as paper to perform recording.
It is attracting attention as a recorder that generates little noise and can perform high-speed printing and multicolor printing.

Ink for inkjet recording is mainly composed of water for safety and recording characteristics, and polyhydric alcohols are added to prevent nozzle clogging and improve ejection stability. In many cases.

Conventionally, the recording material used in this inkjet recording method is a recording material formed by providing a porous ink-receiving layer on a base material called ordinary paper or inkjet recording paper. However, as the performance of inkjet recording bags increases, such as faster recording and multi-color recording, more sophisticated and wide-ranging properties are being required of recording materials. That is, as a recording material for inkjet recording to obtain high-resolution, high-quality recorded images, (1) the ink must be accepted by the recording material as quickly as possible;

(2) Even if ink dots overlap, the ink applied later will not flow into the previously deposited dots; (3) the ink droplets will spread on the recording material, and the diameter of the ink dots will be (4) The shape of the ink dot should be close to a perfect circle, and (5) the circumference should be smooth.

(5) The 00 (optical density) of the ink dot is high.

The area around the dot will not be blurred, It is necessary to satisfy basic requirements such as:

Furthermore, in order to obtain high-resolution recorded image quality comparable to color photography using multicolor inkjet recording, in addition to the above-mentioned required performance, (6) the coloring components of the ink must have excellent color development; 7) Since the same number of droplets as the number of ink colors may adhere to the same cylinder, the ink fixation properties are particularly excellent; (8) The surface is glossy; (9) High whiteness and shade performance are required.

In addition, images recorded by inkjet recording have traditionally been used exclusively for surface image observation, but as the performance of inkjet recording devices has improved and become more widespread, recording materials suitable for purposes other than surface image observation have become available. It is becoming demanded. Other uses for recording materials other than surface image observation include those used to project recorded images onto a screen, etc. using a slide or an 0HP (overhead/top projector) '4 optical device and observe those images. , a color separation plate for creating a positive plate for color printing 1, a CMF (color mosaic filter) used for color displays such as liquid crystals, and the like.

When a recording material is used for surface image observation, the diffused light of the recorded image is mainly observed, whereas for recording materials used in these applications, the problem is mainly the transmitted light of the recorded image. Become. Therefore, it is required to have excellent light transmittance, especially linear light transmittance, in addition to the above-mentioned performance requirements of the general recording material for inkjet recording.

(The problem that the invention is trying to solve) However,
The reality is that there is still no known recording material that satisfies all of these required performances.

In addition, most conventional recording materials for surface image observation use a method in which a porous ink-receiving layer is provided on the surface, and the recording liquid is received in the porous voids to fix the recording agent. Due to its porous nature, the surface of the recording material lacked gloss.On the other hand, if the surface of the ink-receiving layer is non-porous, non-volatile components such as polyhydric alcohols in the ink may disappear after recording. Because the ink remains on the surface of the recording material for a long time and the drying and fixing time of the ink is long, when it comes into contact with the recorded image, clothing may become limp.
This has the disadvantage that the recorded image may be damaged.

An object of the present invention is to provide a recording material for inkjet recording which is particularly excellent in ink receptivity and the clarity of a single recorded image.

4: Another object of the invention is to provide a recording material for full-color inkjet recording that has excellent ink receptivity, sharpness of recorded images, and surface gloss.

Another object of the present invention is to use an optical device such as a slide or OHP to project a recorded image onto a screen for observation, a color separation plate for creating a positive plate for color printing, or a color separation plate for liquid crystal display. C used for display
An object of the present invention is to provide a recording material for inkjet recording that can be used for observation of transmitted light such as MF.

The first and other objects of the present invention are achieved by the present invention as follows.

(Development of the Invention) That is, Undiscovered 1 is a copolymer of vinylpyrrolidone and dialkylaminoethyl (meth)acrylate and/or a quaternized product thereof (hereinafter abbreviated as PVP-DAAEA. Also, (meth) The term "acrylate" includes both acrylate and methacrylate.

To explain the present invention in detail, the recording material of the present invention is mainly characterized in that its recording surface contains PVP-DAAEA, and the object of the present invention is mainly achieved thereby.

The recording material of the present invention generally comprises a cover material as a support and a recording surface provided on the surface thereof, that is, an ink-receiving layer. An embodiment in which all of the receptor layers are translucent, and the recording material as a whole is translucent.

(2) The aspect in which the surface of the ink-receiving layer is smooth and glossy is most preferable! As E', in the two embodiments described in 1-, the ink-receiving layer has a protective layer on the surface of the ink-receiving layer made of a material having lower wood-philicity than PVP-DAAEA constituting the ink-receiving layer. Examples include aspects in which it has.

Furthermore, in each embodiment, the ink receiving layer may also function as a support.

Some preferred embodiments such as I- below are taken as representative examples.
(To explain the invention in more detail, PVP-DAAEA, which mainly characterizes the invention, is specifically a polymer represented by the following structural formula.

and/or in the above formula, m + 11 is preferably 100 to 1
0.0OC), and m:'n is preferably 2o:l~
1:3, and Y, Y', and Y'' are lower alkyl 75 having 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms, and may be the same or different. X is a hydrogen atom or a methyl group; , Z are anionic groups. In the present invention, by appropriately selecting the above m, n, Y-Y''',
You can arbitrarily change the parentness and ink receptivity of the +7i compound.For example, increase the value of 1m, or
If a methyl group or an ethyl group is used as Y'', the copolymer will have greater wood-philicity; on the other hand, if n is increased or
If an alkyl group larger than a propyl group is used as ", the hydrophilicity of the copolymer can be reduced. Particularly preferred in the present invention is one in which the above formula %+1 is from 300 to 5,000, and YNY ” is methyruno S or ethyl group. That is, the content of 1 m (i
If Xj exceeds the range indicated by l, the recording operability of the recording material will be poor as described below, and if the content of n exceeds the range indicated by [;, ink receptivity will be impaired, so it is preferable. do not have.

In addition, the PVP-DAAEA used in the formation of the ink-receiving layer in 1 is manufactured by adding O to about 50 mol% of a third vinyl monomer to the total monomer.
For example, it may be obtained by polymerizing vinyl chloride, vinyl acetate, styrene, and the like. All of the above copolymers can be prepared by known methods 7) and 11, and can be easily obtained manually from the market.
Even if the above two types of copolymers are mixed, the degree of polymerization l/J,
You may use a mixture of these.

Conventionally, hydrophilic resins have been used for the ink-receiving layer of recording materials because the inks used are water-based inks, or many of these resins are made of polymers such as polyvinyl alcohol. Most of the resins themselves had hydrophilic properties due to the hydrophilic 10H groups contained in the side chains.

However, when the polymer side chain contains 10H)&, hydrogen bonds are formed between the polymer molecular chains, and the bonds between the molecular chains become strong, resulting in a decrease in ink receptivity. In particular, under low-temperature conditions where the interlocking of segments within polymer molecules weakens, and under low-humidity conditions where fewer water molecules are absorbed into the resin layer from the air, hydrogen bonds between polymer molecules become stronger and crystallization progresses. Therefore, the ink receptivity decreased significantly. Furthermore, with many conventional resins, if the temperature during polymer drying is raised too high, crosslinking occurs, such as the formation of ether bonds between -OH groups in the molecular chains, which further reduces ink receptivity. was there.

In addition, the ink receiving layer of the recording material is made of vinyl pyrrolid 7.
When formed from a II+ polymer, that is, polyvinylpyrrolidone, there is no decrease in ink receptivity under low temperature and low humidity conditions. However, the surface of the ink-receiving layer may become sticky or sticky due to absorption of moisture in the air, especially under high humidity conditions, the recording materials may become sticky when stacked on top of each other, or may become sticky when loaded into a recording device. When recording, there are problems such as adhesion between the recording material and the recording material feed roller, making it impossible to feed the recording material, and the strength of the film that forms the layer is weak, especially when it receives ink.) It becomes brittle for 3 minutes and becomes 21f1 more fragile than the base material when touched by objects.
This caused problems such as 1 being likely to occur.

The present invention is applied to such conventional recording materials.

The above-mentioned PVP-DAAEA, which is characterized as 1:, exhibits sufficient hydrophilicity despite the absence of 10H groups in the molecule, so an ink-receiving layer made of such a copolymer is So low temperature.

Ink receptivity does not deteriorate even under low humidity conditions.
It is also less susceptible to the effects of drying temperature.

The ink receiving layer of the recording material of the present invention is made of PVP as described above.
- Since it is formed from DAAEA, the problems described in L are also solved, and it has excellent ink receptivity and clarity of recorded images, and also has excellent recording operability, and is a recording material that is transparent or has a glossy surface. It became.

As the base material used as the support for the ink-receiving layer in ``Made 1'', any conventionally known base material, such as transparent or opaque, can be used, and suitable examples of the transparent base material include, for example, polyester resin. ], diacetate resins, triacetate resins, acrylic resins, polycarbonate resins, polyvinyl chloride resins, polyimide resins, films or plates of cellophane, celluloid, and glass plates. Preferred examples of the opaque substrate include, for example, general paper, cloth, wood, metal plates, synthetic paper books, and the above-mentioned transparent substrates treated to make them opaque by known means.

The recording material according to the aspect (1) of the present invention includes PVP-D as described above on a transparent base material among the base materials as described above.
AAEA alone or a mixture of this and other translucent polys
It can be prepared by forming a translucent ink-receiving layer from a mixture with

The method for forming the ink-receiving layer described in item 1 is to dissolve or disperse PVP-DAAEA described in item 1 alone or a mixture of one of these compounds and another suitable polymer in a suitable solvent and prepare a coating solution. A method in which the coating 1' solution is applied onto a transparent substrate by a known method such as a roll coating method, a rod bar coating method, a spray coating method, an air knife coating method, etc., and then promptly dried. is preferable, PVP-DAAEA of -L
Method of hot-melt coating alone or in mixture with other polymers or materials as described above.
Other methods may also be used, such as forming a single sheet for the ink-receiving layer and laminating the sheet to a T-2 substrate.

L: In the method as described in (7)-r-1PVP-DAA
Preferred examples of other polymers that can be further mixed with EA include albumin, gelatin, casein, starch, cationic starch, gum arabic, natural resins such as sodium alginate, polyamide, polyvinylpyrrolidone, quaternized polyvinylpyrrolidone, polyethyleneimine,
Polyvinyl bilicylium halide, melamine resin, polyurethane, carboxymethyl cellulose, polyester, SBR latex, NBR latex, polyvinyl formal, polymethyl methacrylate, polyvinyl butyral, polyacrylonitrile, polyvinyl chloride, polyvinyl acetate, phenolic resin, alkyd resin Synthetic resins such as these are mentioned, and one or more of these materials may be used as desired. The PVP-
When used in combination with DAAEA, PVP-DA
AEA and other polymers in a weight ratio of 20:l-1:2
0, preferably in the range of 15:1 to 1:10.

In addition, in order to further improve the ink receptivity of the ink receptive layer in the above method, one such as silica, clay, talc, diatomaceous material, calcium carbonate, calcium sulfate, Bauwaum sulfate, aluminum silicate, synthetic zeolite, alumina, m
Fillers such as zinc chloride, lithopone, sachinwhite, etc. can also be dispersed in the ink-receiving layer.

In the present invention as described below, the thickness of the ink receiving layer formed on the base material is usually about 1 to 200 ILm, &f
Preferably, it is about 5 to 100 m.

The recording material of the present invention is obtained as described in 1 below, but according to detailed research by the present inventor, the ink receptivity of the ink receptive layer and In order to further improve image clarity, it has been found that an even more excellent recording material can be obtained by forming a protective layer that allows ink to freely pass through and has the function of protecting the surface.

Such a protective layer is a thin layer made of natural or synthetic resin provided on the ink-receiving layer formed as described above, and when a droplet of ink is attached to the surface of the thin layer, the ink-receiving layer is rapidly (e.g., within a few seconds) increasing the contact area to such an extent that the droplets do not overlap excessively with other droplets adjacent to each other;
It also has the function of promoting penetration into the ink-receiving layer and reception of ink by the ink-receiving layer.

The inventor of the present invention conducted extensive research in order to impart the above-mentioned functions to the ink-receiving layer, and unexpectedly discovered that PVP-DAAEA, which constitutes the ink-receiving layer, was deposited on the ink-receiving layer.
The inventors have found that the above functions can be easily achieved by forming a stratum corneum made of a polymer having a hydrophilicity comparable to, preferably, inferior to that of the present invention. It was truly surprising that such an improvement was achieved even with thin films of polymers that are, for example, completely or poorly soluble in water.

The protective layer having the above-mentioned functions is made of a polymer having a hydrophilicity comparable to that of PVP-DAAEA forming the ink-receiving layer, preferably having a relatively poor hydrophilicity, and having a hydrophilicity of less than about 10 lm, preferably about 0.1 to 5 gm. This was achieved by forming a thin film with a thickness of . Polymeric materials useful in forming such thin films include homopolymers or copolymers of vinyl acetate, acrylic esters, ethylene, vinyl chloride, and other vinyl monomers, and combinations of such vinyl monomers with various hydrophilic vinyl monomers. In addition, polymers such as vinylon, polyurethane, cellulose derivatives, polyester, polyamide, and other wood-loving polymers for forming the ink-receiving layer, singly or in combination, can be used to form an ink-receiving layer. It is preferable to select one that is less hydrophilic than the other layers.

The selected polymer may be a solution in an organic solvent, but is preferably used in the form of an emulsion in an aqueous medium, an organic solvent, or a fine dispersion in an aqueous medium.
When used as an organic solvent solution, relatively! It is preferable to use a concentration such that the dilute solution or layer formed falls within the above range.

The method for forming the protective layer using the materials described in 1-1 can be the same as the method for forming the ink-receiving layer described above.

Although the recording material of the present invention provided with the above-mentioned protective layer has the same level of hydrophilicity as the ink-receiving layer or is inferior to the hydrophilicity of the protective layer, the recording material of the present invention has the above protective layer. It is surprising that ink receptivity, image clarity, ink fixability, etc. are significantly improved compared to conventional recording materials that do not have such protective layers. At present, the rationale for this is unknown, but according to the mere imagination of the present inventor (the present invention is not limited in any way by such a wide imagination), the above-mentioned protective layer is not necessarily Rather than a continuous film, there are countless microscopic gaps in the protective layer that allow the water-based ink to penetrate into the ink-receiving layer, and the surface is irregular on a microscopic scale, resulting in small ink droplets adhering to the protective layer. It is thought that the element I'i'' diffuses on its surface, expanding the contact area between them, and thus significantly promoting the ink absorption and fixing properties of the ink-receiving layer. The recording material of the present invention has the following configuration:
Since the protective layer can be formed from a polymer with low water resistance compared to the ink-receiving layer, even in a high-temperature, high-humidity atmosphere, the ink that has been received may leach onto the surface and contaminate equipment, operators, or fellow personnel. Without a doubt,
Furthermore, the surface does not become sticky under high temperature and high humidity conditions.

Further, in the present invention, in the recording material of various embodiments such as one or more, fine powder of organic or %[ is added to the recording surface at a rate of about 0.01 to about 1.0 g/m'. By adding the resin, it is possible to further improve the conveyance property in the printer, the blocking resistance during stacking, the fingerprint resistance, etc. of the resulting recording material.

The recorded material of the present invention is formed using the above-mentioned main materials, and the preferred embodiment of (1) above is that all of the protective layer on the base material and the ink-receiving material are translucent, and the linear transparent material is transparent. This is an embodiment in which the light rate is 10% or more and the recording material as a whole is transparent. This type of recording material has particularly excellent light transmittance, and is mainly used in OHP applications in which a recorded image is projected onto a screen or the like using an optical device, and is useful as a recording material for transmitted light observation. .

In the present invention, sufficient light transmittance means that the recording material preferably exhibits a linear light transmittance of at least 10%.

If the linear light transmittance is 2% or more, it is possible to project the recorded image onto a screen and observe it using an OHP, for example, and in order to clearly observe the details of the recorded image,
It is desirable that the linear light transmittance is 10% or more.

Here, the moon linear transmittance T (%) means that the light is incident perpendicularly to the sample, is transmitted through the sample, and is at least 8
From C11 onwards] Measure the spectral transmittance of the straight light that passes through the light-receiving side slit on the extension line of the two separate incident optical paths and is received by the detector using, for example, a 323-type Hitachi self-recording spectrophotometer (manufactured by Hitachi, Ltd.). The Y value of the color tristimulus value is determined from the measured spectral transmittance using a linear equation.

T=Y/Y, Light -t<C An integrating sphere is provided behind the sample to determine the light transmittance including diffused light. ) and opacity (determined from the ratio of white and black backings placed on the back of the sample).

The problem with devices that use optical technology is the behavior of straight-line light, so when evaluating the light transmittance of the recording material to be used in those devices, it is important to check the straight-line transmittance of the recording material. It is particularly important to seek

For example, when observing a projected image on an OHP, the contrast between the recorded area and the non-recorded area is high.
That is, it is required that the recording material has a linear light transmittance of -7 or more. In the test using the OHP test chart.

In order to obtain a suitable image, the in-line transmittance of the recording material should be 2% or more, and in order to obtain a clearer image,
Preferably, a change of heart is 10% or more. Therefore, a recording material suitable for this purpose must have an in-line transmittance of 2% or more.

The preferred embodiment of (2) above is also one of the embodiments of Rij (1), in which the surface of the ink receiving layer or protective layer is smooth and the 45 degree specular gloss based on JIS Z8741 is 30% or more. It is characterized by This type of recording material has particularly excellent surface gloss, and is particularly useful as a recording material for observing surface images in full color and excellent clarity. The recording material in this embodiment may be transparent or opaque, and either the above-mentioned transparent or opaque base materials can be used. The ink receiving layer and protective layer formed on these base materials may also be transparent or opaque.

The materials and methods used to form the ink-receiving layer and the protective layer are the same as those described in iiO (1), but the fillers and the like can be added to the ink as long as the surface of the ink-receiving layer can maintain smoothness. Opaque receptor layer 1! It may be used to the extent that it becomes II.

If necessary, a cast coating method may be used in addition to the above-mentioned coating method, or glossing may be performed using a gloss roll.

Below I-1 Typical recording materials of the present invention! Although the present invention has been explained by exemplifying the embodiments, the recording material of the present invention is of course not limited to these embodiments. In any embodiment, the ink receiving layer and/or the protective layer These include dispersants, fluorescent dyes, pHgJftI agents, antifoaming agents, lubricants, preservatives, and interfaces! Various known additives such as activators can be included.

Note that the recording material of the present invention does not necessarily have to be colorless, and may be a colored recording material.

The recording material of the present invention containing PVP-DAAEA as described above has a surface that does not become sticky even under high humidity conditions, solving the various problems described above, and also under low temperature and low humidity conditions. There is no problem of low ink receptivity as with conventional recording materials, and it has excellent ink receptivity and ink fixation, so for example, recording liquids of different colors may adhere to the same spot repeatedly within a short period of time. In this case, the recording liquid does not run out or seep out, and high-resolution, clear, water-resistant images with excellent color development can be obtained. Furthermore, it is possible to provide excellent surface gloss that has not been seen with conventional inkjet recording materials, and it is also suitable for slides and OH recording materials.
Conventional surface images such as those used for observation by projecting recorded images onto a screen etc. using optical equipment such as P, color separation plates when creating positive plates for color printing, or CMF used for color displays such as liquid crystals. w;l Can be applied to uses other than dormitory use.

Hereinafter, the method of the present invention will be explained in more detail according to Examples. Note that parts in the text are based on weight.

Example 1 A polyethylene terephthalate film (manufactured by Toshi) with a thickness of 1001 Lm was used as a translucent base material.

On this film, a copolymer of vinylpyrrolidone and dimethylaminoethyl methacrylate (molar ratio 9:1) 2
0% aqueous solution (manufactured by COPOLYMER-5937GAF)
was coated by a percoater method so that the film thickness after drying was 15p layer, and dried at 80° C. for 10 minutes to obtain a translucent recording material of the present invention. The delayed recording material of the present invention thus obtained was colorless and transparent.

Example 2 The polyester film used in Example 1 was used as a translucent base material, and vinylpyrrolidone and dimethylaminoethyl methacrylate-1 (molar ratio 8:2) were coated on this film.
20% aqueous solution of copolymer with (COPOLYMER-84
5. Made by GAF), the thickness of the ink absorption layer after drying is 20
Coated by percoater method to give gta +1.60
It was dried by heat treatment at °C for 20 minutes to obtain a translucent recording material of the present invention. The thus obtained recording material of the present invention was colorless and transparent.

Example 3 The polyester film used in Example 1 was used as a translucent base material, and vinylpyrrolidone and dimethylaminoethyl methacrylate (molar ratio 7:3) were applied on this film.
20% solution of quaternary chloride co-polymerized product (GAFQO^T-7
55, made by GAF), the thickness of the ink absorption layer after drying is 2
Coated using the percoater method to give a coating of 60
The translucent recording material of the present invention was dried by heat treatment for 20 minutes at 11).The thus obtained recording material of the present invention was colorless and transparent.

Example 4 A recording material of the present invention was obtained in the same manner as in Example 2, except that art paper was used as the substrate. The obtained recording material was white and opaque.

, tj k Example 5 A polyethylene terephthalate film (manufactured by Toshi) with a thickness of l 00 pm was used as a transparent base material, and vinylpyrrolidone and dimethylaminoethyl methacrylate (molar ratio 8:2) were placed on this film. 20% copolymer with
An aqueous solution (manufactured by COPOLYMER-845GAF) was applied by a percoater method so that the film thickness after drying was 20 W, and dried at 60° C. for 20 minutes to form an ink receiving layer.

Next, apply the following coating solution onto the ink-receiving layer until the dry film thickness is 3.
．． A protective layer was formed by drying at 60° C. for 15 minutes to obtain a transparent recording material of the present invention.

Painting 1. i Ifk composition: Acrylic acid ester (Daikaratsu S-1235) 5 parts 1 Ethanol 95 parts Comparative Example 1 The polyester film used in Example 1 alone was used as a recording material.

Comparative examples 2-3 Polyvinyl aluminum is used as a coating liquid for the ink-receiving layer.

:L-L (PVA-C5T, manufactured by Kuraray) 10% aqueous solution (
Comparative Example 2) and polyvinylpyrrolidone (PVPK-3)
A recording material was obtained in the same manner as in Example 2, except that a 10% aqueous solution (manufactured by GAF) was used.

Comparative Example 4 The art paper used in Example 3 was used as it was as a recording material.

An on-demand inkjet recording head (discharge orifice diameter 60mm layer, piezo vibration Child drive voltage 70v1
Inkjet recording was performed using a recording device having a frequency of 2 KHz).

Yellow ink (composition) C, 1, Direct Niro 86 2 parts diethylene glycol 20 parts polyethylene glycol #2
00 10 parts water
70 parts Red ink (composition) C, R, Ashi, Dread 35 2 parts diethylene glycol 20 parts polyethylene glycol #2
00 10 parts water
70 parts + Fink (composition) C, 1, Direct Blue 86 2 parts diethylene glycol 20 parts polyethylene glycol #2
00 10fi water
70 parts black ink (composition) c, r, food black 2 2 parts diethylene glycol 20 parts polyethylene glycol #
2G0 10 parts water
The evaluation results of the recording materials of Examples and Reference Examples described in Part 70 are shown in Table t51. The l1III formula for each evaluation item in Table 1 followed the formula υ.

(1) Ink fixation time was measured by measuring the time required for the ink to dry and stop adhering to the finger when touching the recorded image after recording.

(2) The dot density was measured using a Sakura Mine Rodensidometer PD by applying JIS K7505 to the printed microdots.
The black dots were measured using M-5 (manufactured by Konishiroku Photo Industry Co., Ltd.).

(3) OHP suitability was measured as a representative example of optical equipment, and the recorded image was projected onto a screen using OHP.
Judging by visual observation, the non-recorded area is bright, the 00 (optical density) of the recorded image is high, and a clear and easy-to-see projection image with high contrast is obtained. If the OD is rather low and the line with a pitch width of 0.5 mm and a thickness of 0.25 mm cannot be clearly distinguished, Δ, the non-recorded area is quite dark, the OD of the recorded image is quite low, the pitch width is 1 mm, and the thickness is 0. .3
A case where the mm line could not be clearly distinguished or a case where the non-recorded area and the recorded image could only be distinguished was rated as "×".

(11) Linear light transmittance is calculated using Hitachi type 323 self-recording spectrophotometer (
II s7 (manufactured by Seisakusho v4), the distance from the sample to the light-receiving side was maintained at about 90 degrees, and the spectral transmittance was measured and determined by the above equation (1).

(5) Gloss was measured by measuring the 45° specular gloss of the surface of the recording material based on JIS Z8741.

(Margins below) 1bo L≦L-62” Bureau Mackerel L Yue 345 Engineering 2 No. H5 minutes 3 minutes 3 minutes 3 minutes
1 minute 10℃30 3 minutes 2 minutes 2 minutes 2 minutes 1
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1. io, 1lOHP OOOO rJ' -1d 80% so%go%
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Minutes 20℃ 80 translation H10 days 20 minutes Printed part 5 minutes peeling 10℃30 stations H10 days 30 minutes 3 minutes 5
1.2 1.1
1.1 0.5 units 000- 0 songs 74% 82% 80% - to
---38%

Claims (2)

[Claims] (1) A recording material for inkjet recording characterized by having an ink-receiving layer made of a copolymer of vinylpyrrolidone and dialkylaminoethyl (meth)acrylate and/or a quaternized product thereof. (2) The ink-receiving layer has a copolymer of vinylpyrrolidone and dialkylaminoethyl (meth)acrylate constituting the ink-receiving layer and/or
The recording material for inkjet recording according to claim (1), further comprising a protective layer made of a substance having lower hydrophilicity than the quaternary compound thereof.