JPH079758A - Recording medium and ink jet recording method using the same - Google Patents

Abstract

PURPOSE:To suppress the deterioration of a recording medium under a high temp. and high humidity condition by forming the ink receiving layer provided on the base material of a recording medium from a compsn. containing a polymer containing at least an alkylene oxide part and an aromatic ring part in the same molecule thereof. CONSTITUTION:A recording medium used in an ink jet recording method emitting ink from the orifices of a recording head by heat energy applied according to a recording signal has a base material such as a plastic film and the ink receiving layer provided on at least one surface thereof. In this recording medium, the ink receiving layer contains 1-90wt.% of a polymer containing at least an alkylene oxide part and an aromatic ring part in the same molecule thereof as an essential component. The liquid medium component of ink is based on water, water-miscible glycol or glycol ether.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium suitable for ink jet recording and an ink jet recording method using the same.

[0002]

2. Description of the Related Art As a recording medium conventionally used for ink jet recording, a coating layer containing fine silica powder and a water-soluble binder such as polyvinyl alcohol on a base paper is disclosed in Japanese Patent Publication No. 3-26665. And a glossy paper obtained by forming a film containing a polyvinyl alcohol having a degree of saponification of 50 to 90 mol% and a crosslinking agent on a cast coated paper, as described in Japanese Patent Publication No. 3-25352. As described in JP-A-60-220750, a recording sheet for an overhead projector (OHP) having a hydrophilic film made of a water-soluble polyvinyl alcohol having a saponification degree of 70 to 90 mol% on a polyester film is disclosed. Has been used.

[0003]

In recent years, speeding up of recording,
Along with the improvement in the performance of inkjet recording apparatuses such as multicolor printing, more advanced and broader characteristics are required for inkjet recording media. That is, (1) the ink absorption capacity is high (the absorption capacity is large, the absorption time is fast), (2) the optical density of the dot is high, and the periphery of the dot is not blurred. (3) The dot shape is close to a perfect circle. Smooth surroundings (4) Small changes in characteristics due to changes in temperature and humidity, curling does not occur (5) Blocking does not occur (6) Images are stable and do not deteriorate during long-term storage (especially,
(High-temperature and high-humidity environment) (7) It is required that the recording medium itself is stable and does not deteriorate during long-term storage (especially, in a high-temperature and high-humidity environment).

Further, in the OHP recording sheet and the like,
Further, it is also required that the recording medium itself has excellent transparency.

These various characteristics are often in a trade-off relationship, and it has been impossible to satisfy them at the same time with the conventionally known technology. For example, each of the exemplified recording media of the prior art has a certain level of dot shape and blocking resistance, but since the ink absorption capacity is insufficient, a portion with a high image density, that is, ink ejection Image smearing and density unevenness occur due to ink overflow in a large amount of the area, and especially in the case of color printing, color smearing occurs due to color mixing at the boundary of different colors.

As the recording speed increases, the image density increases, and the color increases, deterioration of the image quality due to defective ink fixing becomes a serious problem.

The recording medium provided with an ink receiving layer mainly composed of polyvinylpyrrolidone described in Japanese Patent Publication No. 3-29596 has a relatively good ink absorbing capacity at room temperature and normal humidity, but at high temperature and high humidity. The ink below is extremely slow to dry and easily causes blocking. In addition, the recording surface has a weak mechanical strength and is easily scratched.

Further, the recording medium provided with the ink receiving layer mainly composed of polyvinyl alcohol described in the section of the prior art is good in terms of blocking resistance and mechanical strength of the recording surface, but the recording medium itself is The problem is that the ink deteriorates when left for a long time in a high temperature and high humidity environment, and the ink absorption capacity declines, or when the image is left for a long time in a high temperature and high humidity environment, dots bleed and the image sharpness decreases. There is.

Therefore, an object of the present invention is to provide a recording medium which satisfies the above-mentioned various characteristics at the same time in a well-balanced manner and an ink jet recording method using the recording medium.
It is an object of the present invention to provide a recording medium itself, or a recording medium that hardly deteriorates even if an image is left in a high temperature and high humidity environment for a long time, and an inkjet recording method using the same.

[0010]

The above object can be achieved by the present invention described below.

In a recording medium including a substrate and an ink receiving layer provided on at least one surface of the substrate, the ink receiving layer has at least the same molecule in the following structure: (i) alkylene oxide part (ii) aromatic ring part A recording medium characterized by containing a polymer containing both of them as an essential component, wherein the content of the polymer in the ink receiving layer is in the range of 1 to 90% by weight. . Further, the inkjet recording method is characterized in that ink is ejected from the orifice of the recording head to the recording medium according to a recording signal to perform recording.

Further, it is an ink jet recording method for recording on a recording medium by ejecting ink from an orifice of a recording head according to a recording signal, wherein the liquid medium component of the ink is water and a water-miscible glycol or glycol ether. It includes a composition mainly composed, an ink jet recording method in which ink is cyan, magenta, yellow and black ink, and an ink jet recording method in which ink is ejected by thermal energy.

[0013]

The present inventors have developed a recording paper suitable for ink jet recording and a transparency film for an overhead projector, and a recording medium coated with the above composition has a very high ink absorption capacity. , The dots are clear and sharp, the blocking resistance is excellent, the change in performance is small even with changes in environmental conditions such as temperature and humidity, and the recording medium is stable for long-term storage especially in a high temperature and high humidity environment, Further, they have found that a stable image can be formed for long-term storage under a high temperature and high humidity environment, and have completed the present invention.

That is, by containing an alkylene oxide moiety, the affinity for ink, especially water,
Increased affinity for water-miscible glycols or glycol ethers, extremely high ink absorption capacity,
It is considered that dots are clear and a sharp image can be obtained. In addition, by containing an aromatic ring portion, it has excellent blocking resistance, changes in performance little with changes in environmental conditions such as temperature and humidity, and forms stable images for long-term storage in high temperature and high humidity environments. It has been found possible.

Next, the present invention will be described in more detail with reference to preferred embodiments.

The polymer used in the present invention contains an alkylene oxide moiety and an aromatic ring moiety in the same molecule. The alkylene oxide moiety and the aromatic ring moiety may be either a main chain or a side chain in the polymer. May be included in.

For example, as a monomer, a vinyl compound containing an alkylene oxide moiety (α, β-unsaturated ethylenic compound) and a vinyl compound containing an aromatic ring moiety (α, β)
-Unsaturated ethylenic compound) is used for copolymerization,
A polymer containing an alkylene oxide moiety and an aromatic ring moiety in the side chain is obtained.

For example, as a vinyl compound containing an alkylene oxide moiety, (1) CH ₂ ═C (R ₁ ) —CH ₂ —O— (CH ₂ CH
₂ O) n-R ₂ R ₁ : HorCH ₃ R ₂ : HorC ₁ -C ₄ alkyl group n = 2-50 (2) CH ₂ = C (R ₁ ) -CH ₂ -O- (CH ₂ CH ₂ C
_{H 2 O) n-R 2} R 1: HorCH 3 R 2: HorC 1 -C alkyl group n = 2-40 (3 of _{4) CH 2 = C (R} 1) -CH 2 -O- (CH 2 CH
₂ O) m- (CH ₂ CH ₂ CH ₂ O) 1-R ₂ R ₁ : HorCH ₃ R ₂ : HorC ₁ -C ₄ alkyl group m + l = 2-40 (4) CH ₂ = C (R)- _{COO- (CH 2 CH 2 O)} n
_{-H R: HorCH 3 n = 2-24} (5) CH 2 = C (R) -COO- (CH 2 CH 2 O) n
_{- (CH 2) p-H} R: HorCH 3 n = 2-24 p = 1-16 (6) CH 2 = C (R) -COO- (CH 2 CH 2 O) n
_{-Phenyl- (CH 2) p-H} R: HorCH 3 n = 2-24 can be mentioned p = 1-16 and the like.

Specific examples include Nippon Oil & Fats Co., Ltd. Bremmer series, Shin-Nakamura Chemical Co., Ltd., NK ester series and the like.

As the vinyl compound containing an aromatic ring portion,
Typical examples thereof include styrenes such as styrene, α-methylstyrene, vinyltoluene, and vinylnaphthalene (derivative).

Further, the monomer is not particularly limited as long as it is a copolymerizable one such as (meth) acrylic acid, (anhydrous) maleic acid and the like, derivatives of these alkyl ester compounds and the like, acrylamide and the like. However, these α, β-unsaturated ethylenic compounds may be mixed during copolymerization.

As such a polymer containing an alkylene oxide moiety and an aromatic ring moiety in the side chain, a copolymer of styrene / maleic anhydride / the compounds of the above (1) to (3) (NOF CORPORATION) Mariarim series) etc.

Further, as the prototype, the following can be listed.

(Synthesis Example 1) CH ₂ = C (CH ₃ ) -COO
_{- (CH 2 CH 2 O)} 4.4-H ( manufactured by NOF Blemmer PE-200) 70 parts, 10 parts of styrene, acrylic acid 2
0 part was radical solution polymerized by a conventional method in a mixed solvent of ethylene glycol monomethyl ether and isopropyl alcohol to obtain a copolymer having a weight average molecular weight of about 40,000.

Of course, the present invention is not limited to the above-mentioned polymer containing an alkylene oxide moiety and an aromatic ring moiety in the side chain, but contains an alkylene oxide moiety in the main chain and an aromatic ring moiety in the side chain. A polymer or a polymer containing an aromatic ring moiety in the main chain and an alkylene oxide moiety in the side chain can also be used.

The proportion of alkylene oxide moieties in the polymer is preferably 20 to 90% in terms of molecular weight, and the proportion of aromatic ring moieties is preferably in the range of 0.01 to 30%.

As described above, the polymer containing an alkylene oxide moiety and an aromatic ring moiety in the same molecule according to the present invention has been briefly described, but it goes without saying that the polymer is not limited thereto.

The polymer containing an alkylene oxide moiety and an aromatic ring moiety in the same molecule according to the present invention is preferably contained in the ink receiving layer in an amount of 1 to 90% by weight.

If it is less than the above range, the ink absorbency is insufficient. In particular, when left in a high temperature and high humidity environment for a long time, deterioration of the recording medium itself (decrease in ink absorbency) is likely to occur. When the amount is more than the above range, deterioration (image bleeding with time and deterioration of image clarity) tends to occur when the image is left for a long time in a high temperature and high humidity environment. In addition, the transparency that can be sufficiently used as a recording sheet for OHP deteriorates.

The other components contained in the ink receiving and receiving layer are not limited as long as they are capable of receiving a so-called aqueous ink and exhibit solubility or affinity for the aqueous ink, such as polyvinyl alcohol, polyvinylpyrrolidone, Polyamide, polyacrylamide, polyethyleneimine, polyurethane, carboxymethylcellulose,
Examples thereof include synthetic resins such as polyester, polyacrylic acid, hydroxyethyl cellulose, melamine resin, and modified products thereof, and natural resins such as albumin, gelatin, casein, starch, cationized starch, gum arabic, and sodium alginate. Are not limited to these.

It is also possible to use a plurality of these simultaneously.

In the present invention, the composition containing at least a polymer containing an alkylene oxide moiety and an aromatic ring moiety in the same molecule is coated on at least one surface of the substrate to form an ink on the substrate surface. Although the recording medium has a receiving layer, various fillers and additives can be used in combination in the composition within a range not hindering achievement of the object of the present invention. Examples of the filler include silica, alumina, aluminum silicate, magnesium silicate, basic magnesium carbonate, talc, clay, hydrotalcite, calcium carbonate, titanium oxide, zinc oxide, and plastics such as polyethylene, polystyrene, and polyacrylate. Pigment, but not limited thereto. Specific examples of the additives include various surfactants, dye fixing agents (waterproofing agents), antifoaming agents, antioxidants, optical brighteners, ultraviolet absorbers, dispersants, viscosity modifiers,
Examples thereof include PH adjusters, antifungal agents, and plasticizers. These additives may be arbitrarily selected from conventionally known compounds according to the purpose.

The base material constituting the recording medium of the present invention includes high-quality paper, medium-quality paper, art paper, bond paper, recycled paper, baryta paper, cast-coated paper, cardboard paper and the like, polyethylene terephthalate and di-paper. Acetate, triacetate, cellophane, celluloid, polycarbonate, polyimide, polyvinyl chloride, polyvinyl den chloride, polyacrylate, polyethylene, film or plate made of plastic such as polypropylene, glass plate, or cotton, rayon, acrylic,
Cloths such as nylon, silk and polyester can be used. It is appropriately selected from the above-mentioned base materials depending on the recording purpose of the recording medium, the use of the recorded image, or various conditions such as adhesion to the composition coated on the upper side thereof.

In preparing the recording medium of the present invention, first, the above composition, together with other additives, if necessary, are added.
A coating solution is prepared by dissolving or dispersing in water, alcohol, or other appropriate organic solvent.

The obtained coating liquid is applied, for example, to a roll coater method, a blade coater method, an air knife coater method, a gate roll coater method, a bar coater method, a size press method, a spray coat method, a gravure coater method, a curtain coater method, etc. To coat the surface of the substrate. After that, it is dried using, for example, a hot air drying oven or a heating drum to obtain the recording medium of the present invention. Further, if necessary, a super calendar treatment or the like may be performed to smooth the ink receiving layer or increase the surface strength.

[0036] 0.2 to 50 g / m ² as the total amount The coating amount of the ink receiving layer, more preferably 1 to 30 g / m ²
Within the range of. When the coating amount is small, a part of the base material may be exposed on the surface. Also, the coating amount is 0.2 g / m
When it is less than ² , it is not effective in terms of color development of the paint as compared with the case where the ink receiving layer is not provided.
If it exceeds g / m ² , curling particularly in a low temperature and low humidity environment is remarkable, which is not preferable. When the coating amount is expressed by thickness, the coating amount is preferably in the range of 0.5 to 100 μm.

As the ink itself for carrying out ink jet recording on the recording medium described above, known inks can be used without any problems. Also, as the recording agent, a direct dye,
Water-soluble dyes typified by acid dyes, basic dyes, reactive dyes and food dyes can be used, and they can be used without particular limitation as long as they are those for ordinary inkjet recording. Such a water-soluble dye is generally used in a proportion of about 0.1 to 20% by weight in conventional inks, and the proportion may be the same in the present invention.

The solvent used in the water-based ink used in the present invention is water or a mixed solvent of water and a water-soluble organic solvent, and particularly preferable is a mixed solvent of water, a water-soluble organic solvent and water-soluble solvent. As the organic solvent, a polyhydric alcohol having an effect of preventing ink drying is contained.

The method for recording by applying the above-mentioned ink to the above-mentioned recording medium is preferably an ink jet recording method, and this method is a range which effectively separates the ink from the nozzles. Any method may be used as long as it can apply ink to the recording medium.

Particularly, in the method described in Japanese Patent Laid-Open No. 54-59936, the ink subjected to the action of thermal energy undergoes a rapid volume change, and the action force due to this state change ejects the ink from the nozzle. The inkjet method can be effectively used.

An example of an ink jet recording apparatus suitable for recording using the recording medium of the present invention will be described below. An example of a head configuration that is a main part of the apparatus is shown in FIGS.
And shown in FIG.

The head 13 is made of glass, ceramics or a plastic plate having a groove 14 through which ink passes, and is used as a heat-generating head 15 for heat-sensitive recording (a head is shown in the drawing, but is not limited to this). It is obtained by bonding and. The heating head 15 includes a protective film 16 made of silicon oxide, aluminum electrodes 17-1 and 17-.
2. A heating resistor layer 18 made of nichrome or the like, a heat storage layer 19, and a substrate 20 having a good heat dissipation property such as alumina.

The ink 21 has a discharge orifice (fine hole) 2
2, the meniscus 23 is formed by the pressure P.

Now, when an electric signal is applied to the electrodes 17-1 and 17-2, the area indicated by n of the heating head 15 rapidly generates heat, and bubbles are generated in the ink 21 in contact therewith. The meniscus 23 is projected by the pressure, the ink 21 is ejected, and the recording droplet 24 is made from the orifice 22 and is ejected toward the recording medium 25. FIG. 3 shows an external view of a multi-head in which many heads shown in FIG. 1 are arranged. The multi-head includes a glass plate 27 having multi-grooves 26, and FIG.
The heating head 28 similar to that described in FIG.

Incidentally, FIG. 1 shows the head 1 along the ink flow path.
3 is a sectional view of FIG. 3, and FIG. 2 is a sectional view taken along the line AB of FIG. 1.

FIG. 4 shows an example of an ink jet recording apparatus incorporating such a head. In FIG. 4, 61
Is a blade serving as a wiping member, one end of which is held by a blade holding member to be a fixed end, which is in the form of a cantilever. The blade 61 is arranged at a position adjacent to the recording area by the recording head, and in the case of this example, is held in a form protruding in the moving path of the recording head. Reference numeral 62 denotes a cap, which is disposed at a home position adjacent to the blade 61, and has a configuration in which it moves in a direction perpendicular to the moving direction of the recording head and contacts the ejection port surface to perform capping. Further, 63 is an ink absorber provided adjacent to the blade 61, and like the blade 61,
The recording head is held in a protruding form in the moving path of the recording head.
The blade 61, the cap 62, and the absorber 63 constitute a discharge recovery unit 64, and the blade 61 and the absorber 6
By the means 3, water, dust and the like are removed from the ink ejection port surface.

Reference numeral 65 denotes a recording head having ejection energy generating means, which ejects ink to a recording medium facing the ejection port surface on which ejection ports are arranged for recording, and 66 denotes a recording head 65 on which the recording head 65 is mounted. It is a carriage for moving the. The carriage 66 slidably engages with the guide shaft 67, and a part of the carriage 66 is connected (not shown) to a belt 69 driven by a motor 68. As a result, the carriage 66 can move along the guide shaft 67, and the recording head 65 can move the recording area and its adjacent area.

Reference numeral 51 designates a paper feeding section for inserting a recording medium, and 5
A paper feed roller 2 is driven by a motor (not shown). With these configurations, the recording medium is fed to the position facing the ejection port surface of the recording head, and as the recording progresses, the sheet discharge roller 53 is arranged and the sheet is discharged.

In the above structure, when the recording head 65 returns to the home position after the recording is completed, the cap 62 of the head recovery unit 64 is retracted from the moving path of the recording head 65, but the blade 61 projects into the moving path. There is. As a result, the ejection port surface of the recording head 65 is wiped. When the cap 62 comes into contact with the protruding surface of the recording head 65 to perform capping, the cap 62 moves so as to protrude into the moving path of the recording head.

When the recording head 65 moves from the home position to the recording start position, the cap 62 and the blade 61 are at the same position as the above-mentioned position at the time of wiping. As a result, the ejection opening surface of the recording head 65 is wiped even during this movement.

The above-mentioned movement of the recording head to the home position is performed not only at the end of recording or at the time of ejection recovery, but also at the home adjacent to the recording area at a predetermined interval while the recording head moves in the recording area for recording. The wiper is moved to the position, and the wiping is performed along with the move.

[0052]

The present invention will be described in more detail with reference to the following examples. In the text, parts and% are based on weight unless otherwise specified.

Examples 1 to 5 and Comparative Example 1 (i) Styrene / maleic anhydride / CH ₂ —C (H) —
CH ₂ O- (CH ₂ CH ₂ O) ₃ O-CH ₃ copolymer (trade name: Marialim AKM-1511 manufacturer; NOF CORPORATION), (ii) polyvinyl alcohol (trade name; PVA)
117 Maker; Kuraray), (iii) Hydrophilic acrylic resin (Durimer SP-) which is a copolymer of methyl methacrylate and an acrylic quaternary ammonium salt compound.
50 Nihon Pure Chemical Co., Ltd.) was added to 93 parts of water and 7 parts of isopropyl alcohol while stirring and mixing to dissolve.
The use ratios of (i), (ii), and (iii) are shown in Table 1. The obtained coating solution was applied to a polyethylene terephthalate film (thickness 100 μm; made by Lumirror Toray) using a wire bar so that the coating thickness after drying would be 10 μm, and then dried at 120 ° C. for 5 minutes. The present invention,
And the recording medium for comparison was prepared. On the recording medium,
Using an ink having the following composition, color recording was performed under the following conditions with an inkjet recording device that foams the ink by thermal energy to eject the ink.

Ink composition Dye 4 parts Glycerin 7 parts Thiodiglycol 10 parts Urea 5 parts Water 74 parts Dye Y: C.I. I. Direct Yellow # 86 M: C.I. I. Acid Red # 23 C: C.I. I. Direct Blue # 199 Bk: C.I. I. Food Black # 2 Recording conditions Ejection frequency: 4 KHz Ejection droplet capacity: 45 pl Recording density: 360 DPI Maximum single-color ink application amount: 8 nl / mm ²

Examples 6 to 10 (i) The copolymer obtained in Synthesis Example 1, (ii) Polyvinyl alcohol (trade name; PVA117 maker; Kuraray), (ii) Cationized polyvinyl alcohol (trade name; CM-) 318 Manufacturer; Kuraray) with water 9
5 parts and 5 parts of isopropyl alcohol were added with stirring and dissolved. Table 2 shows the use ratios of (i), (ii), and (iii). The obtained coating liquid was applied to a polyethylene terephthalate film (thickness 10
0 μm; made by Lumirror Toray), the coating thickness after drying is 15
After coating so as to have a thickness of μm, it was dried at 120 ° C. for 5 minutes to prepare recording media of the present invention and comparative recording media. In the same manner as in Examples 1 to 4, color recording was performed on the above-described recording medium by an ink jet recording apparatus that foams ink by heat energy and ejects the ink.

Example 11 In Example 1, ii) instead of polyvinyl alcohol, hydroxyethyl cellulose (trade name: Fujichemi H)
Using EC AL-15, manufacturer: Fuji Chemical,
Otherwise, the recording medium of the present invention was prepared in the same manner as in Example 1,
Color recording was done.

Example 12 In Example 5, ii) carboxymethyl cellulose (trade name: serogen P instead of polyvinyl alcohol)
R, maker: Dai-ichi Kogyo Seiyaku Co., Ltd.) was used, and the recording medium of the present invention was prepared in the same manner as in Example 5, and color recording was carried out.

Comparative Example 2 In Example 1, styrene of i) / maleic anhydride /
_{CH 2 -C (H) -CH 2} O- (CH 2 CH 2 O) 3 O-C
Polyethylene oxide (trade name: Alcox R-150, manufacturer: Meisei Kagaku) was used in place of the H ₃ copolymer, and the recording medium of the present invention was prepared in the same manner as in Example 1 except that color recording was performed. Was done.

Examples 13 and 14 The recording medium of the present invention was prepared in the same manner as in Example 1 except that art paper and fine paper were used as the base material. The following items were evaluated for the obtained color print samples.

(Evaluation Items) (1) Ink Absorbency Under the environment of 30 ° C./80%, yellow, cyan,
After recording with two full-color dots of magenta, leave it alone,
After that, when the recorded image is touched with a finger, the case where the ink does not adhere to the finger within 10 minutes, which is determined by whether the ink is taken into the ink receiving layer and does not adhere to the finger, is evaluated as follows.
The time is within Δ, and the case where it adheres even after 20 minutes has passed is marked with X.

(2) Blocking resistance In the environment of 30 ° C./80%, yellow, cyan,
Thirty minutes after recording with two full-color dots of magenta, apply PPC paper to the recording surface, then enclose it in a clear pocket file (made by Lion, polypropylene film), and in this state 40 g / cm ² The recorded image was loaded under the pressure of. At this time, it was judged whether the film and the paper could be easily separated. The case where it could be easily peeled off was marked with ◯, the ink-receiving layer that could not be peeled off was transferred to the paper, or the part of the paper that remained adhered to the recording surface was marked with x, and the middle one was marked with Δ.

(3) Image Density Solid printing (200% Dut) using the above printer
y) The image density of black (Bk) of the printed matter was evaluated using a Macbeth densitometer RD-918.

(4) The storability of the recording mediums was as follows. Each recording medium was stored in an environment of 35 ° C./90% for 7 days, then in an environment of 23 ° C./55% for 1 day, and then, It evaluated using the said printer in the environment of 23 degreeC / 55%. Ink overflow, compared to the recording medium before storage
Bleeding, thickening of characters, and markedly inferior image quality were marked with X, those without any change were marked with ○, and those in the middle were marked with Δ, in addition to the decrease in ink absorbency, the decrease in image density and Those having problems such as white turbidity (decrease in transparency) of the film were evaluated as XX.

(5) As for image unevenness, in the solid printed matter using the above printer, no uneven density is observed, and it can be visually confirmed from a distance of 50 cm between the printed matter and the eye. Was marked with x, and the middle one was marked with Δ.

(6) The image storability is determined by comparing the images recorded on the respective recording media using the above-mentioned printer with 3
After being stored in an environment of 5 ° C./90% for 7 days, the images before storage were compared and evaluated. As compared with the image before being stored, the ink was overflowed, bleeding out, and the characters were thickened, and the image quality was remarkably inferior, x, no change was observed, and medium was evaluated as Δ.

The evaluation results are summarized in Table 3.

[0067]

[Table 1]

[0068]

[Table 2]

[0069]

[Table 3]

[0070]

As described above, according to the present invention, not only the ink absorbability is excellent, the dots are clear, the optical density is high, and a high-definition image can be formed.
It is possible to supply the recording medium itself, or the recording medium with ideal required performance that does not deteriorate even if left in a high temperature and high humidity environment for a long time and has excellent storage stability of the medium itself and the image. Became.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a head portion of an inkjet recording apparatus.

FIG. 2 is a cross-sectional view of a head portion of an inkjet recording device.

3 is an external perspective view of a head in which the head shown in FIG.

FIG. 4 is a perspective view showing an example of an inkjet recording apparatus.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keiichi Suzuki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (7)

[Claims] 1. A recording medium comprising a base material and an ink receiving layer provided on at least one surface of the base material, wherein the ink receiving layer has at least the same molecule (i) alkylene oxide moiety (ii) fragrance A recording medium containing a polymer containing both ring portions as an essential component. 2. The recording medium according to claim 1, wherein the content of the polymer in the ink receiving layer is in the range of 1 to 90% by weight. 3. The recording medium according to claim 1, wherein the base material is a plastic film. 4. An ink jet recording method, wherein recording is performed on the recording medium according to claim 1 or 2 by ejecting ink from an orifice of a recording head according to a recording signal. 5. The ink jet recording method according to claim 4, wherein the liquid medium component of the ink is composed mainly of water and a water-miscible glycol or glycol ether. 6. The ink jet recording method according to claim 4, wherein the inks are cyan, magenta, yellow and black inks. 7. The ink jet recording method according to claim 4, wherein the ink is ejected by applying thermal energy to the ink.