JPH10329417A - Ink jet recording film with improved ink fixability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording film used in the case of writing or plotting with aqueous ink by providing conditions of satisfactory fixability of the ink or particularly aqueous pigment ink, no decrease in water resistance and no stickiness of a surface for a long period, near true circle of dot shape necessary for ink jet and excellent image resolution. SOLUTION: In the recording film comprising a recording layer obtained by sequentially laminating (A) an ink receptive layer containing aqueous soluble resin, roughing forming agent and crosslinker and (B) a dot shape regulator containing layer, at least two synthetic silicas having different oil absorption amounts are used as the forming agent in (A), and using amounts of them are altered to regulate the recording layer to 20 to 100 times of standard wiping times and 5 min or less of ink fixing time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel ink jet recording film, and more particularly, to an ink jet recording film having good fixability of an aqueous ink, particularly an aqueous pigment ink, and excellent water resistance. .

[0002]

2. Description of the Related Art In recent years, with the widespread use of computer technology, materials created by computers have been frequently printed out using a printer or the like. Printers used at this time include dot impact printers, laser printers, thermal printers, and inkjet printers.However, there is almost no mechanical noise at the time of printout, and the running cost associated with printout is low. Printers are often used. Normally, plain paper and coated paper are often used as the paper used when using this ink jet printer.However, an ink receiving layer made of a hydrophilic polymer substance is provided on the surface of a base film made of a plastic film. The provided recording film came to be used.

[0003] By the way, as an ink receiving layer provided on this substrate film, a layer made of polyvinyl alcohol and polyvinylpyrrolidone (Japanese Patent Publication No. 6-427) has heretofore been used.
Japanese Patent Application Laid-Open No. H5-262028), in which at least two ink receiving layers are provided on a support, and a polyvinyl acetal resin layer is used as the outermost layer and a water-soluble resin is used as an ink receiving layer below the polyvinyl acetal layer. Publication), a dye adsorption layer is provided on a substrate, and a swellable polymer compound is
For example, an ink receiving layer containing polyvinyl alcohol, polyvinyl acetal, and polyvinyl pyrrolidone has been proposed, such as one provided with a mixture layer of polyvinyl alcohol and polyvinyl pyrrolidone (Japanese Patent Laid-Open No. 5-286228).

However, when an ink receiving layer is formed by a combination of polyvinyl alcohol or polyvinyl acetal and polyvinyl pyrrolidone, the water absorption of the ink absorbing layer is low, the stickiness of the surface of the ink receiving layer cannot be avoided, and the ink jet recording cannot be avoided. It can sufficiently satisfy the conditions required as a recording film for use, that is, the condition that the diameter of the ink dots does not become unnecessarily large, and that the shape of the ink dots is close to a perfect circle and the periphery thereof is smooth. However, the dot shape becomes a polygonal shape, for example, a star-shaped pattern, and has a drawback that the resolution of an obtained image, that is, the sharpness of an image line is reduced.

In order to improve such disadvantages, (A) an ink receiving layer containing polyvinylpyrrolidone, polyvinyl alcohol or polyvinyl acetal or both, and a particulate material as a main component, and (B) a layer containing a dot shape modifier, Have been proposed (Japanese Patent Application Laid-Open No. 8-156396), but they are not yet satisfactory in terms of ink fixability.

[0006]

SUMMARY OF THE INVENTION The present invention overcomes the above-mentioned drawbacks of the conventional recording film using a water-soluble ink, and has good fixability of an aqueous ink, particularly an aqueous pigment ink, and has a long life. In particular, inkjet printers and inkjet plotters that have the necessary properties for inkjet, that is, a dot shape that is close to a perfect circle and excellent image resolution, in addition to the physical properties that water resistance is not reduced and the surface is not sticky. The object of the present invention is to provide a recording film used when writing or drawing with an aqueous ink such as a pen plotter.

[0007]

The present inventors have conducted intensive studies to develop an ink jet recording film having the above-mentioned preferable properties. As a result, the ink receiving layer and the dot shape adjustment on at least one side of the base film were obtained. Ink-jet recording film composed of recording layers sequentially laminated with an agent-containing layer, using two or more kinds of synthetic silicas having different oil absorption amounts as a roughening forming agent for the ink receiving layer, and changing the use ratio thereof to improve the ink fixing property. It has been found that the object can be achieved by controlling the above, and the present invention has been completed based on this finding.

That is, according to the present invention, (A) an ink-receiving layer containing a water-soluble resin, a surface-roughening agent and a cross-linking agent, and (B) a dot-shape-controlling agent-containing layer on at least one surface of the substrate film. In the recording film having a recording layer in which are sequentially laminated, at least two types of synthetic silicas having different oil absorption amounts are used as the roughening forming agent of (A), and the amounts of these are changed to perform standard wiping of the recording layer. 20-100 times,
Characterized in that the ink fixing time is adjusted to 5 minutes or less,
An object of the present invention is to provide an inkjet recording film having improved ink fixability.

The oil absorption of the synthetic silica of the present invention is J
The measurement was performed according to IS K5101, and the standard number of times of wiping of the recording layer was determined by fixing a sufficiently moistened gauze to a peeling / slipping / scratch tester (manufactured by HEIDON, trade name: HEIDON14) and applying a weight of 323 g. The recording layer was reciprocated on the surface of the recording layer at a speed of 4000 mm / min, and the number of times that the recording layer was peeled at three places of 1 mm ² or more was confirmed. The ink fixing time was determined using a black pigment ink of Design Jet 750C manufactured by Hewlett-Packard Company. Then, lines having widths of 0.5, 1.0, and 1.5 mm were recorded, and the recording lines were pressed and rubbed with a plastic eraser [Super Erasero Zero manufactured by Xerox] in a vertical direction every one minute. This is the time until the scatter marks no longer occur.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The substrate film used in the recording film of the present invention is not particularly limited, and those conventionally used as a substrate for a recording film, for example, polyethylene terephthalate, polyethylene, polypropylene, polyamide, etc. Any of these can be selected and used, and among these, polyethylene terephthalate is particularly preferred. The thickness of the substrate film is usually 25 to 250 μm, preferably 50 to 10 μm.
The range is 0 μm.

In the recording film of the present invention, an ink receiving layer is provided on one side or both sides of the base film. If desired, the ink receiving layer may be provided in order to improve the adhesiveness between the ink receiving layer and the base film. An undercoat layer may be provided between the base film and the ink receiving layer. As the undercoat layer, a saturated polyester resin, a urethane resin, or the like is usually used, but a urethane resin is particularly preferable because of good adhesion to the ink receiving layer. The thickness of the undercoat layer is usually in the range of 0.5 to 1.5 μm.

Next, the ink-receiving layer of the present invention is a layer containing a water-soluble resin, a surface-roughening agent, and a crosslinking agent as main components. What is used as a binder in the recording film, for example, starch, cellulose, tannin,
Lignin, polysaccharides such as alginic acid and arabic gum, natural polymer compounds such as gelatin, vinyl acetate, ethylene oxide, acrylic acid, acrylamide, maleic anhydride, a polymer or a copolymer containing phthalic acid and the like, Examples thereof include those exhibiting water solubility of synthetic polymer compounds such as polyester and polyamine. Among these, polyvinyl alcohol, modified polyvinyl alcohol, polyvinyl acetal, and polyvinyl pyrrolidone are preferable because of their excellent ink receptivity and color reproducibility. The water-soluble resin of the present invention may be used alone or in combination of two or more. For example, one of polyvinyl alcohol or polyvinyl acetal, or a mixture thereof and polyvinyl pyrrolidone in a weight ratio is used. 9:
Mixing at a ratio of 1 to 5: 5 is advantageous in terms of ink receptivity and color reproducibility.

The above-mentioned polyvinyl alcohol generally has a degree of polymerization of at least 1,000, preferably from 1,000 to 300.
A range of 0 is used. When the degree of polymerization is less than 1000, the ink drying property, ink absorption property and water resistance of the film become insufficient. The polyvinyl alcohol is preferably a partially saponified or completely saponified polyvinyl acetate having a degree of saponification of 75 mol% or more, and particularly preferably a partially saponified substance having a saponification degree of 75 to 90 mol%. When the degree of saponification is less than 75 mol%, the ink absorption speed becomes low. Also, polyvinyl acetal is obtained by the reaction of polyvinyl alcohol and aldehyde,
Usually, the acetalization degree is 2 to 20 mol%, preferably 5 to 1 mol%.
5 mol% is used. The degree of acetalization is 2
If the amount is less than 20 mol%, sufficient water resistance cannot be obtained. If the amount is more than 20 mol%, the water resistance is good, but the drying property of the ink and the cross-linking property described below deteriorate.

Further, the polyvinyl pyrrolidone generally has a molecular weight of 40,000 or more, preferably 60,000.
Those having a range of 0 to 2800000 are used. When the molecular weight is less than 40,000, the ink absorption rate and receptivity become insufficient, and as a result, the drying property of the ink decreases.

In the present invention, it is preferable to add a crosslinking agent in order to further improve the water resistance of the water-soluble resin. The cross-linking agent in this case varies depending on the water-soluble resin used. When the water-soluble resin is polyvinyl alcohol or polyvinyl acetal, a cross-linking agent with urea is preferable. Urea is used in an amount of usually 4 to 12 parts by weight, preferably 5 to 10 parts by weight, based on 100 parts by weight of polyvinyl alcohol or polyvinyl acetal. If the amount is less than 4 parts by weight, the effect of improving water resistance is not sufficiently exhibited, and if it exceeds 12 parts by weight, the ink absorbency tends to decrease. The catalyst used in combination therewith is usually used in a proportion of 20 to 100% by weight based on the fibrin-reaction type crosslinking agent.

In the present invention, as the surface roughening agent in the ink receiving layer (A), synthetic silica having different oil absorptions is used.
It is necessary to use more than seeds. The average particle size of the synthetic silica is in the range of 1 to 6 μm. If this range is less than 1 μm, transparency of the film corresponding to the blending amount cannot be obtained, and if this range exceeds 6 μm, the dot shape becomes polygonal, and the reproducibility of the pattern such as an image formed by ink jet decreases. I do. From the viewpoint of image reproducibility, the preferred average particle size of the synthetic silica is in the range of 1.5 to 4 μm.

In a particularly preferred embodiment, the total amount of the synthetic silica in the ink receiving layer is in the range of 50 to 200% by weight, preferably 70 to 150% by weight, based on the weight of the water-soluble resin. Of a synthetic silica having a low oil content and a synthetic silica having a high oil absorption amount in a weight ratio of 1: 2 to 3: 1.
Is selected in the range. If the proportion of the synthetic silica having an oil absorption higher than this range is small, the ink fixing property is reduced, and if the proportion is large, the dot shape is disturbed and the transparency of the film is further reduced.

In the present invention, the ratio of the synthetic silica having a high oil absorption to the synthetic silica having a low oil absorption is adjusted so that the standard number of times of wiping of the recording layer including the ink receiving layer and the dot shape adjusting agent-containing layer is 20 times. The ink fixing time needs to be adjusted to 100 times, preferably 30 to 90 times, and the ink fixing time to 5 minutes or less, preferably 2 minutes or less. If the number of times of the standard wiping is less than 20, the recording layer is peeled off from the substrate film, and if it exceeds 100, the ink absorbency is reduced. The number of times of standard wiping is preferably 30 to 90 times from the viewpoints of ink absorption and water resistance. On the other hand, if the ink fixing time of the recording layer exceeds 5 minutes, it takes time for the ink to be fixed, and the ink is stained due to scattering. here,
Synthetic silica having a low oil absorption and synthetic silica having a high oil absorption have a considerable relationship, but synthetic silica having a low oil absorption usually has an oil absorption in the range of 50 to 150 ml / 100 g. A large amount of synthetic silica has an oil absorption of 20
It is selected from those in the range of 0 to 300 ml / 100 g.

In the present invention, in addition to the synthetic silica, other conventional roughening agents can be used if desired. Examples of such a conventional roughening agent include powders of zirconia, clay, kaolin, alumina, titania, zeolite, calcium carbonate, barium sulfate, magnesium hydroxide, calcium phosphate, glass and the like. Preferred among these are calcium carbonate powders, which do not impair the dot shape and have excellent ink absorbency. Further, as the organic particulate matter, for example, acrylic resin, urethane resin,
Examples include powders of synthetic resins such as vinyl chloride resin, benzoguanamine resin, and benzoguanamine / melamine / formaldehyde condensate. These fine particles may be used alone or in combination of two or more. In particular, it is preferable to use calcium carbonate powder in a ratio of 50 to 100% by weight with respect to the synthetic silica, because the ink drying property and the ink absorbing property are improved.

The roughening agent used in combination with the synthetic silica has an average particle size of 0.5 to 6 μm, preferably 0.8 to 6 μm.
Those having a range of 4.0 μm are preferred. If the average particle diameter is less than 0.5 μm, the ink drying property is poor, and if it exceeds 6 μm, the dot shape is difficult to become a perfect circle, and the image resolution tends to decrease.

In the present invention, the water-soluble resin, the surface-roughening agent, and the crosslinking agent are dissolved or dispersed in an aqueous medium at a predetermined ratio, respectively, to form a coating solution having a solid content of about 10 to 15% by weight. Is prepared, and then applied and dried according to a conventional method on a base film or an undercoat layer provided as required, thereby forming an ink receiving layer. On this occasion,
Various additives conventionally used, for example, surfactants, lubricants, stabilizers, and colorants can be added to the coating liquid. The thickness of the ink receiving layer is usually from 5 to 30.
μm, preferably in the range of 10 to 20 μm.

In the present invention, it is necessary to provide a dot shape adjusting agent-containing layer on the ink receiving layer thus provided. As the dot shape adjusting agent, for example, a quaternary ammonium salt type acrylic resin can be preferably exemplified. Specific examples of the quaternary ammonium salt type acrylic resin include a copolymer salt of an alkyl acrylate or an alkyl methacrylate with a dialkylamino acrylate or a dialkylaminoalkyl methacrylate. Such quaternary ammonium salt type acrylic resins are known. For example, a quaternary salt of a copolymer of butyl methacrylate and dimethylaminoethyl methacrylate having a molar ratio of 1: 1 is available as a commercial product.

In order to form the dot shape adjusting agent-containing layer,
The dot shape adjusting agent may be dissolved in an appropriate solvent, for example, alcohol or a mixture of alcohol and water, and the solution may be applied onto the ink receiving layer and then dried. At this time, the dot shape adjusting agent may be laminated on the ink receiving layer, or may be partially dissolved or impregnated in the ink receiving layer.

The coating amount of this dot shape adjusting agent is 3 to 10
The range of g / m ² is appropriate. When the coating amount of the dot shape adjusting agent is less than 3 g / m ² , the image clarity (image resolution) is insufficient, and the coating amount of the dot shape adjusting agent is 1
If it exceeds 0 g / m ² , the ink absorbency and the ink drying property tend to be reduced. This dot shape adjusting agent layer
This has the effect of forming the dot shape to be a more complete circle and further preventing ink bleeding.

Further, in the present invention, when the ink receiving layer and the dot shape adjusting agent-containing layer are provided on one surface of the substrate film, the desired surface is provided on the back surface of the substrate film, that is, the surface opposite to the ink receiving layer. Can form a mat layer or an ink receiving layer. The mat layer is formed by a binder and a matting agent.Examples of the binder include a thermoplastic resin, a thermosetting resin, a photocurable resin, and the like.Specifically, acrylic, urethane, polyester, Examples of each resin include vinyl chloride resins. As the matting agent, for example, silica, zirconia,
Clay, kaolin, alumina, titania, zeolite,
Calcium carbonate, barium sulfate, magnesium hydroxide,
Examples include inorganic powders such as calcium phosphate and glass, and synthetic resin powders such as acrylic resin, urethane resin, vinyl chloride resin, benzoguanamine resin, and benzoguanamine / melamine / formaldehyde condensate. This matting agent has an average particle size of 0.1 to 20 μm, preferably 2 to 20 μm.
A range of 10 to 10 μm is desirable. Further, when the ink receiving layer is also formed on the back surface of the base film, the same one provided on the front surface of the base film may be provided, or the other, for example, does not contain a matting agent, Alternatively, a transparent ink receiving layer containing a very small amount may be provided.

The thickness of the mat layer is advantageously in the range of 1 to 10 μm, preferably 3 to 7 μm, from the viewpoint that curl prevention and good writability are obtained. Further, the mat layer may contain those conventionally used as additives, for example, a surfactant, a lubricant, a stabilizer, and a colorant.

[0027]

The recording film of the present invention is excellent in fixability of aqueous inks, especially aqueous pigment inks, so that the problem of stains due to ink bleeding is eliminated, and the dot shape is closer to a perfect circle, so that the ink receiving ink is good. The image formed on the layer is clear, has high image resolution, and is also excellent in water resistance, so that a clear and sharp image can be obtained without bleeding or thickening of the image after the image is formed, and furthermore, in the air As the ink receiving layer does not dissolve due to moisture or hand sweat,
It has excellent performance such as excellent handling without stickiness and improved work efficiency.Especially, recording film used when writing or drawing with aqueous ink such as ink jet printer, ink jet plotter, pen plotter etc. It is suitable as.

[0028]

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples. The physical properties of the recording film were evaluated according to the following methods.

(1) Ink fixability: HEWLETT P
ACKARD Inkjet Plotter (Desi
gn Jet750C) with a black pigment ink of width 0.
5, 1.0, and 1.5 mm lines were recorded, and a plastic eraser [XERO] was written vertically on the recording line every one minute.
X Company, Super Eraser Zero], and the time until the ink scatter no longer occurs was measured and evaluated according to the following criteria. ：: Within 2 minutes △: From 2 minutes to less than 5 minutes ×: 5 minutes or more

(2) Water resistance: A sufficiently moistened gauze is fixed to a peeling / slipping / scratch tester (trade name: HEIDON14, manufactured by HEIDON), and the recording layer surface is weighed at 323 g at a speed of 4000 mm / min. The recording layer was reciprocated on the upper side, and the number of times that the recording layer was confirmed to have peeled off at 3 places of 1 mm ² or more was measured.

(3) Dot shape: The dot shape and the dot contour were visually observed with a stereoscopic microscope, and evaluated according to the following criteria. ：: The circular contour is sharp, though there is some disturbance. X: The dots are disturbed and have a polygonal shape.

(4) Printability: HEWLETT PAC
KARD inkjet plotter (Design
Jet 750C), 10 lines each having a width of 0.176 mm were printed at intervals of 0.220 mm, and the sharpness of the images and the degree of ink bleeding were evaluated according to the following criteria. ：: 9 or more lines can be identified (good) Δ: 7 to 8 lines can be identified (slightly poor) ×: Only 6 or less lines can be identified (bad)

Example 1 4 parts by weight of polyvinylpyrrolidone (molecular weight: 1280000), 6 parts by weight of polyvinyl alcohol (polymerization degree: 2,000, saponification degree: 88.0 mol%), oil absorption: 95 ml / 100
g, synthetic silica powder having an average particle size of 3.5 μm and an oil absorption of 21
0 ml / 100 g, 7 parts by weight of an equivalent mixture (weight ratio 1: 1) with a synthetic silica powder having an average particle size of 3.5 μm, urea 0.1%.
6 parts by weight, 0.2 parts by weight of ammonium chloride, 40 parts by weight of ethanol, 20 parts by weight of propylene glycol monomethyl ether and 122.2 parts by weight of water were mixed to prepare a coating liquid for forming an ink receiving layer. After a subbing layer of urethane resin having a thickness of 1.0 μm is provided on a polyethylene terephthalate film having a thickness of 50 μm, the coating liquid is applied on the subbing layer with a wire bar, and the coating liquid is applied at 130 ° C. for 5 minutes. By heating, an ink receiving layer having a thickness of about 15 μm was formed. Further, a dot shape modifier comprising 1.0 part by weight of a quaternary ammonium salt type acrylic resin [Saftomer CP-2000, manufactured by Mitsubishi Yuka Co., Ltd.], 10.0 parts by weight of ethanol and 89.0 parts by weight of water. A containing layer forming liquid was prepared, applied to the ink receiving layer, and dried to form a dot shape adjusting agent-containing layer in which the usage of the dot shape adjusting agent was 4 g / m ² . Then, on the back surface of the ink receiving layer, a mat layer forming coating composed of 20 parts by weight of a binder (acrylic copolymer resin), 10 parts by weight of a matting agent (synthetic silica powder, average particle size of 3.5 μm) and 70 parts by weight of water. The working solution was applied and heated at 130 ° C. for 2 minutes to form a mat layer having a thickness of 5 μm.
Table 2 shows the physical properties of the recording film thus obtained.

Example 2 In Example 1, calcium carbonate (average particle size: 2.0 μm) was used.
A recording film was produced in the same manner as in Example 1 except that 5 parts by weight of m) was added. Table 2 shows the physical properties of this product.
Shown in

Examples 3 to 5 In the same manner as in Example 1, except that the compositions shown in the columns of Examples 3 to 5 in Table 1 were used as the coating liquid for forming the ink receiving layer. To produce a recording film, and its physical properties were determined. Table 2 shows the results.

Example 6 In Example 2, instead of providing a mat layer on the back surface of the ink receiving layer, polyvinyl alcohol (polymerization degree 170
0, saponification degree 88 mol%) 8 parts by weight, polyvinylpyrrolidone (molecular weight 630000) 4 parts by weight, polystyrene sulfonate (manufactured by Sanyo Chemical Industries, Chemistat 6120)
1.5 parts by weight, 0.25 parts by weight of dimethylol glyoxal monourein which is a cellulose-reactive crosslinking agent, 0.2 parts by weight of ammonium chloride, 30 parts by weight of ethanol and 1 part of water
06.1 parts by weight were mixed to prepare a layer-forming coating solution, and the coating solution was applied on a subbing layer of a coating amount of 0.7 g / m ^{2 made} of urethane resin using a wire bar, C. for 5 minutes to form a recording film in the same manner as in Example 1 except that a coating layer having a thickness of 10 .mu.m was provided on one side. Table 2 shows the physical properties of the recording film thus obtained.

Example 7 In Example 2, instead of providing a mat layer on the back surface of the ink receiving layer, polyvinyl alcohol (polymerization degree 1700,
(Saponification degree: 88 mol%) 7 parts by weight, 1 part by weight of polyvinylpyrrolidone (molecular weight 630000), 2 parts by weight of polystyrene sulfonate (manufactured by Sanyo Chemical Co., Ltd., Chemistat 6120), dimethylol glyoxal monou as a cellulose-reactive crosslinking agent 0.2 parts by weight of rain, ammonium chloride 0.
1 part by weight, 20 parts by weight of ethanol, 69.66 parts by weight of water, and 0.04 parts by weight of synthetic silica (average particle size: 6 μm) were mixed to prepare a layer forming coating solution, and the coating solution was applied to a wire bar. Example 1 except that a coating amount of 0.7 g / m ² of urethane resin was applied on the undercoat layer and heated at 130 ° C. for 5 minutes to provide a coating layer having a thickness of 10 μm on one side. Similarly, a recording film was formed. Table 2 shows the physical properties of the recording film thus obtained.

Example 8 Polyvinylpyrrolidone (molecular weight: 1280000) 7.5
Parts by weight, polyvinyl alcohol (polymerization degree 1700, saponification degree 88.0 mol%) 11.2 parts by weight, oil absorption 95 ml
/ 100 g, synthetic silica powder having an average particle size of 3.5 μm
4 parts by weight, oil absorption 210 ml / 100 g, average particle size 3.
4.7 parts by weight of 5 μm synthetic silica powder, 2.4 parts by weight of calcium carbonate (average particle size: 2.0 μm), 0.45 parts by weight of urea, 0.12 parts by weight of ammonium chloride, ethanol 3
0 parts by weight, propylene glycol monomethyl ether 2
A recording film was prepared in the same manner as in Example 1 except that 0 parts by weight and 121.23 parts by weight of water were mixed.
Table 2 shows the physical properties of the recording film thus obtained.

Example 9 3.7 of polyvinylpyrrolidone (molecular weight: 1280000)
Parts by weight, 5.6 parts by weight of polyvinyl alcohol (degree of polymerization: 1700, degree of saponification: 88.0 mol%), oil absorption: 95 ml /
100 g, synthetic silica powder 5.6 having an average particle size of 3.5 μm
Parts by weight, oil absorption 210 ml / 100 g, average particle size 3.5
5.6 parts by weight of synthetic silica powder of μm, 7.5 parts by weight of calcium carbonate (average particle size 2.0 μm), 0.34 parts by weight of urea, 0.09 parts by weight of ammonium chloride, ethanol 3
0 parts by weight, propylene glycol monomethyl ether 2
A recording film was prepared in the same manner as in Example 1 except that 0 parts by weight and 121.57 parts by weight of water were mixed.
Table 2 shows the physical properties of the recording film thus obtained.

Comparative Example 1 Except that 7 parts by weight of the synthetic silica of the ink receiving layer in Example 2 having an oil absorption of 210 ml / 100 g and an average particle size of 3.5 μm was independently compounded in an amount of 7 parts by weight. A recording film was manufactured. Table 2 shows the physical properties of this product.
Shown in

Comparative Example 2 The oil absorption amount in Example 2 was 210 ml and the average particle size was 3.5 μm.
m synthetic silica 3.5 parts by weight, oil absorption 95 ml
A recording film was produced in exactly the same manner as in Example 2, except that 3.5 parts by weight of synthetic silica having an average particle size of 6.0 μm was used. Table 2 shows the physical properties of this product.

[0042]

[Table 1]

Note 1) Polyvinylpyrrolidone: molecular weight 1280 000 2) Polyvinyl alcohol: Degree of polymerization 2000, saponification degree 88.0 mol% 3) Polyvinyl acetal: Acetalization degree 8.0 mol% 4) Calcium carbonate powder: Average particle size 2 0.0 μm

[0044]

[Table 2]

From the results shown in Table 2, it can be seen that the recording film of the present invention (Examples 1 to 7) has excellent ink fixability and water resistance, a circular dot shape, a sharp outline, It can be seen that the resolution is excellent, the ink drying property is good, and the surface is not sticky. Further, since the recording films of Examples 6 and 7 were provided with a transparent ink receiving layer on the back surface, it was possible to see what was recorded with the ink receiving layer on the front surface from the ink receiving layer on the back surface.
It has an excellent effect that images on both sides can be compared.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Aku 4-11-2 Ginza, Chuo-ku, Tokyo Inside Somar Co., Ltd.

Claims (3)

[Claims] Claims: 1. At least one surface of a substrate film,
In a recording film having a recording layer in which (A) an ink receiving layer containing a water-soluble resin, a roughening forming agent and a crosslinking agent and (B) a layer containing a dot shape adjusting agent are sequentially laminated, (A)
That at least two kinds of synthetic silicas having different oil absorption amounts were used as the surface roughening forming agent, and the amount of these used was changed to adjust the standard number of wiping times of the recording layer to 20 to 100 times and the ink fixing time to 5 minutes or less. Characteristic: an ink jet recording film with improved ink fixability. 2. The mixing ratio of the synthetic silica in the ink receiving layer is 50 to 20 based on the weight of the water-soluble resin as a total amount.
2. The ink jet recording film according to claim 1, which is in a range of 0% by weight. 3. An ink jet recording film according to claim 2, wherein one kind of synthetic silica having a low oil absorption and one kind of synthetic silica having a high oil absorption are used in a range of 1: 2 to 3: 1.