JP2001071631A - Ink jet recording sheet and its applilcation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fast ink absorbing speed, small bleeding, good printing image, excellent water resistance, light resistance and scuff resistance against rain, wind and light particularly necessary in the case of outdoor application, and excellent color developability in the case of irradiating it with the light. SOLUTION: The ink recoding sheet comprises an ink receiving layer made of a water absorbable polyurethane having water absorbing capability of 100 to 2,000 wt.%, and a support for supporting the layer. In this case, the polyurethane is a composition made of an alicyclic polyisocyanate as a raw material and the support made of a woven fabric or nonwoven fabric is impregnated with the composition. This sheet can be used as a decorative sheet, advertising sheet, building sheet or a clothing sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an inkjet recording sheet having a clear printed image, excellent water resistance and light resistance, excellent scratch resistance, and excellent color development when exposed to light, and its use.

[0002]

BACKGROUND OF THE INVENTION Ink-jet printers have been rapidly spreading in recent years because they can be easily made full-color, have low printing noise, and can print images processed by a computer. Accordingly, ink jet printers are becoming faster, higher resolution, and more multicolored, and hardware technology is making considerable progress.

As for inks used in ink-jet printers, various pigment inks having high water resistance and light resistance have been developed in place of the dye inks conventionally used. The development from indoor use such as advertisement guidance, decoration, sign display boards, and various types of interiors to use for outdoor use using pigment ink has become active.

[0004] With the advancement of such printers and inks, the demand for the performance of recording sheets has become more stringent and diversified. For example, with the speeding up of printers, multi-coloring, and higher resolution, etc., recording sheets are required to have further improved performance such as faster ink absorption speed and less bleeding, and excellent color development. I have. In order to respond to such a demand for performance improvement, various ink jet recording sheets have been proposed.
Among them, an ink jet recording sheet containing polyurethane in an ink receiving layer is also being developed. For example,
JP-B-6-84099, JP-A-61-35988, JP-A-6
1-35989, JP-A-61-49882, JP-A-61-9288
No. 5, JP-A-61-92886, JP-A-9-71041, JP-A-9-76626, JP-A-9-76627, JP-A-9-99635, JP-A-9-123593 No., JP-A-10-18
No. 1188, JP-A-10-181189, JP-A-10-291362
JP, JP-A-10-291363, etc., polyurethane is used as the ink receiving layer, but in any case, the original image cannot be obtained if the water absorption of the polyurethane itself is low, or when exposed to light However, there was a problem that good color developability could not be obtained. Further, JP-A-9-39372 describes a recording medium having an ink receiving layer composed of a water-absorbing polyurethane and a cationic acrylic polymer, but increasing the content of the water-absorbing polyurethane increases the ink absorption rate. Although it is faster and an image with less bleeding can be obtained, there is a problem that water resistance is deteriorated. Further, when the polyurethane is a composition using an aromatic polyisocyanate as a raw material, there is a problem that light resistance, transparency, and coloring properties are deteriorated due to yellowing due to light.

Although it is known to add a fluorescent paint or a light dispersing agent in order to improve the color developability when exposed to light, it is known that a small amount of the fluorescent paint or the light dispersing agent is added. On the other hand, there were problems such as insufficient color developability, and conversely, if these were added in large amounts, ink absorption would be impaired, and the strength of the ink receiving layer itself would be reduced, resulting in reduced rub resistance. .

[0006] Further, a transparent and glossy recording sheet used for OHP has good color developability of an image formed by transmitted light, but has insufficient color developability for electric decoration. There is still a problem in that absorption, water resistance, and light resistance are insufficient. For this reason, the ink absorption rate is fast, the bleeding is small, the printed image is good, the water resistance, the light resistance, the abrasion resistance is excellent, and the coloring property is also excellent. The emergence of an inkjet recording sheet is desired.

Accordingly, the present inventors have conducted intensive studies to solve the above problems, and have provided an ink jet recording sheet comprising a water absorbing polyurethane as an ink receiving layer and a support for supporting the ink receiving layer. By limiting the water absorbing ability of the water-absorbing polyurethane to a specific range, it has been found that the ink-receiving layer made of the water-absorbing polyurethane can have water resistance and abrasion resistance while maintaining the water absorption rate of the ink. Was completed. Also,
It has been found that by using an aliphatic or alicyclic polyisocyanate as a raw material of the water-absorbing polyurethane, it is also possible to improve light resistance and coloring.

Further, the present inventors have found that the ink jet recording sheet according to the present invention can be used not only for conventional low-cost printed materials and printed photographs, but also for color development, water resistance, peeling properties and light resistance. By the improvement of properties, color development, etc., special use as decorative items or tablecloths for decoration, special use as decorative signs or advertisement banners for advertising, building materials or wallpaper for construction, etc., It has been found that it is useful as a garment or a cloth used as a material for the garment.

Further, the present inventors have proposed that when the material of the support is a woven or non-woven fabric capable of impregnating polyurethane,
By impregnating the entire support made of a woven or non-woven fabric capable of impregnating the polyurethane with the water-absorbing polyurethane, it has been found that it is possible to maintain water absorption speed of the ink, water resistance, and abrasion resistance, The present invention has been completed. Further, they have found that by using an aliphatic or alicyclic polyisocyanate as a raw material of the water-absorbing polyurethane to be impregnated, it is possible to improve light resistance and color development. It has also been found that such an ink jet recording sheet according to the present invention can be used for special purposes such as decoration, advertising, construction, or clothing by utilizing, for example, a woven or nonwoven fabric.

[0010]

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems associated with the prior art as described above, and the ink absorbing speed is high, the bleeding is small, the printed image is clear, and it is particularly necessary for outdoor use. Water resistance, light resistance to rain, wind, light,
It is an object of the present invention to obtain an ink jet recording sheet having excellent abrasion properties and excellent color developability when exposed to light.

[0011]

SUMMARY OF THE INVENTION An ink jet recording sheet according to the present invention comprises an ink receiving layer made of a water-absorbing polyurethane having a water absorbing capacity of 100 to 2,000% by weight, and a support for supporting the ink receiving layer. And The water-absorbing polyurethane is preferably a composition using an aliphatic or alicyclic polyisocyanate as a raw material.
In addition, the inkjet recording sheet according to the present invention can be used as a decorative sheet, an advertisement sheet, a construction sheet, or a clothing sheet composed of a sheet printed on the inkjet recording sheet by an inkjet method.

The material of the support according to the present invention is not particularly limited. When the material is a support made of a woven or nonwoven fabric that can be impregnated with polyurethane, it is made of a woven or nonwoven fabric that can be impregnated with the polyurethane. It is also possible to impregnate the entire support with a water-absorbing polyurethane. Such a water-absorbing polyurethane is preferably a composition using an aliphatic or alicyclic polyisocyanate as a raw material. Such an ink jet recording sheet can be used as a decorative sheet, an advertisement sheet, a construction sheet, or a clothing sheet, which is a sheet formed by printing the ink jet recording sheet by an ink jet method.

[0013]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the ink jet recording sheet according to the present invention will be specifically described. The ink jet recording sheet according to the present invention comprises a water-absorbing polyurethane having a specific range of water-absorbing ability and an ink-receiving layer, and a support for supporting the ink-receiving layer. Further, in the ink jet recording sheet according to the present invention, a support made of a woven or nonwoven fabric can be impregnated with a water-absorbing polyurethane having a specific range of water-absorbing ability. Support The material of the support according to the present invention is not particularly limited, and various conventionally known supports can be used. As such a support material, specifically, polyester,
Examples include resin films such as polypropylene, polyurethane, polycarbonate, cellulose triacetate, polyimide, vinyl chloride, and acrylic resin; papers, nonwoven fabrics, fiber fabrics, wood, metal plates, and glass. Also,
The material of the support may be one kind or a combination of two or more different materials. Water-absorbing polyurethane The water-absorbing polyurethane constituting the ink receiving layer of the ink jet recording sheet according to the present invention is a water-absorbing polyurethane having a specific range of water absorbing ability.

[0014] Such a water-absorbing polyurethane can be obtained by any conventionally known method such as a polyaddition reaction between a polyol and a polyisocyanate compound. Further, as long as the water-absorbing polyurethane conforms to the present invention, a commercially available water-absorbing polyurethane may be used. Water-absorbing ability of water-absorbing polyurethane The water-absorbing ability of the water-absorbing polyurethane according to the present invention is 100 to
It is 2000% by weight, preferably 150 to 500% by weight.

The water-absorbing capacity of the water-absorbing polyurethane in the present invention is defined as the weight (A) of the water-absorbing polyurethane in a non-water-absorbing state and the weight of the water-absorbing polyurethane having water absorbed in the water-absorbing polyurethane to the limit that can be retained. It means the ratio (B / A) to (B). Thus, the water absorption is 100
When the water-absorbing polyurethane of up to 2,000% by weight is used as the ink receiving layer, the ink absorbing speed and the absorbing capacity are sufficient, a clear image can be obtained without blur, the water resistance is good, and the water-absorbing polyurethane is coated on the support. When formed into a film, the surface strength and hardness are high, and the abrasion is good.

If the water absorbing capacity exceeds 2000% by weight, the strength when the water-absorbing polyurethane is coated on the support is low and the hardness is low, so that the rubbing property is reduced and
Water resistance decreases. If the water absorption capacity is less than 100% by weight, the ink absorption rate decreases and the water absorption capacity is small, so that a good printed image cannot be obtained. in this way,
By limiting the water absorbing ability of the water-absorbing polyurethane to a specific range, it is possible to maintain the water absorption rate of the ink in the ink-receiving layer made of the water-absorbing polyurethane, and to provide water resistance and abrasion resistance.

Raw material of water-absorbing polyurethane (1): Polio
The polyol as a raw material of the water-absorbing polyurethane according to the present invention has a water-absorbing ability of a water-absorbing polyurethane obtained by a polyaddition reaction with a polyisocyanate compound, of 100 to 100.
There is no particular limitation as long as it is in the range of 2000% by weight. In the present invention, a polyol having a terminal group having a hydroxyl group and having hydrophilicity is preferable. Specifically, polyethylene glycol, polyethylene glycol / polytetramethylene glycol copolymer polyol, polyethylene glycol / polypropylene glycol copolymer polyol, polyethylene Glycol adipate, polyethylene glycol / poly-ε-caprolactone copolymer polyol, and the like. These polyols can be used alone or in combination of two or more.

Raw material of water-absorbing polyurethane (2): polyiso
Cyanate As the polyisocyanate used as a raw material of the water-absorbing polyurethane according to the present invention, conventionally known polyisocyanates such as aromatic polyisocyanates, aliphatic polyisocyanates and alicyclic polyisocyanates can be used. Specific examples of the aromatic polyisocyanate include paraphenylene diisocyanate, 2-chloro-1,4-phenyl diisocyanate, 2,4-toluene diisocyanate, 2,5-toluene diisocyanate, 1,5-naphthalene diisocyanate, and the like. These derivatives are mentioned.

As the aliphatic polyisocyanate or alicyclic polyisocyanate, specifically, hexamethylene diisocyanate, isophorone diisocyanate,
4,4′-dicyclohexylmethane diisocyanate,
Examples thereof include xylylene diisocyanate and derivatives thereof. In the present invention, among these, an aliphatic polyisocyanate or an alicyclic polyisocyanate is preferable. When these are used as the raw materials of the water-absorbing polyurethane, the transparency when the obtained water-absorbing polyurethane is used as an ink receptor of an ink jet recording sheet is improved, so that the coloring property when exposed to light can be improved. Furthermore, yellowing of the receptor is prevented, and the light resistance of the ink receiving layer of the ink jet recording sheet can be improved.

The raw material of the water-absorbing polyurethane (3): The chain extender present invention, when synthesizing by reacting the water-absorbing polyurethane, in addition to the above components, within a range that does not impair the achievement of the object of the present invention, various additives You may use together. For example, when it is desired to extend the chain of the water-absorbing polyurethane, a chain extender may be added during the polyaddition reaction between the polyol and the polyisocyanate compound. As the chain extender used in the present invention, specifically, 1,4-butanediol,
Examples include low molecular weight aliphatic diols such as 1,6-hexanediol and 2,3-butanediol, and low molecular weight aliphatic triols such as glycerin, trimethylolpropane and trimethylolethane. By adding such an elongation agent, the transparency when the obtained water-absorbing polyurethane is used as a receptor for an ink jet recording sheet is improved, so that the color developability when exposed to light is improved. Ink-Receiving Layer As the water-absorbing polyurethane constituting the ink-receiving layer according to the present invention, such a water-absorbing polyurethane may be used alone, or two or more kinds of water-absorbing polyurethanes having different water absorbing capacities may be mixed. In this case, if the water-absorbing capacity of the obtained water-absorbing polyurethane is in the range of 100 to 2000% by weight, the water-absorbing polyurethane has a water-absorbing capacity of less than 100% by weight or a water-absorbing capacity of 2000% by weight.
A larger water-absorbing polyurethane may be mixed.

In the present invention, a known resin may be converted into a water-absorbing polyurethane, if desired, depending on the composition and support of the inkjet ink to be used, the intended use of the inkjet recording sheet, and the required properties of the inkjet recording sheet. It may be added to form an ink receiving layer. As such a resin, specifically, starch,
Polyvinyl alcohol, methyl cellulose, polyvinyl pyrrolidone, methyl ethyl cellulose, melamine resin,
Acrylic resin and the like can be mentioned. One or more such resins can be used, including these modified products.

When forming the ink receiving layer, if necessary, known additives such as inorganic pigments, organic pigments and resin particles may be added to form the ink receiving layer.
Specific examples of such additives include pigments such as silica, calcium carbonate, talc, titanium oxide, alumina, colloidal silica, and zeolites; and resins such as polystyrene resins, urea resins, acrylic resins, melamine resins, and urethane resins. And the like.

Further, when forming the ink receiving layer, if necessary, a known auxiliary agent may be added to form the ink receiving layer. As such an auxiliary, specifically, a thickener, a release agent, a penetrant, a wetting agent, a sizing agent, an antifoaming agent, a coloring agent, a fluorescent whitening agent, an ultraviolet absorber, a light stabilizer, Examples include an antioxidant, a preservative, an antistatic agent, a dispersant, and a pH adjuster. Forming method of ink receiving layer The ink jet recording sheet according to the present invention comprises an ink receiving layer and a support for supporting the ink receiving layer,
The method for forming the ink receiving layer on the support is not particularly limited, and a known method can be employed. For example, the above-mentioned water-absorbing polyurethane alone or in a mixture, if desired, the above-mentioned resin, additives, and auxiliaries are dissolved or dispersed in a suitable solvent to prepare a coating solution, and the support is formed. After applying, a method of drying is used. Examples of the coating method include a method using a bar coater, a roll coater, an air knife coater, a blade coater, a rod coater, or the like.

Using the above-described water-absorbing polyurethane, and additives and auxiliaries to be added as required, a sheet to be an ink receiving layer is formed by a known method such as a hot rolling method or a T-die method. The ink receiving layer may be formed on the support by a method of laminating the sheet on the support, a method of co-extruding the sheet with the support, or a method of hot-melt coating the support.

The ink-receiving layer made of such a water-absorbing polyurethane is usually formed on a support.
It may be formed while being partially impregnated on the surface of the support. The thickness of the ink-receiving layer formed in this manner may be within a range that can hold the ink, and depends on the type of the printer, the type of the ink, the printing conditions, or the use. Is preferred. Support made of woven or non-woven fabric made of water-absorbing polyurethane
When the support is made of a woven or nonwoven fabric which can be impregnated with the water-absorbing polyurethane, it is possible to impregnate the entire support made of such a woven or nonwoven fabric with the water-absorbing polyurethane.

The woven or non-woven fabric is not particularly limited as long as it can be impregnated with the water-absorbing polyurethane, and the composition of the woven fabric is, for example, plant fibers such as cotton, silk, hemp and paper. Animal fibers such as wool, carbon fibers, inorganic synthetic fibers such as glass fibers, nylon, polyethylene, organic synthetic fibers such as polyester, or composite fibers containing two or more of these different fibers, Preferably, organic synthetic fibers and plant fibers are used.

Specific examples of the composition of the nonwoven fabric include cotton,
Vegetable fiber such as silk, hemp, paper; animal fiber such as wool; inorganic synthetic fiber such as carbon fiber and glass fiber; organic synthetic fiber such as nylon, polyethylene, polyester, or two different fibers among these Composite fibers and the like are included, and organic synthetic fibers and vegetable fibers are preferable.

When the support made of such a woven or non-woven fabric is impregnated with polyurethane, the water-absorbing polyurethane preferably has a water-absorbing ability of 100 to 2,000% by weight, particularly preferably 150 to 500% by weight. . Further, such a water-absorbing polyurethane is preferably a composition using an aliphatic or alicyclic polyisocyanate as a raw material.

The thickness of the support made of such a woven or nonwoven fabric is not particularly limited, and is appropriately determined depending on the use. A known method can be adopted as a method of impregnating the entire support made of a woven or nonwoven fabric with the water-absorbent polyurethane, for example, by penetrating a coating solution containing the above-described water-absorbent polyurethane into the woven or nonwoven fabric at a low pressure. And a method of impregnating a woven or nonwoven fabric by impregnating it with a coating solution containing the water-absorbing polyurethane as described above.

The support in which the woven or nonwoven fabric is impregnated with the water-absorbing polyurethane as described above may be used so that the support itself also functions as an ink receiving layer. An ink receiving layer may be further formed on the support. In this case, as the components of the ink receiving layer, known components can be used as long as the characteristics of the present invention are not impaired. Among these, the ink receiving layer is preferably made of a water-absorbing polyurethane. This is because the adhesion between the support and the ink receiving layer is good. In particular, the water absorption capacity is 10
It is preferred to use a water-absorbing polyurethane in the range of 0 to 2000% by weight.

The ink jet recording sheet obtained by impregnating such a woven or non-woven fabric with a water-absorbing polyurethane is excellent in ink absorption speed, clarity of a printed image, water resistance, light resistance, abrasion resistance and coloring. ing. Applications The inkjet recording sheet according to the present invention as described above, as described above, or as shown in the examples below, the ink absorption speed, print image, water resistance, light resistance, abrasion, color development, etc., inkjet It satisfies all requirements for recording sheets, and can be used for various special applications in addition to the use of conventional inexpensive printed materials and printed photographs.

Specifically, it is possible to expand the use indoors in terms of improving printed images and coloring properties, and to improve water resistance, light resistance, and scratch resistance.
Outdoor applications can be expanded. Also,
Depending on the material of the support, it is possible to expand the use indoors and outdoors. As a general use, specifically, when the support is paper, it is used in copying, a computer, or the like. When the support is a resin film, it is used by an optical instrument such as a slide or OHP. .

On the other hand, as a special use of the ink jet recording sheet according to the present invention, specifically, it is used as a decorative article, a table cloth, a poster, a calendar, a place mat, a table center, a tapestry, a wallpaper, etc. for decoration. No. In addition, it can be used as an illuminated signboard, advertising banner, poster, calendar, and the like for advertisement. Furthermore, use as a building material, wallpaper, etc. for construction is also mentioned. For clothing, use for clothing such as shirts, aprons, trousers, skirts, coats and the like, and fabrics used as the material thereof can be mentioned.

In the case of an ink jet recording sheet obtained by impregnating a support made of a woven or nonwoven fabric with a water-absorbing polyurethane, a material such as a woven or nonwoven fabric is used,
Ornaments, tablecloths, posters, calendars, placemats, table centers, tapestries, wallpapers, etc.
Examples thereof include use for building materials such as posters and calendars, as wallpaper for buildings, clothing for shirts, aprons, trousers, skirts, coats and the like, and fabrics for the materials for clothing.

[0035]

The ink jet recording sheet according to the present invention has a high ink absorption speed, little bleeding, a good printed image, and water resistance to rain, wind, light, light resistance, and abrasion, which are particularly required for outdoor use. It has excellent properties and excellent coloring properties when exposed to light, and is suitable for special use indoors and outdoors.

[0036]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by these Examples.

[0037]

Example 1 (Alicyclic) polyisocyanate-based water-absorbing polyurethane having a water absorption capacity of 150% (Tecophilic SP-)
80A-150, manufactured by Thermedics), 15 g of toluene,
It was dissolved in a mixed solvent of 25 g of isopropyl alcohol and 10 g of methyl ethyl ketone, and 15 g of amorphous silica (Mizukasil P-801, manufactured by Mizusawa Chemical Industry Co., Ltd.) was added to the obtained solution.
Was mixed and dispersed to prepare a coating liquid having a solid content of 30% by weight.
This coating solution is applied to a polyester film (100 μm thick).
m; Lumirror S10, manufactured by Toray Industries, Inc.) was applied using a bar coater so that the thickness after drying was 30 μm, and dried at 100 ° C. for 2 minutes with a dryer to remove the water-absorbing polyurethane. An ink jet recording sheet to be used as an ink receiving layer was obtained.

An ink jet printer (CAMM JET CJ-7 manufactured by Roland Co., Ltd.) was added to the ink jet recording sheet.
According to 0), printing was performed at 360 dpi, and the following evaluation was performed. Table 1 shows the evaluation results. [Ink absorption speed] One minute after the end of printing, place a copy paper on the printing surface, apply a 3.3 kg load from the top, leave it for 1 minute, observe the degree of ink adhesion to the copy paper, and observe the following criteria. Was evaluated.

No ink adhered to copy paper: ○ Slight ink adhered to copy paper but did not affect image: △ Ink adhered to copy paper and did not affect image Items: × [Image] The shape of each printed dot was observed and evaluated according to the following criteria.

A clear image without any bleeding can be obtained: ○ There is slight bleeding in the details, but there is no problem in use: △ Clearly bleeding and affecting the image: × [Waterproof] printed part Was immersed in water for 1 minute, air-dried in a vertically suspended state, and peeling of the ink receiving layer and ink drop were observed, and evaluated according to the following criteria.

No peeling of the ink receiving layer and no ink drop: ○ No peeling of the ink receiving layer and slight ink drop, which does not affect the image: △ Image peeling or ink dropping of the ink receiving layer Affected: × [Lightfastness] The printed area was irradiated for 28 hours using an I-Super UV tester W type (SUV-W1, manufactured by Iwasaki Electric Co., Ltd.), and the degree of discoloration was observed and evaluated according to the following criteria. .

The same image as before irradiation without discoloration of the ink is obtained: ○ The discoloration of the ink is present in detail, but there is no problem in practical use: Δ The discoloration of the ink is observed as a whole: × [ Peelability] An acrylic resin-based pressure-sensitive adhesive tape was stuck on the printing surface, and after a load of 500 g was applied for 1 minute, peeling of the ink receiving layer and ink dropping when the tape was peeled were observed, and evaluated according to the following criteria. .

No peeling of the ink receiving layer and no ink drop: ○ A drop of ink is seen but no peeling of the ink receiving layer does not affect the image: Δ A peeling of the ink receiving layer is seen: × [coloring Properties] The color developability when light was applied from the back of the printed surface was observed and evaluated according to the following criteria.

A color vividly and vividly develops in detail: も の A color deficiency is slightly insufficient: も の A color is not seen by light exposure: ×

[0045]

Example 2 In Example 1, instead of the water-absorbing polyurethane having a water-absorbing ability of 150% (alicyclic polyisocyanate), the water-absorbing polyurethane having an absorptivity of 500% (alicyclic polyisocyanate) was used. Polyurethane (Tecogel-0500)
-V, manufactured by Thermedics Co.), and an ink jet recording sheet was obtained under the same conditions as in Example 1.

This ink jet recording sheet was evaluated by the same method and criteria as in Example 1.
Table 1 shows the evaluation results.

[0047]

Example 3 In Example 1, instead of the water-absorbing polyurethane having an absorptivity of 150% (alicyclic polyisocyanate), the water absorption of an alicyclic polyisocyanate having a water absorption of 2000% was used. Polyurethane (Tecogel-20
00-V, manufactured by Thermedics Co., Ltd.), and an ink jet recording sheet was obtained under the same conditions as in Example 1.

This ink jet recording sheet was evaluated in the same manner and in the same manner as in Example 1.
Table 1 shows the evaluation results.

[0049]

Comparative Example 1 In Example 1, instead of the water-absorbing polyurethane having a water-absorbing ability of 150% (alicyclic polyisocyanate), the water-absorbing polyurethane having an absorptivity of 35% (alicyclic polyisocyanate) was used. Polyurethane (Tecophilic HP-
An ink jet recording sheet was obtained under the same conditions as in Example 1 except that 60D-35 (manufactured by Thermedics) was used.

This ink jet recording sheet was evaluated in the same manner and in the same manner as in Example 1.
Table 1 shows the evaluation results.

[0051]

[Table 1]

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C056 EA04 EA13 FB01 FB02 FB03 FB04 FC06 2H086 BA15 BA22 BA34

Claims (7)

[Claims] 1. An ink jet recording sheet comprising an ink receiving layer made of a water-absorbing polyurethane having a water absorption capacity of 100 to 2,000% by weight, and a support for supporting the ink receiving layer. 2. The ink jet recording sheet according to claim 1, wherein the support is made of a woven or non-woven fabric that can be impregnated with polyurethane, and the support is impregnated with a water-absorbing polyurethane. 3. The ink-jet recording sheet according to claim 1, wherein the water-absorbing polyurethane is a composition using an aliphatic or alicyclic polyisocyanate as a raw material. 4. A decorative sheet comprising the inkjet recording sheet according to claim 1 or 2 and a sheet printed by an inkjet method. 5. An advertisement sheet comprising the ink jet recording sheet according to claim 1 and a sheet printed by an ink jet method. 6. An architectural sheet comprising a sheet printed by the ink jet method on the ink jet recording sheet according to claim 1. 7. A clothing sheet comprising a sheet printed by the inkjet method on the inkjet recording sheet according to claim 1.