JPH0966661A - Material to be recorded - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a material to be recorded for ink jetting with which coloring is excellent and regeneration of an image can be done even when the amount of coating of an ink accepting layer is only a little, and regeneration can be done without generating whitening at a fold when it is folded. SOLUTION: A material to be recorded is formed of a film-fibril mixed polyolefin nonwoven fabric sheet having a water absorbing quantity of 0.01-1mg/cm<2> and a Fraser air permeability of 5dm<3> /m<2> /sec. or lower as a base material. On at least one face of the nonwoven fabric sheet, an ink accepting layer is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel recording material using a special base material, more specifically, excellent ink absorbency and color reproducibility, and whitening at folds when folded. The present invention relates to a recording material that can be restored without any problem, and is particularly suitable for applications involving drawing such as inkjet printers and inkjet plotters.

[0002]

2. Description of the Related Art In recent years, due to the widespread use of computers, it has become common to print out materials created by computers with printers. There are dot impact printers, laser printers, thermal printers, inkjet printers, etc. as printers used at that time, but there is almost no mechanical noise at the time of printout, and the running cost associated with printout in color or monochrome is low. Therefore, inkjet printers have been widely used.

By the way, plain paper or coated paper is often used as a paper when using an ink jet printer. In addition to this, an ink receiving layer made of a hydrophilic polymer substance on the surface of a base film made of a plastic film. A so-called clear type recording material provided with is also used. The printed clear recording material is projected on an image by an overhead projector and used for presentations, posters, advertisements and the like.

The ink receiving layer provided on this substrate film has been made of, for example, polyvinyl alcohol and polyvinylpyrrolidone (Japanese Patent Publication No. 6-427), synthetic amorphous silica, ZnO powder, aqueous adhesive and Those containing a cationic resin (JP-A-7-32725) have been proposed.

However, in a recording layer using a synthetic resin film as a base material, the ink is held only in the ink receiving layer, so that the spread of dots is limited to the ink receiving layer and the color developability of the color is reduced. In addition, there is a problem that if the amount of ink is increased in order to make the color clear, the ink receiving layer must be thickened to some extent according to the amount of ink. Further, in recording paper using paper or coated paper, since the ink absorbability is good, the ink is easily absorbed by the base material, the dots of the absorbed ink spread, and the reproducibility of the image becomes low. There was a problem that I could not escape.

[0006]

SUMMARY OF THE INVENTION The present invention overcomes the drawbacks of the conventional recording material and has good color development and image reproducibility even when the coating amount of the ink receiving layer is small.
Moreover, it is an object of the present invention to provide a recording material having a characteristic that when folded, it can be restored without causing whitening in the folds, and particularly used for writing and drawing on inkjet printers, inkjet plotters, etc. It was made as.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted earnest studies to develop a recording material suitable for use in an inkjet printer or an inkjet plotter, and as a result, provided an ink receiving layer on a substrate. In the recording material,
As a substrate, by using a film having specific properties-a fibril mixed polyolefin nonwoven sheet,
They have found that the object can be achieved, and have completed the present invention based on this finding.

That is, in the present invention, the water absorption amount is 0.01 to 1.
mg / cm ² and Fraser air permeability of 5 dm ³ / m ² / sec or less as a base material, a film-fibril mixed polyolefin nonwoven sheet is used as a base material, and an ink receiving layer is provided on at least one surface of this recording material. The material is provided.

The water absorption referred to here is determined by measuring the weight of a base material cut into 1 cm ² under the conditions of a temperature of 25 ° C. and a humidity of 65%. After the measurement, 50 mg of water having a water temperature of 40 ° C. is used as a base. After dropping from the upper surface of the material and after 2 minutes, excess water on the base material was wiped off with a dry paper towel, the weight of the base material containing water was measured, and it means the value obtained from the difference between the two. The water absorption of the film-fibri mixed polyolefin nonwoven sheet used in the present invention is 0.01 to 1 mg / cm.
² , preferably in the range of 0.02 to 0.06 mg / cm ² . If the amount of water absorption is less than this, the function as an ink receiving layer is reduced, and if it is more than this, the durability after receiving ink is reduced.

On the other hand, the air permeability referred to here means Fraser air permeability. The substrate used in the present invention needs to have an air permeability of 5 dm ³ / m ² / sec or less, and if the air permeability is higher than this, the ink will permeate when inkjet is performed. Recording becomes uneven.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The film-fibril mixed polyolefin non-woven sheet used in the present invention is obtained by flash-spinning a polyolefin such as polyethylene, polypropylene or an ethylene-propylene copolymer to form a fibril, which is then placed on a flat surface. It is formed by depositing while orienting to form a sheet, smoothing the surface by a method such as hot rolling, and partially fusing each fibril to form a film portion. In the present invention, this non-woven fabric sheet is formed into a thickness of 0.05 to 0.5 mm, preferably 0.1 to 0.3 mm and used as a substrate.

In the recording material of the present invention, an ink receiving layer is provided on one side or both sides of the base material. In order to improve the adhesion between the ink receiving layer and the base material, the base material may be added if desired. An easily adhesive surface treatment or an undercoat layer may be provided between and the ink receiving layer. As the surface treatment for easily adhering, a chemical method, for example, a method of treating with a concentrated sulfuric acid-potassium dichromate solution, followed by washing with water and drying, an electrical method, for example, a corona discharge treatment or a discharge such as CASING method (Belle Telephone Co., Ltd.) A treatment method or the like is used. A saturated polyester resin or urethane resin is usually used as the undercoat layer. Among these, corona discharge treatment is particularly preferable because the adhesion between the substrate and the ink receiving layer is good. Also,
Further, when the adhesion between the substrate and the ink receiving layer is required, it is preferable to provide an undercoat layer of the urethane resin after the corona discharge treatment because the adhesion between the substrate and the ink receiving layer is improved. When applying the undercoat layer, the coating amount is usually in the range of ^{3 to} 15 g / m ^{2 on} one side.

The ink receiving layer provided on at least one side of the recording material of the present invention is not particularly limited as long as it has a property of holding at least ink, and is not particularly limited, but it is a water-soluble or water-absorbing polymer compound or water-resistant. It is preferable that at least one layer mainly composed of the water-soluble polymer compound is used.

Examples of the polymer compound include 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. Polymers or copolymers containing acid, phthalic acid, etc. as constituent components, polyester,
Examples thereof include water-soluble synthetic polymer compounds such as polyamines.

Further, as the water resistant water-soluble polymer, there is a water-soluble polymer insolubilized by a reaction such as a salt bond, a coordinate bond, a covalent bond or a hydrogen bond with the water-soluble polymer. Examples of the crosslinking agent at this time include water-soluble melamine resins, isocyanate resins, and aziridine-based processed products.

In the present invention, the ink receiving layer is prepared by dissolving or dispersing a water-soluble, water-absorbing polymer or a water-resistant water-soluble polymer in an aqueous medium to prepare a coating solution, and then preparing a coating material or a substrate as desired. The ink-receptive layer is provided on the easily-adhesive surface treatment or subbing layer provided by coating and drying according to a conventional method. At this time, various conventionally known additives such as a surfactant, a lubricant, a stabilizer, and a coloring agent can be added to the coating liquid. The coating amount of this ink receiving layer is usually 30 to 180 g / m ² , and preferably 60 to 100 g / m ² .

If desired, the ink receiving layer of the present invention may contain a surface-roughening agent. An inorganic or organic surface-roughening agent is used as the surface-roughening agent.
Examples of the inorganic type include silica, zirconia, clay, kaolin, alumina, titania, zeolite, calcium carbonate, barium sulfate, magnesium hydroxide, calcium phosphate, glass and the like, and examples of the organic type include acrylic type. Examples thereof include resins, urethane resins, vinyl chloride resins, benzoguanamine resins, benzoguanamine / melamine / formaldehyde condensates.

This roughening agent has an average particle size of 0.5 to 2
A thickness in the range of 0 μm, preferably 2 to 15 μm is suitable. If this average particle size is less than 0.5 μm, the ink receiving layer surface becomes sticky, and if it exceeds 20 μm,
Color reproducibility is reduced. When the surface-roughening agent is contained in the ink receiving layer, its content is in the range of 0.1 to 20% by weight in the ink receiving layer. If it is less than this, blocking occurs, and if it is more than this, the image reproducibility deteriorates, which is not preferable.

[0019]

INDUSTRIAL APPLICABILITY The recording material of the present invention can form an image having excellent image reproducibility and color-developing property because the ink is appropriately soaked into the substrate when an image is formed, and creases are formed when the image is formed. Has the advantage that it does not bleach. Furthermore, since it is possible to form an ink receiving layer in a smaller amount than that of a conventional film-based recording material, it has excellent performance in productivity and ink drying property, and is particularly useful for inkjet printers and inkjet plotters. It is suitable as a recording film used when writing or drawing with ink such as.

[0020]

The present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto. The physical properties of the recording film were evaluated according to the methods described below.

(1) Dot shape Inkjet printer manufactured by Canon Inc. (BJC400
After printing with J, ink: BCI21), the dot shape was visually observed with a stereoscopic microscope and evaluated according to the following criteria. ○: It is circular. Δ: The shape is circular, although there is some disorder. X: It is not a circle but a polygon.

(2) Color Reproducibility Canon Inkjet Printer (BJC400
After printing with J, ink: BCI21), the reproducibility of each color was visually observed and evaluated according to the following criteria. ：: Each color is clear without bleeding. Δ: Slight bleeding but clear. X: The bleeding is severe and unclear.

(3) Ink Dryness Inkjet printer (BJC400, manufactured by Canon Inc.)
J, Ink: BCI21), after being printed with touch within 30 seconds after printing, ◯, from 30 seconds to less than 60 seconds Δ,
Others were marked with x.

(4) Water Absorption of Base Material The weight of the base material cut into 1 cm ² was measured under the conditions of temperature 25 ° C. and humidity 65%, and after the measurement, 50 mg of water having a water temperature of 40 ° C. was used as a base. After dropping from the upper surface of the material and after 2 minutes, excess water on the substrate was wiped off with a dry paper towel, the weight of the substrate containing water was measured, and the amount of water absorption was measured from the difference between the two.

Example 1 Polyvinyl alcohol (polymerization degree: 1700, saponification degree: 88)
Mol%) 7 parts by weight, polyvinylpyrrolidone (molecular weight 63
50,000) 1 part by weight, quaternary ammonium salt type styrene copolymer (manufactured by Sanyo Kasei Co., Chemistat 6120) 2
Parts by weight, 0.2 parts by weight of dimethylol glyoxal monourein, which is a fibrin-reactive cross-linking agent, 0.1 parts by weight of ammonium chloride, 20 parts by weight of ethanol, 69.66 parts by weight of water, synthetic silica (average particle size 6 μm ) 0.04 part by weight was mixed to prepare an ink receiving layer forming coating liquid.

A 0.14 mm thick film-fibril mixed type polyethylene non-woven sheet (registered trademark "Tyvek" 1025D manufactured by DuPont Japan Limited)
The amount of water absorbed is 0.05 mg / cm ² , and the air permeability is 5 dm ³ / m ² / sec or less), and the coating solution is applied to one side with a wire bar, and heated at 120 ° C. for 5 minutes to apply the amount on one side. 80 g /
A recording material was obtained by forming an m ² ink receiving layer.

Example 2 Polyvinyl alcohol (polymerization degree: 1700, saponification degree: 88)
Mol%) 8.1 parts by weight, polyvinylpyrrolidone (molecular weight 630,000) 4.05 parts by weight, quaternary ammonium salt type styrene copolymer (manufactured by Sanyo Kasei Co., Chemistat 6).
120) 1.35 parts by weight, 0.25 parts by weight of dimethylolglyoxalmonourein which is a fibrin reactive cross-linking agent, 0.2 parts by weight of ammonium chloride, 30 parts by weight of ethanol, 106.1 parts by weight of water, synthetic silica (Average particle size 6μ
m) 0.04 part by weight was mixed to prepare an ink receiving layer forming coating liquid.

A 0.14 mm thick film-fibril mixed type polyethylene non-woven fabric sheet (registered trademark "Tyvek" 1025 manufactured by DuPont Japan Limited)
On one side of D), apply the coating liquid with a wire bar,
Heat at 120 ° C for 5 minutes and apply on one side 80g / m ²
A recording material was obtained by forming the ink receiving layer of.

Comparative Example 1 A recording material was produced in the same manner as in Example 1 except that the substrate in Example 1 was polyethylene terephthalate (thickness 100 μm). Its composition is shown in Table 1, and its physical properties are shown in Table 2.

Comparative Example 2 The base material in Example 1 was used as a dry PPC paper (manufactured by Ricoh Company,
A recording film was produced in the same manner as in Example 1 except that it was used as "my paper". Its composition is shown in Table 1, and its physical properties are shown in Table 2.

[0031]

[Table 1]

[0032]

[Table 2]

From the results shown in Table 2, it can be seen that the recording materials of the present invention (Examples 1 and 2) are recording films excellent in color and image reproducibility and also in ink drying property.

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[Procedure amendment]

[Submission date] January 12, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction contents]

Example 1 Polyvinyl alcohol (polymerization degree: 1700, saponification degree: 88)
Mol%) 7 parts by weight, polyvinylpyrrolidone (molecular weight 63
50,000) 1 part by weight, polystyrene sulfonate (manufactured by Sanyo Kasei Co., Chemist 6120) 2 parts by weight, dimethylol glyoxal monoureine 0.2 part by weight, which is a fibrin reactive cross-linking agent, and ammonium chloride 0.1. Parts 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 an ink receiving layer forming coating liquid.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0027

[Correction method] Change

[Correction contents]

Example 2 Polyvinyl alcohol (polymerization degree: 1700, saponification degree: 88)
Mol%) 8.1 parts by weight, polyvinylpyrrolidone (molecular weight 630,000) 4.05 parts by weight, polystyrene sulfonate (manufactured by Sanyo Kasei Co., Chemistat 6120) 1.3.
5 parts by weight, 0.25 parts by weight of dimethylol glyoxal monourein, which is a fibrin reactive cross-linking agent, 0.2 parts by weight of ammonium chloride, 30 parts by weight of ethanol, 106.
1 part by weight and 0.04 part by weight of synthetic silica (average particle size 6 μm) were mixed to prepare an ink receiving layer forming coating liquid.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

[0031]

[Table 1]

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Claims (2)

[Claims] 1. A film-fibril mixed polyolefin nonwoven sheet having a water absorption of 0.01 to 1 mg / cm ² and a Fraser air permeability of 5 dm ³ / m ² / sec or less as a base material, and at least one surface of which is ink-receptive. A recording material having a layer. 2. The recording material according to claim 1, wherein the polyolefin is polyethylene.