JPH05339897A - Pigment-coated paper - Google Patents

Abstract

PURPOSE:To provide a pigment-coated paper having designability, useful for various kinds of printing and recording by various kinds of printers and moldable if a suitable base material is selected. CONSTITUTION:Designability is given by applying a coating liquid composed mainly of a resin and various kinds of pigments to a base material and fixation of ink is improved by further applying a coating liquid composed mainly of a resin excellent in fixation of ink or the resin together with spherical particles. The resultant paper can be printed by the offset printing method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pigment coated paper which is used in offset printing and has a good ink setting property.

More specifically, for example, it is not only possible to print with ordinary drying oil type inks for cards such as greeting cards which require a design effect, posters, and various packaging materials, but also various types of packaging materials. The present invention relates to a pigment-coated paper that can be recorded by a printer and that can be used for three-dimensional printed matter by using a film that can be molded on a substrate.

[0003]

2. Description of the Related Art Conventionally, a pearl pigment-coated paper suitable for offset printing is produced by an aqueous coating method. A base material is coated with a water-based pigment coating as an undercoat, and then an intermediate coating is applied with an aqueous pearl pigment coating. Japanese Patent Publication No. 1-47597, which is characterized in that a clear top coating having a water-soluble polymer substance as a main component is applied thereon.

However, in the pearl pigment layer, the pigment is used in a large amount of more than 80 parts with respect to 100 parts by weight of the resin solid content, and printing can be performed by absorbing the solvent of the ink into the base paper through the gap between the pigments. However, good offset printing cannot be obtained when a synthetic paper made of a non-absorbent plastic film is used as the base material and when plastic fine particles such as lame pigments are used as the pigment.

Even if the base material is cellulose paper, most of the surface is occupied by pigments, and even if the pigment surface is covered with resin to allow ink transfer, the solvent of the ink is not absorbed and the drying and curing are extremely slow. , When set on top of each other, set-off occurs.

Further, since pigments such as pearl pigments are more expensive than binders, it is preferable to reduce the amount of pigment blended, and it is economical to apply only one coat.

[0007]

That is, in the conventional pigment-coated paper, since the solvent absorbency of the ink is poor and the drying and curing of the ink is extremely slow, it is difficult to perform offset printing using a normal ink.

Therefore, when a porous modified layer is formed on the surface of the pigment-coated paper to impart ink absorbency to facilitate printing, the design property formed on the substrate or on the substrate is There is a problem of being damaged.

In consideration of economy, it is preferable to impart designability with at least as little pigment as possible and at the same time impart ink fixability.

Recently, there are many three-dimensional advertisements both indoors and outdoors to improve the design, and the demand for sheets that can be molded after offset printing is also increasing.

The present invention solves such problems and provides a pigment-coated paper having good ink fixability.

[0012]

SUMMARY OF THE INVENTION The present invention provides offset printing with excellent ink setting properties by providing a pigment coating layer comprising a resin and a pigment on at least one side of a substrate, and providing a surface treatment layer thereon. It is a pigment coated paper.

[0013]

As the base material of the present invention, a base material for offset printing can be used, and a synthetic paper made of cellulose paper or a plastic film is typical.

When cellulose paper is used as the base material, the type is not limited, but in consideration of the uniformity and flatness of the coating layer, coated paper such as highly smooth paper, coated paper and art paper is preferred. Is preferred.

The plastic film as the base material may be of any type as long as the surface is smooth, but a polypropylene film, a polystyrene film or a polyethylene terephthalate film is typical.

Further, thermoplastic films such as celluloid, cellulose acetate, butyl cellulose acetate, ethyl cellulose, vinyl chloride, vinylidene chloride, vinyl acetate, polystyrene, polyethylene, polyester, polypropylene, polyvinyl alcohol, polyvinyl acetal, polyisobutylene, polyamide ( Nylon), polyether, polycarbonate, fluororesin, saturated polyester resin and the like can be used for molding after printing.

Of these, polystyrene, vinyl chloride, polyethylene and polyester films are typical.

These films are transparent, translucent or opaque containing a filler such as titanium oxide, foamed to have a porous structure, and those having improved adhesion to the pigment coating layer in advance. Alternatively, a colored product or a printed product may be used.

Further, a laminating paper obtained by laminating a film and paper, or a synthetic paper obtained by coating the film can be used.

The pigment coating layer is made by mixing a resin with a pigment, and examples of the pigment include pearl pigments having a pearly luster such as natural fish scale foil, basic lead carbonate, bismuth oxychloride, and titanium mica. There are metallic pigments having metallic luster such as gold powder, silver powder, aluminum powder, and copper powder, and lame luster pigments having various colors and lusters by laminating films into small pieces.

The amount of pigment added is 2 to 80 parts, preferably 8 to 40 parts, relative to 100 parts of resin solids.

When the amount of the pigment added is less than 2 parts, gloss and appearance are deteriorated, and when it exceeds 80 parts, it is not preferable from the viewpoints of economical efficiency and surface roughness.

As the resin used for this layer, it is necessary to select a resin having good adhesion to both the base material and the surface treatment layer.

The pigment coating layer and the surface-treated layer can be applied to the entire surface of the substrate by using a roll coater, an air knife coater, or a bar coater, and can also be used for printing characters or patterns by using a gravure roll or the like. By doing so, the designability can be further enhanced, and the designability can be partially imparted.

The resin used for the pigment coating layer or the surface treatment layer is a resin having a good ink solvent absorbing property and a good ink setting property, such as acrylic resin, styrene-butadiene copolymer resin, vinyl chloride-acrylic copolymer resin, and chloride. Vinyl-vinyl acetate copolymer resin, vinyl acetate-ethylene-acrylic copolymer resin, polynorbornene resin, vinyl chloride-
Examples thereof include a mixture of an acrylic copolymer resin or a vinyl chloride-vinyl acetate copolymer resin and a saturated copolymer polyester resin.

By using these resins, the ink setting property can be improved within 1 hour, and further within about 5 to 30 minutes. These resins can be appropriately selected from commercially available resins.

Here, the acrylic resin is a polymer or copolymer of acrylic acid and its ester, acrylamide, acrylonitrile, methacrylic acid and its ester and the like.

The polynorbornene resin is commercially available, for example, from Zeon Kasei Co., Ltd. under the trade name Nosolex, and norbornene is synthesized from ethylene and cyclopentadiene by the Diels-Alder reaction and the norbornene monomer is opened. It is obtained by ring polymerization.

A mixture of the polynorbornene resin, the vinyl chloride-acrylic copolymer resin or the vinyl chloride-vinyl acetate copolymer resin and the saturated copolymer polyester resin has good blocking resistance.

Further, in order to improve the set-off, the surface treatment layer can be formed by applying a coating liquid in which spherical particles are mixed with a resin, and the spherical particles include styrene as an organic type. Examples of the inorganic particles of the system-based, benzoguanamine-based, and melamine-based polymer particles include silica and glass beads.

If an amorphous material is used, the effect of set-off prevention will be insufficient and the transparency will be inferior due to diffused reflection of light, compared with the case of using a spherical material.

The average particle size of the spherical particles is preferably in the range of 0.5 to 20 μm. If the average particle size is smaller than 0.5 μm, neither blocking between films nor settling prevention during printing will be exhibited, and if larger than 20 μm. Impairs the transparency of the film.

The amount of the spherical particles added is 0.5 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the binder resin solid content.

The binder resin forming the surface-treated layer in the case of adding the spherical particles is not particularly limited, but the resin used for the above-mentioned pigment coating layer can also be used, but a known acrylic resin is used. Resin, styrene resin,
Preferable examples are rubber resins, vinyl chloride resins, vinyl acetate resins and the like.

On the other hand, when blocking occurs, it is effective to add colloidal silica to the surface treatment layer.

Colloidal silica has a particle size of 5 × 10 ⁻³ μm.
Is a colloidal solution in which minute spherical silica of 0.1 μm is dispersed in water.

By adding this colloidal silica, heat blocking resistance, moist heat blocking resistance, scratch resistance,
Antistatic properties are also improved.

The amount of colloidal silica added should be in the range that does not impair the design effect.

As for the method of mixing the resin and the colloidal silica, the coating solution can be prepared by simply mixing and stirring, but a colloidal silica composite particle emulsion may be used.

For the purpose of further improving scratch resistance, other resin components (for example, polyester resin,
Polyvinyl chloride resin, polyvinyl acetate resin, polyvinyl alcohol, fibrin derivative, melamine resin, isocyanate cross-linked resin) may be mixed.

Further, in order to improve the running property of the film during offset printing, a small amount of filler such as silica powder may be mixed to the extent that the design effect is not impaired. The addition of this filler also makes it possible to finish the luster to a matte tone (a mild luster without glare).

When the gloss of the printed surface is desired to be high, good results can be obtained by increasing the opacity of the base material portion.

The pigment-coated paper of the present invention can be easily applied to various papers, plastic films, synthetic papers and the like by coating, and at the same time, the designability and the ink fixability can be imparted with a smaller amount of pigment than before.

The above-mentioned design is imparted to the underside of the printing surface, and it has a pearly or metallic and lame-like luster, and its unique luster and high gloss provide a beautiful high-class feeling. ..

Further, the ink fixing effect is excellent, and the printing ink setting, ink drying and ink fixing are good.

The ink set affects high speed printing and efficiency,
Even if you can print a little beautifully, the printing speed is slow because of the set-off.
If you can't stack prints, it's inefficient.

In the present invention, when a resin having good ink solvent absorption within 1 hour of ink setting time is used for the pigment coating layer, the ink is strongly retained as the ink fixing component and the solvent component in the printing ink is Since the ink is absorbed by the ink fixing component and the viscosity of the ink has risen sufficiently, the ink setting is fast, and even if the drying and curing due to the oxidative polymerization of the drying oil used as a solvent for the ink is piled up while the drying and curing are incomplete, the set-off occurs. There is nothing to do.

When spherical particles are added to the surface-treated layer, the contact area with the overlying film is reduced due to the fine irregularities, and no offset occurs.

Also, a resin having a poor ink setting property, for example, a resin having an ink setting time of 1 hour or more can be used.

Therefore, it is possible to print beautifully with offset or letterpress, and the work efficiency is improved.

By using a moldable film as the base material, molding after printing becomes possible, and it is possible to sufficiently meet the demand for enhancing the designability by making it three-dimensional.

[0052]

EXAMPLES Examples of the present invention will be described below. Parts in the text are parts by weight.

[0053]

Example 1 The following formulation was applied to one side of a substrate made of pure white polyethylene terephthalate film having a thickness of 100 μm.
The coating liquid prepared by mixing 1 was applied and dried to form a pigment coating layer having a coating thickness of 5 μm and having pearl luster.

A coating solution having the following Formulation-2 was applied on it and dried to form a surface-treated layer having a coating thickness of 6 μm.

The film was printed using an RI tester. The ink used was a process ink for paper manufactured by Toyo Ink Co., Ltd., and the volume of the ink was 0.5 cc. The ink setting time of this product was 25 minutes.

Formulation-1 Saturated copolymerized polyester resin dissolved product 100 parts (MD-1200, manufactured by Toyobo Co., Ltd.) Pearl pigment 5 parts (Iriodin # 100, manufactured by Merck Japan Co., Ltd.)

Prescription-2 Modified acrylic emulsion 100 parts (Movinyl 911, Hoechst Synthetic Co., Ltd.) Colloidal silica 60 parts (Snowtex-40, Nissan Chemical Industries Co., Ltd.) Water 50 parts

[0058]

Example 2 The following formulation was applied to one side of a substrate made of pure white polyethylene terephthalate film having a thickness of 100 μm.
The coating liquid prepared by mixing 1 was applied and dried to form a pigment coating layer having a coating thickness of 5 μm and having pearl luster.

A coating solution having the following formulation-2-2 was applied thereon and dried to form a surface-treated layer having a coating thickness of 6 μm.

The film was printed using an RI tester. As the ink, a process ink for paper manufactured by Toyo Ink Co., Ltd. was used, and the volume was 0.5 cc. The ink setting time of this product was 25 minutes.

Formulation-1 Saturated copolymerized polyester resin dissolved product 100 parts (MD-1200, manufactured by Toyobo Co., Ltd.) Pearl pigment 5 parts (Iriodin # 100, manufactured by Merck Japan Co., Ltd.)

Formulation-2-2 Colloidal silica composite particle emulsion 100 parts (LX-847A4, acrylic resin type, Hoechst Synthetic Co., Ltd.) Water 50 parts

[0063]

Example 3 A coating solution of the following formulation-3 was applied to the film surface of a base material made of synthetic paper (Peachcoat SG-135, manufactured by Nisshinbo Co., Ltd.) having an opaque layer formed on one surface having a thickness of 135 μm and dried. Then, a pigment coating layer having a metallic luster and a thickness of 5 μm was formed.

On top of that, apply a coating solution of the following formulation-4,
A surface-treated layer having a thickness of 2 μm was obtained by drying.

The film was printed using an RI tester. The ink used was a process ink for paper manufactured by Toyo Ink Co., Ltd., and the volume of the ink was 0.5 cc. The ink setting time of this product was 5 minutes.

Formulation-3 Acrylic dispersion 100 parts (Acronal YJ-2721D, manufactured by Mitsubishi Yuka Birdiche) Metallic pigment 10 parts (Alpaste 7090N, manufactured by Toyo Aluminum Co., Ltd.)

Formulation-4 Polynorbornene resin 100 parts (No Solex, manufactured by Zeon Kasei) Toluene 100 parts

[0068]

[Example 4] A coating liquid of the following formulation-5 was applied to one side of a substrate made of a non-stretched polyester film having a thickness of 300 µm and dried to form a pigment coating layer having a glossy luster and a thickness of 5 µm. did.

On top of that, apply a coating solution of the following formulation-6,
A surface-treated layer having a thickness of 5 μm was obtained by drying.

The film was printed using a RI tester. The ink used was a process ink for paper manufactured by Toyo Ink Co., Ltd., and the volume of the ink was 0.5 cc. The ink setting time of this product was 25 minutes.

When this printed film was molded by using a vacuum molding machine, a molded article having high gloss and lame gloss was obtained.

Prescription-5 Vinyl chloride-acrylic copolymer resin Emulsion 100 parts (Vini Blanc 270, manufactured by Nissin Chemical Industry Co., Ltd.) Lame gloss pigment 5 parts (Rainbow Flake N0.501 Crystal, manufactured by Diamond Industry Co., Ltd.)

Formulation-6 Saturated Copolyester Resin Dissolved Product 50 Parts (GXW-27 Dissolved Product, Toyobo Co., Ltd.) Vinyl Chloride-Vinyl Acetate Copolymer Resin Emargion 50 Parts (Vinibrand 240, Nisshin Chemical Industry Co., Ltd.) Water 50 Department

[0074]

[Comparative Example 1] The same pure white polyester film as in Example 1 was printed using an RI tester as it was.

When the ink setting time of this product was measured, it took 5 hours.

[0076]

[Comparative Example 2] The same operation as in Example 4 was carried out except that the formulation-6 was obtained by removing the vinyl chloride-vinyl acetate copolymer resin from the formulation-6.

The film was printed using an RI tester. The ink used was a process ink for paper manufactured by Toyo Ink Co., Ltd., and the volume of the ink was 0.5 cc. When the ink setting time of this product was measured, it took 5 hours.

Formulation-7 Saturated copolyester resin dissolved product 50 parts (GXW-27 dissolved product, Toyobo Co., Ltd.) Water 50 parts

[0079]

[Embodiment 5] Synthetic paper having a thickness of 360 μm (Peach coat W
On one surface of a base material made of GA-370, manufactured by Nisshinbo Co., Ltd., a coating solution of the following formulation-8 was applied and dried to form a pigment coating layer having a coating thickness of 5 μm and having a pearlescent luster. The ink setting time was 1 hour or more.

On top of that, apply a coating solution of the following formulation-9,
A surface-treated layer having a coating thickness of 5 μm was formed by drying.

Formulation-8 Acrylic dispersion 100 parts (Acronal YJ-2721D, manufactured by Mitsubishi Yuka Birdiche Co., Ltd.) Colloidal silica 60 parts (Snowtex-40, manufactured by Nissan Chemical Industries, Ltd.) Pearl pigment 15 parts (Iriodin # 100, (Merck Japan)

Formulation-9 Acrylic emulsion 100 parts (Movinyl 727, manufactured by Hoechst Synthetic) Water 50 parts Colloidal silica 60 parts (Snowtex-40, manufactured by Nissan Chemical Industries, Ltd.) Silica micro beads 2 parts (P-1500, catalytic conversion) (Made by Kogyo Co., average particle size 5 μm)

This was printed using an RI tester,
When a set-off test was conducted, there was no set-off of the ink.

In the above test, the ink used was a process ink for paper manufactured by Toyo Ink Co., Ltd., and the volume was 0.6 c.
c.

In the set-off test, the same paper as the base material used immediately after printing was laid on the printing surface to obtain 600 g / m ² / s.
After applying an ec weight and leaving it to stand overnight, the method was carried out by the method of observing the degree of adhesion of the ink to the paper.

When the printed film was molded using a vacuum molding machine, a molded product having high gloss and pearl luster was obtained.

[0087]

Example 6 Synthetic paper having a thickness of 360 μm (Peach coat W
A coating solution of the following formulation-12 was applied to one surface of a base material made of GA-370, manufactured by Nisshinbo Co., Ltd., and dried to form a pigment coating layer having a thickness of 5 μm.

A coating solution of the following formulation-13 was applied on it,
A surface-treated layer having a coating thickness of 5 μm was formed by drying.

Prescription-12 Acrylic-styrene emulsion 100 parts (Movinyl 880, Hoechst Synthetic Co., Ltd.) Colloidal silica 60 parts (Snowtex-40, Nissan Chemical Industries, Ltd.) Metallic pigment 5 parts (Alpaste 7090N, Toyo Aluminum Co., Ltd.) )

Formulation-13 Vinyl Chloride-Vinyl Acetate Copolymer Emulsion 100 parts (Vinibrand 240, Nissin Chemical Industry Co., Ltd.) Water 50 parts Colloidal silica 50 parts (Snowtex-20L, Nissan Chemical Co., Ltd.) Crosslinked polystyrene 3 Part (Fine Pearl PB-3006W, manufactured by Sumitomo Chemical Co., Ltd., average particle size 6 μm)

When this film was subjected to the same set-off test as in Example 5, no set-off was observed.

[0092]

Example 7 Synthetic paper having a thickness of 360 μm (Peach coat W
A coating solution of the following formulation-14 was applied to one surface of a base material made of GA-370, manufactured by Nisshinbo Co., Ltd., and dried to form a pigment coating layer having a thickness of 5 μm.

On top of that, apply a coating solution of the following formulation-15,
A surface-treated layer having a coating thickness of 5 μm was formed by drying.

Formulation-14 Acrylic Dispersion 100 parts (Acronal YJ-2721D, Mitsubishi Yuka Birdiche Co., Ltd.) Colloidal silica 60 parts (Snowtex-40, Nissan Chemical Industries, Ltd.) Pearl pigment 20 parts (Iriodin # 100, (Merck Japan)

Formulation-15 Acrylic-styrene emulsion 100 parts (Movinyl 728, Hoechst Synthetic Co., Ltd.) Colloidal silica 60 parts (Snowtex-C, Nissan Chemical Industries, Ltd.) Water 50 parts Glass beads 4 parts (Toshiba Microbeads MB- 10, manufactured by Toshiba Ballotini, average particle size 6 μm)

When this film was subjected to the same set-off test as in Example 5, there was no set-off at all.

[0097]

As described above in detail, the pigment-coated paper to which the present invention is applied has an ink composition for various printings, while having a design property such as pearl luster, metallic luster, and lame luster in whole and in part. The setting, ink drying, and ink fixing were good, and the workability of offset printing and letterpress printing was significantly improved.

Therefore, the pigment-coated paper of the present invention is used as a packaging material for packaging various cards such as greeting cards which are required to have a design effect, posters, toys, stationery, daily necessities, foods, medicines and the like. Also, it is possible to perform molding by selecting the film of the base material, and it is possible to further enhance the designability by making a three-dimensional printed matter.

Further, the amount of pigment used is small, which is economical.

Claims (7)

[Claims] 1. A pigment-coated paper for offset printing having excellent ink setting properties, which comprises a pigment-coated layer comprising a resin and a pigment on at least one side of a substrate, and a surface-treated layer provided thereon. 2. The paper according to claim 1, wherein the ink setting time is 5 to 30 minutes. 3. The resin used for the pigment coating layer or surface treatment layer is an acrylic resin, a styrene resin, a rubber resin, a vinyl chloride resin, a vinyl acetate resin, a polynorbornene resin, a vinyl chloride resin.
The paper according to claim 2, wherein the paper is selected from saturated copolyester mixed resins, and the pigment is selected from pearl pigments, metal pigments and glitter luster pigments. 4. The paper according to claim 3, wherein the pigment coated layer has 2 to 80 parts by weight of the pigment added to 100 parts by weight of the resin solid content. 5. A pigment coating layer comprising a resin and a pigment is provided on at least one surface of a base material, and an average particle size of 0.5 to 2 is provided thereon.
A pigment-coated paper for offset printing, which is provided with a surface treatment layer containing 0 μm spherical particles and has excellent ink setting properties. 6. The paper according to claim 5, wherein the spherical particles are organic polymer particles, silica particles, and glass particles. 7. The paper according to claim 6, wherein the pigment-coated layer has 2 to 80 parts by weight of the pigment added to 100 parts by weight of the resin solid content.