JPH11277924A - Printed matter with water-repellent overprint layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed matter provided with an overprint varnish layer with excellent water repellency and light resistance. SOLUTION: A base material sheet, a printing ink film provided on a part of this base material sheet and constituting an information wherein a conceptional driving type recognition is possible and a transparent overprint layer provided by covering a printed face contg. this printing ink film are provided. This overprint layer is constituted of an overprint varnish compsn. contg. fluororesin particles and an ultraviolet absorbent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a printed matter having an overprint layer, and more particularly to a printed matter having an overprint layer having excellent water repellency and light resistance.

[0002]

2. Description of the Related Art In general, a printed surface is coated with an overprint varnish (hereinafter sometimes referred to as an "OP varnish") to improve the gloss of a printed material and to protect a film of the printed material. ing. That is, after printing each color of printing ink (yellow, red, indigo, black, etc.) on the base sheet, a transparent OP varnish is printed on the printed material. But,
In the conventional OP varnish, when a drink such as coffee or juice spills on a printed matter, dirt adheres to the surface and stickiness remains on the printed matter. In addition, conventional OP varnishes have insufficient water repellency and light resistance, so that when they are placed in an outdoor environment for a long period of time, such as in posters, or exposed to the weather, the coating of printed matter may be attacked. . Furthermore, ordinary OP varnishes do not always have sufficient resistance to heat and scratches.

As a countermeasure against these problems, conventionally, a polyethylene wax or a silicon-based additive has been added to an OP varnish, but a satisfactory result has not always been obtained.

[0004]

Accordingly, an object of the present invention is to provide a printed material protected by an OP varnish layer having excellent water repellency and light fastness.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a base sheet and information provided on a part of the base sheet and which can be recognized as a concept-driven type are constructed. A printing ink film to be provided, comprising a transparent overprint layer provided to cover the printing surface including the printing ink film,
A printed matter having a water-repellent overprint layer, wherein the transparent overprint layer is composed of an overprint varnish composition containing fluororesin particles and an ultraviolet absorber.

In the present invention, the fluororesin particles are contained at a ratio of 20 to 400% by weight based on the solid content of the overprint varnish composition.
1 based on the solid content of the overprint varnish composition
Preferably, it is contained in an amount of at least% by weight. In the present invention, the volume average particle diameter of the fluororesin particles is 0.1
It is preferably from 10 to 10 μm.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The OP varnish composition provided on the printing surface of a printed material according to the present invention is characterized in that the OP varnish contains fluororesin particles and an ultraviolet absorber. O of the present invention
In the P varnish composition, the fluororesin acts as a substance that imparts water repellency, and can also impart abrasion resistance. The fluororesin is included in the OP varnish composition of the present invention in the form of particles. The fluororesin used in the present invention includes O
Desirable are those which do not dissolve in the solvent of the P varnish and can be uniformly dispersed as particles. Specifically, polytetrafluoroethylene resin (hereinafter, may be abbreviated as “PTFE”),
Polychlorotrifluoroethylene resin, polyhexafluoropropylene resin, ethylene-fluoroethylene copolymer resin, tetrafluoroethylene-hexafluoropropylene copolymer resin, polyperfluoroalkoxy resin, and the like can be used. Among them, PTFE is particularly preferred.

In the present invention, the particle size of the fluororesin particles is represented by a volume average particle size obtained by a laser diffraction method, a Coulter counter method or the like well known in the art. In the present invention, the fluororesin particles preferably have a volume average particle size of 0.1 to 10 μm. Fluororesin particles exhibit particularly excellent water repellency in these particle size ranges. The volume average particle size of the fluororesin particles is 2 to 5 μm.
Is more preferable. If the volume average particle size of the fluororesin particles is 2 μm or more, the fluororesin particles project onto the OP varnish film without being buried in the OP varnish film,
When the volume average particle size is 5 μm or less, the OP of the fluororesin particles is improved.
The dispersibility in the varnish is higher, the fluidity is further improved, and the fluororesin particles hardly deposit on the printing plate or blanket. 45 of the total fluororesin particles used
It is particularly preferred that the particles by weight or more have a volume average particle size of 2 to 4 μm.

Further, the fluororesin particles are used in a proportion of 20 to 400% by weight based on the solid content of the entire OP varnish composition (excluding the fluororesin particles; the same applies in the present specification).
It is blended into a varnish composition. If the content of the fluororesin particles is less than 20% by weight with respect to the solid content, water repellency, wiping properties, and abrasion resistance cannot be sufficiently obtained, while the content of the fluororesin particles is 400% by weight based on the solid content. %, The piling resistance and the leveling property become insufficient. More preferably, the fluororesin particles are added to the OP varnish composition at a ratio of 20 to 120% by weight based on the solid content.

In the present invention, the above-mentioned solid content of the OP varnish composition may be adjusted to the room temperature (20%) contained in the OP varnish composition of the present invention.
° C), and more specifically, it is composed of various resins and drying oil blended as a vehicle, excluding the solvent component and the ultraviolet absorber described in detail below.

The ultraviolet absorber to be added to the OP varnish composition of the present invention imparts light resistance to the OP varnish composition, and a benzotriazole-based ultraviolet absorber can be preferably used. Examples of such a benzotriazole-based ultraviolet absorber include 2- (5-methyl-2).
-Hydroxyphenyl) benzotriazole, 2- [2
-Hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2-
(3,5-t-butyl-2-hydroxyphenyl) benzotriazole, 2- (3-t-butyl-5-methyl-
2-hydroxyphenyl) benzotriazole, 2-
(3,5-di-t-butyl-2-hydroxyphenyl)
-5-chlorobenzotriazole, 2- (3,5-di-
t-amyl-2-hydroxyphenyl) benzotriazole, 2- (2′-hydroxy-5′-t-octylphenyl) benzotriazole, methyl-3- [3-t-
Butyl-5- (2H-benzotriazol-2-yl)
-4-hydroxyphenyl] propinate and polyethylene glycol (molecular weight: about 300), hydroxyphenylbenzotriazole derivatives and the like. These ultraviolet absorbers are all commercially available.

The ultraviolet absorber is added in an amount of 1% by weight or more, preferably 1 to 100% by weight, based on the solid content of the overprint varnish composition. If the amount of the ultraviolet absorber is less than 1% by weight, sufficient light resistance may not be obtained. More preferably, the ultraviolet absorber is added at a ratio of 20% by weight or less.

The OP varnish composition of the present invention can be applied by an offset printing method, a gravure printing method, a silk screen method, or the like. The applied OP varnish composition forms a substantially colorless and transparent film after drying.

In the case of coating by the offset printing method, the OP varnish composition of the present invention comprises a rosin-modified phenol resin, a petroleum resin, an alkyd resin, or a dry oil-modified resin, except for the fluororesin particles and the ultraviolet absorber. Resin 20 ~
80% by weight, dry oil such as linseed oil, tung oil, soybean oil 0-8
0% by weight, 0 to 80% by weight of a solvent such as normal paraffin, isoparaffin, aromatic hydrocarbon, naphthene, α-olefin or a mixture thereof, and 1 to 5% by weight of additives such as a dryer and a drying inhibitor (fluororesin) Excluding the particles and the ultraviolet absorber, the total amount is preferably 100% by weight). More preferably, 0.3 to 4 parts by weight of a drying oil is blended with respect to 1 part by weight of the resin.

[0015] When applied by a gravure printing method, the OP varnish composition of the present invention comprises an acrylic resin, a vinyl chloride-vinyl acetate copolymer resin, a polyester resin, a urethane resin, excluding fluororesin particles and an ultraviolet absorber. At least one resin selected from the group consisting of chlorinated polyolefin resins, chlorinated rubber resins, ethylene-vinyl acetate copolymer resins, polyamide resins and cellulose resins;
%, And 50 to 80% by weight of a solvent such as toluene, ethyl acetate, isobutyl acetate, methyl ethyl ketone, and methyl isobutyl ketone (100% by weight excluding fluororesin particles and an ultraviolet absorber).

The printed matter of the present invention is one in which a printing ink film constituting information that can be recognized as a concept driven type is formed on at least a part of a base sheet. As the base sheet, any sheet can be used as long as it is sheet-shaped and has printing ink receptivity. Among them, paper mainly composed of pulp, plastic film mainly composed of synthetic resin, or synthetic resin Synthetic paper or the like containing a resin as a main component and having improved printing ink receptivity can be preferably used.

As the paper containing pulp as a main component, for example, waste paper, medium quality paper, high quality paper and the like can be used. As the synthetic paper, for example, one obtained by applying a printing ink receptive paint on one or both sides of a nonporous plastic film and forming a coating film thereof to improve the printing ink receptivity can be used. As such a plastic film, for example, a polyvinyl chloride film, a polyethylene film, a polypropylene film, a polyester film and the like can be exemplified. As the printing ink receptive paint, a material containing a matting agent can be used. As a matting agent,
Silica, calcium carbonate, barium sulfate and the like can be used.

Further, as synthetic paper, a plastic film is formed by foaming a plastic film to form a large number of fine holes, and the printing ink receptivity is improved by the fine holes, and a plastic film formed by mixing a solvent-soluble fine powder. The fine powder is dissolved and removed from the film with a solvent, and the fine powder is used to improve the printing ink receptivity by using the fine powder as a fine hole. A film in which a film is stretched and a fine crack is generated between the fine powder and the plastic by the stretching, and the printing ink receptivity is improved by the fine crack can be applied.

A base sheet having on its surface a coating layer in which a clay material is dispersed in a synthetic resin binder can also be used. As such a clay material,
Examples of the synthetic resin binder include polyolefins such as polyethylene and polypropylene, and various synthetic resins such as polyvinyl chloride, polyvinyl acetate, and vinyl chloride-vinyl acetate copolymer. In the case where a polyolefin is used as the synthetic resin binder, it is desirable to increase the adhesion to the OP varnish of the present invention by oxidizing the polyolefin on the surface of the coating layer. As the oxidation treatment, corona discharge treatment, flame treatment, ozone treatment and the like can be used. It is desirable that the coating layer has a flat surface.

Such a coating layer may be provided on the side on which the overprint layer is formed, and need not necessarily be provided on both sides of the base sheet. As the printing ink film formed on the substrate sheet, a film according to a well-known printing technique can be applied. For example, printing ink film by silk screen printing, printing ink film by offset printing, printing ink film by letterpress printing, printing ink film by gravure printing, printing ink film by gravure offset printing, etc. It may be a multi-layered printing ink film overprinted with printing ink.

Such a printing ink film does not need to be provided on the entire surface of the base material sheet, but may be provided on a part of the base material sheet in a shape which forms visible information which can be recognized as a concept driven type. Here, the concept-driven perceivable visible information means that the above information is perceived based on existing knowledge possessed by the visible information observer, and is based solely on the stimulus-driven perception (for example, Unlike decorative patterns such as wood grain patterns, etc., the shape of the printing ink film has a meaning and can recognize this meaning. It mainly means letters and symbols (for example, means telephone and mail) Signs, symbols used in weather maps that signify sunny or rainy weather, signs indicating copyright or trademark rights, railroad symbols and contour lines used in maps, photographs of celebrities such as entertainers, etc.), or the layout of buildings These are various codes, lines, and the like used in the drawings, and usually embody the value of the printed matter.

The OP varnish composition of the present invention is applied so as to cover a printing surface including a printing ink film by the above printing method. Usually, the thickness of the OP varnish layer is about 0.5 to 1.5 μm, although it depends on the printing method.

In the present invention, polyolefin particles or silica particles may be used instead of the fluororesin particles. As the polyolefin particles, low-density polyethylene particles, high-density polyethylene particles, medium-density polyethylene particles, polypropylene particles, polybutene particles, polypentene particles, or particles composed of a copolymer thereof can be used, also without harm Copolymer particles obtained by copolymerizing a small amount of a monomer other than the olefin with the olefin monomer within the range can also be used.
Among these, polyethylene particles are preferred. The average volume particle size is preferably from 1 to 30 μm. The silica particles preferably have an average volume particle size of 1 to 40 μm.

[0024]

Next, the present invention will be described by way of examples. In addition,
In the following examples, “%” is based on weight. Examples 1 to 9 and Comparative Examples 1 to 5 Since the resin was solid, it was dissolved with a solvent and a drying oil to make it easy to use. That is, rosin-modified phenolic resin 4
0%, tung oil 40% and No. 3 solvent (Nippon Petrochemical Co., Ltd. solvent) 20% were charged into a four-necked flask with stirring, dissolved at 180 ° C. for 1 hour, and extracted varnish (hereinafter referred to as varnish A). Was prepared.

In varnish A, PTFE particles (FT wax FT-301 manufactured by Seishin Enterprise Co., Ltd.) having a volume average particle size of 3.9 μm as fluororesin particles and 2 as an ultraviolet absorber
-(3,5-t-butyl-2-hydroxyphenyl) benzotriazole was mixed at the ratio shown in Table 1 below, and thoroughly dispersed and kneaded with a three-roll mill, followed by 0.3% by weight of a cobalt naphthenate dryer. 0.3% by weight of cobalt naphthenate dryer, 0.3% of manganese naphthenate dryer
And 1% by weight of a drying inhibitor (Table 1 omits the amounts of the dryer and the drying inhibitor).

TK high echo yellow (C.I.
I. Pigment No. 12) Each OP varnish was applied to the coated paper underprinted in the form of letters, and the light resistance was evaluated by the light resistance test at the time when the underprint yellow ink faded by 80%.

Further, 0.3 cc of each OP varnish was applied to a color-developing machine (R
I tester), and the coated paper was left at room temperature for 24 hours, and then subjected to a water repellency test as follows. One drop of commercially available coffee was dropped on the printed matter, and after one minute, the stickiness of the printed matter when wiped off with a cloth was evaluated based on the following five-grade criteria.

5: excellent; 4: good; 3: normal; 2: slightly poor; 1: poor. The results are also shown in Table 1.

[0029]

[Table 1]

[0030]

As described above, according to the present invention, a printed matter provided with an overprint varnish layer having excellent water repellency and light fastness is provided.

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[Procedure amendment]

[Submission date] February 8, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Continuation of front page (72) Inventor Hideki Hasegawa 2-3-113 Kyobashi, Chuo-ku, Tokyo Toyo Ink Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. A base sheet, a printing ink film provided on a part of the base sheet and constituting information that can be recognized as a concept driven type, and a printing surface including the printing ink film. Provided with a transparent overprint layer provided, the transparent overprint layer, a water-repellent overprint layer characterized by being composed of an overprint varnish composition containing fluororesin particles and an ultraviolet absorber Printed matter. 2. The method according to claim 1, wherein the fluororesin particles have a solid content of 20 to 40 based on the solid content of the overprint varnish composition.
2. The printed matter according to claim 1, wherein the printed matter is contained in a proportion of 0% by weight, and the ultraviolet absorbent is contained in an amount of 1% by weight or more based on the solid content of the overprint varnish composition. 3. The volume average particle diameter of the fluororesin particles is as follows:
2. The method according to claim 1, wherein the thickness is 0.1 to 10 μm.
Or the printed matter according to 2.