JPH1180641A - Water repellent overprint vanish composition and printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overprint vanish composition having a high water- repellency, and abrasion resistance and easy to wipe out. SOLUTION: This composition comprises (A) an overprint vanish composition comprising (a1) from 20 to 50 wt.% of at least one resin selected from the group consisting of an acrylic copolymer resin, a vinyl chloride/vinyl acetate copolymer resin, a polyester resin, an urethane resin, a chlorinated polyolefin resin, a chlorinated rubber resin, an ethylene/vinyl acetate copolymer resin, a polyamide resin and a cellulose resin and (a2) from 50 to 80 wt.% solvent (B) a polytetrafluoroethylene particle having a volume average particle size of from 2 to 5 μ m at a ratio of (A) to (B) of 100 pts.wt. to from 2 to 30 pts.wt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colorless transparent to milky white overprint varnish composition having excellent water repellency and abrasion resistance.

[0002]

2. Description of the Related Art Generally, an overprint varnish (hereinafter sometimes referred to as an OP varnish) is used for improving the gloss of a printed material and protecting the film of the printed material. That is, after printing each color of printing ink (yellow, red, indigo, black, etc.), a colorless and transparent OP varnish is printed. However, when beverages such as coffee and juice spilled on the printed matter, dirt adhered to the surface and the printed matter was left sticky. Further, when exposed to wind and rain like a poster or the like, the film of the printed matter may be eroded due to insufficient water repellency. Furthermore, ordinary printed matter is not always sufficient against heat and scratches.
As a countermeasure for these, conventionally, a polyethylene wax or a silicon-based additive has been used for the OP varnish, but it has not always been sufficient.

[0003]

SUMMARY OF THE INVENTION The present invention provides an OP varnish composition having excellent water repellency, wiping properties, and rub resistance.

[0004]

That is, the first invention is that the volume average particle diameter is 2 to 5 with respect to 100 parts by weight of the overprint varnish composition (A) comprising the following (a1) and (a2). A water-repellent overprint varnish composition comprising 2 to 30 parts by weight of micrometer polytetrafluoroethylene particles (B). (A1) Acrylic copolymer resin, vinyl chloride-vinyl acetate copolymer resin, polyester resin, urethane resin,
Chlorinated polyolefin resin, chlorinated rubber resin, ethylene-
At least one resin selected from the group consisting of vinyl acetate copolymer resin, polyamide resin and cellulose resin: 20 to 50% by weight (a2) Solvent: 50 to 80% by weight

According to a second aspect of the present invention, there is provided a base sheet, a printing ink film provided on at least a part of the base sheet and constituting information that can be recognized as a concept driven type, and printing including the printing ink film. A transparent overprint layer provided so as to cover the surface, wherein the transparent overprint layer is a first overprint layer.
A printed matter comprising the water-repellent overprint varnish composition according to the invention.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the particle diameter of polytetrafluoroethylene particles (hereinafter abbreviated as PTFE) wax is a volume average particle diameter obtained by a laser diffraction method, a Coulter counter method or the like. The PTFE particles have a volume average particle size of 2 to 5 micrometers, and more preferably, particles having a volume average particle size of 2 to 4 micrometers in which at least 45% by weight of all the particles are used. When the volume average particle size is less than 2 micrometers, the particles penetrate into the OP varnish film and do not protrude onto the OP varnish film, and the friction resistance deteriorates. If the volume average particle size is larger than 5 micrometers, the dispersibility of the PTFE in the OP varnish is poor and the fluidity is deteriorated, and the PTFE accumulates on the printing plate or rubber roller. PTFE is added in an amount of 2 to 30% by weight, preferably 5 to 10% by weight, based on 100 parts by weight of the total OP varnish composition (A). If the content is less than the above values, sufficient water repellency, wiping properties, and rub resistance cannot be obtained. If the content is more than the above values, the gloss is significantly reduced and the leveling property is insufficient.

The water repellent OP varnish composition of the present invention can be applied by a gravure printing method or a silk screen method. The OP varnish composition (A) for coating by the gravure printing method comprises 20 to 50% by weight of the resin (a1) and toluene, xylene, ethyl acetate, isobutyl acetate, methyl ethyl ketone, methyl isobutyl ketone,
The solvent (a2) such as ethanol, isopropanol, butanol, etc. is composed of 50 to 80% by weight.

[0008] The OP varnish composition (A) when applied by a silk screen method is prepared by using the resin 20 (a1).
And a solvent such as petroleum naphtha, methyl propylene glycol, butyl cellosolve, methyl propylene glycol acetate, diacetone alcohol, cyclohexanone, isophorone, and γ-butyl lactone (a
2) 50 to 80% by weight.

In the present invention, the resin (a1) may have various functional groups such as a hydroxyl group, a carboxyl group, an amino group and an epoxy group, and a group capable of reacting with such a functional group is contained in one molecule. The water-repellent OP varnish composition according to the present invention may contain at least one compound as a crosslinking agent.

[0010] In applying the OP varnish composition of the present invention, first, a printing ink film constituting information that can be recognized as a concept drive type is formed on at least a part of the substrate sheet. As the base sheet, any sheet may 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 A synthetic paper or the like whose main component is a printing paper having improved ink receptivity can be preferably used. As the paper containing pulp as a main component, for example, unwashed 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 above-mentioned 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. In addition, as the above-mentioned synthetic paper, a plastic film was foamed to form a number of fine holes, a film having improved printing ink receptivity by these fine holes, and a solvent-soluble fine powder were mixed to form a film. The fine powder of the plastic film is dissolved and removed with a solvent, and the portion where the fine powder is removed is used as a fine hole, and the printing ink receptivity is improved by the fine hole, or the fine powder is mixed. Stretch the coated plastic film,
By this stretching, fine cracks are generated between the fine powder and the plastic, and those having improved printing ink receptivity by the fine cracks can be applied.

It is also possible to use a base sheet having a coating layer on the surface of which a clay material is dispersed in a synthetic resin binder. Such clay materials include, for example, talc, clay, kaolin, etc., and synthetic resin binders include polyolefins such as polyethylene and polypropylene, polyvinyl chloride, polyvinyl acetate, and vinyl chloride-vinyl acetate copolymer. Various synthetic resins such as coalescence can be used. 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. The coating layer may be provided on the side on which the transparent overprint layer is formed, and need not necessarily be provided on both sides of the base sheet.

[0012] As the printing ink film formed on the base sheet, a film according to a well-known printing technique can be used. 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 sheet,
It is sufficient if a part of the information is provided in a shape that constitutes visible information that can be conceptually driven. 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 to indicate fine weather or rainy weather, symbols indicating copyright or trademark rights, railway symbols and contour lines used in maps, photographs of celebrities such as entertainers, etc.),
Or various codes, lines, and the like used in floor plans of buildings, 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 formed by the above printing method.

[0013]

Next, the present invention will be described by way of examples. In the examples, “parts” and “%” are based on weight. Examples 1 to 3 and Comparative Examples 1 to 6 22.5% of an acrylic copolymer resin mainly composed of methyl methacrylate / butyl methacrylate,
2.5% by weight of vinyl acetate copolymer resin, 37.5% of toluene
%, Isobutyl acetate 17.5%, ethyl acetate 15%, methyl isobutyl ketone 2%, methyl ethyl ketone 3% were charged into a four-necked flask equipped with a stirrer, and dissolved at 50 ° C. to obtain Varnish A. To 100 parts of varnish A, PTFE as shown in Table 1 as an additive, other waxes, silicone oil, etc. were mixed in various ratios and sufficiently dispersed with a disper.
The water repellent OP varnish composition of the present invention and the OP varnish composition of Comparative Example were obtained, each OP composition was printed on coated paper by a small gravure calibrator, and each test was performed after standing at room temperature for 24 hours.
The test methods in the table were performed as follows. Table 1 shows the results.

(Water repellency) A drop of commercially available coffee was dripped on the printed matter, and after one minute, the stickiness of the printed matter when wiped off with a cloth was indicated on a five-point scale (Excellent): 5 ← → 1
(Poor). (Friction resistance) Each printed matter was rubbed 20 times with a load of 2 lbs. Of Sutherland Lab Tester, and the degree of damage of the printed matter was indicated by a five-point scale. The display method is the same as the above water repellency.

[0015]

[Table 1]

Example 4 Acrylic resin (Paraloid B6 manufactured by Rohm and Haas Company)
6) 25%, 30% diacetone alcohol, 30% methyl propylene glycol acetate, 15% petroleum naphtha (boiling point: 160-180 ° C) are charged into a four-necked flask equipped with a stirrer, and the resin is dissolved at 80 ° C for 2 hours. And Varnish B. Varnish B: 100 parts of P used in Example 1
Five parts of TFE and 1 part of an acrylic oligomer (Polyflow 3 manufactured by Kyoeisha Chemical Co., Ltd.) were blended as a leveling agent, and the mixture was stirred with a high-speed dissolver for 30 minutes to obtain a uniformly dispersed OP varnish for screen printing having a viscosity of 46 poise. 25 parts of butyrocellosolve was added to 100 parts of the OP varnish to adjust the viscosity (viscosity: 18 poise), printed on coated paper with a 270 mesh nylon plate, and dried at room temperature for 24 hours to obtain a dry film. . The coating was evaluated for water repellency 5 and rub resistance 5 by the above test method.

Example 5 The varnish B obtained in Example 4 was mixed with 10 parts of the PTFE wax used in Example 1 as an additive and 1 part of an acrylic oligomer (polyflow 3 manufactured by Kyoeisha Chemical Co., Ltd.) as a leveling agent. By stirring with a high-speed dissolver for 30 minutes, an OP varnish for screen printing having a viscosity of 46 poise and uniformly dispersed was obtained. To 100 parts of this OP varnish, 20 parts of butyro cellosolve was added to adjust the viscosity (viscosity: 18 poise), printed on coated paper with a 270 mesh nylon plate, and dried at room temperature for 24 hours to obtain a dry film. . The coating was evaluated by the test method described above to have a water repellency of 5, abrasion resistance of 5, and an appearance having a matte effect.

Comparative Example 7 In Example 4, polyethylene wax (trade name: PW powder M201 manufactured by Toyo Petrolite Co., Ltd.) was used instead of PTFE.
0) Except for adding 5 parts, a dried film was obtained in the same manner as in Example 4. The coating was evaluated for water repellency 3 and rub resistance 3 by the above test method.

[0019]

The OP varnish composition of the present invention can improve water repellency, wiping properties and rub resistance.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaru Takahashi 1-5-1, Taito, Taito-ku, Tokyo Letterpress Printing Co., Ltd.

Claims (2)

[Claims] 1. An overprint varnish composition (A) comprising the following (a1) and (a2):
A water-repellent overprint varnish composition comprising 2 to 30 parts by weight of polytetrafluoroethylene particles (B) having a volume average particle size of 2 to 5 micrometers. (A1) Acrylic copolymer resin, vinyl chloride-vinyl acetate copolymer resin, polyester resin, urethane resin,
Chlorinated polyolefin resin, chlorinated rubber resin, ethylene-
At least one resin selected from the group consisting of vinyl acetate copolymer resin, polyamide resin and cellulose resin: 20 to 50% by weight (a2) Solvent: 50 to 80% by weight 2. A base sheet, a printing ink coating provided on at least 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 coating. And a transparent overprint layer provided thereon, wherein the transparent overprint layer comprises the water-repellent overprint varnish composition according to claim 1.