JPH028268A - Gravure ink of high brightness - Google Patents

Abstract

PURPOSE:To provide an ink, having an excellent brightness and capable of preparing printed matters of the same kind simply by printing without passing through punching steps and improve operability by dispersing metal fragments prepared by crushing vacuum deposited metal films in a resin varnish. CONSTITUTION:The objective ink obtained by vacuum deposition of a metal on a base film treated with a release agent, peeling the vacuum deposited metal layer from the base film, crushing the above-mentioned vacuum deposited metal layer, providing fragments of the afore-mentioned vacuum deposited metal and dispersing the resultant vacuum deposited metal fragments in a resin varnish for gravure ink.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to gravure ink with high brightness.

[Prior art]

Conventionally, in order to increase the brightness of gravure ink, aluminum yeast has been used as aluminum powder or a colored version thereof, and metallic gravure inks such as silver or pooled are known.

The aluminum yeast mentioned above has a flying type and a non-feeling type, and the reefing type has aluminum powder floating on the coating surface like leaves on a tree, and the non-living type has aluminum powder floating on the coating surface. In addition, for high-brightness displays that do not involve printing using ink or in combination with printing, the paper, film, or sheet on which the display is to be displayed cannot be obtained. There is also a method of performing metal vapor deposition directly on the display object, and a method of laminating a metal vapor-deposited film or sheet onto the display object.

Print-like displays using the above-mentioned metal vapor deposition can provide high-luminance, metallic-like displays, but have the drawbacks of complicated processes, high loss rates, and high costs.

For example, one method for obtaining a display object having metal vapor deposited portions only in necessary locations requires three general steps: a printing process, a vapor deposition process, and a lamination process, which is inefficient and increases costs. Another method known is a punching method in which the entire surface is vapor-deposited, leaving only the necessary parts and removing unnecessary parts, but this also has the disadvantage of being a complicated process and high cost. There is.

[Problem to be solved by the invention]

To provide a high-brightness gravure ink that is much superior to metallic inks using aluminum paste or aluminum powder, that is, a high-brightness gravure ink that is almost as bright as a laminate of vapor-deposited metal or vapor-deposited metal foil.

[Means to solve the problem]

The object of the present invention is to perform metal vapor deposition on a base film treated with a release agent, peel the vapor-deposited metal layer from the base film, and completely crush the vapor-deposited metal layer to obtain vapor-deposited metal pieces.
This is achieved by dispersing the vapor-deposited metal flakes in a retentate varnish for gravure ink.

Hereinafter, the production of the high brightness gravure ink according to the present invention will be explained in more detail.

(Creation of metal vapor-deposited strips) (a) For example, OP as a base film (deposited object)
A plastic film such as P, CPP, or PET is used, and a release agent is applied thereon.

(b) Perform metal vapor deposition on the release agent. The thickness of the deposited layer is preferably 800 to 1000 angstroms. This film thickness is involved in the properties of the ink when it is made into ink. The metal used for metal vapor deposition is aluminum (At
), gold (Au), silver (Ag), Um (Cu), brass (Cu-Zn), tita7 (Ti), chromium (C
r), nickel (Ni), nickel chloride (Ni-
Use appropriate materials such as Cr), stainless steel (Strs), etc.
(／→ In order to prevent the oxidation of the vapor deposited metal, a dog coat agent is applied to the vapor deposited surface. Although this step is not necessarily necessary, the vapor deposited metal is immediately coated with the vapor deposited metal in order to produce the high brightness Gravline based on the present invention. There are cases where the metal is used and stored without immediate use, and it is preferable to apply a top coat to prevent the deposited metal from oxidizing and reducing its brightness during storage. The main component of the agent is preferably the same as the main component of the stripping agent.

(b) Peeling the deposited metal layer from the base film.

At this time, the release agent layer and top coat agent layer are peeled off from the base film together with the vapor-deposited metal layer. This peeled three-layer body consisting of the top coat agent layer/vapor deposited metal layer/release agent layer is ground to a roughness of about 100 meshes (approximately 150 μm) to obtain vapor deposited metal pieces.

The above-mentioned release agent and dog coat agent are dissolved by an organic solvent and become part of the ink binder during the ink formation process described later.

Therefore, the release agent and dog coat agent should be selected according to the type of ink to be produced, that is, the type of resin varnish.

Therefore, the resins that can be used as stripping agents and dog coat agents include acrylic resins, vinyl resins (monopolymers, vinyl acetate copolymer resins), nitrified cotton, and other types of resin varnishes that are currently in common use. cellulose), cellulose resin (C
AP, CAB), polyamide resin, polyester resin, EVA resin, chlorinated PP or chlorinated EVA R
Examples include oils, petroleum-based resins, and the like. Of course, the resin is not limited to these resins, and if another resin is used as the resin varnish for the ink, that resin can be used.

(Ink formation) a) Dissolution of the release agent and dog coat agent attached to the vapor-deposited metal strips The vapor-deposited metal strips are stirred and melted in an organic bath agent.

As a result, the release agent and top coat agent become part of the resin varnish as a binder for gravure ink. Also, the vapor-deposited metal strips can be made pure.

Examples of organic solvents that can be used in the above step include toluene, xylenes, N-hexane, cyclohexane, methyl acetate, ethyl acetate, isopropyl acetate, n-propyl acetate, n-butyl acetate, isobutyl acetate, methanol, ethanol, n-cropyl alcohol, isobutyl alcohol,
n-butyl alcohol, isobutyl alcohol, sec-butyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, propylene glycol monomethyl ether, propylene glycol monomethyl acetate, clopylene glycol monoethyl ether, propylene gellicol monoethyl ether acetate, Examples include ethylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether, and ethylene glycol monoethyl ether acetate.

(1) Surface treatment of vapor-deposited metal flakes Once the vapor-deposited metal flakes have become pure vapor-deposited metal flakes through step (a), organic fatty acids such as stearic acid, oleic acid, palmitic acid or methylsilyl isocyanate) ( CH, 5l(NCO), ) is deposited on metal strips (
(including release agent and top coat) in a weight ratio of 3 to 7 kg, and stir well.

As a result, in the case of organic fatty acids, the organic fatty acids coat the metal surface, and a part of the organic fatty acids reacts with the vapor-deposited metal strips, and the surface of the metal strips becomes a metal soap. It prevents oxidation, improves dispersibility using a grinding machine such as a side mill or Guino mill, and provides brightness. Also, methylsilyl isocyanate (CH, 81 (NGO)
In the case of 3), in addition to the same effect as organic fatty acids, delamination of vapor-deposited metal pieces can be improved. If the above-mentioned surface treatment is not carried out, the dispersibility by kneading will be poor and the improvement in brightness will be less.

c) The resin varnish used as a binder for the desired gravure ink and the vapor-deposited metal strips subjected to the surface treatment described above are blended with the resin varnish, stirred, and milled in a bead mill such as a side mill or a dyno mill to form an ink.

The kneading is carried out by setting and controlling the kneading conditions such as the amount of ink discharged and the amount of beads filled so that the vapor-deposited metal strips become particles of about 20 to 30 μm.

If the metal particles are too coarse, the density and hiding power will be poor, and if the particles are too fine, the brightness will be low.

The main resins, additives, and solvents used in resin varnishes for gravure inks are as follows: ◎Resin: Acrylic resin, vinyl chloride-vinyl acetate copolymer resin, nitrified cotton, cellulose resin, polyamide Resin, urethane resin, polyester resin, EVA resin, chlorinated pp resin, chlorinated EVA resin, cyclized rubber resin, rosin-modified maleic acid resin, petroleum resin, chlorinated rubber resin, vinyl chloride & vinyl isobutyl ether copolymer resin, Butyral resin, vinyl chloride surface acrylic copolymer resin, styrene resin, styrene maleic acid resin, shellac, alkyd resin, polyurethane resin, urea resin, melamine resin, incyanate, etc. Solvents: toluene, xylene, Cyclohexane, methyl acetate, ethyl acetate, isopropyl acetate, acetic acid n
Glovil, n-butyl acetate, isobutyl acetate, methanol, ethanol, rogropyl alcohol, isobutyl alcohol xobutyl alcohol, sec-butyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, 7' Ropylene glycol heptanoethyl ether, propylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether, ethylene glycol monomethyl ether acetate,
Additives...? Polyethylene wax, polypropylene wax, polyester wax, foaming & polyethylene wax, amide wax, plasticizer, titanium chelating agent, surfactant, dispersant, antifoaming agent, leveling agent, silicone, etc. [Example] Implementation Example 1 Asian acrylic gravure ink for shrinkable PVC) Creation of vapor-deposited aluminum strip a, Acrylic release agent (MMA) on CPPφ30
t-solid content 15±2 well adjusted, 1751fM/25~
Printed on 30μ gravure plate.

b. On top of this, vacuum evaporate aluminum 1 to a thickness of 800 to 1000 angstroms.

C. Dog coat agent (same product as release agent) Printed under the same conditions as T-release agent printing.

d6 Peel the vapor deposited layer (release agent, vapor deposited aluminum, top coat agent) from CPP+30 and remove 100 meshes (approximately 15
Make strips with a roughness of 0μ).

1) Blend ink a, 20 parts of vapor-deposited aluminum strips, 39 parts of toluene, and 1 part of oleic acid, and stir for 30 minutes.

b. After adding 34 parts of shrinkable PvC acrylic varnish and stirring, use a Guino mill to measure vapor-deposited aluminum strips with particles of 20 to 30 μm.
Grind the meat until it looks like this.

Finish by adding 6 parts of C0 additive and auxiliary agent.

Example 2 In the case of urethane-based gravure ink for lamination a) Creation of vapor-deposited aluminum strips a. Apply urethane-based release agent to PET film 12 at a solid content of 15
Adjusted to ±2% and printed with 175@725~30μ gravure plate.

b. On top of this, vacuum evaporate aluminum to a thickness of 800 to 1000 angstroms.

c.) Print a rag coat agent (same product as the release agent) under the same conditions as the release agent.

d. Peel off the vapor deposited layer (release agent, vapor deposited aluminum, dog coat agent) from PET+12 and make 100 meshes (approximately 150 meshes).
Make strips with a roughness of μ).

Mouth) Ink a, 20 parts of vapor-deposited aluminum strips, MEK/toluene/IPA
= 42 parts of a 5/3/2 solvent and 1 part of stearic acid were blended and stirred for 30 minutes.

b. Rethane-based gravure ink varnish 34 for laminating
After stirring, the vapor-deposited aluminum pieces are milled using a Guino mill so that the particles are 20 to 30 μm in size.

Finish by adding 3 parts of C1 additive and auxiliary agent.

Example 3 In the case of polyamide-based gravure ink for surface printing a) Preparation of vapor-deposited aluminum strips ha OPP÷30 and nitrified cotton thread release agent (H1/16m
) 1fr: Adjusted to solid content 10±2%, 175 lines/2
Printed on a 5-30μ gravure plate.

b. Vacuum evaporation of aluminum to a film thickness of 800 to 1000 angstroms on top of this.

c. Print the top coat agent (same product as the release agent) under the same conditions as the release agent.

d. Vapor deposited layer (release agent, vapor deposited aluminum, top coat agent)
Peel it off from OPP 30 and make 100 meshes (approximately 150
Make strips with a roughness of μ).

Mouth) Ink formation a, 20 parts of vapor-deposited aluminum strips, ethyl acetate/toluene/I
34 parts of PA-4/4/2 solvent and 1 part of palmitic acid are blended and stirred for 30 minutes.

b. After adding 40 parts of polyamide 9-based gravure ink FES and stirring, finely coat the vapor-deposited aluminum strips with a Guino mill to a particle size of 20~
Grind the meat to a thickness of 30μ.

Finish by adding 5 parts of C0 additive and auxiliary agent.

Table 1 shows the results of printing with the gravure inks obtained in Examples 1 to 3 above and measuring the brightness of the printed surface with a glossy needle, and the brightness when printing with the conventional gravure ink using aluminum paste. I wrote it down. Similar measurements were also made on samples using conventional aluminum yeast. For the measurement, a digital variable angle gloss meter UGV-5K manufactured by Suga Test Instruments 1 was used.

Table 1 [Effects of the invention] Metallic prints such as silver and gold using the high brightness gravure ink of the present invention have much better brightness than those using conventional aluminum paste.
It has coloring properties close to the brightness of aluminum vapor-deposited film and aluminum foil.

This means that we can expect the development of printed matter using aluminum vapor deposition or aluminum foil.

For example, it is possible to produce similar printed matter only by printing without going through the cutting process of conventional technology, which reduces costs by reducing the number of processes, improves work efficiency, and allows for free and innovative printing designs, etc. You can expect the benefits of

Furthermore, the silver ink of the present invention is printed after the white ink,
It is possible to improve the hiding power without impairing the whiteness of white ink, and new developments can be expected in fields where hiding power is required.

Agent: Patent attorney Katsutoshi Takahashi

Claims (1)

[Claims] A high-brightness gravure ink characterized by dispersing metal flakes obtained by crushing a vapor-deposited metal film into a resin varnish.