JPS5859056A - Manufacture of laminate product - Google Patents

Abstract

PURPOSE:To save dry energy and to obtain a non-odorous laminate product, by a method wherein an aluminum foil is laminated to a printed matter, in which a given amount of moisture residue is left by the use of aqueous ink containing ammonia, with solvent-free type adhesive agent. CONSTITUTION:A printing is performed by the use of aqueous ink containing ammonia and a basic component of organic amine, such as diethanoleamine, triethanoleamine, and a plastic film, an aluminum foil, a paper are laminated to a printed matter, in which 50-1,000mg/m<2> moisture and/or 3-50mg/m<2> a basic component is left as a residue, with a solvent-free type adhesive agent containing an isocyanate group to obtain a desired laminate product. EFFECT:There is no sanitary trouble due to a residual solvent, and there is no danger of solvent odious smell and of fire in a working place.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses water-based printing inks and solvent-free adhesives to eliminate the odor and toxicity of residual organic solvents, and to reduce the engineering effort required to dry water-based inks. The present invention relates to a method for producing a laminate that is durable.

Conventional methods for producing laminated products for food packaging include melt extrusion of resins such as polyethylene/polypropylene using imine compounds, organic titanates, incyanates, etc. as anchor coating agents (extrusion lamination); A method of laminating polyethylene, polypropylene, aluminum foil, etc. using adhesives dissolved in esters, ketones, or aromatic solvents has been used, and in recent years Nowadays, lamination methods using solvent-free adhesives (non-solpe/tramination), which have fewer problems in terms of hygiene and odor remaining in laminated products using organic solvents, are also used, but solvent-based adhesives are used as printing inks. The reality is that the above-mentioned drawbacks cannot be completely eliminated and the advantages of solvent-free adhesives cannot be fully utilized. Additionally, solvent-free adhesives have a slower curing speed than conventional solvent-based adhesives (and to compensate for this, there was the hassle of spraying water vapor onto the substrate during lamination). Ice-water-based printing inks have traditionally been used on water-absorbent printing substrates such as paper and cardboard, but in recent years they have also been used to print on plastic films such as polypropylene and polyester.However, water-based inks have been used on these plastic films. In terms of application, water as a solvent has no way of penetrating the printer, so it has poor drying properties, making it more difficult to print on a commercial basis than before.

It is unfortunate that we are forced to consume a large amount of drying energy.

The present inventor focused on the fact that by laminating using both a solvent-free adhesive and a water-based ink, which are the best in terms of surgical technique, the drawbacks of both can be compensated for, and the present invention was developed. This is what I did. That is, the present invention is a method of laminating a printed matter printed on a printing base material with a plastisol film, aluminum foil, etc. using an adhesive, using an aqueous ink containing a basic component such as ammonia or organic amines as the printing ink. 50 to 1000 μ/- moisture or 3 to 50 m
g/n? The present invention relates to a method for producing a laminate, characterized in that either 10,000 or both of the basic components are left behind, and a solvent-free adhesive containing an isocyanate group is used as the adhesive.

The printing base materials in the present invention include paper and aluminum foil.

Materials conventionally used as leaf materials for food packaging, such as plastic film, can be used.

Also, in terms of the constituent materials of laminates, different types of plastic films, N1/plastic film, aluminum foil/silastic film.

Alternatively, it can be applied to laminates including all structures conventionally used depending on the purpose of use, such as paper/aluminum foil.

The above plastic films include polypropylene, polyester, Nycon, cellophane, etc., as well as polyvinylidene chloride coated film and ethylene-hinyl acetate copolymer coated film. Of these, an easily adhesive polyester film or an easily adhesive polyester film is preferred.

The water-based printing ink used in the present invention includes:

The main vehicle is a water-based acrylic resin containing a basic component of amines such as ammonia or jetanolamine or triethanolamine, or a water-soluble or water-dispersible resin such as a water-based polyurethane resin. Pigment 9
The composition includes various additives, water, and lower alcohols such as methanol, ethanol, and isoprono(nol).

As a method for printing the above water-based ink on the printing base 1', a gravure method or a flexo method is preferable.

In the present invention, when printing with water-based ink, the surface of the printing medium has a moisture content of 50 to 1000 mV/- or 3 to 50 mV/-.
The drying of the printed ink must be controlled to ensure that one or both of the basic components remain. If the residual moisture and basic components are less than the above values, the curing reaction during lamination will not proceed sufficiently. Also, the amount of residual moisture is 1o o o my/rr? If the above happens, the printing ink will stick to the film and lamination processing will be possible, but this is not preferable because the printed area will tend to bleed or have a swimming pattern on the laminated product. Furthermore, if the basic component to be left remains in an amount of 5 omg/- or more, the water resistance of the laminate may be low and odor may be generated, which is not preferable.

The solvent-free adhesive containing an incyanate group in the present invention is one whose curing reaction is promoted by water, ammonia, or amines, and for example, AD7, which is commercially available as a polyether type polyurethane resin from Toyo Morton ■.
6FS289-2. AD76PS289-1 can be mentioned0 The above-mentioned solvent-free adhesive can be applied to the base material by a conventional method such as a gravure method.OAlternatively, 6- In the present invention, the printing process and the laminating process are performed in a so-called in-line process. However, even if in-line lamination is not possible due to the process, if the printed base material is dried to the extent that it does not block (moisture content of 300 mg/rr? or less), it can be used in the next lamination process without any problems. can.

As described above, the present invention can significantly save the drying energy during printing, the water vapor generation energy used during laminate processing, and the thermal energy of the insulating room for accelerating the curing of adhesives, thus meeting the social demands for resource and energy conservation. It is also an excellent method for manufacturing laminates in terms of the working environment, as there is no odor or hygiene problems caused by residual solvents, and there is no danger of solvent odor or fire in the workplace.

The present invention will be explained in detail in Examples below. In addition
All parts in the examples indicate parts by weight.

Example t Anionic acrylic resin 20 parts (Primal ■-94 ammonia neutralized aqueous solution, solid content 4
0%, manufactured by Rohm and Haas) Phthalocyanine blue 10 parts ethanol 5 parts water
After kneading 10 parts of the above acid-resistant material in a ball mill for 10 hours and uniformly dispersing it, add 30 parts of the above anionic acrylic resin, 5 parts of ethanol, and 1 part of water.
After adjusting the viscosity to 30 seconds by blending the adjusting liquid consisting of 0 parts (the full use of Zahnkang φ3, the same applies to the following examples), the viscosity was further adjusted to 20 seconds by adding a mixed solvent of water/ethanol-1/1 (weight ratio). A gravure printing ink was obtained.

Next, the entire surface was printed on an easily adhesive polypropylene film (trade name, MS-42 manufactured by Toshi Co., Ltd.) using a 25 μg 2-pier plate, and the drying temperature and printing speed were changed to produce different amounts of residual moisture and residual ammonia■,■ , ■, ■, ■, and for comparison, prints were made using solvent-based ink on nitrified cotton yarn.

Next, using the above printed matter, apply polyurethane solvent-free adhesive (AI) 76F8289-2. Toyo Morton Co. I! The film was coated with a coating amount of 1.5 W/-, and laminated with and without steam spray using low density polyethylene (NB-1, trade name manufactured by Tamabori Co., Ltd.) as a sealant.

The laminate obtained by the above method was heated at room temperature (average 15°C).
) The degree of hardening of the adhesive was investigated when stored in the container (Cat 1).

Table 1 9- As is clear from Table 1, printed matter that retains a large amount of moisture and ammonia cures extremely quickly, and can be put to practical use without the conventional method of steam spraying during lamination. I found out what happened.

Example 2 Using the water-based gravure printing ink used in Example 1, an easily adhesive polyester (Q-27゜trade name manufactured by Toshi Co., Ltd.) was coated with 80 m/bait at a constant feeding speed and drying temperature was changed to 25 μm. It was printed with a gravure plate and laminated in-line using the i-solvent adhesive used in Example 1 without spraying water vapor.

The degree of curing of the adhesive and the laminate strength of the thus obtained laminate were measured after one day and are shown in Table 2.

In addition, the presence or absence of blocking of the scroll printed under the same conditions as above, and the amount of residual ammonia and residual moisture in the printed matter were measured and shown in Cloth 2.

10- Table 2 1) Degree of curing: Checked 1 day after Lamicy 1.

2) Lamination strength: f/15m Peeling speed: 30c7n/Purchased T-type Peeling As is clear from Table 2, even when printed under dry conditions that would normally not be able to be rolled up off-line.

When laminated in-line, a product with no problems in appearance can be obtained, and the curing time after lamination is also short.

Example 3 Styrene-acrylic acid equimolar copolymer (A) 20
Part titanium white 30 parts Water

10 parts ethanol 5
After kneading the above acid-resistant material in a ball mill for 10 hours and dispersing it uniformly, blending the above acid resistant solution with 25 parts of the above resin (A), 5 parts of ethanol, and 5 parts of water to adjust the viscosity to 30 seconds, and then adding water. The mixture was diluted with a mixed solvent of /ethanol = 1/1 (in ratio) to a viscosity of 20 seconds to obtain a gravure printing plate.

Next, using the easily adhesive polypropylene film, solvent-free adhesive, and sealant in Example 1,
Laminated in-line without steam atomization.

Table 3 shows the degree of curing of the adhesive in the laminate thus obtained and the laminate strength measured in the same manner as in Example 2.

Next, as a water-based resin, ethyl acrylate/acrylic acid 2-
Ammonia neutralized product (B) of ethylhexyl/methyl methacrylate copolymer, jetanolamine neutralized product 0. Triethanolamine neutralized products of styrene/acrylic acid equimolar copolymer 0 and O; for comparison, unneutralized product of styrene/acrylic acid equimolar copolymer (g), and shellac-modified styrene emulsion resin. Table 3 shows the test results of laminates obtained by using the same amount of the unneutralized product σ as the resin (A).

Table 3 patent applicant Toyo Ink Manufacturing Co., Ltd. 13-

Claims (1)

[Claims] 1. In a method of laminating a plastic film, a sheet of aluminum foil, etc. with an adhesive to a printed matter printed on a printing base material, printing is performed using a water-based ink containing a basic component such as ammonia or organic amines as the printing ink, and Allowing either 10,000 to 10,000 of moisture or 3 to soTng/- of a basic component, or both, to remain on the printed matter, and using a solvent-free adhesive containing incyanate as the adhesive. A method for producing a laminate product characterized by: