JPH04213375A - Gravure ink for heat lamination - Google Patents

Abstract

PURPOSE:To dispense with adhesives in the lamination of printed films by incorporating three specific polymers in a gravure ink for heat lamination as a binder. CONSTITUTION:An ethylene/vinyl acetate copolymer, a chlorinated polypropylene and a vinyl chloride/isobutyl vinyl ether copolymer are used as a binder. Then, a gravure ink for heat lamination is prepared by mixing the binder, an organic solvent (e.g. toluene), a pigment (e.g. monoazo pigment), a lubricant (e.g. polyethylene wax), an antistatic agent, etc. Using the ink, a biaxially oriented polypropylene film is printed and thermally pressed, thereby permitting its lamination. Accordingly, since no adhesive is needed, no residual solvent remains due to the coating of the adhesive and no aging time for the adhesive is necessary.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gravure ink for thermal lamination.

0002

2. Description of the Related Art Conventionally, there are the following industrial methods for laminating printed films. (a) A method in which adhesive is applied to the surface printed with dry lamination ink, and after drying, another sealant film is bonded under heat between rolls.

(b) An anchor agent is applied to the surface printed with extrusion lamination ink, and a hot melt adhesive material, typically LDPE, is melted into a thin film from an extruder on top of the anchor agent. A method of extruding through the slit and pasting it together. However, these methods require the use of adhesives or anchoring agents, thus increasing manufacturing costs and
There were problems with the amount of residual solvent and aging time.

0004

[Problems to be Solved by the Invention] The present inventors have discovered that by using a specific printing ink, adhesives such as those for dry lamination are unnecessary, residual solvents caused by adhesive application are eliminated, and adhesive As a result of research aimed at eliminating the need for aging time for agents, the present invention was achieved.

[0005]

[Means for Solving the Problems] The present invention relates to a gravure ink for thermal lamination, characterized in that it contains an ethylene vinyl acetate copolymer, a chlorinated polypropylene, and a vinyl chloride isobutyl vinyl ether copolymer as a binder. . The gravure ink for thermal lamination according to the present invention contains an ethylene vinyl acetate copolymer, a chlorinated polypropylene, and a vinyl chloride isobutyl vinyl ether copolymer as a binder, and further contains a cyclized rubber as required.

The ethylene vinyl acetate copolymer has a vinyl acetate content of 35% to 45% by weight and a molecular weight of 8000.
~15,000 is preferred. Chlorinated polypropylene has a molecular weight of 10,000 to 30,000 and a degree of chlorination of 15.
% to 40% is preferred. As the vinyl chloride isobutyl vinyl ether copolymer, for example, Laroflex MP25, Laroflex MP35, Laroflex MP45, and Laroflex MP60 manufactured by BASF can be used, but Laroflex MP45 is most preferable. The ratio of the ethylene vinyl acetate copolymer to the chlorinated polypropylene used is preferably 20:80 to 60:40 by weight. The proportion of the vinyl chloride isobutyl vinyl ether copolymer used is preferably 20 to 40 in terms of weight ratio, where the total of the ethylene vinyl acetate copolymer and the chlorinated polypropylene is 100.

[0007] The gravure ink for thermal lamination according to the present invention, like ordinary gravure inks, uses an organic solvent,
Contains pigments and additives if necessary. Types of organic solvents include toluene, xylene, n-hexane, cyclohexane, methyl acetate, ethyl acetate, isopropyl acetate, n-propyl acetate, n-butyl acetate, sec-butyl acetate, methanol, ethanol, n-propyl Alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, sec-butyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone,
Propylene glycol monoethyl ether, propylene glycol monoethyl ether, propylene glycol monoethyl ether acetate, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether, ethylene glycol monoethyl ether acetate, petroleum hydrocarbon solvents are used It is possible.

As the pigment, ordinary pigments for gravure ink can be used, such as organic pigments such as monoazo, disazo, phthalocyanine, and dioxazine, inorganic pigments such as titanium dioxide and ferric oxide, and carbon. Black is available. As additives, lubricants such as polyethylene wax and amide wax and antistatic agents can be used.

[0009] A treated biaxially oriented polypropylene film (hereinafter abbreviated as treated OPP film) is printed using the gravure ink for thermal lamination according to the present invention, and then the treated sealant film is printed using a GTL laminating machine manufactured by Gunze Co., Ltd., etc. It can be laminated by thermocompression bonding. A thermally laminable treated OPP film that can be used for this purpose is the SILFAN LAG type developed by Gunze Co., Ltd. As the sealant film, a general treated unstretched polypropylene film (hereinafter abbreviated as treated CPP film) can be used.

[0010] As a laminating machine that can be used for thermal lamination, a GTL laminating machine manufactured by Gunze Co., Ltd. can be mentioned. Treated OPP film and treated CPP printed with gravure ink for thermal lamination according to the present invention can be mentioned. The conditions for thermal lamination with the film are a temperature of 90°C to 150°C and a pressure of 20kg/cm.
2~60kg/cm2, lamination speed 50m/min~1
The speed is 80m/min. Particularly preferable conditions include temperature 1
15℃~125℃, pressure 35kg/cm2~45kg/
cm2, and the laminating speed is 120 m/min to 130 m/min.

[0011] The laminate produced by this method has a weight of 50g/
15mm~200g/15mm (T-peel, speed 20
0 mm/min). Furthermore, unlike conventional dry lamination, the amount of residual solvent does not tend to increase due to lamination processing, but rather tends to decrease, ranging from 1.5 mg/m2 to 3.0 mg/m2.
2 or less.

0012

[Examples] The present invention will be explained below with reference to Examples. Example 1 A gravure ink for thermal lamination having the following formulation was prepared using a sand mill. Titanium oxide 30.0 Weight percent
Saint Binder 9.0
Weight percent organic solvent 60
．． 0 weight percent polyethylene wax 0.
8 Weight percent antistatic agent
0.2 weight percent Here, the binder composition is as follows. Ethylene vinyl acetate copolymer
35.5 Weight percent chlorinated polypropylene
39.5 weight percent Vinyl chloride isobutyl vinyl ether copolymer 25.0 weight percent The organic solvent composition is as follows. Toluene 50.0
Weight percent ethyl acetate
15.0 Weight percent methyl ethyl ketone
30.0% by weight Isopropyl alcohol 5.0% by weight Using the obtained gravure ink for thermal lamination, Gunze Silphan LAG #40 (treated OPP film manufactured by Gunze Co., Ltd.)
and then using a Gunze GTL laminating machine at a laminating speed of 120 m/min and a laminating temperature of 13
Torcello CHC#20 as a sealant film at 2℃
By thermo-compression bonding (treated CPP film made by Tocello Co., Ltd.), Tocello CHC is attached to Gunze Silfan LAG #40.
#20 was laminated.

The lamination strength and residual solvent amount of the obtained laminated film were measured and found to be as follows. Example 2 A gravure ink for thermal lamination having the following formulation was prepared using a sand mill. titanium dioxide
30.0 Weight percent binder 9.0 Weight percent Organic solvent 60.0
Weight percent polyethylene wax 0.8
Weight percent antistatic agent 0
．． 2 weight percent, where the binder composition is as follows: Ethylene vinyl acetate copolymer
20.0 weight percent chlorinated polypropylene
55.0 Weight percent Vinyl chloride isobutyl vinyl ether copolymer 25.0 Weight percent The organic solvent composition is as follows. toluene
50.0% by weight Ethyl acetate 15.0% by weight Methyl ethyl ketone 30.0% by weight Isopropyl alcohol 5.0% by weight Gunze Silphan using the obtained gravure ink for thermal lamination Print on LAG #40 (treated OPP film manufactured by Gunze), then print on LAG #40 (treated OPP film manufactured by Gunze)
Using TL laminating machine, laminating speed 120m/
Gunze Silphan LAG
Torcello CHC #20 was laminated onto #40.

The lamination strength and residual solvent amount of the obtained laminated film were measured and found to be as follows. Example 3 A gravure ink for thermal lamination having the following formulation was prepared using a sand mill. titanium dioxide
30.0 Weight percent binder 9.0 Weight percent Organic solvent 60.0
Weight percent polyethylene wax 0.8
Weight percent antistatic agent 0
．． 2 weight percent, where the binder composition is as follows: Ethylene vinyl acetate copolymer
15.0 Weight percent chlorinated polypropylene
65.0 Weight percent Vinyl chloride isobutyl vinyl ether copolymer 20.0 Weight percent The organic solvent composition is as follows. toluene
50.0 weight percent ethyl acetate 15.0
Weight percent methyl ethyl ketone 30.
0 weight percent isopropyl alcohol
5.0 weight percent Gunze Silfan LAG #4 using the obtained thermal lamination gravure ink
0 (treated OPP film manufactured by Gunze Corporation), and then printed on Tocello CHC #20 (treated CPP film manufactured by Tocello Corporation) as a sealant film using a GTL laminating machine manufactured by Gunze Corporation at a laminating speed of 120 m/min and a lamination temperature of 132°C. Tocello CHC #20 was laminated onto Gunze Silfan LAG #40) by thermocompression bonding.

The lamination strength and residual solvent amount of the obtained laminated film were measured and found to be as follows. Example 4 The gravure ink for thermal lamination obtained in Example 1 was used to print on Gunze Silphan LAG #40 (treated OPP film manufactured by Gunze Co., Ltd.), and then printed on Gunze Silfane LAG #40 (treated OPP film manufactured by Gunze Co., Ltd.).
Pyrene #20 was bonded to Gunze Silfan LAG #40 by thermocompression bonding Pyrene #20 (treated CPP film manufactured by Toyobo Co., Ltd.) as a sealant film at a laminating speed of 120 m/min and a laminating temperature of 132°C using an L laminating machine. Laminated.

The lamination strength and residual solvent amount of the obtained laminated film were measured and found to be as follows. Example 5 The gravure ink for thermal lamination obtained in Example 1 was used to print on Gunze Silphan LAG #40 (treated OPP film manufactured by Gunze Co., Ltd.), and then printed on Gunze Co., Ltd. GT
Gunze Silfan LAG #40 was laminated with various sealant films by thermocompression bonding the various sealant films shown in the following table using an L laminating machine at a lamination speed of 120 m/min and a lamination temperature of 132°C.

The lamination strength of the obtained laminated film was measured on the next day and 6 days later and was as follows.

[0018]

[Table 1]

[0019]

[Effects of the invention] By using the printing ink of the present invention, when laminating printing films, adhesives such as those for dry lamination are not required, residual solvents caused by adhesive application are eliminated, and adhesive It is also possible to eliminate the need for aging time.

Claims (1)

[Claims] 1. A gravure ink for thermal lamination, characterized in that it contains an ethylene vinyl acetate copolymer, a chlorinated polypropylene, and a vinyl chloride isobutyl vinyl ether copolymer as a binder.