JP2000351184A - Film for printing lamination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject film requiring no solvent, generating no wrinkles at a time of production and no elongation and breaking of a laminated film at a time of printing lamination, capable of being thermally bonded at low temp., not generating the discoloration of printing ink and a curl and improving the cutting properties of the laminated film. SOLUTION: An ethylenic resin layer with a density of 0.900-0.960 g/cm3 and MFR is 1-100 g/10 min is laminated on the single surface of a thermoplastic resin film substrate and a layer of a straight chain ethylene/α-olefin copolymer resin obtained by copolymerizing ethylene and a 3-12C α-olefin and having a density of 0.87-0.910 g/cm3 and MFR of 1-100 g/10 min is laminated thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-bonded print laminating film used for protecting the surface of printing paper or the like.

[0002]

2. Description of the Related Art Lamination of a film on a printing paper is widely practiced for the purpose of protecting the surface of the printing paper, imparting water resistance or oil resistance, or improving the surface gloss.
As a film for print lamination used for such a purpose, a stretched polypropylene film is used as a base film, and a solvent-type ethylene-vinyl acetate copolymer-based adhesive is frequently used as the adhesive. However, the method of using a solvent-type adhesive requires special attention to solvent recovery and work environment from the point of handling the solvent, and generally, it is necessary to consider the pot life from the point of further using a curing agent. .

[0003] As a method for producing a laminate film without using an organic solvent or an adhesive, a biaxial film having a heat-sensitive adhesive layer comprising a mixture of two or more ethylene-alkyl ester copolymers and ethylene-vinyl acetate copolymer is provided. A method of manufacturing a printed laminate product by bonding the heat-sensitive adhesive surface of a stretched polypropylene laminate film and the adhesive surface of a printing paper only by heating and pressing (Japanese Patent Application Laid-Open Nos. 56-42652, 4-2431, and Kaihei 3-7334
No. 1 publication). However, for the requirement of easy adhesion with the printing surface, the ethylene-based copolymer resin of the heat-sensitive adhesive layer uses a functional monomer content as large as possible,
Poor slipperiness, poor anti-blocking properties, poor roll release during film production, wrinkles, or when transported or stored in a rolled state, the overlapping substrate surface and ethylene copolymer resin stick together, When the film is rewound and used for laminate printing, there is a problem in that the bonding tension is increased, and the laminated film is stretched or broken.

Further, a method of manufacturing a print laminate product by laminating a film obtained by laminating a resin containing an ethylene-based resin on a linear ethylene / α-olefin copolymer using a metallocene compound as a catalyst only by heat and pressure bonding ( JP-A-7-117197). However, this laminated film is inferior in the cut property of the laminated film at the time of print lamination. In addition, the linear ethylene / α-olefin copolymer alone has a problem that a surging phenomenon occurs at the time of extrusion lamination processing, and film formation cannot be performed.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to eliminate the occurrence of solvent odor during print lamination, eliminate the need for a solvent removal and recovery device, and consider the pot life. No wrinkles during film production, no elongation or breakage of the laminated film during print lamination, and two types of resin are co-extruded to suppress the surging phenomenon during extrusion lamination, enabling stable film forming. An object of the present invention is to provide a print laminating film which can be thermally bonded at a low temperature during print lamination, has no discoloration of printing ink of a print laminate product, has no curl, and has improved cutability of a laminated film at the time of print lamination.

[0006]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, laminated a specific ethylene-based resin on one surface of a thermoplastic resin film base material, Thermal lamination of the linear ethylene / α-olefin copolymer layer in contact with the printed surface of the printed material enables low temperature print lamination with the printed surface of the printed material, and discoloration of the printing ink of the printed laminate product. It has been found that curling can be prevented, the cutability of the laminated film at the time of print lamination can be improved, the surging phenomenon at the time of extrusion lamination can be prevented, and a stable film can be formed, and the present invention has been completed. That is, the present invention is a print laminating film in which the following resin layer (A) is in contact with one surface of a thermoplastic resin film substrate and the resin layer (B) is laminated thereon. (A) resin: a density of 0.900 to 0.960 g / c
m ³ , an ethylene resin having an MFR of 1 to 100 g / 10 min. (B) resin: a density obtained by copolymerizing ethylene and an α-olefin having 3 to 12 carbon atoms is 0.870 to 0.910.
g / cm ³ , and a linear ethylene / α-olefin copolymer having an MFR of 1 to 100 g / 10 min.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Thermoplastic resin film substrate of the laminated film As the thermoplastic resin film substrate used for the laminated film that is the film for print lamination of the present invention,
An unstretched or stretched film of a thermoplastic resin such as polypropylene, polyethylene, polyethylene terephthalate, polyvinyl chloride, and polystyrene may be used. The thickness of the substrate film is preferably from 6 to 100 μm, more preferably from 7 to 40 μm. A lubricant, an anti-blocking agent, a stabilizer, an antioxidant, an antistatic agent, an anti-fogging agent, a colorant, and other additives may be blended in the thermoplastic resin film base material.

[0008] 2. Adhesive Resin Layer The resin layer laminated on the surface of the thermoplastic resin film substrate is composed of the following ethylene resin (A) layer and a linear ethylene / α-olefin copolymer (B) laminated thereon. Consists of layers.

(A) Ethylene resin Density of the ethylene resin used in the present invention (JIS K71)
12, method A) is 0.900 to 0.960 g / cm ³ ,
Preferably 0.905~0.950g / cm ^3, particularly preferably from 0.915~0.945g / cm ^3.
If the density is less than 0.900 g / cm ³ , the cut property of the film at the time of print lamination deteriorates, and the density becomes 0.960 g / cm ^3.
If it exceeds g / cm ³ , the adhesiveness between the resin layers (A) and (B) described later deteriorates. Further, the appearance (blurring) of the printed laminate product is deteriorated, and the curl property is also poor. The MFR (JIS K7210, condition 4) of the ethylene resin is as follows:
It is 1 to 100 g / 10 min, preferably 2 to 80 g / 10 min. Any having an MFR outside the above range is inferior in moldability because the melt viscosity is too high or too low.

The ethylene resin used in the present invention includes:
The following (a) to (d) can be used. (A) a copolymer obtained by copolymerizing with a branched high-pressure low-density polyethylene and a monomer copolymerizable with ethylene, for example, vinyl acetate, acrylic acid, methyl acrylate, ethyl acrylate, methacryl methacrylate and the like; Coalescing resin; Specifically, ethylene-vinyl acetate copolymer,
Examples thereof include an ethylene-acrylic acid copolymer, an ethylene-methyl acrylate copolymer, and an ethylene-ethyl acrylate copolymer, and these may be used alone or in combination of two or more. (B) A resin obtained by mixing at least 1% by weight of one or more of the resins described in (a) with a low-pressure high-density polyethylene. (C) a linear ethylene / α-olefin copolymer obtained by copolymerizing ethylene and an α-olefin having 4 to 12 carbon atoms, wherein at least one resin of the above (a) is used in an amount of 1% by weight; A mixture of the above. (D) the copolymer of ethylene and an α-olefin having 4 to 12 carbon atoms is a linear ethylene / α-olefin copolymer polymerized using a metallocene compound as a polymerization catalyst, A resin obtained by mixing at least 1% by weight of one or more resins described in the above (a) with a chain ethylene / α-olefin copolymer.

(B) Linear ethylene / α-olefin copolymer The linear ethylene / α used in the resin layer (B) of the present invention.
The olefin copolymer is a copolymer obtained by copolymerizing ethylene and at least one α-olefin having 3 to 12 carbon atoms. Specifically, a binary copolymer obtained by copolymerizing ethylene and one kind of α-olefin having 3 to 12 carbon atoms, and ethylene and two kinds of carbon atoms having 3 kinds of carbon atoms
And terpolymers obtained by copolymerization of α-olefins (1) to (12). As the α-olefin having 3 to 12 carbon atoms, specifically, propylene, 1-butene, 1-hexene, 1-heptene, 1-octene, 1-decene,
-Dodecene, etc., which may be used alone or in combination. Examples of the linear ethylene / α-olefin copolymer include ethylene / propylene copolymer and ethylene / 1
-Butene copolymer, ethylene / 1-hexene copolymer,
Ethylene / 1-octene copolymer, ethylene / propylene / 1-butene copolymer, and ethylene / propylene /
A 1-hexene copolymer is preferred.

The density of the linear ethylene / α-olefin copolymer (JIS K7112, A method) is 0.870.
０．９0.910 g / cm ³ , preferably 0.875-0.
900 g / cm ³ . Density 0.870 g / cm ³
If it is less than 1, the moldability is inferior and the blocking property is also poor,
Elongation or breakage of the laminated film during print lamination may occur. When the density exceeds 0.910 g / cm ³ , the adhesiveness to the printed surface of the printed body and the appearance of the printed laminate product (inconsistency) are inferior. Further, the MFR (JIS K7) of the linear ethylene / α-olefin copolymer is used.
210, Condition 4) is 1 to 100 g / 10 min, preferably 2 to 80 g / 10 min. Any having an MFR outside the above-mentioned range is inferior in film formability because the melt viscosity is too high or too low. In addition, when the content is less than 1 g / 10 minutes, the appearance (fog) of the printed laminate product deteriorates.

The linear ethylene / α-olefin copolymer used in the present invention can be polymerized using a known titanium catalyst or metallocene catalyst. Copolymers produced by gas phase polymerization and solution polymerization are preferred, and copolymers with metallocene catalysts having the following physical properties are particularly preferred.

The amount of the linear ethylene / α-olefin copolymer eluted by temperature rise elution fractionation (TREF) is 8
The elution amount at 0 ° C. is 90% by weight based on the total amount of the copolymer.
It is preferable that it is above.

[0015] The temperature rise elution fractionation (Temperat
ure Rising Elution Fracti
onion: TREF) is described in “Jour
nal of Applied Polymer Sc
issue, Vol 26, 4217-4231. (1
981) ”and“ Polymer Paper Collection 2P1C09 (19
1985) ”as follows. First, a polymer to be measured is completely dissolved in a solvent. Thereafter, cooling is performed to form a thin polymer layer on the surface of the inert carrier. Such a polymer layer is likely to be crystallized inside (the side close to the inert carrier surface)
In addition, what is difficult to crystallize is formed on the outside. Next, when the temperature is increased continuously or stepwise, in the low temperature stage, the polymer elutes from the amorphous portion in the target polymer composition, that is, the polymer having a large degree of short-chain branching, and gradually increases as the temperature increases. In this case, the one with a low degree of branching elutes, and finally the linear part without branching elutes, and the measurement is completed. The concentration of the eluted component at such a temperature is detected, and the composition distribution of the polymer can be seen from a graph drawn by the amount of the eluted and the elution temperature.

Further, as the linear ethylene / α-olefin copolymer, those obtained by graft polymerization of maleic anhydride, styrene or the like can also be used. In addition, the linear ethylene / α-olefin copolymer requires a lubricant, an antiblocking agent, a stabilizer, an antistatic agent, an antifogging agent, a colorant, a low molecular weight polymer, and various other additives. Can be added accordingly.

3. Thickness of Adhesive Resin Layer The thickness of the above-mentioned adhesive resin layer is 6 μm or more, preferably 7 to 80 μm in total for the resin layer (A) and the resin layer (B).
Although there is no limitation on the thickness ratio of the resin layer and the resin layer (B), it is preferable that (A) :( B) be 5: 1 to 1: 1.

4. Print Laminating Film The print laminating film of the present invention is obtained by laminating (A) a resin layer on one surface of a thermoplastic film substrate and (B) a resin layer thereon, and the production method is as follows. There is a way. (A) a resin layer, on which (B) a resin layer is pasted, and a double-paste lamination method is applied;
(B) a sandwich extrusion lamination method in which a resin film is bonded by a molten (A) resin layer, (A) and (B) a method of dry laminating a two-layer resin film,
There are (A) and (B) two-layer resin melt coextrusion laminating methods. Preferably, a two-layer co-extrusion laminating method having good high-speed thin-wall moldability is desirable. In this case, the processing temperature is 150 to 3
00 ° C, preferably 200 to 280 ° C is desirable. or,
It is preferable to apply an ozone treatment between the thermoplastic resin film substrate and the (A) resin layer.

When laminating the resin (A) and (B) in two layers by co-extrusion, the thermoplastic resin film base material is previously subjected to a surface treatment such as corona treatment, or an anchor coating agent is applied. It is desirable to keep.

The thus obtained print laminating film is preferably subjected to an oxidation treatment such as a corona treatment or an ozone treatment on the resin layer surface in order to improve the adhesion to the printed surface of the printed body. In particular, corona treatment is the simplest and most effective.

[0021]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to these Examples. The properties of the laminated film, the method of evaluating the properties of the printed laminate product, and the resins used in the examples are as follows. 1. Evaluation method (1) Workability: Surging phenomenon of the molten resin extruded from the T-die (with a thickness of ± 5 μm or more in the flow direction) at a thickness of the laminated resin layer (total thickness in the case of two layers) of 15 μm and a take-up speed of 200 m / min. The occurrence or non-occurrence of thickness variation was observed and evaluated according to the following evaluation criteria. Good: No surging phenomenon occurred. Poor: Film forming is difficult due to occurrence of surging phenomenon.

(2) Anti-blocking property: The surface of the biaxially stretched film 21 cm wide and 29 cm long is overlapped with the corona-discharge treated surface of the laminated film, and is placed in an oven at a temperature of 60 ° C. for 15 cm wide and 20 cm long. .05kg /
After applying a load of ² cm ² and allowing to stand for 24 hours, the laminated film was cut so that the peeled area was 10 cm ² (width 2 cm, length 5 cm), and peeled off with a tensile tester (tensile speed 500 mm / min) ) Was measured. The smaller this value is, the more excellent the antiblocking property is, and it was judged as x to ◎ in the following range. ×: Peeling load (kg / 10 cm 2) of 2 kg or more (laminated film cut). Δ: Peeling load (kg / 10 cm 2) is less than 1.5 to less than 2 kg (the laminated film stretches). ：: peeling load (kg / 10 cm 2) of 1.0 to 1.5 k
g (elongation of the laminated film is restored). A: Peeling load (kg / 10 cm2) is less than 1.0 kg.

(3) Glossiness and fogging: The glossiness (20 degrees) of the printed portion of the printed laminate product was measured by using UGV-5DP (trade name) manufactured by Suga Test Instruments Co., Ltd.
In addition, the rubbing property (the adhesion between the printing paper and the laminated resin) was evaluated by visually observing the rubbing state of the external appearance and according to the following evaluation criteria. ：: There is no residual air, and the printing color is clear. Δ: Air remains as streaks or spots on the print color. ×: Air remains in a band on the print color, and the print color is unclear.

(4) Adhesive strength: The printed laminate product was cut into a test piece having a width of 25 mm and a length of 100 mm, and was peeled by hand in a length direction of 50 mm. The value of the tensile strength peeled at a tensile speed of 1 minute was shown.

(5) Tunneling property: 100 μl of light oil is dropped with a micro syringe on the non-bonded surface of the printing paper of the print laminate product, left in an atmosphere of 23 ° C. and 50% humidity, and laminated for 24 hours. Changes in the film surface were observed and evaluated according to the following evaluation criteria. ：: Adhesion strength and appearance were completely satisfactory. ：: Adhesion strength was slightly lowered, but there was no change in appearance (to the extent that it could be used). Δ: Slight bumps occurred. ×: Tunneling clearly occurred.

(6) Elmendorf tear strength: The film for print lamination was measured by a tear test method (JIS K7128 B method, Elmendorf tear method) for plastic films and sheets.

(7) TREF: TREF temperature rising elution fractionation (Temperature Rising Elut)
In the measurement by ion fractionation (TREF), the polymer was once completely dissolved at a high temperature, then cooled, a thin polymer layer was formed on the surface of the inert carrier, and then the temperature was continuously or stepwise increased to elute. The components are collected, the concentration is continuously detected, and the composition distribution of the polymer is measured by the peak of a graph (elution curve) drawn by the elution amount and the elution temperature.

The elution curve was measured as follows. As a measuring device, a cloth separation device (CFC T101 manufactured by Diamond Instrument) was used. This cross-separation apparatus includes a temperature-rise elution separation (TREF) mechanism for separating a sample by using a difference in dissolution temperature, and a size exclusion chromatograph (Size Exclusion Chromatog) for further separating the separated fractions by molecular size.
SEC) is connected online.

First, the sample to be measured (ethylene-α-
An olefin random copolymer) is dissolved at 140 ° C. using a solvent (o-dichlorobenzene) so as to have a concentration of 3 mg / ml, and the solution is injected into a sample loop in a measuring device. The following measurements are performed automatically according to the set conditions.
The sample solution held in the sample loop is separated using a difference in dissolution temperature by a TREF column (4 mm in diameter, 150 m in length filled with glass beads as an inert carrier).
0.4 ml is injected into a stainless steel column attached to the m apparatus. The sample is then cooled at a rate of 1 ° C./min from 140 ° C. to a temperature of 0 ° C. and coated on the inert carrier. At this time, a polymer layer is formed on the surface of the inert carrier in the order of high crystalline components (easily crystallized) to low crystalline components (difficult to crystallize). After the TREF column is kept at 0 ° C. for another 30 minutes, 2 ml of the component dissolved at a temperature of 0 ° C. is injected from the TREF column into the SEC column (three AD806MS manufactured by Showa Denko) at a flow rate of 1 ml / min. . While the molecular size is being fractionated by SEC, the temperature of the TREF column is raised to the next elution temperature (5 ° C.) and maintained at that temperature for about 30 minutes. The measurement of each elution section by SEC was performed at intervals of 39 minutes. The elution temperature is raised stepwise at the following temperature. 0, 5, 10, 15, 20, 25, 30, 35, 40,
45, 49, 52, 55, 58, 61, 64, 67, 7
0, 73, 76, 79, 82, 85, 88, 91, 9
4,97,100,102,120,140 ° C

The solution fractionated by the molecular size in the SEC column was measured for absorbance in proportion to the concentration of the polymer using an infrared spectrophotometer attached to the apparatus (wavelength 3.42 μm,
Chromatogram of each elution temperature category is obtained. Using built-in data processing software,
The baseline of the chromatogram of each elution temperature section obtained by the above measurement is drawn and processed. The area of each chromatogram is integrated and an integrated elution curve is calculated. Further, this integrated elution curve is differentiated with respect to temperature to calculate a differential elution curve.

2. Sample (A) Ethylene resin in resin layer (1) Low density polyethylene (LDPE): "Novatech LD LC701" (trade name; M, manufactured by Nippon Polychem Co., Ltd.)
(FR: 14 g / 10 min, density: 0.918 g / cm ³ ) (2) Ethylene / vinyl acetate copolymer (EVA): “Novatech EVA LV260” manufactured by Nippon Polychem Co., Ltd.
(Product name; MFR 8.5 g / 10 min, vinyl acetate content 6.0% by weight) (3) Linear low-density polyethylene (LLDPE): "Novatech LL UC470" manufactured by Nippon Polychem Co., Ltd. (Product name; MFR 12 g / 10 minutes, density 0.924g / cm
³ ) (4) High density polyethylene (HDPE): "Novatech HD LY20" (trade name; MF, manufactured by Nippon Polychem Co., Ltd.)
R8 g / 10 min, density 0.941 g / cm ³ )

(B) Linear ethylene / α-olefin copolymer of resin layer (1) Ethylene / 1-hexene copolymer (LLDPE-
Synthesis of 1) Ethylene bis (4,5,6,7-tetrahydroindenyl) zirconium dichloride 2.0 mmol
To 1, methylalumoxane (manufactured by Toyo Stouffer) was added in an amount of 1000 mol times based on the above complex, and the mixture was diluted to 10 liters with toluene to prepare a catalyst solution. This catalyst solution is
The mixture was placed in a 1.5-liter stirred autoclave continuous reactor, and a mixture of ethylene and 1-hexene was fed into the reactor so that the composition of 1-hexene was 81% by weight. The pressure in the reactor is 2200 kg / c
m ² to maintain, the reaction was carried out in 175 ° C., MFR is 31 g /
Linear ethylene / 1-hexene copolymer (LLDPE-10%) having a density of 0.892 g / cm ³ , a melting peak temperature of 80 ° C., and an elution amount of 100% at 80 ° C. or less by temperature rising elution fractionation (TREF) of 10 minutes or less. 1) was obtained.

(2) Synthesis of ethylene / 1-hexene copolymer (LLDPE-2)
Liter of a stirred autoclave type continuous reactor, and a mixture of ethylene and 1-hexene was supplied into the reactor so that the composition of 1-hexene became 86% by weight. The reaction was carried out at 150 ° C. while keeping the MFR at 2200 kg / cm 2, the MFR was 9 g / 10 min, the density was 0.881 g / cm ³ , the melting peak temperature was 60 ° C., and the elution amount at 80 ° C. or lower by temperature rising elution fractionation (TREF) was 80 ° C. Was obtained as a linear ethylene / 1-hexene copolymer (LLDPE-2).

Examples 1 and 2 (1) (A) LDPE was used as the resin layer, and (B) LLDPE-1 or LLDPE-2 was used as the resin layer. After the agents were mixed well in a blender, they were melt extruded and pelletized to obtain a laminate resin. (2) A resin temperature of 250 ° C. and a width of 500 from a T-die mounted on an extruder of (A) LDPE of the resin layer of 90 mm in diameter and (B) resin layer of 65 mm in diameter of the laminated resin.
The two layers were melt-coextruded into a film having a thickness of 10 mm and a thickness of 10 μm for the (A) layer and 5 μm for the (B) layer so that the (A) resin layer surface became the substrate surface. (3) Next, a biaxially stretched polypropylene film (OP
P) [LOF2 (trade name) manufactured by Nimura Chemical Industry Co., Ltd.], an anchor coating agent was applied to one surface of the resin, dried, and then co-extruded in two layers into a film from each application surface and a T-die (A) resin. The layers between the layers were subjected to ozone treatment, and were pressure-bonded and laminated with a cooling roll and a compression rubber roll whose surfaces were matted.
A corona discharge treatment of 0 W · min / m ² was performed to obtain a laminated film. Table 1 shows the processability and the evaluation results of the laminated film at that time. (4) Next, the corona discharge treated surface of the obtained laminated film and the art paper subjected to offset printing were rolled at a roll temperature of 70,8.
A thermocompression bonding was performed at 0, 100 ° C., a linear pressure of 55.6 kg and a speed of 30 m / min to obtain a printed laminate product. (5) glossiness of the obtained printed laminate product,
Table 2 shows the evaluation results of the adhesive strength with the printed art paper and the tunneling property with the printed art paper.

Example 3 The adhesive layer resin was used, (A) EVA was used as the resin layer, and (B) LLDPE-1 was used as the resin layer.
mm, LLDPE-1 from a T-die mounted on a 65 mm extruder, resin temperature 240 ° C, width 500 mm, thickness (A) layer 10 μm, (B) layer 5 μm, film (A) resin layer surface A laminated film and a print-laminated product were obtained in the same manner as in Example 1 except that the two layers were melt-coextruded and manufactured so as to be on the substrate surface. Tables 1 and 2 show the evaluation results of the laminated film and the printed laminate product.

Example 4 Adhesive layer resin, (A) LLDPE as resin layer,
(B) LLDPE-1 is used as a resin layer, (A) LLDPE of the resin layer has a diameter of 90 mm, and (B) resin layer LLD.
A resin temperature of 250 ° C., a width of 500 mm, and a thick (A) layer 1 were obtained from a T-die having PE-1 mounted on an extruder having a diameter of 65 mm.
A laminated film and a print laminate product are produced in the same manner as in Example 1 except that the two layers are melt-coextruded so that the resin layer surface becomes the base material surface, and the resin layer is formed into a film with a thickness of 0 μm and (B) layer 5 μm. I got Tables 1 and 2 show the evaluation results of the laminated film and the printed laminate product.

Example 5 The adhesive layer resin was (A) HDPE as the resin layer, and (B)
Using LLDPE-1 as the resin layer, (A) H of the resin layer
DPE having a diameter of 90 mm and (B) resin layer LLDPE-1
From a T die attached to an extruder having a diameter of 65 mm, a resin temperature of 250 ° C., a width of 500 mm, a thickness (A) layer of 10 μm,
(B) a layer having a thickness of 5 μm and a film (A), except that the resin layer is melt-coextruded in two layers so that the resin layer surface becomes the substrate surface.
A laminated film and a printed laminated product were obtained in the same manner as in Example 1. Tables 1 and 2 show the evaluation results of the laminated film and the printed laminate product.

Comparative Example 1 (1) LLDPE-1 was mixed well with 0.5% of a phenolic stabilizer in a blender and then melt-extruded into pellets to obtain a laminate resin. (2) A resin temperature of 250 ° C., a width of 500 mm, and a T die attached to the extruder having a diameter of 90 mm.
It was melt-extruded into a film with a thickness of 15 μm. (3) A laminated film and a printed laminate product were manufactured in the same manner as in Example 1, and the evaluation results are shown in Tables 1 and 2.

Comparative Example 2 A resin composition consisting of 90% by weight of LLDPE-1 and 10% by weight of LDPE was mixed well with 0.5% by weight of a phenolic stabilizer in a blender and then melt-extruded into pellets to form a laminated resin. A laminated film and a printed laminate product were produced in the same manner as in Comparative Example 1 except that the evaluation was made, and the evaluation results are shown in Tables 1 and 2.

Comparative Example 3 Ethylene / vinyl acetate copolymer (EVA, "Novatech EVA LV570" manufactured by Nippon Polychem Co., Ltd. (trade name;
MFR 15 g / 10 min, vinyl acetate content 20% by weight))
Was used as a laminate resin, and a laminated film and a printed laminate product were produced in the same manner as in Comparative Example 1 except that the melt extrusion temperature was changed to 240 ° C., and the evaluation results are shown in Tables 1 and 2.

[0041]

[Table 1]

[0042]

[Table 2]

[0043]

The print laminating film of the present invention has two adhesive resin layers to be laminated on the thermoplastic resin film substrate, and the resin (B) of the adhesive layer thermally bonded to the printing surface of the printed body is differential. The melting peak temperature measured by scanning calorimetry (DSC) is 102 ° C. or less, preferably 92 ° C.
As low as the following, print lamination can be performed at a low temperature on the printing surface of the printed body, discoloration and curling of the printing ink of the print laminated product can be prevented, and the cut property of the laminated film during print lamination can be improved. Further, by co-extrusion of the two resin layers (A) and (B), a surging phenomenon during extrusion lamination processing can be prevented, and stable film formation can be performed.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) C08J 7/04 CEZ C08J 7/04 CEZE // C08L 101: 00

Claims (3)

[Claims] 1. A print laminating film comprising the following resin layer (A) in contact with one surface of a thermoplastic resin film substrate and a resin layer (B) laminated thereon. (A) resin: a density of 0.900 to 0.960 g / c
m ³ , an ethylene resin having an MFR of 1 to 100 g / 10 min. (B) resin: a density obtained by copolymerizing ethylene and an α-olefin having 3 to 12 carbon atoms is 0.870 to 0.910.
g / cm ³ , and a linear ethylene / α-olefin copolymer having an MFR of 1 to 100 g / 10 min. 2. The elution amount of the linear ethylene / α-olefin copolymer (B) in the resin layer at 80 ° C. or lower in the temperature rise elution fractionation (TREF) is 90 to the total amount of the copolymer.
The film for print lamination according to claim 1, which is not less than% by weight. 3. The print laminate film according to claim 1, wherein (B) the linear ethylene / α-olefin copolymer of the resin layer is polymerized using a metallocene compound as a polymerization catalyst.