JP2002113824A - Surface protective laminated film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface protective laminated film capable of molding a stable film without wrinkle at a film production time and without elongation or breakage of the laminated film at print laminating time without necessity of a solvent, heat adhering at a low temperature without necessity of an anchor coating agent coating at an extrusion laminating time and having no discoloring of a printing ink, no curl and improved cutting properties of the laminated film. SOLUTION: The surface protective laminated film comprises (A) a propylene polymer resin layer containing an α-olefin content of 0 to 5 wt.% and an MFR of 1 to 100 g/10 min and contacted with one side surface of a propylene resin film base, and (B) a linear ethylene α-olefin copolymer resin layer having a density of 0.870 to 0.910 g/cm3 and an MFR of 1 to 100 g/10 min and laminated on the resin layer (A).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film for protecting a surface, and more particularly, to a protective film used for protecting a surface of a printing paper or a photograph and adhered to a printing surface of a printing paper or the like by heat and pressure. It relates to a laminated film (film for print lamination).

[0002]

2. Description of the Related Art Laminating a film on a printing paper, a photograph, or the like is widely performed for the purpose of protecting the surface of the printing paper, a photograph, or the like, imparting water resistance or oil resistance, or improving the surface gloss. As such a film for print lamination, a stretched polypropylene film is used as a base film, and a solvent-type ethylene
Vinyl acetate copolymer adhesives are frequently used. However, in the method using a solvent-type adhesive, it is necessary to pay particular attention to solvent recovery and working environment rather than handling the solvent, and it is generally necessary to consider the pot life of the method because a curing agent is used. Was.

[0003] Without using organic solvents or adhesives,
Heat-bonding only the heat-sensitive adhesive surface of a biaxially stretched polypropylene laminated film and the adhesive surface of printing paper to which a heat-sensitive adhesive layer made of a mixture of at least one kind of ethylene-alkyl ester copolymer and ethylene-vinyl acetate copolymer has been applied. To manufacture a printed laminate product by laminating (Japanese Patent Application Laid-Open No. Sho 56-42652, Japanese Patent Publication No. Hei 4-2431).
And Japanese Unexamined Patent Publication No. 3-73341).

[0004] However, in order to meet the demand for easy adhesion to the printing surface, the ethylene-based copolymer resin of the heat-sensitive adhesive layer has a high content of functional monomers as much as possible. Is inferior in slipperiness and anti-blocking property. Further, the laminate film obtained by the method, during the production of the film, the roll release property is deteriorated, wrinkles are formed, and when the film is transported or stored in a wound state, the substrate surface and the ethylene-based copolymer resin overlapped. When the film is rewound and used for lamination printing, the bonding tension increases, and there is a problem that the laminated film is stretched or broken.

On the other hand, as a heat-sensitive adhesive layer, a film using a resin composition containing an ethylene-based resin in a linear ethylene / α-olefin copolymer catalyzed by a metallocene compound is applied only by thermocompression bonding. There is also a method of manufacturing a print laminate product in combination (Japanese Patent Application Laid-Open No. Hei 7-117197). However, linear ethylene α
-A laminated film obtained by laminating an olefin copolymer containing an ethylene-based resin is inferior in appearance (blurring) of a printed laminate product and low-temperature heat bonding strength. Further, this laminated film is inferior in the cut property of the laminated film at the time of print lamination.

Further, when only a linear ethylene / α-olefin copolymer alone is used as the heat-sensitive adhesive layer, there is an advantage that the appearance (fog) of the printed laminate product and the adhesive strength in low-temperature heat bonding are excellent. In addition, there is a problem that a surging phenomenon occurs during extrusion lamination processing on a film substrate, and film formation cannot be performed.

In order to improve the processability at the time of extrusion lamination, there is a method in which an ethylene resin and a linear ethylene / α-olefin copolymer are subjected to two-layer melt coextrusion lamination. In order to adhere the ethylene-based resin layer to the material, it is necessary to apply an anchor coat agent to the substrate. Since the anchor coating agent is a solvent-based agent, it is necessary to pay attention to solvent recovery, fire, and work environment for handling the solvent.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. That is, 1) no solvent odor is generated at the time of print lamination, no solvent removal and recovery device is required, and there is no need to consider the pot life of the curing agent. 2) wrinkles during film production, lamination during print lamination. No elongation or breakage of film, 3) Surge phenomenon during extrusion lamination is suppressed, and stable laminated film can be formed. 4) No need to apply an anchor coating agent during extrusion lamination, no solvent odor, 5) At the time of print lamination, it can be heated and bonded at a low temperature, there is no discoloration of the printing ink of the print laminate product, and
It is an object of the present invention to provide a laminated film for surface protection, which has no curl, 6) has excellent adhesive strength to printing paper, and 7) has excellent cutability of the laminated film during print lamination.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, laminated a specific propylene polymer on one surface of a propylene resin film base material, By laminating the linear ethylene / α-olefin copolymer of (1) so that it can be thermally bonded to the printing surface of the printed material, print lamination with the printed surface of the printed material at a low temperature is possible. The present inventors have found that discoloration and curling of the ink can be prevented, the cutability of the laminated film at the time of print lamination is improved, and the surging phenomenon at the time of extrusion lamination is prevented, and stable film formation can be performed.

That is, according to the first aspect of the present invention,
There is provided a laminated film for surface protection in which the following (A) resin layer is in contact with one surface of a propylene-based resin film substrate, and the (B) resin layer is laminated thereon. (A) Resin: a propylene polymer having an α-olefin content of 0 to 5% by weight as a comonomer and an MFR (230 ° C., 2.16 kg load) of 1 to 100 g / 10 minutes. (B) Resin: Density of 0.870 to 0.91 obtained by copolymerizing ethylene and an α-olefin having 3 to 12 carbon atoms.
0 g / cm ³ , MFR (190 ° C., 2.16 kg load)
Is a linear ethylene / α-olefin copolymer having a ratio of 1 to 100 g / 10 minutes.

According to the second aspect of the present invention, the first aspect is provided.
In the invention of (1), the resin (A) comprises 99 to 80% by weight of the propylene polymer and MFR (190 ° C., 2.16 kg).
The present invention provides a laminated film for surface protection, which is a resin composition containing 1 to 20% by weight of a high-pressure low-density polyethylene having a load of 1 to 50 g / 10 minutes.

Further, according to the third invention of the present invention, the first invention
In the invention of (1), the resin (A) comprises 98 to 80% by weight of the propylene polymer and MFR (190 ° C., 2.16 k
g load) is 1 to 20% by weight of a high-pressure method low-density polyethylene having a density of 0.900 g / cm.
³ or less and MFR (190 ° C, 2.16kg load)
Is 1 to 50 g / 10 min and ethylene has 3 to 1 carbon atoms.
2. A laminated film for surface protection, which is a resin composition containing 1 to 10% by weight of a copolymer with α-olefin (2).

Further, according to the fourth invention of the present invention, in the first to third inventions, the linear ethylene / α-olefin copolymer (B) is a resin having a temperature-rise elution fraction (TREF). )), Wherein the elution amount at 80 ° C. or less is 90% by weight or more based on the total amount of the copolymer, and the laminated film for surface protection is provided.

According to the fifth aspect of the present invention, the first aspect is provided.
In the fourth to fourth aspects, there is provided a laminated film for surface protection, wherein (B) a linear ethylene / α-olefin copolymer as a resin is polymerized using a metallocene compound as a polymerization catalyst.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Propylene-based resin film substrate The substrate used for the surface protection laminated film of the present invention is:
It is a non-stretched or stretched film of a polypropylene resin. The polypropylene-based resin that can be used is not limited, but can be selected from, for example, a propylene-based polymer that can be used in the resin layer (A) described below. The thickness of the substrate layer is preferably 6 to 100 μm,
More preferably, it is 7 to 40 μm. In the propylene-based resin film substrate, lubricant, anti-blocking agent,
Stabilizers, antioxidants, antistatic agents, antifogging agents, coloring agents, and other additives may be blended.

2. Adhesive Resin Layer The resin layer laminated on one side of the propylene resin film substrate of the present invention is composed of the following (A) propylene polymer resin layer and (B) linear ethylene It is an α-olefin copolymer resin layer.

(A) Propylene Polymer The propylene polymer used in the resin layer (A) of the present invention is:
It is a crystalline propylene homopolymer or a propylene / α-olefin random copolymer having an α-olefin content of 5% by weight or less. If the α-olefin content exceeds 5% by weight, the cut property of the laminated film is inferior. Also, MF
R (JIS K6921) is 1 to 100 g / 10 min, preferably 5 to 70 g / 10 min. MFR is 1g / 1
If the time is less than 0 minutes, the melt viscosity is too high, so that the thin-wall workability during extrusion lamination is insufficient. On the other hand, if the MFR exceeds 100 g / 10 minutes, the melt viscosity is too low, so that the neck-in increases and the moldability is poor. Examples of the α-olefin include ethylene, 1-butene, 1-hexene, 1-heptene, 1-octene, and 1-decene.

The propylene-based polymer used in the resin layer (A) of the present invention has an MFR of 1 to improve processability (surging phenomenon, neck-in, etc.) during extrusion lamination.
It can be used as a resin composition with high-pressure low-density polyethylene of up to 50 g / 10 min. At that time, the compounding ratio is 1 to 20% by weight of the high-pressure method low-density polyethylene based on 99 to 80% by weight of the propylene-based polymer. When the high-pressure low-density polyethylene is less than 1% by weight (the propylene-based polymer exceeds 99% by weight), the neck-in becomes large and the processability is inferior. Exceeds (80% of propylene-based polymer
% By weight), a surging phenomenon occurs.
Neither is preferred.

The propylene polymer used in the resin layer (A) of the present invention has a density of 0.900 g / cm in addition to the above in order to improve the appearance of the printed laminate product.
³ or less and MFR (190 ° C, 2.16kg load)
Is 1 to 50 g / 10 min and ethylene has 3 to 1 carbon atoms.
2 can be used as a resin composition containing 1 to 10% by weight of a copolymer with an α-olefin. When the compounding ratio of the copolymer of ethylene and the α-olefin having 3 to 12 carbon atoms to the resin composition is less than 1% by weight, the effect of improving the appearance is poor, while if it exceeds 10% by weight. Any of these is not preferable because the cut property of the laminated film is inferior.

The propylene-based polymer or the resin composition containing the propylene-based polymer includes a lubricant, an antiblocking agent,
Stabilizers, antistatic agents, antifogging agents, colorants, low molecular weight polymers, and other various additives may be added as necessary.
The polymerization method of the propylene-based polymer is not particularly limited,
Any of known methods such as a gas phase method, a bulk method and a solution method may be used, and the polymerization catalyst used is not particularly limited, either.
Known catalysts such as a Ziegler-Natta catalyst and a metallocene catalyst can be used.

(B) Linear Ethylene / α-Olefin Copolymer The linear ethylene / α-olefin copolymer used in the resin layer (B) of the present invention comprises ethylene and α-olefin having 3 to 12 carbon atoms.
-A copolymer obtained by copolymerizing an olefin.
Specifically, ethylene and one kind of α-
Binary copolymers obtained by copolymerizing olefins, and terpolymers obtained by copolymerizing ethylene with two kinds of α-olefins having 3 to 12 carbon atoms are exemplified. Examples of the α-olefin having 3 to 12 carbon atoms include propylene, 1-butene, 1-hexene, 1-heptene, 1-octene, 1-decene, and 1-dodecene. The above may be used.

The (B) linear ethylene / α-olefin copolymer has a density (JIS K6922) of 0.870.
８７0.910 g / cm ³ , preferably 0.875-0.
905 g / cm ³ , MFR (JIS K6921) is 1
-100 g / 10 min, preferably 2-80 g / 10 min.

If the linear ethylene / α-olefin copolymer has a density of less than 0.870 g / cm ³ , the blocking property is deteriorated, and there is a possibility that the laminated film may elongate or break during print lamination. Also, the cut property of the laminated film is poor. On the other hand, the density is 0.910 g / cm ³
When the ratio exceeds the above, the adhesiveness to the printing surface of the printed body and the appearance (blurring) of the printed laminate product are inferior. Also, MF
If the R is less than 1 g / 10 minutes, the melt viscosity is too high and the extensibility at the time of extrusion lamination is insufficient. Meanwhile, 1
If it exceeds 00 g / 10 minutes, the melt-in viscosity is too low, so that the neck-in becomes large and the moldability is poor.

(B) Linear ethylene / α used in the present invention
-Olefin copolymers can be produced by polymerization using a known titanium-based catalyst or metallocene catalyst, but copolymers produced by high-pressure ionic polymerization, gas-phase polymerization, and solution polymerization using a metallocene compound as a polymerization catalyst. It is preferable to use a polymer, and particularly preferable is a copolymer using a metallocene catalyst having the following physical properties.

That is, the amount of the linear ethylene / α-olefin copolymer eluted by temperature rise elution fractionation (TREF) is at least 90% by weight at 80 ° C. based on the total amount of the copolymer. Is preferred.

It should be noted that the temperature rise elution fractionation (Tempera)
true Rising Elution Fract
ionation: TREF) is described in “Jou
rnal of Applied Polymer S
science, Vol 26, 4217-4231.
(1981) "and" Polymer Paper Collection 2P1C09 "
(1985) "based on the principle described in the following. 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 formed by forming an easily crystallizable material on the inner side (the side closer to the surface of the inert carrier) and a hardly crystallizable material on the outer side. Next, when the temperature is continuously or stepwise increased, an amorphous portion in the polymer composition of interest in a low temperature stage,
In other words, the polymer elutes from the polymer with the short-chain branching with a high degree of branching, and as the temperature rises, the polymer with a low degree of branching elutes, and finally the linear portion without branching elutes, and the measurement is completed. I do. 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.

As the linear ethylene / α-olefin copolymer, those obtained by graft polymerization of maleic anhydride, styrene or the like can be used.

Further, the linear ethylene / α-olefin copolymer includes a lubricant, an antiblocking agent, a stabilizer,
Antistatic agents, antifogging agents, colorants, low molecular weight polymers, and other various additives may be added as necessary.

3. Thickness of Adhesive Resin Layer The thickness of the above-mentioned adhesive resin layer is preferably 6 μm or more, more preferably 7 to 80 μm, inclusive of the resin layer (A) and the resin layer (B). ) There is no restriction on the thickness ratio of the resin layer.

4. Method for Producing Laminated Film for Surface Protection The method for producing a laminated film for surface protection of the present invention can be applied to a two-layer melt coextrusion laminating method, a sandwich extrusion laminating method, a dry laminating method, etc., but is excellent in high-speed thin-wall moldability. Preferred is a two-layer melt coextrusion lamination method.
The processing temperature in this case is preferably 150 to 300 ° C,
The temperature is more preferably from 200 to 280 ° C.

The surface protective laminated film obtained above is subjected to (B) 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 sheet. Is preferred. In particular, corona treatment is the simplest and most effective.

The resin (B), which is the adhesive layer of the laminated film used for the heat-press printing laminate of the present invention, has a melting point (D).
SC method), and because it does not contain ethylene resin, print lamination can be performed at low temperature with the printed surface of the printed body, the adhesive strength with the print paper of the print laminate product increases, the discoloration of the printing ink, curl Can be prevented. In the extrusion laminating process, by co-extruding the resin layer (A) and the resin layer (B), a surging phenomenon can be prevented, a stable film can be formed, and adhesion to a propylene-based resin film substrate can be achieved. Strength becomes strong,
The cut property of the laminated film during print lamination is improved.

[0033]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples. The extrusion laminating processability, the characteristics of the laminated film, the method of evaluating the characteristics of the printed laminate product, and the resins used in the examples are as follows.

[0034]Evaluation method  1. Extrusion laminating processability The thickness of the laminated resin layer (total thickness in the case of co-extrusion) is 1
At 5 μm (set value), at a take-off speed of 200 m / min,
Surging phenomenon of molten resin extruded from b
Observation of the occurrence of thickness fluctuation of ± 5 μm or more in the
The following evaluation criteria evaluated. Good: No surging phenomenon occurred. Poor: Surging phenomenon occurred and extrusion lamination was not performed.
Difficult

2. Properties of laminated film (1) Anti-blocking property: width 21 cm, length 29 cm
Corona discharge treated surface of biaxially stretched film and laminated film
And the width is 15c in an oven at a temperature of 60 ° C.
m, 0.05 kg / cm over 20 cm length²No load
After applying the weight and leaving it for 24 hours,
10cm peeling area²(Width 2cm, length 5cm)
And peeled off with a tensile tester (tensile speed 50
0 mm / min) was measured. This value is small
About, the anti-blocking property is excellent, in the following range × ~ ◎
Was evaluated.Peeling load (kg / 10cm ² ) Evaluation  2 kg or more (laminated film is cut) × 1.5 to less than 2 kg (laminated film is fully stretched) △ 1.0 to less than 1.5 kg (elongation of laminated film is restored) ○ Less than 1.0 kg ◎

(2) Adhesive strength to base material: The laminated film was cut into a test piece having a width of 15 mm and a length of 100 mm, and a length of 50 mm was peeled off by hand. Shows the value of tensile strength peeled at a tensile speed of 300 mm / min.

(3) Elmendorf Tear Strength: The laminated film for surface protection was measured by a plastic film and sheet tear test method (JIS K7128 B method Elmendorf tear method).

3. Characteristics of Printed Laminate Products (1) Gloss and fog:
The glossiness (20 degrees) of the printing part was measured using UGV manufactured by Suga Test Instruments Co., Ltd.
-5DP (trade name) indicates the value measured.
Properties (adhesion between printing paper and laminated resin) are as smooth
The condition was visually observed and evaluated according to the following evaluation criteria.External appearance Evaluation  There is no residual air and the print color is clear ○ 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 ×

(2) Adhesive strength: A 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.

(3) Tunneling property: Print laminating
Light oil with a micro syringe on the non-bonded surface of the printing paper of the product
100 µl is dropped and the atmosphere is at 23 ° C and 50% humidity
Leave it on the bottom and observe the change of the laminated film surface after 24 hours
And evaluated according to the following evaluation criteria.Tunneling properties Evaluation  There is no problem in the adhesive strength and appearance. ◎ The adhesive strength is slightly reduced, but there is no change in appearance (to the extent that it can be used). ○ Slightly bumpy. △ Clear tunneling.

[0041]Extrusion laminating resin  (1) Propylene polymer (PP) Novatec FL25RC (product of Nippon Polychem Co., Ltd.)
Name), ethylene content: 4.4% by weight, MFR: 23 g
/ 10 min (2) Ethylene / 1-hexene copolymer (LLDPE-
1) Kernel KS560 (product of Nippon Polychem Co., Ltd.)
Name), MFR: 16.5 g / 10 min, density: 0.898
g / cm³, Temperature rise elution fractionation (TREF) 80 ° C or less
Elution amount under: 100% by weight (3) Ethylene / 1-hexene copolymer (LLDPE-
2) Kernel KJ6400 (product of Nippon Polychem Co., Ltd.)
Name), MFR: 30 g / 10 min, density: 0.880 g /
cm³, Temperature rise elution fractionation (TREF) below 80 ° C
Eluted amount: 100% by weight

(4) High pressure method low density polyethylene (LDP)
E) Novatec LC701 (trade name) manufactured by Nippon Polychem Co., Ltd., MFR: 14 g / 10 min, density: 0.919 g /
cm ³ , ethylene content: 100% by weight (5) Ethylene. Vinyl acetate copolymer (EVA) Novatec LV570 (trade name) manufactured by Nippon Polychem Co., Ltd., MFR: 15 g / 10 minutes, vinyl acetate (VA) content: 20% by weight

Example 1 (1) The resin (A) was replaced with PP of the laminated resin, and (B)
Resin is LLDPE-1, each having a diameter of 65 m
m from the T die attached to the extruder, the resin temperature is 250 ° C,
Two layers were melt-coextruded in a film shape with a width of 500 mm and a thickness of the resin layer of 7 μm (A) and a resin layer of 8 μm (B) such that the resin layer surface becomes the substrate surface. (2) Next, a 15-μm-thick biaxially-stretched polypropylene film [LOF2 (trade name) manufactured by Nimura Chemical Industry Co., Ltd.] is unwound from the unwinding portion of the substrate of the extrusion laminating apparatus. The resin layer (A) melt-coextruded in (1) was used as a substrate surface, and a cooling roll and a compression rubber roll, each of which had a matte surface, were pressure-bonded and laminated.
Min / m ² of corona discharge treatment to obtain a laminated film. Table 1 shows the processability and the evaluation results of the laminated film at that time. (3) 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. (4) Extrusion laminating processability, adhesion strength between the base material of the laminated film and (A) resin layer, anti-blocking property are shown in Table 1,
Table 2 shows the evaluation results of the glossiness of the print laminate product, the adhesive strength with the printed art paper, and the tunneling property with the printed art paper.

Example 2 (1) The resin (B) was prepared by using LLDPE-
A laminated film and a print-laminated product were obtained in the same manner as in Example 1 except that No. 2 was used. The evaluation results are shown in Tables 1 and 2.

Comparative Example 1 (1) The resin (A) and the resin (B) were used as the above-mentioned laminated resin LLDPE-1, each having a diameter of 65 mm.
Resin temperature 250 ° C., width 500 mm, thickness (A) resin layer 7 μm, (B) resin layer 8
In μ, 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 so that the resin layer surface (A) became the substrate surface in the form of a film. The evaluation results are shown in Tables 1 and 2.

Comparative Example 2 (1) The resin (A) was used for the LDPE of the laminated resin and the resin (B) was used for the LLDPE-
As 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) of a resin layer of 7 μm, and a (B) resin layer of 8 μm were used to form a film (A). A laminated film and a print-laminated product were obtained in the same manner as in Example 1 except that melt co-extrusion was performed in two layers so that the layer surface became the substrate surface. The evaluation results are shown in Tables 1 and 2.

Comparative Example 3 (1) The resin (A) was used for the LDPE of the laminated resin and the resin (B) was used for the LLDPE-
As 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) of a resin layer of 7 μm, and a (B) resin layer of 8 μm were used to form a film (A). Melt co-extrusion was performed in two layers so that the layer surface became the substrate surface. (2) Next, a 15 μm-thick biaxially-stretched polypropylene film [LOF2 (trade name) manufactured by Nimura Chemical Industry Co., Ltd.] is fed from the feed-out portion of the substrate of the extrusion laminating apparatus, and an anchor coating agent is applied to one side of the film and dried. After that, ozone treatment is applied between the application surface and the resin layer melt-coextruded into a film form from the T-die, pressure-laminated with a cooling roll and a compressed rubber roll having a matte surface, and further on the surface of the resin layer of the laminated film. Example 1 except that a corona discharge treatment of 20 W · min / m ² was performed to obtain a laminated film.
In the same manner as described above, a laminated film and a printed laminate product were obtained. The evaluation results are shown in Tables 1 and 2.

Comparative Example 4 (1) Laminated resin LLDPE-1: 90% by weight
And a mixture of LDPE: 10% by weight was passed through a T-die mounted on an extruder having a diameter of 90 mm, and a resin temperature of 250 ° C. and a width of 5 mm.
It was melt-extruded in one layer into a film with a thickness of 00 mm and a thickness of 15 μm. (2) Next, a 15 μm-thick biaxially-stretched polypropylene film [LOF2 (trade name) manufactured by Nimura Chemical Industry Co., Ltd.] is fed from the feed-out portion of the substrate of the extrusion laminating apparatus, and an anchor coating agent is applied to one side of the film and dried. After that, ozone treatment is applied between the application surface and the resin layer melt-coextruded into a film form from the T-die, pressure-laminated with a cooling roll and a compressed rubber roll having a matte surface, and further on the surface of the resin layer of the laminated film. Example 1 except that a corona discharge treatment of 20 W · min / m ² was performed to obtain a laminated film.
In the same manner as described above, a laminated film and a printed laminate product were obtained. The evaluation results are shown in Tables 1 and 2.

Comparative Example 5 (1) EVA of the above-mentioned laminated resin was fed from a T-die mounted on an extruder having a diameter of 90 mm to a resin temperature of 240 ° C. and a width of 5 mm.
It was melt-extruded in one layer into a film with a thickness of 00 mm and a thickness of 15 μm. (2) Next, a 15 μm-thick biaxially-stretched polypropylene film [LOF2 (trade name) manufactured by Nimura Chemical Industry Co., Ltd.] is fed from the feed-out portion of the substrate of the extrusion laminating apparatus, and an anchor coating agent is applied to one side of the film and dried. After that, ozone treatment is applied between the application surface and the resin layer melt-coextruded into a film form from the T-die, pressure-laminated with a cooling roll and a compressed rubber roll having a matte surface, and further on the surface of the resin layer of the laminated film. Example 1 except that a corona discharge treatment of 20 W · min / m ² was performed to obtain a laminated film.
In the same manner as described above, a laminated film and a printed laminate product were obtained. The evaluation results are shown in Tables 1 and 2.

[0050]

[Table 1]

[0051]

[Table 2]

[0052]

As described above, the laminated film for surface protection of the present invention comprises an adhesive resin layer laminated on a propylene resin film substrate.
The resin (B) of the adhesive layer, which is formed into a layer and is heat-pressed to the printing surface of the printed body (photograph), is a linear ethylene / α-olefin copolymer alone, has a low melting peak temperature, And has excellent adhesiveness to the product printing paper which is heat-pressed to printing paper or the like, and can prevent discoloration and curling of the printing ink. Further, by co-extruding the resin layer (A) and the resin layer (B), it is possible to prevent a surging phenomenon at the time of extrusion lamination, to form a stable film, and to apply an anchor coating agent to the film substrate. Adhesion between the substrate and the resin can be performed without application, and the cut property of the laminated film is improved.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F100 AK06B AK07A AK63B AK63C AK63K AK64B AK66B AL05B GB90 JA06B JA06C JA13C JA20C JK06 JL01 JL04 JL12 YY00B 4J002 BB032 BB053 BB111 BB121GF00

Claims (5)

[Claims] 1. A surface protection laminated film comprising a propylene-based resin film substrate and a resin layer (A) in contact with one surface of the substrate and a resin layer (B) laminated thereon. (A) Resin: a propylene polymer having an α-olefin content of 0 to 5% by weight as a comonomer and an MFR (230 ° C., 2.16 kg load) of 1 to 100 g / 10 minutes. (B) Resin: Density of 0.870 to 0.91 obtained by copolymerizing ethylene and an α-olefin having 3 to 12 carbon atoms.
0 g / cm ³ , MFR (190 ° C., 2.16 kg load)
Is a linear ethylene / α-olefin copolymer having a ratio of 1 to 100 g / 10 minutes. 2. A high-pressure low-density polyethylene (A) in which the resin (A) is 99 to 80% by weight of the propylene polymer and has an MFR (190 ° C., 2.16 kg load) of 1 to 50 g / 10 minutes. The laminated film for surface protection according to claim 1, which is a resin composition containing 0.1% by weight. 3. A method according to claim 1, wherein the resin comprises 98 to 80% by weight of the propylene polymer and MFR (190 ° C., 2.16 kg).
Load) is 1 to 20% by weight of high-pressure low-density polyethylene having a density of 0.950 g / cm ^3.
Ethylene having an MFR (190 ° C., 2.16 kg load) of 1 to 50 g / 10 min and carbon number of 3 to 12
The laminated film for surface protection according to claim 1, which is a resin composition containing 1 to 10% by weight of a copolymer with α-olefin. 4. The resin (B), which is a linear ethylene / α-
Olefin copolymer is separated by temperature rise elution (TREF)
The laminated film for surface protection according to any one of claims 1 to 3, wherein an elution amount at 80 ° C or less is 90% by weight or more based on the total amount of the copolymer. 5. The resin (B), which is a linear ethylene.α-
The laminated film for surface protection according to any one of claims 1 to 4, wherein the olefin copolymer is polymerized using a metallocene compound as a polymerization catalyst.