JP2007039576A - Surface protection film, sticking surface protection film and laminated sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated sheet having a surface protection film simultaneously realizing good slip resistance, abrasion resistance and fouling resistance when being used by sticking onto a floor face. <P>SOLUTION: The surface protection film is made of a mixed resin consisting of a polypropylene based resin and a thermoplastic elastomer based resin by the mass ratio of the polypropylene resin over the thermoplastic elastomer of 60:40-80:20. The laminated sheet 20 is prepared by laminating a sticking layer 2, a printing sheet 3, a pressure-sensitive adhesive layer 4 and a second release sheet 12 in this order onto the rear face of the surface protection film 1 whose surface has a surface roughness Ra of 0.3-4.0 μm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a surface protective film, an adhesive surface protective film, and a laminated sheet.

Conventionally, an adhesive sheet on which a pattern such as an advertisement or a guide sign is printed may be adhered to a floor surface of a store or the like. There are various conventional surface protective films for protecting the printing surface of such a sheet. For example, polyvinyl chloride resin films and PET (polyethylene terephthalate) resin films are used.
In addition, as an adhesive sticking sheet suitable for use by adhering to the floor surface, a print receiving adhesive sheet capable of printing a pattern, and a surface for protecting the surface of the printed receiving adhesive sheet after printing An adhesive sheet combination in combination with a protective adhesive sheet is disclosed (Patent Document 1 below). This surface protective pressure-sensitive adhesive sheet is composed of a transparent surface resin layer containing an inorganic particle whose hardness is higher than that of the cured product in the cured product of the ionizing radiation curable resin, on the back surface thereof, A transparent base sheet made of a thermoplastic resin, a transparent pressure-sensitive adhesive layer, and a release sheet are sequentially laminated.
JP 2005-70686 A

In the case of a sheet that is stuck to the floor surface, people walk on it, so it is not preferable if the surface slips too well or the slippage is too high. However, it is not easy to satisfy these characteristics at the same time.
Polyvinyl chloride resin film is excellent in transparency and anti-slip performance as a surface protection film, but because it contains chlorine, it generates a toxic gas during incineration and has a heavy impact on the environment. Has drawbacks.
On the other hand, the PET-based resin film does not contain chlorine in the raw material and has a small environmental load, but lacks flexibility, so that the anti-slip performance is insufficient compared to the polyvinyl chloride-based resin film.
The adhesive sheet described in Patent Document 1 has an outermost surface made of a cured product of an ionizing radiation curable resin containing inorganic particles for the purpose of improving wear resistance. Not.

  The present invention has been made in view of the above circumstances, and when used by sticking to a floor surface, a surface protective film and an adhesive surface capable of simultaneously realizing good anti-slip properties, abrasion resistance, and antifouling properties It aims at providing a protective film and a lamination sheet.

  In order to solve the above problems, the surface protective film of the present invention is a film composed of a mixed resin of a polypropylene resin and a thermoplastic elastomer resin, and the mass ratio of the polypropylene resin: the thermoplastic elastomer resin is 60:40 to 80:20, and the surface roughness Ra of the film surface is 0.3 to 4.0 μm.

The polypropylene resin comprises a random polypropylene copolymer, or a mixed resin of a random polypropylene copolymer and a homopolypropylene resin, and the mass ratio of the random polypropylene copolymer: homopolypropylene resin is 100: 0. 60:40, and the thermoplastic elastomer resin is preferably a hydrogenated styrene copolymer.
The thickness of the surface protective film is preferably 60 to 200 μm.

The present invention provides an adhesive surface protective film in which a first release sheet is laminated on the back surface of the surface protective film of the present invention via an adhesive layer.
Moreover, this invention provides the lamination sheet by which the sticking layer, the printing sheet, the adhesive layer, and the 2nd peeling sheet are laminated | stacked in this order on the back surface of the surface protection film of this invention.

  According to the present invention, there are provided a surface protective film, an adhesive surface protective film, and a laminated sheet that can simultaneously realize good anti-slip properties, abrasion resistance, and antifouling properties when used by being adhered to a floor surface. can get.

[Surface protective film and adhesive surface protective film]
FIG. 1 shows one embodiment of an adhesive surface protective film 10 of the present invention, and a surface protective film 1, an adhesive layer 2, and a first release sheet 11 are laminated in this order from the surface side. .

<Surface protection film 1>
The surface protective film 1 is a film made of a mixed resin A of a polypropylene resin and a thermoplastic elastomer resin.
The polypropylene resin used in the present invention is not particularly limited, and is a homopolypropylene composed of a propylene monomer, a random polypropylene copolymer obtained by randomly copolymerizing another olefin monomer such as ethylene with a propylene monomer, or a block. Examples thereof include a copolymerized block polypropylene copolymer. These resins may be used alone or in admixture of two or more.
Among these, a random polypropylene copolymer or a mixed resin of a random polypropylene copolymer and a homopolypropylene resin is preferable from the viewpoints of transparency, whitening prevention at the time of film folding, and slip resistance. As for the mixing ratio of the random polypropylene copolymer and the homopolypropylene resin, the mass ratio of the random polypropylene copolymer: the homopolypropylene resin is preferably 100: 0 to 60:40, and more preferably 100: 0 to 75:25.
The polypropylene resin preferably has a melt flow rate (JIS K 6758 (230 ° C., 21.2 N)) of 0.1 to 50 g / 10 minutes, preferably 0.3 to 15 g / 10 minutes from the viewpoint of film moldability. Is more preferable.

Examples of the thermoplastic elastomer resin used in the present invention include ethylene propylene rubber, polyisoprene rubber, polybutadiene rubber, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, Ethylene-methyl acrylate copolymer, styrene-ethylene-styrene block copolymer, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-butadiene rubber, hydrogenated styrene-butadiene Hydrogenated hydrogenated styrene copolymers such as rubber and hydrogenated styrene-isoprene-styrene block copolymers, olefinic thermoplastic elastomers, styrene thermoplastic elastomers, urethane thermoplastic elastomers, polyesters Such systems thermoplastic elastomer. These resins may be used alone or in admixture of two or more.
Among these thermoplastic elastomer resins, hydrogenated styrene copolymers such as hydrogenated styrene-butadiene rubber and hydrogenated styrene-isoprene-styrene block copolymer are preferable from the viewpoint of transparency, and particularly hydrogen. Added styrene-butadiene rubber is preferred.

  The mixing ratio of the polypropylene resin and the thermoplastic elastomer resin in the mixed resin A (polypropylene resin: mass ratio of the thermoplastic elastomer resin) is 60: 40-80: 20, and 65: 35-75: 25. Is preferred. By setting the mixing ratio of the polypropylene resin to 60 parts by mass or more, good abrasion resistance and antifouling properties of the film can be obtained, and by setting it to 80 parts by mass or less, good slip resistance of the film can be obtained, Good flexibility is obtained, whitening when the film is folded is prevented, and the printed surface is clear.

  In the surface protective film of the present invention, in addition to the polypropylene resin and the thermoplastic elastomer resin, various additives as necessary, for example, antioxidants such as phenols and phosphites, higher fatty acids, higher Alcohols, higher fatty acid esters, fatty acid metal salts, lubricants such as fatty acid amides, UV absorbers such as benzophenone and benzotriazole, light stabilizers such as HALS, polyethylene glycol esters, polyethylene glycol ethers, fatty acid esters or ethanolamides, mono and diglycerides Further, an antistatic agent such as ethoxyl fatty acid amide and a filler such as talc and calcium carbonate can be added within a range not impairing the performance.

  When forming the surface protective film of the present invention, the above-described polypropylene resin, thermoplastic elastomer resin, and a simple mixture of the additives added as necessary are used as materials. Alternatively, those previously melt-kneaded by a kneader may be used. As the kneader used here, a known apparatus can be used, but a roll, an extruder, a kneader, a plaretary mixer, a Banbury mixer, etc. that are easy to handle and suitable for uniform dispersion are preferably used.

  The surface protective film of the present invention can be formed by a known molding method such as calendar molding, T-die extrusion molding or inflation molding. According to the composition of the surface protective film of the present invention, it is possible to perform high-speed molding even in calendar molding. Therefore, a method of forming a film by calendar molding is advantageous.

  The surface protective film of the present invention may be subjected to a surface treatment for preventing soiling and / or improving abrasion resistance, as long as the effects of the present invention are not impaired. Examples of the surface treatment agent include acrylic, urethane, silicone, and fluorine waxes.

The surface roughness Ra of the surface (outermost surface) 1a of the surface protective film 1 of the present invention is in the range of 0.3 to 4.0 μm, and preferably in the range of 0.5 to 2.0 μm. If the surface roughness Ra is too small, the film surface is smooth and the slip resistance is too high, and a good anti-slip property can be obtained by setting it to 0.3 μm or more. Further, by setting the surface roughness Ra to 4.0 μm or less, good wear resistance, antifouling properties, and transparency can be obtained.
The surface roughness Ra in the present invention is a center line average roughness representing the surface roughness of an industrial product described in JIS B 0601-1982 “Surface Roughness Standard”.
As a method for adjusting the surface roughness Ra of the surface protective film 1, for example, when embossing is performed on the surface of the surface protective film 1, the depth of unevenness in a mold such as an embossing roll may be adjusted.

  The thickness of the surface protective film 1 is preferably in the range of 60 to 200 μm, more preferably 80 to 150 μm. When the thickness is 60 μm or more, good wearability is obtained, and durability that sufficiently protects printed matter and the like is obtained. On the other hand, favorable transparency is obtained by setting it as 200 micrometers or less.

<Adhesion layer>
The adhesive layer 2 of the adhesive surface protective film 10 is formed from an adhesive such as an adhesive or a pressure-sensitive adhesive. Here, the adhesive loses its tackiness by being cured after sticking, and the pressure-sensitive adhesive maintains a certain degree of tackiness even after sticking.
Adhesives include natural rubber, synthetic rubber, acrylic, vinyl acetate, cyanoacrylate, silicone, urethane, various adhesives, styrene block copolymers, ethylene-vinyl acetate copolymers, etc. Examples include various hot melt adhesives. Among these, an acrylic adhesive is preferable because it is colorless and highly transparent.
Examples of the pressure-sensitive adhesive include rubber-based, acrylic-based, urethane-based, and vinyl ether-based pressure-sensitive adhesives. Among these, acrylic adhesives are preferred because of their excellent transparency and the like, and acrylic adhesives include emulsion types, solvent types, hot melt types, etc. Can be used. Among these, a solvent-type acrylic pressure-sensitive adhesive is preferable in that good adhesion to the surface protective film 1 can be obtained. A solvent-type acrylic pressure-sensitive adhesive is also preferable from the viewpoints of adhesive strength, water resistance, and weather resistance.
When using an adhesive, a tackifier may be added. Examples of the tackifier include rosin resins, terpene resins, aliphatic petroleum resins, aromatic petroleum resins, hydrogenated petroleum resins, styrene resins, alkylphenol resins, and the like.

  The thickness of the adhesive layer 2 is preferably 10 to 100 μm, more preferably 15 to 75 μm, and particularly preferably 20 to 50 μm. If the thickness of the sticking layer 2 is 10 μm or more, a sufficient sticking force can be secured, and if it is 100 μm or less, it is economical because the thickness is not more than necessary.

<First release sheet>
Examples of the first release sheet 11 include those in which a release agent is coated on a release sheet substrate and a release surface is formed. Here, the release sheet base material may be a natural paper base material or a plastic base material, for example, glassine paper, fine paper, coated paper, clay coated paper, kraft paper, polyethylene, Examples thereof include plastic films such as polypropylene, polyethylene terephthalate, and polyamide, laminated paper obtained by laminating these plastics on one or both sides, metal foil, or a laminate of metal foil and paper, plastic film, and the like.
Examples of the release agent that forms the release surface include a silicone resin, a fluororesin, an aminoalkyd resin, and a polyester. Among these, a silicone resin is preferable because of excellent peelability. These release agents are used as an emulsion, a solvent type or a solventless type.

<Manufacturing method>
For example, the adhesive surface protective film 10 of the present embodiment is formed by applying and drying the adhesive layer 2 on the back surface of the surface protective film 1, and then overlaying the first release sheet 11 thereon, or It can manufacture by the method of bonding together what formed the adhesion layer 2 on the 1st peeling sheet 11, and the surface protection film 1 manufactured separately.
In any method, for example, a dry laminating method, a wet laminating method, a print laminating method, a cold laminating method, a hot press laminating method, a hot melt laminating method, an extrusion laminating method and the like can be applied.

The surface protective film 1 can be produced by itself and used by sticking the surface protective film 1 on the surface of a printing sheet or the like using a separately prepared adhesive or the like during construction.
Or as shown in FIG. 1, if the sticking surface protection film 10 of the form by which the 1st peeling sheet 11 was laminated | stacked via the sticking layer 2 on the back surface of the surface protection film 1 beforehand, There is no need to prepare a separate adhesive, and the surface protective film 1 can be easily and quickly applied onto the surface of a printed sheet or the like by simply removing the first release sheet 11 and exposing the adhesive layer 2. Can be used.

The surface protective film 1 is composed of a mixed resin A of a polypropylene resin and a thermoplastic elastomer resin, and has a specific surface roughness Ra to simultaneously achieve good anti-slip properties, wear resistance, and antifouling properties. Can do. Accordingly, the surface protective film 1 has characteristics suitable as the outermost layer of the film adhered to the floor surface. Moreover, it can manufacture from the raw material which does not contain chlorine, and its environmental impact is small.
Furthermore, the surface protection film 1 has excellent transparency and good flexibility, and is less likely to be whitened when the film is bent. Therefore, the surface protective film 1 is suitable for use by being laminated on a printed material, and can protect the printed surface in a clear state. In particular, it is suitable for protecting printed matter stuck to the floor surface.
Since the thickness of the surface protective film 1 is thin, good transparency can be obtained, and there is also an advantage that a difference in level from the adherend surface can be reduced when it is stuck on an adherend such as a floor surface.

[Laminated sheet]
FIG. 2 shows one embodiment of the laminated sheet 20 of the present invention. From the surface side, the surface protective film 1, the adhesive layer 2, the printing sheet 3, the pressure-sensitive adhesive layer 4, and the second release sheet 12 are shown. Are sequentially stacked.
2, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

<Print sheet>
As the printing sheet 3, for example, papers, films, synthetic papers and the like can be used. Examples of paper include cast-coated paper, art paper, coated paper, high-quality paper, craft paper, and glassine paper. Films include polyethylene, polypropylene, ethylene-vinyl acetate copolymer (EVA), polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polyvinylidene chloride, polystyrene, styrene-acrylic copolymer, polycarbonate, cellophane, acetate, etc. And various polymer films. Examples of the synthetic paper include paper (Yupo, etc.) in which a large number of microvoids are formed by biaxial stretching of polypropylene, polyethylene terephthalate, or the like.
Further, as the printing sheet 3, vapor-deposited paper, cloth, non-woven fabric, metal foil or the like can be used. Furthermore, these laminated bodies etc. can also be employ | adopted suitably.
Although the thickness of the printing sheet 3 is based also on a material, it is preferable that it is 20-1,000 micrometers, It is more preferable that it is 25-500 micrometers, It is especially preferable that it is 30-300 micrometers.

On the surface 3a (surface on the surface protective film 1 side) of the printing sheet 3, for example, a picture, a character, a photograph, or the like can be printed with printing ink. Printing may be performed on the entire surface of the printing sheet surface 3a or may be printed on a part thereof.
Printing methods include inkjet, thermal transfer, thermal recording, laser recording, electrophotography, letterpress printing, gravure printing, flexographic printing, solvent offset printing, UV curable offset printing, silk screen Examples include printing methods.
Moreover, when the printing sheet 3 has transparency, you may print on the back surface 3b of a printing sheet.

<Adhesive layer>
As the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 4, for example, any pressure-sensitive adhesive such as rubber, acrylic or vinyl ether can be used. Among these, an acrylic pressure-sensitive adhesive is preferred because of excellent transparency, weather resistance, and heat resistance.
As the acrylic pressure-sensitive adhesive, there are an emulsion type, a solvent type, a hot melt type, and the like, and any type can be used in the present invention. Among these, a solvent-type acrylic pressure-sensitive adhesive is preferable from the viewpoints of adhesiveness, water resistance, and weather resistance. Furthermore, a solvent-type acrylic pressure-sensitive adhesive is preferable in terms of good adhesion to an olefin resin.
The thickness of the pressure-sensitive adhesive layer 4 is preferably 5 to 50 μm, and more preferably 15 to 30 μm from the viewpoint of preventing the phenomenon that the pressure-sensitive adhesive layer 4 protrudes from the end face of the sheet (so-called ooze) and the adhesive force. .

  Moreover, since the workability | operativity at the time of peeling from the to-be-adhered body (for example, floor surface) becomes higher, it is preferable that the adhesive layer 4 has removability. Examples of a method for imparting removability to the pressure-sensitive adhesive layer 4 include a method using a removable pressure-sensitive adhesive as the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 4, and the surface of the pressure-sensitive adhesive layer 4 on the second release sheet 12 side. And a method of reducing the contact area with the adherend by forming irregularities on the surface.

<Second release sheet>
The same material as the first release sheet 11 can be used for the second release sheet 12. The second release sheet 12 has a release surface, and is provided with a raised portion and a perforated structure on the release surface side by a known perforation process disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-323824. Those are preferred.
When the second release sheet 12 is provided with a raised portion and a perforated structure on the surface, the surface shape of the second release sheet 12 is transferred to the pressure-sensitive adhesive layer 4, and the surface of the pressure-sensitive adhesive layer 4. In addition, a large number of small depressions and small protrusions can be formed. As a result, when the laminated sheet 20 is attached to the adherend, it is possible to prevent blisters caused by air remaining between the two, and the contact area between the adhesive layer 4 and the adherend is reduced. Peelability is improved.

  Specifically, when a large number of small depressions and small protrusions are formed on the surface of the pressure-sensitive adhesive layer 4, the second release sheet 12 of the laminated sheet 20 is peeled off and the pressure-sensitive adhesive layer 4 is attached. When the body is lightly brought into contact with the body, the small protrusions of the pressure-sensitive adhesive layer 4 first adhere to the adherend, and a gap communicating with the outside is formed between the surface of the pressure-sensitive adhesive layer 4 and the surface of the adherend. As a result, most of the air between the pressure-sensitive adhesive layer 4 and the adherend can be extracted to the outside through the gap communicating with the outside, and large non-uniform blisters are not generated at the time of application. Further, since minute air remaining between the pressure-sensitive adhesive layer 4 and the adherend is accumulated in the small depressions of the pressure-sensitive adhesive layer 4, the work can be performed without impairing the appearance at all.

Further, when the pressure-sensitive adhesive layer 4 is strongly pressure-bonded to the adherend, there is no gap between the pressure-sensitive adhesive layer 4 and the adherend, and a strong adhesive strength can be obtained. Furthermore, even during strong pressure bonding, since the small depression is not bonded to the adherend, the gas generated over time when the adherend is plastic will accumulate uniformly in this small depression, Large and uneven blisters do not occur after construction, and the appearance is not significantly impaired.
In particular, when the adherend is a floor surface, if there is a bulge, it may be difficult to walk on it, and as described above, a bulge may occur between the adherend and the adherend. It is preferable that it can be constructed without any problems.
Furthermore, in the state where the pressure-sensitive adhesive layer 4 is lightly adhered to the adherend, only the small protrusions are in close contact with the adherend, so that the contact area is small. For this reason, it is easy to peel off and re-paste when re-paste. Moreover, the fall of the adhesive strength accompanying peeling can also be suppressed.

Of both surfaces of the second release sheet 12, the surface that is in close contact with the pressure-sensitive adhesive layer 4 is preferably smooth before the perforation process, but is made rough for the purpose of controlling the release performance. Is also possible.
Before applying the release agent on the second release sheet 12, the surface of the second release sheet 12 may be subjected to surface treatment such as corona discharge, flame treatment, ozone treatment or the like.
The thickness of the second release sheet 12 is preferably 5 to 150 μm, more preferably 10 to 130 μm, from the viewpoints of handling strength, ease of perforation, and the like.

<Manufacturing method>
The laminated sheet 20 of this embodiment can be manufactured, for example, by the following method.
First, (1) a laminated body in which the second release sheet 12 is laminated on the back surface 3b of the printing sheet 3 (the surface opposite to the surface on which the printing layer is formed) via the pressure-sensitive adhesive layer 4 is formed. As a specific method, the pressure-sensitive adhesive layer 4 is formed on the back surface 3 b of the printing sheet 3, and the second release sheet 12 is superposed on the pressure-sensitive adhesive layer 4. A method of laminating and integrating the agent layer 4 and the printing sheet 3 can be used.
Next, (2) printing is performed on the surface 3a of the printing sheet 3 to form a printing layer.
Next, (3) the adhesive layer 2 is formed on the surface 3a (surface on which the printed layer is formed) of the printing sheet 3, and the surface protective film 1 is bonded thereon.
Moreover, it replaces with the process of said (3), (3 ') The 1st peeling sheet 11 is peeled off and removed from the adhesive surface protection film 10 shown in FIG. A laminate having the adhesive layer 2 provided on the surface opposite to the surface forming the surface of 20 is separately prepared, and the adhesive layer 2 of this laminate and the surface 3a of the printing sheet 3 (printing layer is formed). May be bonded together.
In any case, for example, a dry laminating method, a wet laminating method, a print laminating method, a cold laminating method, a hot press laminating method, a hot melt laminating method, an extrusion laminating method and the like can be applied.

  In the laminated sheet 20 of the present embodiment, since the surface protective film 1 is laminated on the printing surface 3a of the printing sheet 3, the printed surface is protected in a clear state and has a good anti-slip property on the outermost surface. Abrasion resistance and antifouling properties can be obtained at the same time. Therefore, the laminated sheet 20 is suitable for uses such as an advertising sheet that is used by being stuck to a floor surface.

(Production Example 1)
60 parts by mass of a random polypropylene copolymer (manufactured by Sun Allomer, melt flow rate (230 ° C., 21.2 N) 9.5 g / 10 min) and hydrogenated styrene-butadiene rubber (HSBR) (manufactured by JSR, melt A film was produced by a general calendar molding method using a resin composition containing 40 parts by mass of a flow rate (230 ° C., 21.2 N) 3.5 g / 10 min). At the time of calender molding, the resin composition was uniformly mixed with a Henschel mixer and kneaded with a Banbury mixer until the resin temperature reached 180 ° C. to prepare a resin composition. This was rolled using an inverted L-shaped four-roll calender molding machine adjusted to 200 ° C., and taken through a cooling process to produce a film having a thickness of 80 μm and a width of 1120 mm. The surface of the obtained film was embossed. Five types of surface protective films A1 to A5 having surface roughness Ra of 0.2, 0.3, 0.6, 4.0, and 4.5 were produced by changing the conditions during embossing.

(Production Example 2)
48 parts by mass of the same random polypropylene copolymer as in Production Example 1, 32 parts by mass of homopolypropylene (manufactured by Nippon Polypro Co., Ltd., melt flow rate (230 ° C., 21.2 N) 0.3 g / 10 min), and production Five types of surface protective films B1 to B5 were produced in the same manner as in Production Example 1 except that the resin composition containing 20 parts by mass of HSBR as in Example 1 was used.

(Test Example 1: Anti-slip property)
About each surface protection film obtained by manufacture example 1 and 2, the anti-slipping property (CSR value) at the time of dry-hardening shoes (men's shoes) according to JIS A 5705 was measured. The obtained C.I. S. Based on the R value, the following criteria were evaluated. The results are shown in Table 1 below.
X: Less than 0.42 Sliding is too good and unsuitable.
○: 0.42 or more and less than 0.95 Suitable ×: 0.95 or more

(Test Example 2: Abrasion resistance)
About each surface protection film obtained by manufacture example 1 and 2, the thickness which abraded after 500 rotations was measured using the taper abrasion tester (wear wheel H22, the mass of one arm: 1 kg) according to JISA1453. Based on the measurement results, evaluation was made according to the following criteria. The results are shown in Table 1 below.
○: Less than 0.03 mm Good durability.
(Triangle | delta): 0.03 mm or more and less than 0.05 mm The level which is satisfactory as durability.
X: 0.05 mm or more There is a problem as durability.

(Test Example 3: Antifouling property)
After applying a solvent-type acrylic pressure-sensitive adhesive (product name: BPS1109, manufactured by Toyo Ink Co., Ltd.) as an adhesive on one surface of the surface protective film obtained in Production Examples 1 and 2, the adhesive layer was dried to form an adhesive layer. Formed. The thickness of the adhesive layer after drying was 20 μm.
The surface protective film was stuck to a place with many people through the sticking layer.
Separately, instead of the surface protection film, a general PVC flooring (vinyl chloride flooring, manufactured by Ron Seal Industry Co., Ltd., product name: Ronlium, thickness: 2 mm) is passed through the same adhesive layer to the surface protection film. Attached side by side in the same place. The degree of contamination of both was visually observed and evaluated according to the following criteria. The results are shown in Table 1 below.
○: The surface protective film is less likely to be stained than general PVC flooring.
Δ: Surface protective film and general PVC flooring are equivalent.
X: The surface protective film is more easily stained than general PVC flooring.

(Test Example 4: Transparency)
An adhesive layer was formed on one surface of the surface protective film obtained in Production Examples 1 and 2 in the same manner as in Test Example 3. The surface protective film was stuck on the printing surface of the printed matter through the sticking layer. Using the same printed matter as a comparative control except that the surface protective film was not adhered, the clearness of the printed surface was visually compared and evaluated according to the following criteria. The results are shown in Table 1 below.
○: The clearness of the printed matter is not impaired.
(Triangle | delta): Although the clearness of printed matter is impaired, it is not a level which becomes a problem.
X: The sharpness of the printed matter is impaired.

(Test Example 5: Whitening property)
In the same manner as in Test Example 4, the laminate obtained by attaching the surface protective film on the printed surface of the printed matter via the adhesive layer was visually observed for whitening and evaluated according to the following criteria. did. The results are shown in Table 1 below.
○: There is no whitening state and the clearness of the printed matter is not impaired.
Δ: There is whitening, but it is not a level that impairs the clarity of the printed matter.
X: Whitening is severe and the sharpness of the printed matter is impaired.

  From the results in Table 1, the surface protective films of A2 to 4 and B2 to 4 were all excellent in anti-slip property, abrasion resistance, and antifouling property, and were also excellent in transparency and whitening property.

It is sectional drawing which shows embodiment of the sticking surface protection film of this invention. It is sectional drawing which shows embodiment of the lamination sheet of this invention.

Explanation of symbols

1: Surface protective film 2: Adhesive layer 3: Printing sheet 4: Adhesive layer 10: Adhesive surface protective film 11: First release sheet 12: Second release sheet 20: Laminated sheet

Claims (5)

  A film made of a mixed resin of a polypropylene resin and a thermoplastic elastomer resin, wherein the mass ratio of the polypropylene resin to the thermoplastic elastomer resin is 60:40 to 80:20, and the surface roughness of the film surface Ra is 0.3-4.0 micrometers, The surface protection film characterized by the above-mentioned.   The polypropylene resin is a random polypropylene copolymer, or a mixture of a random polypropylene copolymer and a homopolypropylene resin, and a mass ratio of the random polypropylene copolymer: homopolypropylene resin is from 100: 0 to 60: The surface protective film according to claim 1, wherein the thermoplastic elastomer resin is a hydrogenated styrene copolymer.   The surface protective film according to claim 1, wherein the thickness is 60 to 200 μm.   The sticking surface protection film characterized by the 1st peeling sheet being laminated | stacked on the back surface of the surface protection film as described in any one of Claims 1-3 via the sticking layer. An adhesive layer, a printed sheet, an adhesive layer, and a second release sheet are laminated in this order on the back surface of the surface protective film according to any one of claims 1 to 3. Laminated sheet.

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