JP2009234012A - Marking film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a marking film which is superior in curved surface followability in a relatively low temperature environment and can suppress bubble entrainment between it and an adherend during sticking. <P>SOLUTION: The marking film 1, which is stuck on the adherend to be used, has a substrate 11 and a pressure sensitive adhesive layer 12 formed on the substrate 11. The substrate 11 has a Young's modulus at 5°C of 600-1,300 MPa and a storage modulus at 5°C of 900-2,000 Pa. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a marking film, in particular, a marking film for two wheels or four wheels.

  Conventionally, a decorative film (marking film) is stuck on the body of a motorbike, a motorcycle, an automobile or the like to improve the design of the exterior. As such a film, for example, a decorative film described in Patent Document 1 is known.

  The decorative film described in Patent Document 1 has a decorative material layer covered with a protective layer, a transparent base material supporting the decorative material layer, and an adhesive layer disposed on the lower surface of the transparent base material. It is configured to be attached to an adherend through an adhesive layer.

  In addition, this decorative film has a pulling speed of 200 mm in accordance with the standard defined in JIS-K7127 in order to have excellent followability to a three-dimensional curved surface of a two-wheel fuel tank, fender, etc. (adhered body). It has a 20% modulus stress of 1 to 20 MPa when measured at / min.

  In general, a normal marking film becomes harder at low temperatures, and the followability to a three-dimensional curved surface is poor. In the decorative film described in Patent Document 1, since it has sufficient flexibility even at low temperatures, it has excellent followability to a three-dimensional curved surface. However, because there is almost no stiffness in the decorative film, for example, when a part of the decorative film sticks to other parts at the time of sticking, or bubbles (air) are taken in between the decorative film and the adherend Therefore, a high level of skill was required for the attachment.

JP 2003-191369 A

  An object of the present invention is to provide a marking film capable of suppressing air bubbles from being taken into an adherend at the time of sticking while having excellent curved surface followability in an environment where the temperature is relatively low. There is to do.

Such an object is achieved by the present inventions (1) to (9) below.
(1) A marking film used by being attached to an adherend,
A substrate;
Having an adhesive layer provided on the substrate,
The said base material satisfies the range whose Young's modulus in 5 degreeC is 600-1300 Mpa, and the storage elastic modulus in 5 degreeC satisfies the range of 900-2000 Pa, The marking film characterized by the above-mentioned.

  (2) The said base material is a marking film as described in said (1) comprised by making a vinyl chloride resin into a main material.

  (3) The marking film according to (1) or (2), wherein the base material has a thickness of 10 to 300 μm.

  (4) The base material has a Young's modulus at 23 ° C. in a range of 150 to 750 MPa, and a storage elastic modulus at 23 ° C. in a range of 300 to 1200 Pa. The marking film according to any one of (3).

  (5) The pressure-sensitive adhesive layer is any one of the above (1) to (4), wherein the pressure-sensitive adhesive force immediately after adhering to the adherend satisfies the range of 2 to 12 N / 25 mm at 5 ° C. The marking film described.

  (6) The pressure-sensitive adhesive layer has the above-mentioned (1) to (5) in which the adhesive strength after 24 hours has elapsed from 5 to 25 N / 25 mm at 5 ° C. after being attached to the adherend. The marking film according to any one of the above.

  (7) The said adhesive layer is a marking film in any one of said (1) thru | or (6) whose ball tack according to JIS-Z0237 in 5 degreeC satisfies 3 or less.

  (8) The said adhesive layer is a marking film in any one of said (1) thru | or (7) whose glass transition temperature satisfies the range of -60--40 degreeC.

  (9) The marking film according to any one of (1) to (8), which is used at a low temperature.

  According to the present invention, in a relatively low temperature environment, the curved surface followability is excellent, and it is possible to suppress air bubbles (air) from being taken in between the adherend and the air bubbles. When has been taken in, or when the sticking position has shifted, it can be easily put back and excellent in workability and decorativeness.

A preferred embodiment of the marking film of the present invention will be described in detail below.
FIG. 1 is a view showing a preferred embodiment of the marking film of the present invention.

  As shown in FIG. 1, the marking film 1 includes a sheet-like base material 11, a pressure-sensitive adhesive layer 12 provided on the base material 11, and a release sheet 13 provided on the pressure-sensitive adhesive layer 12. ing. A print layer 14 is formed on the upper surface of the substrate 11. The printing layer 14 is formed by screen printing or the like, for example, and forms decorations such as characters, figures, and patterns on the substrate 11.

  The marking film 1 is configured to peel the release sheet 13 from the pressure-sensitive adhesive layer 12 and stick the pressure-sensitive adhesive layer 12 to an adherend when in use. In addition, about the shape of a marking film 1, and a dimension, it does not specifically limit, It can determine according to the site | part, range, etc. to stick.

  Although it does not specifically limit as a to-be-adhered body, For example, what has a three-dimensional curved surface, such as a vehicle body, is preferable. The “vehicle” includes, for example, a motorcycle, a scooter, a motorbike, any two-wheeled vehicle, a four-wheeled vehicle such as a passenger car, a bus, and a truck, and a train.

  As will be described later, the marking film 1 satisfies the Young's modulus at 5 ° C. in the range of 600 to 1300 MPa and the storage elastic modulus at 5 ° C. in the range of 900 to 2000 Pa. Therefore, in a relatively low temperature environment (hereinafter, also simply referred to as “low temperature environment”), bubbles (air) are taken in between the adherend and the adherence at the time of sticking while having excellent curved surface followability. This can be suppressed.

  The adherend preferably has a three-dimensional curved surface having a relatively large curvature, such as a fuel tank or fender of a motorcycle, and thereby the characteristics of the marking film of the present invention can be further exhibited.

  In addition, the marking film of the present invention exhibits the above-described effects particularly when used in a low temperature environment. In the present specification, “under a low temperature environment” refers to an environment where the temperature is about −10 to 10 ° C. Examples of such regions in a low-temperature environment include Northern Europe such as Norway and Finland, Russia, Canada, Japan (time in winter), and the like.

Hereinafter, each component will be sequentially described.
1. Base Material The base material 11 has a function of supporting the pressure-sensitive adhesive layer 12 and the print layer 14. Such a base material 11 has flexibility (softness | flexibility), and has the curved surface followability at the time of sticking.

  In particular, the present invention is characterized in that the Young's modulus at 5 ° C. of the substrate satisfies the range of 600 to 1300 MPa and the storage elastic modulus at 5 ° C. satisfies the range of 900 to 2000 Pa. . By satisfying such a range, the present invention exhibits excellent curved surface followability in a low-temperature environment, has sufficient stiffness, and air bubbles are taken in between the adherend when stuck. Can be suppressed.

  Thus, the present invention is characterized in that the Young's modulus at 5 ° C. of the substrate satisfies the range of 600 to 1300 MPa and the storage elastic modulus at 5 ° C. satisfies the range of 900 to 2000 Pa. However, it is more preferable that the Young's modulus at 5 ° C. satisfies the relationship of 650 to 1200 MPa, and it is further preferable that the relationship of 750 to 1100 MPa is satisfied. Moreover, it is more preferable that the storage elastic modulus at 5 ° C. of the base material satisfies the range of 1100 to 1800 Pa, and further preferably satisfies the range of 1300 to 1700 Pa. Thereby, the above-mentioned effect becomes more remarkable.

  On the other hand, if the Young's modulus at 5 ° C. and the storage elastic modulus at 5 ° C. of the base material are less than the lower limit values, the base material cannot have sufficient stiffness under a low temperature environment. When affixing, a part of the marking film sticks to another part, or air bubbles are taken in between the marking film and the adherend, and workability deteriorates. In particular, when air bubbles are taken in between the marking film and the adherend, the base does not have sufficient stiffness, so the part where the air bubbles are taken in locally protrudes and the part becomes noticeable. Decorative properties are reduced (looks worse).

  On the other hand, when the Young's modulus at 5 ° C. and the storage elastic modulus at 5 ° C. of the base material exceed the above upper limit values, the base material becomes harder than necessary (that is, hardly deforms), and exhibits curved surface followability. I can't do that. As a result, wrinkles and gaps occur, or after sticking, the adhesive shape of the adhesive layer cannot maintain the deformed shape of the substrate, and the edge of the marking film peels off from the adherend. .

  Moreover, it is preferable that the base material 11 satisfies the range whose Young's modulus in 23 degreeC is 150-750 MPa, and the storage elastic modulus in 23 degreeC satisfies the range of 300-1200 Pa. Further, it is more preferable that the base material 11 satisfies the range of Young's modulus at 23 ° C. of 300 to 600 MPa and the storage elastic modulus at 23 ° C. of 500 to 1000 Pa. By satisfying such a range, the printing process for printing characters and patterns (decorations) on the substrate becomes easy, and the marking film can be easily manufactured and the cost can be reduced.

  Moreover, as thickness of the base material 11, although it does not specifically limit, it is preferable that it is 10-300 micrometers, and it is more preferable that it is 30-150 micrometers. Thereby, the strength of the substrate 11 can be sufficiently ensured while making the stiffness of the substrate 11 suitable. Further, the end of the marking film 1 (that is, the boundary between the adherend and the marking film 1) can be made inconspicuous.

  Such a substrate 11 is not particularly limited as long as the above-described conditions are satisfied, and examples thereof include vinyl chloride resin, vinyl acetate resin, vinyl chloride vinyl acetate copolymer resin, urethane resin, polyethylene, and polypropylene. Examples thereof include a resin film made of a resin material such as olefin resin and polyester. Among these, the base material 11 is preferably a resin film composed mainly of a vinyl chloride resin, from the viewpoint of being inexpensive and relatively easy to process, and exhibiting excellent weather resistance. .

  The vinyl chloride resin preferably used in the present invention refers to a polymer obtained by polymerizing vinyl chloride as an essential component, and even a homopolymer thereof may be a copolymer with a monomer copolymerizable therewith. May be.

  The base material may be polyvinyl chloride alone, but if necessary, polyurethane resin, (meth) acrylic resin, etc. are added to polyvinyl chloride in order to adapt the characteristics of the base material to the present invention. May be used as a substrate.

  In the case of using a polymer obtained by polymerizing vinyl chloride as an essential component as the polyvinyl chloride base material, plasticized polyvinyl chloride is preferable in terms of excellent flexibility, weather resistance, and economy. As the plasticizer used when plasticizing polyvinyl chloride, any known and conventional plasticizers can be used. And epoxy plasticizers such as epoxidized soybean oil and epoxidized polybutadiene.

  In addition, when manufacturing the base material, known and commonly used additives such as metal soaps, pigments, fillers, flame retardants, fragrances, lubricants, surfactants, water repellents, oil repellents are used in combination. May be.

  The method for producing the substrate itself is not particularly limited, and for example, any of a calendar molding method, a melt extrusion molding method, and a casting molding method can be employed. The substrate used in the present invention may be a single layer or a multilayer with different polyvinyl chlorides.

  In order to have the characteristics as in the present invention, a substrate having desired characteristics can be prepared by adjusting the molecular weight or degree of polymerization of polyvinyl chloride or adjusting the amount of plasticizer added.

2. Pressure-sensitive adhesive layer The pressure-sensitive adhesive layer 12 is composed mainly of a pressure-sensitive adhesive.

  In the pressure-sensitive adhesive layer 12, the adhesive force immediately after sticking preferably satisfies a range of 2 to 12 N / 25 mm at 5 ° C., and more preferably satisfies a range of 3 to 10 N / 25 mm. Thereby, for example, when the sticking position of the marking film 1 is deviated from the desired position, or when air bubbles are taken in between the marking film 1 and the adherend, relatively easily, The marking film 1 can be peeled off from the adherend, and the marking film 1 can be reattached. That is, it is possible to re-paste and stick to the adherend with sufficient adhesive force. As a result, workability is improved.

  On the other hand, if the adhesive strength is less than the above lower limit, it may differ depending on the application of the marking film 1 (the type of adherend), but sufficient adhesive strength may not be obtained for the adherend. is there. On the other hand, when the adhesive strength exceeds the above upper limit, the marking film 1 cannot be peeled off from the adherend immediately after sticking, for example, the sticking position of the marking film 1, depending on the type of adherend. May be displaced with respect to the desired position, or when bubbles are taken in between the marking film 1 and the adherend, the marking film 1 may not be reattached. Even if the marking film 1 can be peeled off, the marking film 1 may be curled or damaged by the force applied to the marking film 1 at the time of peeling.

  Moreover, it is preferable that the adhesive force at the time of 24 hours after sticking satisfies the range of 5-25N / 25mm in 5 degreeC, and it is more preferable that the adhesive layer 12 satisfies the range of 8-20N / 25mm. preferable. Thereby, after the predetermined time has elapsed, since the marking film 1 can be adhered to the adherend with sufficient adhesive force, the marking film 1 is naturally attached to the adherend (with no external stress applied). ) It can effectively prevent peeling.

  On the other hand, if the adhesive strength is less than the above lower limit value, depending on the type of adherend, the sufficient sticking force cannot be exhibited, and the marking film 1 is naturally peeled off from the adherend. May end up. On the other hand, when the adhesive strength exceeds the above upper limit, the adhesive strength is too strong, and depending on the type of adherend, for example, when the marking film 1 is peeled off from the adherend due to damage of the marking film 1 or the like. It becomes difficult to peel off the marking film 1. That is, when peeling off the marking film 1, a relatively large force is required, and workability may be deteriorated.

  The pressure-sensitive adhesive layer 12 has a ball tack at 5 ° C. according to JIS-Z0237 of preferably 3 or less, and more preferably 2 or less. Thereby, for example, the sticking position of the marking film 1 is shifted with respect to a desired position, or bubbles are taken in between the marking film 1 and the adherend while having sufficient adhesive force. In this case, the marking film 1 can be peeled off from the adherend relatively easily, and the marking film 1 can be reattached. That is, it is possible to re-paste and stick to the adherend with sufficient adhesive force. As a result, workability is improved.

  On the other hand, if the ball tack exceeds the above upper limit, depending on the type of adherend, it becomes difficult to peel the marking film 1 from the adherend (that is, a relatively strong force is required). When the attachment position of the marking film 1 is deviated from the desired position, or when air bubbles are taken in between the marking film 1 and the adherend, the attachment of the marking film 1 is performed again. May not be possible. Even if the marking film 1 can be peeled off, the marking film 1 may be curled or damaged by the force applied to the marking film 1 at the time of peeling.

  The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 preferably has a glass transition temperature in the range of −60 to −40 ° C., more preferably in the range of −55 to −45 ° C. Thereby, the adhesive force of the adhesive layer 12 can be made into a desired thing. On the other hand, if the glass transition temperature is less than the lower limit, depending on the environmental temperature or the like, the adhesive or the like may ooze out from the adhesive layer 12 and the adhesive strength may be reduced. In addition, such adhesive sticking out may cause adhesive residue when the marking film 1 is peeled off. On the other hand, when the glass transition temperature exceeds the upper limit, depending on the environmental temperature, the pressure-sensitive adhesive layer 12 may not exhibit sufficient elasticity, and the curved surface followability of the marking film 1 may be hindered.

  Examples of the pressure-sensitive adhesive include a rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, and a urethane-based pressure-sensitive adhesive. For example, when the pressure-sensitive adhesive is an acrylic pressure-sensitive adhesive, the pressure-sensitive adhesive composition includes a main monomer component that provides adhesiveness, a comonomer component that provides adhesiveness and cohesion, and a functional group-containing monomer for improving crosslinking points and adhesiveness. It can be composed of a polymer or copolymer mainly composed of components.

  As the main monomer component, for example, acrylic acid alkyl esters such as ethyl acrylate, butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate, benzyl acrylate, methoxyethyl acrylate, Examples include methacrylic acid alkyl esters such as butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, and benzyl methacrylate.

  Examples of the comonomer component include methyl acrylate, methyl methacrylate, ethyl methacrylate, vinyl acetate, styrene, acrylonitrile, and the like.

  Examples of the functional group-containing monomer component include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, maleic acid, and itaconic acid, 2-hydroxyethyl acrylate, hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, and methacrylic acid. Examples thereof include hydroxyl group-containing monomers such as 2-hydroxypropyl and N-methylolacrylamide, acrylamide, methacrylamide, glycidyl methacrylate and the like.

  By including these components, the adhesive force and cohesive force of the pressure-sensitive adhesive composition are improved. In addition, since such an acrylic resin usually does not have an unsaturated bond in the molecule, stability to light and oxygen can be improved. Furthermore, a pressure-sensitive adhesive composition having quality and characteristics according to the application can be obtained by appropriately selecting the type and molecular weight of the monomer.

  As such a pressure-sensitive adhesive composition, any of a crosslinked type that undergoes crosslinking treatment and a non-crosslinked type that does not undergo crosslinking treatment may be used, but a crosslinked type is more preferred. When a cross-linked type is used, a pressure-sensitive adhesive layer with better cohesion can be formed.

  Examples of the crosslinking agent used in the crosslinking adhesive composition include an epoxy compound, an isocyanate compound, a metal chelate compound, a metal alkoxide, a metal salt, an amine compound, a hydrazine compound, and an aldehyde compound.

  Moreover, in the adhesive composition used for this invention, various additives, such as a plasticizer, a tackifier, and a stabilizer, may be contained as needed.

  Although the thickness of an adhesive layer is not specifically limited, It is preferable that it is 5-100 micrometers, and it is more preferable that it is 10-60 micrometers.

3. Release Sheet The release sheet 13 is a sheet for protecting the pressure-sensitive adhesive layer 12 and preventing dust from adhering to the pressure-sensitive adhesive layer 12.

  The release sheet 13 can be produced by preparing a release substrate and forming a release agent layer by coating the release agent on the release substrate.

  As release sheet 13, what is necessary is just to apply release agents, such as silicone resin, to at least one side of release substrates, such as paper and a resin film, and a well-known thing can be used. Further, such a release sheet 13 may be omitted.

  As mentioned above, although preferred embodiment of the marking film of this invention was described, this invention is not limited to these.

  Moreover, in embodiment mentioned above, although the base material was demonstrated about what was comprised by the single layer, it is not limited to this, You may be comprised by the several layer.

  Moreover, you may form the protective layer which protects the decoration given by printing etc. in the surface on the opposite side to the adhesive bond layer of a base material. At this time, for example, the protective layer can be formed by applying urethane-based clear coating from above the printing layer and drying it.

Next, specific examples of the marking film of the present invention will be described.
1. Production of marking film An adhesive layer was formed on one side of the substrate to produce a marking film.

Example 1
(1-1) Preparation of base material 100 parts by weight of polyvinyl chloride resin (PVC) having an average degree of polymerization of 800, 35 parts by weight of a polyester plasticizer (Asahi Denka Co., Ltd., “Sizer PN-230”), barium-zinc system A composition comprising 3 parts by weight of a heat stabilizer (Ba—Zn), 0.2 parts by weight of a cyanoacrylate stabilizer, and 30 parts by weight of titanium dioxide white pigment powder (TiO ₂ ) was kneaded and then formed into a film by a calender film forming machine. A base material having a thickness of 50 μm was obtained.

(1-2) Preparation of acrylic copolymer solution In a reactor equipped with a thermometer, a stirrer, a reflux condenser, and a nitrogen gas introduction tube, 50 parts by weight of butyl acrylate (BA), 2-ethylhexyl acrylate ( 2EHA) 50 parts by weight, acrylic acid (AA) 11.1 parts by weight, ethyl acetate 150 parts by weight as a solvent, 0.3 radicals by weight of azobisisobutyronitrile as a radical polymerization initiator, nitrogen gas Polymerization was performed in an atmosphere at 80 ° C. for 8 hours. The weight average molecular weight of the obtained acrylic copolymer was 550,000.

  After completion of the reaction, toluene was added to prepare an acrylic copolymer solution having a solid content concentration of 32%. To 100 parts by weight of the obtained acrylic copolymer solution, 2.0 parts by weight of an isocyanate crosslinking agent (manufactured by Nippon Polyurethane Co., Ltd., trade name “Coronate L”) was added to prepare an adhesive.

(1-3) Preparation of marking film This pressure-sensitive adhesive was applied to the release surface of a release sheet treated with a silicone resin using a knife coater so that the thickness after drying was 25 μm. The pressure-sensitive adhesive layer was formed by heating and drying for a minute. Subsequently, it bonded so that one side of the said base material and an adhesive layer might contact | connect, and produced the marking film.

(Examples 2 to 11)
A marking film was produced in the same manner as in Example 1 except that the types and contents of the materials used for the substrate and the pressure-sensitive adhesive were changed as shown in Table 1. In Table 1, “MMA” means methyl methacrylate, and “2HEA” means 2-hydroxyethyl acrylate.

(Comparative Examples 1-6)
A marking film was produced in the same manner as in Example 1 except that the types and contents of the materials used for the substrate and the pressure-sensitive adhesive were changed as shown in Table 1.

2. Various measurements About the marking films of Examples 1 to 11 and Comparative Examples 1 to 6 obtained as described above, Young's modulus, storage elastic modulus, ball tack, and adhesive strength were measured by the following methods. The results are shown in Table 2.

≪Young's modulus≫
The Young's modulus was measured according to JIS-K7127. In addition, about the Young's modulus, the Young's modulus in 5 degreeC and the Young's modulus in 23 degreeC were measured.

≪Storage modulus≫
In accordance with JIS-K7244-1 and 7244-4, using “Leo Vibron” manufactured by Orientec Co., Ltd., a substrate having a width of 10 mm and a thickness of 50 μm is 40 mm in distance between clamps, a start temperature of −50 ° C., and an end temperature of 180 ° C. The measurement was performed at a temperature rate of 5 ° C./min and a measurement frequency of 11 Hz.

≪Adhesive strength≫
The adhesive strength was measured in accordance with JIS-Z0237 under 5 ° C environment. In addition, about adhesive force, the adhesive force 30 seconds after sticking and the adhesive force 24 hours after sticking were measured.

≪Ball tack≫
The ball tack was measured according to JIS-Z0237 in a 5 ° C. environment. The inclination angle was 30 degrees.

3. Evaluation The following tests were performed on the marking films obtained in Examples 1 to 11 and Comparative Examples 1 to 6. All tests were performed in a room at a room temperature of 5 ° C. and a humidity of 50%.

(2-1) Curved surface follow-up test Twenty subjects were asked to attach a 100 mm × 100 mm marking film to an adherend, and evaluation was made based on whether or not wrinkles were generated on the marking film. As the adherend, an aluminum sphere having a mirror surface and a curvature radius of 150 mm was used.

◎ ………… Marking film with wrinkles is less than 5% ○ …… Marking film with wrinkles is more than 5% and less than 10% △ …… Marking film with wrinkles is 10% of the whole Less than 30% × 30% or more of marking film with wrinkles

(2-2) Bubble Intake Test 20 subjects have a 100 mm × 100 mm marking film attached to an adherend (150 mm × 150 mm melamine-baked iron plate), and between the marking film and the adherend The number of bubbles taken in was evaluated.

◎ ...... The number of bubbles is less than 1 on average for the marking film. ○ ...... The number of bubbles is on average from 1 to less than 3. The number of bubbles is the average for one marking film. 3 or less and less than 5 × × · · · The number of bubbles is 5 or more on average on one marking film

(2-3) Sensitivity test regarding ease of application of marking film 20 subjects were asked to attach a 100 mm x 100 mm marking film to an adherend (150 mm x 150 mm melamine-baked coated iron plate), and the ease of application Was measured by the VAS method. With the VAS method, you can mark a line segment of any length as you feel about usability (ease of sticking), and measure the length from one end of the line segment to the mark. This is a method for objectively evaluating the feeling of use.

  In this test, the length from the left end to the mark was measured in units of 1 mm using the ones described as “difficult to stick” at the left end of the 50 mm line segment extending in the horizontal direction and “easy to stick” at the right end. The obtained length was used as a score (for example, when the length from the left end to the mark was 4.2 cm, the score was 4.2). Therefore, a marking film with a higher score is easier to stick.

(2-4) Sensitivity test regarding ease of peeling of marking film Twenty subjects were asked to peel off a 100 mm x 100 mm marking film affixed to an adherend (150 mm x 150 mm melamine baked iron plate) The ease of peeling was measured by the VAS method. In this test, the length from the left end to the mark was measured in units of 1 mm using the ones described as “difficult to peel” and “easy to peel” at the left end of a 50 mm line segment extending in the horizontal direction. The measured length was used as the score. In addition, this test was done about the marking film 30 seconds after sticking.

(2-5) Sensitivity test on adhesive residue 20 subjects were allowed to touch the adherend immediately after peeling off the marking film by hand, and the adhesive residue feeling (stickiness) of the adherend was measured by the VAS method. In this test, the length from the left end to the mark was measured in units of 1 mm using the ones with “Stickiness” at the left end of the 50 mm line extending in the horizontal direction and “No stickiness” at the right end. The measured length was used as the score.

  Table 3 shows the test results of the tests (2-1) to (2-5). In addition, about each test of (2-3)-(2-5), the average value of the score of 20 test subjects was shown.

  As is apparent from Table 3, the marking film of the comparative example has a very high probability that wrinkles and bubbles are generated, the marking film is too hard (too soft), and is difficult to stick, or the adherend after peeling is sticky. In each example, the generation of wrinkles and bubbles was sufficiently suppressed, and the results were that it was easy to stick and peel off. Moreover, the adhesive residue after peeling off the marking film was sufficiently suppressed.

It is sectional drawing which shows suitable embodiment of the moisture retention sheet | seat of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Marking film 11 Base material 12 Adhesive layer 13 Release sheet 14 Print layer

Claims (9)

A marking film used by being attached to an adherend,
A substrate;
Having an adhesive layer provided on the substrate,
The said base material satisfies the range whose Young's modulus in 5 degreeC is 600-1300 MPa, and the storage elastic modulus in 5 degreeC satisfies the range of 900-2000 Pa, The marking film characterized by the above-mentioned.   The marking film according to claim 1, wherein the base material is composed of a vinyl chloride resin as a main material.   The marking film according to claim 1 or 2, wherein the substrate has a thickness of 10 to 300 µm.   4. The substrate according to claim 1, wherein Young's modulus at 23 ° C. satisfies a range of 150 to 750 MPa, and storage elastic modulus at 23 ° C. satisfies a range of 300 to 1200 Pa. Marking film as described in.   The marking film according to any one of claims 1 to 4, wherein the pressure-sensitive adhesive layer has an adhesive force immediately after being attached to the adherend within a range of 2 to 12 N / 25 mm at 5 ° C.   6. The pressure-sensitive adhesive layer according to any one of claims 1 to 5, wherein the pressure-sensitive adhesive strength after 24 hours from sticking to the adherend satisfies a range of 5 to 25 N / 25 mm at 5 ° C. Marking film.   The marking film according to claim 1, wherein the pressure-sensitive adhesive layer has a ball tack according to JIS-Z0237 at 5 ° C. of 3 or less.   The marking film according to any one of claims 1 to 7, wherein the pressure-sensitive adhesive layer satisfies a glass transition temperature in a range of -60 to -40 ° C.   The marking film according to any one of claims 1 to 8, which is used at a low temperature.

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