JP2012111905A - Protective film for exterior - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective film for an exterior capable of improving mounting work efficiency remarkably without damaging a prevention effect of condensation by a porous film, and solving a problem of an adhesive residue, when protecting the exterior such as a coated surface by using the porous film.SOLUTION: This protective film for an exterior is constituted of a pressure sensitive adhesive having a pressure sensitive adhesive layer 2 formed partially in the dotted or linear state on the surface on one side of a porous film 1 having air permeability and water impermeability, wherein the outermost surface of the pressure sensitive adhesive layer 2 has such low adhesiveness that the adhesive strength to a stainless steel measured in a condition of 23°C×50% RH to be measured based on JIS Z 0237 is in the range of ≥0.05N/25 mm and <5.0N/25 mm. Further, in an embodiment in which the protective film for an exterior is used in a belt state, the film is preferably supplied as a product in the state of being wound in a rolled shape with the pressure sensitive adhesive layer inside.

Description

  The present invention relates to a novel exterior protective film using a porous film. Specifically, it is a film for protecting an exterior such as a painted surface of an automobile, the internal condensation on the protected exterior surface, which is the original characteristic of the porous film, is prevented, and the work for attaching to the protected exterior surface It is intended to provide an exterior protective film capable of remarkably improving the properties.

  In order to protect the exterior of the product, an exterior protective film is adhered to the surface of the product. For example, in the automobile field, an exterior protective film is attached to a painted surface in order to protect the coating from dust, acid rain, and bird droppings during transportation or storage of the finished vehicle. .

  Conventionally, the exterior protective film is generally made of a film of a material typified by a polyolefin-based resin, and an adhesive layer is formed on the entire surface of one side (see Patent Document 1). Construction of the protective film for exterior is performed by sticking to the protected exterior surface through the pressure-sensitive adhesive layer. However, in the above work, if air bubbles exist between the protected exterior surface and the film, moisture in the air bubbles is condensed due to temperature change, and the paint on the protected exterior surface is discolored due to the condensed water. Occurs.

  Accordingly, the conventional exterior protective film having the pressure-sensitive adhesive layer on the entire surface needs to be carefully attached with a squeegee so as not to be involved, and in Patent Document 1, such bubbles are involved in the work with the squeegee. A configuration of a pressure-sensitive adhesive layer that hardly occurs has been proposed.

  On the other hand, if a porous film having air permeability is used with respect to the exterior protective film having the pressure-sensitive adhesive layer on the entire surface, a breathable porous film is used between the film and the protected exterior surface. It was confirmed that the phenomenon of condensation does not occur even in the presence of air. Therefore, as a method of protecting the painted surface using the porous film, in order to make use of the characteristics of the porous film, the porous film surface is not provided with the pressure-sensitive adhesive layer and covers the protected exterior surface. A method of fixing only the outer peripheral portion or the joint portion of the film using an adhesive tape or the like is conceivable.

  However, in the work of attaching the porous film, there is a concern about poor workability. For example, the porous film is slippery with respect to the painted surface of the vehicle body, and the operation of attaching the porous film to the vehicle body is carried out together with the manual operation for fixing the outer peripheral portion or the seam portion of the porous film. There is a problem that manpower is required for fixing so as not to slip.

  On the other hand, in the conventional exterior protective film, it is conceivable to partially provide the pressure-sensitive adhesive layer provided on the entire surface so as not to impair the properties of the porous film, which is equivalent to the conventional exterior protective film. Can be handled.

  However, in the above method, when the film after use is peeled off, the pressure-sensitive adhesive has a high adhesive strength, so that the pressure-sensitive adhesive layer partially provided on the porous film remains on the exterior surface, so-called “glue remaining” Is likely to occur.

JP 2001-31923 A

  Accordingly, an object of the present invention is to provide a protective film for an exterior that uses a porous film and has improved workability to be attached to a protected exterior surface. To provide a protective film for exteriors that can remarkably improve the mounting workability without impairing the effect of preventing dew condensation due to the porous film when protecting the exterior such as It is in.

  As a result of intensive studies to achieve the above-mentioned object, the present inventors partially applied a pressure-sensitive adhesive having a low adhesive strength to a porous film having air permeability and water impermeability in a dotted or linear manner. By providing the porous film, the air permeability of the porous film can be ensured and the occurrence of condensation can be prevented, and the adhesive force can prevent slipping on the protected exterior surface, thereby holding the porous film. It has been found that glue can be effectively prevented from being left on the protected exterior surface when removing the protective film for the exterior, and can be efficiently attached without requiring manual labor, thereby completing the present invention. It was.

  That is, the present invention is a pressure-sensitive adhesive partially formed in a dotted or linear manner on one side of a porous film having air permeability and water impermeability (hereinafter also referred to as “porous film”). 4. Adhesive strength to stainless steel measured at 23 ° C. × 50% RH measured according to JIS Z 0237 is 0.05 N / 25 mm or more. It is the protective film for exteriors comprised by the adhesive in the range below 0 N / 25mm.

  The pressure-sensitive adhesive layer is composed of at least two layers, and the adhesive force of the pressure-sensitive adhesive existing on the porous film side may be set to be 200% or more higher than the pressure-sensitive adhesive force existing on the outermost surface of the pressure-sensitive adhesive layer. It is preferable for fixing the pressure-sensitive adhesive layer to the porous film more reliably.

  Moreover, it is preferable in order to ensure the air permeability of a porous film that the area which the said adhesive layer occupies is a ratio of 1 to 50% with respect to the area of a porous film.

  Furthermore, it is advantageous in continuous production that the porous film is long and the pressure-sensitive adhesive layer extends linearly in the longitudinal direction of the porous film.

  Further, the present invention provides the above-described exterior protective film placed on the exterior surface to be protected and temporarily fixed by the adhesive force of the pressure-sensitive adhesive layer, and then surrounding the exterior protective film outside the surface to be protected. The construction method of the protective film for exteriors characterized by fixing is also provided.

  In addition, in this application, a "film" does not have a strict meaning in thickness but includes a sheet | seat.

  The protective film for exterior of the present invention has a pressure-sensitive adhesive layer having a weak adhesive force partially formed in a dotted or linear form on the surface thereof, so that it is on a protected exterior surface such as a painted surface of an automobile. In addition, the temporary fixing can be stably performed, the protective film does not slide down or move on the protected exterior surface, and the position after the temporary fixing can be corrected. For this reason, it is possible to significantly improve the mounting workability by fewer workers without requiring a manpower for holding the protective film. Further, in the portion where the pressure-sensitive adhesive layer does not exist, the characteristics of the porous film are utilized, and the problem of dew condensation does not occur on the protected exterior surface.

  Moreover, since the protective film for exterior use of the present invention uses a pressure-sensitive adhesive layer having a weak adhesive force, the problem of adhesive residue can be solved even in the removal work after use, and the work can be efficiently performed. Make it possible. Incidentally, the protective film for exterior use of the present invention having the pressure-sensitive adhesive layer whose adhesive strength is adjusted in the above range is such that the paste adheres to the painted surface even after 6 months or more after being mounted on the painted surface of the automobile. It has been confirmed by the present inventors that there is not.

  Furthermore, since the protective film for exterior of the present invention has a weak adhesive force of the pressure-sensitive adhesive layer, it can be stored as it is without using a release film for protecting the pressure-sensitive adhesive layer. It can be cut into a desired shape and peeled off one by one and used. In addition, if the long product is wound in a roll shape with the pressure-sensitive adhesive layer as the inner side, the required length can be easily pulled out, so that it is convenient and industrially very useful.

  Furthermore, the protective film for exterior use according to the present invention has a weak adhesive force of the pressure-sensitive adhesive layer, and therefore can be easily peeled off and used even if the adhesive layers of the wrong film are combined.

The top view which shows one aspect | mode of the protective film for exterior | packing of this invention The top view which shows the other one aspect | mode of the protective film for exterior | packing of this invention The perspective view which shows the aspect which wound the protective film for exterior | packing of this invention in roll shape The perspective view which shows the aspect which wound the protective film for exterior | packing of this invention in roll shape Sectional drawing which shows the attachment state to the to-be-protected exterior surface of the protective film for exterior of this invention

  As shown in the accompanying drawings, the exterior protective film of the present invention was partially formed in a dotted or linear shape on one side of a porous film 1 having air permeability and water impermeability. It has the adhesive layer 2 with weak adhesive force. FIG. 1 shows a typical mode in which the adhesive layer 2 is formed in a dot shape, and FIG. 2 shows a typical mode in which the adhesive layer 2 is formed in a linear shape.

  In the present invention, as the porous film having air permeability and water permeability, a porous film having such characteristics is used without any particular limitation. Among them, many resinous porous films are commercially available and can be most suitably used in the present invention. Examples of the film that is commercially available as the resin porous film include Porum (trade name) manufactured by Tokuyama Corporation, Sunmap (trade name) manufactured by Nitto Denko Corporation, and the like.

  In the present invention, the porous film having air permeability and water impermeability has an air permeability of Gurley permeability of 3000 sec / 100 cc or less, particularly 50 to 2000 sec / 100 cc, and further 100 to 1000 sec / 100 cc. Those are preferred. Moreover, what has the water-imperviousness whose water pressure resistance according to JIS-L-1092 is 8 kPa or more is suitable. In order to improve weather resistance, it is preferable to contain 1 to 20% by weight, particularly 5 to 15% by weight of titanium oxide in the film.

  Although the following method is mentioned as a typical manufacturing method of the resin-made porous film which has the said air permeability and water permeability, it is not limited to this method, It can also obtain by another well-known method It is.

  As a method for producing the resinous porous film, a resin composition in which paraffin, inorganic powder or the like is dispersed in a thermoplastic resin such as polyolefin is formed into a film, and then the melting point of the thermoplastic resin or less is generally set. Is formed uniaxially or biaxially with an area magnification of 120 to 400% while being heated to 30 to 90 ° C., and then, if necessary, the pores penetrating the film are formed by removing the filler. A method is mentioned.

  In addition, as a method for removing paraffin, inorganic powder and the like after stretching, extraction with a solvent, dissolution with an acid, and the like are performed. Of course, when the film can be given air permeability by the holes generated only by the stretching operation, the removing operation is not particularly necessary.

  Polyolefin is common as the thermoplastic resin, and ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, 5-methyl- Examples thereof include homopolymers or copolymers of α-olefin such as 1-heptene. Among them, from the viewpoint of obtaining a film having high crystallinity and high strength, polypropylene, particularly isotactic polypropylene, and from the viewpoint of obtaining a highly flexible film, polyethylene, particularly low density polyethylene is preferable. is there.

  As the porous film of the present invention, water-repellent paper, non-woven fabric, and the like can be used as long as they have equivalent characteristics in addition to the resin film.

  The exterior protective film of the present invention can be handled in the form of a unit film as shown in FIGS. 1 and 2, and can be handled in a state of being cut or punched into an arbitrary mold. It is preferable to handle with a continuous belt-like porous film. In this case, the width of the band may be appropriately determined according to the application. When used as a protective film for automobile exterior, 300 to 2000 mm is appropriate. Further, the length of the belt-like porous film is not particularly limited, but when used as a continuous belt-like shape, as shown in FIGS. In this case, it is common to wind with the surface on which the pressure-sensitive adhesive layer is present inside, but if necessary, it can also be wound in the reverse direction.

  In the present invention, the thickness of the porous film does not have a strict range as the “film” as described above, but generally has a thickness of 15 to 500 μm, preferably 50 to 200 μm. Is preferred.

  In the exterior protective film of the present invention, the pressure-sensitive adhesive layer 2 has an adhesion of 0.05 N / 25 mm to the stainless steel measured on the outermost surface under the condition of 23 ° C. × 50% RH measured according to JIS Z 0237. As mentioned above, it is comprised with the adhesive in less than 5.0 N / 25mm, Preferably, it is the range of 0.1-1.0N / 25mm.

  That is, in the present invention, the pressure-sensitive adhesive layer 2 does not have an adhesive force to firmly fix the film as used in a conventional exterior protective film, but has a smaller adhesive force. It consists of the adhesive which has. Incidentally, the adhesive generally used in the conventional protective film has an adhesive force of 10 N / 25 mm or more, and the adhesive layer of the present invention is clearly distinguished from the adhesive layer. And in the protective film for exteriors of this invention, when the said adhesive force is 5.0 N / 25mm or more, the adhesive residue in the removal operation | work after use becomes easy to occur, and the objective of this invention cannot be achieved. Moreover, there is a concern that the handleability of the film is lowered due to the adhesive force of the pressure-sensitive adhesive layer.

  On the other hand, when the adhesive strength is lower than 0.05 N / 25 mm, the adhesive strength to the protected exterior surface is insufficient, and it is difficult to stably hold the surface on the protected exterior surface.

  The “adhesive strength”, as understood from the measurement method, regulates the adhesive strength specific to the adhesive. For adhesives with strong adhesive strength, the area of the adhesive layer is limited. The adhesive strength is not reduced by reducing the adhesion area. In such a case, even if the adhesive force is low, problems such as adhesive residue on the protected exterior surface cannot be solved by the adhesive force specific to the adhesive.

  In the present invention, as shown in FIG. 1, when the pressure-sensitive adhesive layer 2 has a dot shape, the size of one point is preferably 2 to 50 mm in diameter, particularly about 5 to 20 mm, and the interval is , 50 mm or more, preferably 50 to 1000 mm with adjacent points. Further, in the aspect in which the adhesive layer 2 is provided in the form of dots, the shape of the dots is generally round, but is not particularly limited, such as a quadrangle, a polygon, or an indefinite shape.

  As shown in FIG. 2, when the pressure-sensitive adhesive layer 2 is linear, the width of the line is preferably 2 to 50 mm, particularly about 5 to 20 mm, and a plurality of lines are present in parallel. The distance between the adjacent lines is 50 mm or more, preferably 50 to 1000 mm.

  Furthermore, when the protective film for exteriors is long, it is preferable that the pressure-sensitive adhesive layer 2 is continuously provided in a linear shape as shown in FIG. The number of the lines may be one or plural, and in order to prevent thickness unevenness when wound on a roll, it is formed by changing the position in a wave shape as shown in FIG. This is also a preferred embodiment.

  Of course, the pressure-sensitive adhesive layer 2 can also be provided with a right angle or a diagonal line with respect to the longitudinal direction in the long exterior protective film.

  In any embodiment, in order to ensure sufficient air permeability of the film, the area occupied by the pressure-sensitive adhesive layer may be determined to be 50% or less, preferably 40% or less of the area of the porous film. preferable. The thickness of the pressure-sensitive adhesive layer 2 is 7 to 70 μm, particularly 10 to 50 μm.

  In the present invention, as the adhesive forming the pressure-sensitive adhesive layer having a low adhesive force, a known adhesive having such an adhesive force is used without any particular limitation. For example, the pressure-sensitive adhesive layer can be formed of a suitable pressure-sensitive adhesive such as rubber or acrylic. When adjusting the adhesive strength of the pressure-sensitive adhesive layer, for example, for controlling the adhesive properties, for example, terpene resins, aliphatic resins, aromatic resins, aromatic copolymers, rosin resins, For example, an appropriate tackifier such as a coumarone indene resin, a phenol resin, or a xylene resin may be blended.

  In the present invention, the pressure-sensitive adhesive layer 2 is composed of at least two layers, and the adhesive force of the pressure-sensitive adhesive layer A existing on the porous film side is determined by the adhesive force of the pressure-sensitive adhesive layer B existing on the outermost surface of the pressure-sensitive adhesive layer. A setting higher than 200% is preferable in order to more reliably fix the pressure-sensitive adhesive layer to the porous film. That is, when the pressure-sensitive adhesive layer is constituted only by the pressure-sensitive adhesive layer B, peeling from the porous film may occur due to the weak adhesive force.

  As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer A, a known pressure-sensitive adhesive used for a conventional exterior protective film can be used without particular limitation. For example, an adhesive mainly composed of polyisobutylene, butyl rubber, or polybutene can be used.

  In the present invention, the method for forming the pressure-sensitive adhesive layer 2 on the surface of the porous film 1 is not particularly limited, but the pressure-sensitive adhesive is used as a solvent because of the necessity of forming a linear pattern on the film surface. There is a method in which a solution or paste dissolved in is applied to the film surface by a printing method or the like, and then the solvent is removed by drying.

  Further, when the pressure-sensitive adhesive layer 2 is formed of two or more layers, each layer is printed in duplicate, or the paste containing the adhesive is coextruded from a two-layer nozzle, and the dots and lines are formed. The method of forming is mentioned.

  FIG. 5: shows sectional drawing of the state which attached the protective film for exterior of this invention to the to-be-protected exterior surface. That is, the protection of the protected exterior surface 3 using the exterior protective film of the present invention is performed by temporarily fixing the exterior protective film on the protected exterior surface 3 of the vehicle body 4 or the like using the adhesive layer 2. In the state, the seam between the films that are joined by overlapping the end portions of the film is fixed with the adhesive tape 5a, and the periphery of the protective film for exterior is fixed with the adhesive tape 5b, c outside the protected exterior surface 3. Can be done. In the above work, conventionally, before fixing the protective film for the exterior, a manpower for holding the film so that it does not slip or move is necessary. Since the film is temporarily fixed by 2, the steps from film alignment to fixing can be performed by a small number of people, or in some cases, by one person.

  The surface protected by the exterior protective film of the present invention takes advantage of the characteristics of the porous film, and the problem of condensation does not occur on the protected exterior surface.

  Moreover, the exterior protective film after use can be easily peeled off from the protected exterior surface, and the adhesive residue in that case is also effectively suppressed. Also, even if the adhesive layer remains on the protected exterior surface, the adhesive force is weak, so it can be easily peeled off, and the conventional wiping operation with a solvent or the like can be omitted. is there.

  The exterior protective film of the present invention can be suitably used as an exterior protective film for automobile exterior protective films, home appliances, aluminum products, and painted wood products.

DESCRIPTION OF SYMBOLS 1 Porous film which has air permeability and non-water permeability 2 Adhesive layer 3 Protected exterior surface 4 Car body 5a Adhesive tape 5b Adhesive tape 5c Adhesive tape

Claims (6)

On one surface of a porous film having air permeability and non-water permeability, a pressure-sensitive adhesive layer partially formed in a dotted or linear shape is provided, and the outermost surface of the pressure-sensitive adhesive layer is JIS Z 0237. The adhesive strength to stainless steel measured under the condition of 23 ° C. × 50% RH measured according to the above is composed of an adhesive having a range of 0.05 N / 25 mm or more and less than 5.0 N / 25 mm. A protective film for exterior. The pressure-sensitive adhesive layer is composed of at least two layers, and the adhesive force of the pressure-sensitive adhesive existing on the porous film side is set to be 200% or more higher than the adhesive force of the pressure-sensitive adhesive existing on the outermost surface of the pressure-sensitive adhesive layer. The protective film for exterior as described. The exterior protective film according to claim 1 or 2, wherein the area occupied by the pressure-sensitive adhesive layer is 1 to 50% of the area of the porous film. The protective film for exterior | packing as described in any one of Claims 1-3 in which the porous film is elongate and the adhesive layer is extended in the linear form continuous in the longitudinal direction of this porous film. The exterior protective film according to claim 1 is placed on the protected exterior surface and temporarily fixed by the adhesive force of the pressure-sensitive adhesive layer, and then the periphery of the exterior protective film is fixed outside the protected exterior surface. The construction method of the protective film for exteriors characterized by the above-mentioned. The construction method according to claim 5, wherein the exterior protective film is cut in accordance with the exterior part.

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