WO2008065720A1 - Surface protective sheet - Google Patents

Abstract

A surface protective film or sheet for vehicle body coating that in the protection of surface of finish coating applied to the surface of body of vehicle with final coating, especially a surface of finish coating to which a paint susceptible to water, such as an emulsion paint, has been applied, even when a crease or the like occurs to thereby invite penetration of rainwater therefrom, effectively avoids any appearance failures, such as swollen paste remains. There is provided a surface protective film or sheet for vehicle body coating, having a base material and, superimposed on at least one major surface thereof, a pressure sensitive adhesive, characterized in that the pressure sensitive adhesive is applied onto the base material in a dot, or island, or stripe pattern, and that the pressure sensitive adhesive even after application to the surface of vehicle body coating retains a holding power to such a degree that an interstice leading to outside is caused to remain between pattern forming dots, or islands, or stripes.

Description

 Specification

 Surface protection sheet

 Technical field

 TECHNICAL FIELD [0001] The present invention relates to a vehicle body painted surface protective sheet that protects a top coat surface of a vehicle body of a painted vehicle.

 Background art

 Conventionally, it is known that a surface protection sheet having an adhesive layer is attached to an adherend as a means for protecting the top coat surface of a vehicle body of a finished paint vehicle. Here, skill is required to apply the flat surface protection sheet to the curved surface of the vehicle body, and if it breaks, bubbles are likely to be generated. In order to eliminate air bubbles, some protective sheets have been devised to soften the material of the sheet or provide holes for removing air bubbles so that the adhesive is fully adhered to the coating surface. Has been. However, the skill of the operator was still necessary, and not everyone could fold it completely and apply it without bubbles.

 [0003] Here, when this crease or the like occurs, rainwater that has entered from the crease crease or the like remains for a long time while being in contact with the coating surface that is difficult to evaporate. For this reason, when the coating film that is the adherend is susceptible to water, it swells, and this part becomes a mark, causing a problem in appearance. Yes. In particular, in recent years, paints that are easily affected by water, such as emulsion paints, are often used due to environmental considerations.

 Disclosure of the invention

 Problems to be solved by the invention

[0004] Here, Patent Document 1 has a problem similar to that described above, in which moisture is retained between the protective sheet and the adherend for a long period of time, resulting in deterioration or discoloration of the coating film. It is written. However, the problem raised in this document is only a problem when the coating surface is adhesively protected in a state of containing moisture, and it is protected after application due to creases such as those described above. This is not a problem of moisture that will be present between the sheet and the adherend. Therefore, the surface protection sheet according to this document is present on the adherend at the time of application. Although it functions effectively against moisture, it functions rather negatively when rainwater or the like invades after breakage. Specifically, the surface protection sheet according to the document has a structure in which a porous layer (nonwoven fabric, etc.) is provided to absorb moisture and gradually release it in order to easily evaporate moisture that has entered the interior. Yes. That is, the porous layer itself functions to absorb moisture like a sponge or a sponge. Therefore, when exposed to bad weather in the situation where folds or the like are generated as described above, the porous material rather actively retains the external rainwater that has entered the folds and the like. End up. And until this water | moisture content evaporates gradually from the sheet | seat side surface by osmosis | permeation effect | actions, such as a capillary phenomenon, the coating-film surface itself will be left in a humid state for a long time. If non-woven fabric that absorbs water is used, mold and the like may be generated in a humid environment such as the rainy season, and the use of fungicides is not preferable considering the impact on the environment.

 [0005] Therefore, the present invention provides a crease for protecting a top coat surface of a finished vehicle body, particularly a top coat surface to which a water-sensitive paint such as an emulsion paint is applied. The purpose is to provide a means that does not cause defects in appearance such as swollen marks even if rainwater enters from there.

 [0006] Patent Document 1: JP-A-10-330704

 Means for solving the problem

 [0007] As a result of earnest research, the present inventor has applied a pattern to the adhesive, and even after applying the surface protective film to the painted surface of the vehicle body, the gap between the pattern-coated adhesive is connected to the outside. The inventors have found that the above-mentioned problems can be solved by using a pressure-sensitive adhesive having such a holding power as to cause the present invention, and have completed the present invention.

 [0008] Specifically, in the present invention (1), in the vehicle body painted surface protective film in which an adhesive is disposed on at least one side of the substrate, the adhesive is in the form of dots, islands or stripes. It is coated on the material and has a holding power enough to leave an external gap between dots, islands, or stripes that make up the pattern even after application to the surface of the car body. It is a vehicle body painted surface protective film or sheet characterized by being.

[0009] It should be noted that there is a technique similar in appearance to the vehicle body painted surface protective film according to the present invention. . For example, in Japanese Patent Application Laid-Open No. Sho 63-223081 and Utility Model Registration No. 258798, an adhesive is patterned in the form of dots, islands, or stripes in order to prevent residual air stagnation (blowing) after application. The coated adhesive sheet (for example, wallpaper) is described. Here, when the pressure-sensitive adhesive sheet is affixed lightly, the tips of each of the many small convex portions of the pressure-sensitive adhesive layer are in close contact with the surface of another object, and the reference flat surface of the pressure-sensitive adhesive layer and other There is a gap communicating with the surface of the object. From this gap, air can be easily extracted to the outside and can be attached without causing blisters. However, after sticking well without causing blistering (light sticking), this sticking is performed by pressing the adhesive sheet strongly. At this time, the adhesive pattern collapses, and the gap communicating with the outside is eliminated. In this way, although it has a similar configuration, (1) there is no problem of appearance defects such as swollen marks due to rainwater invading when a crease occurs, and (2) water such as emerald paint It is different from the application of “For the top coat surface of the car body” that is applied in an environment where it can be exposed to bad weather outdoors because sensitive paint is applied (therefore, the problem of water content is completely considered) (3) These similar technologies differ in that the adhesive pattern collapses and there is no gap communicating with the outside when in use (when temporarily pasted rather than temporarily attached).

 [0010] The present invention (2) is the vehicle body painted surface protective film or sheet according to the invention (1), wherein the holding force is 0.5 mm or less.

 The invention's effect

 [0011] According to the present invention, even after being applied to the painted surface of the vehicle body, there is a gap between the dots constituting the pattern, between the islands, or between the stripes, so that the external gap remains and the ventilation is good. Even if a crease breaks off at the time of rain and the rainwater enters, the rainwater that has entered can be evaporated in a short period of time, thereby preventing appearance defects such as S There is an effect that it becomes possible to do. In addition, as an additional effect in manufacturing, since pattern coating is applied, if the amount of the adhesive used is less than the entire surface coating, it has the advantages of cost reduction and resource saving.

 BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described more specifically. As mentioned above, the vehicle body painted surface according to the present invention In the protective film, the adhesive is (1) patterned on the base material in the form of dots, islands or stripes, and (2) the pattern is applied even after being applied to the surface of the vehicle body. It has a holding power enough to leave a gap connected to the outside between dots, islands, or stripes constituting the screen. Hereinafter, each component will be described.

[0013] First, the "base material" used in the present invention is not particularly limited, and includes all materials used as a surface protective sheet or film support or surface material. The substrate may be a single layer or a laminate. Here, examples of the material used for the substrate include thermoplastic resins such as polyolefin resin, nylon resin, and polyester resin, or a mixture thereof. For example, the polyolefin resin used for the substrate includes EVA, EEA, ionomer, polyethylene, polypropylene, ethylene / propylene copolymer and ethylene / α-olefin copolymer and mixtures thereof. Also, a metal vapor deposition film or a metal film having no thermoplasticity can be used as a substrate. In addition, titanium oxide or carbon black may be blended in the base material for the purpose of blocking ultraviolet rays. In addition, the base material may contain at least one of an antioxidant, an ultraviolet absorber, an ultraviolet stabilizer (HALS), an antistatic agent, a lubricant, and a release agent, as long as the object of the present invention is not impaired. You can mix them. Here, the thickness of the base material is not particularly limited, but considering workability, a force S depending on the material of the base material S, 10 to: 1,000 / im is appropriate. In addition, on one side of the base material, preferably on the side of the base material opposite to the adhesive, a design of characters, information, patterns, pictures, photographs, etc., or single color printing may be applied.

 [0014] Next, the "adhesive" used in the present invention leaves a gap that leads to the outside between the dots constituting the pattern, between the islands, or between the stripes even after being applied to the surface of the vehicle body coating. As long as it has the holding power of, it will not specifically limit, For example, an acrylic type, rubber type, a silicon type, a polyolefin type | system | group is mentioned. In order to prevent the adhesive from flowing and crushing the pattern after being applied to the coating film, the adhesive preferably has a holding power of 0.5 mm or less. Here, the “holding force” in the claims and the present specification refers to a numerical value measured according to the following test method.

 [0015] <Retention force test method>

Adhesive sheet 20 mm wide x 50 mm long touches one end of the glass plate with an area of 20 x 20 mm ² Affix as follows. Next, the pressure-sensitive adhesive sheet is pressure-bonded once and again using an lkg roller. After standing for 30 minutes, the glass plate (sticking surface) was placed vertically, lkg of weight was hung on the play portion of the adhesive sheet, and the deviation of the adhesive sheet after leaving for lh at the specified ambient temperature was read. When the film was stretched, the measurement was performed by backing the back of the protective sheet with an adhesive tape or the like.

 * Holding power test panel: glass plate

 * Test sample

 Paste thickness: Ι Ο μ ΠΙ

 Base material: ΡΕΤ25 μm (primer-treated)

 * Test temperature: 23 ° C50% RH

[0016] The application pattern of the pressure-sensitive adhesive in the present invention is not particularly limited as long as it is in the form of dots, islands or stripes (including combinations thereof), and representative ones are shown in FIGS. However, the present invention is not limited to the patterns shown in these drawings (for example, elliptical islands and zigzag stripes). In addition, since the shape of the pressure-sensitive adhesive only needs to be a dot shape, an island shape, or a stripe shape, for example, a form in which the dot shape, the island shape, or the stripe pattern is formed as a convex portion on the adhesive surface. Is also included. Here, the interval (gap) between the patterns is not particularly limited, but is preferably at least 0.3 mm apart even at the narrowest part. The thickness of the adhesive on the pattern is not particularly limited, but 3! ~ 500 μπι is preferred.

 Next, a method for producing a vehicle body painted surface protective film or sheet according to the present invention will be described. The film or sheet can be produced by applying the pressure-sensitive adhesive composition to the substrate described above by a known method. Here, the application method of the adhesive is not particularly limited. For example, screen printing method, melt blow method, gravure coating method, slot die coating method, comma direct coating method (stripe coating possible), transfer method, etc. Can be used.

 Example

[0018] Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples. In addition, "part" in this specification means a mass part. [Example 1]

 <Base material: Polyolefin film>

 Basell Polypropylene (Moprene 440G MFR = 1.3g / l0min, 230. C, 2.16kg) and Ishihara Sangyo Co., Ltd. titanium oxide (Typeta A220) were kneaded at a weight ratio of 93: 7. A film formed in a thickness of μm was used.

 <Adhesive: Polyolefin (Retention force 0. lmm)>

 Kanesiki SIBS (SIBSTER102T) · · · 100 copies

 Arakawa Chemical Industries, Ltd. Rosin ester tackifier resin (Pine Crystal KE100) • · · 20 parts

 Softening agent (Nisseki Polybutene HV300) manufactured by Nippon Petrochemical Co., Ltd. 10 parts

 Kawaguchi Chemical Co., Ltd. Phenolic antioxidants (ANTAGE W500) · · · 1 part Ciba Specialty Chemicals Co., Ltd. Benzotriazole ultraviolet absorbers (Tinuvin Ρ) · · · 1 part

 The composition comprising the above components was applied by a hot melt method using a small screen printer so that the pressure-sensitive adhesive had a thickness of 30 μm in the pattern shown in FIG.

[0020] [Example 2]

 Example 1 was followed except that the following adhesive was used as the adhesive.

 <Adhesive: Rubber type (holding force 0.3 mm)>

 Exon polyisobutylene (Vistanex MML80) · · · 100 copies

 Idemitsu Petrochemical Polybutene (Idemitsu Polybutene 300R) · · · 10 parts

 Ara J 11 Chemical Industry Co., Ltd. Rosin ester tackifying resin

 (Pine Crystal KE100)

 Cinder Specialty Chemicals Hindered Phenolic Antioxidants (Ilganox 1010)

 Benzotriazole UV absorber manufactured by Ciba Specialty Chemicals

(Chinubin Ρ)

 A composition composed of the above components is used in a hot-melt method and a small screen printer is used.

With the pattern shown in 5, it was applied so that the pressure-sensitive adhesive thickness was 30 μm. [Comparative Example 1]

 Except that the adhesive was applied to the entire surface so as to have a thickness of 30 zm, it was in accordance with Example 1 (that is, the pattern coating was not possible).

 [0022] [Evaluation of practicality]

 <Substrate: Difficult-adhesive acrylic film>

 (PPG, wettability tilS Z0237 compliant) We used a clear adhesion resistant acrylic paint clear coating for automobiles of less than 30 dyn m. The panel size is 70mm X I 50mm.

 <Evaluation method>

 A sample is stuck on the adherend. At this time, water droplets were dropped on the adherend (about 0. Ice), and a sheet was attached from above. After leaving this in a constant temperature and humidity room at 23 ° C 65% RH for 72 hours, the sample is peeled off and the surface of the coating film is observed with the naked eye.

 <Evaluation results>

 In both Example 1 and Example 2, the water droplets inside were evaporated and the marks were good. On the other hand, in Comparative Example 1, water remained in the water droplet portion, and even when the surface was wiped, swelling of the coating film was observed.

 Industrial application fields

 [0023] The present invention can be used for protection against damage, blurring, and discoloration of the top coating surface of a vehicle body during transportation of a painted vehicle or during outdoor storage.

 Brief Description of Drawings

 FIG. 1 is a view showing an example of a coating pattern of an adhesive (dot shape) in a vehicle body painted surface protective film or sheet according to the present invention. Here, the left figure is a top view and the right figure is a side view. In the figure, A represents an adhesive and B represents a substrate (the same applies hereinafter).

 [FIG. 2] FIG. 2 is a view showing an example of an application pattern of an adhesive in an automotive body surface protection film or sheet according to the present invention (island shape). Here, the left figure is a top view and the right figure is a side view.

FIG. 3 is a diagram showing an example of an application pattern of an adhesive (island shape) in a vehicle body painted surface protective film or sheet according to the present invention. Here, the left figure is a top view and the right figure is a side view. [FIG. 4] FIG. 4 is a view showing an example of an application pattern of a pressure-sensitive adhesive in a car body painted surface protective film or sheet according to the present invention (stripe shape). Here, the left figure is a top view and the right figure is a side view.

5] FIG. 5 is a diagram showing a coating pattern of the adhesive (dot shape) in the vehicle body painted surface protective film or sheet according to the example. Here, the upper figure is a side view and the lower figure is a top view.

Claims

The scope of the claims

 [1] At least in a car body painted surface protective film or sheet in which an adhesive is disposed on at least one side of the substrate,

 The adhesive is

 On the base material, a pattern is applied in the form of dots, islands, or stripes, and is connected to the outside between the dots constituting the pattern, between the islands, or between the stripes even after being applied to the surface of the vehicle body. A vehicle body-painted surface protective film or sheet having a holding power enough to leave a gap.

[2] The car body painted surface protective film or sheet according to claim 1, wherein the holding force is 0.5 mm or less.