JPH0770522A - Protective adhesive film - Google Patents

Abstract

PURPOSE:To obtain a protecting adhesive film which facilitates removal of air bubbles at the joining interface and does not impair the appearance of a bill medium. CONSTITUTION:A discontinuous adhesive layer 2 is formed on one side of a base film 1 in such a manner that the parts 3 uncoated with the adhesive continue as far as at least one edge of the base film 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective adhesive film for protecting signboard media such as photographic film, photographic paper and posters from sunlight, ultraviolet rays, rainwater and the like.

[0002]

2. Description of the Related Art Photographic film, photographic paper,
Although posters and the like are widely used, since photographic film and photographic paper are coated with a silver salt emulsion, they are susceptible to discoloration under the influence of sunlight and ultraviolet rays, especially when used outdoors. Also, printed materials such as posters may fade or discolor when used outdoors for a long time. Further, outdoors, signboard media such as photographic film, photographic paper, and posters are easily damaged due to the effects of rainwater, wind, dust, etc. and intentional vandalism. Even if it is used indoors, it may cause discoloration or damage, although it is not as good as outdoor use.

Conventionally, a protective adhesive film has been devised in order to prevent discoloration or breakage of the signboard medium, and in particular, in order to prevent discoloration due to sunlight or ultraviolet rays, a film containing an ultraviolet absorber is used as a base material. The protective adhesive film used was used.

The protective adhesive film has a structure in which a transparent plastic film is used as a base material and an adhesive layer is formed on one surface of the transparent plastic film. Generally, the adhesive is applied uniformly without voids. As a result, air is left at the adhesive interface when the protective adhesive film is applied to the signboard medium while being pressed by a press stand, laminator roll, etc., or heated if necessary, so that the letters and patterns of the signboard medium, etc. The appearance of is likely to be impaired. That is, since the portion where the air remains looks like marbling, there is a problem in that the basic function of the signboard medium, which is mainly intended for advertisements, to be clearly and easily seen is greatly impaired.

As one means for solving this problem, a method has been adopted in which a plastic film having fine holes for air venting is used as a base material. In the case of this method, the hole after performing the purpose of venting air,
It is blocked by the flow of the adhesive due to pressure or heat during application, or if a thermoplastic plastic film is used, the heating during application causes the plastic film to close the holes and It is said that it will not survive.

However, in reality, it is difficult to completely close all the holes, and in the case of outdoor use, rainwater may invade from the holes left unclosed to damage the signboard medium,
Problems such as sunlight and UV rays entering the sign medium and discoloring remain. Further, even in the case of indoor use, there still remains a problem that the signboard medium is contaminated or discolored due to infiltration of dust or the like.

As another means, in order to protect the signboard medium, a signboard medium such as a poster is sandwiched between a substrate having an adhesive layer on the front surface and a transparent protective plate having an adhesive layer on the back surface. A poster panel having an adhesive structure has been proposed (Japanese Utility Model Publication No. 55-84670), but this method also does not solve the problem that air remains at the adhesive interface and the appearance of the signboard medium is impaired.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and provides a protective adhesive film which can easily eliminate air at the adhesive interface and does not impair the appearance of a signboard medium. With the goal.

[0009]

In the protective adhesive film of the present invention, a discontinuous adhesive layer is formed on one surface of a base film, and a non-coated portion of the adhesive is formed on at least one side of the base film. It is essential to be continuous to the end, which achieves the above objectives.

As shown in FIG. 1, the protective adhesive film of the present invention comprises an adhesive layer 2 on one surface of a base film 1.
Are formed in an intermittent state, and the adhesive layer 2 and the release-treated surface of the release paper 4 are bonded together.

The type of film used as the base material of the protective adhesive film of the present invention is not particularly limited, and transparent plastic films such as polyethylene terephthalate, stretched polypropylene, polycarbonate, polyethylene and soft vinyl chloride can be used. It is preferably used.

The thickness of the base film 1 is not particularly limited, but is preferably about 10 to 100 μm, and more preferably about 30 to 70 μm.

The adhesive layer 2 in the protective adhesive film of the present invention is formed by coating one surface of the base film 1 with the adhesive in an intermittent state.

The term "intermittent adhesive layer 2" as used herein means that the adhesive is not applied to the entire surface of one side of the base film 1, but is applied with a certain width. Adhesive layer 2 applied in stripes in which layers 2 and non-coated portions 3 having a constant width are alternately formed, or adhesive layer 2 in which adhesive is applied in a dot shape with a constant diameter However, the present invention is not limited to these.

Further, in the protective adhesive film of the present invention, the non-coated portion 3 of the adhesive needs to be continuous to at least one end of the base film 1.

The non-coated part 3 of the adhesive is the base film 1
By continuing to the end of at least one side of,
This serves as a flow path for air, and when the protective adhesive film is attached to the signboard medium, the air at the adhesive interface is easily removed.

The type of adhesive used in the protective adhesive film of the present invention is not particularly limited, and rubber-based pressure-sensitive or heat-sensitive adhesives, acrylic pressure-sensitive or heat-sensitive adhesives, etc. may be used. It is preferably used.

The 180 ° angle peel strength of the protective adhesive film of the present invention to the cold rolled stainless steel sheet is 50.
It is desirable that the width is in the range of 0 to 2000 g / 25 mm. Protective adhesive film for stainless steel plate 1
If the 80-degree angle peel strength is less than about 500 g / 25 mm width, the adhesive strength is too low to fully function as a protective adhesive film, and if it exceeds about 2000 g / 25 mm width, the re-adhesion and repair work at the time of adhesion is difficult. It will be difficult.

The coating thickness of the adhesive layer 2 which is intermittently formed on one surface of the substrate film 1 is not particularly limited, but the thickness after drying is in the range of about 10 to 50 μm. It is desirable that the thickness is in the range of 20 to 40 μm.

The coating thickness of the adhesive layer 2 is 1 after the film thickness after drying.
If it is less than about 0 μm, the coating becomes difficult and the adhesive strength becomes weak. On the other hand, if it exceeds about 50 μm, excessive coating will result in high cost.

The protective adhesive film of the present invention is, for example,
The product is made into a roll with a width of 1200 mm and a length of 50 to 100 m. Therefore, it is necessary to prevent the adhesive layer 2 from adhering to the back surface (non-adhesive coated surface) of the base film 1, but the method is to apply a release agent to the back surface of the base film 1 and release it. A method of performing a mold treatment may be used, or a method of using the release paper 4 and bonding the release-treated surface of the release paper 4 and the adhesive-coated surface of the protective adhesive film may be used.

[0022]

The protective adhesive film obtained by the present invention is
Since the adhesive layer is formed on one surface of the base film in an interrupted state, the non-coated part of the adhesive is continuous to at least one end of the base film, and there is an air circulation path. When it is attached to the signboard medium, the air at the adhesive interface can be easily removed, and the signboard medium can be protected for a long period of time without damaging the appearance. Further, it is not necessary to provide holes in the base film for removing air.

[0023]

EXAMPLES In order to explain the present invention in more detail, examples will be given below. In the examples, "part" is "part by weight".
Means

(Example)

( 1) Preparation of protective adhesive film The base film 1 contains a benzotriazole-based UV absorber, has a spectral light transmittance of 2.0% or less at 300 to 400 nm, and has a thickness of 60 μm and is made of soft chloride. A vinyl film was prepared.

Next, the acrylic solvent type heat-sensitive adhesive "A"
TH-500 "(solid content 24%, manufactured by Saiden Chemical Industry Co., Ltd.) is used, and one side of the base film 1 has a thickness of 30 μm after drying and an adhesive layer 2 having a width of 10 mm and a width of 2 mm.
After being applied and dried in a stripe shape so that the non-coated portions 3 of are alternately formed, they are attached to the release-treated surface of the release paper 4, and wound on a paper core having an inner diameter of 3 inches, and a width of 1200 mm,
A protective adhesive film having a length of 50 m was obtained.

( 2) Evaluation Table 1 shows the results of evaluation of the adhesive strength, sticking property and appearance of the protective adhesive film thus obtained one year later.

Adhesive strength : According to JIS Z-0237 "Adhesive tape / adhesive sheet test method", a protective adhesive film cut into a width of 25 mm and a length of 150 mm has a thickness of 2.
Bonding length 100 mm to 0 mm cold rolled stainless steel plate
And then left for 24 hours in an atmosphere of 23 ° C.-65% RH, and in that atmosphere, a 180 ° angle peel strength (g / 25 mm) at a pulling speed of 300 mm / min using a Shopper type tensile tester. It was measured.

[0029] The paste of: fresh green mountain landscape height 1200mm that contains as a pattern, a color photographic paper having a width of 2000mm as billboard media, paste the adhesive coated surface of the protective adhesive film on the photo surface The adhesiveness was evaluated by observing the state of air remaining at the adhesive interface after attachment and the appearance of the signboard medium. In addition, for the attachment, a laminator heat roll is used, the roll temperature is 40 ° C., and the roll pressure is 5 k.
It was performed at g / cm ² and a roll peripheral speed of 500 mm / min.

Appearance after 1 year : The signboard medium to which the protective adhesive film, which was created by the evaluation of the sticking property, was stuck outdoors, and the appearance of the signboard medium and the protective adhesive film after 1 year was observed. .

(Comparative example)

In the production of the protective adhesive film, the same adhesive as that used in the examples was used and the base film 1
A protective adhesive film was obtained in the same manner as in the example except that coating and drying were performed so that the film thickness after drying was 30 μm on the entire surface of one side.

Table 1 shows the results of evaluation of the adhesive strength, sticking property and appearance after 1 year of the resulting protective adhesive film in the same manner as in the examples.

[0034]

[Table 1]

[0035]

As described above, the protective adhesive film according to the present invention can easily eliminate the air at the adhesive interface when it is attached to a signboard medium, so that the signage medium is not damaged at all. Is to protect the long term reliably.

[0036]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a protective adhesive film.

[0001]

[Explanation of symbols]

 1 Base Film 2 Adhesive Layer 3 Non-Coated Area 4 Release Paper

Claims (1)

[Claims] 1. A protection characterized in that a discontinuous adhesive layer is formed on one surface of a base film, and a non-coated part of the adhesive is continuous to at least one end of the base film. Adhesive film.