JP2565306Y2 - Window glass film - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film for a window glass to be attached to a window glass or the like for the purpose of blocking heat rays, preventing eyes, preventing fogging, preventing dew condensation, or preventing contamination.

[0002]

2. Description of the Related Art As a film to be adhered to a window glass for shielding heat rays, for example, Japanese Utility Model Laid-Open No. 50-115.
No. 979, Japanese Utility Model Laid-Open No. 51-49783, and Japanese Patent Laid-Open No. 51-78261 are known. In these conventional films, after forming a heat ray blocking layer such as an aluminum evaporation layer on a transparent synthetic resin film such as polyester, an adhesive is applied to the film to form an adhesive layer. Adhered to window glass etc. by layer.

In general, a release paper or a release film is stuck on the pressure-sensitive adhesive layer, and the release paper or the like is peeled off when used.

[0004]

However, the conventional window glass film is also provided with a purpose of preventing scattering when the glass is broken, and therefore has a high adhesive strength to the glass and is difficult to peel when peeling. There was a problem. In some cases, it was not particularly easy to remove. There is also a problem that the adhesive remains on the glass surface, so-called glue residue occurs.

An object of the present invention is to solve such a conventional problem and to provide a film for a window glass which can be easily attached and which can be easily peeled off without any adhesive residue. It is in.

[0006]

SUMMARY OF THE INVENTION A window glass film according to the present invention comprises a base film and an adhesive layer formed of a curable resin formed on the base film. Cured between the non-adhesive resin layer and the base film surface, the adhesive strength between the adhesive layer and the glass being 1.5 to 10 N /
It is characterized in that it is formed to have a width of 100 mm.

As the base film used in the present invention, for example, a synthetic resin film generally used conventionally can be used. Specifically, a polyester film, a polypropylene film, or the like can be used.

In the present invention, as the curable resin forming the adhesive layer, any resin can be used as long as it is a type of resin which is cured by heating or the like. Generally, a two-pack type curable resin used by adding a curing agent is used. Examples of such a resin include a resin obtained by adding an isocyanate-based curing agent to an acrylic copolymer-based resin, and a rubber-based resin.

[0009]

In the window glass film of the present invention, the adhesive layer is formed by curing a curable resin. In a conventional window glass film, if it is left for a long time after pasting it on a window glass, etc., the adhesive layer is hardened by ultraviolet rays of sunlight, etc., and the adhesive strength with glass becomes higher than when it is bonded. There has been a problem that it is difficult to peel off when peeling off from the sheet. Since the curing reaction proceeds in the state of being bonded to the glass, the adhesiveness with the glass is increased, and the adhesive layer is left on the glass at the time of peeling, so that so-called adhesive residue is easily generated.

In the window glass film of the present invention, since the adhesive layer is previously cured and the cohesive force is strengthened, the curing reaction proceeds remarkably in a state of being adhered to the glass as in the conventional case, and the glass layer is firmly bonded to the glass. There is no such thing as bonding. For this reason, even at the time of peeling, it can be easily peeled off without generating adhesive residue.

In this invention, the adhesive strength to glass is 1.
The curable resin is cured so as to have a width of 5 to 10 N / 100 mm to form an adhesive layer. The adhesion strength to this glass is determined by JI, a Japanese industrial standard for window glass films.
This is the strength measured based on the adhesive strength test specified in SA5759.

Adhesive strength to glass is 1.5N / 100m
If the width is smaller than m, the adhesive strength is too weak, and there is a possibility that the adhesive will be peeled off by hand or spontaneously by wind or slight impact, which is not suitable for practical use.

Further, the adhesive strength to glass is 10 N / 100.
If the width exceeds mm, a large force is required for peeling,
It is difficult to remove easily.

In the present invention, since the curable resin is applied onto the base film and then cured, the adhesiveness between the adhesive layer and the base film can be made higher than that of the conventional one.

[0015]

FIG. 1 is a sectional view showing an embodiment of the present invention. FIG.
With reference to, an aluminum vapor-deposited layer 2 is formed on a polyester film 1 as a base film. This aluminum vapor-deposited layer 2 blocks the heat rays and improves the indoor cooling and heating effect. An adhesive layer 3 is formed on the aluminum deposition layer 2. An untreated OPP (stretched polypropylene) film 4 is bonded on the adhesive layer 3. This unprocessed OPP film functions as a release film.

The curing of the adhesive layer 3 can be carried out with the untreated OPP film 4 as a release film as shown in FIG. In such a state, the adhesive layer 3 is cured at a temperature of, for example, 30 to 80 ° C. for about one day to one week to perform a curing reaction of the adhesive layer 3. Although the adhesiveness of the adhesive layer 3 to the polyester film 1 is improved by such a curing reaction of the adhesive layer 3, the adhesiveness to the untreated OPP film 4, which is a release film, does not increase so much. An adhesive strength that can be peeled off as a film is maintained.

The conventional window glass film also has a purpose of preventing scattering when the window glass is broken, and thus generally has a high adhesive strength and a large amount of an adhesive layer. For example, the adhesive layer was formed with an adhesion amount of ^{20 to} 30 g / m ² . For this reason, in the conventional window glass film,
An adhesive layer was once formed on release paper with an adhesive processing machine, and this adhesive layer was transferred onto a base film. For this reason, only low speed processing of about 20 to 40 m / min can be performed.
The cost was also high.

The window glass film of the present invention has an adhesive strength to glass of 1.5 to 10 N / 100 mm width, and therefore does not require a large amount of adhesion as in the past, for example, 2.5 g / m ^2. A small amount may be used. For this reason,
The adhesive layer can be directly formed on the base film by the dry laminating machine, and the processing can be performed at a higher speed than in the past, so that the production can be performed at low cost.

Embodiment 2 FIG. 2 is a sectional view showing another embodiment of the present invention. Referring to FIG. 2, a protective coat layer 11 for protecting polyester film 12 is formed on one side of polyester film 12 as a base film. On the other side of the polyester film 12, a printing layer 1 is formed.
3 are formed. The first adhesive layer 14 is provided on the printing layer 13. The first adhesive layer 14 includes
A polyester film 16 having an aluminum deposition layer 15 on one side is bonded. On the other side of the polyester film 16, a second adhesive layer 17 is formed. An unprocessed OPP film 18 as a release film is adhered on the second adhesive layer 17.

The film for a window glass as shown in FIG.
For example, it can be manufactured as follows. A curable resin is applied to both sides of a polyester film 16 provided with an aluminum vapor-deposited layer 15 on one side to form a first adhesive layer 14 and a second adhesive layer 17, respectively. Next, the protective coating layer 11 is provided on the first adhesive layer 14 side and the printed layer 1 is provided on one surface side.
3 is bonded to the polyester film 12 formed on the other side, and the untreated OPP film 18 is bonded to the second adhesive layer 17 side. In this state, the first adhesive layer 14 and the second adhesive layer 17 are heated and cured by heating at a predetermined temperature and for a predetermined time.

Hereinafter, an experimental example will be described. 1.5 to 4 parts of an isocyanate-based curing agent per 100 parts of an acryl-based copolymer resin (resin content: about 30%; solvent: toluene acetate) as a curable resin serving as an adhesive layer is used. And the amount of coating was 1.5 g / m
And gravure coat was applied in ^{2 ~5g} / m ^2, this 5
The film was cured by heating at a temperature in the range of 0 ° C. to 80 ° C. to produce a window glass film having a structure as shown in FIG. At this time, the bonding strength of the second adhesive layer 17 to the glass was as shown in Table 1.
As shown in Table 1, films having various adhesive strengths were produced by changing the amount of the curing agent, the amount of the adhesive layer applied, the curing temperature and the time so as to vary in the range of 1 to 12 N / 100 mm.

This film was actually adhered to glass, and the easiness of the attaching operation and the easiness of the peeling operation were evaluated.

As a method of sticking to the glass, the surface of the washed glass is wetted with water containing a small amount of a neutral detergent, a film is stuck on the surface of the washed glass, and the space between the glass and the sheet is sandwiched with a spatula of plastic. It was pasted so as to squeeze out the water. After being left at room temperature for 48 hours, it was peeled off from the glass.
Table 1 shows the ease of sticking work and the ease of peeling work.
It was represented by x and evaluated. ○ indicates easy, Δ indicates slightly difficult, and × indicates difficult.

[0024]

[Table 1]

Experiment No. 1 having a glass adhesive strength of 1 N / 100 mm width. Sample No. 1 could not be adhered to glass and spontaneously peeled off. Experiment No. 1 having an adhesive strength of glass of 12 N / 100 mm width. In the case of No. 6, peeling was somewhat difficult.

In the above Experiment No. No adhesive residue was observed in any of the sheets 1 to 6 at the time of peeling.

Example 3 In order to examine the effect of the curing of the adhesive layer, a cured adhesive layer and a non-cured adhesive layer were prepared and evaluated. A curable resin obtained by adding 2 parts of an isocyanate-based curing agent to 100 parts of an acryl-based copolymer resin having a resin content of about 30% is applied so as to have an application amount of 2 g / m ^2, and this is applied to a second adhesive layer. A film having the structure shown in FIG. The film was cured by heating at 60 ° C. for one week. The glass adhesive strength of the second adhesive layer 17 of the obtained film was 5 N / 100 mm width.

For comparison, a second adhesive layer 17 was prepared without heating and curing. The adhesive strength of the second adhesive layer 17 not cured by heating to glass is 15 N / 100.
mm width.

The heat-cured film and the non-heat-cured film were both adhered on glass and peeled off one month later. The heat-cured film could be peeled off without leaving a glue residue on the glass surface, whereas the film that was not heat-cured had a glue residue left on the glass surface.

Embodiment 4 FIG. 3 is a sectional view showing still another embodiment of the present invention. Referring to FIG. 3, OP having one surface subjected to corona discharge treatment
A print layer 22 is formed on the processed surface of the P film 21, and a first adhesive layer 23 is provided on the print layer 22. A polyester film 25 having an aluminum vapor-deposited layer 24 is bonded on the first adhesive layer 23, and a second adhesive layer 26 is formed on the other surface of the polyester film 25.
Is provided. The unit from the single-sided corona-treated OPP film 21 to the second adhesive layer 26 is one unit A,
A plurality of the units A are superimposed. Therefore the second
Below the adhesive layer 26, the single-sided corona-treated OPP film constituting the lower unit A film is located. Therefore, the single-sided corona-treated OPP film on the side of the second adhesive layer 26 functions as a release film. In this way, a film for a window glass of a winding type can be manufactured by arranging a film serving as a release film on the uppermost layer and providing an adhesive layer on the lowermost layer.

In the case of the winding type, the base film may be formed by forming one surface as an untreated non-adhesive resin layer and forming an adhesive layer on the other surface, and curing the film in a wound state. In the wound state, the adhesive layer on the base film is sandwiched between the non-adhesive resin layers of the adjacent base film.

In the above embodiment, a film for preventing heat rays is shown as an example. However, the present invention can be applied to not only prevention of heat rays but also prevention of eyes, fogging, dew condensation, and condensation by selecting a film and a coating. It can also be applied to films for the purpose of preventing contamination. In addition, by using a metal film for a part of the structure, it can be applied to a sheet for shielding electromagnetic waves from a glass window.

Although an untreated OPP film is shown as an example of the release film, an untreated CPP (casted polypropylene) film, an untreated polyethylene, and a release paper coated with a generally used silicon coat may be used. it can.

[0034]

As described above, the window glass film of the present invention is formed by curing the adhesive layer, so that the curing reaction is performed in a state where the film is adhered to the window glass like a conventional film. It progresses and the adhesive strength with glass does not become abnormally high. Therefore, there is no glue residue unlike a conventional film.

In the window glass film of the present invention, the adhesive strength of the adhesive layer is 1.5 to 10 N / 100 mm.
Because of the width, vapor deposition can be performed on glass without natural peeling, and peeling can be easily performed at the time of peeling.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polyester film 2 Aluminum vapor deposition layer 3 Adhesive layer 4 Unprocessed OPP film 11 Protective coat layer 12 Polyester film 13 Printing layer 14 First adhesive layer 15 Aluminum vapor deposited layer 16 Polyester film 17 Second adhesive layer 18 Unprocessed OPP film Reference Signs List 21 single-sided corona-treated OPP film 22 printing layer 23 first adhesive layer 24 aluminum deposition layer 25 polyester film 26 second adhesive layer

Claims (1)

(57) [Scope of request for utility model registration] An adhesive layer formed of a curable resin formed on the base film, wherein the adhesive layer has a non-adhesive resin layer that is difficult to adhere to the adhesive layer; The adhesive layer is cured while being sandwiched between the base film surface and the adhesive strength between the adhesive layer and the glass.
A film for a window glass, which is formed to have a width of 5 to 10 N / 100 mm.