JP2002003655A - Watering adhesive plastic film, heat insulating sheet, or foamed sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a watering adhesive plastic sheet which adheres to a glass plate only by pressing a plastic film on a water-coated glass plate and remains so adhesive even after drying up of water as to dispense with an adhesive agent and solves the problems accompanied by using the adhesive agent. SOLUTION: This watering adhesive plastic film is formed by kneading a polyolefin resin and a hydrophilic group-content material which is compatible with the polyolefin resin and includes a hydrophilic group. The foamed sheet 3 that can be adhesive to a glass plate is either a two-layer foamed sheet formed by sticking a flatback film 32 on the bottom surface of a cap film 31 provided with many pits made by vacuum forming of a plastic film or a three-layer sheet 3 which is formed by sticking in addition a flat liner film 33 on the top of a cap, and the film that in contact with the glass includes a material kneaded having a hydrophilic group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic film or sheet (hereinafter referred to as "film").
Which can be applied to a glass plate with water. The present invention, in order to increase the efficiency of heating and cooling, plastic insulation sheet or bubble sheet,
It is especially useful when applied to glass windows only in winter or summer.

[0002] The term "water application" as used herein means that a flat glass plate such as a glass window is coated with water, and a film is pressed onto the flat plate to make it adhere to the glass plate. Means that the close contact state is maintained. This film does not fall spontaneously, but can be easily peeled off with a small force.

[0003]

2. Description of the Related Art A variety of functions can be exhibited by attaching a plastic film as shown below to a window glass.
Often done. 1. 1. Film containing UV absorber (UV cut) 2. Film with anti-fog agent (prevention of condensation) 3. Opaque film with fine irregularities on the surface (privacy protection) 4. Colored film (same as above) 5. Strong film (prevention of scattering at the time of disaster) Foam sheet (heat insulation)

[0004] In order to actually perform the pasting, the above 1 to 5
In the case of (1), an adhesive such as an acrylic emulsion is applied to a film of polyester or the like often used as a substrate, and 6 and 7 usually use a double-sided adhesive tape.

There is no problem when these films are left as they are, but when they are pasted or peeled off, for example, when a plastic foam sheet is pasted as a heat insulating material on a glass window in a cold region, the adhesive is kept even after peeling. However, "trace marks" that remain on the glass surface are inevitable, and are conspicuous in themselves, and dust may adhere to them, which may impair the aesthetic appearance. Therefore, the glass surface must be cleaned, which is a cumbersome task.

[0006] Even in the distribution stage before use, the polyester film is creased when folded, which lowers the value of the product.
There was an inconvenience of being bulky during storage.

[0007] If it is a flexible plastic film,
In many cases, water is simply applied to the glass surface and pressed on it, and the glass sticks temporarily, but when the water runs out, it will come off naturally. If the sticking is performed even after the water runs out, the sticking without the adhesive becomes possible. If such "water adhesion" becomes possible, the work of removing the adhesive after peeling the film becomes unnecessary. Flexible films can be transported and stored in a folded state.

[0008]

SUMMARY OF THE INVENTION A general object of the present invention is to use a soft plastic film which can be folded and handled, and apply the film to a surface of a glass plate by applying water thereto and pressing it. In order to provide a plastic film that can be `` water-sticked '', the state of sticking is maintained even after the water dries, thereby solving problems such as `` trace marks '' due to the use of adhesive. is there.

A special object of the present invention is to provide a plastic heat insulating sheet or foam sheet used as a heat insulating material for a glass window, which can be "sticked to water".

[0010]

SUMMARY OF THE INVENTION A plastic film that can be water-adhered to a glass plate, which achieves the general object of the present invention, has a hydrophilic group compatible with a polyolefin resin. It is obtained by kneading substances and forming a film.

[0011] A plastic heat insulating sheet that can be water-adhered to a glass plate, which achieves the special object of the present invention,
A plastic heat insulating sheet made by joining the tops of caps of a cap film provided with a number of dents by vacuum forming of a plastic film and bonding a flat liner film, and kneading a substance having a hydrophilic group in the cap film This is a heat insulating sheet.

[0012] A plastic foam sheet which can be water-adhered to a glass plate, which also achieves the special object of the present invention, is a cap film provided with a large number of depressions by vacuum forming a plastic film, and a flat back film. And a laminated sheet obtained by kneading at least one film with a substance having a hydrophilic group.

DETAILED DESCRIPTION OF THE INVENTION

[0013] The plastic film used in the present invention is not only water-applicable but also folded, whether it is water-applied itself or water-insulating sheet or foam sheet material. Therefore, polyolefin is suitable as the material, and polyethylene is most suitable as the material.

Needless to say, the hydrophilic group is represented by -OH, =
Refers to groups such as O and -O-. It is preferable that a molecule or an atomic group containing such a group has a chemical structure having high polarity. A typical example of a compound having a hydrophilic group that is easy to use in combination with a polyolefin is an acrylic compound. Specifically, it is an ester of acrylic acid and methacrylic acid and their lower aliphatic alcohols. Maleic anhydride and its esters are also useful for the present invention.

Since a compound having a hydrophilic group having a low molecular weight has a possibility of bleeding, it is preferable that the compound having a high molecular weight be compatible with the plastic used. The high-molecular-weight and hydrophilic substance is a compound having a hydrophilic group, or a compound having a hydrophilic group and a compound having no hydrophilic group, and further including a third compound, a copolymer, an interpolymer, Graft polymers and the like. Among the trials by the inventors so far, a polymer obtained by graft-polymerizing acrylic acid and maleic anhydride to a polyolefin was the most suitable.

On the other hand, surfactants such as mono- or diglycerin fatty acid esters are also useful as substances having a hydrophilic group. It is also possible to use a polymer in which the above-described hydrophilic group is incorporated in the molecule and a surfactant in combination.
It is effective.

The mixing ratio of the polyolefin and the substance having a hydrophilic group is influenced by factors such as the compatibility of the two, the density of the hydrophilic group in the latter, or the thickness of the film. As such, some experimentation should be performed as needed to determine the optimal ratio in each case.

The reason why the film of the present invention can be applied to water is understood to be based on the following mechanism. That is, as shown in FIG. 1A, when water is applied to a glass plate (G) such as a window glass and a water-adherable film (1) is pressed thereon, the glass plate and the plastic film become water (W) 1B due to the interfacial tension. If left undisturbed, the water will evaporate, partly from the open end and partly through the plastic film and gradually escape to the outside, as seen in FIG. 1C.

With this, the plastic film comes into close contact with the glass plate, and finally, a small amount of moisture determined by the equilibrium relationship with the surrounding humidity remains between the glass plate and the plastic film. As shown in FIG. 2, a hydrogen bond is formed between -H (δ +) of the water molecule of the residual moisture and -O (δ-) derived from SiO ₂ or the like, which is considered to be large on the surface of the glass. On the other hand, hydrophilic groups appearing on the surface of a plastic film, typically ＝ O and -O- (both δ
A hydrogen bond also occurs between-) and -H (δ +) of the water molecule.

Although the hydrogen bond itself has a relatively weak force, a large number of hydrogen bonds exhibit a certain bonding force. When a plastic film is stuck to the glass plate, almost no stress is applied in the direction of peeling the two, and the state is preserved for a long time. However, since the sticking force is weak as described above, if you want to peel it off, pull it off by holding the edge of the plastic film,
It can be removed from the glass plate quite easily.

Various aspects of the present invention are possible. For example, a plastic film to which an ultraviolet absorber is added as described above is one of them, and a plastic film in which fine irregularities are provided on a side not in contact with a glass plate to adjust the transparency is another embodiment.

In still another embodiment, as shown in an exaggerated manner in FIG. 3, at least the thickness of the water-adherable film (1) to be attached to a glass plate is opposed from one side (11). It has a gradient that gradually changes toward the other side (12), and is configured such that water is applied to the glass plate (G) with the thin side on the top and the thick side on the bottom. is there. This embodiment has the advantage that the film is less likely to be flipped and peeled off from the upper side by its own weight. This benefit is obtained not only for a single film but also when applied to a film to be attached to a glass plate, such as the above-mentioned plastic heat insulating sheet or bubble sheet.

As a heat insulating sheet made of plastic and suitable for sticking to a window glass, there is a product already disclosed by the applicant (Japanese Patent Application Laid-Open No. H10-156984), for example, as shown in FIG. It has a structure consisting of a cap film (21) and a liner film (23). As shown in FIG. 5, when the water-sealable heat-insulating sheet (2) is stuck to the glass plate (G), the cap formed by vacuum forming has an independent air chamber ( 2
Due to the formation of 4), a high heat insulating effect is produced despite the simple structure. Since the bottom surface of the cap film is flat and the portion in contact with the glass plate occupies a relatively large proportion in the projected area, it is suitable for water application.

The plastic foam sheet having the above-mentioned two-layer structure also has a large number of independent air chambers by itself. Bubble sheets have been widely used for cushioning packaging and the like since ancient times, but are often used as heat insulating materials because of their heat insulating effect. The bubble sheet includes not only a two-layer structure but also a three-layer structure, and the present invention can be applied to such a structure. That is, a cap film (31) provided with a number of dents by vacuum forming of a plastic film and a flat back film (32) are bonded together, and another flat liner film (33) is placed on top of the cap of the cap film. The present invention also relates to a plastic foam sheet which is a three-layer foam sheet obtained by laminating a material having a hydrophilic group on at least one of a back film and a liner film and which can be water-pasted on a glass plate. include.

In the case of a three-layer foam sheet, a preferred embodiment is one in which the liner film is thinner than the back film and a material having a hydrophilic group is kneaded in the liner film, and thus the liner film side is attached to a glass plate. .

[0026] In the actually manufactured three-layer foam sheet, the liner film is thinner than the back film. To be more precise, on the back film side of the three-layer foam sheet, the non-cap portion of the cap film is laminated on the back film, and on the liner film side, the liner film is laminated on the top of the cap of the cap film. It was done. The cap film is
Extruded as the thickest film intended to undergo vacuum forming, the top of the cap is stretched and thinned during forming, while the non-cap portion retains its original thickness. The back film does not need to be as thick as the cap film, but needs to have a certain thickness to ensure the strength of the bubble sheet. In contrast, the liner film may be thin. As a result, the back film side on which thick ones are laminated is thicker than the liner film side on which thin ones are laminated. As will be easily understood, the thinner the plastic film is, the easier it is to adhere to the glass plate, and therefore the easier it is to apply water.

The advantage of the presence of a substance having a hydrophilic group on the liner film side in the three-layer foam sheet is as follows.
In addition to the difference in the thickness of the film described above, there is also a reason that the ratio of the area of the contactable portion to the entire area of the three-layer cellular sheet is different. The back film and the liner film of the three-layer foam sheet are not flat, but have excursions as shown in FIG. In FIG. 6, the three-layer foam sheet (3) is composed of a cap film (31), a back film (32) and a liner film (33).

Since the film enters and exits as described above, when the three-layer foam sheet is adhered to the glass plate with water, it is not the entire surface that is useful for the adhesion, but the cross section shows A in FIG. 7 (liner attachment). In FIG. 8A (back-attached), as indicated by the hatched portion in FIG. 7B and FIG. 8B in the portion where water (W) exists between the glass plate (G) and the glass plate (G). Only the protruding part. In general, in the bubble sheet, as can be seen from the comparison between the figures, the proportion occupied by the cap portion is larger than the proportion occupied by the non-cap portion. Specifically, in a foam sheet with a standard cap, as used in the examples below, the former is 70%
Occupy close, the latter stopping more than 30%. Therefore, "liner application", in which the top of the cap is applied, is more advantageous than "back application" in that more stable water application can be performed.

[0029]

EXAMPLE A pellet of modified polyethylene having a hydrophilic group obtained by graft polymerization of acrylic acid onto polyethylene was mixed with a low-density polyethylene (density: 0.93, MI: 3 g).
/ 10 min) in a weight ratio of 70:30. This hydrophilic substance-kneaded polyethylene was used for a liner film, and only the low-density polyethylene described above was used for a cap film and a back film. Liner film thickness: 15 μm Cap film thickness: 25 μm Back film thickness: 20 μm Cap: 10 mm diameter, 4 mm height, 11.5 mm pitch, staggered area ratio 70%

The three-layer foam sheet is 0.9 m in size.
The sheet was cut into a size of a window glass of × 0.9 m and attached with water. During the three months in winter, the foam sheet was in close contact with the window glass and served as window insulation, saving heating costs. After use, it could be easily peeled off.

[0031]

According to the present invention, the water-applicable plastic film can be adhered by applying water to a flat glass plate and pressing the film on the flat glass plate. Even if there is a close contact state, and
"Water-laden" that easily peels off with a little force
It is possible. That is, since it can be applied to a glass plate such as a window glass without an adhesive, there is no fear that traces of the adhesive remain after peeling off the appearance, and there is no need to remove the remaining adhesive.

By using polyolefin as a material, the plastic film can be folded and distributed and sold, so that it is convenient without being bulky.

The above-mentioned advantages are particularly useful when the water-peelable plastic foam sheet, which is a special aspect of the present invention, is applied to a window glass only in winter as a heat insulating material in cold regions.

[Brief description of the drawings]

FIG. 1 is a view for explaining the water-adhering film of the present invention on a glass plate, wherein A is a plan view immediately after adhering to water, B is an enlarged cross-sectional view of A, and C is water. B after drying
Sectional drawing corresponding to FIG.

FIG. 2 is a conceptually enlarged cross-sectional view for explaining adhesion between a plastic film and a glass plate in the state of FIG. 1C.

FIG. 3 is an enlarged cross-sectional view showing a modified form of the film that can be applied with water, according to a modified embodiment of the present invention.

FIG. 4 is a plan view showing the structure of an example of the water-attachable plastic heat-insulating sheet of the present invention, which is partially cut away to show the inside.

FIG. 5 is a cross-sectional view showing a state where the heat insulating sheet of FIG. 4 is attached to a glass plate with water.

FIG. 6 is an enlarged cross-sectional view exaggerating the shape of each film constituting the foam sheet when the water-applicable plastic foam sheet of the present invention is a three-layer foam sheet.

7 is a view conceptually showing a contact surface (shaded portion) when the liner film of the three-layered bubble sheet of FIG. 6 is in contact with a glass plate and water-bonded, wherein A is an enlarged cross-sectional view, and B is Plan view.

8 is a close contact surface (shaded portion) when the back film of the three-layer foam sheet of FIG.
FIG. 8 is a view corresponding to FIG. 7 conceptually showing FIG. 7, where A is an enlarged sectional view and B is a plan view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Film which can be stuck in water 11 One side (thin side) 12 The other side (thick side) 2 Insulation sheet which can be stuck in water 21 Cap film 23 Liner film 24 Air chamber 3 Three-layer bubble sheet 31 Cap film 32 Back film 33 Liner film G Glass plate W Water

[Procedure amendment]

[Submission date] June 26, 2000 (2006.2.
6)

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──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) C08L 23/26 C08L 23/26 F term (Reference) 4F071 AA14 AA15 AA18 AA82 AA88 AC10 AH03 BC01 CA07 CA08 CD07 4F100 AG00B AH02A AH02D AK03A AK03D AK70A AK70D AL04A AL04D AL05A AL05D BA02 BA03 BA04 BA07 BA10A BA10B BA10D CA07A CA07D DD07A DD07D DD12C GB08 JJ02 JN01 4J002 BB031 BB082 BB212 EH046 GL00

Claims (10)

[Claims] 1. A plastic film which can be water-adhered to a glass plate, obtained by kneading a polyolefin resin with a substance having a hydrophilic group which is compatible with the polyolefin resin to form a film or sheet. 2. The film according to claim 1, wherein the substance having a hydrophilic group is a polymer obtained by graft-polymerizing acrylic acid and / or maleic anhydride onto a polyolefin. 3. The film according to claim 1, wherein the substance having a hydrophilic group is a mono- or diglycerin fatty acid ester. 4. The film according to claim 1, further comprising an ultraviolet absorber. 5. The film according to claim 1, wherein the transparency is adjusted by providing fine irregularities on the side not in contact with the glass plate. 6. A plastic heat insulating sheet comprising a cap film having a large number of dents formed by vacuum forming of a plastic film, and a flat liner film bonded to the top of the cap film. A heat insulating sheet kneaded with a substance having the following and can be attached to a glass plate with water. 7. A two-layer foam sheet comprising a cap film having a large number of depressions formed by vacuum molding of a plastic film and a flat back film attached to the bottom surface of the cap film to provide a large number of independent air chambers. A plastic foam sheet in which at least one film is kneaded with a substance having a hydrophilic group and is water-adherable to a glass plate. 8. A number of independent air chambers are provided by bonding a flat back film to the bottom surface of a cap film provided with a number of depressions by vacuum forming of a plastic film, and the top of the cap of the cap film is formed. This is a three-layer foam sheet in which a flat liner film is continuously laminated, and at least one of a back film and a liner film is kneaded with a substance having a hydrophilic group, and is made of plastic which can be water-pasted on a glass plate. Bubble sheet. 9. The three-layer foam sheet according to claim 8, wherein the liner film is thinner than the back film, and a material having a hydrophilic group is kneaded in the liner film. 10. A film having a gradient in which at least the thickness of a water-adherable film to be attached to a glass plate gradually changes from one side of the film, the heat insulating sheet or the bubble sheet toward the other side opposite to the one side. The plastic film, heat insulating sheet or bubble sheet according to any one of claims 1 to 9, wherein the plastic sheet, the heat insulating sheet or the foam sheet according to any one of claims 1 to 9, is configured such that water is applied to a glass plate with the thin side on the upper side and the thick side on the lower side.