JPS60137639A - Non-fogging film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an i-fog film used for defogging automobile window glass, the 21st stop of a bell for bathing or washing, or defogging ski goggles, etc. be.

(Prior art) Defogging car windows and mirrors obstructs visibility due to fogging, reducing reflective performance.
Improvement'l! L balls are highly desired.

By the way, there are many ways to improve the anti-fogging performance, and one of them is the method shown in Japanese Patent Application Laid-Open No. 5'6-7'643'4. □There is a method of making the surface of acetate-based plastic hydrophilic with an alkaline solution.Although this method can achieve an antifogging effect, the treatment with an alkaline solution8, washing with water, and drying steps are complicated. (However, there was a problem that the cost was high, and that this treatment lowered transparency and strength.

Another method is to perform antifogging treatment by spraying a certain type of surfactant, but this method has the disadvantage that the antifogging effect cannot be maintained over a long period of time. Furthermore, as another method, a method of adhering an antifogging film such as Seronon to a base material is also known. In this case, it is conceivable to firmly adhere the antifogging film, but if the durability of these antifogging films is taken into consideration when replacing the film, it is preferable to adhere the antifogging film to such an extent that it can be easily peeled off. Car windows and mirrors are frequently wiped during use, so after a long period of time, parts of the window glass and mirrors are likely to become contaminated or damaged, so please consider replacing them (if necessary). There is.

By the way, adhesives are used to adhere the anti-fog film to a degree that allows it to be reapplied, but since the anti-fog film is generally hydrophilic and expands and contracts when it absorbs water, the periphery does not peel off. It has the disadvantage of causing curling.

(Objective of the Invention) In view of these problems, the present invention provides an easy-to-manufacture anti-fog film with excellent anti-fog effects that does not peel off even when adhesively bonded to the extent that it can be replaced. The present invention has been made to achieve the above object,
The gist thereof is an anti-fog film characterized by having a transparent external line aqueous film as a base material, with an anti-fog film adhered to one significant side and a hydrophilic film adhered to the other side.

The present invention will be described below with reference to drawings of embodiments.

In the figure, (1) is a transparent hydrophobic film serving as a base material in the present invention, and a transparent thermoplastic film such as polyester or acrylic having a thickness of about 12 to 50 μm is used. Also, (2) is an anti-fog film that is adhered to the significant surface of this hydrophobic film (1)! This anti-fogging film (2) is made of a film obtained by hydrophilizing a cellulose-based film such as cellophane or acetyl cellulose, or a vinylon film, which is about the same or slightly thinner than the hydrophobic film (1). It will be done.

By the way, this anti-fog film (2) is made with an adhesive (
4), and is used by adhering it to an object to be bonded (6) such as a window glass or mirror with an adhesive (5) in the state shown in the figure, but the anti-fog film (2) is Since they are generally hydrophilic, they expand and contract due to water absorption. The adhesive force (5) cannot be made too strong when reapplying it, so the anti-fog film (2) cannot be made too strong.
) cannot be stopped from expanding and contracting, and as a result, a phenomenon occurs in which the peripheral edges in particular peel off and curl. Therefore, in the present invention, an anti-fog film (2) is provided on the opposite side to the significant side.
It is characterized by adhering a hydrophilic film (3) having the same level of hydrophilicity as the hydrophobic film (1) and balancing the degree of water absorption on both sides of the hydrophobic film (1). As this hydrophilic film, a cellulose film such as cellophane or a vinylon film having the same thickness as the above-mentioned anti-fog film (2) can be used. This is particularly preferred. In addition,
Although it is possible to directly bond an antifogging film such as cellophane to the object to be bonded (6), there is a problem in that cellophane alone tends to wrinkle and cannot be bonded smoothly.

An adhesive (4) for bonding an antifogging film (2) and a hydrophilic film (3) to a hydrophobic film (1).

(The four materials are not particularly limited as long as they can be bonded together.Also, the adhesive (5)
You can use any standard adhesive, but it is best to choose the strength of the adhesive with consideration for repositioning.

(Examples) Example 1 Cellophane with a thickness of 20 μm was adhered to both sides of a transparent polyester film with a thickness of 25 μm. As the adhesive at this time, a polyester adhesive containing 5 to 15% of incyanate auxiliary agent was used, and O was bonded between rollers at a temperature of 130°C. One side of the antifogging film obtained in this way An acrylic adhesive was applied to the surface, and a release paper was added to create the finished product.

When the antifogging film obtained as described above was peeled off from the release paper and adhered to a mirror as shown in Figure 1, it was easily adhered, and even after repeated water absorption and drying, the periphery did not peel off. (And it also had an excellent anti-fog effect.

Example 2 A film with a thickness of 20 μm was applied to the significant surface of an acrylic film with a thickness of 25 μm.
A 14 μm thick vinylon film was adhered to the other side using the same acrylic adhesive.

When the antifogging film thus obtained was adhered to a mirror by applying an adhesive to the surface on the vinylon film side, the film had excellent adhesion as in Example 1.

(Effects of the Invention) Since the present invention has the structure as described in detail above, it has excellent antifogging properties and durability.

It also has the advantage of providing an excellent anti-fogging film that has a good balance due to water absorption, does not wrinkle due to expansion and contraction, and does not peel off when adhered to window glass or the like.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view showing an embodiment of the antifogging film of the present invention.

Claims (1)

[Scope of Claims] 1. An anti-fog film comprising a transparent hydrophobic film as a base material, an anti-fog film adhered to one significant side, and a hydrophilic film adhered to the other side. 2. The antifogging film according to claim 1, wherein an adhesive layer is formed on the surface of the hydrophilic film. 3. The anti-fog film according to claim 1 or 2, characterized in that cellophane is used as the anti-fog film. 4. Claims 1, 2, or 3, characterized in that cellophane is used as the hydrophilic film.
The auxiliary film described in the section. The antifogging film according to claim 1, 2, or 3, characterized in that a vinylon film is used as the aqueous film. 6. The invention is characterized in that a polyester film is used as the hydrophobic film. cloudy film.