JPH0730660Y2 - Adhesive sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a tacky adhesive sheet that is attached to the inner surface of a cooking device such as an oven grill or a microwave oven and exhibits a self-cleaning function.

(Prior art) The self-cleaning function changes the oil and fat that scatter when baking meat or fish in a cooking device such as an oven grill into steam and carbon dioxide by catalytically oxidizing and burning it without producing a flame. This is a function, and this catalytic reaction usually occurs at about 150 to 200 ° C, although it varies somewhat depending on the oil and fat content.

As a method of imparting such a self-cleaning function to the inner surface of the cooker, for example, a self-cleaning paint in which a catalyst powder and a porosifying material are dispersed in an inorganic heat-resistant paint is baked on the inner surface of the cooker. A method of forming a self-cleaning film (Japanese Patent Laid-Open No. 57-676676) is known.

(Problems to be Solved by the Invention) However, the work of baking and coating the self-cleaning paint to form the self-cleaning coating as described above is more troublesome than the simple coating and pasting work.
Further, when a self-cleaning film is formed by baking coating, undecomposed oil and fat remains on the surface of the self-cleaning film due to the generation of a large amount of oil and fat, and the self-cleaning function deteriorates, or the catalyst is poisoned by long-term use ( If it deteriorates and the self-cleaning function deteriorates, you have to ask a specialist such as a manufacturer to repair it, remove the old self-cleaning film by polishing, and form a new self-cleaning film by baking again. There was a problem that the repair was time-consuming and the repair cost was high.

The present invention has been made in view of the above circumstances, and can be provided with a self-cleaning function only by attaching it to the inner surface of a cooking device or the like, and the convenient adhesive property that can be easily and inexpensively repaired. The purpose is to provide a sheet.

(Means for Solving the Problems) The tacky-adhesive sheet of the present invention is a laminated sheet having two or more layers, the surface layer of which has a thermal deformation temperature in which a fat and oil decomposition catalyst and an oxidation catalyst are dispersed. The self-cleaning layer is made of a heat-resistant thermoplastic resin having a temperature of 150 ° C. or higher, and is characterized in that the back surface layer is an adhesive layer, thereby achieving the above object.

The term "sheet" as used herein means a broad concept including from a relatively thick flat plate to a thin film.

FIG. 1 shows a cross-sectional view of the tacky-adhesive sheet according to the present invention.
It has a two-layer structure in which a self-cleaning layer 1 made of a heat-resistant thermoplastic resin of 150 ° C. or higher and an adhesive layer 2 as a surface layer are laminated.

The self-cleaning layer 1 is a layer in which a decomposition catalyst of oil and fat and an oxidation catalyst are uniformly dispersed in a heat-resistant thermoplastic resin,
As heat-resistant thermoplastic resin, heat distortion temperature (HDT: 18.5kg
/ cm ² ) of 150 ℃ or higher polyether imide, polyether sulfone (PES), polyether ether ketone (P
Heat-resistant thermoplastic resins such as EEK) and polyphenylene sulfide (PPS) are used. As the above decomposition catalyst,
A catalyst that cleaves molecules of higher hydrocarbons of C _{15 to} C ₂₀ that are oils and fats into hydrocarbons of low molecular weight of about C _{3 to} C ₆ , such as γ-MnO ₂ , KMnO ₄ , Zn-Mn ferrite Inorganic powders such as, or fatty acid salts such as manganese stearate, chromium stearate, and potassium stearate are used. The above-mentioned oxidation catalyst is a catalyst that oxidizes (burns) molecularly cut low-molecular weight hydrocarbons into water and carbon dioxide gas, for example, α-Al ₂ O ₃ , silica-alumina, activated clay, silica-magnesia. Inorganic powders such as cation exchange type Y type zeolite and proton type zeolite are used.
The blending amount of these catalysts varies slightly depending on the particle size and dispersion state of the catalyst.
If the content is about 5%, a sufficient self-cleaning function can be exhibited.

The thickness of the self-cleaning layer 1 is not particularly limited, but in the case of obtaining a flexible film-like tacky adhesive sheet, the thickness of the self-cleaning layer 1 is 10 μm to
It is preferably 100 μm. In some cases,
The self-cleaning layer 1 may be colored by adding a coloring agent or may be patterned.

The adhesive layer 2 on the back surface is a layer made of an adhesive or a pressure-sensitive adhesive,
For example, EVA hot melt adhesive, SIS hot melt adhesive, acrylic hot melt adhesive, unsaturated polyester uncrosslinked material, acrylic adhesive, rubber adhesive, silicone adhesive, urethane adhesive, Post-curable acrylic pressure-sensitive adhesives, blends or laminates of these are used, and in consideration of heat resistance during use, it is preferable to use the above adhesives and post-curable pressure-sensitive adhesives. Also,
If necessary, a release sheet (not shown) or the like may be further laminated on the lower side of the adhesive layer 2 to cover the adhesive layer 2 so as not to be exposed.

FIG. 2 shows another example of the tacky-adhesive sheet of the present invention. This tacky-adhesive sheet comprises a heat-resistant self-cleaning layer 1 as a surface layer and an adhesive layer 2 as a back layer. Has a three-layer structure in which the intermediate layers 3 are laminated and integrated.

The intermediate layer 3 functions as a core material that gives strength to the adhesive sheet, and is a thermosetting resin such as a phenol resin, an imide resin, or a melamine resin having a heat distortion temperature of 150 ° C. or higher, or Liquid crystal resins, heat-resistant thermoplastic resins such as polyetherimide, polyether sulfone, polyether ether ketone, and polyphenylene sulfide, sheets of stainless steel, aluminum, glass, enamel, and ceramics are used. When such an intermediate layer 3 is present, the self-cleaning layer 1 can be thinned. The self-cleaning layer 1 and the adhesive layer 2 are the same as those in FIG.

The adhesive sheet as described above is manufactured by various methods. For example, in the case of the adhesive sheet shown in FIG. 1, self-cleaning is performed by means of extrusion molding, casting, reaction molding or the like using the above heat-resistant plastic resin composition in which a decomposition catalyst and an oxidation catalyst are dispersed. A sheet is prepared and the adhesive or pressure-sensitive adhesive is directly applied to the back surface of the sheet to laminate the adhesive layer 2, or an adhesive layer formed on the self-cleaning sheet and the release sheet, etc. It is manufactured by laminating 2 and 2 by a means such as dry lamination. In the case of the adhesive sheet shown in FIG. 2, the above self-cleaning sheet is laminated on the surface of a sheet of metal, glass, ceramics or the like which will be the intermediate layer 3 by means of dry lamination or the like,
It is manufactured by laminating the adhesive layer 2 on the back surface in the same manner as described above.

The self-adhesive sheet of the present invention as described above can be easily attached by simply adhering the adhesive layer 2 on the back surface to the inner surface of a cooking device or the like. There is no such a hassle. In this way, when you cook meat, fish, etc. with a cooker with an adhesive sheet attached,
The scattered oils and fats come into contact with the decomposition catalyst of the self-cleaning layer 1 on the surface of the adhesive sheet to decompose into low molecular weight hydrocarbons, and the hydrocarbons come into contact with the oxidation catalyst of the self-cleaning layer 1 to oxidize (combustion). ), It becomes vapor and carbon dioxide, and volatilizes into the air. Therefore, except in special cases where a large amount of fats and oils are generated at one time, undecomposed fats and oils do not remain on the surface of the tacky adhesive sheet, so the cooker can be used until the catalyst deteriorates due to long-term use. The inner surface of the can be kept beautiful without oil stains.

If the self-cleaning function deteriorates due to deterioration of the catalyst, peel off the old adhesive / adhesive sheet and replace it with a new adhesive / adhesive sheet, or use a new adhesive / adhesive sheet over the old adhesive / adhesive sheet. It can be easily repaired just by sticking it on. Similarly, even if the function of the self-cleaning coating due to baking coating deteriorates, it can be repaired simply by sticking a tacky adhesive sheet on the coating. . Therefore, it is not necessary for a specialist to polish and remove the old self-cleaning film and to form the self-cleaning film by baking again, so that the labor and cost required for the repair work can be greatly saved.

(Example) Next, this invention is demonstrated based on an Example.

Example Polyetherimide (Engineering Plastic Co., Ltd., Ultem 1000, heat distortion temperature 200 ° C.) 15 g was dissolved in chloroform 100 ml, and α-alumina (Nippon Shokubai Chemical Co., Ltd., average particle size 5 μm) 0.3 g And 0.3 g of KMnO ₄ (manufactured by Wako Pure Chemical Industries, Ltd., special grade) are forcibly stirred and dispersed by a resolver, and a 38 μm thick release polyethylene terephthalate sheet (manufactured by Soken Kako Co., Ltd.) , 38
11) Cast at 70 ℃ for 10 minutes, then 150 ℃
10 minutes and further dried at 200 ° C. for 2 minutes to obtain a self-cleaning sheet having a thickness of 120 μm. On the other hand, an EVA adhesive (Takemelt XM223 manufactured by Takeda Yakuhin Co., Ltd.) was calender extruded to a thickness of 30 μm on a release sheet subjected to a silicone release treatment to laminate an adhesive layer. Then, the release sheet laminated with the adhesive layer and the self-cleaning sheet were heat-laminated at 150 ° C. to obtain a viscous adhesive sheet.

Then, the release sheet covering the adhesive layer of the tacky adhesive sheet was peeled off, the adhesive layer was heated to 60 ° C. and attached to the inner surface of the microwave oven, and then the temperature in the oven was raised to 200 ° C. The adhesive sheet was completely bonded. In order to evaluate the self-cleaning performance of this pressure-sensitive adhesive sheet, linoleic acid was thinly applied to the surface of the sheet to a thickness of about 1 to 5 μm, the temperature inside the oven was set to 250 ° C., and the surface after 10 minutes was visually observed.
As a result, almost no linoleic acid was confirmed, and it was found that the linoleic acid had excellent self-cleaning performance.

(Effects of the Invention) The adhesive sheet of the present invention can be easily attached by simply adhering the adhesive layer on the back surface of the sheet to the inner surface of the cooking device, etc. Since it has an excellent self-cleaning function, it does not cause oil stains, and if the self-cleaning function deteriorates due to long-term use, it can be repaired easily and inexpensively simply by replacing or sticking a new adhesive sheet. There is an effect that can be performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the tacky-adhesive sheet of the present invention, and FIG. 2 is a cross-sectional view showing another embodiment of the tacky-adhesive sheet of the present invention. 1 ... self-cleaning layer, 2 ... adhesive layer, 3 ... intermediate layer.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area C09J 7/02 JLE // C09D 5/00 PSF

Claims (1)

[Scope of utility model registration request] 1. A self-cleaning layer comprising a laminated sheet of two or more layers, the surface layer of which is composed of a heat-resistant thermoplastic resin having a heat distortion temperature of 150 ° C. or higher, in which a decomposition catalyst for oil and fat and an oxidation catalyst are dispersed. And the backside layer is an adhesive layer.