JPS6035418A - Insulating adhesive sheet - 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 The present invention relates to an insulating adhesive sheet, which is used for fixing a plate in a thin home appliance, such as a calculator.

For thin home appliances, as shown in Fig. 1, a plate cover (made of metal) 3゛ is adhered to a resin molded body having electrical component storage holes 1', . There are things to do. The purpose of using the adhesive 4° of this sheet 1-1 is to fix the plate cover 3° to the electronic component 5' and the plate cover 3' to ensure complete electrical insulation between the electronic component 5' and the plate cover 3'. 42' and 42' are used.

This sheet-like adhesive 4' is usually stored and transported in a roll-wound state, and a separator 4 is used to prevent blocking between the adhesive layers that come into contact with each other due to the roll-winding.
3' is provided.

By the way, in Figure 1, the insulating film in the area other than the hole for storing electronic components has no use for the above-mentioned insulation (insulation between the electronic components and the plate cover), and on the contrary, it makes the product thinner. It is disadvantageous for molding (in ultra-thin design, the thickness of the insulating film also becomes a problem). Furthermore, the separator is completely discarded after being unwound from the roll, which is uneconomical.

The insulating adhesive sheet according to the present invention has a structure that can eliminate the above-mentioned disadvantages, and is adhesive on both sides (in other words, the adhesive layer on at least one side is made non-adhesive or weakly adhesive at room temperature). The present invention is characterized in that a non-adhesive or weakly adhesive adhesive layer of the adhesive sheet is provided with a separating and insulating film.The present invention will be explained below with reference to the drawings.

In FIG. 3, 1 is a double-sided adhesive sheet, and the adhesive layer 11 on at least one side has a non-adhesive or weakly adhesive sheet at room temperature (20 to 5009 according to JIS, Z, 0237).
150 nm) was used. The adhesive layer 12 on the other side can be either non-adhesive (including weakly adhesive) or adhesive at room temperature, and especially in the latter case, the support 12
1 coated and impregnated with adhesive 122 is used. 2
is a film for a separate (to prevent blocking between the adhesive layers 11, 1.2 that come into contact with each other when rolled) temporarily attached to the adhesive layer 11;

- The thickness of the adhesive layers Co-1 and L2 is 0.02 to 0.2 mm in both cases, and the thickness of the film 2 is 0.02 to 0.2 mm.
．． 0] to 0.20 mm, and the volume resistivity of the film is 10 12 Ω-α or more.

Non-adhesive or weakly adhesive adhesives at room temperature (1) include thermoplastic resins such as ethylene-vinyl acetate copolymers, ionomers, polyamides, polyesters, etc., as well as hydrocarbon-based, rosin-based, Blends of resins such as ester rosin, xylene, terpene, phenol, terpene-phenol, etc. Blends of styrene-butadiene block copolymer with coumaron resin, styrene resin, xylene resin, phenol modified resin, etc. You can use the one you made. The softening point of these resins is 800~
It is desirable to adjust the temperature to 160'C. If it is lower than 80'C, it becomes sticky at room temperature, and if it is higher than 16Q'c, a high temperature is required to develop adhesiveness, making it difficult to bond. In the case of the above (■), the blending ratio shall be 100 parts by weight or less per 100 parts by weight of the thermoplastic resin, and in the case of the above (■),
It is desirable that the amount is 10 to 60 parts by weight based on 100 parts by weight of the styrene-butadiene block copolymer. If the amount is more than this, it will become sticky at room temperature and the adhesive properties at high temperature will also deteriorate;
This is because if the amount is less than 10 parts by weight, the adhesive strength will be significantly reduced. In order to improve non-stick properties at room temperature, an anti-blocking agent such as wax or fatty acid amide may be added in an amount of 10 parts by weight or less. If more than 10 parts by weight is added, the adhesive strength will be significantly reduced. In addition, anti-aging agents, fillers, stabilizers, pigments, cross-linking agents, etc. can be added as necessary.

When using the adhesive layer 12 that is non-adhesive at room temperature (base material coated with and impregnated with adhesive), base material] 2
For the adhesive 122, rayon, Japanese paper, polyester, polypropylene, etc., with a thickness of 0.01 to Q, or 100 mm, can be used, and for the adhesive 122, acrylic, rubber, or
Adhesives such as silicone-based adhesives, nitrile-based, neoprene-based, ethylene-vinyl acetate-based, and nylon-based adhesives can be used.

The above-mentioned separating and insulating film 2 may be made of polyester, polypropylene, polyethylene, or the like.

The insulating adhesive sheet according to the present invention can be manufactured, for example, as follows.

A dry adhesive (e.g., mVA type) is extruded into a film (thickness: 0.05 mm) using an extruder, and this is used as a support sheet. (You can use Dalasin paper). Separately, apply an adhesive solution (e.g. acrylic) to a non-woven fabric (e.g. polyester, thickness 0.
．． 05), dried, and bonded to the dry adhesive layer on the support sheet using a heated roller. Then,
A 7 l/l/mm (thickness: 05 nm (1') polyester film) for peeling is applied to the dry adhesive layer using a heated roller (e.g., roller temperature +
After that, the support sheet is removed. The insulating adhesive tape thus obtained is stored and transported in a rolled state. In this rolled state, a film is interposed between the adhesive layers, and this film can prevent blocking between the adhesive layers.

FIG. 4 shows a part of the fixing structure of a plate cover in a thin home appliance using the sheet of the present invention.

In FIG. 4, 3 is a resin molded body, with holes 31 for storing electronic components. ..., and these holes 31. ... has electronic components 4. It stores... 5 is a plate cover (made of metal). A is an insulating adhesive sheet according to the present invention, 12 is an adhesive layer (either always sticky or dry), 11 is an adhesive layer that is non-tacky or weakly sticky at room temperature, and 2 is a film. It is. In this film 2-
1- Hole 31 for housing electronic components in the resin molded body.・・・The other parts are removed by sealing process and adhesive layer 1
1 to the flat surface of the resin molded body 3 (by heating or by using a solvent). Thus, the film 2 has holes 31 for storing electronic components. . . . This film 2 reliably electrically insulates the electronic component 4 from the plate 5.

The plate cover fixing structure described above can be assembled in the following manner.

The insulating adhesive sheet according to the present invention is laminated to the plate cover original plate in an adhesive layer, the film L is sealed, unnecessary parts of the film are removed, and then the original plate is punched out in the shape of a plate cover. is brought into contact with the resin molded body, and then the dry adhesive layer exposed by removing the film is fused to the surface of the resin molded body. Alternatively, a sheet with the above-mentioned sealing process and unnecessary portions of the film removed may be rolled up, unrolled to the required length, and laminated onto the original plate for the plate cover. The steps of bringing the removed plate cover into contact with the resin molding, fusing the dry adhesive layer to the resin molding, etc. may be carried out sequentially.

The insulating adhesive sheet according to the present invention has the same structure as F above, and a film is sealed to prevent the adhesive layer from sticking when rolled, and a part of the film is used for insulation. Therefore, the film can be used not only for separation but also for insulation, increasing its utility value. Furthermore, since the adhesive layer for one film is non-adhesive at room temperature, unnecessary parts can be easily removed during the sealing process and handling is also simple.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a known fixing structure of a plate cover, Fig. 2 is an explanatory diagram showing a conventional insulating adhesive sheet, and Fig. 3 is an explanatory diagram showing a conventional insulating adhesive sheet.
The figure is an explanatory diagram showing an insulating adhesive sheet according to the present invention, No. 4
The figure is an explanatory view showing the usage state of the sheet of the present invention. In the figure, 11 is an adhesive layer that is non-adhesive or weakly adhesive at room temperature, 12 is an adhesive layer, and 2 is a separating and insulating film. vHB Su2 Sae73 (fJ

Claims (1)

[Claims] (1) Double-sided adhesive, with the cedar adhesive layer on at least one side being non-adhesive or weakly adhesive at room temperature. Used for separation and insulation in the non-adhesive or weakly adhesive adhesive layer of the adhesive sheet. An insulating adhesive sheet characterized by a peeled film.