JPH05331436A - Double-sided tacky tape - Google Patents

Abstract

PURPOSE:To obtain an inexpensive double-sided tacky tape having enhanced heat resistance without impairing the flexibility of a substrate. CONSTITUTION:The objective double-sided tacky tape is obtained by forming a tacky agent layer composed of an acrylic tacky agent having >=100 deg.C heat- resistant holding power on both surfaces of a nonwoven fabric substrate consisting essentially of a polyester.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided pressure-sensitive adhesive tape, and more particularly to a double-sided pressure-sensitive adhesive tape suitable for heat-resistant applications, in which the heat resistance of a non-woven fabric substrate and a pressure-sensitive adhesive layer is enhanced.

[0002]

2. Description of the Related Art Conventionally, as a double-sided pressure-sensitive adhesive tape, one in which a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive is laminated on both surfaces of a non-woven fabric substrate made of rayon and / or pulp has been widely used. On the other hand, the double-sided pressure-sensitive adhesive tape is used for various purposes, but in some cases, it may be used in a high temperature atmosphere exceeding 100 ° C. In the double-sided pressure-sensitive adhesive tape used under such a high temperature environment, a pressure-sensitive adhesive having excellent heat resistance is used as a pressure-sensitive adhesive forming the pressure-sensitive adhesive layer.

However, in the conventional double-sided pressure-sensitive adhesive tape, since the base material is composed of a non-woven fabric base material made of rayon and / or pulp, 120 ° C. to 140 ° C.
If left in an atmosphere of a certain degree, carbonization of the base material proceeds,
There is a problem that the strength of the base material is significantly reduced. Therefore, as a double-sided pressure-sensitive adhesive tape suitable for heat-resistant use, one using a substrate made of glass fiber has been proposed. However, when a base material made of a glass base material is used, there is a problem that the thickness of the base material is increased, flexibility is lowered, and cost is very high. Therefore, the double-sided pressure-sensitive adhesive tape using glass fiber as a base material is excellent in heat resistance, but its use is significantly limited.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a double-sided pressure-sensitive adhesive tape having excellent heat resistance, which can be supplied at low cost without impairing the flexibility of the substrate.

[0005]

Means for Solving the Problems The inventors of the present application have made earnest studies to achieve the above object, and as a result, found that the above object can be achieved by using a non-woven fabric substrate containing polyester as a main component. The present invention has been accomplished. However, the double-sided pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive comprising a non-woven fabric base material containing polyester as a main component and an acrylic pressure-sensitive adhesive formed on both sides of the non-woven fabric base material and having a heat resistance holding power of 100 ° C. or more. And a layer.

Nonwoven Fabric Substrate As described above, in the present invention, a nonwoven fabric substrate containing polyester as a main component is used. The reason why the non-woven fabric base material containing polyester as the main component is used is to increase heat resistance, and the use of the non-woven fabric base material containing polyester as the main component lowers the mechanical strength in a high temperature atmosphere exceeding 100 ° C. Can be prevented. The non-woven fabric substrate containing polyester as the main component that can be used may be made of only polyester, or may contain rayon, pulp, vinylon or the like as an accessory component in addition to polyester. However, in order to exert sufficient heat resistance, the polyester content must be 50% by weight or more. The non-woven fabric base material containing polyester as a main component is preferably 8 to
A grammage of about 24 g / cm ² is used.

Pressure-sensitive adhesive layer In the double-sided pressure-sensitive adhesive tape of the present invention, the pressure-sensitive adhesive layer is composed of an acrylic pressure-sensitive adhesive having a heat-resistant holding power of 100 ° C. or higher. Here, this heat-resistant holding power means JIS Z0237.
After crimping the test piece to the test plate in the same manner as above (bonding area 20 mm x
20mm), 60 in a hot air circulation type constant temperature box of 100 ± 2 ℃
After being left for a minute, a load of 1000 ± 10 g was applied at the same temperature, and after 24 hours, the load was removed and the displaced distance was measured. In the heat resistance holding test, a high cohesion with no exudation of glue of 1 mm or more. A force adhesive is used.

[0008]

The non-woven fabric containing polyester as the main component has excellent heat resistance as described above, and does not cause carbonization or the like even when placed in an atmosphere exceeding 100 ° C., and also has a reduced mechanical strength. Hard to happen. Further, the non-woven fabric substrate containing polyester as a main component is also superior in flexibility as compared with the non-woven fabric substrate made of glass fiber. In the double-sided pressure-sensitive adhesive tape of the present invention, a pressure-sensitive adhesive layer having a heat-resistant holding power of 100 ° C. or higher is formed on both sides of the above-mentioned nonwoven fabric base material mainly composed of polyester having excellent heat resistance and flexibility.
Even if it is placed in an atmosphere exceeding 00 ° C, or used in an atmosphere exceeding 100 ° C, and the load is applied in either the vertical direction or the horizontal direction, it is possible to fully exhibit the characteristics of the adhesive. In addition, the adhesive strength is less likely to decrease.

[0009]

EXAMPLES The present invention will be clarified by giving Examples and Comparative Examples of the present invention. Example A polyester non-woven fabric having a thickness of 40 μm (manufactured by Hirose Paper Co., Ltd., trade name: O5TH-12) was prepared as a non-woven fabric substrate.
Ball tack of this non-woven fabric base material, SP adhesion and JIS
Holding power (value measured based on JIS Z0237)
Is as shown in Table 1 below.

Heat-resistant acrylic pressure-sensitive adhesive [manufactured by Soken Chemical Industry Co., Ltd., trade name: SK Dyne 1386, JIS Z0237 and the test piece after pressure bonding to the test plate (however, the bonding area is 20 mm ×
20 mm), a load is applied at an arbitrary temperature, and a shift value after 24 hours shows a shift value within 1.0 mm. Heat-resistant holding power at maximum temperature = 160 ° C.] is cast on a release paper to a thickness of 65 μm. Dried in a gear oven for 3 minutes at a temperature of 80 ° C. The above-mentioned non-woven fabric substrate was attached to the pressure-sensitive adhesive film obtained by drying as described above at a linear pressure of about 0.5 kg / cm, and the same dried adhesive was applied to the opposite surface of the non-woven fabric substrate. A double-sided tape was produced by bonding the agent films. Then, the double-sided pressure-sensitive adhesive tape is left for 1 week in an environment of 23 ° C. and 65% relative humidity,
It was used as a measurement sample.

Comparative Example 1 A double-sided pressure-sensitive adhesive tape was prepared in the same manner as in Example except that a rayon nonwoven fabric having a thickness of 45 μm (manufactured by Nippon Paper Industries Co., Ltd., trade name: SPC # 14) was used as the nonwoven fabric substrate. Made,
A measurement sample was prepared in the same manner as in the example. In Table 1 below, the ball tack of the rayon nonwoven fabric,
The SP adhesive strength and JIS holding power are shown.

Comparative Example 2 A double-sided pressure-sensitive adhesive tape was prepared in the same manner as in Example except that a 44-μm-thick Manila hemp nonwoven fabric (manufactured by Nippon Paper Industries Co., Ltd., trade name: F base paper) was used as the nonwoven fabric substrate. Then, a measurement sample was prepared in the same manner as in the example. In addition, the ball tack of the Manila hemp nonwoven fabric, SP adhesive strength and JIS
The holding power is as shown in Table 1 below.

Evaluation The holding power at 120 ° C. and the holding power at 140 ° C. of the measurement samples of Examples and Comparative Examples 1 and 2 obtained as described above were measured in the following manner. 120 ° C holding power: According to JIS Z0237, the bonded area was 20 mm x 20 mm, the weight load was 1 kg, and the displaced distance of the bonded part was measured after leaving the bonded part at 120 ° C for 24 hours. 140 ° C. holding power ... Same as 120 ° C. holding power, but evaluated by measuring the deviation of the area of the bonded portion after 140 ° C. × 24 hours.

Table 1 below shows the measurement results of the above 120 ° C. holding power and 140 ° C. holding power. In addition, after leaving each measurement sample obtained in Examples and Comparative Examples 1 and 2 at 120 ° C. for 1 week and after leaving at 140 ° C. for 1 week,
The T-type peeling force was measured and the color tone was observed in the following manner. The results are also shown in Table 1 below. T-type peeling force: An aluminum plate with a thickness of 0.3 mm × 20 mm × 100 mm is attached with a double-sided adhesive tape,
After leaving for 1 week at ℃ or 140 ℃, JIS
The T-peel strength was measured according to K 6854.

[0015]

[Table 1]

The ball tack, SP adhesive strength and JIS holding power of the non-woven fabric base material in Table 1 are respectively JI
It was measured by S Z0237. As is clear from Table 1, in the double-sided adhesive tapes of Comparative Examples 1 and 2,
After being left at 120 ° C and 140 ° C for 1 week, respectively, the color tone of the base material changed to brown and the T-type peeling force was decreased, and the anchor was broken (indicated by AC in Table 1) especially after being left at 140 ° C for 1 week. It can be seen that On the other hand, the double-sided pressure-sensitive adhesive tape of the example has a temperature of 120 ° C. and 1
Even after being left at any temperature of 40 ° C. for 1 week, only a slight yellowing was observed, and the T-type peeling force was hardly reduced.

[0017]

As described above, in the present invention, since the non-woven fabric base material containing polyester as the main component is used, the heat resistance can be enhanced without impairing the flexibility of the base material. In addition, since the pressure-sensitive adhesive layer is composed of an acrylic pressure-sensitive adhesive having a heat-resistant holding power of 100 ° C. or more on both surfaces of the non-woven fabric substrate having the improved heat resistance as described above, the pressure-sensitive adhesive force in a high temperature environment, particularly T type The peeling force is remarkably enhanced as compared with the conventional double-sided pressure-sensitive adhesive tape using a non-woven fabric substrate made of rayon, linen or the like.

Further, when a non-woven fabric made of only polyester is used, it does not contain a binder resin, so that the impregnating property of the pressure-sensitive adhesive is good. Therefore, when the double-sided pressure-sensitive adhesive tape is constituted, the base material and the pressure-sensitive adhesive are used. The adhesion strength between the layers can be increased. Similarly, since the pressure-sensitive adhesive has an excellent impregnating property, it is possible to provide a double-sided pressure-sensitive adhesive tape having excellent suitability for various punching processes.

Claims (1)

[Claims] 1. A non-woven fabric substrate comprising polyester as a main component, and a pressure-sensitive adhesive layer laminated on both sides of the non-woven fabric substrate and made of an acrylic pressure-sensitive adhesive having a heat-resistant holding power of 100 ° C. or more. A double-sided adhesive tape characterized by.