JPH0726077B2 - Self-adhesive composition and self-adhesive article - Google Patents

Description

TECHNICAL FIELD The present invention relates to a self-adhesive composition and a self-adhesive article,
In particular, the coating surfaces formed by this self-adhesive composition easily adhere strongly to each other with a slight pressure, but exhibit substantially adhesiveness even when pressed against a surface of many other articles under strong pressure. No self-adhesive composition and self-adhesive article.

[Conventional technology]

Self-adhesive compositions and self-adhesive articles are disclosed in
55-106275, JP-A-60-26077, JP-A-62
The one described in Japanese Unexamined Patent Publication No.-66825 is known.

Explaining the conventional technique described in the above publication, JP-A-55-106275 discloses a self-adhesive adhesive composition containing natural rubber and polystyrene-polyisoprene-polystyrene copolymer as an adhesive component. Is listed.

Further, in JP-A-60-26077, an aqueous solution in which a rubber latex and a water-soluble adhesive are uniformly mixed is applied to the surface of a tape-shaped substrate and dried, and then the dried coating film surface is treated with an antiblocking agent. A self-adhesive tape treated by

Further, in JP-A-62-66825, a plurality of adhesive sheets comprising a support and a pressure-sensitive adhesive layer are laminated, and the main component of the pressure-sensitive adhesive layer is styrene-ethylene-butylene-styrene block copolymer. Laminated mats made of polymers are described.

[Problems to be solved by the invention]

However, the above conventional techniques have the following problems.

That is, the self-adhesive adhesive composition described in JP-A-55-106275 reduces the adhesive force in a state where the self-adhesive force is large, but in any case, the adhesive force is 1 g / 25 mm width or less. However, it may adhere to other articles and damage other articles.

In the present specification, the self-adhesive force means the self-adhesive force measured by the method shown in the following examples, and is the strength when the coated surfaces of the self-adhesive composition of the self-adhesive tape are stuck together.
Further, the adhesive strength means the adhesive strength measured by the method shown in the following examples, and is the strength when applied to a stainless steel plate of SUS304, and the fact that this value is 1 g / 25 mm width or less is applied to a stainless steel plate. It means the case where the tape does not stick to it, or even if it sticks, it peels off when it is bent in the 180 ° direction, or it cannot be measured with Tensilon (less than 1g cannot be measured depending on Tensilon accuracy and measurement conditions and environment).

Further, the self-adhesive tape described in JP-A-60-26077 does not adhere to other articles because the tape itself has no adhesive force, but the self-adhesive force also decreases as a result (about 100).
~ 400g / 18mm) When used as a tying tape, if the material to be bound is bound and the object to be bound is displaced due to some vibration, force will be applied not only in the shear force direction but also in the vertical direction, and it will easily come off. Sometimes.

The laminated mat described in JP-A-62-66825 has a styrene-ethylene-butylene-styrene block copolymer having a styrene content of 14% by weight and an ethylene-butylene rubber layer content of 86% by weight. (SEBS) is used,
Moreover, we manufacture pressure sensitive adhesives for laminated mats without using a tackifier, but if we make a self-adhesive by this method, SEBS itself will become soft and sticky, so the self-adhesive strength will be 570 to 1700g.
Adhesive strength of at least 20g / 25mm width occurs when self-adhesive compounded to make / 25mm width. On the contrary, when the self-adhesive agent is blended so that the adhesive force is 1 g / 25 mm width or less, the self-adhesion force becomes 570 g / 25 mm width or less, and the feature of the present invention that self adheres to each other with a slight pressure is lost. Further, since the cohesive force is small, the adhesion to the base material is lowered, and the self-adhesive is peeled off from the base material during the peeling test.

[Means for solving problems]

As a result of earnest research to solve the above problems, the present inventors have found that self-adhesive compositions and self-adhesives, which do not substantially adhere to other articles, but adhere to each other with a slight pressure. The present invention has been completed by finding a sex article.

That is, the present invention contains a styrene-ethylene-butylene-styrene block copolymer and a tackifier as main components, and the content of the tackifier is 100 parts by weight of styrene-ethylene-butylene-styrene block copolymer. Against 15
A self-adhesive composition, characterized in that
And a styrene-ethylene-butylene-styrene block copolymer and a self-adhesive composition layer mainly composed of a tackifier on at least one surface of the substrate, the adhesive force is 1g / 25mm width or less. And its self-adhesiveness is 570-17
The present invention relates to a self-adhesive article having a width of 00 g / 25 mm.

The styrene-ethylene-butylene-styrene block copolymer (hereinafter abbreviated as SEBS) used in the present invention is a copolymer composed of two phases, a polystyrene end block phase and an ethylene / butylene rubber phase having no double bond. Yes,
A block copolymer having a molecular weight of 7,000 to 20,000 in the styrene portion of SEBS and a molecular weight of 35,000 to 50,000 in the ethylene / butylene rubber phase, with a styrene content of 20-40% by weight and an ethylene / butylene rubber phase content of 60-80%. % Is preferably used. In particular, the styrene content is 30% by weight,
The ethylene / butylene rubber phase content is preferably 70% by weight.

The tackifier used in the present invention has a softening point of 80 ° C.
Or more, preferably at 100 ° C. or higher, polyterpene resins having a molecular weight of 400 to 2,000, terpene phenol resins, alicyclic saturated hydrocarbon resins, C ₅ petroleum resins, C ₉ petroleum resins, rosin resin or the like is used It

The blending ratio of SEBS and a tackifier in the self-adhesive composition of the present invention is such that the tackifier is 15 relative to 100 parts by weight of SEBS.
~ 60 parts by weight. When the tackifier is less than 15 parts by weight, the self-adhesion shearing force is retained but the self-adhesion force becomes small, and as a result, the self-adhesive composition layer is easily peeled off by a vertical peeling force. Also, the tackifier is 60
When it exceeds the weight part, the adhesive strength increases and the adhesiveness to other articles occurs, and its strength increases with the passage of time.

The self-adhesive article of the present invention is obtained by applying the self-adhesive composition as described above on at least one surface of a substrate, and a self-adhesive tape (hereinafter abbreviated as self-adhesive tape),
Used as a self-adhesive sheet.

The self-adhesive composition of the present invention is obtained by preparing SEBS, a tackifier, and if necessary, an antioxidant (for example, the compounds shown in Table 1), which is then added to an aromatic solvent (toluene, xylene, etc.). Dissolve at a solution concentration of 20-40% by weight,
The self-adhesive article of the present invention can be obtained by applying it to the surface of a substrate.

Examples of the base material used for the self-adhesive article of the present invention include polypropylene film, polyethylene film, polypropylene / polyethylene blend (PP / PE = 3/7) film, plastic film such as polyester film, paper, non-woven fabric, cloth and the like. A simple substance or a complex may be used.

The self-adhesive article of the present invention must have an adhesive force of 1 g / 25 mm width or less and a self-adhesive force of 570 to 1700 g / 25 mm width. If the adhesive strength is greater than 1 g / 25 mm width, the coated surface becomes sticky, and the adhesiveness is not preferable because it shows adhesiveness to a site other than the coated surface of the self-adhesive composition. Also, the self-adhesiveness is 57
If the width is less than 0 g / 25 mm, the surfaces coated with the self-adhesive composition may be easily separated from each other, and an article having good self-adhesiveness cannot be obtained. Further, if the self-adhesive force is more than 1700 g / 25 mm width, problems such as tearing may occur when peeling the self-adhesive composition-coated surfaces once adhered again, which is not preferable.

The self-adhesive shearing force of the self-adhesive article of the present invention is preferably 18 kg / 10 × 18 mm or more as measured by the method shown in the following examples.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example 1 A copolymer having a styrene content of 30% by weight as SEBS and a hydrogenated terpene resin as a tackifier were compounded in a weight ratio as shown in Table 2, and further as an antioxidant, Irganox 1010 manufactured by Ciba-Gaigi Co. {Pentaeryth. Lytyl-tetrakis [3-
(3,5-di-t-butyl-4-hydroxyphenyl) propionate]} was mixed with SEBS in an amount of 3% by weight to prepare various self-adhesive compositions.

A 25% by weight toluene solution of the obtained self-adhesive composition was applied to a biaxially oriented polypropylene film having a thickness of 60 μm by a bar coater and dried in an oven (60 ° C., 30 minutes) to give a film thickness of 30.
A self-adhesive tape was obtained with a thickness of ± 5μ.

With respect to the obtained self-adhesive tape, the initial adhesive force, adhesive force, self-adhesive force and self-adhesive shearing force were measured by the following methods under the conditions of 20 ° C. and 65% RH. The results are shown in Table 2.

<Initial adhesion> Measured according to ASTM D 2979. That is, a stainless steel (SUS304) smooth surface cylinder (called a probe) having a diameter of 5 mm was adhered to a surface coated with the self-adhesive composition for 1 second while applying a load of 100 g, and then the probe was moved at a speed of 10 mm per second. The resistance value when peeled off from the coated surface in the vertical direction was measured and used as the initial adhesive strength.

<Adhesiveness> As shown in FIG. 1, the self-adhesive composition-coated surface 2 of the self-adhesive tape 1 having a width of 25 mm is lightly adhered to the stainless steel plate (SUS304) 3, and 1 kg roller 1 reciprocation is performed from the top of the self-adhesive tape 1. After crimping, the play part is folded back 180 ° to the stainless steel plate, and the play part of the stainless steel plate 3 and the self-adhesive tape 1 is sandwiched between the lower chuck 4 and the upper chuck 5, respectively, and
The resistance value when pulled at a peeling speed of 300 mm / min was measured with a tensile tester within seconds, and this was taken as the adhesive strength.

<Self-adhesion> By using the double-sided tape 6 as shown in FIG. 2, the self-adhesive composition coated surface 2 of the self-adhesive tape 1 having a width of 25 mm
After adhering each other to the stainless steel plate (SUS304) 3 with 1kg roller 1 reciprocation from above the pasting tape, the play part is folded back 180 ° to the stainless steel plate, and the play part of the stainless steel plate 3 and the self-adhesive tape 1 is at the bottom. It was sandwiched between the chuck 4 and the upper chuck 5, and the resistance value when pulled at a peeling rate of 300 mm / min by a tensile tester within 20 seconds was measured and used as the self-adhesive force.

<Self-adhesive shearing force> By using the double-sided tape 6 as shown in FIG. 3, the self-adhesive composition-coated surfaces 2 of the self-adhesive tape 1 are bonded together in an area of 10 × 18 mm from the top of the tape 1 kg. Laura 1
After crimping back and forth on the acrylic plate 7, the play parts of the acrylic plate 7 and the self-adhesive tape 1 are sandwiched between the lower chuck 4 and the upper chuck 5, respectively, and within 20 seconds, the shear test is performed at a peeling speed of 100 mm / min by a tensile tester. The resistance value when pulled to was measured as the self-adhesive shearing force.

As shown in Table 2, the product Nos. 2 and 3 of the present invention have an adhesive force of 1 g / 25 m.
Since it has a width of m or less and its self-adhesive force is 570 to 1700 g / 25 mm width, it does not substantially adhere to other articles, but self adheres to each other with a slight pressure.

Example 2 A polypropylene / polyethylene blend (PP / PE = 3/7) having a thickness of 180 μ was prepared using the No. 3 self-adhesive composition shown in Table 2.
A self-adhesive tape was obtained by applying it to a film so that the film thickness after drying was 30 μ to 80 μ.

When the self-adhesive force of the obtained self-adhesive tape was measured under the conditions of 20 ° C and 65% RH, the self-adhesive force tended to increase as the film thickness increased from 30μ to 60μ. Obtained a result that was almost constant.

〔The invention's effect〕

The self-adhesive composition and the self-adhesive article of the present invention have no self-adhesiveness and therefore do not adhere to other articles at all, but have a large self-adhesive force and a self-adhesive shearing force and should be originally possessed by a self-adhesive. It has ideal characteristics.

The self-adhesive composition and the self-adhesive article of the present invention do not adhere to other articles, but since the coated surfaces are extremely excellent in the property of adhering (self-adhesiveness), a binding tape for vegetables, books, etc. In addition, it can also be used for articles that require a higher degree of adhesion selectivity (for example, fastening tape for diapers and the like).

[Brief description of drawings]

FIG. 1 is a diagram showing a method for measuring an adhesive force, FIG. 2 is a diagram showing a method for measuring a self-adhesive force, and FIG. 3 is a diagram showing a method for measuring a self-adhesive shearing force. 1: Self-adhesive tape 2: Self-adhesive composition coated surface 3: Stainless steel plate 4: Lower chuck 5: Upper chuck 6: Double-sided tape 7: Acrylic plate

Claims (4)

[Claims] 1. A styrene-ethylene-butylene-styrene block copolymer and a tackifier as main components, wherein the content of the tackifier is 100 parts by weight of styrene-ethylene-butylene-styrene block copolymer. 15 to 6
A self-adhesive composition, characterized in that it is 0 part by weight. 2. The self-adhesive composition according to claim 1, wherein the styrene-ethylene-butylene-styrene block copolymer has a styrene content of 20 to 40% by weight. 3. A self-adhesive composition layer comprising a styrene-ethylene-butylene-styrene block copolymer and a tackifier as main components is provided on at least one surface of a substrate, and the adhesive force is 1 g. / 25mm width or less, and its self-adhesiveness is 5
A self-adhesive article having a width of 70 to 1700 g / 25 mm. 4. The self-adhesive article according to claim 3, which has a self-adhesive shearing force of 18 kg / 10 × 18 mm or more.