JPH11293209A - Polyvinyl chloride support pressure-sensitive adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a polyvinyl chloride support pressure-sensitive adhesive tape having excellent manual cuttability and reduced in the formation of splitting and the elongation in the longer direction of the tape. SOLUTION: There are provided a polyvinyl chloride support pressure- sensitive adhesive tape composed of a sheety or filmy support made from a composition comprising a resin component containing a vinyl chloride resin and an ethylene/vinyl acetate/vinyl chloride copolymer, a plasticizer, and a filler and a pressure-sensitive adhesive layer formed on either of its surfaces; a tape as described above, wherein the resin component comprises 100 pts.wt. vinyl chloride resin and 1-40 pts.wt. ethylene/vinyl acetate/vinyl chloride copolymer; and a tape as described above wherein 100 pts.wt. vinyl chloride resin is mixed with 35-55 pts.wt. plasticizer and 3-60 pts.wt. filler.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive (PVC) base tape used for electrical insulation, bundling of electric wires, etc., and more particularly to a pressure-sensitive adhesive (PVC) base tape having improved hand-cutting properties.

[0002]

2. Description of the Related Art Conventionally, a PVC-based pressure-sensitive adhesive tape generally used for electrical insulation, electric wire binding, and the like is a PVC-based tape formed from a softened compound obtained by compounding a plasticizer into a vinyl chloride resin. An adhesive layer is provided on one side of the material. When this PVC-based pressure-sensitive adhesive tape is used for electrical insulation, wire bundling, and the like, the cutting in the width direction is usually performed by hand without using a blade such as scissors or a cutter. Generally, the difficulty of cutting by hand in the width direction is referred to as hand cutting property, and the ability to easily cut by hand in the width direction is referred to as good hand cutting property. Good hand-cutting properties are regarded as one of the important properties of the PVC-based pressure-sensitive adhesive tape, and various methods for improving hand-cutting properties have been conventionally studied.

For example, filler particles such as calcium carbonate are added to a PVC base material. According to this, at the time of cutting the PVC-based adhesive tape, the direction in which the force acts with the filler particles as the starting point (that is, the tape width direction)
Cracks are more likely to occur, resulting in easier cutting. However, the PVC-based pressure-sensitive adhesive tape to which the filler particles have been added has a new problem in that tearing in the longitudinal direction of the tape, which is called longitudinal tearing, tends to occur, and the workability is significantly reduced.

[0004] Therefore, in order to improve the hand-cutting property and to prevent longitudinal tearing, an ethylene-vinyl acetate copolymer, an acrylonitrile-butadiene copolymer, a styrene-isoprene-styrene block, in addition to filler particles, are used for a PVC base material. Elastomers such as copolymers or styrene / ethylene / butylene / styrene block copolymers have also been blended. However, the PVC-based pressure-sensitive adhesive tape containing this elastomer tends to elongate in the longitudinal direction of the tape upon cutting, and has a problem that it shrinks after being attached to an adherend and peels off from the adherend.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has excellent hand-cutting properties as compared with the prior art, and suppresses longitudinal tearing and elongation in the longitudinal direction of the tape. An object of the present invention is to provide a PVC-based pressure-sensitive adhesive tape.

[0006]

The object of the present invention is to provide a resin component containing a vinyl chloride resin and an ethylene / vinyl acetate / vinyl chloride copolymer according to the present invention, wherein a plasticizer and a filler are blended. This is achieved by a PVC-based pressure-sensitive adhesive tape, wherein a pressure-sensitive adhesive layer is provided on one surface of a sheet or film-like substrate.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a vinyl chloride-based pressure-sensitive adhesive tape of the present invention will be described in detail. The resin component serving as the PVC base material is based on a vinyl chloride resin and blended with an ethylene / vinyl acetate / vinyl chloride copolymer. Here, when the degree of polymerization of the vinyl chloride resin used is low, the tensile strength and elongation at break of the polyvinyl chloride base material are reduced, while when the degree of polymerization is high, the tensile strength and elongation at break of the polyvinyl chloride base material are increased. In order to improve the hand-cutting property of the PVC-based adhesive tape, it is preferable that its tensile strength and elongation at break are low.However, if the degree of polymerization of the vinyl chloride resin used is too low, the mechanical Strength (tensile strength, tear strength, etc.) cannot be obtained. Therefore, the vinyl chloride resin used in the present invention preferably has a degree of polymerization of about 800 to 1400.

The ethylene / vinyl acetate / vinyl chloride copolymer has an ethylene / vinyl acetate copolymer content of 3
It is preferably from 0 to 55%. Further, as a polymerization form, a graft polymer is preferable from the viewpoint of suppressing elongation in the longitudinal direction of the tape. This ethylene, vinyl acetate,
The amount of the vinyl chloride copolymer is 100 vinyl chloride resin.
It is 1 to 40 parts by weight, preferably 3 to 35 parts by weight based on parts by weight. If the amount is less than 1 part by weight, the desired effect of addition cannot be expected, while if the amount exceeds 40 parts by weight, the tear strength and the total length elongation become too large, resulting in poor hand-cutting properties. Become. This is because the elastic behavior of the ethylene-vinyl acetate-vinyl chloride copolymer has the effect of increasing cutting by adding a certain amount to the vinyl chloride resin, and toughness when adding a large amount beyond the certain range. Because it works elastically.

[0009] A plasticizer and a filler are mixed with the above resin component, and the mixture is rolled into a sheet or film to obtain a PVC base material. As a plasticizer, dioctyl phthalate (D
OP) is the most common and can be preferably used in the present invention. Generally, when the amount of the plasticizer is reduced,
The PVC base material has a reduced elongation at break, and the hardness and tensile strength are increased. On the other hand, if the amount is too large, the hardness of the PVC base material is reduced, and the elongation at break is increased, making it difficult to cut. Therefore,
The amount of the plasticizer in the present invention is 10
It is preferably 35 to 55 parts by weight with respect to 0 parts by weight.

As the filler, calcium carbonate particles are the most common and can be preferably used in the present invention. However, fillers such as silica, talc, and titanium oxide particles which are conventionally known as fillers are used. It can also be selected appropriately and used. The average particle size of the particles is 0.1.
It is preferably about 01 to 0.2 μm. In general, when the amount of the filler is small, the effect of improving the hand-cutting property is reduced. On the other hand, when the amount of the filler is large, longitudinal tearing is likely to occur. Therefore, the amount of the filler in the present invention is preferably 3 to 60 parts by weight based on 100 parts by weight of the vinyl chloride resin.

[0011] If necessary, additives which are usually added to the PVC base material, such as stabilizers and colorants, can be added to the PVC base material in appropriate amounts. Further, the thickness of the PVC base material may be the same as the conventional one.

Then, a pressure-sensitive adhesive layer is provided on one side of the above-mentioned PVC base material to obtain a PVC-based pressure-sensitive adhesive tape of the present invention. The pressure-sensitive adhesive layer is not particularly limited, and the pressure-sensitive adhesive conventionally used for this kind of pressure-sensitive adhesive sheet is coated with a predetermined thickness (for example, 1).
0 to 50 μm).

[0013]

EXAMPLES The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited thereto. (Examples 1 to 4 and Comparative Examples 1 to 3) Compounds having the composition shown in Table 1 were kneaded at 140 ° C. for 5 minutes using two rolls, and rolled to a thickness of 0.2 mm to obtain a substrate for an adhesive tape. I got For this substrate, a tensile test (JIS K672)
3; tensile speed and breaking elongation were determined by a tensile speed of 200 mm / min, and the tear strength was determined by a tear test (a perpendicular tear load according to JIS K 6732; tensile speed of 200 mm / min). In addition, the total length elongation was determined as a rate of change between the test piece marked line in the tensile test before and after the test (measured by connecting the cut portions). The results are shown in Table 1.

[0014]

[Table 1]

* 1: Vinyl chloride resin; average degree of polymerization: 105
0 * 2: Ethylene / vinyl acetate / vinyl chloride copolymer; ZEST GR3Z manufactured by Shin-Daiichi PVC Co., Ltd. * 3: Plasticizer; dioctyl phthalate; Mitsubishi Chemical Corporation
* 4: Stabilizer; lead tribasic sulfate + lead stearate; SAK-YD manufactured by Shinagawa Kako Co., Ltd. * 5: Filler; calcium carbonate; V manufactured by Shiraishi Industry Co., Ltd.
IGOT10 * 6: Ethylene-vinyl acetate copolymer; Mitsubishi Yuka Corporation
Made EVA25K

Comparative Examples 1 and 2 show examples of conventional PVC base materials. Comparative Example 3 shows a case where a large amount of an ethylene / vinyl acetate / vinyl chloride copolymer is used beyond the range specified in the present invention. This is an example. As is clear from Table 1 above, all of the PVC substrates of Examples 1 to 4 of the present invention had tensile strength, breaking strength, tear strength and total elongation percentage as compared with the conventional PVC substrates of Comparative Examples 1 and 2. Shows a low value in all of the above, and the hand-cutting property is generally good. Also,
From Comparative Example 3, it was confirmed that when a large amount of the ethylene / vinyl acetate / vinyl chloride copolymer was used beyond the specified range of the present invention, the hand-cutting property was rather deteriorated.

[0017]

As described above, according to the present invention,
A PVC-based pressure-sensitive adhesive tape having excellent hand-cutting properties as compared with conventional ones and suppressing generation of longitudinal tears and elongation in the longitudinal direction of the tape is provided.

Claims (3)

[Claims] 1. A pressure-sensitive adhesive layer is formed on one surface of a sheet or film-like substrate obtained by blending a plasticizer and a filler with a resin component containing a vinyl chloride resin and an ethylene / vinyl acetate / vinyl chloride copolymer. A PVC-based pressure-sensitive adhesive tape provided. 2. The resin component is a vinyl chloride resin 100.
The PVC-based pressure-sensitive adhesive tape according to claim 1, wherein 1 to 40 parts by weight of an ethylene / vinyl acetate / vinyl chloride copolymer is blended with respect to part by weight. 3. The plasticizer is 35 to 55 parts by weight and the filler is 3 to 6 parts by weight based on 100 parts by weight of the vinyl chloride resin.
3. The composition according to claim 1, wherein 0 part by weight is blended.
The PVC-based pressure-sensitive adhesive tape according to 1.