JPH0940921A - Polyvinyl chloride adhesive tape - Google Patents

Abstract

(57) [PROBLEMS] To provide a polyvinyl chloride pressure-sensitive adhesive tape which has excellent strength and can be easily cut off with a fingertip. SOLUTION: Per 100 parts by weight of vinyl chloride resin,
5 to 5 inorganic fine particles having an average particle diameter of 0.1 to 10 μm
An adhesive tape comprising a vinyl chloride resin film containing 40 parts by weight of an adhesive layer on at least one side thereof, wherein a linear groove having a V-shaped or U-shaped cross section is provided on at least one side of the tape in parallel with the width direction of the tape. A plurality of tangential lines drawn at a position of 1/2 of the groove depth are formed on each of the two curved surfaces of the U shape or the angle formed by the two V-shaped inclined surfaces of the groove section facing each other with the tape surface. Angles A and B each of which is an angle with the tape surface satisfy the following relational expressions 1 to 3, the groove depth is 1/20 to 2/5 of the tape thickness, and the groove pitch is 50 to 300 μm. An adhesive tape made of polyvinyl chloride. ## EQU1 ## A ≦ B ≦ 5A A + B ≦ 110 ° 10 ° ≦ A ≦ 50 ° 20 ° ≦ B ≦ 90 °

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyvinyl chloride adhesive tape. More specifically, the present invention relates to a polyvinyl chloride pressure-sensitive adhesive tape that has excellent strength and can be easily cut off with a fingertip.

[0002]

2. Description of the Related Art Conventionally, as an adhesive tape used for sealing or electrical insulating tape for packaging and cardboard boxes, an adhesive tape made of paper, an adhesive tape made of cloth, an adhesive tape made of polyolefin resin, an adhesive tape made of polyvinyl chloride. Is widely used. Among these, especially polyvinyl chloride adhesive tape is good in water resistance, excellent in strength and electrical insulation, but can not be easily cut with fingertips, because it is necessary to use scissors or a cutter, There is a problem that the workability of packaging, covering and sealing is poor.

As a method of improving the hand-cutability at the fingertip,
It is generally known that perforations and cuts are made in the adhesive tape, but when these methods are applied to the polyvinyl chloride adhesive tape, the tensile strength is extremely reduced, and therefore sealing strength is required. It was not practical in some cases. Further, when a method of simply forming a cut or a recess as described in JP-A-56-120784 is used for a polyvinyl chloride pressure-sensitive adhesive tape, the hand-cutting property is good but the strength is still high. Was not enough. Further, Japanese Patent Publication No. 50-13306 discloses an adhesive tape having grooves on its surface for improving the rewinding property of the tape and the marking property with ink, pencil and the like. There was a problem that it was not compatible with sharpness.

[0004]

PROBLEM TO BE SOLVED BY THE INVENTION It is an object of the present invention to provide an adhesive tape made of polyvinyl chloride which has excellent strength and can be easily cut off with a fingertip.

[0005]

The present invention has an average particle diameter of 0.1 to 10 μm per 100 parts by weight of vinyl chloride resin.
In a pressure-sensitive adhesive tape comprising a vinyl chloride resin film containing 5 to 40 parts by weight of inorganic fine particles of m, the pressure-sensitive adhesive layer being provided on at least one side, the tape having a V-shaped cross section or a V-shaped cross section on at least one side of the tape in parallel with the width direction of the tape. A plurality of U-shaped linear grooves are formed, and each of two opposing V-shaped inclined surfaces of the groove cross section forms a corner with the tape surface or two U-shaped opposing surfaces.
Angles A and B, which are the angles formed by the tangents drawn to each of the two curved surfaces at the position of 1/2 of the groove depth, respectively, satisfy the following relational expressions ~, and the groove depth is the tape thickness. 1/20 of
˜2 / 5, and the groove pitch is 50 to 300 μm, and the polyvinyl chloride adhesive tape is characterized in that the inorganic fine particles are calcium carbonate or magnesium carbonate.

[Formula 2] A ≦ B ≦ 5A A + B ≦ 110 ° 10 ° ≦ A ≦ 50 ° 20 ° ≦ B ≦ 90 °

[0006]

The present invention will be described in more detail below. In the present invention, the vinyl chloride-based resin means, in addition to polyvinyl chloride, vinyl chloride-based copolymers of vinyl chloride and other comonomers, mixtures thereof, or these and other polymers or copolymers. A mixture of The vinyl chloride resin film used in the present invention is preferably imparted with flexibility in order to adapt to various packaging forms, and a plasticizer usually used for vinyl chloride resin is added to 100 parts by weight of vinyl chloride resin. 20 to 60 parts by weight is preferable.

In the present invention, the vinyl chloride resin film contains the inorganic fine particles in an amount of 5 to 40 parts by weight, preferably 10 to 30 parts by weight, based on 100 parts by weight of the vinyl chloride resin. Average particle size is 0.1
10 to 10 μm, preferably 0.5 to 5 μm. If the content of the inorganic fine particles is less than 5 parts by weight, the effect of improving hand tearability is poor, and if it is more than 40 parts by weight, the strength of the adhesive tape is poor. Specific examples of the inorganic fine particles include calcium carbonate,
Examples thereof include magnesium carbonate, aluminum oxide, silicon oxide, aluminum silicate, and talc, and calcium carbonate and magnesium carbonate are particularly preferable because they are easily available.

Further, additives such as a heat stabilizer, a lubricant, a colorant, an ultraviolet absorber and an antistatic agent may be added to the vinyl chloride resin film, if necessary. The thickness of the vinyl chloride resin film (hereinafter referred to as “film”) of the present invention is 5 from the viewpoint of workability and strength in packaging and sealing.
It is preferable that the thickness is 0 to 200 μm. As a method of forming a groove in the film, a method of processing with an embossing roll or a press plate having a specific unevenness or convexity can be mentioned. The groove is a straight line on at least one side of the film so as to be parallel to the width direction of the polyvinyl chloride adhesive tape (hereinafter referred to as "adhesive tape") (that is, perpendicular to the longitudinal direction of the tape). The groove cross section must be
It is V-shaped or U-shaped. The groove has a tangent line drawn at an angle of 1/2 of the groove depth to each of the two V-shaped opposing inclined surfaces and the adhesive tape surface, or to each of the two U-shaped opposing curved surfaces (see FIG. 2). Angles A and B, which are angles formed by a and b) with the surface of the adhesive tape, satisfy the following relational expressions 1 to 3, and the depth of the groove (D in FIGS. 1 and 2) is the film thickness (T in FIGS. 1 and 2).
1/20 to 2/5, preferably 1/10 to 3/10, and the groove pitch (P in FIGS. 1 and 2) is 50 to 300 μ.
m, preferably 100 to 250 μm.

[0009]

## EQU00003 ## A.ltoreq.B.ltoreq.5A A + B.ltoreq.110.degree. 10.degree..ltoreq.A.ltoreq.50.degree. 20.degree..ltoreq.B.ltoreq.90.degree. Not compatible. By the groove shape satisfying the above formula, and by containing the above-mentioned predetermined inorganic fine particles in the tape, a polyvinyl chloride pressure-sensitive adhesive tape excellent in strength and easily cut with a fingertip can be obtained. .

Examples of the pressure-sensitive adhesive used in the present invention include natural rubber pressure-sensitive adhesives, synthetic rubber pressure-sensitive adhesives, and synthetic resin pressure-sensitive adhesives such as acrylic pressure-sensitive adhesives. To provide a pressure-sensitive adhesive layer on a film having a predetermined groove, for example, a coating solution prepared by dissolving the pressure-sensitive adhesive in a solvent such as toluene or ethyl acetate is directly applied to the film surface by a conventional method such as reverse roll coating. After that, it may be dried or once applied to a release paper and dried, and then transferred to the film surface.

[0011]

Example: Polyvinyl chloride (average degree of polymerization: 1100) 1
00 parts by weight, di-2-ethylhexyl phthalate 35 parts by weight, Ba-Zn-based composite liquid stabilizer 1 part by weight, Ba-Z
1 part by weight of n-based composite powder stabilizer, 0.5 part by weight of methylenebisstearamide, and a predetermined amount of inorganic fine particles shown in Table 1 were blended, and a vinyl chloride resin film having a thickness of 100 μm was formed by a calender device. .

Using the molded vinyl chloride resin film, Examples 1 to 3 were prepared by adjusting the shape of the embossing surface of the embossing roll as shown in Table 1 and FIG.
The films of Comparative Examples 1 to 6 were obtained. For example, the film of Example 1 uses an embossing roll having a diameter of 210 mm and a surface shape of 200 μm in pitch (P ′ in FIG. 3) and 95 μm in grain height (T ′ in FIG. 3), and is 130 in infrared heater. The film heated to 0 ° C. was passed between a water-cooled embossing roll and a water-cooled rubber roll at a linear pressure of 0.4 kg / cm to form a linear groove parallel to the film width direction on one surface of the film. An acrylic pressure-sensitive adhesive was applied to the smooth surface side of the embossed film thus obtained and dried at 100 ° C. to prepare a pressure-sensitive adhesive film. Further, this film was cut into a width of 2 cm to obtain an adhesive tape.

Using the pressure-sensitive adhesive tape thus obtained, the ease of cutting with a fingertip and the strength were evaluated, and the results are shown in Table 2. The evaluation method is as follows. (1) Ease of cutting with fingertips Without using jigs such as scissors and a cutter, the adhesive tape was cut in the width direction only with the fingertips of both hands, and the ease of cutting at that time was evaluated. The evaluation criteria are as follows. ○: Easy to cut and requires almost no force. (The cutting edge is straight.) △: It takes some force to start cutting, but it easily cuts when starting to cut. (The cut end is straight.) × ... It is difficult to cut, and it will grow when you try to cut it. (The cut end is rippling.)

(2) Strength Regarding the lateral direction (width direction) of the adhesive tape, JIS K
According to 6732, the Elemendorf tear strength was measured. Regarding the vertical direction (longitudinal direction) of the adhesive tape, JIS
Tensile strength and elongation were measured according to Z0237.

[0015]

[Table 1]

[0016]

[Table 2]

[0017]

EFFECT OF THE INVENTION The polyvinyl chloride adhesive tape of the present invention is excellent in strength and easy to cut with a fingertip, and therefore has excellent workability in packaging, covering and sealing, and is extremely useful.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an example of an embossed film.

FIG. 2 is a schematic cross-sectional view of an example of an embossed film.

FIG. 3 is a schematic cross-sectional view of the embossing roll surface.

[Explanation of symbols]

A, B At the position of 1/2 of the groove depth on each of the two V-shaped inclined surfaces of the V-shaped cross-section facing the tape surface or the two U-shaped U-shaped curved surfaces facing each other. Angles of each drawn tangent to the tape surface α, β Emboss roll embossing film angle D Embossing film groove depth P Embossing film groove pitch P'Embossing roll embossing film pitch T Embossing film thickness T'Embossing Roll height W Groove width of embossed film a, b Tangent line drawn at position of groove depth 1/2 of U-shaped groove a ', b' U of groove depth 1/2 position

Claims (2)

[Claims] 1. A 100 parts by weight of vinyl chloride resin,
5 to 5 inorganic fine particles having an average particle diameter of 0.1 to 10 μm
In an adhesive tape comprising a vinyl chloride resin film containing 40 parts by weight of an adhesive layer on at least one surface, a linear groove having a V-shaped or U-shaped cross section is provided on at least one surface of the tape in parallel to the width direction of the tape. A plurality of tangential lines drawn at a position of 1/2 of the groove depth are formed on each of the two curved surfaces of the U shape or the angle formed by the two V-shaped inclined surfaces of the groove section facing each other with the tape surface. Angles A and B, which are angles formed with the tape surface, satisfy the following relational expressions 1 to 5, the groove depth is 1/20 to 2/5 of the tape thickness, and the groove pitch is 50 to 300 μm. An adhesive tape made of polyvinyl chloride characterized by being present. ## EQU1 ## A ≦ B ≦ 5A A + B ≦ 110 ° 10 ° ≦ A ≦ 50 ° 20 ° ≦ B ≦ 90 ° 2. The polyvinyl chloride pressure-sensitive adhesive tape according to claim 1, wherein the inorganic fine particles are calcium carbonate or magnesium carbonate.