JP2942939B2 - Adhesive tape - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive tape which is wound around an outer circumference when a plurality of wires and cables are bundled, and is wound around a joint between the cables when the wires and cables are connected.

[0002]

2. Description of the Related Art Generally, when a plurality of polyvinyl chloride wires are bundled in one place, the polyvinyl chloride wires having insulating properties are provided so that the bundled polyvinyl chloride wires are not damaged and current is leaked. An adhesive tape made of a vinyl resin such as a resin is used. When a covered electric wire such as a polyvinyl chloride electric wire or a cable is connected on the way, the connecting portion is insulated so as not to cause a short circuit or the like at the connecting portion. In order to maintain the insulation of the connection, an adhesive tape is wrapped around the connection to ensure insulation and mechanical strength of the connection. This adhesive tape is made of PVC having an insulating polyvinyl chloride resin as a support.
A (polyvinyl chloride) -based adhesive tape is used.

[0003] Such a PVC-based adhesive tape has conventionally been
It has a configuration as shown in FIG. That is, the PVC-based adhesive tape 100 is formed in a sheet shape, and is wound around the core 200. This PVC adhesive tape 100
Has a support 110 made of a PVC-based polymer, a plasticizer, a stabilizer, and a pigment. Specifically, the support 110 includes 100 parts by weight of polyvinyl chloride having an average degree of polymerization of 1100, 50 parts by weight of dioctyl phthalate, 4 parts by weight of a Pb-based stabilizer, and 2 parts by weight of a white pigment (titanium oxide). Has become. And the thickness of this support 110 is
It is 150 μm.

On the lower surface (upper surface in FIG. 3) of the support 110, when the PVC adhesive tape 100 is wound around the member to be wound, the PVC adhesive tape 100 is sufficiently adhered to the member to be wound. An adhesive 120 made of a tackifying resin and a softener is applied to the entire surface. Further, a primer 1 is provided between the adhesive 120 and the lower surface of the support 110.
30 are provided. This primer 130 is
As shown in FIG. 3, the C-based pressure-sensitive adhesive tape 100 is wound around a core 200 in a roll shape, and P is wound around the core 200 in a roll shape.
When the VC adhesive tape 100 is pulled out, the adhesive 120
Is to prevent the adhesive from peeling off from the lower surface of the adhesive tape 100 and adhering to the upper surface of the wound PVC-based adhesive tape 100. This adhesive 120 is
Specifically, it has a composition as shown in Table 4, and
The primer 130 is composed of Hevea Plus MG49, which is a polymer of natural rubber and MMA (methyl methacrylate) (a mixture of 80% graft polymer, 10% free MMA, and 10% free natural rubber). This PVC-based pressure-sensitive adhesive tape 100 has a sheet-like support 11
The pressure-sensitive adhesive 120 is applied to the entire lower surface of the support 110. However, when the adhesive 120 is applied to the entire lower surface of the sheet-like support 110, the entire thickness including the thickness of the support 110 is applied. The pressure-sensitive adhesive 120 is applied so that the surface is substantially uniform.

[0005] In producing such a PVC-based adhesive tape, first, a polyvinyl chloride resin or the like is formed into a wide sheet, and a primer is coated on one surface of a sheet-like support of the polyvinyl chloride resin or the like. The agent is applied and wound up to a predetermined length such as 5 m or 10 m to produce a long rolled tape as shown in FIG. Thereafter, as shown in FIG. 5, the tape wound in the form of a long roll is cut into a predetermined width of, for example, 15 mm or 20 mm to produce a generally used PVC-based adhesive tape.

[0006] The pressure-sensitive adhesive 120 of the pressure-sensitive adhesive tape 100 manufactured as described above is deteriorated by heat and light. The deterioration of the pressure-sensitive adhesive 120 of the pressure-sensitive adhesive tape 100 appears as a decrease in cohesive strength, which is a characteristic of the pressure-sensitive adhesive. This decrease in cohesive force causes a decrease in the adhesiveness of the pressure-sensitive adhesive tape, and affects the performance of the pressure-sensitive adhesive tape itself. For this reason, the conventional adhesive 1
20 is mixed with a phenolic antioxidant to prevent the cohesive strength of the pressure-sensitive adhesive from being reduced. That is, as the constitution of the pressure-sensitive adhesive 120, specifically, 60 parts by weight of a synthetic rubber-based resin (styrene-butadiene-based copolymer), 40 parts by weight of a natural rubber-based resin, and 10 parts by weight of a softener (polyisoprene) 10
Parts by weight, 3 parts by weight of phenolic antioxidant.

However, this phenolic antioxidant has the effect of discoloring the support 110 made of a vinyl chloride polymer from white to pink or brown. If the support 110 is discolored to pink or brown in this way, it means that the intention of using the white pressure-sensitive adhesive tape becomes brown, so that the support 110 cannot be used as a colored pressure-sensitive adhesive tape. Therefore, in order to prevent such discoloration of the support, there has been adopted a method of using a benzimidazole-based compound in addition to a phenol-based anti-aging agent added to the adhesive (for example,
JP-B-57-52387.

[0008]

Such a PVC-based adhesive tape is used for bundling a plurality of polyvinyl chloride electric wires at one place or for maintaining insulation of a connection portion of the polyvinyl chloride electric wire. Therefore, once used, they cannot be reused. For this reason, it is necessary to maintain properties (heat resistance) such as good adhesiveness, little decrease in cohesive force over a long period of time, and difficulty in discoloring over a long period of time, as a PVC-based pressure-sensitive adhesive tape. It needs to be low. That is, a PVC-based adhesive tape is
It is necessary to have the same production cost as a VC-based adhesive tape and to have higher heat resistance than a conventional PVC-based adhesive tape.
This leads to an improvement in the performance of the VC-based adhesive tape.

In a conventional pressure-sensitive adhesive (PVC) tape, a phenolic antioxidant and a benzimidazole-based antioxidant are added to the conventional pressure-sensitive adhesive to prevent discoloration of the support.
In terms of preventing discoloration of the support, it is effective, but requires the use of a large amount of a high-cost benzimidazole-based antioxidant, which increases the cost of the PVC-based adhesive tape. have.

The present invention is intended to suppress the increase in the production cost of a PVC-based pressure-sensitive adhesive tape by adding no benzimidazole-based antioxidant to the pressure-sensitive adhesive or by adding a small amount of the benzimidazole-based anti-aging agent. It is an object of the present invention to provide a pressure-sensitive adhesive tape which can prevent the cohesive force, which is a characteristic of the above, from decreasing over time and can suppress discoloration of the support.

[0011]

Means for Solving the Problems To achieve the above object, the pressure-sensitive adhesive tape of the present invention comprises polyvinyl chloride 1
00 parts by weight, 50 parts by weight of a phthalate plasticizer,
0.1 to 20 parts by weight of epoxidized soybean oil (excluding 2 parts by weight), 4 parts by weight of a Pb-based stabilizer, and a pigment
On at least one surface of a support comprising a vinyl chloride resin composition, a rubber material comprising a synthetic rubber and a natural rubber mixed with a softener is added to a phenol-based antioxidant and a benzimidazole-based material.
It is constituted by applying a pressure-sensitive adhesive containing an anti-aging agent .

[0012]

[0013]

[0014]

[Effect] 100 parts by weight of polyvinyl chloride, 50 parts by weight of phthalate ester plasticizer, epoxidized soybean oil 0.1 to 2
0 parts by weight (excluding 2 parts by weight), 4 parts by weight of a Pb-based stabilizer, and a vinyl chloride resin composition containing a pigment.
That on at least one surface of a support, pressure-sensitive <br/> Chakuzai made by blending the phenol-based antioxidant and benzimidazole antioxidants in rubber material obtained by blending a softening agent in synthetic rubber and natural rubber because and the are constituted by coating, the color change of the support with a decrease cohesion of heat by the adhesive can be prevented
It can be suppressed over a longer period .

[0015]

[0016]

[0017]

Embodiments of the present invention will be described below. 1 and 2 show an embodiment of the pressure-sensitive adhesive tape according to the present invention.

In the drawings, reference numeral 1 denotes an adhesive tape which is used for winding a plurality of wires / cables around an outer periphery when bundling the wires or a joint portion between the cables when connecting the wires / cables. It is. 2 is a support,
An epoxidized soybean oil is added to a polyvinyl chloride resin in addition to a plasticizer, a stabilizer, and a pigment. As the polyvinyl chloride resin, polyvinyl chloride having an average degree of polymerization of 800 to 2000 is used. Examples of the plasticizer include a phthalate plasticizer, a trimellitate plasticizer, and a polyester plasticizer. The phthalate plasticizers include dioctyl phthalate (DOP), diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), and diundecyl phthalate (DUP). In addition, the trimellitate plasticizers include triocicle trimellitate (TOTM) and trinormal ocicle trimellitate (TnOTM). The polyester-based plasticizer is a high-molecular-weight plasticizer characterized by containing many ester bonds in a single molecule. The stabilizer includes a Pb-based stabilizer, and the pigment includes a white pigment (titanium oxide). This support 2 is
The core 3 is formed to have a thickness of 50 to 150 μm (in this embodiment, it is formed to have a thickness of 150 μm).
Is wrapped around.

The epoxidized soybean oil is 0.1% when the benzimidazole-based antioxidant is not added to the adhesive 4.
-20 parts by weight. The reason why the amount of the epoxidized soybean oil is set to 0.1 part by weight or more is that when the amount of the epoxidized soybean oil is less than 0.1 part by weight, the phenolic antioxidant mixed in the adhesive 4 is used. This is because the effect of suppressing discoloration of the polyvinyl chloride resin constituting the support 2 over a long period of time is not improved as compared with the conventional example. The reason why the amount of the epoxidized soybean oil is set to 20 parts by weight or less is that even if the amount of the epoxidized soybean oil exceeds 20 parts by weight, no further suppression effect can be obtained.

The epoxidized soybean oil is blended in an amount of 2 to 5 parts by weight when 1.5 to 0.5 parts by weight of a benzimidazole antioxidant is added to the adhesive 4. The reason why the amount of the epoxidized soybean oil is set to 2 parts by weight or more is that the amount of the epoxidized soybean oil is increased even when 1.5 parts by weight of the benzimidazole-based antioxidant is added to the pressure-sensitive adhesive 4. 2
When the amount is less than the weight part, the effect of suppressing the discoloration of the polyvinyl chloride resin constituting the support 2 for a long period of time does not increase as compared with the conventional example. The reason why the amount of the epoxidized soybean oil is set to 5 parts by weight or less is that when the adhesive 4 contains about 0.5 part by weight of a benzimidazole-based antioxidant, 5 parts by weight of the epoxidized soybean oil is used. The effect of suppressing the discoloration of the polyvinyl chloride resin over a long period of time can be sufficiently obtained by blending the epoxidized soybean oil. is there. That is, the amount of the expensive benzimidazole-based antioxidant to be mixed into the pressure-sensitive adhesive 4 can be reduced from 1.5 to 0.5 parts by weight by mixing 2 to 5 parts by weight of the epoxidized soybean oil.

The support 2 thus constructed is made of a polyvinyl chloride resin originally formed in a wide sheet shape as shown in FIG.
The tape is cut into a strip having a predetermined width as shown in FIG.

Reference numeral 4 denotes an adhesive, which is used when the adhesive tape 1 is wound around the outer circumference to bundle a plurality of wires and cables, and when the wires and cables are connected and wound around a joint between the cables. The support 2 acts so as to be fixed to the wound body. This adhesive 4
It is composed of synthetic rubber, natural rubber, softener and anti-aging agent, and is formed to a thickness of 30 μm. The synthetic rubber is specifically a styrene-butadiene polymer (emulsion type), the softener is specifically polyisoprene (emulsion type), and the antioxidant is specifically a phenolic antioxidant. . To the pressure-sensitive adhesive 4, a benzimidazole-based antioxidant is added as needed. The compounding amount of the benzimidazole is 0.5 to 1.5 parts by weight. The compounding amount of benzimidazole of 1.5 parts by weight is a compounding amount indicated in Japanese Patent Publication No. 57-52387, which is a known example, and 2 to 5 parts by weight of epoxidized soybean oil is added to the support 2. As it is added, the amount of benzimidazole is reduced from 1.5 parts by weight to 0.5 part by weight without reducing the effect of suppressing discoloration of the support for a longer period of time and the effect of preventing the adhesive from decreasing the cohesive force due to heat. It can be reduced to parts by weight.

Reference numeral 5 denotes a primer, which is uniformly coated on the entire surface of one side of the support 2. The primer 5 stably fixes the pressure-sensitive adhesive 4 to the support 2 and is made of MMA-grafted natural rubber. Such a pressure-sensitive adhesive tape 1 is formed by coating a primer 5 on one surface of a polyvinyl chloride resin molded into a wide sheet, applying a pressure-sensitive adhesive 4 and winding the tape to a predetermined length such as 5 m or 10 m. A tape is manufactured, and then, the tape wound into a long roll is, for example, 15 mm, 2 mm long.
It is manufactured by cutting to a predetermined width such as 0 mm.

Hereinafter, a specific embodiment of the present invention will be described in comparison with a conventional example. Example 1 In this example, PVC (polyvinyl chloride having an average degree of polymerization of 1100, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.)
50 parts by weight of dioctyl phthalate (specifically, DOP manufactured by Sekisui Chemical Co., Ltd.) and epoxidized soybean oil (specifically, manufactured by Dainippon Ink Co., Ltd.)
O-130P) 0.1 part by weight, a Pb-based stabilizer (specifically, OGW-02 manufactured by Mizusawa Chemical Co., Ltd.) 4 parts by weight, and a support prepared by mixing 2 parts by weight of a white pigment (titanium oxide) , Emulsion type styrene-butadiene-based polymer (specifically, PL460 manufactured by Nippon Synthetic Rubber Co., Ltd.)
1) 60 parts by weight, 30 parts by weight of natural rubber, emulsion-type polyisoprene (specifically, L
(IR700) and 3 parts by weight of a phenolic antioxidant (specifically, KM2106 manufactured by Yoshitomi Pharmaceutical Co., Ltd.).

Example 2 In this example, PVC (polyvinyl chloride having an average degree of polymerization of 1100, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.)
50 parts by weight of dioctyl phthalate (specifically, DOP manufactured by Sekisui Chemical Co., Ltd.) and epoxidized soybean oil (specifically, manufactured by Dainippon Ink Co., Ltd.)
O-130P) 1 part by weight, a Pb-based stabilizer (specifically,
A support comprising 4 parts by weight of OGW-02 manufactured by Mizusawa Chemical Co., Ltd. and 2 parts by weight of a white pigment (titanium oxide) is mixed with an emulsion type styrene-butadiene-based polymer (specifically, Nippon Synthetic Rubber Co., Ltd. 60 parts by weight of PL4601), 30 parts by weight of natural rubber, emulsion type polyisoprene (specifically, LIR70 manufactured by Kuraray Co., Ltd.)
0) 10 parts by weight of a phenolic antioxidant (specifically, KM2106 manufactured by Yoshitomi Pharmaceutical Co., Ltd.) was coated with a pressure-sensitive adhesive.

Example 3 In this example, PVC (polyvinyl chloride having an average degree of polymerization of 1100, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.)
50 parts by weight of dioctyl phthalate (specifically, DOP manufactured by Sekisui Chemical Co., Ltd.) and epoxidized soybean oil (specifically, manufactured by Dainippon Ink Co., Ltd.)
O-130P) 5 parts by weight, a Pb-based stabilizer (specifically,
A support comprising 4 parts by weight of OGW-02 manufactured by Mizusawa Chemical Co., Ltd. and 2 parts by weight of a white pigment (titanium oxide) is mixed with an emulsion type styrene-butadiene-based polymer (specifically, Nippon Synthetic Rubber Co., Ltd. 60 parts by weight of PL4601), 30 parts by weight of natural rubber, emulsion type polyisoprene (specifically, LIR70 manufactured by Kuraray Co., Ltd.)
0) 10 parts by weight of a phenolic antioxidant (specifically, KM2106 manufactured by Yoshitomi Pharmaceutical Co., Ltd.) was coated with a pressure-sensitive adhesive.

Example 4 In this example, PVC (polyvinyl chloride having an average degree of polymerization of 1100, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.)
50 parts by weight of dioctyl phthalate (specifically, DOP manufactured by Sekisui Chemical Co., Ltd.) and epoxidized soybean oil (specifically, manufactured by Dainippon Ink Co., Ltd.)
O-130P) 10 parts by weight, a Pb-based stabilizer (specifically, OGW-02 manufactured by Mizusawa Chemical Co., Ltd.) 4 parts by weight, and a white pigment (titanium oxide) 2 parts by weight are blended with a support. Type styrene-butadiene-based polymer (specifically, PL460 manufactured by Nippon Synthetic Rubber Co., Ltd.)
1) 60 parts by weight, 30 parts by weight of natural rubber, emulsion-type polyisoprene (specifically, L
(IR700) and 3 parts by weight of a phenolic antioxidant (specifically, KM2106 manufactured by Yoshitomi Pharmaceutical Co., Ltd.).

Example 5 In this example, PVC (polyvinyl chloride having an average degree of polymerization of 1100, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.)
50 parts by weight of dioctyl phthalate (specifically, DOP manufactured by Sekisui Chemical Co., Ltd.) and epoxidized soybean oil (specifically, manufactured by Dainippon Ink Co., Ltd.)
O-130P) 20 parts by weight, a Pb-based stabilizer (specifically, OGW-02 manufactured by Mizusawa Chemical Co., Ltd.) 4 parts by weight, and a white pigment (titanium oxide) 2 parts by weight are blended with a support. Type styrene-butadiene-based polymer (specifically, PL460 manufactured by Nippon Synthetic Rubber Co., Ltd.)
1) 60 parts by weight, 30 parts by weight of natural rubber, emulsion-type polyisoprene (specifically, L
(IR700) and 3 parts by weight of a phenolic antioxidant (specifically, KM2106 manufactured by Yoshitomi Pharmaceutical Co., Ltd.).

Example 6 In this example, PVC (polyvinyl chloride having an average degree of polymerization of 1100, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.)
50 parts by weight of dioctyl phthalate (specifically, DOP manufactured by Sekisui Chemical Co., Ltd.) and epoxidized soybean oil (specifically, manufactured by Dainippon Ink Co., Ltd.)
O-130P) 2 parts by weight, a Pb-based stabilizer (specifically,
A support comprising 4 parts by weight of OGW-02 manufactured by Mizusawa Chemical Co., Ltd. and 2 parts by weight of a white pigment (titanium oxide) is mixed with an emulsion type styrene-butadiene-based polymer (specifically, Nippon Synthetic Rubber Co., Ltd. 60 parts by weight of PL4601), 30 parts by weight of natural rubber, emulsion type polyisoprene (specifically, LIR70 manufactured by Kuraray Co., Ltd.)
0) 10 parts by weight, 3 parts by weight of a phenolic antioxidant (specifically, KM2106 manufactured by Yoshitomi Pharmaceutical Co., Ltd.), 1.5 parts by weight of a benzimidazole antioxidant (specifically, 2-mercaptobenzimidazole) It is coated with a pressure-sensitive adhesive composed of parts.

Example 7 In this example, PVC (polyvinyl chloride having an average degree of polymerization of 1100, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.)
50 parts by weight of dioctyl phthalate (specifically, DOP manufactured by Sekisui Chemical Co., Ltd.) and epoxidized soybean oil (specifically, manufactured by Dainippon Ink Co., Ltd.)
O-130P) 5 parts by weight, a Pb-based stabilizer (specifically,
A support comprising 4 parts by weight of OGW-02 manufactured by Mizusawa Chemical Co., Ltd. and 2 parts by weight of a white pigment (titanium oxide) is mixed with an emulsion type styrene-butadiene-based polymer (specifically, Nippon Synthetic Rubber Co., Ltd. 60 parts by weight of PL4601), 30 parts by weight of natural rubber, emulsion type polyisoprene (specifically, LIR70 manufactured by Kuraray Co., Ltd.)
0) 10 parts by weight, 3 parts by weight of a phenolic antioxidant (specifically, KM2106 manufactured by Yoshitomi Pharmaceutical Co., Ltd.), 0.5 parts by weight of a benzimidazole antioxidant (specifically, 2-mercaptobenzimidazole) It is coated with a pressure-sensitive adhesive composed of parts.

Conventional Example 1 Conventional Example 1 is made of PVC (polyvinyl chloride having an average degree of polymerization of 1100, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.)
Dioctyl phthalate (specifically, DOP manufactured by Sekisui Chemical Co., Ltd.) 50 parts by weight, Pb
System stabilizer (specifically, OGW- manufactured by Mizusawa Chemical Co., Ltd.)
02) 60 parts by weight of an emulsion type styrene-butadiene-based polymer (specifically, PL4601 manufactured by Nippon Synthetic Rubber Co., Ltd.) on a support containing 4 parts by weight and 2 parts by weight of a white pigment (titanium oxide). 30 parts by weight of natural rubber, 10 parts by weight of an emulsion type polyisoprene (specifically, LIR700 manufactured by Kuraray Co., Ltd.), a phenolic antioxidant (specifically, KM21 manufactured by Yoshitomi Pharmaceutical Co., Ltd.)
06) An adhesive coated with 3 parts by weight is applied.

Conventional Example 2 Conventional Example 2 is made of PVC (polyvinyl chloride having an average degree of polymerization of 1100, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.)
Dioctyl phthalate (specifically, DOP manufactured by Sekisui Chemical Co., Ltd.) 50 parts by weight, Pb
System stabilizer (specifically, OGW- manufactured by Mizusawa Chemical Co., Ltd.)
02) 60 parts by weight of an emulsion type styrene-butadiene-based polymer (specifically, PL4601 manufactured by Nippon Synthetic Rubber Co., Ltd.) on a support containing 4 parts by weight and 2 parts by weight of a white pigment (titanium oxide). 30 parts by weight of natural rubber, 10 parts by weight of an emulsion type polyisoprene (specifically, LIR700 manufactured by Kuraray Co., Ltd.), a phenolic antioxidant (specifically, KM21 manufactured by Yoshitomi Pharmaceutical Co., Ltd.)
06) 3 parts by weight, benzimidazole antioxidant (specifically, 2-mercaptobenzimidazole) 1.5
It is one coated with a pressure-sensitive adhesive containing parts by weight.

Comparative Example A comparative example is made of PVC (polyvinyl chloride having an average degree of polymerization of 1100, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.) 1
With respect to 00 parts by weight, 50 parts by weight of dioctyl phthalate (specifically, DOP manufactured by Sekisui Chemical Co., Ltd.) and a Pb-based stabilizer (specifically, OGW-0 manufactured by Mizusawa Chemical Co., Ltd.)
2) An emulsion type styrene / butadiene polymer (specifically, manufactured by Nippon Synthetic Rubber Co., Ltd.) is mixed with a support prepared by mixing 4 parts by weight and 2 parts by weight of a white pigment (titanium oxide).
PL4601) 60 parts by weight, natural rubber 30 parts by weight, emulsion-type polyisoprene (specifically, LIR700 manufactured by Kuraray Co., Ltd.) 10 parts by weight, benzimidazole-based antioxidant (specifically, 2-mercaptobenzimidazole) ) An adhesive coated with 3 parts by weight was applied.

The PVC adhesive tapes based on these examples and the PVC adhesive tapes according to the conventional example and the comparative example were respectively subjected to 12 hours, 15 hours, 25 hours, and 48 hours by a sunshine weatherometer.
Discoloration of the PVC film after 60 hours, after 96 hours, after 5, 6 days, 7 days, 10 days, 12 days, and 14 days in an 80 ° C. air oven, and 12H by sunshine weatherometer.
After 15 hours, after 25 hours, after 48 hours, 60 hours
Table 1 shows the comparison results of the presence or absence of adhesive cohesion failure after 96 hours, after 96 hours, and after 5, 6, 7, 10, 12, and 14 days in an 80 ° C. air oven. I have.

[0035]

[Table 1] The discoloration evaluation of the PVC film in Table 1 was performed by visual evaluation, and in the discoloration of the PVC film, は indicates no discoloration, and X indicates discoloration. Also,
The adhesive cohesive failure evaluation in Table 1 shows a state in which the adhesive loses cohesive strength, the adhesive strength is remarkably reduced, and the adhesive is separated immediately after winding. No, x indicates cohesive failure.

In Examples 1 to 5 in Table 1, epoxidized soybean oil was blended in the support 2 and in Examples 6 and 7, epoxidized soybean oil was blended in the support 2 Further, the adhesive 4 contains a benzimidazole antioxidant. On the other hand, in Conventional Example 1, Conventional Example 2, and Comparative Example, no epoxidized soybean oil was blended in the support 2, and in Conventional Example 1, only the phenolic antioxidant was blended in the adhesive 4. Conventional example 2 includes a benzimidazole-based antioxidant in addition to the phenol-based antioxidant in the adhesive 4, and the comparative example includes a phenol-based antioxidant as the antioxidant in the adhesive 4. Instead, only a benzimidazole antioxidant is blended.

As is clear from the results in Table 1, Example 1
When comparing Example 1 and Conventional Example 1, the difference in composition between Example 1 and Conventional Example 1 is that 0.5 parts by weight of epoxidized soybean oil is added to the support having the composition of Conventional Example 1. Example 1
When the discoloration evaluation of the PVC film by the sunshine weatherometer of the support is performed, the discoloration occurs at 12 hours in the conventional example 1, whereas the discoloration is not performed up to 15 hours in the example 1. It can be seen that the effect has been improved. However, in the evaluation of the discoloration of the PVC film when left in an air oven forming an atmosphere at 80 ° C. for a long time, the discoloration occurred in Example 1 and Conventional Example 1 after 6 days. In addition, comparing Example 1 with Conventional Example 1, it was found that Sunshine Weathero
Conventional example 1
, The cohesive failure occurred after 15 hours.
It can be seen that no cohesive failure occurred even after 15 hours, and the effect was improved. Further, in the adhesive cohesive failure evaluation using an air oven at 80 ° C., the conventional example 1 caused cohesive failure after 6 days, whereas the example 1 did not cause cohesive failure even after 6 days. You can see that it is improving.

When the amount of epoxidized soybean oil added to the support 2 as in Example 2 increases, the effect is further improved as compared with Example 1, as is clear from the results in Table 1. That is, in Example 2, the discoloration evaluation of the PVC film by the sunshine weatherometer of the support was as follows:
No discoloration until after 24 hours, 80 ° C air
Even in the evaluation of discoloration of the PVC film by the oven, no discoloration occurs until 7 days later. After 15 hours from Example 1, 6
The effect is improved compared to the day after. Further, in Example 2, the adhesive cohesive failure evaluation of the adhesive by the Sunshine Weatherometer showed that the adhesive caused cohesive failure after 48 hours.
C. Even in the adhesive cohesive failure evaluation using an air oven, 10
Discoloration occurs after a day. This is the same as 24Hr in Example 1.
After that, the effect is improved as compared to 7 days later.

As shown in Example 3, when more epoxidized soybean oil (5 times the amount of Example 2) is added than that of epoxidized soybean oil added to the support 2 of Example 2, The effect is further improved. That is, in Example 3, in the discoloration evaluation of the PVC film by the sunshine weatherometer of the support, no discoloration occurred until after 60 hours, and even in the evaluation of the discoloration of the PVC film by the 80 ° C. air oven, even after 12 days. Does not cause discoloration. The effect is also improved as compared with Example 2 after 24 hours and after 7 days. Further, Example 3 shows that the evaluation of adhesive cohesive failure of the adhesive shows that
Adhesive cohesive failure evaluation by weatherometer is 96H
After r, cohesive failure occurred, and in the adhesive cohesive failure evaluation using an air oven at 80 ° C., discoloration occurred after 14 days.
This shows an improvement in the effect as compared with Example 2 after 48 hours and 10 days later.

In Example 3, the effect is more improved than in Conventional Example 2 as compared with Conventional Example 2 in which a benzimidazole antioxidant is added to the adhesive in addition to the phenolic antioxidant. That is, when Example 3 and Conventional Example 2 are compared, as is clear from the results in Table 1, the difference in composition between Example 3 and Conventional Example 2 is that While conventional soybean oil was blended,
The support 2 is the same as the conventional example 1 except that the adhesive contains 1.5 parts by weight of a benzimidazole-based antioxidant in addition to the phenol-based antioxidant. Comparison between Example 3 and Conventional Example 2 shows that, in the evaluation of discoloration of the PVC film by the sunshine weatherometer of the support, Conventional Example 2 caused discoloration after 60 hours, whereas Example 3 showed discoloration after 60 hours. Discoloration occurred after 96 hours, indicating that the effect was improved. In the evaluation of the discoloration of the PVC film by the 80 ° C. air oven,
While discoloration occurred after 0 day, Example 3 showed 12
Discoloration occurred after a day, indicating that the effect was improved. Further, comparing Example 3 with Conventional Example 2, it was found that in the evaluation of adhesive cohesive failure with the Sunshine Weathero Meter for the adhesive, Conventional Example 2 showed 48 Hr.
Later, cohesive failure occurred.
It can be seen that cohesive failure did not occur later, and cohesive failure occurred after 96 hours, and the effect was improved. In addition, 80 ° C
In the adhesive cohesive failure evaluation by air oven,
While Conventional Example 2 caused cohesive failure after 12 days, Example 3 did not cause cohesive failure even after 12 days, and caused cohesive failure after 14 days, and the effect was improved. I understand.

When the amount of epoxidized soybean oil further added to the support 2 as in Examples 4 and 5 is increased (10 parts by weight in Example 4 and 20 parts by weight in Example 5), the effect is reduced. Is even better.

The results of Table 1 clearly show that the effects are clearly improved without comparing these Examples 4 and 5 with Conventional Example 1, Conventional Example 2, and Comparative Example.

Next, Examples 6 and 7 are compared with Conventional Example 2 and Comparative Example. In both Examples 6 and 7, the epoxidized soybean oil was blended into the support 2, and the adhesive 4 was blended with a benzimidazole-based antioxidant in addition to the benzimidazole-based antioxidant. Further, in Conventional Example 2 and Comparative Example, neither epoxidized soybean oil was blended in the support 2, and in Conventional Example 2, a benzimidazole-based antioxidant was added to the adhesive 4 in addition to the phenol-based antioxidant. In the comparative example, instead of the phenolic antioxidant, only the benzimidazole antioxidant is added to the antioxidant of the pressure-sensitive adhesive 4. As is clear from the results in Table 1, when Example 6 and Conventional Example 2 were compared, Example 6 and Conventional Example 2 were compared.
Is that 2 parts by weight of epoxidized soybean oil is mixed with the support having the composition of Conventional Example 2. Comparison between Example 6 and Conventional Example 2 reveals that
In the discoloration evaluation of the PVC film by a weatherometer, the discoloration was caused after 60 hours in the conventional example 2, whereas the discoloration was not caused even in 60 hours in the example 6;
It can be seen that the color changed after r, and the effect was improved. Moreover, even in the evaluation of discoloration of the PVC film by an 80 ° C. air oven, Example 6 does not cause discoloration even after 12 days. On the other hand, in Conventional Example 2, no discoloration occurs after 10 days, but discoloration occurs even after 12 days.
It can be seen that the effect has been improved.

Further, comparing Example 6 with Conventional Example 2, the evaluation of adhesive cohesive failure of the adhesive by Sunshine Weathero Meter showed that Conventional Example 2 was 6%.
After 0 hr, cohesive failure occurred.
Even after 0 hr, no cohesive failure occurred, and after 96 hr, cohesive failure occurred, indicating that the effect was improved. Furthermore, in the adhesive cohesive failure evaluation using an 80 ° C. air oven, the conventional example 2 caused cohesive failure after 12 days, whereas the example 6 did not cause cohesive failure even after 12 days, and after 16 days, Causing cohesive failure,
It can be seen that the effect has been improved. Since the performance of the comparative example is inferior to that of the conventional example 2, it is not necessary to compare the comparative example with the sixth embodiment.

Comparison between Example 7 and Conventional Example 2 shows that
As apparent from the results, the difference in composition between Example 7 and Conventional Example 2 is that 2 parts by weight of epoxidized soybean oil was blended with the support having the composition of Conventional Example 2. Comparing Example 7 with Conventional Example 2, it can be seen that exactly the same performance is obtained. Comparing the compositions of Example 7 and Conventional Example 2, the support of Conventional Example 2 does not contain epoxidized soybean oil, and the antioxidant of pressure-sensitive adhesive 4 is replaced by a phenolic antioxidant. The amount of the benzimidazole-based antioxidant to be compounded was 1.5 parts by weight in Conventional Example 2, whereas the amount of the expensive benzimidazole-based antioxidant in Example 7 was 0.5 part by weight. It can be seen that it can be significantly reduced.

[0046]

According to the present invention, as described above, 100 parts by weight of polyvinyl chloride, 50 parts by weight of a phthalate ester plasticizer, and 0.1 parts of epoxidized soybean oil are used.
-20 parts by weight (excluding 2 parts by weight), 4 parts by weight of a Pb-based stabilizer, and a vinyl chloride resin composition containing a pigment
On at least one surface of Ranaru support it by blending a phenolic antioxidant and benzimidazole antioxidants in rubber material obtained by blending a softening agent in synthetic rubber and natural rubber
That order and the adhesive are constituted by applying, varying the support with a decrease cohesion of heat by the adhesive can be prevented
Color can be suppressed for a longer period .

[0047]

[0048]

[0049]

[0050]

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an adhesive tape according to the present invention.

FIG. 2 is a front view of the adhesive tape shown in FIG.

FIG. 3 is a view showing a structure of a conventional adhesive tape.

FIG. 4 is a view showing a conventional method for producing an adhesive tape.

FIG. 5 is a view showing a conventional method for producing an adhesive tape.

[Explanation of symbols]

1 …………………………………………………
…… Adhesive tape 2 …………………………………………………
… Support 3 ……………………………………………………
…………………………………………………………………
…… Adhesive 5 ………………………………………………
……Primer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C09J 7/00-7/04 C09J 11/06

Claims (1)

(57) [Claims] 1. 100 parts by weight of polyvinyl chloride, 50 parts by weight of a phthalate ester plasticizer, and 0.1 parts of epoxidized soybean oil.
1 to 20 parts by weight (excluding 2 parts by weight), 4 parts by weight of a Pb-based stabilizer, and a vinyl chloride resin composition containing a pigment
On at least one surface of a support consisting of, by blending the phenol-based antioxidant and benzimidazole antioxidants in rubber material obtained by blending a softening agent in synthetic rubber and natural rubber
Adhesive tape, characterized in that an adhesive constituted by coating consisting.