JPH07188627A - Pressure-sensitive adhesive fabric tape - Google Patents

Abstract

PURPOSE:To obtain a pressure-sensitive adhesive fabric tape free from discoloration and a decrease in strength even on long-term exposure to sunlight and excellent in long-term sealing properties, by incorporating a specified TiO2 into the olefin resin layer of a pressure-sensitive adhesive fabric tape formed by laminating a polyolefin resin layer on one side of woven fabric and a pressure-sensitive adhesive layer on the other side thereof. CONSTITUTION:A pressure-sensitive adhesive fabric tape 1 formed by laminating a polyolefin resin layer 3 on one side of a woven fabric (e.g. woven polyester fabric) 2 and a pressure-sensitive adhesive (e.g. a rubber-base pressure-sensitive adhesive) layer 5 on the other side thereof, wherein TiO2 having a means particle diameter of 100nm or smaller and, if necessary in addition, a hindered amine light stabilizer are incorporated into the polyolefin resin layer 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth adhesive tape using a woven fabric as a base material. The present invention relates to a cloth adhesive tape having excellent long-term sealing property, which is less likely to seep out and discolor the adhesive tape, and can be peeled off cleanly at the time of peeling.

[0002]

2. Description of the Related Art Conventionally, cloth adhesive tape has been widely used mainly for packing cardboard boxes and the like. The structure is such that a polyolefin resin layer typified by polyethylene is laminated on one side of a woven fabric, and an adhesive layer is laminated on the other side. An acrylic pressure-sensitive adhesive is used as the pressure-sensitive adhesive layer, but a rubber-based pressure-sensitive adhesive is mainly used. The polyolefin resin layer is laminated as a sealing layer for preventing the leaching of the adhesive to the opposite surface of the substrate when the adhesive is applied to the cloth substrate, so as to prevent this.

[0003]

When a cardboard box or the like is sealed using the above-mentioned conventional cloth adhesive tape and exposed to sunlight for a long time, the adhesive tape may be discolored or spontaneous peeling may occur. Further, when the cloth adhesive tape is exposed to the sunlight of the roll, the laminated polyethylene and the cloth base material are separated from each other when the cloth adhesive tape is expanded for use, so-called spread peeling occurs. In addition, the cloth adhesive tape using a fiber made of a synthetic resin such as polypropylene as a base material is deteriorated by ultraviolet rays, its strength is lowered, and the tape is easily broken.

This is because the laminated polyolefin resin layer is deteriorated by the ultraviolet rays contained in the sunlight, the adhesive strength with the cloth base material is lowered, and the adhesive agent is deteriorated and deteriorated by the ultraviolet rays transmitted through the cloth base material. This is because the softening agent or the rubber component in the pressure-sensitive adhesive permeates the cloth substrate or the adherend, or the pressure-sensitive adhesive cohesively breaks.

As a countermeasure against this, an organic ultraviolet absorber or a light stabilizer is added to an adhesive or a cloth substrate. The ultraviolet absorber causes a reaction of converting light energy into heat energy, and the light stabilizer causes a reaction of inactivating generated radicals, and if these reactions continue, the effect becomes weaker with time. Therefore, deterioration of the polyolefin resin layer itself cannot be avoided.

It is known to make the substrate opaque because the deterioration reaction of the pressure-sensitive adhesive does not occur unless the pressure-sensitive adhesive transmits ultraviolet rays. Addition of about 30% of metal salts such as titanium oxide and calcium carbonate to the polyolefin resin as the base material makes it opaque and can be peeled off without causing cohesive failure even if left outdoors for one month.

However, in the case of the cloth adhesive tape, the polyolefin resin layer laminated on the cloth substrate is 50 to 100 μm.
Since there is a thickness of m, the above formulation causes high cost. Further, since the laminating layer becomes opaque, it takes time and effort for color matching when printing the entire surface or printing characters on the surface of the cloth substrate to be laminated.

Therefore, if the content of titanium oxide or calcium carbonate is reduced in order to form a transparent laminated layer, not only ultraviolet rays are easily transmitted, but also irregular reflection of ultraviolet rays is rapidly increased by titanium oxide in the laminated layer. Therefore, there is a problem that the deterioration reaction of the polyolefin resin with respect to the polymer becomes more severe.

The present invention solves the above-mentioned conventional problems and has excellent developability over time even when exposed to sunlight. Therefore, the present invention can be used for sealing cardboard boxes and the like to spontaneously peel off, exude pressure sensitive adhesive, It is an object of the present invention to provide a cloth pressure-sensitive adhesive tape which is less likely to undergo performance deterioration such as discoloration and lowering of substrate strength, and which is excellent in long-term sealing property and can be peeled off neatly without leaving an adhesive even when peeled from an adherend.

[0010]

The cloth pressure-sensitive adhesive tape of the present invention according to claim 1, wherein a polyolefin resin layer is laminated on one surface of a woven cloth and a pressure-sensitive adhesive layer is laminated on the other surface, The average particle size of the polyolefin resin layer is 1
It is characterized in that it contains titanium oxide having a thickness of 00 nm or less.

Further, the cloth pressure-sensitive adhesive tape of the present invention according to claim 2 is a cloth pressure-sensitive adhesive tape in which a polyolefin resin layer is laminated on one surface of a woven cloth and an adhesive layer is laminated on the other surface thereof. And a hindered amine light stabilizer and titanium oxide having an average particle size of 100 nm or less.

The woven cloth of the cloth adhesive tape of the present invention is made of synthetic resin fiber such as polyethylene, polypropylene, polyester, vinylon, or cellulose fiber. Examples of the polyolefin resin layer to be laminated thereon include one or a mixture of two or more of polyethylene, polypropylene, ethylene-vinyl acetate copolymer and the like.

The titanium oxide contained in the polyolefin resin layer has an average particle size of 100 nm or less,
Examples of such a material include trade name "MT-500HD" manufactured by Teika, and trade name "UF07" manufactured by Tyoxide. The average particle size as used herein is calculated by measuring the specific surface area and assuming that the titanium oxide is a sphere.

The average particle size of titanium oxide is 100 nm or less,
In particular, when the thickness is 50 nm or less, the surface activity is increased, and it may serve as a catalyst for the oxidation reaction. Therefore, surface treatment with a surface treatment agent is necessary. Surface treatment agents include lauric acid, silica,
Alumina and zirconia are known, but among them, the combined use of alumina and zirconia improves the weather resistance. These crystal structures are preferably rutile type. If the average particle size exceeds 100 nm, it blocks visible light and becomes opaque, so the average particle size must be 100 nm or less. As a result, the polyolefin resin layer is provided with transparency, and color matching can be easily performed when printing.

In the cloth adhesive tape according to claim 1,
The content of titanium oxide in the polyolefin resin layer varies depending on the thickness of the resin layer, and in order to maintain the ultraviolet shielding property and the transparency, it is 0.5 per 100 parts by weight of the polyolefin resin.
It is preferably from 10 to 10 parts by weight.

It is preferable that the surface of the above-mentioned polyolefin resin layer is subjected to a releasing treatment with a silicone-based or organic releasing agent. As the adhesive, acrylic, rubber, or hot melt type adhesives that are generally used for sealing adhesive tapes can be used. Antioxidants, antioxidants, etc. may be added to the pressure-sensitive adhesive as required.

The hindered amine light stabilizer added to the cloth pressure-sensitive adhesive tape according to claim 2 is N-having a piperidine skeleton.
N-oxy radicals (NO
.) Is for trapping the alkyl radical (R.) generated in the photoinitiating reaction of the polymer, and in the case of the present invention, the radical trapping action particularly during the photoinitiating reaction period prevents the deterioration by ultraviolet rays. Seems to be particularly effective at. Further, it is considered that the coexistence with titanium oxide synergistically increases the radical scavenging effect, and a remarkable effect which cannot be obtained by mixing only titanium oxide or calcium carbonate is obtained.

Further, ultraviolet rays are suppressed from reaching the woven fabric on which the woven fabric is laminated and the pressure-sensitive adhesive layer on the back surface of the woven fabric, and the strength of the woven fabric and the lamination strength of the woven fabric and the polyolefin resin layer are maintained, and the adhesion is improved. Deterioration of the agent layer is prevented.

The amount of the hindered amine light stabilizer added is
0.1-2 with respect to 100 parts by weight of the polyolefin resin layer
Parts by weight are preferred. If the amount is less than 0.1 parts by weight, the radical scavenging action is weak and improvement in weather resistance cannot be expected.
On the other hand, if the amount exceeds 2 parts by weight, the hindered amine light stabilizer bleeds onto the surface of the polyolefin resin and is transferred to the pressure-sensitive adhesive surface of the cloth pressure-sensitive adhesive tape formed into a roll, which may impair the pressure-sensitive adhesive property.

Also in the pressure-sensitive adhesive tape according to the second aspect, since the polyolefin resin layer laminated on the woven cloth has transparency, color matching can be easily performed in printing or the like.

[0021]

The cloth adhesive tape of the present invention according to claim 1 has a polyolefin resin layer laminated on a cloth base material and an average particle diameter of 100.
Since it contains titanium oxide having a thickness of nm or less, it suppresses the transmission of ultraviolet rays and thus has excellent weather resistance. or,
Since the polyolefin resin layer is transparent, color matching can be easily performed in printing or the like.

The cloth pressure-sensitive adhesive tape of the present invention according to claim 2 further comprises a hindered amine light stabilizer added to the polyolefin resin layer laminated on the cloth substrate, so that deterioration reaction of the polyolefin resin layer due to ultraviolet rays can be prevented. The effect is more remarkable, and the coexistence with titanium oxide suppresses the transmission of ultraviolet rays to the cloth base material and the pressure-sensitive adhesive, so that the weather resistance is further improved. Furthermore, since the polyolefin resin layer has transparency, color matching can be easily performed during printing.

[0023]

EXAMPLES Examples of the cloth adhesive tape of the present invention will now be described with reference to the drawings. (Embodiment 1) FIG. 1 is a perspective view showing an embodiment of the cloth adhesive tape of the present invention according to claim 1, and FIG. 2 is a sectional view taken along line AA in FIG. In FIG. 2, the cloth adhesive tape 1 has a polyethylene resin 100 on one side of a Tetoron woven cloth (made by Teijin Ltd.) 2.
With respect to parts by weight, titanium oxide having an average particle size of 30 nm or less obtained by treatment with alumina and zirconia (Taika MT-
500 HD) A polyethylene resin layer 3 having a thickness of 60 μm mixed with 1 part by weight is laminated, and a release agent 4 of a long chain alkyl group-containing polymer is added to the surface of the resin layer 3 at 15 cc /
It is coated with m ² .

On the other side of the Tetoron woven cloth 2, 70 parts by weight of natural rubber, 30 parts by weight of styrene-isoprene-styrene block copolymer, and 60% tackifying resin (made by Yasuhara Resin) were used.
A rubber-based pressure-sensitive adhesive 5 comprising 50 parts by weight, a softening agent (manufactured by Sun Oil Co., Ltd.) 30 parts by weight, and an antiaging agent (manufactured by Yoshitomi Pharmaceutical Co., Ltd., trade name: Yoshinox BHT) 2 parts by weight is laminated in a thickness of 50 μm.

Comparative Example 1 The same cloth adhesive tape as in Example 1 was prepared except that the polyethylene resin layer did not contain titanium oxide.

(Comparative Example 2) A cloth pressure-sensitive adhesive tape was applied as in Example 1 except that zinc oxide (manufactured by Taiyo Kagaku) was mixed in the polyethylene resin layer instead of titanium oxide.

Formability in producing the cloth adhesive tapes of the above-mentioned Example 1 and Comparative Examples 1 and 2, and appearance of the adhesive tapes after being adhered to a corrugated cardboard box and exposed for 100 hours in a weatherometer tester, The sealing property was examined. Regarding the sealing property, a spontaneous peeling state of the cloth adhesive tape was observed after the cardboard box was sealed and left outdoors for 10 days. The results are shown in Table 1.

[0028]

[Table 1]

As is clear from Table 1, the fabric pressure-sensitive adhesive tape of Example 1 had good moldability, showed no abnormality in appearance even after exposure to ultraviolet rays, and did not spontaneously peel. On the other hand, in the cloth adhesive tapes of Comparative Examples 1 and 2, discoloration and seepage of the adhesive from the side edges occurred, and spontaneous peeling of the end faces occurred.

(Example 2) The above polyethylene resin 100
In addition to the parts by weight, a hindered amine light stabilizer (trade name: Tinuvin 622LD, manufactured by Ciba Geigy)
The same cloth adhesive tape as in Example 1 was prepared except that 1 part by weight was added.

Example 3 As a hindered amine light stabilizer, a product name "Tinuvin 14" manufactured by Ciba-Geigy Co., Ltd.
The same cloth adhesive tape as in Example 2 was used except that 4 was used.

Comparative Example 3 Instead of a hindered amine light stabilizer in a polyethylene resin, a benzotriazole UV absorber (trade name: Tinuv manufactured by Ciba-Geigy) is used.
In 327) was used, and the same cloth adhesive tape as in Example 1 was used.

(Comparative Example 4) A hindered amine light stabilizer (trade name: Ti, manufactured by Ciba Geigy) was added to polyethylene resin.
Nuvin622LD) was used, and the same cloth adhesive tape as in Example 1 was prepared.

With respect to each of the cloth adhesive tapes of Examples 2 and 3 and Comparative Examples 3 and 4, the developability, releasability and sealing property were examined by the following methods. The results are shown in Table 2.

[0035]

[Table 2]

(1) Spreadability: After the cloth pressure-sensitive adhesive tape was left outdoors for about 10 days on the roll, the roll was observed from the roll. (2) Peelability: After being attached to a stainless steel plate and left outdoors for 10 days, the state of peeling was observed. (3) Sealing property: The corrugated cardboard box was sealed, and the condition after standing for 10 days outdoors was observed.

As is clear from Table 2, the samples of Examples 2 and 3 are not abnormal in any evaluation, but the samples of Comparative Examples 3 and 4 have low adhesion between the polyethylene resin layer and the cloth substrate. As a result, peeling of both occurred. Further, when peeled off from the stainless steel plate, the pressure-sensitive adhesive was peeled off from the cloth base material and remained on the stainless steel plate, and in Comparative Example 3, spontaneous peeling also occurred.

[0038]

The cloth pressure-sensitive adhesive tape of the present invention has the above-mentioned constitution, and the cloth pressure-sensitive adhesive tape according to claim 1 comprises a polyolefin resin layer laminated on a cloth substrate containing titanium oxide having an average particle diameter of 100 nm or less. Since it has transparency, color matching can be easily performed during printing. In addition, it has excellent developability over time even when exposed to sunlight, and is used for sealing cardboard boxes, etc. with little deterioration in performance such as spontaneous peeling, leaching of adhesive, discoloration, deterioration of base material strength, etc. It is an excellent one.

The cloth pressure-sensitive adhesive tape according to claim 2 is obtained by adding a hindered amine light stabilizer and titanium oxide having an average particle size of 100 nm or less to the polyolefin resin layer laminated on the cloth base material. The effect of preventing the deterioration reaction of the polyolefin resin by ultraviolet rays is more remarkable, and it has excellent weather resistance and long-term sealing property. Furthermore, the above-mentioned polyolefin resin layer is transparent and can be easily color-matched at the time of printing, so that it has great practical value.

[0040]

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a cloth adhesive tape of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

[Explanation of symbols]

 1: Adhesive tape for cloth 2: Tetoron woven fabric 3: Polyethylene resin layer 4: Release agent 5: Rubber adhesive

Claims (2)

[Claims] 1. A cloth pressure-sensitive adhesive tape comprising a woven cloth, and a polyolefin resin layer laminated on one surface thereof, and an adhesive layer laminated on the other surface thereof, wherein the polyolefin resin layer has an average particle diameter of 1
A cloth pressure-sensitive adhesive tape comprising titanium oxide having a thickness of 00 nm or less. 2. A cloth pressure-sensitive adhesive tape comprising a woven cloth having a polyolefin resin layer laminated on one side and an adhesive layer laminated on the other side, wherein the polyolefin resin layer has a hindered amine light stabilizer and an average particle size of 100 nm. A cloth adhesive tape comprising the following titanium oxide.