JP2023023072A - Base material for tape and adhesive tape - Google Patents

Abstract

To provide a base material for a tape that can properly adhere not only on a flat surface, but also on a curved surface, an uneven surface or a rough surface, moreover is difficult to generate peeling or floating at an edge portion even after adhesion, can readily peeled when peeling, and is usable for an adhesive tape easy to adhere or replace and an adhesive tape.SOLUTION: A substrate for a tape made of a synthetic resin used by having an adhesive layer provided on at least one surface, wherein the substrate for a tape has a length of 80 mm and a width of 25 mm, which is bent into a loop, loop stiffness that is the load value when the base material for a tape bent into a loop with an indenter into a diameter direction of the loop at an indentation speed of 3.3 mm/s, and loop stiffness that is the load value when the diameter in the indentation direction of the loop is 10 mm is 10 to 200 mN/25 mm.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a tape substrate and an adhesive tape which are used with an adhesive layer provided on at least one surface.

Doorknobs, handrails, etc. of housing complexes, hospitals, etc., rooms, toilets, etc., are used frequently and are easily soiled by an unspecified number of people, and tend to be unfavorable in terms of appearance and hygiene. Met.
Therefore, a method is known in which an adhesive tape having antifouling or antibacterial properties is attached to such easily soiled parts. When the adhesive tape becomes dirty, it can be replaced with a new one.
For example, Patent Document 1 discloses a film in which a coating composition is applied to the surface of a film substrate to form a hydrophilic layer having functionality such as antifouling and antibacterial properties, and an adhesive layer is formed on the other surface. It is

JP-A-2000-309068

On the other hand, a portion such as a doorknob that is easily soiled may have not only a flat surface but also a curved surface, an uneven surface, a rough surface (wall surface with a rough sandy finish), and the like. Such a curved surface, uneven surface or rough surface is a surface on which the adhesive tape is difficult to attach. If the film is made too soft, the film stretches and cannot be easily peeled off.

On the other hand, the film disclosed in Patent Document 1 only states that it can be attached to any base material, and does not adequately deal with curved, uneven or rough surfaces.

The present invention has been made to solve the above-mentioned problems, and is capable of appropriately adhering not only to a flat surface but also to a curved, uneven or rough surface, and prevents peeling or lifting of the edges after application. To provide a base material for a tape and an adhesive tape which can be used for an adhesive tape which is hardly generated, can be easily peeled when peeled off, and can be easily pasted or re-pasted.

The present inventors have found that by paying attention to the physical properties of the tape base material, it is possible to obtain a tape base material that can appropriately adhere not only to flat surfaces but also to curved, uneven or rough surfaces.

The present invention was made based on such findings, and the gist thereof is as follows.
(1) A tape substrate made of a synthetic resin and used with an adhesive layer provided on at least one surface,
A tape substrate bent into a loop with a length of 80 mm and a width of 25 mm was crushed with an indenter at a speed of 3.3 mm/s in the diameter direction of the loop, and when the diameter of the loop in the direction of pushing became 10 mm, A base material for a tape, characterized by having a loop stiffness of 10 to 200 mN/25 mm, which is an applied load value.
(2) The base material for tape has a multi-layer structure of two or more layers, and at least the outermost layer on the side opposite to the side on which the adhesive layer is provided contains a functional additive (1). A base tape for the described tape.
(3) Synthesis in which the content of antioxidant is less than 0.2 parts by mass based on 100 parts by mass of the synthetic resin forming each layer, and the content of lubricant is forming each layer in the base material for the tape. The substrate for tape according to (1) or (2), which is less than 0.2 parts by mass with respect to 100 parts by mass of the resin.
(4) The tape substrate according to any one of (1) to (3), wherein the total light transmittance of the tape substrate is 50% or more.
(5) The tape substrate according to any one of (2) to (4), wherein the functional additive is an antibacterial agent or an antiviral agent.
(6) An adhesive tape comprising an adhesive layer provided on at least one surface of the tape substrate according to any one of (1) to (5).

According to the present invention, it is possible to appropriately adhere not only to a flat surface but also to a curved surface, an uneven surface, or a rough surface. It is possible to provide a base material for a tape and an adhesive tape that can be used for an adhesive tape that is easy to wear and replace.

Further, in the present invention, if the base material for tape has a multilayer structure of two or more layers and the outermost layer contains a functional additive, the tape base material can satisfactorily exhibit the function of the additive. can provide. In particular, it is preferable to use an antibacterial agent or an antiviral agent as the functional additive.

The present invention will be described in detail below.
It is a base material for tape made of a synthetic resin which is used with an adhesive layer provided on at least one surface, and the base material for tape may have a multi-layer structure of two or more layers.

Synthetic resins that make up the base material for the tape include polyvinyl chloride resins, polyolefin resins, acrylic resins, polyurethane resins, silicone resins, styrene elastomers such as polystyrene elastomers, and olefins such as polyethylene elastomers and polypropylene elastomers. Polyurethane elastomers such as elastomers, polyurethane elastomers, thermoplastic elastomers such as PVC elastomers, polyester elastomers, and nylon elastomers. can be preferably used.
Polyolefin-based resins include homopolypropylene, propylene-based copolymers such as block, random, and graft-based copolymers containing ethylene as a copolymerization component, and ethylene-based copolymers such as low-density, high-density, linear low-density, and ultra-low-density. Polymer, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-methacrylic acid copolymer Polymers, ethylene-based copolymers such as ethylene-methyl methacrylate copolymer, and the like.
The tape substrate of the present invention has a length of 80 mm and a width of 25 mm, and is bent into a loop shape. The loop stiffness, which is the applied load value when the diameter of the core is 10 mm, should be 10 to 200 mN/25 mm.

When the tape substrate layer has a multi-layered structure of two or more layers, each layer may be made of the same resin or different resins. In the case of a multilayer structure, the layer ratio of each layer is appropriately set according to the resin to be used and the purpose of use as a tape base material.
Even when the tape substrate of the present invention has a multilayer structure, the tape substrate bent into a loop with a length of 80 mm and a width of 25 mm is crushed with an indenter at a speed of 3.3 mm/s in the diameter direction of the loop. , the loop stiffness, which is the applied load value when the diameter of the loop in the pushing direction is 10 mm, can be used if it is 10 to 200 mN/25 mm.

When the tape base layer has a multi-layered structure of two or more layers, at least the outermost layer on the side opposite to the side on which the adhesive layer is provided may contain various functional additives. Examples of functional additives include ultraviolet absorbers, heat shields, flame retardants, conductive agents, antistatic agents, antibacterial agents, antifungal agents, and antiviral agents.
At this time, the thickness ratio between the outermost layer containing various functional additives and the other layers is preferably 1/50 to 1/2. When the layer ratio is less than 1/50, the thickness of the outermost layer is thin and the effect of the functional additive becomes difficult to manifest.

If an antibacterial or antiviral agent is used as a functional additive, it can be easily attached to an object to which antibacterial or antiviral properties are to be imparted, and can be easily reapplied and reattached. It is possible to obtain an adhesive tape that exhibits viral properties, and it can be used as a sanitary tape base material that can be used for doorknobs and handrails in hospitals and the like.

The content of the functional additive is appropriately set according to the type of functional additive used and the application of the tape base material. For example, when an antibacterial agent is used as a functional additive, the content of the antibacterial agent is 0.3 to 20 parts by weight with respect to 100 parts by weight of the synthetic resin that constitutes the layer containing the functional additive. is preferred.
If it is less than 0.3 parts by mass, the antibacterial properties tend not to be sufficiently exhibited, and if it exceeds 20 parts by mass, the desired loop stiffness cannot be obtained, or the antibacterial properties are not further improved and is wasted. turn into.

Synthetic resin moldings sometimes contain antioxidants to prevent thermal deterioration during molding, and lubricants to improve the workability of the moldings.
However, when an antioxidant or a lubricant is added to the base material for tape, the antioxidant or lubricant may migrate to the surface of the base material for tape over time, which may cause contamination.
Further, when the base material for tape has a multi-layer structure of two or more layers, if functional additives are contained in at least the outermost layer on the side opposite to the side on which the adhesive layer is provided, antioxidants and lubricants are added. Migration to the surface may inhibit the effect of the functional additive.
Therefore, the content of the antioxidant in the tape substrate is less than 0.2 parts by mass with respect to 100 parts by mass of the synthetic resin that constitutes each layer, and the content of the lubricant is 100 parts by mass of the synthetic resin that constitutes each layer. It is preferably less than 0.2 parts by mass per part.
By not containing antioxidants and lubricants, or by minimizing the contents, the effects of functional additives are maximized.

The tape substrate of the present invention has a length of 80 mm and a width of 25 mm, and is bent into a loop shape. The loop stiffness, which is the applied load value when the diameter of the core is 10 mm, is 10 to 200 mN/25 mm, preferably 20 to 100 mN/25 mm.
If the loop stiffness value is less than 10 mN/25 mm, the adhesive tape loses stiffness when used as an adhesive tape, and the tape stretches when re-applied and re-applied, making it difficult to peel off. On the contrary, if the value of the loop stiffness exceeds 200 mN/25 mm, the pressure-sensitive adhesive tape becomes hard and poor in followability, making it difficult to adhere to uneven or curved surfaces.

In the case where the tape base material has a multilayer structure of two or more layers and contains a functional additive in at least the outermost layer on the side opposite to the side on which the adhesive layer is provided, the layer to which the functional additive is added and the other substrate layers is preferably 1:2 to 1:50, and the total thickness of the tape substrate is preferably 0.02 to 0.2 mm.
If the layer ratio and the total thickness are within the above ranges, the effect of the functional additive contained in the layer to which the functional additive is added is sufficiently expressed, and the effect can be obtained with the minimum amount added. becomes possible.

It is preferable that the tape substrate of the present invention has transparency. If it has transparency, it can be used without spoiling the appearance of the object to which it is attached.
The transparency of the present invention is preferably 50% or more, more preferably 65% or more, in total light transmittance measured with a haze meter according to JIS K 7361.

An adhesive layer may be provided on the tape substrate of the present invention. The adhesive layer is not particularly limited as long as it can be fixed to the object to be stuck, and is generally used for adhesive tapes and adhesive sheets. Silicone resins, urethane resins, acrylic resins, rubber It is composed of a known adhesive such as a system resin.
The adhesive strength of the adhesive layer is such that if the peel strength measured in accordance with JIS Z 0237 is 3 to 30 N / 25 mm against the SUS plate, it has adhesive strength and the glue of the adhesive layer is applied when re-pasted or replaced. I have no rest.

The molding method for integrating the tape substrate and the adhesive layer of the present invention is not particularly limited. In the case of a multi-layered structure having two or more material layers, a tape substrate obtained by co-extrusion of a layer to which a functional additive has been added in advance and other substrate layers may be provided with an adhesive layer and molded.

EXAMPLES The present invention will be specifically described below with reference to Examples, but the present invention is not limited to these Examples.

<Examples 1 to 13, Comparative Examples 1 to 3>
According to the compounding recipe shown in Table 1, a tape substrate having a two-layer structure consisting of a substrate layer and a functional layer was molded by a T-die extrusion method using a flat rubber roll. Table 1 shows the total thickness of the resulting tape substrate.
Next, an adhesive layer made of an acrylic resin (manufactured by Toagosei Co., Ltd., trade name "Arontac S-1601") was formed on one side of the obtained tape substrate by a coating method to obtain an adhesive tape.
In addition, the unit of the numerical value shown in the base material layer and the functional layer in Table 1 is "parts by mass".

In the table:
・PP polypropylene, Novatec EG6G (manufactured by Japan Polypropylene Corporation)
・ PE polyethylene, Sumikasen L705 (manufactured by Sumitomo Chemical Co., Ltd.)
- EVA1 ethylene-vinyl acetate copolymer (VA = 10% by weight),
UBE Polyethylene V210 (manufactured by Ube Maruzen Polyethylene Co., Ltd.)
- EVA2 ethylene-vinyl acetate copolymer (VA = 33% by weight),
Everflex EV170 (manufactured by DuPont Mitsui Polychemicals)
・Antibacterial agent Bactekilar BM-102MT (manufactured by Fuji Chemical Co., Ltd.)
・ Antioxidant ADEKA STAB AO-50 (manufactured by ADEKA)
・Lubricant Erucamide

The adhesive tapes obtained in Examples and Comparative Examples were subjected to the following tests and evaluated. Table 1 shows the results. Note that the loop stiffness was measured for a tape substrate composed of a substrate layer and a functional layer.

<Transparency>
Based on JIS K 7361, using a haze meter (manufactured by Suga Test Instruments Co., Ltd., trade name "Haze Meter HZ-V3"), the total light transmittance was measured and evaluated according to the following criteria.
○: Total light transmittance of 65% or more △: Total light transmittance of 50% or more and less than 65% ×: Total light transmittance of less than 50%

<Loop Stiffness>
Using Loop Stiffness Tester D (manufactured by Toyo Seiki Seisakusho), a tape base material bent into a loop with a length of 80 mm and a width of 25 mm is crushed with an indenter at a speed of 3.3 mm / s in the diameter direction of the loop. , the applied load value was read when the diameter of the loop in the pushing direction was 10 mm.

<Adherability>
The following criteria evaluated the workability|operativity at the time of sticking an adhesive tape so that it may wind around a handrail with a diameter of 4 cm.
○: No peeling or lifting of the edge ×: The edge is turned up and the front surface cannot be attached, or the surface is lifted

<Peelability>
The adhesive tape was attached so as to be wrapped around a handrail with a diameter of 4 cm, and the workability when peeled off after one week was evaluated according to the following criteria.
○・・・Adhesive tape does not stretch and can be removed properly ×・・・Adhesive tape stretches and is difficult to remove

<Antibacterial properties>
A test piece having a length of 50 mm and a width of 50 mm was prepared from the obtained tape substrate, and an unprocessed test piece was prepared without adding an antibacterial agent in each example and comparative example. By the film adhesion method, using Staphylococcus aureus, the difference between the logarithmic value of the viable count of the unprocessed test piece after 24 hours and the logarithmic value of the viable count of the antibacterial processed test piece after 24 hours Antibacterial activity Values were determined and evaluated as follows. In addition, when the antibacterial activity value is 2.0 or more, it is judged that there is an antibacterial effect.
○: Antibacterial activity value of 3.0 or more △: Antibacterial activity value of 2.0 or more and less than 3.0 ×: Antibacterial activity value of less than 2.0

As can be seen from the above test results, the tape base material and the adhesive tape of the present invention can appropriately adhere not only to a flat surface but also to a curved surface, an uneven surface, or a rough surface. It was hard to generate the peeling, and it was possible to peel it off easily.
In addition, in the tape base material of the present invention, when an antibacterial agent is contained as a functional additive in the outermost layer, transparency is maintained by adjusting the content of the antioxidant and lubricant, and the content of the antibacterial agent. However, the effect of the functional additive could be exhibited.

Claims (6)

A tape substrate made of a synthetic resin and used with an adhesive layer provided on at least one surface,
A tape substrate bent into a loop with a length of 80 mm and a width of 25 mm was crushed with an indenter at a speed of 3.3 mm/s in the diameter direction of the loop, and when the diameter of the loop in the direction of pushing became 10 mm, A base material for a tape, characterized by having a loop stiffness of 10 to 200 mN/25 mm, which is an applied load value. 2. The tape according to claim 1, wherein said base material for tape has a multi-layered structure of two or more layers, and functional additives are contained in at least the outermost layer on the side opposite to the side on which the adhesive layer is provided. base tape. In the tape substrate, the content of the antioxidant is less than 0.2 parts by mass with respect to 100 parts by mass of the synthetic resin forming each layer, and the content of the lubricant is 100 parts by mass of the synthetic resin forming each layer. 3. The substrate for tape according to claim 1, wherein the content is less than 0.2 parts by mass per part. 4. The tape substrate according to any one of claims 1 to 3, wherein the total light transmittance of the tape substrate is 50% or more. The tape substrate according to any one of claims 2 to 4, wherein the functional additive is an antibacterial agent or an antiviral agent. An adhesive tape comprising an adhesive layer provided on at least one surface of the tape substrate according to any one of claims 1 to 5.