JP2013010879A - Supporting body for pressure-sensitive adhesive tape, and pressure-sensitive adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supporting body for a pressure-sensitive adhesive tape formable of a pressure-sensitive adhesive tape that can be cut with excellent hand-cuttability, is excellent in workability in cutting work, and is further excellent in strength in a longitudinal direction, and hence is not cut during rewinding (in use) of the pressure-sensitive adhesive tape, and is excellent in workability in rewinding.SOLUTION: The supporting body for the pressure-sensitive adhesive tape includes a polyolefin-based resin film whose at least one side of the surfaces has a concavity groove-shaped in width direction, and the bottom surface of the concavity is a curved surface having a curvature part R whose magnitude is 0.1-2, a maximum width of the concavity is 50-500 μm, and the number of the concavities is 200-2,000 pieces/m, wherein R=r/D, R: the curvature part, r: the curvature radius of the bottom surface of the concavity, and D: the depth of the concavity.

Description

  The present invention relates to an adhesive tape support. More specifically, the present invention relates to an adhesive tape support having excellent hand cutting properties and excellent strength in the length direction, and an adhesive tape in which the adhesive tape support is used.

  Conventionally, for transporting, processing, and curing metal plates, painted metal plates, so-called “aluminum sashes”, resin plates, decorative steel plates, laminated steel plates made of vinyl chloride resin, glass plates, etc., for surface protection As surface protection tapes or sheets for applications to be pasted, detachable adhesive tapes or sheets (“adhesive tapes or sheets” are collectively referred to as “adhesive tapes”) are used. In the above-described removable adhesive tape, a cutting method using a cutting tool such as scissors or a knife is frequently used at the time of affixing operation. However, when the adhesive tape is cut by a cutting method using a cutting tool, the adherend may be damaged by the cutting tool. Therefore, an adhesive tape that can be easily and safely cut with excellent workability is required. However, if the cutting property of the adhesive tape is improved, the adhesive tape may be cut against the operator's intention, resulting in a tape with very poor workability.

  Examples of the re-peelable pressure-sensitive adhesive tape include a pressure-sensitive adhesive tape in which a concavo-convex process has been applied to a support base so that it can be easily cut with a bare hand during affixing operation (see Patent Document 1). As shown in FIG. 1, this adhesive tape has a tape support having a V-shaped groove-like recess in the width direction.

Japanese Patent No. 2694854

  About the cutting property of the tape support in the pressure-sensitive adhesive tape in which the support having an unevenness is used, the shape of the recess has an influence, and in particular, a tape support having a V-shaped groove-like recess in the width direction ( In an adhesive tape including a tape support that has a sharp portion that does not substantially have a curved surface in a concave portion (see FIG. 1), when a tensile force is applied in the length direction of the adhesive tape, the location where the force is applied There is a problem that the force concentrates on the adhesive tape and the adhesive tape breaks with a little force. In particular, it becomes a problem when the adhesive tape is rewound.

Therefore, the object of the present invention is to cut with excellent hand cutting properties, good workability at the time of cutting, excellent strength in the length direction, and cutting when the adhesive tape is rewound (during use). It is providing the support body for adhesive tapes which can form the adhesive tape which is excellent in the unwinding workability | operativity (adhesive tape feeding workability | operativity) of an adhesive tape.
Furthermore, another object of the present invention includes the above-mentioned support for adhesive tape, can be cut with excellent hand cutting properties, has good workability at the time of cutting, and further has excellent strength in the length direction. An object of the present invention is to provide a pressure-sensitive adhesive tape that is not cut when it is rewound (during use) and is excellent in rewinding workability of the pressure-sensitive adhesive tape (adhesion workability of the pressure-sensitive adhesive tape).

  As a result of intensive studies to achieve the above object, the present inventors have used a pressure-sensitive adhesive tape support having a specific groove-shaped recess at a specific ratio as a pressure-sensitive adhesive tape support made of a polyolefin resin film. Adhesive that can be cut with excellent hand cutting properties, and has good workability at the time of cutting, and even when it is rewound at a low temperature, the adhesive tape can be easily fed out without breaking in the middle. The inventors found that a tape was obtained and completed the present invention.

That is, the present invention is an adhesive tape support made of a polyolefin resin film, having a groove-shaped recess in the width direction on at least one surface, and the bottom surface of the recess has a size of the following curved portion R. Provided is a pressure-sensitive adhesive tape support having a curved surface of 0.1 to 2, a maximum width of the recesses of 50 μm to 500 μm, and a number of recesses of 200 to 2000 / m.
R = r / D
R: Curved portion r: Radius of curvature at the bottom of the recess D: Depth of the recess

  In the said support for adhesive tapes, it is preferable that the thickness of the said support for adhesive tapes is 50-200 micrometers, and the depth of the said recessed part is 20-80% of the thickness of the said support for adhesive tapes.

  Furthermore, this invention provides the adhesive tape characterized by the adhesive layer being provided in the at least single side | surface side of the said support body for adhesive tapes.

  The support for pressure-sensitive adhesive tapes of the present invention comprises a polyolefin resin film and has specific groove-shaped recesses at a specific ratio, so it can be cut with excellent hand cutting properties (property that can be easily cut in the width direction by hand). , Good workability at the time of cutting, and excellent strength in the length direction, without cutting when the adhesive tape is rewound (during use), and unwinding workability of the adhesive tape (adhesion of the adhesive tape) An adhesive tape having excellent workability can be formed.

FIG. 1 is a schematic cross-sectional view in the length direction showing an example of a tape support. FIG. 2 is a schematic top view partially showing an example of the pressure-sensitive adhesive tape support of the present invention. FIG. 3 is a schematic cross-sectional view in the length direction partially showing an example of the support for adhesive tape of the present invention. FIG. 4 is a schematic external view partially showing an example of the pressure-sensitive adhesive tape support of the present invention. FIG. 5 is a schematic cross-sectional view in the length direction partially showing an example of the pressure-sensitive adhesive tape of the present invention. FIG. 6 is an electron micrograph of the surface of the pressure-sensitive adhesive tape support of Example 1 having a recess. FIG. 7 is an electron micrograph of a surface having a recess of the support for an adhesive tape of Example 1. FIG. 8 is an electron micrograph of a longitudinal section of the adhesive tape of Example 1.

(Support for adhesive tape)
The support for adhesive tapes of this invention is a support for adhesive tapes which consists of a polyolefin-type resin film and has a groove-shaped recessed part in the width direction in the at least one surface of this polyolefin-type resin film. The “width direction” is the width direction of the support for adhesive tape. In the present application, the “groove-shaped recess” may be simply referred to as “recess”. Further, “adhesive tape or sheet” may be collectively referred to as “adhesive tape”.

  Embodiments of the present invention will be described below in detail with reference to the drawings as necessary. Although it does not specifically limit as a form of the support body for adhesive tapes of this invention, As an example, the support body for adhesive tapes shown in FIG.2 and FIG.3 is mentioned. FIG. 2 is a schematic top view partially showing an example of the support for adhesive tape of the present invention, and FIG. 3 is a schematic cross-sectional view in the length direction partially showing an example of the support for adhesive tape of the present invention. It is. 2 and 3, 1 is a support for an adhesive tape, and 2 is a recess. Further, w is the width of the recess, L is the pitch interval of the recess, D is the depth (maximum depth) of the recess, and h is the thickness (maximum thickness) of the support for adhesive tape. Furthermore, X is the length direction of the support for adhesive tapes, and Y is the width direction of the support for adhesive tapes.

  The said adhesive tape support body (FIG. 2, FIG. 3) has a surface which has a recessed part on one surface, and has a smooth surface on the other surface. Moreover, in the surface which has the recessed part of the adhesive tape support body of the said preferable form, it has a groove-shaped recessed part in the linear form of the width direction. Furthermore, the width of the recesses is constant and the pitch interval of the recesses is also constant on the surface of the pressure-sensitive adhesive tape support of the preferred embodiment having the recesses. The bottom surface of the recess is curved. The number of groove-shaped recesses (recesses) in the width direction in the pressure-sensitive adhesive tape support shown in FIGS. 2 and 3 is four.

  Moreover, the support body for adhesive tapes of this invention may have a rib in a recessed part. FIG. 4 is a schematic external view partially showing an example of the support for the pressure-sensitive adhesive tape of the present invention, and shows an embodiment having ribs in the recesses. In FIG. 4, 1 is an adhesive tape support, 2 is a recess, and 3 is a rib. Moreover, X is the length direction of the support body for adhesive tapes, Y is the width direction. In addition, the number of groove-shaped recessed parts (concave parts) in the width direction in the support for adhesive tapes shown in FIG.

  The said recessed part is a groove-shaped recessed part in the width direction (width direction of the support body for adhesive tapes), The bottom face is roundish and is curving. That is, the bottom surface of the recess is a curved surface. In addition, in the support body for adhesive tapes of this invention, it is not the structure where the bottom face of the recessed part was sharp and sharp.

  On the bottom surface of the concave portion, the size of the curved portion R defined by the following formula (1) is a pressure-sensitive adhesive tape using a support for pressure-sensitive adhesive tape, and a good rewinding operation while obtaining good hand cutting properties. From the point which acquires property (drawing workability | operativity), it is 0.1-2, More preferably, it is 0.2-2, More preferably, it is 0.3-2.0.

The curved portion R is an index indicating the shape of the bottom surface of the recess. When the curved portion R is small, the shape of the bottom surface of the recess becomes sharp, and the cross-sectional shape of the recess becomes V-shaped (acute angle). On the other hand, when the curved portion R is large, the shape of the bottom surface of the recess becomes gentle. The said curved part R is calculated | required from following formula (1).
R = r / D (1)
R: curved portion r: radius of curvature of bottom surface of concave portion D: depth of concave portion (maximum depth)

  When the size of the curved portion R on the bottom surface of the recess is less than 0.1, the shape of the bottom surface of the recess becomes too sharp, and when a force in the length direction is applied to the support for the adhesive tape, the sharp portion The force concentrates on, and cutting occurs with a small force. For this reason, when tension is applied in the rewinding direction (feeding direction) at the time of rewinding the pressure-sensitive adhesive tape using the pressure-sensitive adhesive tape support, cutting frequently occurs, and the rewinding workability is reduced by the pressure-sensitive adhesive tape. Similarly, when an adhesive tape using a support for adhesive tape is attached to an adherend and used, and the adhesive tape is peeled off after use, the adhesive tape is cut and workability is reduced. If the adhesive tape is stuck to the adherend and left to stand, the adhesive strength between the adhesive tape and the adherend will increase, so it will be easier to apply longitudinal force to the adhesive tape when it is peeled off after use. . On the other hand, when the size of the curved portion R on the bottom surface of the recess exceeds 2, the shape of the bottom surface of the recess becomes too gentle, and the force in the width direction is easily dispersed. For this reason, hand cutting property falls and the workability | operativity at the time of the cutting | disconnection in an adhesive tape becomes very bad.

  The curvature radius (r) of the bottom surface of the recess is not particularly limited, but is preferably 20 to 90 μm, more preferably 30 to 90 μm from the viewpoint of obtaining sufficient strength in the length direction while obtaining hand cutting properties. . The radius of curvature (r) of the bottom surface of the recess is not particularly limited. For example, an electron micrograph of a cross section in the length direction of the support for the adhesive tape is obtained by a transmission electron microscope (TEM), and the electron microscope It is obtained by calculating an arc that matches the bottom curved surface from the photograph and calculating the radius of the arc.

  Although the depth (maximum depth) of the said recessed part is not specifically limited, 10-160 micrometers is preferable from the point which acquires sufficient intensity | strength in a length direction, acquiring hand cutting property, More preferably, it is 20-100 micrometers. .

  Furthermore, although the depth of the said recessed part is not specifically limited, 20-80% is preferable with respect to the thickness (maximum thickness) (100%) of the support body for adhesive tapes, More preferably, it is 20-50%. When the depth of the concave portion is less than 20% with respect to the thickness of the support for the pressure-sensitive adhesive tape, good hand cutting properties may not be obtained. On the other hand, when the depth of the concave portion exceeds 80% with respect to the thickness of the support for the pressure-sensitive adhesive tape, the strength in the length direction is lowered, and the rewinding workability in the pressure-sensitive adhesive tape may be lowered.

  The maximum width of the concave portion is 50 to 500 μm, preferably 50 to 300 μm, and more preferably 50 to 200 μm. The maximum width of the recess means the maximum width in the longitudinal direction of one recess on the surface having the recess of the support for adhesive tape of the present invention. When the maximum width of the concave portion exceeds 500 μm, hand cutting performance may be deteriorated. This is because even if the area of the concave portion becomes too large and a force is applied to cut the adhesive tape support, the force is dispersed. Furthermore, when the maximum width of the concave portion exceeds 500 μm, the mechanical strength of the support for the adhesive tape may be lowered. If the maximum width of the concave portion is less than 50 μm, it becomes technically difficult to form the concave portion having a bottom surface in which the size of the curved portion R is within a predetermined range, and processing for forming the concave portion is performed. In this case, it becomes very difficult to secure the depth of the recess.

  Moreover, the said recessed part may have a rib. The rib is a strut-shaped structure provided in the longitudinal direction of the adhesive tape support so as to fill a part of the recess. When the concave portion has a rib, when a force acts on the adhesive tape support, the concave portion is prevented from being deformed, and the adhesive tape support due to deformation of the concave portion is not easily cut. Can be prevented. Moreover, the strength in the longitudinal direction of the support for the adhesive tape can be increased while maintaining the hand cutting property, and the rewinding workability of the adhesive tape can be improved.

  The width of the rib is not particularly limited, but is preferably 50 to 500 μm, more preferably 50 to 200 μm from the viewpoint of hand cutting. Further, the number of ribs in one recess is not particularly limited, but is preferably 20 to 100 / cm, more preferably 20 to 50 / cm from the viewpoint of hand cutting. Further, the distance between the ribs (the shortest distance between the ribs in the width direction of the pressure-sensitive adhesive tape support) is not particularly limited, but is preferably 100 to 500 μm, more preferably 200 to 500 μm from the viewpoint of hand cutting.

  As for the support body for adhesive tapes of this invention, at least one surface has the said recessed part. That is, the support for the pressure-sensitive adhesive tape of the present invention may be such that only one surface of the polyolefin-based resin film has the recess, or both surfaces of the polyolefin-based resin film have the recess. May be.

  In particular, the support for pressure-sensitive adhesive tapes of the present invention preferably has the concave portion only on one surface of the polyolefin-based resin film from the viewpoint of strength in the longitudinal direction. That is, the pressure-sensitive adhesive tape support of the present invention preferably has one surface that is the surface having the recess and the other surface that is a smooth surface without the recess.

  Moreover, from the formation of the pressure-sensitive adhesive layer on the pressure-sensitive adhesive tape support, when the pressure-sensitive adhesive tape support is used for the pressure-sensitive adhesive tape, the surface on which the pressure-sensitive adhesive layer is formed in the pressure-sensitive adhesive tape support is the surface having the recess. When it exists, sufficient contact area cannot be obtained between an adhesive layer and the support body for adhesive tapes, and there exists a possibility that sufficient adhesiveness may not be obtained between an adhesive layer and the support body for adhesive tapes. Also from this, it is preferable that the support for adhesive tapes of this invention is a surface where one surface has the said recessed part, and the other surface is a smooth surface.

  The shape of one concave portion on the surface having the concave portion of the support for adhesive tape of the present invention is a shape extending in the width direction (perpendicular to the length direction). A shape extending in the width direction from one end of the direction to the other end is preferable.

  The shape of such a recess is not particularly limited, and examples thereof include a linear shape, a zigzag line shape, a wave shape, and a curved shape. Among these, a straight line shape is preferable from the viewpoint of hand cutting.

  Moreover, although the pitch interval of the recessed part in the surface which has a recessed part of the support body for adhesive tapes of this invention is not specifically limited, It is preferable that it is 100-4000 micrometers, More preferably, it is 500-3000 micrometers, More preferably, 500- 2000 μm. When the pitch interval of the recesses exceeds 4000 μm, the cutting position becomes wide, and cutting may not be possible where intended, and as a result, hand cutting may be deteriorated. In addition, it is difficult from the point of workability to provide a recessed part so that the pitch interval of a recessed part may be less than 100 micrometers.

  Moreover, in the surface (one side) which has a recessed part of the support body for adhesive tapes of this invention, the number of the said recessed part is although it does not specifically limit, It is 200-2000 piece / m, Preferably it is 200-1500 piece / m. More preferably, it is 500-1500 pieces / m. The specific number of the recesses is the number of recesses extending in the width direction of the pressure-sensitive adhesive tape support on the surface of the pressure-sensitive adhesive tape support per 1 m in the length direction of the pressure-sensitive adhesive tape support. It is.

  The thickness (whole thickness, maximum thickness) of the support for adhesive tapes of this invention is 50-200 micrometers, Preferably it is 70-200 micrometers, More preferably, it is 70-180 micrometers. When the thickness is less than 50 μm, sufficient mechanical strength cannot be obtained, and cutting is likely to occur during rewinding of the adhesive tape, which may reduce the rewinding workability of the adhesive tape. On the other hand, when the thickness of the support exceeds 200 μm, the mechanical strength becomes too high and the resilience becomes strong. When the adhesive tape using the support is applied to the adherend, the adhesive tape The floating from the adherend tends to occur.

  In particular, the pressure-sensitive adhesive tape support of the present invention has a thickness of 50 to 200 μm and a depth of the concave portion of 20% to 80% of the thickness from the viewpoint of the balance between hand cutting properties and mechanical strength. Is more preferable.

  Examples of the polyolefin resin that is a material of the polyolefin resin film in the support for the pressure-sensitive adhesive tape of the present invention include polyethylene such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene, polypropylene, poly Vinyl chloride, polyvinylidene chloride, polyvinyl acetate, polystyrene, polyacetal, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-pentene copolymer, ethylene-hexene copolymer, ethylene-heptene copolymer, Examples thereof include ethylene-α-olefin copolymers represented by ethylene-octene copolymers. Furthermore, an ethylene-vinyl acetate-vinyl chloride copolymer, an ethylene-vinyl chloride copolymer, etc. are mentioned. In addition, the said polyolefin resin is used individually or in combination of 2 or more types.

  Among these, as the polyolefin resin, polyethylene (polyethylene resin) is preferable from the viewpoint of easy formation of a desired recess, and a mixed resin (mixture) in which low density polyethylene and high density polyethylene are combined is particularly preferable. That is, the polyolefin resin film particularly preferably contains low density polyethylene and high density polyethylene.

As the above-mentioned high-density polyethylene is preferably a density of 0.940 g / cm ³ or more 0.970 g / cm ³ or less, those in particular 0.950 g / cm ³ or more 0.965 g / cm ³ or less preferable. On the other hand, the low-density polyethylene preferably has a density of 0.880 g / cm ³ or more and less than 0.930 g / cm ³ , and particularly preferably 0.910 g / cm ³ or more and 0.929 g / cm ³ or less. . These densities are values measured in accordance with JIS K 7112.

  In the mixed resin of the low-density polyethylene and the high-density polyethylene, the ratio of the low-density polyethylene and the high-density polyethylene [HDPE: LDPE] is not particularly limited, but (from the viewpoint of easy formation of a desired recess, High density polyethylene and low density polyethylene (weight ratio) are preferably 10:90 to 90:10, more preferably 20:80 to 50:50.

  The polyolefin resin film may contain an additive. Content of the additive in the said polyolefin resin film is selected in the range which does not impair the effect of this invention. The polyolefin resin film may contain two or more additives.

  For example, the polyolefin resin film may contain a filler in order to improve the hand cutting property of the pressure-sensitive adhesive tape in which the support for the pressure-sensitive adhesive tape is used. Further, a filler may be included for the purpose of imparting flame retardancy, light resistance, heat resistance, heat deformability, rigidity and the like. The content of the filler in the polyolefin-based resin film is not particularly limited, but the resin constituting the polyolefin-based resin film from the viewpoint of suppressing brittle fracture at low temperatures while obtaining the effect of adding the filler. 5 weight% or less is preferable with respect to 100 weight part, More preferably, it is 1-3 weight%.

  Examples of additives other than the filler include colorants such as pigments and dyes, anti-aging agents, and plasticizers.

  The support for adhesive tapes of this invention is produced by forming the groove-shaped recessed part in the width direction in the at least one surface of a polyolefin-type resin film. A method for producing the polyolefin resin film is not particularly limited, and a known or usual method such as a melt film forming method (T-die method, inflation method) or a solution film forming method is used. The method for forming the concave portion is not particularly limited. For example, a method of transferring the shape of the concave portion by pressing a molten resin against a molding roll subjected to concave-convex engraving, or a film-formed polyolefin. The method of pressing the roll etc. which have uneven | corrugated shape on the surface of a resin film, and forming a recessed part is mentioned.

  Specifically, the support for an adhesive tape of the present invention has a T-die (T-type die) from the viewpoint of obtaining a desired recess, particularly a recess having a curved surface with a curved portion R having a predetermined size as a bottom surface. ) The sheet-like polyolefin resin in a molten state extruded from the sheet is taken up by a cooling roll having a concavo-convex sculpture (a forming roll having a concavo-convex sculpture, an embossing roll having a concavo-convex sculpture), and formed into a concave part It is preferable.

  In the above manufacturing method, the stretching process is not performed from the viewpoint of preventing deformation of the concave portion once formed. That is, the pressure-sensitive adhesive tape support of the present invention is preferably unstretched.

  The support for adhesive tapes of this invention comprises a part of adhesive tape by providing the adhesive layer at least on the single side | surface side. For this reason, the support for adhesive tapes of this invention may be surface-treated as needed. Examples of the surface treatment include physical treatment (for example, corona discharge treatment, plasma treatment, etc.) and chemical treatment (eg, undercoat treatment, etc.) for the purpose of improving adhesion to an adhesive layer and the like. . Moreover, the chemical process (For example, the back surface process (peeling process) by a back surface processing agent (release agent) etc.) aiming at the fall of the anchoring property of a support body and an adhesive layer is mentioned.

  The said surface treatment may be given only to the single side | surface of the support body for adhesive tapes of this invention, and may be given to both surfaces. For example, when producing an adhesive tape by providing an adhesive layer on one side of the support for adhesive tape of the present invention, the support for adhesive tape of the present invention is subjected to corona discharge treatment on one side, The surface may be subjected to a back surface treatment.

  In particular, the backing for the pressure-sensitive adhesive tape of the present invention is preferably subjected to a back treatment as a surface treatment. When the support for adhesive tape of the present invention is subjected to a back surface treatment, when one surface of the support is used as the support for the adhesive tape in the adhesive tape in the form of protecting the adhesive layer, the back surface treatment By making the surface on which the surface has been protected to protect the pressure-sensitive adhesive layer, the force (rewinding force) at the time of rewinding (in use) of the pressure-sensitive adhesive tape can be reduced. This is because such an adhesive tape can be easily drawn out and has excellent workability.

  Although it does not specifically limit as a back surface processing agent used for the said back surface processing, For example, a silicone type back surface processing agent, a long-chain alkyl type back surface processing agent, etc. are mentioned. In the pressure-sensitive adhesive tape in which the support for the pressure-sensitive adhesive tape having the surface subjected to the back surface treatment with the silicone-based back surface treatment agent is used, when the tape shape (rolled body shape) is used, If the surface subjected to the back surface treatment is a surface that protects the pressure-sensitive adhesive layer, the rewinding force of the pressure-sensitive adhesive tape becomes too light, and the workability may be reduced. From this point, as the back surface treatment agent, a long-chain alkyl back surface treatment agent which is a non-silicone back surface treatment agent is preferable. Moreover, a back surface processing agent is used individually or in combination of 2 or more types.

  The long-chain alkyl-based back treatment agent is not particularly limited. For example, a polymer of a long-chain alkyl acrylate having 12 or more carbon atoms; a copolymer of a long-chain alkyl acrylate and another vinyl monomer; And long-chain alkyl-modified polymers obtained by reacting long-chain alkyl components such as chain alkyl isocyanate. Examples of the copolymer of the long-chain alkyl acrylate and other vinyl monomer include, for example, a copolymer such as stearyl acrylate and acrylic acid, vinyl acetate, and acrylonitrile; a copolymer such as stearyl acrylamide, acrylonitrile, and acrylic acid; Examples thereof include copolymers of stearyl vinyl ether / acrylic acid, maleic anhydride, acrylonitrile and the like. Examples of the long-chain alkyl-modified polymer include, for example, a reaction product of cellulose, polyvinyl alcohol and the like and stearoyl chloride; a polymer having active hydrogen such as polyvinyl alcohol, partially acetalized polyvinyl alcohol, cellulose derivatives and polyester. And the like that are alkyl-modified with an alicyclic isocyanate such as the above. Further, as the long-chain alkyl-based back treatment agent, a non-silicone back treatment agent (trade name “Asioresin RA-30”, manufactured by Acio Sangyo Co., Ltd.), a non-silicone back treatment agent (trade name “Pyroyl 1010”, a trade name) Commercially available products such as “Pyroyl 1050” (both manufactured by Yushi Kogyo Co., Ltd.) are also included.

  In addition, a high boiling point solvent may be added to the back surface treatment agent in order to impart chargeability. Examples of the solvent include dimethyl sulfoxide (DMSO), N, N-dimethylformamide (DMF), N-methylpyrrolidone (NMP), and the like. In addition, the said solvent is used individually or in combination of 2 or more types.

  The amount of the solvent added to the back surface treatment agent is not particularly limited, but is preferably 0.05 parts by weight or more, more preferably 0.05 parts by weight with respect to 100 parts by weight of the back surface treatment agent. -0.5 parts by weight. If the amount added is less than 0.05 parts by weight, the amount of static electricity generated tends to increase. The solvent does not evaporate under the drying conditions in the normal adhesive tape layering process, but remains in the layer formed on the support by the back surface treatment (back surface treatment layer), taking in moisture in the air and charging by static electricity. It is thought that electric charge is leaked.

  The back treatment is performed by applying the back treatment agent on a support to form a back treatment layer. Moreover, it does not specifically limit as a coating method used in the case of application | coating, A well-known method is mentioned. For example, the back treatment may be performed by adding a polar solvent such as DMSO to a solution obtained by dissolving the back treatment agent in an organic solvent such as toluene to obtain a coating solution, and then subjecting the coating solution to a gravure. The coating is performed on a support using a coating machine such as a roll coater or an air knife coater to form a back treatment layer.

  The thickness of the back surface treatment layer formed during the back surface treatment is not particularly limited, but is preferably 0.1 to 4 μm, and more preferably 0.2 to 1 μm.

  Since the support for adhesive tapes of this invention has the groove-shaped recessed part of the width direction on at least one surface, it is excellent in the hand cutting property to the width direction, and is excellent in the workability | operativity at the time of a cutting | disconnection. Furthermore, since the bottom surface of the groove-shaped recess is a predetermined curved surface, and the maximum width of the recess and the number of recesses are within a predetermined range, the strength in the longitudinal direction is excellent, and when the adhesive tape is rewound (during use) Excellent workability without cutting. For this reason, the support body for adhesive tapes of this invention is used suitably for the adhesive tape use, especially the surface protection tape use used for the objectives, such as conveyance, a process, and curing.

(Adhesive tape)
As for the adhesive tape of this invention, the adhesive layer is provided in the at least single side | surface side of the support body for adhesive tapes of this invention. In the pressure-sensitive adhesive tape of the present invention, the term “pressure-sensitive adhesive tape” includes a sheet-like material, that is, a “pressure-sensitive adhesive sheet”.

  The pressure-sensitive adhesive tape of the present invention may be a single-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on one side of the pressure-sensitive adhesive tape support of the present invention, or both surfaces of the pressure-sensitive adhesive tape support of the present invention. It may be a double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on the side. Furthermore, in the pressure-sensitive adhesive sheet of the present invention, a release liner (separator) may be laminated on the pressure-sensitive adhesive layer in order to protect the pressure-sensitive adhesive layer.

  In particular, the pressure-sensitive adhesive tape of the present invention is a surface on which one surface has a recess and the other surface is smooth from the viewpoint of strength in the longitudinal direction and the adhesiveness between the pressure-sensitive adhesive layer and the pressure-sensitive adhesive tape support. The pressure-sensitive adhesive tape is preferably a pressure-sensitive adhesive tape provided with a pressure-sensitive adhesive layer on the smooth surface side of the pressure-sensitive adhesive tape support. In addition, the schematic sectional drawing of the length direction of the said single-sided adhesive tape which is a preferable aspect of the adhesive tape of this invention is shown in FIG.

  The pressure-sensitive adhesive (pressure-sensitive adhesive) constituting the pressure-sensitive adhesive layer (pressure-sensitive adhesive layer) is not particularly limited, and examples thereof include acrylic pressure-sensitive adhesives, rubber pressure-sensitive adhesives, vinyl alkyl ether pressure-sensitive adhesives, and silicones. System adhesives, polyester adhesives, polyamide adhesives, urethane adhesives, fluorine adhesives, epoxy adhesives and the like. Among these, acrylic pressure-sensitive adhesives are preferable from the viewpoint of heat resistance, weather resistance, and ease of polymer design. In addition, an adhesive is used individually or in combination of 2 or more types.

  The acrylic pressure-sensitive adhesive layer contains an acrylic polymer as a base polymer. Although content of the said acrylic polymer in the said acrylic adhesive layer is not specifically limited, 50 weight% or more is preferable with respect to the total weight (100 weight%) of an acrylic adhesive layer, More preferably 80% by weight or more. The acrylic pressure-sensitive adhesive layer may contain two or more types of acrylic polymers.

  The acrylic polymer is formed using a (meth) acrylic acid alkyl ester having a linear or branched alkyl group as an essential monomer component. In the present application, “(meth) acrylic acid” means “acrylic acid” and / or “methacrylic acid”, and the same applies to others.

  The (meth) acrylic acid alkyl ester having a linear or branched alkyl group is not particularly limited. For example, a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an isobutyl group, an amyl group, Isoamyl group, hexyl group, heptyl group, cyclohexyl group, 2-ethylhexyl group, octyl group, isooctyl group, nonyl group, isononyl group, decyl group, isodecyl group, undecyl group, lauryl group, tridecyl group, tetradecyl group, stearyl group, Examples include (meth) acrylic acid alkyl esters having a linear or branched alkyl group having 30 or less carbon atoms, such as an octadecyl group and a dodecyl group. Among these, (meth) acrylic acid alkyl esters having a linear or branched alkyl group having 1 to 14 carbon atoms are preferred, and ethyl acrylate, methyl methacrylate, butyl acrylate, and 2-ethylhexyl acrylate are more preferred. In addition, the (meth) acrylic-acid alkylester which has a linear or branched alkyl group is used individually or in combination of 2 or more types.

  The acrylic polymer may be formed using a copolymerizable monomer as a monomer component together with the (meth) acrylic acid alkyl ester having a linear or branched alkyl group as an essential monomer component. In addition, a copolymerizable monomer is used individually or in combination of 2 or more types.

  Examples of the copolymerizable monomer include acrylic acid, methacrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid-containing monomer, maleic anhydride and itaconic anhydride. Acid anhydride monomers such as acids; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, (meth ) Hydroxyl group-containing monomers such as 8-hydroxyoctyl acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, (4-hydroxymethylcyclohexyl) -methyl acrylate; styrene sulfone Sulfonic acid group-containing monomers such as allylsulfonic acid, 2- (meth) acrylamide-2-methylpropanesulfonic acid, (meth) acrylamidepropanesulfonic acid, sulfopropyl (meth) acrylate, (meth) acryloyloxynaphthalenesulfonic acid; And phosphate group-containing monomers such as 2-hydroxyethylacryloyl phosphate. Among these, from the viewpoint of adhesiveness and removability of the acrylic pressure-sensitive adhesive layer, carboxyl group-containing monomers and hydroxyl group-containing monomers are preferable, and acrylic acid and 2-hydroxyethyl (meth) acrylate are particularly preferable. In the present application, “(meth) acrylate” means “acrylate” and / or “methacrylate”, and the same applies to others.

  Furthermore, examples of the copolymerizable monomer include (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methylolpropane (meth) acrylamide, and the like. (N-substituted) amide monomers: (meth) acrylic acid aminoethyl, (meth) acrylic acid N, N-dimethylaminoethyl, (meth) acrylic acid t-butylaminoethyl (meth) acrylic acid alkylamino Alkyl monomers; (meth) acrylic acid alkoxyalkyl monomers such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate; N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide, N-phenylmaleimide Such as male Nitride monomers: N-methyl itaconimide, N-ethyl itaconimide, N-butyl itaconimide, N-octyl itaconimide, N-2-ethylhexyl itaconimide, N-cyclohexyl leuconacimide, N-lauryl itaconimide, etc. Examples thereof include succinimide monomers such as N- (meth) acryloyl-6-oxyhexamethylene succinimide and N- (meth) acryloyl-8-oxyoctamethylene succinimide.

  Furthermore, vinyl acetate, vinyl propionate, N-vinyl pyrrolidone, methyl vinyl pyrrolidone, vinyl pyridine, vinyl piperidone, vinyl pyrimidine, vinyl piperazine, vinyl pyrazine, vinyl pyrrole, vinyl imidazole, vinyl oxazole, vinyl morpholine, N-vinyl carboxylic acid. Vinyl monomers such as amides, styrene, α-methylstyrene, N-vinylcaprolactam; Cyanoacrylate monomers such as (meth) acrylonitrile; Epoxy group-containing acrylic monomers such as glycidyl (meth) acrylate; (meth) acrylic Polyethylene glycol acid, polypropylene glycol (meth) acrylate, methoxyethylene glycol (meth) acrylate, methoxypolypropylene glycol (meth) acrylate And the like (meth) acrylic ester monomers such as tetrahydrofurfuryl acrylate; glycol acrylic ester monomers such as.

  The proportion of the copolymerizable monomer is not particularly limited, but the (meth) acrylic acid alkyl ester 100 having the linear or branched alkyl group, which is an essential component, from the viewpoint of stability during polymerization of the acrylic polymer. 50 parts by weight or less is preferable with respect to parts by weight, and more preferably 10 parts by weight or less.

  In addition, in the acrylic polymer, a polyfunctional monomer may be used as a copolymerizable monomer component for the purpose of crosslinking treatment of the acrylic polymer. Examples of the polyfunctional monomer include hexanediol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and pentaerythritol di (meth) acrylate. , Trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, epoxy acrylate, polyester acrylate, urethane acrylate and the like. In addition, a polyfunctional monomer is used individually or in combination of 2 or more types.

  The ratio of the polyfunctional monomer is not particularly limited, but is 30% by weight based on the total amount of monomer components (100% by weight) forming the acrylic polymer from the viewpoint of stability during polymerization of the acrylic polymer. The following is preferred.

  Although the acrylic polymer is not particularly limited, for example, one or more component monomers (for example, the (meth) acrylic acid alkyl ester having a linear or branched alkyl group, the copolymerizable monomer, etc.) )) By applying an appropriate polymerization method such as a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, a suspension polymerization method, or the like.

  Further, a polymerization initiator may be used in the polymerization of the above polymerization method. For example, when applying the solution polymerization method, a thermal polymerization initiator such as 2,2′-azobisisobutyronitrile may be used.

  The weight average molecular weight of the acrylic polymer is not particularly limited, but is preferably 300,000 to 2,000,000, more preferably 400,000 to 1,500,000 from the viewpoint of adhesiveness.

  The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is formed, for example, by adding an additive to the base polymer as necessary. For example, the acrylic pressure-sensitive adhesive is formed by blending the acrylic polymer with additives as necessary. In addition, the adhesive may be comprised only from the base polymer.

  Examples of the additives include tackifiers, softeners, pigments, fillers, leveling agents, dispersants, plasticizers, stabilizers, antioxidants, UV absorbers, UV stabilizers, antiaging agents, and antiseptics. And a crosslinking agent. For example, the acrylic pressure-sensitive adhesive may contain a tackifier in the acrylic polymer. That is, the acrylic pressure-sensitive adhesive layer may contain a tackifier together with the acrylic polymer. In addition, the compounding quantity of an additive is suitably selected in the range which does not impair the effect of this invention. Moreover, an additive is used individually or in combination of 2 or more types.

  Examples of the tackifier include, for example, rosin resins other than polymerized rosin resins, terpene resins, aliphatic petroleum resins, aromatic petroleum resins, hydrogenated petroleum resins, coumarone / indene resins, styrene resins, Examples thereof include alkylphenol resins and xylene resins. Specific examples of the rosin resin include rosin, hydrogenated rosin, rosin ester, hydrogenated rosin ester, and rosin phenol resin. Examples of the terpene resin include terpene resins, terpene phenol resins, aromatic modified terpene resins, hydrogenated terpene resins, and the like. Further, the hydrogenated petroleum resin includes aromatic, dicyclopentadiene, aliphatic and the like in detail. Although the compounding quantity of the said tackifier is not specifically limited, 1-30 weight part is preferable with respect to 100 weight part of acrylic polymers, More preferably, it is 1-20 weight part. In addition, a tackifier is used individually or in combination of 2 or more types.

  Moreover, the said adhesive can also be made into the appropriate crosslinking type by an internal crosslinking system, an external crosslinking system, etc. as needed. For example, the internally crosslinked acrylic polymer can be obtained by a copolymerization method using the polyfunctional monomer, a polymerization method by irradiation with active energy rays such as ultraviolet rays and electron beams, and the like. On the other hand, an externally cross-linked acrylic polymer can be obtained by a method of blending an intermolecular cross-linking agent with an adhesive.

  Examples of the intermolecular crosslinking agent include polyfunctional isocyanate crosslinking agents, epoxy crosslinking agents, melamine resin crosslinking agents, metal crosslinking agents, metal chelate crosslinking agents, amino resin crosslinking agents, and peroxide crosslinking agents. Agents and the like. These intermolecular crosslinking agents are appropriately selected according to the type of functional group involved in crosslinking of the acrylic polymer. Although the compounding quantity of the said intermolecular crosslinking agent is not specifically limited, 0.01-10 weight part is preferable with respect to 100 weight part of acrylic polymers, More preferably, it is 0.01-5 weight part.

  Although the gel fraction of the said adhesive layer is not specifically limited, It is preferable that it is 20 to 70 weight%, and it is more preferable that it is 30 to 60 weight%. If the gel fraction of the pressure-sensitive adhesive layer is less than 20% by weight, there is a tendency that adhesive residue tends to occur when the pressure-sensitive adhesive tape is peeled off from the adherend after use. There exists a tendency for the adhesiveness to a body (for example, a floor curing sheet, a flooring, etc.) to become scarce.

The gel fraction of the pressure-sensitive adhesive layer was determined by collecting a part (about 5 g) of the pressure-sensitive adhesive layer and measuring the weight (W1), and then collecting the collected pressure-sensitive adhesive layer with ethyl acetate (a sufficient amount of ethyl acetate). For example, it was immersed in room temperature (23 ° C.) for 1 week in 100 ml), the insoluble matter after immersion was separated and dried, its weight (W2) was measured, and calculated from the following formula.
(Gel fraction of pressure-sensitive adhesive layer) (wt%) = (W2) / (W1) × 100

  Although the thickness of the adhesive layer of the adhesive tape of this invention is not specifically limited, 5-200 micrometers is preferable, More preferably, it is 5-100 micrometers.

  The pressure-sensitive adhesive tape of the present invention is formed by laminating a pressure-sensitive adhesive layer on at least one side of the pressure-sensitive adhesive tape support. The pressure-sensitive adhesive layer is formed by coating the pressure-sensitive adhesive on the pressure-sensitive adhesive tape support to form a coating layer, and heating and drying the coating layer.

  Note that a conventional coater may be used for the application. Examples of the coater include a gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, and a spray coater.

  Since the adhesive tape of this invention contains the support body for adhesive tapes of the said invention, it is excellent in the hand cutting property to the width direction, and is excellent in the workability | operativity at the time of a cutting | disconnection. Furthermore, it has excellent longitudinal strength, and is excellent in workability without being cut when the adhesive tape is rewound (during use). In addition, the adhesive tape of the present invention is excellent in strength in the longitudinal direction, is hard to cut in the longitudinal direction, and adheres the adhesive tape to an adherend, and after use, the workability when peeling the adhesive tape from the adherend is also good. Excellent. For this reason, the adhesive tape of this invention is used suitably for the surface protection tape use especially used for the objectives, such as conveyance, a process, and curing.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited by these Examples.

(Materials used)
Low-density polyethylene (1) Low-density polyethylene (trade name “Novatec LF342M”, manufactured by Nippon Polyethylene Co., Ltd.) (hereinafter sometimes referred to as “LDPE-1”)
(2) Low density polyethylene (trade name “NOVATEC LF441MD”, manufactured by Nippon Polyethylene Co., Ltd.) (hereinafter, sometimes referred to as “LDPE-2”)
High-density polyethylene (1) High-density polyethylene (trade name “Hi-Zex 2200J”, manufactured by Prime Polymer Co., Ltd.) (hereinafter sometimes referred to as “HDPE-1”)
(2) High-density polyethylene (trade name “Hi-Zex 5000SF”, manufactured by Prime Polymer Co., Ltd.) (hereinafter sometimes referred to as “HDPE-2”)
Pigment (1) White pigment (trade name “HCM1030 White”, manufactured by Dainichi Seika Kogyo Co., Ltd.)

[Example 1]
(Support for adhesive tape)
Low-density polyethylene (trade name “Novatec LF342M”, manufactured by Nippon Polyethylene Co., Ltd.) (LDPE-1) 50 parts by weight, high-density polyethylene (trade name “Hi-Zex 2200J”, manufactured by Prime Polymer Co., Ltd.) (HDPE-1) 50% by weight Parts and white pigment (trade name “HCM1030 White”, manufactured by Dainichi Seika Kogyo Co., Ltd.) were mixed (dry blended) to obtain a support composition (base composition).
The support composition was formed into a film by extrusion molding with a T-die at an extrusion temperature of 230 ° C. to obtain a film-forming film, and an embossing roll was brought into contact with one side of the film-forming film immediately after extrusion, and the film width direction Groove-shaped recesses extending in the direction were continuously formed. In addition, the formed recessed part has a rib.
The embossing roll is formed by transferring the maximum width of the recesses, the depth of the recesses, the number of recesses, the pitch interval between the recesses, the radius of curvature of the bottom surface of the recesses, and the curved portion of the bottom surface of the recesses as shown in Table 1. The concavo-convex sculpture is given so that it can be done.
After forming the recess, the film was cooled, wound up, and a film having a recess on one side was obtained. In addition, the surface on the opposite side to the surface which has a recessed part of this film is smooth.
And in order to improve the anchoring property with an adhesive layer on the smooth surface of the said film, the corona treatment was performed and the support body for adhesive tapes was obtained.

(Adhesive tape)
In a reaction vessel equipped with a thermometer, a stirrer, a nitrogen introduction tube and the like, 100 parts by weight of butyl acrylate, 2 parts by weight of acrylic acid, 0.1 part by weight of 2-hydroxyethyl acrylate, 2,2′- as a polymerization initiator 0.2 parts by weight of azobisisobutyronitrile and 100 parts by weight of toluene as a polymerization solvent were added and reacted at 60 ° C. under a nitrogen gas stream to obtain an acrylic polymer having a weight average molecular weight of 500,000. .
To the acrylic copolymer, a polymerized rosin tackifier (trade name “Harry Star KT-2”, manufactured by Harima Chemicals Co., Ltd.) and 5 parts by weight with respect to 100 parts by weight of the solid content of the acrylic polymer, Furthermore, an isocyanate-based crosslinking agent (trade name “Coronate L”, manufactured by Nippon Polyurethane Industry Co., Ltd.) is added so as to be 2 parts by weight with respect to 100 parts by weight of the solid content of the acrylic polymer. Thus, an acrylic pressure-sensitive adhesive was obtained.
The acrylic pressure-sensitive adhesive is applied to the smooth surface of the pressure-sensitive adhesive tape support subjected to corona treatment with a reverse roll coater, dried at 100 ° C. for 2 minutes, and a pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer having a thickness of 30 μm ( An adhesive tape having a length of 20 m) was obtained. In addition, the adhesive tape was wound up in roll shape around the core.
In addition, the gel fraction of the adhesive layer of an adhesive tape was 50 weight%.

[Examples 2 to 8]
The materials were mixed (dry blended) as shown in Table 1 to obtain a support composition (base material composition), and the maximum width of the recesses, the depth of the recesses, and the recesses as shown in Table 1 Except for using the number, the pitch interval of the recesses, the radius of curvature of the bottom surface of the recesses, and the embossing roll that is engraved so that the curved portion of the bottom surface of the recesses can be formed by transfer, as in Example 1. The support for adhesive tape which has a recessed part was obtained.
Next, an adhesive tape was obtained in the same manner as in Example 1.

[Comparative Examples 1-6]
The materials were mixed (dry blended) as shown in Table 1 to obtain a support composition (base material composition), and the maximum width of the recesses, the depth of the recesses, and the recesses as shown in Table 1 Except for using the number, the pitch interval of the recesses, the radius of curvature of the bottom surface of the recesses, and the embossing roll that is engraved so that the curved portion of the bottom surface of the recesses can be formed by transfer, as in Example 1. The support for adhesive tape which has a recessed part was obtained.
Next, an adhesive tape was obtained in the same manner as in Example 1.

[Comparative Example 7]
The materials were mixed (dry blended) as shown in Table 1 to obtain a support composition (base material composition), and the maximum width of the recesses, the depth of the recesses, and the recesses as shown in Table 1 Except for using the number, the pitch interval of the recesses, the radius of curvature of the bottom surface of the recesses, and the embossing roll that is engraved so that the curved portion of the bottom surface of the recesses can be formed by transfer, as in Example 1. The support for adhesive tape which has a recessed part was obtained.
Next, an adhesive tape was obtained in the same manner as in Example 1.
In Comparative Example 7, when a pressure-sensitive adhesive tape support having a recess was obtained, the recess could not be formed stably.

In the examples and comparative examples, the maximum width of the recesses, the pitch interval between the recesses, and the number of the recesses were obtained from an electron micrograph of the surface having the recesses of the support for the adhesive tape. The maximum depth (D) of the concave portion was obtained from a photograph of the cross section taken by taking an electron micrograph of a cross section in the length direction of the adhesive tape. Further, the radius of curvature (r) of the bottom surface of the concave portion is obtained by reading a photograph of the cross section from the electron micrograph of the cross section in the length direction of the adhesive tape by CAD, and calculating an arc that matches the curved surface of the bottom portion of the concave portion. I asked for it. And the curved part R of the bottom face of a recessed part was calculated | required from following formula (1).
R = r / D (1)
R: Curved portion at the bottom of the recess r: Radius of curvature at the bottom of the recess D: Depth of the recess (maximum depth)

About Example 1, the electron micrograph of the surface which has a recessed part of the support body for adhesive tapes was shown in FIG.6 and FIG.7, and the electron micrograph of the longitudinal direction cross section of the adhesive tape was shown in FIG. 6-8, 1 is a support body for adhesive tapes, 2 is a recessed part, 3 is a rib, 4 is an adhesive layer, 5 is an adhesive tape. Further, w is the width of the recess, L is the pitch interval of the recess, D is the depth of the recess, r is the radius of curvature of the bottom surface of the recess, and h is the thickness of the support for the adhesive tape. Furthermore, X is the length direction, and Y is the width direction.
6 and 7, the pitch interval L of the recesses is 1000 μm, the width w of the recesses is 200 μm, and the distance between the ribs is 370 μm.

  In addition, as an electron microscope, the apparatus name "Hitachi scanning electron microscope S-3200N" (made by Hitachi High-Technologies Corporation) was used.

  The “depth of recess (%)” in Table 1 is a ratio to the thickness (100%) of the support.

(Evaluation method)
About the adhesive tape obtained by the Example and the comparative example, the hand cutting property and workability | operativity were evaluated with the following evaluation method. The evaluation results are also shown in Table 1.

(Evaluation method for hand cutting)
A sample for evaluation having a width of 50 mm and a length of 50 mm was obtained from the adhesive tape.
In an atmosphere of 23 ° C., one end in the width direction of the sample for evaluation is pinched with the fingertips of both hands so that the distance between the fingertips is 5 to 10 mm. Then, the sample for evaluation was torn in the width direction by hand, and the ease of cutting of the sample for evaluation at that time was evaluated by the following evaluation criteria.
Evaluation criteria for hand cutting property Good (○): Can be easily cut Poor (×): Cannot be easily cut

(Evaluation method for workability (rewinding workability))
An evaluation sample was obtained with an adhesive tape having a width of 50 mm.
Based on JIS Z 0237, the sample for evaluation was rewound at a speed of 30 m / min, and the workability of the adhesive tape was evaluated according to the following evaluation criteria depending on whether or not cutting occurred during rewinding.
Workability evaluation criteria Good (O): Cut when rewinding.
Defective (x): not cut at the time of rewinding It can be evaluated that the pressure-sensitive adhesive tape can be easily fed out when no cutting occurs at the time of rewinding.

DESCRIPTION OF SYMBOLS 11 Adhesive tape support body 12 Recess 1 Adhesive tape support 2 Recess 3 Rib 4 Adhesive layer 5 Adhesive tape w Recess width L Recess pitch interval D Recess depth r Radius curvature radius of recess bottom h Adhesive tape support Body thickness X Length direction Y Width direction

Claims (3)

A support for an adhesive tape comprising a polyolefin resin film, having a groove-like recess in the width direction on at least one surface, and the bottom surface of the recess has a size of the following curved portion R of 0.1 to 2 A support for pressure-sensitive adhesive tapes, which is a curved surface, has a maximum width of the recesses of 50 μm to 500 μm, and a number of the recesses of 200 to 2000 / m.
R = r / D
R: Curved portion r: Radius of curvature at the bottom of the recess D: Depth of the recess   The support for adhesive tapes of Claim 1 whose thickness of the said support for adhesive tapes is 50-200 micrometers, and the depth of the said recessed part is 20-80% of the thickness of the said support for adhesive tapes.   A pressure-sensitive adhesive tape, wherein a pressure-sensitive adhesive layer is provided on at least one side of the pressure-sensitive adhesive tape support according to claim 1.