JP2001294821A - Pressure sensitive adhesive double coated tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure sensitive adhesive double coated tape exhibiting excellent positioning adjusting function, rough surface-adhesive property and unevenness- following property when the tape adheres and developing excellent adhesive force and further excellent in re-peeling property after adhesion. SOLUTION: This pressure sensitive adhesive double coated tape is characterized in that a protruded masking part composed of a non-tacky or slightly tacky material and applying parts of the surfaces of both tacky layers is formed on the surface of both tacky layers in the adhesive tape obtained by using a foam as a core material and laminating tacky agent layers on the both surfaces of the core material, and a material constituting at least either one protruded masking part is a net-like material having many opening parts and the tear strength of the material is >=5N and intersection interval thereof is 3-6 mm, or this pressure sensitive adhesive double coated tape is characterized in that protruded part composed of non-tacky or slightly tacky material is formed on a tacky agent layer surface laminated on core material surface not laminated when a thin layer sheet is laminated only on one surface in either one tacky agent layer surface of pressure sensitive adhesive double coated tape obtained by using a foam having the thin layer sheet laminated on at least one surface as a core material and laminating tacky agent layers on both surface of the core material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a double-sided pressure-sensitive adhesive tape (including a double-sided pressure-sensitive adhesive sheet).

[0002]

2. Description of the Related Art Conventionally, when an interior member for building such as a decorative board is adhered and fixed to a base material, an adhesive is used alone or disclosed in, for example, Japanese Patent Application Laid-Open No. 4-312671. As described above, an adhesive and a double-sided adhesive tape are used in combination.

However, when an adhesive is used, if the adherend becomes dirty or scratched over time and needs to be replaced, broken material of the interior member remains on the base material when peeled off. In many cases, it is necessary to perform a kelen treatment on the base material. Further, in some cases, the base material itself is destroyed, so it is necessary to replace the base material, which requires enormous man-hours.

In recent years, the use of a double-sided adhesive tape alone has been studied. However, ordinary double-sided pressure-sensitive adhesive tapes exhibit stickiness (tack) when they come into contact with the adherend and do not move, making it difficult to adjust the positioning during bonding and making it difficult to perform delicate positioning operations such as fitting and butting. Therefore, there is a problem that a gap is easily generated between the adherends and the finished appearance is impaired.

As a double-sided pressure-sensitive adhesive tape having a function of adjusting the position at the time of bonding, for example, Japanese Patent Application Laid-Open No. H11-256118, kraft paper, cloth, synthetic resin sheet or the like is used as a core material, and the pressure-sensitive adhesive layer strength on the floor material side is lower than that of the base material. There is disclosed a double-sided pressure-sensitive adhesive tape for flooring construction, which has a strength greater than the material-side pressure-sensitive adhesive layer strength. However, this double-sided pressure-sensitive adhesive tape has a problem that, since the tape is thin, it has poor adhesion to rough surfaces and poor conformability to uneven surfaces, and cannot obtain sufficient adhesive strength, and a base material having relatively small strength. There is a problem that floating and peeling from the side pressure-sensitive adhesive layer tend to occur over time.

In order to improve the adhesiveness to a rough surface and the followability to an uneven surface, for example, Japanese Patent Publication No. Sho 57-42111 discloses a double-sided adhesive having a core made of a foam reinforced on one side with a thin film. A tape is disclosed. However, this double-sided pressure-sensitive adhesive tape does not have a positioning adjustment function at the time of bonding.

Further, for example, in Japanese Patent Application Laid-Open Nos. 9-227842 and 11-343726, a masking member for providing a positioning adjustment function at the time of bonding to at least one surface of an adhesive layer using a foam as a core material. A double-sided pressure-sensitive adhesive tape on which (convex portions) are laminated is disclosed. But,
Since these double-sided pressure-sensitive adhesive tapes are made of a core material made of a low-strength foam, the core material is broken and remains on the base material when, for example, replacing an interior member for building or re-peeling after use. There is a problem that it is easy to remove broken materials by hand and to perform the above-mentioned kerane treatment.

[0008]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to exhibit an excellent positioning adjustment function and a rough surface adhesiveness or an uneven followability at the time of bonding, and an excellent adhesive force after bonding. It is an object of the present invention to provide a double-sided pressure-sensitive adhesive tape which is expressed and has excellent removability.

[0009]

The double-sided pressure-sensitive adhesive tape according to the first aspect of the present invention (hereinafter referred to as "the present invention 1") comprises a foam as a core material, and a pressure-sensitive adhesive layer laminated on both sides thereof. Is a double-sided adhesive tape, on the surface of both adhesive layers,
A convex masking portion made of a non-adhesive or slightly adhesive material covering a part thereof is formed, and a material constituting at least one of the convex masking portions is a mesh having a large number of openings. The material has a tear strength of 5 N or more and an interval between intersections of 3 to 6 mm.

Further, the double-sided pressure-sensitive adhesive tape according to the invention of claim 2 (hereinafter referred to as “the present invention 2”) has a core material of a foam in which a thin sheet is laminated on at least one surface,
On one adhesive layer surface of a double-sided adhesive tape in which an adhesive layer is laminated on both surfaces thereof, when the thin sheet is laminated on only one surface, the non-laminated core material surface A convex portion made of a non-adhesive or slightly adhesive material is formed on the surface of the laminated pressure-sensitive adhesive layer.

The foam used for the core material of the double-sided pressure-sensitive adhesive tape of the present invention (the present invention 1 and the present invention 2) includes, for example,
Polyolefin resin foam such as polyethylene resin and polypropylene resin, synthetic resin foam such as vinyl chloride resin foam, synthetic rubber foam such as butyl rubber and chloroprene rubber, and natural rubber foam Of these, a synthetic resin-based foam having an appropriate thickness and flexibility, and excellent in conformity to irregularities and workability is preferably used. These foams may be used alone or in combination of two or more.

The foam is not particularly limited, but preferably has a 50% compressive strength of 5 to 100 N / cm ² . 50% compressive strength of foam is 5N / c
If it is less than m ² , the protrusions formed on the pressure-sensitive adhesive layer, which will be described later, made of a non-tacky or slightly tacky material are easily buried in the pressure-sensitive adhesive layer with a small pressure, and the adhesive of the double-sided pressure-sensitive adhesive tape is bonded. When the foam has a 50% compressive strength of more than 100 N / cm ² , the double-sided pressure-sensitive adhesive tape may have inadequate rough surface adhesion or uneven surface conformability, or may have poor adhesion. In some cases, the convex portion formed of a non-tacky or slightly tacky material formed on the adhesive layer becomes difficult to be buried in the adhesive layer, and a sufficient adhesive force may not be obtained.

The core material used for the double-sided pressure-sensitive adhesive tape of the present invention 2 needs to have a thin sheet (including a thin film) laminated on at least one surface of the foam.

The material constituting the thin sheet is as follows:
For example, synthetic resin sheets such as polyester resins and polyolefin resins, woven fabrics, nonwoven fabrics, sheets such as nets, high-strength fiber nonwoven fabric sheets such as Manila hemp base paper and Japanese paper, etc. Sheets are preferably used.

The thin sheet is not particularly limited, but preferably has a thickness of 10 to 200 μm, a basis weight of 10 to 50 g / m ² , and a tensile strength in the longitudinal direction. The strength is preferably 50 N or more in a width of 50 mm.

If the thickness of the thin sheet is less than 10 μm or the basis weight is less than 10 g / m ² , the reinforcing effect on the foam may be insufficient, and conversely, the thickness of the thin sheet may be 200 μm. If the weight exceeds 50 g / m ² or the basis weight exceeds 50 g / m ² , the adhesiveness on the rough surface and the followability of unevenness of the double-sided pressure-sensitive adhesive tape may be insufficient. If the tensile strength in the longitudinal direction of the thin sheet is less than 50 N in a width of 50 mm, tearing or tearing may occur when the double-sided pressure-sensitive adhesive tape is peeled off again.

The method of laminating the thin sheet on the foam is as follows.
There is no particular limitation, and examples include a dry lamination method, a heat fusion lamination method, and a co-extrusion lamination method, and any lamination method may be employed.

The core material used in the double-sided pressure-sensitive adhesive tape of the present invention may be subjected to surface oxidation treatment such as corona treatment or primer coating on one or both surfaces thereof, if necessary, as long as the object of the present invention is not hindered. An easy adhesion treatment, a shaping treatment such as an embossing treatment or a mat treatment, or a surface treatment such as a printing treatment or a vapor deposition treatment may be performed.

The pressure-sensitive adhesive used in the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape of the present invention may be any of those generally used as pressure-sensitive adhesives for pressure-sensitive adhesive tapes, such as acrylic resin-based pressure-sensitive adhesives, natural rubber and synthetic rubber. Styrene-butadiene-styrene block copolymers, styrene-isoprene-styrene block copolymers and their hydrogenated block copolymer-based pressure-sensitive adhesives, ethylene-vinyl acetate copolymer-based pressure-sensitive adhesives Examples thereof include a polyvinyl ether resin-based pressure-sensitive adhesive and a silicone resin-based pressure-sensitive adhesive. Among them, an acrylic resin-based pressure-sensitive adhesive having excellent durability and weather resistance and less stain during handling is preferably used. These adhesives may be used alone or in combination of two or more. Further, the pressure-sensitive adhesive for the pressure-sensitive adhesive layer formed on one surface of the core material and the pressure-sensitive adhesive for the pressure-sensitive adhesive layer formed on the other surface may be the same pressure-sensitive adhesive,
Different adhesives may be used.

The form of these pressure-sensitive adhesives is not particularly limited, and examples thereof include solvent-type pressure-sensitive adhesives, emulsion-type pressure-sensitive adhesives, hot-melt-type pressure-sensitive adhesives, reactive-type pressure-sensitive adhesives, and photopolymerizable monomer-type pressure-sensitive adhesives. Or any other form.

These pressure-sensitive adhesives may include a crosslinking agent such as a polyisocyanate-based compound, an aziridine-based compound, a metal chelate-based compound, or a tackifier, as long as the object of the present invention is not hindered. , Coupling agents, fillers, softeners, plasticizers, surfactants, antioxidants (antiaging agents), heat stabilizers, light stabilizers, ultraviolet absorbers, coloring agents, defoamers, flame retardants, charging One or more of various additives such as an inhibitor may be added.

The pressure-sensitive adhesive layer formed on the core material is not particularly limited, but preferably has a glass transition temperature (Tg) of 10 ° C. or less. Tg of adhesive layer is 1
If the temperature exceeds 0 ° C., the adhesiveness of the double-sided pressure-sensitive adhesive tape on the rough surface, the ability to follow irregularities, and the tackiness (tack) at low temperatures may be insufficient.

The pressure-sensitive adhesive layer formed on the core material is not particularly limited.
It is preferably from 0 μm to 1 mm. When the thickness of the pressure-sensitive adhesive layer is less than 50 μm per side, the rough surface adhesiveness and irregularity followability of the double-sided pressure-sensitive adhesive tape may be insufficient, and when the thickness of the pressure-sensitive adhesive layer exceeds 1 mm per side, Even though tack (adhesion) and adhesion are no longer improved, costs can be high.

The double-sided pressure-sensitive adhesive tape according to the first aspect of the present invention has a structure in which the surface of both pressure-sensitive adhesive layers laminated on both sides of a core material (foam) is made of a non-adhesive or slightly-adhesive material that partially covers the surface. It is necessary that the masking portion is formed, and the material forming at least one of the convex masking portions is a mesh having a large number of openings.

The double-sided pressure-sensitive adhesive tape according to the second aspect of the present invention comprises a foam having a thin sheet laminated on at least one side as a core material, and a pressure-sensitive adhesive layer laminated on both sides thereof. If only one side of the foam is laminated,
It is necessary that a convex portion made of a non-adhesive or slightly adhesive material is formed on the surface of the pressure-sensitive adhesive layer laminated on the surface of the core material on which the thin sheet is not laminated.

If the material forming the convex masking portion or the convex portion is not tacky or slightly tacky but has good tackiness, it is difficult to adjust the positioning when the double-sided pressure-sensitive adhesive tape is adhered to the adherend. .

The non-adhesive or slightly-adhesive material constituting the convex masking portion or the convex portion is non-adhesive or slightly adhesive, insoluble in the adhesive layer, and has a certain degree of shape retention. Any material may be used as long as the material has, but among them, a mesh-like material is suitably used.

Examples of the non-adhesive material include natural fibers, synthetic fibers, glass fibers, metal fibers, woven materials thereof, nets, warifs, woven fabrics, and non-woven fabrics having a large number of openings. And glass beads, glass balloons, silica beads, aluminum oxide beads, synthetic resin beads, synthetic resin balloons, and the like. Examples of the slightly tacky material include, for example, various pressure-sensitive adhesives having a slight tackiness on the surface of the non-tacky material, such as rubber-based, acrylic-based, ethylene-vinyl acetate copolymer-based, and polyoxypropylene-based adhesives. And an acrylic microsphere-shaped pressure-sensitive adhesive or the like, and an acrylic microsphere-shaped pressure-sensitive adhesive itself. These non-sticky or slightly sticky materials may be used alone or in combination of two or more.

In the double-sided pressure-sensitive adhesive tape according to the first aspect of the present invention, the non-adhesive or slightly-adhesive material constituting the convex masking portion formed on at least one surface of the double-sided pressure-sensitive adhesive tape has the above-mentioned many openings. It is necessary that the tear strength be 5 N or more and the interval between the intersections be 3 to 6 mm. Here, the tear strength and the inter-interval interval mean the tear strength and the inter-interval interval measured by the following method.

[Measurement method of tear strength] A non-tacky or slightly tacky mesh material is cut into a width of 50 mm, and 100 mm in the length direction is cut from the center of the material end so as not to cut the intersection of the material. The test piece for measurement is prepared by making a notch in the hole. Next, each end of the cut of the test piece for measurement is set on the upper and lower sides of a tensile tester, and is torn into a T-shape at a tensile speed of 500 mm / min, and the tear strength is measured.

[Measurement Method of Intersection Distance] The inner dimension between the intersection points of the non-adhesive or slightly adhesive network is measured with a caliper.

If the above-mentioned tear strength of the non-adhesive or slightly-adhesive mesh is less than 5N, the composite of the convex masking portion and the adhesive layer may be broken or broken when the double-sided adhesive tape is removed again. , And remains on the base material, necessitating manual removal and kerane treatment, which hinders workability.

If the distance between the intersections of the non-adhesive or slightly-adhesive mesh is less than 3 mm, the adhesiveness (tack) and adhesive strength of the double-sided adhesive tape become insufficient, and conversely, the non-adhesive or The interval between the intersections of the slightly tacky mesh is 6
If it exceeds mm, the core material (foam) breaks, and the double-sided adhesive tape breaks, or the core material (foam) remains on the base material.

Further, the non-adhesive or slightly-adhesive mesh material is not particularly limited, but its intersection point thickness (maximum thickness) is preferably 30 to 500 μm. Intersection thickness (maximum thickness) of the mesh is 30 μm
When the thickness is less than the above, the positioning adjustment function of the double-sided adhesive tape may be insufficient. Conversely, when the intersection point thickness (maximum thickness) of the mesh material exceeds 500 μm, the adhesiveness (tack) of the double-sided adhesive tape and Adhesive strength may be insufficient.

In the double-sided pressure-sensitive adhesive tape of the present invention 1, if the convex masking portion formed on one surface thereof is made of a non-tacky or slightly-adhesive mesh having the above-mentioned characteristics. Alternatively, the convex masking portion formed on the other surface may be made of a non-adhesive or slightly adhesive material other than the mesh material.

In the double-sided pressure-sensitive adhesive tape according to the second aspect of the present invention, a foam having the thin sheet laminated on at least one side is used as a core material, but when the thin sheet is laminated only on one side of the foam, On the surface of the pressure-sensitive adhesive layer laminated on the surface of the core material on which the thin sheet is not laminated, a convex portion made of a non-adhesive or slightly adhesive material is formed.

When, for example, an interior member is adhered to a base material using the double-sided pressure-sensitive adhesive tape of the second invention, the pressure-sensitive adhesive laminated on the side of the double-sided pressure-sensitive adhesive tape on which the thin sheet of the core material is laminated By applying the layer to the base material side and applying the adhesive layer with the convex part of the double-sided adhesive tape to the interior member side, positioning adjustment at the time of adhesion is easy, and the base material is Adhesion work that does not cause trouble such as residue on the top can be performed.

The non-adhesive or slightly adhesive material forming the above-mentioned convex portion is not particularly limited, and the present invention 1
The mesh material used in the present invention may be used.
A material other than the mesh material that can be used in the above method may be used.

A convex masking portion made of a non-adhesive or slightly adhesive material other than the mesh-like material which may be formed on one adhesive layer surface of the double-sided pressure-sensitive adhesive tape of the present invention 1 or the double-sided pressure-sensitive adhesive tape of the present invention 2 The shape of the convex portion formed on the adhesive tape is not particularly limited, and may be any shape such as a dot shape (dot shape), a linear shape, a mesh shape, a lattice shape, a cross shape, or a composite shape thereof. It may be.

The convex masking portion or the convex portion is not particularly limited, but has a maximum thickness of 3 mm.
It is preferably from 0 to 500 μm. When the maximum thickness of the convex masking portion or the convex portion is less than 30 μm,
In some cases, the positioning and adjusting function of the double-sided pressure-sensitive adhesive tape is insufficient. On the contrary, if the convex masking portion or the maximum thickness of the convex portion exceeds 500 μm, the adhesiveness (tack) and adhesive force of the double-sided pressure-sensitive adhesive tape are insufficient. It may be.

The coverage of the convex masking portion in the double-sided pressure-sensitive adhesive tape of the present invention 1 or the convex portion of the double-sided pressure-sensitive adhesive tape of the present invention 2 is not particularly limited, but is 13 to 50% of the area of the pressure-sensitive adhesive layer. It is preferred that The coverage of the convex masking portion or the convex portion is 13% of the area of the pressure-sensitive adhesive layer.
%, The function of adjusting the positioning of the double-sided pressure-sensitive adhesive tape may be insufficient. Conversely, when the coverage of the convex masking portion or the convex portion exceeds 50% of the area of the pressure-sensitive adhesive layer, the double-sided pressure-sensitive adhesive tape may be insufficient. May have insufficient tackiness or adhesive strength.

In the double-sided pressure-sensitive adhesive tape of the present invention,
Regardless of the part of the double-sided pressure-sensitive adhesive tape, the convex masking part or the convex part is formed evenly and regularly over the entire length and width directions of the double-sided pressure-sensitive adhesive tape in order to exert the positioning adjustment function evenly and uniformly. Is preferred.

The double-sided pressure-sensitive adhesive tape of the present invention is produced by coating a convex masking portion or a pressure-sensitive adhesive layer having a convex portion made of a non-tacky or slightly tacky material with a double-sided release material, winding it up, and commercializing it. You.

The materials constituting the double-sided release material include:
Any material can be used as long as it can exhibit excellent flexibility and conformability to irregularities, for example, kraft paper, semi-bleached paper, high-quality paper, paper such as glassine paper, woven or nonwoven fabric, Homopolymer or copolymer of polyolefin resin such as high density polyethylene resin, linear low density polyethylene resin, high density polyethylene resin, polypropylene resin, etc.
Based on a synthetic resin film (including a synthetic resin sheet) such as a homopolymer or a copolymer of a polyester resin such as polyethylene terephthalate (PET) or polybutylene terephthalate, or a mixture thereof;
On both surfaces, for example, a silicone resin-based release agent or a long-chain alkyl group pendant graft polymer-based release agent, etc.
A double-sided release material obtained by performing a release treatment is exemplified.

When papers are used as the base material of the double-sided release material, the basis weight is not particularly limited, but is preferably 50 to 50%.
Those having a weight of 150 g / m ² are preferred. The basis weight of paper is 5
If it is less than 0 g / m ² , the release material on both sides may be torn at the time of winding or peeling, and conversely, the basis weight of the paper may be 150 or less.
If it exceeds g / m ² , the ability of the double-sided release material to follow the pressure-sensitive adhesive layer will decrease, and the pressure-sensitive adhesive layer may not be sufficiently covered.

The double-sided release material is not particularly limited, but preferably has a thickness of 70 to 150 μm. If the thickness of the double-sided release material is less than 70 μm, the material may be torn at the time of winding or peeling. Conversely, if the thickness of the double-sided release material exceeds 150 μm, the ability to follow the pressure-sensitive adhesive layer is reduced, It may not be possible to cover the layer sufficiently.

The method for manufacturing the double-sided pressure-sensitive adhesive tape of the present invention may be basically the same as the method for manufacturing a normal double-sided pressure-sensitive adhesive tape. First, the pressure-sensitive adhesive layer is transferred from the process paper onto the core material, and then the process paper is processed. The adhesive layer to be peeled to form a convex masking portion or a convex portion is exposed, and a convex masking portion or a convex portion made of a non-tacky or slightly tacky material is formed on the pressure-sensitive adhesive layer. The operation of covering the convex masking portion or the pressure-sensitive adhesive layer having the convex portion with the double-sided release material may be performed.

The process paper used in the above-mentioned production method may be a normal single-sided release paper or a single-sided release film (including a single-sided release sheet). Further, the double-sided release material itself used for coating the adhesive layer having the convex masking portion or the convex portion may be used as the process paper.

As an example of the method for producing the double-sided pressure-sensitive adhesive tape of the present invention, first, the pressure-sensitive adhesive is applied to the release surface of process paper, and if necessary, dried, cooled, irradiated with light, and the like.
An adhesive layer is formed on process paper. Next, the pressure-sensitive adhesive layer surface of the process paper having the pressure-sensitive adhesive layer formed on one surface of the core material is laminated, and the pressure-sensitive adhesive layer is transferred and laminated on one surface of the core material. Exposing the pressure-sensitive adhesive layer on which the convex masking portion or the convex portion is to be formed, and laminating the non-tacky or slightly tacky material constituting the convex masking portion or the convex portion on the pressure-sensitive adhesive layer. A convex masking portion or a convex portion is formed, and the pressure-sensitive adhesive layer having the convex masking portion or the convex portion is covered with the double-sided release material. Next, an adhesive layer and a convex masking portion are formed on the other surface of the core material by the same operation as described above (in the case of the present invention 1), or an adhesive layer is formed (in the case of the present invention 2). Case), the desired double-sided adhesive tape can be obtained by winding.

FIG. 1 is a sectional view showing an example of the double-sided pressure-sensitive adhesive tape of the present invention 1, and FIG. 2 is a cross-sectional view showing an example of the double-sided pressure-sensitive adhesive tape of the present invention 2. As shown in FIG. 1, the double-sided pressure-sensitive adhesive tape of the present invention has a foam as a core material, a pressure-sensitive adhesive layer laminated on both surfaces thereof, and a convex shape formed of a non-tacky or slightly tacky material on both surfaces. It has a configuration in which a masking portion is formed. Further, the double-sided pressure-sensitive adhesive tape of the present invention 2,
As shown in FIG. 2, a core material is a foam in which a thin sheet is laminated on at least one side, and a pressure-sensitive adhesive layer is laminated on both surfaces thereof, and further, the core material surface on which the thin layer sheet is not laminated Has a structure in which a convex portion made of a non-adhesive or slightly adhesive material is formed on the surface of the pressure-sensitive adhesive layer laminated.

As described above, the double-sided pressure-sensitive adhesive tape of the present invention 1 has a convex masking portion made of a non-tacky or slightly tacky material formed on both sides of a pressure-sensitive adhesive layer laminated on both sides of a core material. In addition, the double-sided adhesive tape of the present invention 2,
One side of the pressure-sensitive adhesive layer laminated on both sides of the core material has a convex portion made of non-sticky or slightly sticky material, so it demonstrates excellent positioning adjustment function when bonding to the adherend I do. On the other hand, the convex masking portion or the convex portion, because the core material made of the foam locally sinks when the double-sided pressure-sensitive adhesive tape is pressed against the adherend, is buried under the surface of the pressure-sensitive adhesive layer, It does not hinder the tack (tack) or adhesive strength of the double-sided adhesive tape. In addition, since the double-sided pressure-sensitive adhesive tape of the present invention 2 uses, as a core material, a foam in which a thin sheet is laminated on at least one side, for example, when an interior member is adhered on a base material, the adhesive is laminated on the thin sheet. By applying the applied pressure-sensitive adhesive layer to the base material side, not only the above performance but also particularly excellent removability is exhibited.

[0052]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

In this example, the following raw materials were used. 1. Core material (A) Polyethylene resin foam (trade name “Softlon # 1001”, thickness: 1 mm, expansion ratio: 10 times, manufactured by Sekisui Chemical Co., Ltd.) (B) Thin layer on one side of “Softlon # 1001” Sheets (trade name “Warif SS-T”, thickness: 0.1 mm, tensile strength in the longitudinal direction: 100 N / 50 mm, manufactured by Nisseki Plast Co.) (C) Thin layer sheet (trade name “Spanbond 9015”)
3 ", thickness: 0.13 mm, tensile strength in the longitudinal direction: 40N
/ 50 mm, manufactured by Unitika Co., Ltd., and the following adhesive was coated on both sides, and then laminated on one side of “Softlon # 1001”. (D) Thin layer sheet (trade name “Spanbond 9040”)
3 ", thickness: 0.27 mm, tensile strength in the longitudinal direction: 130
N / 50 mm, manufactured by Unitika Ltd.), the following adhesive was applied to both sides, and then laminated on one side of “Softlon # 1001”. Adhesive Acrylic solvent-based adhesive (trade name "SK Dyne 801"
B ", solid content: 45% by weight, 100 parts by weight of Soken Chemical Co., Ltd., and 1 part by weight of a polyisocyanate-based crosslinking agent (trade name" Coronate L45 ", manufactured by Nippon Polyurethane Industry Co., Ltd.). Material for forming the convex masking portion or convex portion (a) Trade name “ON3650” (tear strength: 6N, intersection interval: 4 mm, intersection thickness: 300 μm, coverage: 13 area%, manufactured by Nisseki Sheet Pallet System Co., Ltd.) (B) Trade name “ON5050” (tear strength: 5 N, intersection interval: 8 mm, intersection thickness: 300 μm, coverage: 5 area%, manufactured by Nisseki Sheet Pallet System Co.) (c) Trade name “Sof HN55” (tear) Strength: 3N, Intersection interval: 4 mm, Intersection thickness: 60 μm, Coverage: 49 area%, manufactured by Sekisui Chemical Co., Ltd. (d) Trade name “Sof HN77” (tear strength: 1 N, Intersection interval: 2 mm, Intersection thickness: 60 μm) (E) Trade name “ON5340” (tear strength: 14 N, intersection interval: 6 mm, intersection thickness: 500 μm, coverage: 16)
(Area%, manufactured by Nisseki Sheet Pallet System Co., Ltd.) The tear strength and the interval between the intersections in (a) to (d) are the tear strength and the interval between the intersections measured by the above method. 4. Double-sided release material Double-sided release paper (trade name “WHT80”, thickness: 100μ)
m, manufactured by San-A Chemical Co., Ltd.) Interior materials Floor finishing materials (trade name "Direct flooring accelerator", thickness:
8.5 mm x width: 303 mm x length: 1818 mm, manufactured by Daiken Kogyo Co., Ltd.) Floor base material Particle board (thickness: 20 mm x width: 910 mm
× length: 1820 mm, manufactured by Novopan Japan

(Example 1) (1) Production of double-sided pressure-sensitive adhesive tape Double-sided release paper was used as process paper, and the acrylic solvent-type pressure-sensitive adhesive was dried on one side of the process paper so that the adhesive thickness was 70 μm. After coating and drying for 3 minutes in a heating oven set at 85 ° C., the core material “Softlon # 1001”
And the pressure-sensitive adhesive layer was transferred onto the core material. Next, after forming the convex masking portion by laminating the material "ON3650" constituting the convex masking portion on the adhesive layer exposed by exfoliating the process paper, the pressure-sensitive adhesive layer having the convex masking portion is formed. A double-sided release material “WHT80” was laminated and pressed, and the pressure-sensitive adhesive layer having a convex masking portion was covered with the double-sided release material. Next, the same pressure-sensitive adhesive layer was transferred to the other surface of the core material, and a similar convex masking portion was formed. Thereafter, the film was wound into a roll to prepare a double-sided pressure-sensitive adhesive tape.

(2) Evaluation The performance (workability, adhesiveness, removability) of the double-sided pressure-sensitive adhesive tape obtained above was evaluated by the following method. The results are shown in Table 1.

Workability: FIG. 3 is a sectional view showing a method of evaluating workability. As shown in FIG. 3, one side of the double-sided pressure-sensitive adhesive tape cut into a width of 100 mm (floor base material side pressure-sensitive adhesive layer) is fitted to the floor finishing material “straight floor accelerator” in the longitudinal direction. After sticking it to the floor base material (particle board) so that it comes across the part, spread the floor finishing material on the other adhesive layer (floor finishing material side adhesive layer) of the double-sided adhesive tape and bond it Then, the gap between the ridge fitting portions in the longitudinal direction of the floor finishing material was measured. The smaller the gap interval, the better the workability, that is, the positioning adjustment function.

Adhesion: Adhesion for evaluation of workability was performed and cured at room temperature for 2 days. Next, after leaving the joined body on a hot carpet set at a medium temperature over the entire surface for 5 days, the gap between the sun fitting portions in the longitudinal direction of the floor finishing material was measured. The smaller the gap interval, the better the adhesiveness.

Removability: FIG. 4 is a sectional view showing a method for evaluating removability. After evaluating the adhesiveness, the hot carpet was removed and left at room temperature for one day. Next, the double-sided pressure-sensitive adhesive tape was re-peeled by a method as shown in FIG. 4, the re-peeling state was visually observed, and the re-peelability was determined according to the following criteria. [Judgment Criteria] ○ ‥‥ Interfacial peeling from floor base material surface and excellent removability × -1 ‥‥ A composite of convex masking part, adhesive layer and core material on floor base material Partial residue, poor re-peelability × -2 ‥‥ A broken piece of double-sided adhesive tape was left on the flooring material, and re-peelability was very poor

(Comparative Examples 1 to 3) A double-sided pressure-sensitive adhesive tape was prepared in the same manner as in Example 1 except that a convex masking portion was formed from the material shown in Table 1 on the pressure-sensitive adhesive layer on the floor base material side. Produced.

Comparative Example 4 A double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that no convex masking portion was formed on the pressure-sensitive adhesive layer.

The performance (workability, adhesiveness, removability) of the double-sided pressure-sensitive adhesive tapes obtained in Comparative Examples 1 to 4 was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0062]

[Table 1]

Example 2 In the production of a double-sided pressure-sensitive adhesive tape, the core material (B) was used as the core material and the material (E) was used as the material for the projections, and a thin sheet of the core material (B) was laminated. A double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that a convex portion made of the material (e) was formed on the other side.

Comparative Examples 5 to 8 A double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 2 except that the core materials shown in Table 2 were used. However, the double-sided pressure-sensitive adhesive tape of Comparative Example 7 did not have a thin sheet laminated as a core material.
Thus, a convex portion made of the material (e) was formed on one surface thereof. Further, the double-sided pressure-sensitive adhesive tape of Comparative Example 8 used the above-mentioned (A) in which a thin layer sheet was not laminated as a core material, and did not form a convex portion made of the material (e) on either surface.

The workability of the double-sided pressure-sensitive adhesive tapes obtained in Example 2 and Comparative Examples 5 to 8 was evaluated in the same manner as in Example 1, and the initial adhesive strength and re-peeling strength were evaluated as follows. Measured by the method. The results are shown in Table 2.

Initial adhesive strength: 25 m wide double-sided adhesive tape
m, and the adhesive layer laminated on the surface on which the thin sheet of core material is laminated is made of a stainless steel plate (SUS plate)
And a 2 kg-weight roller was reciprocated once and pressed, and the 90-degree angle peeling adhesive force after being left at room temperature for 20 minutes was measured at room temperature.

Re-peeling strength: The double-sided pressure-sensitive adhesive tape was pressed on a SUS plate in the same manner as in the case of above, and the 90-degree square peeling strength was measured at room temperature after being left in an atmosphere of 50 ° C. and 95% RH for 7 days.

[0068]

[Table 2]

[0069]

As described above, the double-sided pressure-sensitive adhesive tape of the present invention exhibits an excellent positioning adjustment function, a rough surface adhesiveness and an irregularity followability at the time of bonding, and exhibits excellent adhesive strength after bonding. As well as being excellent in removability at the time of reattachment of the adherend and after use, it is used for various on-site construction such as bonding and fixing of interior parts for construction on the base material, It is suitably used as a home-use double-sided adhesive tape.

[0070]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a double-sided pressure-sensitive adhesive tape of the present invention 1.

FIG. 2 is a cross-sectional view illustrating an example of a double-sided pressure-sensitive adhesive tape of the second invention.

FIG. 3 is a cross-sectional view showing a method for evaluating workability.

FIG. 4 is a cross-sectional view illustrating a method for evaluating removability.

Claims (2)

[Claims] 1. A double-sided pressure-sensitive adhesive tape comprising a foam as a core material and a pressure-sensitive adhesive layer laminated on both sides thereof, wherein the surface of both pressure-sensitive adhesive layers is partially non-adhesive or slightly tacky. A convex masking portion made of a material having
The material forming at least one of the convex masking portions is a mesh material having a large number of openings, the tear strength of which is 5 N or more, and the interval between intersections is 3 to 6 mm. tape. 2. A double-sided pressure-sensitive adhesive tape comprising a foam having a thin sheet laminated on at least one surface thereof as a core material and a pressure-sensitive adhesive layer laminated on both surfaces thereof,
When the thin sheet is laminated only on one side, a convex portion made of a non-adhesive or slightly adhesive material is formed on the adhesive layer surface laminated on the non-laminated core material surface. Double-sided adhesive tape.