JP2017113948A - Release sheet and masking tape with release sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a release sheet suitable for a masking tape having excellent masking effect even when laminated by a releasing and pasting method gradually, and a masking tape with the release sheet.SOLUTION: There is provided a release sheet 11 consisting of a release substrate 21 consisting of a paper-based material, an inclusion adhesive agent layer 22, a smooth control layer 23 and a release agent layer 24 in this order, wherein the release sheet 11 has stiffness of 100 mN or more and a release surface 11a of the release sheet 11 consisting of a surface facing the smooth control layer 23 on the release agent layer 24 and an opposite side surface has arithmetic mean waviness Wa of 0.3 μm or less.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a release sheet and a masking tape provided with the release sheet. Specifically, even when the masking tape includes a release sheet having a release substrate made of a paper-based material, the adhesive layer of the masking tape is attached to the adherend. The present invention relates to a release sheet that provides a masking tape in which air bubbles are unlikely to remain on the application surface when it is attached, and a masking tape including the release sheet.

  In automobiles such as one-box cars, wagon cars, and RVs (Recreational Vehicles), a sliding door is often applied to the rear door. The slide door is opened and closed by rolling on the inner bottom surface of the slide rail while a roller provided on the back side of the slide door is guided by the slide rail attached to the body. This slide rail is a long member having an opening portion along a normal length direction, and one end portion is curved (see Patent Document 1).

  In automobile production lines, painting is generally performed after the slide rail is attached to the body. At this time, a paint film is formed on the inside of the slide rail, or paint mist may adhere. Many.

  However, if a coating film is formed on the inside of the slide rail or paint mist adheres, the smoothness of the inner bottom surface of the slide rail is lost, and the roller that rolls on the inner bottom surface of the slide rail rotates smoothly. This makes it difficult to open and close the sliding door and causes the sliding door to vibrate when opening and closing.

  For this reason, by attaching another member such as a metal plate to the inner bottom surface of the slide rail after the painting process, smoothness is imparted to the inner bottom surface of the slide rail and smooth rotation of the roller is ensured. . However, the process of attaching another member to the inner bottom surface of the slide rail in this way is troublesome, and there is a problem that costs for manufacturing the other member are generated.

  Therefore, in order to prevent the paint from adhering to the slide rail, a method of applying a masking tape having a base material and an adhesive layer to the inner bottom surface of the slide rail and then painting the vehicle body has been proposed (Patent Document). 1).

  Here, the inner bottom surface, which is the portion of the slide rail to which the masking tape is affixed, is located behind the narrow opening of the slide rail, and the masking tape is long. For this reason, as described in Patent Document 1 as a specific embodiment, when the masking tape is composed of a base material, an adhesive layer (also referred to as “lamination laminate” in this specification) and a release sheet. When manually attaching the adhesive laminate to the inner bottom surface, peel off the entire release sheet from the masking tape to expose the entire adhesive layer in the adhesive laminate, and in this state, put the adhesive laminate inside. It is not easy to attach to the bottom. In addition, it is extremely difficult to apply the laminate for application without causing an application failure such as wrinkles while accurately controlling the application position by such a method.

  Therefore, when manually applying the masking tape to the inner bottom surface of the laminate, the masking tape is not separated from the adhesive laminate by separating all the release sheets from the masking tape. Partially peel off the release sheet from the tape to partially expose the adhesive layer at one end of the masking tape, apply the exposed part to a part of the inner bottom surface, and use this applied part as a supporting point The entire adhesive layer of the long masking tape is removed by repeating the process of further peeling off the release sheet to expose a part of the adhesive layer of the masking tape and sticking this exposed part to the inner bottom surface. Affixing to the inner bottom surface is often performed. Hereinafter, such an operation of partially separating the release sheet and the laminate for pasting in the masking tape, and the adhesive layer of the laminate for pasting partially separated from the release sheet and applied to the adherend The sticking method in which the sticking operation is continuously performed is also referred to as a gradually peeling sticking method.

  Affixing the masking tape on the inner bottom surface of the laminate for application may be performed using an application jig as disclosed in Patent Document 2. Also in this case, of the masking tape introduced inside the sticking jig, the release sheet is pushed out along the traveling direction of the sticking jig, while the laminate for sticking is placed on the pressing portion at the front part in the moving direction of the sticking jig. The release sheet and the laminate for pasting are separated by reversing the direction of movement while being bent along, and the laminate for pasting separated from the release sheet and exposing the adhesive layer is separated from the pressing portion and the adherend (slide The pressure-sensitive adhesive layer is affixed to the adherend. Therefore, also in this case, the above-described gradual peeling sticking method is performed.

JP 2007-31552 A JP 2005-52746 A

  The masking tape in a state in which the method of gradually peeling and sticking is carried out has a portion where the adhesive layer is stuck on the adherend (hereinafter also referred to as “attached portion”) and a continuous portion of the attached portion. A portion where the pressure-sensitive adhesive layer is exposed (hereinafter, also referred to as “exposed portion”) and a portion where the pressure-sensitive adhesive layer is covered with a release sheet, which is continuously located on the exposed portion (hereinafter referred to as “coating”). It can also be classified as “part”.)

  When the masking tape is stuck using the sticking jig disclosed in Patent Document 2, the masking tape can be stably separated into the release sheet and the sticking laminate at the end portion in the traveling direction of the sticking jig. In other words, it is important that the exposed portion during the pasting operation has an appropriate length, and for this purpose, the release sheet is required to have a certain degree of rigidity (roughness).

  A paper-based material is exemplified as a release substrate that provides a release sheet with a certain degree of rigidity and suitable for stably performing such a gradual release and sticking method. In the present specification, the “paper-based material” means a material that maintains a sheet-like shape by laminating fibrous substances (typically plant-derived fibers) while being intertwined with each other. A fibrous substance may be contained, or a binder component that binds the fibrous substances to each other may be contained.

  However, when the release sheet is composed of a release substrate made of this paper-based material, the release surface made of a release agent layer obtained by performing a release treatment on one main surface of the release substrate is a paper. It has irregularities unique to the system material. For this reason, the surface of the pressure-sensitive adhesive layer in the masking tape obtained by peeling off the release sheet reflects unevenness on the release surface of the release sheet, and the smoothness is lowered.

  The smoothness of the inner bottom surface of the slide rail to which the masking tape is affixed is generally processed to be high, and when the masking tape adhesive layer is affixed to the inner bottom surface, the slide rail is narrow. Since the inner bottom surface is located at the back of the opening, it is usually not applied while applying a high pressure. For this reason, when the smoothness of the pressure-sensitive adhesive layer in the masking tape is low, a portion where the pressure-sensitive adhesive layer cannot properly come into contact with the highly smooth inner bottom surface is generated. And the abutting surface). The air bubbles remaining on the sticking surface expand due to heat applied in a drying operation performed as a part of the slide rail coating process, and enlarge an area where the adhesive layer is not in contact with the inner bottom surface. When the region where the pressure-sensitive adhesive layer is not in contact with the inner bottom surface reaches the end portion of the masking tape, a portion not in contact with the inner bottom surface is generated at the end portion of the masking tape. If this phenomenon occurs during painting, the paint enters between the pressure-sensitive adhesive layer and the inner bottom surface, resulting in masking failure.

  The present invention is a release sheet suitable for stably performing the method of gradually peeling and sticking, and prevents the occurrence of the above-mentioned masking failure, and has an excellent masking effect even when stuck by the gradually peeling and sticking method. It is an object of the present invention to provide a release sheet that provides a masking tape to be played, and a masking tape including the release sheet.

  In order to achieve the above object, first, the present invention is a release sheet for a masking tape, and includes a release substrate made of a paper-based material, an intervening pressure-sensitive adhesive layer, a smoothing adjustment layer, and a release agent layer in this order. It consists of a laminated body, and the release sheet has a bending resistance of 100 mN or more, and the release surface of the release sheet consisting of the surface opposite to the surface facing the smoothing adjustment layer in the release agent layer is JIS B0601: 2013. Provided is a release sheet characterized in that the arithmetic average waviness Wa defined by (ISO 4287: 1997) is 0.3 μm or less (Invention 1).

  When a paper-based material is used as the base material (peeling base material) of the release sheet of the masking tape, by laminating a smooth adjustment layer made of a resin-based material or the like on the peeling base material via an intervening adhesive layer, While increasing the bending resistance of the release sheet, it is possible to improve the smoothness of the surface of the pressure-sensitive adhesive layer to be applied to the adherend surface of the masking tape. It is possible to suppress masking defects based on various phenomena.

  In the said invention (invention 1), the said smooth adjustment layer consists of a resin film, and may be affixed on the said peeling base material by the said interposition adhesive layer (invention 2). In this case, the resin film is preferably made of polyester (Invention 3), and the polyester is more preferably polyethylene terephthalate (Invention 4).

  In the said invention (invention 2-4), it is preferable that the thickness of the said resin-type film is 30 micrometers or more (invention 5).

In the said invention (invention 1-5), it is preferable that the basic weight of the said paper-type base material is 55 g / m < ² > or more (invention 6).

  Secondly, the present invention is a masking tape comprising the release sheet according to the present invention (Inventions 1 to 6) and a laminate for pasting having a base material and an adhesive layer, and the release surface of the release sheet A masking tape on which the pressure-sensitive adhesive layer is provided is provided (Invention 7). Such masking tape may be for masking the inner bottom surface of the slide rail (invention 8).

  The masking tape provided with the release sheet according to the present invention has a release sheet having a bending resistance of 100 mN or more, and thus can be stably applied by a gradual release application method. And since the arithmetic mean wave | undulation Wa of the peeling surface in the peeling sheet of a masking tape is 0.3 micrometer or less, the surface of the adhesive layer which contact | abutted to this peeling surface until it was used is smooth. For this reason, even if the adhesive layer of the masking tape is affixed to the inner bottom surface of the slide rail, bubbles are unlikely to occur on the affixed surface. Therefore, a portion (gap) that is not in contact with the inner bottom surface is unlikely to be formed at the end portion of the masking tape, and a problem of masking failure in which the paint enters between the adhesive layer and the inner bottom surface during coating is unlikely to occur.

It is sectional drawing which shows notionally the masking tape which concerns on 1st embodiment of this invention. It is sectional drawing which shows notionally the state in the middle of the masking tape which concerns on 1st embodiment of this invention being affixed on the to-be-adhered body. It is sectional drawing which shows notionally the structure of the peeling sheet with which the masking tape which concerns on 1st embodiment of this invention is provided. It is a top view which shows notionally the masking tape used in the example of application which concerns on 1st embodiment of this invention. It is a perspective view which shows notionally the slide rail as an application object in the example of application which concerns on 1st embodiment of this invention. FIG. 6 is a front view conceptually showing the slide rail shown in FIG. 5. It is a front view which shows notionally the use condition of the masking tape sticking jig | tool which concerns on a prior art.

  Hereinafter, components of the masking tape according to the embodiment of the present invention, a manufacturing method thereof, and the like will be described.

1. Masking Tape FIG. 1 is a sectional view conceptually showing the masking tape according to the first embodiment of the present invention.
The masking tape 10 according to the present embodiment includes a release sheet 11, a pressure-sensitive adhesive layer 12 provided on the release surface 11 a of the release sheet 11, and a main surface opposite to the side facing the release sheet 11 in the pressure-sensitive adhesive layer 12. The sheet-like base material 13 provided on is provided. At the time of use, the release sheet 11 is peeled from the masking tape 10, and the sticking laminate 9 composed of the pressure-sensitive adhesive layer 12 and the base material 13 is stuck on the inner bottom surface of the slide rail as the adherend.
FIG. 2 is a partial sectional view conceptually showing a state in the middle of the masking tape according to the first embodiment of the present invention being stuck to the adherend by the method of gradually peeling and sticking.

(1) Release Sheet The release sheet 11 according to the present embodiment protects the adhesive layer 12 until the masking tape 10 is attached to the inner bottom surface of the slide rail and has the following function.

(A) Affixing work area securing function The affixing work area securing function is a pressure-sensitive adhesive layer on the inner bottom surface of the slide rail that is the adherend 14 when the adhesive layer 12 of the masking tape 10 is pasted by the method of gradually peeling and pasting. 2 between the part (applied part, 10a in FIG. 2) to which 12 is attached and the part (covered part, 10c in FIG. 2) where the adhesive layer 12 is covered by the release surface 11a of the release sheet 11 The function of making the length of the masking tape 10 in the longitudinal direction of the formed portion where the adhesive layer 12 is exposed (exposed portion, 10b in FIG. 2) suitable for stably performing the method of gradually peeling and sticking. In other words, this is a function of securing an area for the pasting work of the pasting laminate 9. As shown in FIG. 2, the release sheet 11 with an appropriate application work area securing function has a release position SP, which is a position where the release of the adhesive laminate 9 and the release sheet 11 starts, far from the adherend 14. As a result, a sufficient space is secured between the release sheet 11 peeled off from the laminate for pasting 9 and the adherend 14, and the pasted portion 10a advances (progresses to the left in FIG. 2). In particular, there is no influence of the release sheet 11 (a specific example is that the release sheet 11 peeled off from the masking tape 10 is caught in the pasted portion 10a of the laminate 9 for sticking). On the other hand, as shown by a two-dot chain line in FIG. 2, in the release sheet 11 ′ where the application work area securing function is not appropriate, the release position SP ′ becomes a position proximal to the adherend 14, The space formed between the release sheet 11 ′ peeled from the body 9 and the adherend 14 is narrow. For this reason, when the pasted portion 10a progresses (protrusion to the left in FIG. 2), there is a possibility that the release sheet 11 ′ peeled from the sticking laminate 9 may be caught, and the inclusion of the release sheet 11 ′ is fatal. Can result in poor sticking.

(B) Smoothness imparting function The smoothness imparting function is a function of adjusting the smoothness of the surface applied to the inner bottom surface of the pressure-sensitive adhesive layer 12 of the adhesive laminate 9 obtained by separating the release sheet 11 from the masking tape 10. It is. The pressure-sensitive adhesive layer 12 is in contact with the release surface 11a of the release sheet 11 until immediately before the masking tape 10 is attached to the adherend. Since the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 is soft, the pressure-sensitive adhesive is deformed to follow the peeling surface 11a when in contact with the peeling surface 11a. For this reason, the exposed main surface (hereinafter referred to as “exposed surface”) of the pressure-sensitive adhesive layer 12 of the laminate for pasting 9 has a shape based on the inverted shape of the peeling surface 11a. Here, when the peeling base material 21 of the release sheet 11 is made of a paper-based material, the surface of the peeling base material 21 is a rough surface with many irregularities due to the paper-based material. A general release sheet is obtained by forming a resin layer on this release substrate by melt extrusion molding or the like, and further performing a release treatment on the resin layer to provide a release agent layer. In the case of such a general release sheet, unevenness caused by the paper-based material exists on the release surface of the release sheet. For this reason, in a general masking tape, an unevenness | corrugation exists also in the exposed surface of the adhesive layer of the laminated body for sticking obtained by peeling a peeling sheet from now. As described above, since a strong pressure is often not applied when the laminate 9 for pasting is stuck to the adherend 14, the adhesive surface of the adhesive layer 12 of the laminate 9 for pasting has an exposed surface. It is easy to maintain the shape characteristics. For this reason, in the general masking tape, the concave portion of the exposed surface of the adhesive layer of the laminate for pasting 9 formed corresponding to the convex portion of the peeling surface is maintained even if it is stuck, It becomes a bubble. As described above, this bubble is one of the causes of masking failure. Therefore, by making the surface property of the peeling surface 11a of the masking tape 10 as smooth as possible, the exposed surface of the adhesive layer 12 of the laminate for pasting 9 can be smoothed. By smoothing, the occurrence of masking failure is suppressed.

  Hereinafter, characteristics required for the release sheet 11 to have the above functions will be described in detail.

i) Bending / softening The peeling sheet 11 according to the present embodiment has a bending / softening degree of 100 mN or more so as to appropriately include a function of securing a pasting work area. The bending resistance may be measured by the Gurley method defined in JIS L1096. When the bending resistance is less than 100 mN, the peeling position SP easily moves to a position proximal to the adherend 14. In this case, the length of the exposed portion 10 b of the masking tape 10 is excessively long. It will be shorter. As a result, it becomes difficult to perform the gradual peeling sticking method stably. From the viewpoint of more stably performing the sticking by the gradually peeling sticking method, the bending resistance of the release sheet 11 is preferably 150 mN or more, more preferably 200 mN or more, and particularly preferably 300 mN or more.

  The upper limit of the bending resistance of the release sheet 11 according to this embodiment is not limited. From the viewpoint of ensuring the workability of attaching, the bending strength of the release sheet 11 is preferably 1000 mN or less, and if it is in the range of 100 mN or more and 600 mN or less, a slide rail used for a general automobile slide door is used. It is stably realized that the pressure-sensitive adhesive layer 12 of the masking tape 10 is applied to the inner bottom surface by a gradual peeling application method.

  From the viewpoint of satisfying such a demand for bending resistance, the release sheet 11 according to this embodiment has a release substrate made of a paper-based material.

ii) Waviness amplitude When the release substrate is made of a paper-based material as described above, the release substrate made of a paper-based material usually has a noticeable undulation in the range of 600 μm to 10 mm. Even when a release substrate having such undulations is used, the release sheet 11 according to this embodiment is required to have a smoothness imparting function appropriately. In order to meet this demand, the peeling surface 11a of the peeling sheet 11 of the masking tape 10 according to the present embodiment has an arithmetic average waviness Wa of 0.3 μm or less as defined in JIS B0601: 2013 (ISO 4287: 1997). . When the arithmetic average waviness Wa is 0.3 μm or less, the possibility of the generation of bubbles on the above-described pasting surface is stably reduced. From the viewpoint of more stably reducing the possibility of bubble generation, the arithmetic average waviness Wa of the release surface 11a of the release sheet 11 of the masking tape 10 according to the present embodiment is preferably 0.2 μm or less. More preferably, it is 0.1 μm or less. The lower limit of the arithmetic mean waviness Wa of the release surface 11a of the release sheet 11 of the masking tape 10 according to the present embodiment is not set from the viewpoint of reducing the possibility of the generation of bubbles. The release sheet 11 of the masking tape 10 according to the present embodiment can have an arithmetic average waviness Wa of about 0.03 μm or less.

iii) Peeling Substrate Hereinafter, the detailed structure of the peeling sheet 11 according to the present embodiment will be described with reference to FIG.
FIG. 3 is a cross-sectional view conceptually showing the structure of the release sheet 11 according to this embodiment.

  The release sheet 11 according to the present embodiment includes a release base 21 made of a paper-based material, a smooth adjustment layer 23 provided on one main surface of the release base 21 via an intervening adhesive layer 22, and a smooth adjustment. The release agent layer 24 provided on the main surface opposite to the side facing the intervening adhesive layer 22 in the layer 23 is provided. In the release sheet 11 according to this embodiment, the surface of the release agent layer 24 opposite to the surface facing the smoothing adjustment layer 23 forms the release surface 11a.

  The paper-type material which comprises the peeling base material 21 is not specifically limited, Good quality paper, glassine paper, and kraft paper are illustrated. Moreover, since it has the highest rigidity among the elements which comprise the peeling sheet 11, in order for the peeling sheet 11 to have the above-mentioned sticking work area ensuring function appropriately, only the peeling base material 21 is sufficient. A material that can have a bending resistance of 100 mN or more and 600 mN or less is preferable.

  The upper and lower limits of the thickness of the release substrate 21 are preferably set in consideration of the material of the release substrate 21 such that the bending resistance of the release substrate 21 alone is 100 mN or more and 600 mN or less.

The basis weight of the paper-based material constituting the release substrate 21 is 50 g / m ² or more and 200 g / m ² or less from the viewpoint that it is easy to realize that the bending resistance of the release substrate 21 is 100 mN or more and 600 mN or less. It is preferable that

iv) Smooth adjustment layer The release sheet 11 according to the present embodiment includes a smooth adjustment layer 23 as a member that directly controls the degree of the smoothness imparting function of the release sheet 11. The release sheet 11 according to the present embodiment has an excellent smoothing function by reducing the arithmetic average waviness Wa of the release surface 11a of the release sheet 11 by the smooth adjustment layer 12.

  The material which comprises the smooth adjustment layer 23 is not specifically limited. An example of such a material is a resin material. Here, the “resin-based material” includes not only a resin but also a case where a non-resin material such as a filler is dispersed in the resin. From the viewpoint of easily obtaining a smooth surface and excellent productivity, the resin-based material preferably contains a thermoplastic resin. Examples of a thermoplastic resin suitable as a material constituting the smoothness adjusting layer 23 include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyimide, polyetherimide, polyaramid, polyetherketone, polyetheretherketone, polyphenylene sulfide, And poly (4-methylpentene-1). These materials can be used alone, or different types of materials in the above can be laminated and used. Alternatively, the above material and a resin material other than the above can be laminated and used. Among the above materials, polyester is preferably used in terms of smoothness, dimensional stability, solvent resistance, adhesion of the release treatment agent, heat resistance, availability, and the like, and among them, polyethylene terephthalate is preferable.

  The smoothness adjusting layer 23 according to the present embodiment is a member having a film shape, and the surface thereof is adjusted in advance to a smooth surface. A general release sheet may be provided with a resin layer on a release substrate. This resin layer is usually formed on the release substrate by melt extrusion molding or the like. For this reason, the shape characteristic of the surface on the opposite side to the resin layer in a peeling base material is reflected in the surface on the opposite side to the peeling base material in a resin layer. Therefore, when the release substrate is made of a paper-based material, the surface of the resin layer opposite to the release substrate has irregularities based on the paper-based material constituting the release substrate, and a smooth surface. Must not. On the other hand, the smooth adjustment layer 23 is adjusted in advance to a smooth surface as described above, and between the smooth adjustment layer 23 in the release sheet 10 and the release substrate 21 made of a paper-based material, There is an intervening pressure-sensitive adhesive layer 22. For this reason, the surface on the smoothing adjustment layer 23 side of the release sheet 10 is a smooth surface while maintaining the smoothness of the surface of the smoothing adjustment layer 23.

  The thickness of the film providing the smooth adjustment layer 23 is not limited. From the viewpoint of reducing the influence of the waviness of the paper-based material constituting the release substrate 21 on the smoothness of the release surface 11a of the release sheet 11 of the masking tape 10, the thickness of the film providing the smoothing adjustment layer 23 is 10 μm. It is preferable that the thickness is 30 μm or more. From the viewpoint of reducing the arithmetic average waviness Wa of the release surface 11a of the release sheet 11, the upper limit of the thickness of the smoothing adjustment layer 23 is not limited. As long as the arithmetic average waviness Wa of the release surface 11a of the release sheet 11 can be set to 0.3 μm or less, the smoothness adjusting layer 23 is advantageously thinner from the viewpoint of reducing the production cost of the masking tape 10. In addition, when the smooth adjustment layer 23 is excessively thick, the bending resistance of the release sheet 11 may be excessively increased. From this viewpoint, it may be preferable that the thickness of the smoothing adjustment layer 23 is 100 μm or less.

v) Intervening pressure-sensitive adhesive layer The release sheet 11 according to the present embodiment fixes a smooth adjustment layer 23 having a film shape in advance on a release substrate 21 made of a paper-based material, and is moderately soft and peeled. Intervening pressure-sensitive adhesive layer 22 for reducing the influence of the variation in the inter-surface distance between the base material 21 and the smoothing adjustment layer 23 on the smoothness (specifically, arithmetic mean waviness Wa) of the release surface 11a of the release sheet 11. Is provided. The intervening pressure-sensitive adhesive layer 22 fulfills the above-mentioned purpose, and its material and thickness unless the release sheet 11 is obstructed from satisfying the above-mentioned conditions for the bending resistance and the arithmetic mean waviness Wa of the release surface 11a. A specific configuration such as the above is not particularly limited.

  Specific examples of the pressure-sensitive adhesive constituting the intervening pressure-sensitive adhesive layer 22 include acrylic pressure-sensitive adhesives such as acrylic acid ester copolymers. The acrylic pressure-sensitive adhesive can satisfy that it easily adheres to the release substrate 21 made of a paper-based material, easily adheres to the smooth adjustment layer 23, and is moderately soft. The pressure-sensitive adhesive constituting the intervening pressure-sensitive adhesive layer 22 may be one type or a plurality of types. The thickness of the intervening pressure-sensitive adhesive layer 22 is not limited, and is usually about 5 μm to 50 μm. When it is excessively thin, it is difficult to obtain a desired adhesive force, and when it is excessively thick, it tends to protrude from the gap between the release substrate 11 and the smooth adjustment layer 23 at the end of the release sheet 11. Considering these, it is preferable that the thickness of the interposed pressure-sensitive adhesive layer 22 is 10 μm or more and 30 μm or less.

vi) Release Agent Layer The release sheet 11 according to this embodiment includes a release agent layer 24 on the main surface opposite to the side facing the intervening adhesive layer 22 in the smooth adjustment layer 23, and the release agent layer 24 The surface opposite to the surface facing the smoothing adjustment layer 23 forms the release surface 11 a of the release sheet 11.

  The release agent layer 24 is usually obtained by applying a release agent on one main surface of the film forming the smoothing adjustment layer 23. The kind of release agent is not limited. Known release agents such as silicone-based, fluorine-based, and long-chain alkyl-based release agents can be used, and among these release agents, silicone-based release agents that can provide inexpensive and stable performance are preferable. The coating thickness of the release agent and the thickness of the release agent layer 24 should be appropriately set depending on the type of the release agent, and are usually about 0.01 μm to 3 μm.

vii) Manufacturing Method The manufacturing method of the release sheet 11 according to the present embodiment is not limited.

  An example is as follows. First, a release agent layer 24 is formed by performing a release treatment on one main surface of a film made of a resin material forming the smooth adjustment layer 23. A pressure-sensitive adhesive is applied to the main surface of the smoothing adjustment layer 23 opposite to the surface on which the release agent layer 24 is formed, and this is dried to form the intervening pressure-sensitive adhesive layer 22. A release substrate 21 made of a paper-based material is stuck on the main surface made of the intervening pressure-sensitive adhesive layer 22 in the laminate made up of the intervening pressure-sensitive adhesive layer 22, the smoothing adjustment layer 23 and the release agent layer 24 thus obtained. In this way, the release sheet 11 in which the release substrate 21, the intervening pressure-sensitive adhesive layer 22, the smoothing adjustment layer 23, and the release agent layer 24 are arranged in this order is obtained.

(2) Pressure-sensitive adhesive layer The pressure-sensitive adhesive layer 12 included in the masking tape 10 according to this embodiment is attached on the release surface 11a of the release sheet 11 before use, and is peeled off from the release surface 11a at the time of use. In this way, the exposed surface obtained by applying is pasted on the adherend 14 to form a pasting surface.

  The material of the adhesive which comprises the adhesive layer 12 is not specifically limited. As a specific example, an adhesive mainly composed of a resin such as a rubber resin, an acrylic resin, an ethylene-vinyl acetate copolymer, a polyurethane resin, a polyester resin, or a silicone resin can be used. Among these pressure-sensitive adhesives, an acrylic pressure-sensitive adhesive mainly composed of an acrylic resin is preferable in terms of availability, durability, and the like.

  The thickness of the pressure-sensitive adhesive layer 12 is usually about 5 to 60 μm, preferably 10 to 40 μm. In the case where it is excessively thin, it is difficult to obtain a desired adhesive force, and in the case where it is excessively thick, it is economically disadvantageous and the possibility that the adhesive protrudes from the substrate 13 is increased. What is necessary is just to set the thickness of 12 suitably.

  The pressure-sensitive adhesive layer 12 may contain components other than the pressure-sensitive adhesive. Examples of such components include fillers such as calcium carbonate, aluminum paste, and silica gel.

(3) Base Material The masking tape 10 according to the present embodiment includes a sheet-like base material 13 on the main surface opposite to the side facing the release sheet 11 of the pressure-sensitive adhesive layer 12. The base material 13 becomes a support member for the pressure-sensitive adhesive layer 12 when the pressure-sensitive adhesive layer 12 of the masking tape 10 is affixed to the adherend 14, and is gripped by the operator when the masking tape 10 is peeled off after the masking process is completed. Part.

  In the masking tape 10 according to the present embodiment, the specific configuration of the base material 13, for example, the material, the thickness, and the like are arbitrary.

  When the base material 13 is made of an excessively soft material, the pressure-sensitive adhesive layer 12 cannot be supported. On the contrary, when the base material 13 becomes an excessively hard material, the flexibility tends to be lowered. In these cases, an appropriate material may be selected considering that workability of attaching and peeling is remarkably lowered.

  Examples of the material constituting the base material 13 include resin-based materials. Specific examples of the resin in the resin material include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyimide, polyetherimide, polyaramid, polyetherketone, polyetheretherketone, polyphenylene sulfide, and poly (4-methylpentene-1). Etc. These materials can be used alone, or different types of materials in the above can be laminated and used. Alternatively, the above material and a resin material other than the above can be laminated and used. Among the above materials, polyester is preferably used from the viewpoints of heat resistance, dimensional stability, availability stability, etc., and among them, polyethylene terephthalate is preferable.

  The masking tape 10 may be placed in a high temperature environment while being affixed to the adherend. In particular, when used as a masking material for the inner bottom surface of a slide rail of an automobile slide door, it is placed in an environment of about 180 ° C. for drying after electrodeposition coating. Therefore, when exposed to such a high temperature environment, the softening point of the resin material constituting the base material 13 is preferably 200 ° C. or higher. The softening point of the resin material can be obtained by measuring according to JIS K7234.

  The thickness of the base material 13 is usually about 20 to 300 μm. If the thickness of the base material 13 is less than 20 μm, there is a concern that the base material 13 is easily broken when the masking tape 10 is peeled off after the masking is finished, and the workability is lowered. On the other hand, when the thickness of the base material 13 exceeds 300 μm, the flexibility may be lowered and the attaching workability of the masking tape 10 may be easily lowered. From the viewpoint of stably ensuring good pasting workability, the thickness of the base material 13 is preferably 250 μm or less.

2. Manufacturing method of masking tape The manufacturing method of the masking tape 10 of this embodiment which consists of a laminated body of said peeling sheet 11, the adhesive layer 12, and the base material 13 is not specifically limited.

Some examples of the manufacturing method of the masking tape 10 are as follows.
i) The pressure-sensitive adhesive layer 12 is formed on the release surface 11 a of the release sheet 11, and one main surface of the substrate 13 is pressure-bonded and laminated on the pressure-sensitive adhesive layer 12. At this time, the formation method of the adhesive layer 12 is arbitrary.

  An example of the method for forming the pressure-sensitive adhesive layer 12 is as follows. A coating agent containing the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 and, if desired, a solvent is prepared. It is applied on the release surface of the release sheet by a coating machine such as a roll coater, knife coater, roll knife coater, air knife coater, die coater, bar coater, gravure coater, curtain coater. The pressure-sensitive adhesive layer 12 is formed by drying the layer made of the coating agent on the release surface of the release sheet.

  Here, the manufacturing method of the base material 13 is arbitrary. A member having a film shape in advance may be used as the substrate 13 as it is, or a plurality of members having such a film shape may be laminated to form the substrate 13. In this lamination, a layer made of an adhesive or an adhesive may be provided between the members. Alternatively, the base material 13 may be formed by forming a fluid composition into a film. At this time, there may be a plurality of compositions having fluidity, and the base material 13 having a laminated structure may be obtained by a molding method such as coextrusion.

  ii) A substrate 13 is formed, an adhesive layer 12 is formed thereon, and a release sheet 11 is further laminated. The formation method of the adhesive layer 12 at this time is arbitrary as above-mentioned.

  As an example other than the above methods (i) and (ii), a pressure-sensitive adhesive layer 12 formed separately in a sheet shape may be attached to the base material 13.

3. Application Example Next, a specific application example of the masking tape 10 according to the present embodiment will be described with reference to FIGS.

  In this application example, a slide rail for an automobile slide door is applied, and the masking tape 10 is used as a masking member for masking the inner bottom surface of the slide rail.

  FIG. 4 is a plan view conceptually showing a masking tape used in one application example according to this embodiment. FIG. 5 is a perspective view conceptually showing the entire structure of the slide rail as an application target in this application example. FIG. 6 is a front view conceptually showing the partial structure of the slide rail shown in FIG.

  As shown in FIG. 4, the masking tape 10 in this application example is long and has one end in the longitudinal direction curved in accordance with the shape of the inner surface of the slide rail described below. Although the specific dimension of this masking tape 10 is arbitrary, its width is usually 5 to 20 mm, and its length (converted into a curved portion as a straight line) is usually 450 to 1200 mm.

  As shown in FIGS. 5 and 6, the slide rail 100 in this application example is connected to a rail upper portion 101 having a substantially U-shaped cross section that opens downward, and a rear lower end of the rail upper portion 101, and is in a vertical direction. The rail back portion 102 is connected to the lower end of the rail back portion 102, and the rail bottom portion 103 is provided in the horizontal direction toward the front side. The rail bottom portion 103 is connected to the front end of the rail bottom portion 103 and forms an acute angle with the rail bottom portion 103. And one end of the slide rail 100 in the longitudinal direction is curved.

  In the slide rail 100 having such a shape, the surface of the rail bottom 103, that is, the inner bottom surface 105 of the slide rail 100 is a masking target surface of the laminated body 9 for applying the masking tape 10. In other words, the sticking laminate 9 of the masking tape 10 is stuck so that the main surface side made of the adhesive layer 12 faces the inner bottom surface 105 of the slide rail 100 to mask the inner bottom surface 105.

  The embodiment described above is described for facilitating understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention. For example, in the above description, the release sheet 11 is peeled off from the masking tape 10 and the sticking laminate 9 obtained by the peeling is attached to the inner bottom surface 105 of the slide rail 100 using a jig. However, the present invention is not limited to this. The peeling of the release sheet 11 and the sticking laminate 9 (gradual peeling sticking method) may be performed manually. Even when peeling or sticking is performed manually, the release sheet 11 is placed in the region where the sticking laminate 9 is stuck to the inner bottom surface 105 by using the masking tape 10 according to one embodiment of the present invention. Is difficult to be caught and masking defects are less likely to occur even if the pressure applied during application is small.

  EXAMPLES Hereinafter, although an Example etc. demonstrate this invention further more concretely, the scope of the present invention is not limited to these Examples etc.

[Example 1]

  A polyethylene terephthalate film (thickness: 50 μm) having a release treatment (silicone 0.5 μm) on one main surface in advance was prepared as a smooth adjustment layer having a release agent layer on one main surface. An acrylic pressure-sensitive adhesive was applied on the main surface of the smoothing adjustment layer that had not been subjected to the peeling treatment, and this was dried to form an intermediate pressure-sensitive adhesive layer having a thickness of 20 μm.

The main surface on the intervening adhesive layer side of the laminate composed of the smoothing adjustment layer and the intervening adhesive layer is attached to one main surface of a release substrate made of high-quality paper (basis weight 80 g / m ² ) having a thickness of 94 μm. Thus, a release sheet having a release surface composed of a release agent layer was obtained. On the release surface of the release sheet thus obtained, an acrylic pressure-sensitive adhesive was applied and dried to obtain a first laminate in which a pressure-sensitive adhesive layer having a thickness of 40 μm was provided on the release sheet.

  A base material composed of a polyethylene terephthalate film (Lumirror (registered trademark) T60 manufactured by Toray Industries, Inc., thickness 100 μm) was stuck on the surface of the first laminate on the pressure-sensitive adhesive layer side to obtain a masking tape.

[Example 2]
In Example 1, a masking tape was produced in the same manner as in Example 1 except that a release sheet was obtained using glassine paper (basis weight 83 g / m ² ) having a thickness of 70 μm instead of fine paper. .

Example 3
In Example 2, except that a release sheet was obtained using a polyethylene terephthalate film (thickness 38 μm) that had been subjected to a release treatment on one main surface in advance as a smooth adjustment layer, the same as in Example 2, A masking tape was produced.

Example 4
In Example 2, except that a release sheet was obtained using a polyethylene terephthalate film (thickness 25 μm) that had been subjected to a release treatment on one main surface in advance as a smooth adjustment layer, A masking tape was produced.

Example 5
A masking tape was produced in the same manner as in Example 1 except that a release sheet was obtained using high-quality paper (basis weight 64 g / m ² ) having a thickness of 78 μm in Example 1.

Example 6
A masking tape was produced in the same manner as in Example 4 except that a release sheet was obtained using high-quality paper (basis weight 64 g / m ² ) having a thickness of 78 μm in Example 4.

[Comparative Example 1]
Except that a polyethylene terephthalate film (thickness 50 μm) having a release treatment applied to one main surface in advance was used as a release sheet, and no intervening adhesive layer and release substrate were applied, the same as in Example 1. A masking tape was manufactured.

[Comparative Example 2]
A polyethylene layer with a thickness of 20 μm is pasted directly onto a glassine paper with a thickness of 70 μm (basis weight 83 g / m ² ) without using an intervening adhesive layer, and peeled off on the obtained polyethylene layer. A masking tape was produced in the same manner as in Example 1 except that the treatment was performed and the obtained laminate was used as a release sheet.

[Test Example 1] (Bending softness)
About the peeling sheet of the masking tape manufactured by the Example and the comparative example, the bending resistance was measured by the Gurley method prescribed | regulated to JISL1096: 2010 using the Toyo Seiki Seisakusho Gurley flexibility tester. The measurement results are shown in Table 1.

[Test Example 2] (Arithmetic mean waviness Wa)
About the peeling surface of the peeling sheet of the masking tape manufactured by the Example and the comparative example, it is prescribed | regulated to JIS B0601: 2013 (ISO 4287: 1997) using the surface roughness measuring machine Surf Test Extreme SV-3000CNC made from Mitutoyo. The arithmetic mean waviness Wa was measured. The measurement results are shown in Table 1.

[Test Example 3] (Jig sticking property)
The masking tape manufactured in the above-mentioned examples and comparative examples was stuck on the slide rail using a masking tape sticking jig disclosed in Patent Document 2 (see FIG. 7).
Here, operation | movement of said masking tape sticking jig is demonstrated using FIG. FIG. 7 is a front view conceptually showing a use state of a masking tape attaching jig according to the prior art.
As shown in FIG. 7, the masking tape 10 composed of the release sheet 11 and the laminate for pasting 9 is folded back from the lower side of the pressing part 4 of the masking tape sticking jig 1 at the front part in the moving direction. Through the upper side, the masking tape sticking jig 1 is fed from the direction opposite to the moving direction. When the masking tape 10 is folded back as described above, the release sheet 11 is peeled off from the sticking laminate 9 at the peeling position SP due to its rigidity.
When the main body 2 of the masking tape sticking jig 1 is grasped and the masking tape sticking jig 1 is moved to the left end side of the slide rail 8 while being pressed against the slide rail 8 as shown in FIG. The pressing portion 4 of the sticking jig 1 presses the sticking laminate 9 to the inner bottom surface 841 (the adherend 14 in FIG. 2) of the slide rail 8 while separating the release sheet 11 and the sticking laminate 9. . At this time, the release sheet 11 separated from the laminate for sticking 9 is allowed to escape in the moving direction of the masking tape sticking jig.
Whether the application using the masking tape application jig 1 could be performed stably was evaluated from the following viewpoint.
A (good): At the front part in the moving direction of the sticking jig 1, the sticking laminate 9 was separated from the release sheet 11 while being folded back along the shape of the pressing part 4, and sticking was performed stably.
B (possible): When the laminating laminate 9 and the release sheet 11 are separated at the front part in the moving direction of the pasting jig 1, the position (peeling position SP) at which the laminating laminate 9 and the release sheet 11 are separated is There is a case where it moves to the inner bottom surface 841 side, that is, it moves to a position advanced in the moving direction front side of the release sheet 11, and at this time, a part of the laminate for pasting 9 separated from the release sheet 11 is a pressing part. 4 was separated from the front in the moving direction.
C (impossible): When the laminate for pasting 9 and the release sheet 11 are separated at the front part in the moving direction of the sticking jig 1, the position at which the laminate for pasting 9 and the release sheet 11 are separated (peeling position SP) is It may move to the inner bottom surface 841 side, that is, may move onto the resin sheet at the front of the pressing portion 4 in the moving direction. If such a state is left as it is, the laminating laminate 9 and the release sheet 11 are separated. Without entering the gap between the inner bottom surface 841 of the slide rail 8 and the pressing portion 4, a sticking failure occurred.
When it was “A” or “B” by the above evaluation, it was determined to be acceptable. The results are shown in Table 1.

[Test Example 4] (Appearance of affixed surface)
The adhesion surface of the stainless steel plate, which was determined to be acceptable in Test Example 1 and appropriately adhered, was observed in appearance to evaluate the presence or absence of residual bubbles. The results are shown in Table 1.

  As is clear from Table 1, the masking tapes according to the examples were excellent in jig sticking ability and could be stably subjected to the gradual peeling sticking method, and no air bubbles remained on the sticking surface.

  Since the release substrate of the masking tape according to the present invention is made of a paper-based material, it can be stably applied by a gradual release application method. And since this peeling sheet is provided with a smooth adjustment layer, it is difficult for air bubbles to remain on the sticking surface formed by sticking the pressure-sensitive adhesive layer of the masking tape provided with such a peeling sheet to the adherend. Therefore, masking tape on the inner bottom surface of slide rails such as automobile doors that require high temperature drying such as electrodeposition coating, especially slides such as automobile doors that require high temperature drying such as electrodeposition coating. It is suitably used as a masking tape for the inner bottom surface of the rail.

DESCRIPTION OF SYMBOLS 10 ... Masking tape 11 ... Release sheet 12 ... Adhesive layer 13 ... Base material 9 ... Laminated body 14 ... Adhered body 21 ... Release base material 22 ... Interposition adhesive layer 23 ... Smoothing adjustment layer 24 ... Release agent layer

Claims (8)

A masking tape release sheet,
A laminate comprising a paper base material, a release adhesive layer, an intervening pressure-sensitive adhesive layer, a smoothing adjustment layer and a release agent layer in this order,
The bending resistance is 100 mN or more,
The release surface of the release sheet composed of the surface opposite to the surface facing the smoothing adjustment layer in the release agent layer has an arithmetic average waviness Wa of 0.00 as defined in JIS B0601: 2013 (ISO 4287: 1997). A release sheet, which is 3 μm or less.   The release sheet according to claim 1, wherein the smooth adjustment layer is made of a resin film, and is attached to the release substrate by the intervening pressure-sensitive adhesive layer.   The release sheet according to claim 2, wherein the resin film is made of polyester.   The release sheet according to claim 3, wherein the polyester is polyethylene terephthalate.   The release sheet according to any one of claims 2 to 4, wherein the resin film has a thickness of 30 µm or more. The release sheet according to any one of claims 1 to 5, wherein a basis weight of the paper-based substrate is 55 g / m ² or more.   It is a masking tape provided with the peeling sheet as described in any one of Claim 1 to 6, and the laminated body for sticking which has a base material and an adhesive layer, Comprising: The said adhesive on the peeling surface of the said release sheet Masking tape with a layer.   The masking tape according to claim 7, which is for masking an inner bottom surface of the slide rail.