JP6494761B2 - Release film and adhesive laminate - Google Patents

Description

  The present invention relates to a release film having a substrate having a plurality of linear irregularities, and a release layer provided on the surface of the substrate, and a pressure-sensitive adhesive laminate having this release film, particularly in two orthogonal directions. It is related with the peeling film which has peeling strength anisotropy from which peeling strength differs, and an adhesive laminated body which has this peeling film.

Currently, release films are used in various applications. A release film is a film having a release layer on a substrate. For example, Patent Document 1 describes a release film for forming a linear design on the surface of a molded body when a protective layer such as a hard coat layer is thermally transferred onto the surface of the molded body.
The release film of Patent Document 1 has a solid content weight ratio of 95 to 95 on the plastic film surface provided with hairline-shaped irregularities having a surface roughness Ra of 0.1 to 0.9 μm. : A release layer made of a mixture in the range of 5 to 20:80 is provided, and the release layer thickness D (μm) is 0.5 × Ra ≦ 0.5 with respect to the linear surface roughness Ra (μm). The relationship of D ≦ 1.5 × Ra is satisfied.

  On the other hand, as an example having unevenness on the substrate, in the pressure-sensitive adhesive tape in which an adhesive is applied to a support in Patent Document 2, the pressure-sensitive adhesive surface has an uneven shape with a pitch of 1 mm or less on the pressure-sensitive adhesive surface. Describes an adhesive tape having a fine shape. In the concavo-convex shape, the depth of the convex portion from the support surface is 20 μm or less, and the height of the concave portion from the support surface is 10 to 90% of the height of the convex portion. It is a waveform. The pressure-sensitive adhesive tape of Patent Document 2 has anisotropy in adhesive force.

JP 2014-176987 A JP 7-126582 A

In the release film of Patent Document 1 described above, a release layer is provided on a plastic film surface provided with hairline-shaped irregularities, but no consideration is given to the anisotropy of peel strength. If the anisotropy of the peel strength is small, a phenomenon called tunneling, in which the space between the release layer and the adhesive layer rises like a tunnel when winding a thick base material processed with an adhesive or a strong release film, is taken up. Occur.
The pressure-sensitive adhesive tape of Patent Document 2 has a fine shape having an uneven shape with a pitch of 1 mm or less on the surface of the pressure-sensitive adhesive, and has an adhesive force anisotropy by giving the surface structure. However, the pressure-sensitive adhesive tape of Patent Document 2 has a problem that air easily enters due to the uneven shape. When it is difficult to enter air in Patent Document 2, it is difficult to obtain anisotropy of adhesive force.

  An object of the present invention is to provide a release film having a peel strength anisotropy that has different peel strengths in two orthogonal directions, and a pressure-sensitive adhesive laminate having the release film, which solves the above-mentioned problems based on the prior art. It is in.

In order to achieve the above-mentioned object, an embodiment of the present invention has a substrate having a plurality of linear irregularities extending in one direction on the surface, and a release layer provided on the surface of the substrate, The peel strength between the pressure-sensitive adhesive tape and the peelable layer measured by a peel test using a pressure-sensitive adhesive tape is 1.8 times greater in one direction in which a plurality of linear irregularities extend and in the other direction perpendicular to the one direction. The present invention provides a release film characterized by being different from the above.
The maximum height Rz (μm) of the surface of the substrate and the average length Rsm (mm) are preferably 20 ≦ Rz (μm) / Rsm (mm) ≦ 50. Here, the average length Rsm (mm) is an average period (mm) of unevenness in another direction orthogonal to one direction in which a plurality of linear unevenness extends.

  For example, the release layer is made of a silicone resin or a fluorine resin. For example, the base material is comprised with polyester. The substrate preferably has a thickness of 12 to 300 μm.

1st aspect of this invention has the peeling film and adhesive layer of embodiment of this invention, and the base material and the adhesive layer are laminated | stacked through the peeling layer, The adhesive A laminated body is provided.
The second aspect of the present invention has the release film of the embodiment of the present invention and a support provided with an adhesive layer on at least one surface, the release layer of the release film is directed to the adhesive layer, A pressure-sensitive adhesive laminate is provided in which a release film and a support are laminated.

In the third aspect of the present invention, the release film of the embodiment of the present invention has a pair and a pressure-sensitive adhesive layer, the release film is provided on both sides of the pressure-sensitive adhesive layer, and the release layer of the pair of release films The present invention provides a pressure-sensitive adhesive laminate characterized by being directed to a pressure-sensitive adhesive layer.
It is preferable that the substrate has a support, the pressure-sensitive adhesive layer is provided on both sides of the support, and the release layer of the release film is directed to each pressure-sensitive adhesive layer so that the release film and the support are laminated. . It is preferable that the direction of one direction where a linear unevenness | corrugation extends differs between the base material of one peeling film, and the base material of the other peeling film. The pressure-sensitive adhesive layer is preferably an optical transparent adhesive layer.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of a tunneling can be prevented when providing a support body with an adhesive and winding up with respect to a peeling film. Moreover, according to this invention, an operator can peel a peeling film, without mistaking the peeling direction.

It is a schematic diagram which shows the structure of the peeling film of embodiment of this invention. It is a schematic plan view which shows the base material of the peeling film of embodiment of this invention. It is a typical perspective view which shows an example of the peeling form of the peeling film of embodiment of this invention. It is a typical perspective view which shows the other example of the peeling form of the peeling film of embodiment of this invention. It is a schematic diagram which shows the structure of the 1st adhesive laminated body of embodiment of this invention. It is typical sectional drawing which shows the usage method of the 1st adhesive laminated body of embodiment of this invention in order of a process. It is typical sectional drawing which shows the usage method of the 1st adhesive laminated body of embodiment of this invention in order of a process. It is typical sectional drawing which shows the usage method of the 1st adhesive laminated body of embodiment of this invention in order of a process. It is a schematic diagram which shows the structure of the 2nd adhesive laminated body of embodiment of this invention. It is a schematic diagram which shows the structure of the 3rd adhesive laminated body of embodiment of this invention. It is a schematic plan view which shows the 1st base material of the 3rd adhesive laminated body of embodiment of this invention. It is a typical top view showing the 2nd substrate of the 3rd adhesive layered product of an embodiment of the present invention. It is typical sectional drawing which shows the usage condition of the 3rd adhesive laminated body of embodiment of this invention. It is a schematic diagram which shows the structure of the 4th adhesive laminated body of embodiment of this invention. It is typical sectional drawing which shows the usage condition of the 4th adhesive laminated body of embodiment of this invention. It is a schematic diagram which shows the structure of the 5th adhesive laminated body of embodiment of this invention.

Below, based on suitable embodiment shown to an accompanying drawing, the peeling film and adhesive laminated body of this invention are demonstrated in detail.
In the following, “to” indicating a numerical range includes numerical values written on both sides. For example, when ε is a numerical value α to a numerical value β, the range of ε is a range including the numerical value α and the numerical value β, and expressed by mathematical symbols, α ≦ ε ≦ β.
“Same” includes an error range generally allowed in the technical field. In addition to “100%”, “all” includes an error range generally accepted in the technical field, for example, 99% or more, 95% or more, or 90% or more. Shall be.
Unless otherwise specified, angles such as “parallel” and “orthogonal” mean that the difference from the exact angle is within a range of less than 5 °. The difference from the exact angle is preferably less than 4 °, more preferably less than 3 °.

Optically transparent and simply transparent are both light transmittances of at least 60%, preferably 80% or more, more preferably 85% or more, in the visible light wavelength range of 400 to 800 nm. Even more preferably, it is 90% or more.
The light transmittance is measured by using, for example, “plastic—how to obtain total light transmittance and total light reflectance” defined in JIS K 7375: 2008.

  FIG. 1 is a schematic view showing the configuration of the release film of the embodiment of the present invention, and FIG. 2 is a schematic plan view showing the substrate of the release film of the embodiment of the present invention. FIG. 3 is a schematic perspective view showing an example of the peeling form of the release film of the embodiment of the present invention, and FIG. 4 is a schematic perspective view showing another example of the release form of the release film of the embodiment of the invention. is there.

The release film 10 shown in FIG. 1 has a base material 12 and a release layer 14 provided on the surface 12a of the base material 12. As shown in FIG. 2, the base material 12 has a plurality of linear irregularities 16 extending in one direction on the surface 12a, for example, in the x direction. In FIG. 2, the symbol y indicates another direction orthogonal to one direction. Hereinafter, one direction is also referred to as the x direction, and the other direction is also referred to as the y direction. In the field of films and the like, the x direction is called MD (Machine Direction), and the y direction is called TD (Transverse Direction).
The plurality of linear irregularities 16 mean an infinite number of linear fine grooves provided by scraping the surface 12a of the substrate 12 in a single direction. The plurality of linear irregularities 16 are stripe-like patterns extending in one direction. The plurality of linear irregularities 16 is one type of metal surface treatment, and is a polishing streak that is thinly arranged in parallel.

The release film 10 has peel strength anisotropy having different peel strengths in two orthogonal directions, and the peel strength between the pressure-sensitive adhesive tape and the release layer measured by a peel test using the pressure-sensitive adhesive tape is a plurality of linear irregularities. There is a difference of 1.8 times or more in one direction in which 16 extends and in another direction orthogonal to one direction, that is, in the x direction and the y direction. That is, the peel strength ratio is 1.8 or more.
Specifically, as shown in FIG. 4, the adhesive layer 18 is provided on the release layer 14 as shown in FIG. 4, and the adhesive layer 18 is provided on the release layer 14 as shown in FIG. When the layer 18 is provided and peeled along the y direction, the second peel strength is stronger, and in the peel film 10, the second peel strength is 1.8 times or more than the first peel strength. . That is, (second peel strength) / (first peel strength) ≧ 1.8.

When (second peel strength) / (first peel strength) is less than 1.8 times, tunneling tends to occur when a support with an adhesive is applied to the release film and wound. Moreover, the release film 10 is easily peeled off during punching, and it is difficult to punch a complicated shape.
If the peel strength is too strong due to the concavo-convex shape, air easily enters when a support with an adhesive is applied and wound. Further, if the peel strength is too strong, zipping occurs and the peel strength cannot be measured, but the second peel strength is made as strong as possible with respect to the first peel strength within a range where the second peel strength can be measured. However, the above-described effect is increased.
The (second peel strength) / (first peel strength) is preferably about 7 times or less.

  The definition of peel strength will be described. The peel strength is based on JIS Z0237: 2009, and a polyester adhesive tape “No. 31B (product number)” manufactured by Nitto Denko Co., Ltd. is applied to the release-treated surface, that is, the release layer, using a 2 kg roller, and applied for 30 minutes. Then, the force when peeling the adhesive tape from the release layer was measured under the conditions of a peel angle of 180 ° and a peel speed of 0.3 m / min.

  When the maximum height of the surface 12a of the substrate 12 is Rz (μm) and the average length is Rsm (mm), it is preferable that 20 ≦ Rz (μm) / Rsm (mm) ≦ 50. Thereby, the peel strength ratio can be increased to 1.8 times or more.

The maximum height Rz (μm) indicates the maximum value of the irregularities on the surface 12a of the substrate 12, and the average length Rsm (mm) is the average period of irregularities in the y direction on the surface 12a of the substrate 12 ( mm). The peel strength anisotropy can be obtained by adjusting the maximum height Rz (μm) and the average length Rsm (mm) so as to fall within the above-mentioned range.
When the maximum height Rz (μm) is small, the peel strength difference is small, and when the maximum height Rz (μm) is large, the peel strength difference is large.
On the other hand, when average length Rsm (mm) is short, the average period of the unevenness | corrugation of ay direction will become small, and peeling strength difference will become large. When the average length Rsm (mm) is long, the average period of unevenness in the y direction increases, and the peel strength difference decreases.

When the maximum height Rz (μm), which is a combination that reduces the peel strength difference, is small and the average length Rsm (mm) is long, the value of Rz (μm) / Rsm (mm) is small. When the maximum height Rz (μm), which is a combination that increases the peel strength difference, is large and the average length Rsm (mm) is short, the value of Rz (μm) / Rsm (mm) increases.
The balance between the maximum height Rz (μm) and the average length Rsm (mm) is important. When the value of Rz (μm) / Rsm (mm) is small, the second peel strength is particularly small, and Rz (μm ) / Rsm (mm) is large, the second peel strength is particularly large.

When Rz (μm) / Rsm (mm) is less than 20, since the second peel strength is particularly weak, the value of (second peel strength) / (first peel strength) is small.
When Rz (μm) / Rsm (mm) exceeds 50, the second peel strength is particularly too strong, causing zipping, which is not preferable.
Therefore, the value of Rz (μm) / Rsm (mm) is preferably in the range of 20-50.

The average length Rsm is preferably 0.01 to 0.2 mm. A material having an Rsm of less than 0.01 mm has poor productivity and is not practical. If the average length Rsm exceeds 0.2 mm, zipping tends to occur, which is not preferable.
The maximum height Rz is preferably 0.2 to 10 μm.

  The maximum height Rz (μm) and average length Rsm (mm) are both measured using a contact-type surface roughness measuring machine (Surfcoder “SE-500”, manufactured by Kosaka Laboratories) based on JIS B0601 (2001). It is what is done. Note that Rz (μm) and Rsm (mm) are not values obtained by measuring one point, but both ends (positions of 100 mm from the end toward the center), center (width) in the y direction of the measurement sample. A sample having a width of 3 cm and a length of 1 cm is cut out from the intermediate point of length / 2, and the average value of the measured values at these three points.

The substrate 12 is made of, for example, polyester such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), polycarbonate (PC), polymethyl methacrylate (PMMA), cycloolefin polymer (COP), triacetyl cellulose (TAC), poly It can be composed of arylate (PAR), polysulfone (PSU), polystyrene (PS) or the like.
Moreover, it is preferable that the base material 12 is 12-300 micrometers in thickness t (refer FIG. 1). The thickness t of the substrate 12 can be measured using a thickness meter.

The release layer 14 is provided on the surface 12 a of the substrate 12. As shown in FIGS. 3 and 4, the release film 10 is peeled off at the interface between the release layer 14 and the adhesive layer 18. At this time, it is preferable that the release layer 14 does not remain in the adhesive layer 18. The peeling layer 14 is not particularly limited as long as it functions as a peeling interface. The release layer 14 is made of, for example, a silicone resin or a fluorine resin. Specifically, in the case of a silicone resin, a coating solution obtained by adding 1.5 parts of SRX212P (product name: Toray Dow Corning) as a curing catalyst to 100 parts of LTC750 manufactured by Toray Dow Corning is coated and dried by gravure coating. The release layer has a coating amount of 0.5 μm.
In the case of a fluorine-based release resin, a coating solution obtained by diluting Daikin GF-501 (product number) is applied and dried by gravure coating to form a release layer having a coating amount of 0.5 μm.

  When the release film 10 is peeled off, it may be peeled off along the x direction in which a plurality of linear irregularities 16 extend, that is, MD (Machine Direction), and the x direction has a low peel strength, so that it is beautiful without zipping. The quality of the object to be attached is not deteriorated. Further, the y direction orthogonal to the x direction in which the plurality of linear irregularities 16 extend, that is, TD (Transverse Direction), has a high peel strength, so that the probability that the peelable film 10 is peeled can be reduced.

The method for forming the plurality of linear irregularities 16 on the surface 12a of the substrate 12 is not particularly limited. Specifically, the surface 12a of the substrate 12 is cut into a line in a single direction to form innumerable linear fine grooves.
The linear ultra-fine groove processing is performed by using a hairline processing machine, for example, by rubbing a hairline polishing material in which abrasive grains are adhered to a nonwoven fabric, or a metal brush or the like on the surface 12a of the substrate 12 in one direction. Form ultrafine grooves.

Next, the 1st adhesive laminated body which has a peeling film is demonstrated.
FIG. 5 is a schematic view showing the configuration of the first pressure-sensitive adhesive laminate according to the embodiment of the present invention. 6-8 is typical sectional drawing which shows the usage method of the 1st adhesive laminated body of embodiment of this invention in order of a process.
In addition, the 1st adhesive laminated body 20 (henceforth an adhesive laminated body 20) shown in FIG. 5 is the same as that of the peeling film 10 shown in FIG.1, FIG.2, FIG.3 and FIG. Reference numerals are assigned and detailed description thereof is omitted.

A pressure-sensitive adhesive laminate 20 shown in FIG. 5 has a pressure-sensitive adhesive layer 22 provided on the surface 14a of the release layer 14 as compared to the release film 10 (see FIG. 1). Are different from each other through the release layer 14, and the other configuration is the same as that of the release film 10 (see FIG. 1), and thus detailed description thereof is omitted.
The adhesive layer 22 is not particularly limited as long as it can be attached to the object 50 to which the adhesive laminate 20 is attached.
For the pressure-sensitive adhesive layer 22, for example, an optically transparent pressure-sensitive adhesive called OCA (Optically Clear Adhesive) is used. In this case, the pressure-sensitive adhesive layer 22 becomes an optical transparent adhesive layer. When an optically transparent pressure-sensitive adhesive is used for the pressure-sensitive adhesive layer 22, the object 50 can be visually recognized if the substrate 12 and the release layer 14 are made of a transparent material.
The object 50 is, for example, various optical films such as an optical filter, a light absorbing plate, a light diffusing plate, a polarizing plate, a touch sensor, an antenna, an electromagnetic wave shield, and a decorative film. Furthermore, the target object 50 may be, for example, a glass, hard-coated polyethylene terephthalate, a metal, an alloy, or a processed product such as a building material. The object 50 may be a semi-finished product that is being manufactured. The pressure-sensitive adhesive layer 22 preferably has a thickness of about 10 to 500 μm.

For example, as shown in FIG. 6, the pressure-sensitive adhesive laminate 20 is attached to the object 50 with the pressure-sensitive adhesive layer 22 facing. And the peeling film 10 is peeled off by making the surface 14a of the peeling layer 14 into an interface, and the adhesive layer 22 is left in the target object 50 as shown in FIG. Thereafter, another object 52 is attached to the pressure-sensitive adhesive layer 22 as shown in FIG. In this way, the object 50 and the object 52 can be pasted. The object 52 may be the same as or different from the object 50, and is not particularly limited.
In the pressure-sensitive adhesive laminate 20, when the release film 10 is peeled off, if it is peeled along the x direction (see FIG. 3) where the peel strength is weak, it can be peeled cleanly without causing zipping. There is no deterioration in quality. Moreover, since the peel strength is strong in the y direction (see FIG. 4), the probability that the release film 10 is peeled can be reduced.

In addition, if it is set as the state which affixed the adhesive laminated body 20 to the target object 50 as shown in FIG. 6, the adhesive laminated body 20 functions as a protective film which protects the target object 50. FIG.
As shown in FIG. 6, the probability that the release film 10 is peeled off as described above can be reduced even if the adhesive laminate 20 is attached to the object 50 and transported or stored. If it is a product, it will be prevented from being damaged at the time of conveyance to the next process, and the object 50 can be stably protected during storage.

The pressure-sensitive adhesive laminate 20 has peel strength anisotropy having different peel strengths in two directions orthogonal to each other, as in the above-described release film 10, and (second peel strength) / (first peel strength) is It is 1.8 times or more. Thereby, the peeling film 10 can be made difficult to peel off at the time of punching. For this reason, the punching process of a complicated shape can be performed.
Furthermore, when the pressure-sensitive adhesive laminate 20 is applied in the x direction (see FIG. 2), that is, in the length direction of the linear fine grooves, it is difficult for air to enter, and it is difficult for air to enter during application. Even when the pressure-sensitive adhesive laminate 20 is wound, when it is wound along the x direction (see FIG. 2), that is, along the length direction of the linear ultrafine groove, it depends on the circumferential length difference between the pressure-sensitive adhesive layer 22 and the substrate 12. Wrinkles and tunneling are less likely to occur.

Next, a 2nd adhesive laminated body is demonstrated.
FIG. 9 is a schematic view showing the configuration of the second pressure-sensitive adhesive laminate according to the embodiment of the present invention.
Note that the second pressure-sensitive adhesive laminate 20a shown in FIG. 9 (hereinafter simply referred to as the pressure-sensitive adhesive laminate 20a) is the same as the release film 10 shown in FIGS. 1, 2, 3, and 4 in the same configuration. Reference numerals are assigned and detailed description thereof is omitted. Moreover, the same code | symbol is attached | subjected to the same structure as the adhesive laminated body 20 shown in FIG. 5 and FIGS. 6-8, and the detailed description is abbreviate | omitted.

The pressure-sensitive adhesive laminate 20a shown in FIG. 9 has a pressure-sensitive adhesive layer 22 provided on the surface 14a of the release layer 14 and a support 24 as compared to the release film 10 (see FIG. 1). Since the release layer 14 is directed to the pressure-sensitive adhesive layer 22 and the release film 10 and the support 24 are laminated, the other configuration is the same as that of the release film 10 (see FIG. 1). Detailed description thereof will be omitted.
Since the pressure-sensitive adhesive layer 22 is the same as the pressure-sensitive adhesive layer 22 of the pressure-sensitive adhesive laminate 20, the detailed description thereof is omitted.

The support 24 supports the pressure-sensitive adhesive layer 22, and the pressure-sensitive adhesive layer 22 is provided on one surface. In the pressure-sensitive adhesive laminate 20a, the release film 10 is peeled off using the surface 14a of the release layer 14 as an interface. In this case, for example, the support 24 functions as a protective film including the pressure-sensitive adhesive layer 22. The support 24 is not particularly limited as long as it can support the pressure-sensitive adhesive layer 22.
The support 24 is made of, for example, polyester such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), polycarbonate (PC), polymethyl methacrylate (PMMA), cycloolefin polymer (COP), It can be composed of acetylcellulose (TAC), polyarylate (PAR), polysulfone (PSU), polystyrene (PS), and the like.

In the pressure-sensitive adhesive laminate 20a, if the release film 10 is peeled off and the pressure-sensitive adhesive layer 22 is attached to the object 50 (see FIG. 6), it functions as a protective film for protecting the object 50. In this case, as with the pressure-sensitive adhesive laminate 20, the stable object 50 can be protected.
In the pressure-sensitive adhesive laminate 20a, when peeling off the release film 10, if it is peeled along the x direction (see FIG. 3) where the peel strength is weak, it can be peeled cleanly without causing zipping. There is no deterioration in quality. Moreover, since the peel strength is strong in the y direction (see FIG. 4), the probability that the release film 10 is peeled can be reduced.
Moreover, when the pressure-sensitive adhesive laminate 20a is punched according to the shape of the object to be pasted, the release film 10 can be made difficult to peel off. For this reason, the punching process of a complicated shape can be performed.
Furthermore, when the adhesive laminate 20a is applied in the x direction (see FIG. 2), that is, in the length direction of the linear fine grooves, it is difficult for air to enter, and it is difficult for air to enter during application. Even when the pressure-sensitive adhesive laminate 20a is wound, if it is wound in the x direction (see FIG. 2), that is, in the length direction of the linear ultrafine groove, it depends on the difference in the circumferential length between the pressure-sensitive adhesive layer 22 and the substrate 12. Wrinkles and tunneling are less likely to occur.

Next, a 3rd adhesive laminated body is demonstrated.
FIG. 10 is a schematic diagram showing the configuration of the third pressure-sensitive adhesive laminate of the embodiment of the present invention, and FIG. 11 is a schematic diagram showing the first substrate of the third pressure-sensitive adhesive laminate of the embodiment of the present invention. FIG. 12 is a schematic plan view showing a second substrate of the third pressure-sensitive adhesive laminate of the embodiment of the present invention, and FIG. 13 is a third pressure-sensitive adhesive of the embodiment of the present invention. It is typical sectional drawing which shows the usage condition of an agent laminated body.
Note that the third pressure-sensitive adhesive laminate 20b shown in FIG. 10 (hereinafter simply referred to as the pressure-sensitive adhesive laminate 20b) has the same constituents as those of the release film 10 shown in FIG. 1, FIG. 2, FIG. 3, and FIG. Reference numerals are assigned and detailed description thereof is omitted.

The adhesive laminate 20b shown in FIG. 10 has a pair of the first release film 11a, the second release film 11b, and the adhesive layer 22 as compared to the release film 10 (see FIG. 1). The other configuration is the same as that of the release film 10 (see FIG. 1), and thus detailed description thereof is omitted.
As for the 1st peeling film 11a, the 1st base material 30 and the peeling layer 34 are laminated | stacked. In the second release film 11b, a second substrate 32 and a release layer 36 are laminated.
The first base material 30 shown in FIG. 11 has the same configuration as the base material 12 of the release film 10, and the surface 30a of the first base material 30 has, for example, a plurality of linear irregularities 16 extending in the x direction. Is formed.
The second base material 33 shown in FIG. 12 has the same configuration as the base material 12 of the release film 10, and the surface 32 a of the second base material 32 has, for example, a plurality of linear irregularities 16 extending in the y direction. Is formed. Since the plurality of linear irregularities 16 have the same configuration as the plurality of linear irregularities 16 of the substrate 12 of the release film 10, detailed description thereof is omitted.
Since the release layer 34 and the release layer 36 have the same configuration as the release layer 14 of the release film 10, detailed description thereof is omitted.
Since the pressure-sensitive adhesive layer 22 is the same as the pressure-sensitive adhesive layer 22 of the pressure-sensitive adhesive laminate 20, the detailed description thereof is omitted.

In the pressure-sensitive adhesive laminate 20b shown in FIG. 10, a pair of first release film 11a and second release film 11b are provided and laminated on both sides of the pressure-sensitive adhesive layer 22. The release layer 34 of the first release film 11 a and the release layer 36 of the second release film 11 b are directed to the pressure-sensitive adhesive layer 22.
In the pressure-sensitive adhesive laminate 20b shown in FIG. 10, the pair of the first release film 11a and the second release film 11b are peeled off, and, for example, as shown in FIG. It can be used for pasting only the pressure-sensitive adhesive layer 22. When affixed only with the pressure-sensitive adhesive layer 22, the transmittance can be increased by using an optically transparent pressure-sensitive adhesive for the pressure-sensitive adhesive layer 22. For example, when the object 50 and the object 52 are transparent, the visibility can be increased. When the object 52 is transparent, the visibility of the object 50 can be increased.

The adhesive laminate 20b shown in FIG. 10 also has peel strength anisotropy having different peel strengths in two orthogonal directions, like the above-described release film 10, and (second peel strength) / (first peel) (Strength) is 1.8 times or more. Thereby, since the probability that the peeling layers 34 and 36 peel at the time of conveyance and storage can be reduced, the protection of the target object 50 (refer FIG. 6) becomes possible. Moreover, it can be made difficult to peel off by the release layers 34 and 36 in the punching process according to the shape of the object to be attached. For this reason, the punching process of a complicated shape can be performed.
Furthermore, when the adhesive laminate 20b is applied in the x direction (see FIG. 2), that is, in the length direction of the linear fine grooves, it is difficult for air to enter, and it is difficult for air to enter during application. Even when the pressure-sensitive adhesive laminate 20 is wound, if it is wound in the x direction (see FIG. 2), that is, in the length direction of the linear ultrafine groove, wrinkles and tunneling due to the difference in circumferential length between the pressure-sensitive adhesive layer and the substrate Is unlikely to occur.

In the first base material 30 and the second base material 32, the directions in one direction in which the plurality of linear irregularities 16 extend may be the same or different, and are not particularly limited. For example, if the direction of one extending direction is the same, the plurality of linear irregularities 16 are arranged in parallel. If the extending directions are different, they are arranged at a predetermined angle. However, when the peel strength anisotropy is utilized, it is preferable that the directions in one direction in which the plurality of linear irregularities 16 extend are orthogonal. By making it orthogonal, when peeling the 1st peeling film 11a, force acts on the 2nd peeling film 11b in the direction where peeling strength is high by peeling in the direction where peeling strength is weak. For this reason, it is suppressed that the 2nd peeling film 11b peels. In this case, if the peeling direction with respect to the plurality of linear irregularities 16 is determined in advance, the first peeling film 11a and the second peeling film 11b can be peeled with the same force.
In the adhesive laminate 20b, when the first release film 11a and the second release film 11b are peeled off along the x direction (see FIG. 3) where the peel strength is weak, it is beautiful without causing zipping. The quality of the object to be attached is not deteriorated. Moreover, since the peeling strength is strong in the y direction (see FIG. 4), the probability that the first peeling film 11a and the second peeling film 11b are peeled can be reduced.

Next, a 4th adhesive laminated body is demonstrated.
FIG. 14 is a schematic view showing the configuration of the fourth pressure-sensitive adhesive laminate according to the embodiment of the present invention, and FIG. 15 is a schematic cross-sectional view showing the usage pattern of the fourth pressure-sensitive adhesive laminate according to the embodiment of the present invention. It is.
In addition, the 4th adhesive laminated body 20c (henceforth an adhesive laminated body 20c) shown in FIG. 14 attaches | subjects the same code | symbol to the same structure as the adhesive laminated body 20b shown in FIGS. Detailed description thereof will be omitted.

  The pressure-sensitive adhesive laminate 20c shown in FIG. 14 is provided with a pressure-sensitive adhesive layer on both surfaces of the support 24 as compared with the pressure-sensitive adhesive laminate 20b (see FIG. 10). Since the release film and the support are laminated so as to be directed to the layers, the other configuration is the same as that of the pressure-sensitive adhesive laminate 20b (see FIGS. 10 to 13). Description is omitted.

The pressure-sensitive adhesive laminate 20 c includes a first release film 11 a, a first pressure-sensitive adhesive layer 40, a second release film 11 b, a second pressure-sensitive adhesive layer 42, and a support 24.
In the pressure-sensitive adhesive laminate 20c, the first pressure-sensitive adhesive layer 40 and the second pressure-sensitive adhesive layer 42 are provided on both surfaces of the support 24, respectively, and the release layer 34 of the first release film 11a is the first release layer 34. The release layer 36 of the second release film 11b is directed to the second adhesive layer 42, and the first release film 11a, the support 24, and the second release film 11b are directed to the adhesive layer 40. Are stacked.

Since the 1st adhesive layer 40 and the 2nd adhesive layer 42 are the same as the adhesive layer 22 of the above-mentioned adhesive laminated body 20, the detailed description is abbreviate | omitted.
The support 24 supports the first pressure-sensitive adhesive layer 40 and the second pressure-sensitive adhesive layer 42. Since the support 24 has the same configuration as the support 24 of the above-described pressure-sensitive adhesive laminate 20a, detailed description thereof will be omitted. By providing the first pressure-sensitive adhesive layer 40 and the second pressure-sensitive adhesive layer 42 on both surfaces of the support 24, for example, an appropriate pressure-sensitive adhesive can be selected for each of the objects 50 and 52, and the pressure-sensitive adhesive force is also targeted. It can also select suitably according to the thing 50 and 52 or a use.
The pressure-sensitive adhesive laminate 20c, for example, as shown in FIG. 15, can be used for attaching the object 50 and the object 52 with the support 24 interposed therebetween. In this case, the support 24 is between the object 50 and the object 52.

The adhesive laminate 20c shown in FIG. 14 also has peel strength anisotropy having different peel strengths in two orthogonal directions, like the above-described release film 10, and (second peel strength) / (first peel) (Strength) is 1.8 times or more. Thereby, since the probability that the peeling layers 34 and 36 will peel at the time of conveyance and storage can be reduced, it becomes possible to protect the object 50 stably. Moreover, it can be made difficult to peel off by the release layers 34 and 36 in the punching process according to the shape of the object to be attached. For this reason, the punching process of a complicated shape can be performed.
Furthermore, when the adhesive laminate 20c is applied in the x direction (see FIG. 2), that is, in the length direction of the linear ultrafine groove, it is difficult for air to enter, and it is difficult for air to enter during application. Even when the pressure-sensitive adhesive laminate 20 is wound, if it is wound in the x direction (see FIG. 2), that is, in the length direction of the linear ultrafine groove, wrinkles and tunneling due to the difference in circumferential length between the pressure-sensitive adhesive layer and the substrate Is unlikely to occur.

Even in the pressure-sensitive adhesive laminate 20c, the direction in which the plurality of linear irregularities 16 of the first base material 30 and the second base material 32 extend is the same as the pressure-sensitive adhesive laminate 20b shown in FIG. It may be different or different, and is not particularly limited. Since the direction of the one direction in which the plurality of linear irregularities 16 of the first base material 30 and the second base material 32 extend can be the same as that of the pressure-sensitive adhesive laminate 20b shown in FIG. 10, detailed description thereof is omitted. To do.
Further, for example, when considering the above-described various optical films as the object 50 and the object 52, an optically transparent film or substrate is used for the support 24, and the first adhesive layer 40 and the first It is preferable to increase the transmittance by using an optically transparent adhesive for the second adhesive layer 42.

Next, a 5th adhesive laminated body is demonstrated.
FIG. 16 is a schematic diagram showing the configuration of the fifth pressure-sensitive adhesive laminate according to the embodiment of the present invention.
Note that, in the fifth pressure-sensitive adhesive laminate 20d shown in FIG. 16 (hereinafter simply referred to as the pressure-sensitive adhesive laminate 20d), the same components as those in the pressure-sensitive adhesive laminate 20c shown in FIGS. Detailed description thereof will be omitted.

  The adhesive laminate 20d shown in FIG. 16 differs from the adhesive laminate 20c (see FIG. 14) in that a functional film 25 is provided in place of the support 24, and the other configurations are the same. Since it has the same configuration as the pressure-sensitive adhesive laminate 20c (see FIG. 14), detailed description thereof is omitted.

The functional film 25 is, for example, various optical films such as an optical filter, a light absorbing plate, a light diffusing plate, a polarizing plate, a touch sensor, an antenna, an electromagnetic wave shield, and a decorative film.
The functional film 25 may be a substrate (not shown). This substrate is made of, for example, glass, hard-coated polyethylene terephthalate, metal, alloy, or the like. The substrate may be a processed product such as a building material. The substrate may be a semi-finished product that is being manufactured.

  The present invention is basically configured as described above. The release film and the pressure-sensitive adhesive laminate of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiment, and various improvements or modifications may be made without departing from the gist of the present invention. Of course it is good.

  Hereinafter, the present invention will be described more specifically with reference to examples of the present invention. In addition, the material, usage-amount, ratio, processing content, processing procedure, etc. which are shown in the following Examples can be changed suitably unless it deviates from the meaning of this invention. Accordingly, the scope of the present invention should not be construed as being limited by the specific examples shown below.

In this example, the release films of Examples 1 to 6 and the release films of Comparative Examples 1 to 4 were prepared, and the peel strengths in two orthogonal directions were measured, and (second peel strength) / (first peel) The peel strength ratio represented by (strength) was determined. The results are shown in Table 1 below. In Table 1, “-” indicates that evaluation cannot be performed.
The peel strength is based on JIS Z0237: 2009, and a polyester adhesive tape “No. 31B (product number)” manufactured by Nitto Denko Co., Ltd. is applied to the release-treated surface, that is, the release layer, using a 2 kg roller, and applied for 30 minutes. Then, the force when peeling the adhesive tape from the release layer was measured under the conditions of a peel angle of 180 ° and a peel speed of 0.3 m / min.
The structure of the release film of Examples 1-6 and the release film of Comparative Examples 1-4 is the same structure as the release film 10 shown in FIG. 1, and the release layer is formed on the surface of the base material.

The visual test was done about the peeling film of Examples 1-6 and the peeling film of Comparative Examples 1-4. The results are shown in Table 1 below.
In the visual test, an adhesive layer and a support are laminated in this order on the release layers of the release films of Examples 1 to 6 and the release films of Comparative Examples 1 to 4, and the adhesive laminate 20a shown in FIG. The product in the state of the above structure was wound, and the appearance at this time was visually evaluated.
In the visual test, the release films of Examples 1 to 6 and the release films of Comparative Examples 1 to 4 were each wound up by 1 m on a plastic core having an outer diameter of 90 mm, and then unwound 2 hours later to visually check for the occurrence of tunneling. Confirmed with.
In the evaluation of the visual test, “A” was defined as something that could be wound without any occurrence during winding, and “B” was defined as something that occurred during winding. As for “B”, Table 1 also describes what happened during winding.
Thus, the above-mentioned pressure-sensitive adhesive layer and support are formed for the visual test, and do not constitute the release films of Examples 1 to 6 and the release films of Comparative Examples 1 to 4.

Hereinafter, the pressure-sensitive adhesive layer and the support used in the visual test will be described.
Methyl ethyl ketone was added to 100 parts of a butyl acrylate pressure-sensitive adhesive having an acrylic acid functional group and a solid content concentration of 30% to adjust the viscosity to 2,000 mPa · s. 0.5 parts of isocyanate having a solid concentration of 55% was added as a crosslinking agent to obtain a pressure-sensitive adhesive composition. This pressure-sensitive adhesive composition was applied and dried on a release film of Examples 1 to 6 and the release films of Comparative Examples 1 to 4 with a die coater so as to be 23 μm in a dry state. Formed. Thereafter, a polyethylene terephthalate support (Lumirror (registered trademark) S10, manufactured by Toray Industries, Inc.) having a thickness of 250 μm was laminated on the pressure-sensitive adhesive layer to obtain the same structure as the pressure-sensitive adhesive laminate 20a shown in FIG.

  Hereinafter, the release films of Examples 1 to 6 and the release films of Comparative Examples 1 to 4 will be described.

Example 1
As the substrate, a polyethylene terephthalate film (Lumirror (registered trademark) S10, manufactured by Toray Industries, Inc.) having a thickness of 50 μm was used.
The surface of the substrate was subjected to linear ultrafine groove processing to form a plurality of linear irregularities extending in one direction. One direction was matched with the length direction. The length direction coincides with the x direction shown in FIG.
The linear ultrafine groove was performed using a sand paper using a hairline processing machine. The line length of the plurality of linear irregularities was adjusted to about 80 mm based on the contact time between the sandpaper and the substrate. The line length is a setting of the hairline processing machine.
Then, a sample having a width of 3 cm × a length of 1 cm is cut out from both ends (position of 100 mm from the end toward the center) and from the center (intermediate point of width length / 2), and the arithmetic average roughness of the surface of the base material at three points. Ra (μm), maximum height Rz (μm), and average length Rsm (mm) were measured.
Next, on the surface of the substrate, a silicone release agent was applied by gravure coating so as to have a thickness of 0.5 μm and dried to form a release layer to obtain a release film.
The silicone release agent is a coating liquid obtained by adding 1.5 parts of SRX212P (product name: Toray Dow Corning) as a curing catalyst to 100 parts of LTC750 manufactured by Toray Dow Corning. This coating solution was formed by applying and drying by gravure coating.

A method for measuring the arithmetic average roughness Ra (μm), the maximum height Rz (μm) and the average length Rsm (mm) of the surface of the substrate will be described.
First, the above-mentioned three points are set in advance along the width direction of the base material at the same position in the length direction of the base material, and the arithmetic average roughness Ra of the surface of the base material is set for the three points. (Μm), maximum height Rz (μm) and average length Rsm (mm) were measured based on JIS B0601 (2001) using a contact type surface roughness measuring machine (Surfcoder “SE500” manufactured by Kosaka Laboratory).
The average value of the arithmetic average roughness Ra (μm), the maximum height Rz (μm) and the average length Rsm (mm) at each measurement point is determined, and the average value is finally calculated as the arithmetic average roughness Ra (μm), The maximum height Rz (μm) and the average length Rsm (mm) were used. The results are shown in Table 1 below.
The arithmetic average roughness Ra was 0.088 μm, the maximum height Rz was 1.987 μm, and the average length Rsm was 0.090 mm. The value of Rz (μm) / Rsm (mm) was 22.
The first peel strength is the peel strength of MD (Machine Direction) shown in the x direction in FIG. The second peel strength is a peel strength of TD (Transverse Direction) shown in the y direction in FIG.

(Example 2)
Example 2 was produced in the same manner as Example 1 except that the line length was about 50 mm as compared to Example 1.
In Example 2, the arithmetic average roughness Ra was 0.188 μm, the maximum height Rz was 3.730 μm, the average length Rsm was 0.079 mm, and the value of Rz (μm) / Rsm (mm) was 47.
(Example 3)
Example 3 was produced in the same manner as Example 1 except that the line length was about 50 mm as compared to Example 1.
In Example 3, the arithmetic average roughness Ra was 0.118 μm, the maximum height Rz was 2.557 μm, the average length Rsm was 0.069 mm, and the value of Rz (μm) / Rsm (mm) was 37.

Example 4
Example 4 was produced in the same manner as Example 1 except that the line length was about 100 mm as compared to Example 1.
In Example 4, the arithmetic average roughness Ra was 0.150 μm, the maximum height Rz was 2.599 μm, the average length Rsm was 0.054 mm, and the value of Rz (μm) / Rsm (mm) was 48.
(Example 5)
Example 5 was produced in the same manner as Example 1 except that the line length was about 5 mm as compared to Example 1.
In Example 5, the arithmetic average roughness Ra was 0.094 μm, the maximum height Rz was 3.993 μm, the average length Rsm was 0.188 mm, and the value of Rz (μm) / Rsm (mm) was 21.
(Example 6)
Example 6 was produced in the same manner as in Example 1 except that a fluorine-based release agent was used instead of the silicone-based release agent as compared to Example 1.
As the fluorine-based release agent, a coating solution obtained by diluting GF-501 (product number) manufactured by Daikin was used.

(Comparative Example 1)
Comparative Example 1 was produced in the same manner as Example 1 except that the line length was about 130 mm as compared to Example 1.
In Comparative Example 1, the arithmetic average roughness Ra was 0.246 μm, the maximum height Rz was 11.248 μm, the average length Rsm was 0.208 mm, and the value of Rz (μm) / Rsm (mm) was 54.
(Comparative Example 2)
Comparative Example 2 was produced in the same manner as Example 1 except that the line length was about 80 mm as compared to Example 1.
In Comparative Example 2, the arithmetic average roughness Ra was 0.261 μm, the maximum height Rz was 8.008 μm, the average length Rsm was 0.158 mm, and the value of Rz (μm) / Rsm (mm) was 51.

(Comparative Example 3)
Comparative Example 3 was produced in the same manner as Example 1 except that the line length was about 50 mm as compared to Example 1.
In Comparative Example 3, the arithmetic average roughness Ra was 0.048 μm, the maximum height Rz was 1.214 μm, the average length Rsm was 0.120 mm, and the value of Rz (μm) / Rsm (mm) was 10.
(Comparative Example 4)
Comparative Example 4 was produced in the same manner as Example 1 except that the line length was about 15 mm as compared to Example 1.
In Comparative Example 4, the arithmetic average roughness Ra was 0.140 μm, the maximum height Rz was 4.440 μm, the average length Rsm was 0.229 mm, and the value of Rz (μm) / Rsm (mm) was 19.

As shown in Table 1, in Examples 1 to 6, the peel strength ratio was 1.8 times or more. In Examples 1 to 6, there was no problem with the visual test, and good results were obtained.
On the other hand, in Comparative Example 1, when the second peel strength was measured, it could not be peeled smoothly, zipping occurred, and the pressure-sensitive adhesive layer was wrinkled. Moreover, the value of Rz (μm) / Rsm (mm) was also large. In Comparative Example 2, when the second peel strength was measured, it could not be peeled smoothly, zipping occurred, and the pressure-sensitive adhesive layer was wrinkled. Moreover, the value of Rz (μm) / Rsm (mm) was also large. In Comparative Example 1 and Comparative Example 2, as a result of the visual test, air entered the MD direction between the release layer and the pressure-sensitive adhesive layer.
In Comparative Example 3, the peel strength ratio was less than 1.8 times, and the value of Rz (μm) / Rsm (mm) was small. In Comparative Example 4, the peel strength ratio was less than 1.8 times, and the value of Rz (μm) / Rsm (mm) was small. In Comparative Example 3 and Comparative Example 4, as a result of the visual test, tunneling occurred between the release layer and the pressure-sensitive adhesive layer.

DESCRIPTION OF SYMBOLS 10 Release film 11a 1st release film 11b 2nd release film 12 Base material 12a, 30a, 32a Surface 14 Release layer 16 Concavity and convexity 18 Adhesive layer 20 1st adhesive laminated body (adhesive laminated body)
20a Second adhesive laminate (adhesive laminate)
20b 3rd adhesive laminated body (adhesive laminated body)
20c 4th adhesive layered product (adhesive layered product)
20d 5th adhesive layered product (adhesive layered product)
DESCRIPTION OF SYMBOLS 22 Adhesive layer 24 Support body 25 Functional film 30 1st base material 32 2nd base material 34 1st peeling layer 36 2nd peeling layer 40 1st adhesive layer 42 2nd adhesive layer 50 , 52 Object t Thickness x direction y direction

Claims (11)

A substrate having a plurality of linear irregularities extending in one direction on the surface;
A release layer provided on the surface of the substrate;
The peel strength between the pressure-sensitive adhesive tape and the release layer, measured by a peel test using a pressure-sensitive adhesive tape, is the peel strength in the one direction in which the plurality of linear irregularities extend and in the other direction orthogonal to the one direction. A release film characterized by being different by 1.8 times or more.   2. The release film according to claim 1, wherein a maximum height Rz micrometer and an average length Rsm millimeter of the surface of the substrate satisfy 20 ≦ Rz / Rsm ≦ 50.   The release film according to claim 1, wherein the release layer is made of a silicone resin or a fluorine resin.   The release film according to claim 1, wherein the substrate is made of polyester.   The release film according to any one of claims 1 to 4, wherein the substrate has a thickness of 12 to 300 µm.   An adhesive comprising the release film according to claim 1 and an adhesive layer, wherein the substrate and the adhesive layer are laminated via the release layer. Agent laminate.   It has the peeling film of any one of Claims 1-5, and the support body in which the adhesive layer was provided in at least one surface, and the peeling layer of the said peeling film was turned to the said adhesive layer, The pressure-sensitive adhesive laminate, wherein the release film and the support are laminated.   The release film according to any one of claims 1 to 5 has a pair and an adhesive layer, the release film is provided on both sides of the adhesive layer, and the release layer of the pair of release films. Is directed to the pressure-sensitive adhesive layer.   The pressure-sensitive adhesive layer is provided on each side of the support, the release layer of the release film is directed to each pressure-sensitive adhesive layer, and the release film and the support are The pressure-sensitive adhesive laminate according to claim 7, which is laminated.   The pressure-sensitive adhesive laminate according to claim 8 or 9, wherein one release film substrate and the other release film substrate have different directions in one direction in which the linear irregularities extend.   The pressure-sensitive adhesive layered body according to claim 6, wherein the pressure-sensitive adhesive layer is an optical transparent adhesive layer.