WO2016084947A1 - 粘着シート - Google Patents
粘着シート Download PDFInfo
- Publication number
- WO2016084947A1 WO2016084947A1 PCT/JP2015/083444 JP2015083444W WO2016084947A1 WO 2016084947 A1 WO2016084947 A1 WO 2016084947A1 JP 2015083444 W JP2015083444 W JP 2015083444W WO 2016084947 A1 WO2016084947 A1 WO 2016084947A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- sensitive adhesive
- adhesive sheet
- layer
- resin
- Prior art date
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
Definitions
- the present invention relates to an adhesive sheet.
- This application claims priority based on Japanese Patent Application No. 2014-242183 filed on November 28, 2014 and Japanese Patent Application No. 2015-164269 filed on August 21, 2015. The entire contents of these applications are hereby incorporated by reference.
- a pressure-sensitive adhesive (also referred to as a pressure-sensitive adhesive, hereinafter the same) is in a soft solid (viscoelastic body) state in the temperature range near room temperature and has a property of easily adhering to an adherend by pressure.
- the pressure-sensitive adhesive is in the form of a pressure-sensitive adhesive sheet with a base material provided with a pressure-sensitive adhesive layer on at least one surface of the base material, for example, fixing various articles, surface protection of various articles, Alternatively, it is widely used for the purpose of obtaining a desired appearance such as decoration.
- Patent documents 1 and 2 are mentioned as literature which discloses this kind of conventional technology.
- a release liner that protects the pressure-sensitive adhesive surface of the pressure-sensitive adhesive sheet for the purpose of preventing the generation of such bubbles or the like and imparting the property of removing the generated bubbles or the like (hereinafter also referred to as “air venting”).
- Patent Document 1 A technique is known in which ridges are formed on the surface and grooves are formed on the surface of the pressure-sensitive adhesive layer of the sheet using the ridges. Air or the like that remains between the adhesive surface and the adherend can be removed from a groove formed on the surface of the adhesive layer.
- the method of forming a groove on the surface of the pressure-sensitive adhesive layer as described in Patent Document 1 limits the depth of the groove serving as a passage for air or the like depending on the thickness of the pressure-sensitive adhesive layer, and a release liner or the like. After removing the adhesive surface and exposing the adhesive surface, it takes time to bond to the adherend, so that the grooves are reduced or disappeared due to the viscoelasticity of the adhesive layer, and air bleedability cannot be obtained.
- Patent Document 2 describes that a non-adhesive layer is partially laminated on the surface of the pressure-sensitive adhesive layer. By using the surface of the non-adhesive layer as a passage such as air, air release properties can be obtained. It is supposed to secure. However, the contact state between the non-adhesive layer and the pressure-sensitive adhesive layer and the influence of the contact state on the quality of the pressure-sensitive adhesive sheet have not been studied.
- the present inventors have examined the improvement of the quality of a pressure-sensitive adhesive sheet comprising a coat layer that partially covers the surface of the pressure-sensitive adhesive layer, and paying attention to the shape (cross-sectional shape) in the thickness direction of the coat layer. It came to complete. That is, the present invention relates to an improvement in the pressure-sensitive adhesive sheet in which a coating layer as an air escape means is partially disposed on the surface of the pressure-sensitive adhesive layer, and a coating layer having a novel cross-sectional shape that easily fits the pressure-sensitive adhesive.
- An object of the present invention is to provide a pressure-sensitive adhesive sheet that can be further improved in quality while having good air escape properties.
- an adhesive sheet provided with a film-form base material and the adhesive layer provided on the at least one surface of this film-form base material is provided.
- the pressure-sensitive adhesive sheet further includes a coat layer that partially covers the surface of the pressure-sensitive adhesive layer.
- the adhesive surface of the pressure-sensitive adhesive sheet is constituted by the pressure-sensitive adhesive layer and the coat layer.
- the coat layer has a portion extending linearly from one end of the adhesive surface to the other end.
- the linearly extending portion includes a first surface that constitutes an adhesive surface of the pressure-sensitive adhesive sheet, and a second surface that is located on the pressure-sensitive adhesive layer side with respect to the first surface.
- the 2nd surface of the part extended in the said linear form is comprised by the gentle curve as a whole in the cross section orthogonal to the longitudinal direction of this linearly extended part.
- the viscoelastic body constituting the pressure-sensitive adhesive layer is easily fitted to the coat layer having the cross-sectional shape as described above. Therefore, for example, even if the surface pattern and thickness of the coat layer are the same, those provided with the coat layer having the above-mentioned cross-sectional shape, and the surface state of the adhesive layer and the adhesive layer It can be in excellent contact with the coat layer. Therefore, according to the said structure, in a pressure sensitive adhesive sheet provided with the coat layer which partially covers the surface of a pressure sensitive adhesive layer, further quality improvement is attained, obtaining favorable air escape property.
- the effect of the present invention is obtained by the novel cross-sectional shape of the coat layer, and thus the pressure-sensitive adhesive component and the coat layer material are not limited. This can bring about an effect of eliminating the restriction of the material used, for example, in Patent Document 1, in which a relatively hard material is used as an adhesive to maintain the shape of the groove.
- “consisting of a gentle curve as a whole” means that a gentle curve is drawn as a whole, and a part (for example, the bottom surface of the coat layer, etc.) has a straight line. May be.
- a magnification of 10,000 times specifically, an SEM (scanning electron microscope) or TEM (transmission electron microscope) cross-sectional image of a portion of the coat layer extending linearly at a magnification of 10,000 times
- the second surface of the linearly extending portion starts from one end of the linearly extending portion in a cross section perpendicular to the longitudinal direction of the linearly extending portion. As it goes to the center, it has a portion extending in the depth direction of the pressure-sensitive adhesive layer with a gentle curve.
- the one end is typically both ends, and the portion extending in the depth direction of the pressure-sensitive adhesive layer along the gentle curve can be rephrased as an end portion or both end portions (one end portion and the other end portion).
- the pressure-sensitive adhesive fits well to the coat layer. Since the said edge part can comprise the adhesion surface of an adhesive sheet fundamentally, the said edge part being high quality leads to that the adhesion surface is high quality.
- “extending in the depth direction of the pressure-sensitive adhesive layer with a gentle curve toward the center starting from one end of the linearly extending portion” is limited to a specific inclination angle or curved shape.
- one end of the linearly extending portion is started from a line segment that forms the second surface of the linearly extending portion.
- the depth of the second surface at a point advanced by X ⁇ m from the one end toward the center is less than 1 / ⁇ 2 X ⁇ m (preferably less than 1 / ⁇ 3 X ⁇ m, more preferably less than 1/2 X ⁇ m, for example, less than 1/3 X ⁇ m).
- the depth of the second surface of the linearly extending portion refers to the depth of the second surface with respect to the pressure-sensitive adhesive layer outer surface (strictly speaking, a virtual plane formed by the pressure-sensitive adhesive layer outer surface).
- X is a positive integer whose upper limit is 1 ⁇ 2 of the width of the linearly extending portion. For example, when the thickness of the linearly extending portion of the coat layer is less than 3 ⁇ m, the second surface of the linearly extending portion is configured in the range where X is 10 ⁇ m or less (more specifically, the range is 5 ⁇ m or less).
- the depth of the second surface is less than 1 / ⁇ 3 X ⁇ m (preferably less than 1/2 X ⁇ m, more preferably at a point advanced from the one end toward the center by X ⁇ m starting from one end of the linearly extending portion. It is preferable to always satisfy that it is preferably less than 1/3 X ⁇ m, for example, less than 1/4 X ⁇ m.
- the second surface of the linearly extending portion has a cross section perpendicular to the longitudinal direction of the linearly extending portion, from one end of the linearly extending portion.
- An inclined portion extending in the depth direction of the pressure-sensitive adhesive layer, and a flat portion including the deepest portion of the linearly extending portion and substantially parallel to the adhesive surface.
- the inclined portion is curved convexly toward the pressure-sensitive adhesive layer.
- the linearly extending portion has a ratio of width W to thickness T (W / T) of 50 or more.
- the effects of the present invention can be more preferably exhibited with respect to such a configuration.
- the width of the linearly extending portion is 100 ⁇ m or more.
- the effects of the present invention can be more preferably exhibited with respect to such a configuration.
- a pressure-sensitive adhesive sheet with a release liner comprising any of the pressure-sensitive adhesive sheets disclosed herein and a release liner that protects the adhesive surface of the pressure-sensitive adhesive sheet.
- the surface of the release liner the surface on the adhesive surface side is preferably formed smoothly.
- a release liner for pressure-sensitive adhesive sheets comprising a peelable support having at least one surface that is a peelable surface.
- a coat layer that can be transferred to an adhesive sheet is provided on the peelable surface of the peelable support.
- the coat layer has a portion extending linearly from one end to the other end of the peelable surface.
- the linearly extending portion has a first surface located on the peelable surface side and a second surface constituting an outer surface on the peelable surface.
- the second surface of the linearly extending portion is configured by a gentle curve as a whole in a cross section perpendicular to the longitudinal direction of the linearly extending portion.
- FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is typical sectional drawing which expands and shows the cross section (cross section orthogonal to a longitudinal direction) of the part extended linearly of the coat layer which concerns on one Embodiment.
- FIG. 4 is a schematic cross-sectional view further enlarging a left end portion of the coat layer in FIG. 3. It is typical sectional drawing which expands and shows the right end part of the coating layer of FIG. 3 further. It is sectional drawing which shows typically the adhesive sheet with a peeling liner which concerns on one Embodiment.
- the concept of the pressure-sensitive adhesive sheet in this specification includes what can be called pressure-sensitive adhesive tapes, pressure-sensitive adhesive labels, pressure-sensitive adhesive films, and the like.
- the pressure-sensitive adhesive sheet disclosed herein may be in the form of a roll or a single sheet. Or the sheet
- FIG. 1 is a top view schematically showing an adhesive sheet according to an embodiment
- FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
- the pressure-sensitive adhesive sheet of this embodiment will be described with reference to the drawings.
- the pressure-sensitive adhesive sheet 1 has a laminated structure of a film-like base material 10 and a pressure-sensitive adhesive layer 20.
- the film-like substrate 10 supports the pressure-sensitive adhesive layer 20.
- a surface 20A on the pressure-sensitive adhesive layer 20 side constitutes an adhesive surface 1A.
- the other surface (surface on the film-like base material 10 side) 1B of the pressure-sensitive adhesive sheet 1 is a non-adhesive surface.
- the coat layer 30 is partially disposed on the surface 20A of the pressure-sensitive adhesive layer 20.
- the pressure-sensitive adhesive layer surface 20 ⁇ / b> A is partially covered by the coat layer 30.
- the coat layer 30 serves as a passage through which air or the like passes between the pressure-sensitive adhesive sheet 1 and the adherend when the pressure-sensitive adhesive sheet 1 is bonded to the adherend, and imparts air release properties.
- the coat layer 30 presents a predetermined pattern (coat layer pattern) 40 on the adhesive surface 1A of the pressure-sensitive adhesive sheet 1.
- the coat layer 30 has a lattice pattern 40.
- the grid pattern 40 of the coat layer 30 is a first stripe pattern portion 42 and a second stripe arranged to intersect the first stripe pattern portion 42 on the adhesive surface 1A of the pressure-sensitive adhesive sheet 1. Pattern portion 44.
- the first stripe pattern portion 42 is composed of a plurality of portions (portions extending linearly, in the present embodiment, strip-like portions) 50 extending linearly from one end of the bonding surface 1A to the other end.
- the linearly extending portions 50 are arranged in parallel at intervals in the width direction.
- the linearly extending portions 50 are arranged at angles at which the longitudinal direction intersects the end portions in the width direction of the pressure-sensitive adhesive sheet 1 and reach the both ends of the adhesive surface 1A, respectively.
- the second stripe pattern portion 44 also includes a plurality of portions (linearly extending portions.
- a strip shape) extending linearly from one end to the other end of the bonding surface 1 ⁇ / b> A.
- Part 50, and the plurality of linearly extending parts 50 are arranged in parallel in the width direction at intervals.
- the linearly extending portions 50 are arranged at angles at which the longitudinal direction intersects the end portions in the width direction of the pressure-sensitive adhesive sheet 1 and reach the both ends of the adhesive surface 1A, respectively.
- the linearly extending portion 50 is a straight belt-like portion, but is not limited to this, and each linearly extending portion may extend in a curved shape.
- a stripe pattern that can be formed by a plurality of linearly extending portions may be wavy.
- the number of the part extended linearly can be determined by the relationship with the shape, size, etc. of the adhesive surface of an adhesive sheet, it is not restrict
- first stripe pattern portion 42 and the second stripe pattern portion 44 are the linear extension portion 50 of the first stripe pattern portion 42 and the linear shape of the second stripe pattern portion 44. And the portion 50 extending in a crossing direction so as to be substantially orthogonal. Accordingly, the linearly extending portion 50 of the first stripe pattern portion 42 and the linearly extending portion 50 of the second stripe pattern portion 44 partially overlap each other.
- the lattice pattern typically refers to a pattern including two stripe pattern portions intersecting each other, and not only an orthorhombic lattice as in the present embodiment, but also a square lattice and a triangular lattice. And various other lattice shapes.
- the crossing angle (acute angle side) of the two striped pattern portions is 10 to 90 degrees (preferably 45 to 90 degrees, typically 60 to 90 degrees). It can be set within the range.
- the lattice pattern disclosed herein includes a pattern including a stripe-shaped pattern portion composed of a plurality of linearly extending portions that repeatedly bend, for example, a pattern such as a hexagonal lattice.
- Such a pattern may be a pattern in which adjacent linearly extending portions are partially connected.
- the coat layer preferably has one or more stripe-shaped pattern portions.
- the coat layer pattern (typically a lattice pattern) may have a third stripe pattern portion.
- FIG. 3 is a schematic cross-sectional view showing an enlarged cross-section (cross-section perpendicular to the longitudinal direction) of the linearly extending portion of the coat layer according to one embodiment
- FIG. 4 is a left end of the coat layer of FIG.
- FIG. 5 is a schematic cross-sectional view further enlarging the right end portion of the coat layer of FIG. 3.
- the linearly extending portion 50 of the coat layer 30 is a thin layer partially laminated on the surface 20 ⁇ / b> A of the pressure-sensitive adhesive layer 20, and is a first layer constituting the adhesive surface 1 ⁇ / b> A of the pressure-sensitive adhesive sheet 1. It has the surface 52 and the 2nd surface 54 located in the adhesive layer 20 side with respect to the 1st surface 52.
- the surface of the linearly extending portion 50 includes a first surface (outer surface) 52 and a second surface (inner surface) 54 that is the opposite surface of the first surface 52.
- the first surface 52 of the linearly extending portion 50 is flush with the outer surface of the pressure-sensitive adhesive layer 20 or slightly raised from the outer surface of the pressure-sensitive adhesive layer 20. From the viewpoint of air release, the first surface 52 of the linearly extending portion 50 is preferably slightly raised from the outer surface of the pressure-sensitive adhesive layer 20.
- the raised height of the first surface of the linearly extending portion is the thickness of the linearly extending portion. It is preferably less than 30% (for example, less than 10%). Note that the thickness of the linearly extending portion is basically the same as the thickness of the coat layer.
- the second surface 54 of the linearly extending portion 50 has a gentle curve as a whole in a cross section orthogonal to the longitudinal direction of the linearly extending portion 50. Specifically, as shown in FIG. 4, the second surface 54 of the linearly extending portion 50 increases from the one end (left end in the drawing) 56 of the linearly extending portion 50 toward the center in the cross section. It has a portion that extends in a gentle curve in the depth direction of the pressure-sensitive adhesive layer 20 (the thickness direction of the pressure-sensitive adhesive layer 20). Similarly, as illustrated in FIG. 5, the second surface 54 of the linearly extending portion 50 has a second end 54 (right end in the drawing) 58 of the linearly extending portion 50 as a starting point toward the center in the cross section.
- the one end 56 and the other end 58 are one end and the other end in the width direction of the linearly extending portion 50, respectively.
- the second surface 54 of the linearly extending portion 50 includes an inclined portion 60 and a flat portion 62 that continues from the inclined portion 60.
- the inclined portion 60 has a shape extending in the depth direction of the pressure-sensitive adhesive layer 20 from one end 56 of the linearly extending portion 50 in the cross section.
- the flat part 62 of the said 2nd surface 54 is an area
- the inclined portion 60 has a width of about 10 ⁇ m from the one end 56 in the width direction of the linearly extending portion 50 to the center in the width direction and the width from the other end 58 in the width direction of the linearly extending portion 50. It is formed in an area of about 10 ⁇ m on the center side in the direction.
- the other region on the second surface 54 (which can be said to be the bottom of the coat layer 30) is a flat portion 62.
- the inclined portion 60 is convexly curved toward the pressure-sensitive adhesive layer 20 side.
- the region where the inclined portion is formed is not limited to the above, and the inclined portion has a width of the portion extending linearly when the depth of the deepest portion of the portion extending linearly of the coat layer is D ⁇ m. It may be formed in a region of 10 ⁇ D ⁇ m (typically 7 ⁇ D ⁇ m, for example, 4 ⁇ D ⁇ m) from one end or the other end in the direction to the center in the width direction. For example, when the depth of the deepest portion of the linearly extending portion of the coat layer is within the range of 0.5 to 2 ⁇ m, the inclined portion has a width from one end or the other end in the width direction of the linearly extending portion.
- the depth of the linearly extending portion is the depth of the second surface of the linearly extending portion, and the pressure-sensitive adhesive layer outer surface (strictly speaking, a virtual plane formed by the pressure-sensitive adhesive layer outer surface) The depth of the linearly extending portion with respect to is to be pointed out. The same applies to the depth of the deepest part.
- the inclined portion 60 extends from the one end 56 and the other end 58 in the width direction of the linearly extending portion 50 to a point at least about 1 ⁇ m (for example, 2 ⁇ m, typically 3 ⁇ m) in the center in the width direction.
- Inclination (specifically, the angle formed by the adhesive surface 1A and the inclined portion 60 in the cross section is, for example, an angle that can be recognized by a cross-sectional image (for example, SEM cross-sectional image) with a magnification of 10,000 times 5 degrees or more, typically 10 degrees or more).
- the degree of inclination of the inclined portion 60 is within a range in which the angle formed by the adhesive surface 1A and the inclined portion 60 in the cross section is approximately 60 degrees or less (for example, 45 degrees or less, typically 30 degrees or less). Is appropriate.
- the depth of the deepest portion of the linearly extending portion 50 of the coat layer 30 in this embodiment is about 1.5 ⁇ m, but the depth of the deepest portion is not limited to this.
- the depth of the deepest portion of the linearly extending portion of the coat layer is preferably about half or less (for example, 1/3 or less, typically 1/5 or less) of the thickness of the pressure-sensitive adhesive layer.
- the depth of the deepest part of the linearly extending portion of the coat layer is 0.1 ⁇ m or more (for example, 0.5 ⁇ m or more, typically 1 ⁇ m or more) from the viewpoint of air release. preferable.
- the depth of the deepest part is preferably 10 ⁇ m or less, more preferably 5 ⁇ m or less (for example, 3 ⁇ m or less, typically 2 ⁇ m or less).
- the depth of the deepest portion of the coat layer that extends linearly is substantially the same as the thickness of the coat layer.
- the depth of the deepest part of the part extended linearly of a coat layer can be grasped
- the width (W1) of each linearly extending portion 50 of the coat layer 30 is approximately 200 ⁇ m in the present embodiment, but is not limited thereto. In a preferred embodiment, the width (W1) of each linearly extending portion of the coat layer is set within a range of 0.1 to 2 mm. Thereby, it is possible to achieve both high adhesive strength with time and good air escape.
- the width (W1) of the linearly extending portion is more preferably 0.2 mm or more, still more preferably 0.3 mm or more, and particularly preferably 0.5 mm or more, from the viewpoint of improving the air escape property. In another preferred embodiment, the width (W1) of each linearly extending portion of the coat layer is about 10 ⁇ m or more.
- the width (W1) of each linearly extending portion of the coat layer is preferably 50 ⁇ m or more, more preferably 100 ⁇ m or more, and even more preferably 150 ⁇ m or more.
- the width (W1) of the linearly extending portion is more preferably 1.2 mm or less, further preferably 1.0 mm or less, particularly preferably 0.7 mm or less, Especially preferably, it is 0.5 mm or less, Most preferably, it is 0.4 mm or less.
- the width (W1) of the linearly extending portion of the first stripe pattern portion and the width (W1) of the linearly extending portion of the second stripe pattern portion may be the same or different. Good.
- the linearly extending portion has a ratio of the width W to the thickness T (W / T) of about 50 or more.
- the ratio (W / T) is more preferably about 80 or more, and further preferably 100 or more (typically 120 or more).
- the ratio (W / T) is preferably about 500 or less (for example, 200 or less, typically 165 or less).
- the interval (W2) between the linearly extending portions 50 constituting the first stripe pattern portion 42 of the coat layer 30 is about 1.8 mm in the present embodiment, and the linear stripe portion constituting the second stripe pattern portion 44 is formed.
- the interval (W2) between the portions 50 extending in the same manner is the same, but is not limited thereto.
- the interval (W2) between the linearly extending portions constituting the first stripe pattern portion is preferably set within a range of 1.0 to 10 mm. Thereby, the tendency for high adhesive force with time and air-release property to be balanced is enhanced.
- the interval (W2) between the linearly extending portions refers to the width of the portion existing between two adjacent linearly extending portions on the adhesive surface of the pressure-sensitive adhesive sheet.
- the distance (W2) between the linearly extending portions is more preferably 1.5 mm or more, and still more preferably 2.5 mm or more, from the viewpoint of improving adhesive strength with time.
- the interval (W2) between the linearly extending portions may be about 8 mm or less (for example, 5 mm or less, typically 3 mm or less).
- the interval (W2) between the linearly extending portions constituting the second stripe pattern portion is also preferably set from the range exemplified as the interval (W2) between the linearly extending portions constituting the first stripe pattern portion.
- the interval (W2) is preferably an equal interval.
- the interval (W2) between the linearly extending portions constituting the first stripe pattern portion and the interval (W2) between the linearly extending portions constituting the second stripe pattern portion may be the same, May be different.
- the pitch of the linearly extending portions is preferably in the range of 1 to 20 mm from the viewpoint of achieving a balance between high adhesive strength with time and air release.
- the pitch of the linearly extending portion is more preferably 1.5 mm or more, further preferably 2 mm or more (for example, 2.5 mm or more), more preferably 15 mm or less (for example, 12 mm or less), and further preferably 5 mm. It is as follows.
- the said pitch shall point out the distance (space
- the surface 20A of the pressure-sensitive adhesive layer 20 when attention is paid to the surface 20A of the pressure-sensitive adhesive layer 20, the surface 20A of the pressure-sensitive adhesive layer 20 is not provided with the coat layer arrangement portion 70 in which the coat layer 30 is arranged and the coat layer 30. It can be expressed that the adhesive layer 20 has the coating layer non-arranged portion 72 exposed on the outer surface.
- the configuration (shape, arrangement state, arrangement relationship, size, etc.) of the coat layer arrangement portion 70 on the pressure-sensitive adhesive layer surface 20 ⁇ / b> A is the same as that of the coat layer 30 on the adhesive surface 1 ⁇ / b> A of the pressure-sensitive adhesive sheet 1.
- the coat layer arrangement portion 70 has a pattern (lattice pattern) having the same configuration as the coat layer pattern 40, a first stripe pattern portion having the same configuration as the first stripe pattern portion 42, and a second The second stripe pattern portion having the same configuration as the stripe pattern portion 44 is provided. Further, the first stripe pattern portion of the coat layer arrangement portion 70 has a linearly extending portion having the same configuration as the linearly extending portion 50 of the first stripe pattern portion 42. The second stripe pattern portion has a linearly extending portion having the same configuration as the linearly extending portion 50 included in the second stripe pattern portion 44 of the coat layer 30. Therefore, the description regarding the structure of the coat layer arrangement
- the pressure-sensitive adhesive sheet 1 can be in the form of a pressure-sensitive adhesive sheet 1 with a release liner having a configuration protected by a release liner 100 having a release surface on the adhesive surface 1A side, as shown in FIG.
- the back surface of the film-like substrate 10 (the surface opposite to the surface on the pressure-sensitive adhesive layer 20 side) is a release surface, and the pressure-sensitive adhesive layer 20 is formed on the back surface by winding the pressure-sensitive adhesive sheet 1.
- abutted and the adhesive layer 20 was protected by the back surface of the film-form base material 10 may be sufficient.
- the pressure-sensitive adhesive sheet disclosed here is a double-sided adhesive type pressure-sensitive adhesive sheet with a base material (double-sided pressure-sensitive adhesive sheet) shown in FIG. Non-peelable) are provided with pressure-sensitive adhesive layers 21 and 22, respectively, and the pressure-sensitive adhesive layers 21 and 22 are protected by release liners 101 and 102, at least the pressure-sensitive adhesive layer side being a release surface, respectively. It may have.
- the coat layer 30 is partially disposed only on the surface of the pressure-sensitive adhesive layer 21, and no coat layer is provided on the surface of the pressure-sensitive adhesive layer 22.
- the double-sided pressure-sensitive adhesive sheet is provided with a pressure-sensitive adhesive layer on each surface of the film-like substrate (both are non-peelable), and one of the pressure-sensitive adhesive layers has both surfaces separated from each other. You may have the structure protected by the release liner which has become.
- This type of pressure-sensitive adhesive sheet has a configuration in which two pressure-sensitive adhesive layers are protected by one release liner by winding the pressure-sensitive adhesive sheet and bringing the other pressure-sensitive adhesive layer into contact with the back surface of the release liner.
- the double-sided pressure-sensitive adhesive sheet is preferably used, for example, for joining and fixing.
- the area ratio of the coating layer non-arranged portion on the pressure-sensitive adhesive layer surface (which may be the area ratio of the coating layer on the adhesive surface of the pressure-sensitive adhesive sheet) is preferably 70% or more. Thereby, high adhesive strength with time can be ensured.
- the area ratio is more preferably 75% or more, and still more preferably 80% or more. From the viewpoint of obtaining good air escape properties, the area ratio is preferably 90% or less, more preferably 85% or less.
- the adhesive surface of the pressure-sensitive adhesive sheet (typically composed of the outer surface of the pressure-sensitive adhesive layer and the surface of the coat layer) has a 180-degree peel strength (hereinafter referred to as “24” after 24 hours of 13 N / 25 mm or more). Also referred to as “adhesive strength after time”). According to the pressure-sensitive adhesive sheet, it is possible to exert a predetermined time-dependent adhesive force while having good air detachability.
- the adhesive strength after 24 hours is preferably 14 N / 25 mm or more (for example, 16 N / 25 mm or more).
- the adhesive surface of the pressure-sensitive adhesive sheet exhibits an adhesive force after 24 hours of 2 N / 20 mm or more (preferably 5 N / 20 mm or more, more preferably 8 N / 20 mm or more).
- the adhesive strength after the lapse of 24 hours may be measured by the following method. Specifically, for a measurement sample obtained by cutting an adhesive sheet into a size of 20 mm or 25 mm in width and 100 mm in length, the adhesion surface of the measurement sample is a stainless steel plate (SUS304BA plate) in an environment of 23 ° C. and 50% RH. A 2 kg roller is reciprocated once on the surface of the tape and pressed.
- the pressure-sensitive adhesive sheet is a transparent (including translucent) pressure-sensitive adhesive sheet.
- a transparent (including translucent) pressure-sensitive adhesive sheet when bubbles or the like are mixed between the pressure-sensitive adhesive sheet and the adherend, the bubbles and the like are visually recognized through the pressure-sensitive adhesive sheet, and the appearance is easily impaired. According to the technology disclosed herein, generation of bubbles or the like between the pressure-sensitive adhesive sheet and the adherend is prevented, so that an excellent appearance can be obtained in a pressure-sensitive adhesive sheet having transparency.
- an adhesive sheet is transparent means that the component (an adhesive layer, a film-form base material, and a coating layer) of an adhesive sheet is transparent.
- the pressure-sensitive adhesive sheet and its constituent elements are transparent that the pressure-sensitive adhesive sheet and its constituent elements exhibit a total light transmittance of 50% or more.
- the total light transmittance may be 80% or more (for example, 90% or more, typically 95% or more).
- the haze value of an adhesive sheet is 10% or less (for example, 5% or less).
- the total light transmittance and haze value are measured using a commercially available transmissometer (for example, trade name “HAZEMETER HM-150”, manufactured by Murakami Color Research Laboratory Co., Ltd.) in accordance with JIS K 7136: 2000. do it.
- the total light transmittance and haze value of a film-like substrate described later are also measured by the same method.
- the total thickness of the pressure-sensitive adhesive sheet (including the pressure-sensitive adhesive layer and the base material but not including the release liner) disclosed herein is not particularly limited, and is suitably in the range of about 2 to 1000 ⁇ m.
- the thickness is preferably 5 to 500 ⁇ m (for example, 10 to 300 ⁇ m, typically 30 to 100 ⁇ m).
- the total thickness of the pressure-sensitive adhesive sheet is 50 ⁇ m or less, more preferably 30 ⁇ m or less (for example, 15 ⁇ m or less, typically 5 ⁇ m or less). According to the technique disclosed herein, even if the pressure-sensitive adhesive sheet has a limited total thickness as described above, good air escape characteristics can be obtained.
- the pressure-sensitive adhesive sheet having a limited total thickness can be advantageous in terms of reducing the size, weight, and resource saving of the product to which the pressure-sensitive adhesive sheet is applied.
- the thickness tolerance of the pressure-sensitive adhesive sheet disclosed herein is preferably 50% or less. According to the pressure-sensitive adhesive sheet having a small thickness tolerance, more excellent pressure-sensitive adhesive properties can be exhibited.
- the thickness tolerance is more preferably 40% or less, further preferably 30% or less, and particularly preferably 20% or less.
- the thickness tolerance of the pressure-sensitive adhesive sheet is measured by the method described in Examples described later.
- a resin film, paper, cloth, rubber film, foam film, metal foil, a composite or laminate of these, and the like can be used.
- a resin film layer is included from a viewpoint of sticking property or an external appearance property.
- the inclusion of the resin film layer is advantageous from the viewpoint of dimensional stability, thickness accuracy, workability, tensile strength, and the like.
- resin films examples include polyolefin resin films such as polyethylene (PE), polypropylene (PP), and ethylene / propylene copolymers; polyester resin films such as polyethylene terephthalate (PET), polybutylene terephthalate, and polyethylene naphthalate; Vinyl chloride resin film; vinyl acetate resin film; polyimide resin film; polyamide resin film; fluorine resin film; cellophane; Preferable examples include resin films formed from PE, PP, and PET. Among the resin films, a polyester film is more preferable, and a PET film is more preferable among them.
- the film-like substrate may have a single layer structure or may have a multilayer structure of two layers or three or more layers.
- the film-like base material is a base material (foam-containing base material) provided with a foam film.
- the foam film refers to a film-like structure provided with a portion having bubbles (bubble structure).
- the foam-containing base material may be a single-layer structure composed of a foam film, or a multilayer in which at least one of two or more multilayer structures is composed of a foam film (foam layer). It may be a structure.
- a foam containing base material the composite base material with which the foam film (foam layer) and the non-foam film (non-foam layer) were laminated
- Non-foamed film refers to a film-like structure that has not undergone intentional treatment (for example, bubble introduction treatment) to make a foam, and a film that does not substantially have a bubble structure.
- a typical example of a non-foam film is a resin film (for example, a polyester-based resin film such as PET) having an expansion ratio of less than 1.1 times (for example, less than 1.05 times, typically less than 1.01 times).
- the film-like substrate includes two or more foam layers, the materials and structures of these foam layers may be the same or different.
- the contact bonding layer may be arrange
- the average cell diameter of the foam film is not particularly limited, but is usually suitably 10 ⁇ m to 200 ⁇ m, preferably 20 ⁇ m to 180 ⁇ m, and more preferably 30 ⁇ m to 150 ⁇ m.
- the average cell diameter is 10 ⁇ m or more, the impact absorbability tends to be improved.
- the average cell diameter is 200 ⁇ m or less, the handleability and waterproofness (water-stopping property) tend to be improved.
- the average cell diameter ( ⁇ m) of the foam film can be determined by taking an enlarged image of the foam cross section and analyzing the image using a commercially available low vacuum scanning electron microscope.
- the number of bubbles to be analyzed may be about 10-20.
- As the low vacuum scanning electron microscope for example, a trade name “S-3400N scanning electron microscope” manufactured by Hitachi High-Tech Science Systems, Inc. can be used.
- the density (apparent density) of the foam film is not particularly limited, but is usually suitably 0.01 g / cm 3 or more, preferably 0.01 to 0.7 g / cm 3 , Preferably, it is 0.02 to 0.5 g / cm 3 .
- the density is not particularly limited, but is usually suitably 0.01 g / cm 3 or more, preferably 0.01 to 0.7 g / cm 3 , Preferably, it is 0.02 to 0.5 g / cm 3 .
- the density (apparent density) of the foam film is measured according to the method described in JIS K 7222: 1999. Specifically, a foam film is punched into a size of 100 mm ⁇ 100 mm to prepare a sample, and the dimension of the sample is measured. Further, the thickness of the sample is measured using a 1/100 dial gauge having a measurement terminal diameter of 20 mm. The volume of the foam film sample is calculated from these values. Further, the weight of the sample is measured with an upper pan balance having a minimum scale of 0.01 g or more. From these values, the apparent density (g / cm 3 ) of the foam film can be determined.
- the 50% compressive load of the foam film is not particularly limited. From the viewpoint of impact resistance, it is appropriate that the foam film exhibits a 50% compressive load of 0.1 N / cm 2 or more. When the 50% compression load is equal to or greater than the predetermined value, for example, even when the foam film is thin (for example, about 100 ⁇ m thick), sufficient resistance when compressed (to push back when compressed) Force), and good impact resistance can be maintained.
- the 50% compressive load is preferably 0.2 N / cm 2 or more, more preferably 0.5 N / cm 2 or more.
- the 50% compression load is suitably 8 N / cm 2 or less, preferably 6 N / cm 2 or less, more preferably 3 N / cm 2 or less.
- the 50% compression load (hardness) of the foam film is measured according to JIS K 6767: 1999. Specifically, the foam film is cut out to 100 mm ⁇ 100 mm, laminated so that the total thickness is 2 mm or more, and this is used as a measurement sample. When the sample was compressed at a speed of 10 mm / min using a compression tester at room temperature, and the compression rate reached 50% (compressed to 50% of the initial thickness) The value after 10 seconds holding (repulsive stress: N / cm 2 ) is recorded as a 50% compression load. About other conditions (for example, a jig
- the cell structure of the foam constituting the foam film disclosed herein is not particularly limited.
- the cell structure may be any of an open cell structure, a closed cell structure, and a semi-continuous semi-closed cell structure. From the viewpoint of impact absorption, an open cell structure and a semi-open semi-closed cell structure are preferable.
- the material of the foam film is not particularly limited.
- the foam film can be formed from a material that typically includes a polymer component (eg, a thermoplastic polymer).
- a foam film formed of a foam of a plastic material (plastic foam) is preferable.
- the plastic material for forming the plastic foam (meaning including rubber material) is not particularly limited, and can be appropriately selected from known plastic materials.
- Plastic materials typically thermoplastic polymers
- the main component of the polymer component contained in the film-like substrate or the foam film may be hereinafter referred to as “base polymer”.
- foams include polyolefin resin foams such as PE foams and PP foams; polyester resin foams such as PET foams, polyethylene naphthalate foams, polybutylene terephthalate foams, etc. Body; Polyvinyl chloride resin foam such as polyvinyl chloride foam; Vinyl acetate resin foam; Acrylic resin foam; Polyphenylene sulfide resin foam; Polyamide (nylon) resin foam; Amide resin foams such as wholly aromatic polyamide (aramid) resin foams; Polyimide resin foams; Polyetheretherketone (PEEK) foams; Polystyrene ether foams such as polystyrene foams And urethane resin foams such as polyurethane resin foam; and the like. Further, as the foam, a rubber-based resin foam such as a polychloroprene rubber foam may be used.
- a rubber-based resin foam such as a polychloroprene rubber foam may be used as a polychloroprene
- an acrylic resin foam (acrylic resin foam) is used as the foam.
- the acrylic resin foam refers to a foam containing an acrylic polymer as a base polymer.
- the definition of the acrylic polymer in the present specification is as described below.
- the alkyl (meth) acrylate constituting the acrylic polymer is one kind of alkyl (meth) acrylate having a chain alkyl group having 1 to 20 carbon atoms (preferably 1 to 8, typically 1 to 4). Or 2 or more types are used preferably.
- Preferable examples of the alkyl (meth) acrylate include ethyl acrylate, n-butyl acrylate and 2-ethylhexyl acrylate.
- the amount of the alkyl (meth) acrylate as the main monomer is suitably 70% by weight or more, preferably 75% by weight or more (for example, 80% by weight or more) in the total monomer components of the acrylic polymer.
- the amount of the alkyl (meth) acrylate is suitably 98% by weight or less, preferably 97% by weight or less (for example, 96% by weight or less) in all monomer components.
- the secondary monomer copolymerizable with the main monomer, alkyl (meth) acrylate can be useful for introducing a crosslinking point into the acrylic polymer or increasing the cohesive strength of the acrylic polymer.
- a secondary monomer for example, a carboxy group-containing monomer, a hydroxyl group-containing monomer, an acid anhydride group-containing monomer, an amide group-containing monomer, an amino group-containing monomer, a cyano group-containing monomer, a functional group-containing monomer such as a monomer having a nitrogen atom-containing ring 1 type (s) or 2 or more types can be used.
- the secondary monomer may also be a vinyl ester monomer such as vinyl acetate, an aromatic vinyl compound such as styrene, a sulfonic acid group-containing monomer, a phosphoric acid group-containing monomer, and the like.
- the amount of the submonomer is suitably 0.5% by weight or more, preferably 1% by weight or more in the total monomer component of the acrylic polymer.
- the amount of the submonomer is suitably 30% by weight or less, preferably 10% by weight or less, based on all monomer components.
- the monomer component constituting the acrylic polymer is used as a sub-monomer. It is preferable that a nitrogen atom-containing monomer is contained. As a result, bubbles are likely to be generated during foaming, and when the foam is formed (typically, when the resin composition is dried), the viscosity of the composition increases and the bubbles are retained in the foam. The effect of being easy can be exhibited.
- nitrogen atom-containing monomer examples include cyano group-containing monomers such as acrylonitrile and methacrylonitrile; lactam ring-containing monomers such as N-vinyl-2-pyrrolidone; (meth) acrylamide, N-hydroxyethyl (meth) acrylamide, Amide group-containing monomers such as N-methylolacrylamide, N, N-dimethylacrylamide, N, N-diethylacrylamide, and diacetoneacrylamide; These can be used alone or in combination of two or more. Of these, cyano group-containing monomers such as acrylonitrile and lactam ring-containing monomers such as N-vinyl-2-pyrrolidone are preferred.
- the amount of the nitrogen atom-containing monomer is suitably 2% by weight or more, preferably 3% by weight or more (for example, 4% by weight or more) in the total monomer components of the acrylic polymer.
- the amount of the nitrogen atom-containing monomer is suitably 30% by weight or less, preferably 25% by weight or less (for example, 20% by weight or less) in all monomer components.
- the method for obtaining the acrylic polymer is not particularly limited.
- a method for synthesizing the acrylic polymer such as solution polymerization method, emulsion polymerization method, bulk polymerization method, suspension polymerization method, active energy ray polymerization method (for example, UV polymerization method).
- Various known polymerization methods can be appropriately employed.
- a monomer mixture is dissolved or dispersed in a suitable polymerization solvent (toluene, ethyl acetate, water, etc.), and a polymerization operation is performed using a polymerization initiator such as an azo polymerization initiator or a peroxide initiator.
- a desired acrylic polymer can be obtained.
- An acrylic resin foam (emulsion-type acrylic resin foam) obtained by an emulsion polymerization method is preferably used in terms of foamability and environmental aspects.
- the acrylic resin foam-forming composition preferably contains a cross-linking agent from the viewpoint of increasing the cohesive strength.
- the type of the crosslinking agent is not particularly limited, and one or more of various crosslinking agents can be appropriately selected and used.
- the crosslinking agent include an isocyanate crosslinking agent, an epoxy crosslinking agent, an oxazoline crosslinking agent, a carbodiimide crosslinking agent, a melamine crosslinking agent, and a metal oxide crosslinking agent. Of these, oxazoline-based crosslinking agents are preferred.
- the amount of the crosslinking agent used is not particularly limited, and is from about 10 parts by weight or less (for example, about 0.005 to 10 parts by weight, preferably about 0.01 to 5 parts by weight) with respect to 100 parts by weight of the acrylic polymer. It is appropriate to select.
- a polyolefin resin foam (polyolefin resin foam) is used as the foam.
- plastic material constituting the polyolefin foam various known or commonly used polyolefin resins can be used without particular limitation.
- polyethylene such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), metallocene catalyst type linear low density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene- A vinyl acetate copolymer etc. are mentioned.
- LDPE low density polyethylene
- LLDPE linear low density polyethylene
- HDPE high density polyethylene
- metallocene catalyst type linear low density polyethylene polypropylene
- ethylene-propylene copolymer ethylene- A vinyl acetate copolymer etc.
- Such polyolefin resin can be used individually by 1 type or in combination of 2 or more types as appropriate.
- a polyethylene foam film substantially composed of a polyethylene resin foam examples thereof include a polypropylene-based foam film substantially composed of a foam.
- the polyethylene-based resin refers to a resin having ethylene as a main monomer (that is, a main component of the monomer), and other than HDPE, LDPE, LLDPE, etc., the ethylene copolymerization ratio exceeds 50% by weight.
- -Propylene copolymer, ethylene-vinyl acetate copolymer, etc. may be included.
- a polypropylene resin refers to a resin having propylene as a main monomer.
- a polypropylene-based foam film can be preferably employed.
- the foaming method of the foam film is not particularly limited, and methods such as a chemical method and a physical method can be used alone or in combination depending on the purpose and operability.
- a physical foaming method is preferable from the viewpoint of contamination and the like.
- a foaming method in which a low-boiling compound such as hydrocarbon or a foaming agent such as thermal expansion microspheres is contained in the film-forming material, and bubbles are formed from the foaming agent, a gas such as air mechanically And the like, a solvent removal foaming method using removal of a solvent such as water, a foaming method using a supercritical fluid, and the like.
- a method of forming a foam film by injecting an inert gas (for example, oxygen dioxide) into a polymer for forming a foam film under pressure and reducing the pressure can be preferably employed.
- an inert gas for example, oxygen dioxide
- the average cell diameter can be easily limited to a predetermined value or less, and the foam film can be easily reduced in density.
- a foam film is produced.
- the formation of the foam film is not particularly limited.
- a foaming method in which a gas such as air is mechanically mixed is employed, a resin composition containing bubbles (for example, an emulsion type resin composition) is then used.
- a foam film can be obtained by applying on a substrate or release paper and drying.
- the drying preferably includes a preliminary drying step of 50 ° C. or more and lower than 125 ° C. and a main drying step of 125 ° C. to 200 ° C. from the viewpoint of bubble stability and the like.
- a film-like foam may be continuously formed using a calendar, an extruder, a conveyor belt casting, or the like, and a method of foam-molding a kneaded product of the foam-forming material may be employed.
- the surface layer portion may be removed by slicing and adjusted to have a desired thickness and foam characteristics.
- the thermoplastic polymer that can be included in the foam film may include a thermoplastic elastomer that exhibits properties as a rubber at room temperature and exhibits thermoplasticity at a high temperature.
- a thermoplastic elastomer such as ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene-vinyl acetate copolymer, polybutene, polyisobutylene, chlorinated polyethylene; styrene -Styrene elastomers such as butadiene-styrene copolymers; thermoplastic polyester elastomers; thermoplastic polyurethane elastomers; thermoplastic acrylic elastomers; Among them, a thermoplastic elastomer having a glass transition temperature of room temperature or lower (for example, 20 ° C. or lower) is preferably used.
- foam film forming materials for example, emulsion type acrylic resin compositions
- foaming agents such as anionic surfactants and cationic surfactants.
- Various surfactants such as an agent, a nonionic surfactant, and an amphoteric surfactant can be used. Hydrocarbon or fluorine surfactants may be used.
- anionic surfactants are preferred from the viewpoint of finer bubble diameter and bubble stability, and fatty acid ammonium (typically higher fatty acid ammonium) surfactants such as ammonium stearate are more preferred.
- the said surfactant can be used individually by 1 type or in combination of 2 or more types.
- the surfactant content is preferably about 0.1 to 10 parts by weight (eg 0.5 to 8 parts by weight) with respect to 100 parts by weight of the base polymer of the foam film.
- the foaming agent in this specification includes not only an agent exhibiting a foaming action but also a bubble stabilizer such as a bubble diameter adjusting agent for reducing the bubble diameter and a foam stabilizer.
- the foam film-forming material is an aqueous dispersion (for example, an acrylic emulsion)
- a silicone compound as the foaming agent.
- the silicone compound a silicone compound having a siloxane bond of 2000 or less is preferable.
- the silicone compound include silicone oil, modified silicone oil, and silicone resin. Of these, dimethyl silicone oil and methylphenyl silicone oil are preferable.
- a silicone-modified polymer for example, silicone-modified acrylic polymer, silicone-modified urethane polymer, etc.
- the content of the silicone compound is 0.01 to 5 parts by weight (eg 0.05 to 4 parts by weight, typically 0.1 to 3 parts by weight) with respect to 100 parts by weight of the base polymer of the foam film. It is preferable to set the degree.
- the foam film-forming material may contain a thickener.
- the thickener is not particularly limited, and examples thereof include an acrylic acid thickener, a urethane thickener, and a polyvinyl alcohol thickener. Of these, polyacrylic acid thickeners and urethane thickeners are preferred.
- the content of the thickener is preferably about 0.1 to 10 parts by weight (for example, 0.1 to 5 parts by weight) with respect to 100 parts by weight of the base polymer of the foam film.
- the foam film When a foam-containing substrate is used as the film-like substrate, the foam film preferably contains a cell nucleating agent such as a metal hydroxide (for example, magnesium hydroxide).
- a cell nucleating agent such as a metal hydroxide (for example, magnesium hydroxide).
- the cell nucleating agent may be a metal oxide, composite oxide, metal carbonate, metal sulfate or the like.
- the content of the cell nucleating agent is preferably about 0.5 to 125 parts by weight (for example, 1 to 120 parts by weight) with respect to 100 parts by weight of the base polymer of the foam film.
- the foam film contains a gas permeation inhibitor such as fatty acid amide from the viewpoint of suppressing the permeation of gas components from the foam during the formation of bubbles. It is preferable.
- the fatty acid amide is more preferably one having a bisamide structure.
- the gas permeation inhibitor may be a fatty acid metal salt.
- the content of the gas permeation inhibitor is about 0.5 to 10 parts by weight (for example, 0.7 to 8 parts by weight, typically 1 to 6 parts by weight) with respect to 100 parts by weight of the base polymer of the foam film. It is preferable to do.
- the film-like substrate may contain a softening agent for the purpose of imparting desired fluidity to the film-forming material and improving properties such as flexibility.
- a softening agent for the purpose of imparting desired fluidity to the film-forming material and improving properties such as flexibility.
- properties such as film stretchability and expansion ratio can be preferably adjusted.
- hydrocarbon softeners such as liquid paraffin, paraffin wax, microwax and polyethylene wax, ester softeners such as stearic acid monoglyceride, and fatty acid softeners can be preferably used. .
- the content of the softening agent is 0.5 to 50 parts by weight (for example, 0.8 to 40 parts by weight, typically 1 to 30 parts) with respect to 100 parts by weight of the base polymer of the film-like substrate (for example, foam film). Part by weight) is preferable.
- an arbitrary rust inhibitor may be included to prevent corrosion of the metal member adjacent to the foam film.
- an azole ring-containing compound is preferable.
- an azole ring-containing compound it is possible to achieve both high levels of metal corrosion prevention and adhesion to an adherend.
- compounds in which the azole ring forms a condensed ring with an aromatic ring such as a benzene ring are preferred, and benzotriazole compounds and benzothiazole compounds are particularly preferred.
- the content of the rust inhibitor is preferably about 0.2 to 5 parts by weight (for example, 0.3 to 2 parts by weight) with respect to 100 parts by weight of the base polymer of the foam film.
- the film-like substrate has transparency (including translucency).
- the pressure-sensitive adhesive sheet having such a film-like substrate when bubbles or the like are mixed between the pressure-sensitive adhesive sheet and the adherend, the bubbles are visually recognized through the pressure-sensitive adhesive sheet, and the appearance is easily impaired. According to the technique disclosed herein, generation of bubbles or the like between the pressure-sensitive adhesive sheet and the adherend is prevented, so that excellent appearance can be obtained in a configuration including a transparent substrate.
- the film-like substrate may exhibit a total light transmittance of 80% or more (for example, 90% or more, typically 95% or more).
- the haze value of a film-form base material is 10% or less (for example, 5% or less).
- the film-like substrate (for example, a resin film) may be colored black, white, or other colors by including various colorants (for example, pigments) in order to impart desired designability and optical characteristics. Carbon black is preferred as the black colorant.
- a filler inorganic filler, organic filler, etc.
- an anti-aging agent for example, an antioxidant, an ultraviolet absorber, as necessary.
- various additives such as an antistatic agent, a lubricant and a plasticizer may be further blended.
- the surface (back surface) opposite to the surface on which the pressure-sensitive adhesive layer is provided is formed smoothly among the surfaces of the film-like substrate.
- the smooth surface can be the outer surface of the pressure-sensitive adhesive sheet, when the pressure-sensitive adhesive sheet having the smooth surface is used as, for example, a decorative sheet or a surface protective sheet, a better appearance (design) can be provided.
- the arithmetic average surface roughness on the back surface of the film-like substrate is 1 ⁇ m or less (for example, about 0.05 to 0.75 ⁇ m, typically about 0 from the viewpoint of adhesive properties and appearance (design). .1 to 0.5 ⁇ m).
- the arithmetic average surface roughness is measured using a general surface roughness measuring device (for example, a non-contact three-dimensional surface shape measuring device manufactured by Veeco, model “Wyko NT-3300”). be able to.
- the back surface of the film-like substrate (the side opposite to the surface on which the adhesive layer is provided)
- the surface may be subjected to a release treatment with a release treatment agent such as a silicone-based, long-chain alkyl-based, or fluorine-based material, if necessary.
- a release treatment agent such as a silicone-based, long-chain alkyl-based, or fluorine-based material
- the surface of the film-like base material on the pressure-sensitive adhesive layer side is subjected to a conventionally known surface treatment such as corona discharge treatment or application of a primer for the purpose of improving the adhesion between the base material and the pressure-sensitive adhesive layer. It may be given.
- the thickness of the film-like substrate is not particularly limited and can be appropriately selected depending on the purpose. In general, the thickness is usually 1 ⁇ m or more (for example, about 2 to 500 ⁇ m), and 5 to 500 ⁇ m (for example, 10 to 200 ⁇ m, typically 15 to 100 ⁇ m). Is preferred. In a preferred embodiment, the thickness of the film-like substrate is about 30 ⁇ m or less, more preferably 12 ⁇ m or less, and even more preferably less than 10 ⁇ m (for example, less than 5 ⁇ m, typically less than 3 ⁇ m). Limiting the thickness of the film-like substrate is advantageous in terms of reducing the thickness, reducing the size, reducing the weight, and saving resources of the pressure-sensitive adhesive sheet.
- the thickness of the foam-containing substrate (for example, the foam film substrate) can be appropriately set according to the strength, flexibility, purpose of use, etc. of the pressure-sensitive adhesive sheet. . From the viewpoint of impact absorption and the like, it is appropriate that the thickness of the foam-containing substrate is 30 ⁇ m or more, preferably 50 ⁇ m or more, more preferably 60 ⁇ m or more (for example, 80 ⁇ m or more). From the viewpoint of reducing the thickness of the pressure-sensitive adhesive sheet, reducing the size, reducing the weight, saving resources, and the like, it is usually appropriate to set the thickness of the foam-containing substrate to 1 mm or less.
- the foam film disclosed herein By using the foam film disclosed herein, an excellent shock absorbing function can be exhibited even when the thickness is about 350 ⁇ m or less (more preferably 250 ⁇ m or less, for example, 180 ⁇ m or less).
- the thickness of the foam film (which may be a foam layer) in the foam-containing substrate can also be preferably selected from the range exemplified as the thickness of the above-mentioned foam-containing substrate.
- the pressure-sensitive adhesive layer disclosed herein typically exhibits a soft solid (viscoelastic body) state in a temperature range near room temperature, and is a material (pressure-sensitive adhesive) that has a property of easily adhering to an adherend by pressure. ).
- the adhesive here is generally complex elastic modulus E * (1 Hz) as defined in “C. A. Dahlquist,“ Adhesion: Fundamental and Practice ”, McLaren & Sons, (1966) P. 143”. ⁇ 10 ⁇ 7 > dyne / cm ⁇ 2 > material (typically a material having the above properties at 25 [deg.] C.).
- the pressure-sensitive adhesive layer disclosed herein is a known acrylic polymer, rubber polymer, polyester polymer, urethane polymer, polyether polymer, silicone polymer, polyamide polymer, fluorine polymer, etc. in the field of pressure sensitive adhesive. 1 type, or 2 types or more may be included as a base polymer. From the viewpoint of adhesive properties (for example, peel strength and repulsion resistance) and molecular design, an acrylic polymer can be preferably used. In other words, the pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive layer containing an acrylic polymer as a base polymer.
- the “base polymer” of the pressure-sensitive adhesive refers to the main component of the polymer component contained in the pressure-sensitive adhesive (typically a component included in an amount exceeding 50% by weight).
- the acrylic polymer for example, a polymer of a monomer raw material that includes alkyl (meth) acrylate as a main monomer and may further include a submonomer copolymerizable with the main monomer is preferable.
- the main monomer means a component occupying more than 50% by weight of the monomer composition in the monomer raw material.
- alkyl (meth) acrylate for example, a compound represented by the following formula (1) can be preferably used.
- CH 2 C (R 1 ) COOR 2 (1)
- R 1 in the above formula (1) is a hydrogen atom or a methyl group.
- R 2 is a chain alkyl group having 1 to 20 carbon atoms (hereinafter, such a range of the number of carbon atoms may be represented as “C 1-20 ”).
- an alkyl (meth) acrylate in which R 2 is a chain alkyl group of C 1-12 eg, C 2-10 , typically C 4-8 ) is preferable.
- alkyl (meth) acrylate in which R 2 is a C 1-20 chain alkyl group can be used singly or in combination of two or more.
- Preferred alkyl (meth) acrylates include n-butyl acrylate and 2-ethylhexyl acrylate.
- the secondary monomer copolymerizable with the main monomer, alkyl (meth) acrylate can be useful for introducing a crosslinking point into the acrylic polymer or increasing the cohesive strength of the acrylic polymer.
- a submonomer for example, one or two functional group-containing monomers such as a carboxy group-containing monomer, a hydroxyl group-containing monomer, an acid anhydride group-containing monomer, an amide group-containing monomer, an amino group-containing monomer, and a monomer having a nitrogen atom-containing ring The above can be used.
- the secondary monomer may also be a vinyl ester monomer such as vinyl acetate, an aromatic vinyl compound such as styrene, a sulfonic acid group-containing monomer, a phosphoric acid group-containing monomer, and the like.
- a vinyl ester monomer such as vinyl acetate, an aromatic vinyl compound such as styrene, a sulfonic acid group-containing monomer, a phosphoric acid group-containing monomer, and the like.
- an acrylic polymer obtained by copolymerizing a carboxy group-containing monomer and a hydroxyl group-containing monomer as the submonomer is preferable.
- the carboxy group-containing monomer include acrylic acid and methacrylic acid.
- the hydroxyl group-containing monomer include 2-hydroxyethyl acrylate and 4-hydroxybutyl acrylate.
- the amount of the submonomer is suitably 0.5% by weight or more, preferably 1% by weight or more, based on the total monomer components of the acrylic polymer. Further, the amount of the submonomer is suitably 30% by weight or less, preferably 10% by weight or less (for example, 5% by weight or less) in the total monomer components.
- the content of the carboxy group-containing monomer is, among all monomer components used for the synthesis of the acrylic polymer, from the viewpoint of coexistence of adhesive force and cohesive force. It is preferably in the range of about 0.1 to 10% by weight (eg 0.2 to 8% by weight, typically 0.5 to 5% by weight).
- the content of the hydroxyl group-containing monomer is approximately 0 out of all monomer components used for the synthesis of the acrylic polymer from the viewpoint of achieving both cohesion and cohesion. It is preferably within the range of 0.001 to 10% by weight (eg 0.01 to 5% by weight, typically 0.02 to 2% by weight). Further, when a vinyl ester monomer such as vinyl acetate is copolymerized as the submonomer, the content of the vinyl ester monomer is about 30% in the total monomer components used for the synthesis of the acrylic polymer. % Or less (typically 0.01 to 30% by weight, for example 0.1 to 10% by weight).
- the method for obtaining the acrylic polymer is not particularly limited, and various polymerization methods known as synthetic methods for acrylic polymers, such as solution polymerization, emulsion polymerization, bulk polymerization, and suspension polymerization, are appropriately employed. be able to. Active energy ray irradiation polymerization performed by irradiation with UV or the like may be employed.
- a monomer mixture is dissolved or dispersed in a suitable polymerization solvent (toluene, ethyl acetate, water, etc.), and a polymerization operation is performed using a polymerization initiator such as an azo polymerization initiator or a peroxide initiator.
- a desired acrylic polymer can be obtained.
- the weight average molecular weight (Mw) of the acrylic polymer disclosed herein is preferably in the range of 10 ⁇ 10 4 or more and 100 ⁇ 10 4 or less from the viewpoint of balancing the adhesive force and the cohesive force in a balanced manner.
- Mw means the value of standard polystyrene conversion obtained by GPC (gel permeation chromatography).
- the pressure-sensitive adhesive composition preferably contains a crosslinking agent from the viewpoint of increasing the cohesive force.
- the type of the crosslinking agent is not particularly limited, and one or more conventionally known crosslinking agents can be appropriately selected and used.
- Preferable examples of the crosslinking agent include isocyanate crosslinking agents and epoxy crosslinking agents.
- the amount of the crosslinking agent used is not particularly limited, and is, for example, about 10 parts by weight or less (for example, about 0.005 to 10 parts by weight, preferably about 0.01 to 5 parts by weight) with respect to 100 parts by weight of the acrylic polymer. You can choose from a range.
- the pressure-sensitive adhesive layer disclosed herein may have a composition containing a tackifier.
- the tackifier is not particularly limited, for example, rosin tackifier resin, terpene tackifier resin, hydrocarbon tackifier resin, epoxy tackifier resin, polyamide tackifier resin, elastomer tackifier resin, Various tackifying resins such as a phenolic tackifying resin and a ketone tackifying resin can be used. Such tackifier resin can be used individually by 1 type or in combination of 2 or more types.
- the softening point (softening temperature) of the tackifier resin is preferably about 60 ° C. or higher (preferably about 80 ° C. or higher, typically 100 ° C. or higher). Thereby, the adhesive sheet with higher adhesive force can be realized.
- the upper limit of the softening point of the tackifying resin is not particularly limited, and can be about 180 ° C. or lower (for example, about 140 ° C. or lower).
- the softening point of the tackifier resin here is defined as a value measured by a softening point test method (ring ball method) defined in any of JIS K5902: 2006 and JIS K2207: 2006.
- the amount of the tackifier used is not particularly limited, and can be appropriately set according to the target tack performance (adhesive strength, etc.).
- the tackifier is approximately 10 to 100 parts by weight (more preferably 20 to 80 parts by weight, more preferably 30 to 60 parts by weight) with respect to 100 parts by weight of the base polymer (preferably an acrylic polymer) based on the solid content. (Part by weight) is preferably used.
- the pressure-sensitive adhesive composition may be a leveling agent, a crosslinking aid, a plasticizer, a softener, a filler, an antistatic agent, an anti-aging agent, an ultraviolet absorber, an antioxidant, a light stabilizer, etc., if necessary.
- Various additives common in the field of pressure-sensitive adhesive compositions can be contained. About such various additives, a conventionally well-known thing should just be used by a conventional method.
- the pressure-sensitive adhesive layer disclosed herein may be a pressure-sensitive adhesive layer formed from a water-based, solvent-type, hot-melt type, active energy ray-curable pressure-sensitive adhesive composition, or the like.
- the water-based pressure-sensitive adhesive composition refers to a pressure-sensitive adhesive composition in a form containing a pressure-sensitive adhesive (pressure-sensitive adhesive layer forming component) in a water-based solvent (water-based solvent), and is typically dispersed in water.
- a type pressure-sensitive adhesive composition a composition in which at least a part of the pressure-sensitive adhesive is dispersed in water
- a solvent-type adhesive composition means the adhesive composition of the form which contains an adhesive in an organic solvent.
- a water-based pressure-sensitive adhesive composition is preferable from the viewpoint of reducing environmental burden, and a solvent-type pressure-sensitive adhesive composition is preferably used from the viewpoint of adhesive properties and the like.
- the pressure-sensitive adhesive layer disclosed herein can be formed by a conventionally known method.
- a method of forming a pressure-sensitive adhesive layer on the surface by applying a pressure-sensitive adhesive composition to a peelable surface (peeling surface) and drying it, and transferring the pressure-sensitive adhesive layer to a substrate can be preferably employed.
- a method (direct method) in which the pressure-sensitive adhesive layer is formed by directly applying (typically applying) the pressure-sensitive adhesive composition to the substrate and drying it may be employed.
- the release surface the surface of the release liner, the back surface of the substrate after the release treatment, or the like can be used.
- the adhesive composition for example, a gravure roll coater, a reverse roll coater, a kiss roll coater, a comma coater, a dip roll coater, a die coater, a bar coater, a knife coater, a spray coater or the like is used. Can be done.
- the pressure-sensitive adhesive composition may be applied by impregnation or curtain coating. From the viewpoint of promoting the crosslinking reaction and improving the production efficiency, the pressure-sensitive adhesive composition is preferably dried under heating. The drying temperature can be, for example, about 40 to 150 ° C., and is usually preferably about 60 to 130 ° C. After drying the pressure-sensitive adhesive composition, it may be further aged for the purpose of adjusting component migration in the pressure-sensitive adhesive layer, progress of the crosslinking reaction, relaxation of strain that may exist in the base material or pressure-sensitive adhesive layer, etc. Good.
- the thickness of the pressure-sensitive adhesive layer disclosed herein is not particularly limited and can be appropriately selected depending on the purpose. Usually, from the viewpoint of productivity such as drying efficiency and adhesive properties, it is appropriate to be about 0.5 to 200 ⁇ m, and about 2 to 200 ⁇ m (for example, 5 to 100 ⁇ m, typically 10 to 50 ⁇ m). It is preferable to do. In a preferred embodiment, the pressure-sensitive adhesive layer has a thickness of 20 ⁇ m or less, more preferably 10 ⁇ m or less, and even more preferably 7 ⁇ m or less (for example, 5 ⁇ m or less). According to the technique disclosed here, even if the thickness of the pressure-sensitive adhesive layer is limited as described above, good air escape properties can be obtained.
- limiting the thickness of the pressure-sensitive adhesive layer is advantageous in terms of reducing the thickness of the pressure-sensitive adhesive sheet, reducing the size, reducing the weight, and saving resources.
- the thickness of each pressure-sensitive adhesive layer may be the same or different.
- the coat layer that partially covers the surface of the pressure-sensitive adhesive layer is not particularly limited as long as it can impart air bleedability.
- a preferred example of the coating layer material is a resin material. From the viewpoint of appearance, a coat layer formed from a transparent or translucent resin material is preferable.
- the resin material that can constitute the coating layer examples include polyurethane resins, phenol resins, epoxy resins, polyamide resins, urea melamine resins, silicone resins, polysilazane resins, fluorine resins, phenoxy resins, methacrylic resins.
- vinyl, polyvinylidene chloride, polycarbonate, celluloses, polyacetal and the like examples of these resins may be one type or two or more types of resins selected from various types of resins such as thermosetting resins, ultraviolet curable resins, electron beam curable resins, and two-component mixed resins.
- the coating layer disclosed herein includes a filler, an antioxidant, an antioxidant, an ultraviolet absorber, a crosslinking agent, a lubricant, a colorant (pigment, dye, etc.), an antistatic agent, a fluidity modifier (thixotropic agent, Various additives such as thickeners and film-forming aids may be included as necessary.
- the coat layer is typically non-tacky or weakly tacky. Thereby, good air escape properties are preferably realized.
- that the coating layer is non-tacky or weakly tacky means that the 180 ° peel strength of the coating layer is less than 3 N / 25 mm (typically less than 1 N / 25 mm, and the adhesive force is too low to be measured. Including the case.)
- the 180 degree peel strength of the coat layer is measured by the following method. That is, for a measurement sample obtained by cutting a pressure-sensitive adhesive sheet having a coating layer on the entire surface of the pressure-sensitive adhesive layer into a size of 25 mm in width and 100 mm in length, the coating layer of the measurement sample is used at 23 ° C.
- the method for disposing the coat layer on the surface of the pressure-sensitive adhesive layer is not particularly limited, but typically, the following method is employed.
- the composition for forming a coat layer is prepared by dissolving or dispersing in a suitable solvent as necessary.
- the composition is also referred to as a peelable support (also referred to as “coat layer transfer film”, typically a release liner). Apply to the surface and cure.
- the peelable support body surface in which the coating layer was formed is contact
- a desired coat layer pattern such as a grid pattern can be preferably formed by employing a method such as offset printing, silk screen printing, letterpress printing, flexographic printing, gravure printing, or ink jet printing. From the viewpoint of air escape, gravure printing is more preferable.
- the same structure as described above can be obtained by further forming an adhesive layer on the peelable surface on which the coating layer is formed as described above so as to cover the coating layer. In this case, the formed pressure-sensitive adhesive layer is then transferred to the surface of the film-like substrate.
- a person skilled in the art adopts the method as described above, selects a coat layer material in consideration of the wettability of the peelable support to the peelable surface based on the common general knowledge in this technical field, and forms the coat layer.
- the coating layer having the cross-sectional shape disclosed herein can be formed by adjusting the viscosity of the composition for use to an appropriate range and further selecting, for example, an appropriate printing means.
- the thickness of the coat layer is not particularly limited as long as it is designed so as to obtain a desired air release property. From the viewpoint of the smoothness of the adhesive sheet adhesive surface and the lamination property on the adhesive layer, the thickness of the coat layer is not limited. Is preferably the same as the thickness of the pressure-sensitive adhesive layer or thinner than the thickness of the pressure-sensitive adhesive layer. In a preferred embodiment, the ratio of the coating layer thickness T C to the pressure-sensitive adhesive layer thickness T A (T C / T A ) is 0.75 or less, more preferably 0.70 or less, and even more preferably 0. .5 or less (for example, 0.4 or less).
- the thickness of the pressure-sensitive adhesive layer is 1 ⁇ m or more (preferably 2 ⁇ m or more, more preferably 3 ⁇ m or more) and the above ratio (T C / T A ) is satisfied, better smoothness is obtained. It is done.
- the thickness of the coating layer is not more than half of the thickness of the pressure-sensitive adhesive layer (for example, not more than 1/3, typically 1/5) from the viewpoint of achieving both air bleeding and appearance. Or less).
- the specific thickness of the coating layer is preferably 0.1 ⁇ m or more (for example, 0.5 ⁇ m or more, typically 1 ⁇ m or more) from the viewpoints of air escape properties, productivity, and the like. Further, from the viewpoint of the smoothness, laminateability and appearance of the adhesive sheet adhesive surface, the thickness of the coat layer is preferably 10 ⁇ m or less, more preferably 5 ⁇ m or less, and even more preferably 4 ⁇ m or less (for example, less than 4 ⁇ m, typically Is 3 ⁇ m or less), particularly preferably less than 3 ⁇ m (for example, 2 ⁇ m or less, typically less than 2 ⁇ m). According to the technique disclosed here, even if the coat layer is a thin layer as described above, good air escape characteristics can be obtained.
- the thin coating layer as described above is particularly preferable for an application requiring thinning (typically, a portable electronic device application).
- the thickness of a coating layer can be grasped
- the technique disclosed here is preferably implemented in the form of a pressure-sensitive adhesive sheet with a release liner provided with a release liner that protects the adhesive surface of the pressure-sensitive adhesive sheet.
- a conventional release paper or the like can be used as the release liner, and is not particularly limited.
- a low-adhesiveness of a release liner having a release treatment layer on the surface of a liner substrate such as a resin film such as PET or paper, or a fluorine-based polymer (polytetrafluoroethylene, etc.) or a polyolefin resin (PE, PP, etc.)
- a release liner made of a material can be used.
- the release treatment layer may be formed, for example, by surface-treating the liner base material with a release treatment agent such as silicone-based, long-chain alkyl-based, fluorine-based, or molybdenum sulfide.
- the peelable surface (the surface in contact with the adhesive surface of the pressure-sensitive adhesive sheet) of the release liner (release film) is formed smoothly.
- a coat layer is partially formed on the peelable surface of such a release liner, and the surface of the pressure-sensitive adhesive layer is brought into contact with the surface of the release liner on which the coat layer is partially formed so that the coat layer is the surface of the pressure-sensitive adhesive layer.
- the release liner also serves as a coat layer transfer film (release film)
- a coat layer is partially formed on the peelable surface of the release liner as described above, and an adhesive layer is further formed on the peelable surface on which the coat layer is formed so as to cover the coat layer.
- the formed pressure-sensitive adhesive layer is transferred to the surface of the film-like substrate.
- the arithmetic average surface roughness of the release surface of the release liner is 1 ⁇ m or less (eg, about 0.05 to 0.75 ⁇ m, typically about 0.1 to 0.5 ⁇ m). Is preferred.
- the release liner used for the production of the pressure-sensitive adhesive sheet disclosed herein may be a release liner 110 with a coat layer including a peelable support 120 having a peelable surface 120A as shown in FIG.
- the peelable support 120 may have a release treatment layer on at least one surface of the liner substrate, or may be a support made of a low adhesive material.
- a coat layer 30 that can be transferred to an adhesive sheet is provided on the peelable surface 120A of the peelable support 120. That is, the coat layer 30 is disposed on the peelable surface 120A in a state where it can be separated by the adhesive force of the pressure-sensitive adhesive.
- the configuration (shape, arrangement state, arrangement relationship, size, pattern, etc.) of the coat layer provided on the peelable surface of the peelable support is basically the same as the configuration of the coat layer on the adhesive surface of the adhesive sheet described above. Since there is, explanation is omitted. Also, the linearly extending portion of the coat layer provided on the release liner is basically the same except that the first surface is located on the peelable surface side and the second surface constitutes the outer surface on the peelable surface. The description is omitted because it is as described above.
- the thickness (total thickness) of the release liner is not particularly limited, but is preferably about 10 to 500 ⁇ m (for example, 15 to 100 ⁇ m) from the viewpoints of release workability, handleability, strength, and the like.
- the pressure-sensitive adhesive sheet disclosed herein can efficiently prevent generation of bubbles and the like between the adherend and the adherend. Therefore, in any pasting method of manual pasting (hand pasting) or pasting (automatic pasting) using an automatic pasting machine or the like, the pasting property is improved. For example, in the case of pasting by hand, the dependence on the individual skill can be reduced, so that advantages such as improvement and stabilization of pasting efficiency and pasting quality can be obtained. In addition, when pasting by automatic pasting, it is possible to realize a reduction in pasting failure such as mixing of bubbles and a reduction in pasting work.
- bubbles may be generated between the pressure-sensitive adhesive sheet and the adherend not only at the time of pasting but also as time passes after pasting.
- a relatively high temperature eg, 35 ° C. or higher
- the above-mentioned bubbles and the like are generated between the adhesive sheet and the adherend.
- the appearance may be deteriorated.
- the inside of a factory in summer, the outdoors, the inside of an electronic device, and the like are likely to be in a high temperature state as described above. According to the technology disclosed herein, generation of bubbles and the like can be prevented even when used in applications exposed to the high temperature environment as described above.
- the pressure-sensitive adhesive sheet disclosed herein can be preferably used for applications to be applied to the surface of various articles by taking advantage of the characteristics described above.
- it can be used as various decorative sheets, surface protective sheets, fixing sheets for printing plates such as flexographic printing, light shielding sheets, and the like.
- a decorative sheet typically a paint substitute sheet
- it is used for the purpose of, for example, improving the smoothness of the outer surface of the chassis and covering non-uniform portions such as screw holes on the surfaces of various members in an electronic device such as a display (typically a television display).
- a covering sheet By using such a covering sheet, it is possible to reduce the appearance unevenness on the outer surface of the adherend and make the dimensional accuracy uniform.
- it can be preferably used as an exterior sheet of a battery pack in which appearance is important.
- the pressure-sensitive adhesive sheet disclosed herein is configured to be thin, it is possible to maintain good pressure-sensitive adhesive properties while preventing deterioration of the appearance quality after pasting. Therefore, it can be preferably applied to applications (for example, portable electronic devices) where reduction in thickness and weight is required and resource saving is desired.
- applications for example, portable electronic devices
- mobile phones, smartphones, tablet computers, notebook computers, various wearable devices for example, wrist wear devices that can be worn on the wrist like wristwatches, modular devices that can be worn on parts of the body using clips, straps, etc.
- Eyewear type including glasses type (monocular type and binocular type, including head mount type), clothing type attached to shirts, socks, hats, etc., for example in the form of accessories, earwear type attached to ears like earphones Etc.), digital cameras, digital video cameras, audio equipment (portable music players, IC recorders, etc.), calculators (calculators, etc.), portable game machines, electronic dictionaries, electronic notebooks, electronic books, in-vehicle information equipment, portable radios, mobile phones Surface protective sheet for portable electronic devices such as TVs, portable printers, portable scanners, portable modems, etc.
- the pressure-sensitive adhesive sheet may have a frame shape (frame shape), a band shape (strip shape), or the like depending on the purpose or the like.
- “portable” means that it is not sufficient to be able to carry it alone, but to have a portability that allows an individual (standard adult) to carry it relatively easily. Shall mean.
- a pressure-sensitive adhesive sheet comprising a film-like base material and a pressure-sensitive adhesive layer provided on at least one surface of the film-like base material, A coating layer partially covering the surface of the pressure-sensitive adhesive layer;
- the adhesive surface of the pressure-sensitive adhesive sheet is composed of the pressure-sensitive adhesive layer and the coat layer,
- the coat layer has a portion extending linearly from one end of the adhesive surface to the other end,
- the linearly extending portion has a first surface constituting an adhesive surface of the pressure-sensitive adhesive sheet, and a second surface located on the pressure-sensitive adhesive layer side with respect to the first surface,
- the pressure-sensitive adhesive sheet, wherein the second surface of the linearly extending portion has a gentle curve as a whole in a cross section perpendicular to the longitudinal direction of the linearly extending portion.
- the second surface of the linearly extending portion has a gentle curve in the cross section perpendicular to the longitudinal direction of the linearly extending portion as it goes to the center starting from one end of the linearly extending portion.
- the pressure-sensitive adhesive sheet according to (1) above having a portion extending in the depth direction of the pressure-sensitive adhesive layer.
- the second surface of the linearly extending portion has an inclination extending in the depth direction of the pressure-sensitive adhesive layer from one end of the linearly extending portion in a cross section orthogonal to the longitudinal direction of the linearly extending portion.
- the pressure-sensitive adhesive sheet according to the above (1) or (2) comprising a portion and a flat portion including the deepest portion of the linearly extending portion and substantially parallel to the adhesive surface.
- the pressure-sensitive adhesive layer contains an acrylic polymer in a proportion exceeding 50% by weight of the polymer component contained in the pressure-sensitive adhesive layer,
- R 1 is a hydrogen atom or a methyl group.
- R 2 is a chain alkyl group having 1 to 20 carbon atoms.
- the acrylic polymer is an acrylic polymer obtained by copolymerizing at least one submonomer selected from the group consisting of acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, and 4-hydroxybutyl acrylate.
- the acryl-based polymer is copolymerized with a carboxy group-containing monomer, and the copolymerization ratio of the carboxy-group-containing monomer is 0.1 to 0.1% among all monomer components used for the synthesis of the acryl-based polymer.
- the pressure-sensitive adhesive sheet according to any one of (7) to (10), wherein the pressure-sensitive adhesive sheet is 10% by weight.
- the acrylic polymer is copolymerized with a hydroxyl group-containing monomer, The pressure-sensitive adhesive sheet according to any one of the above (7) to (11), wherein the copolymerization ratio of the hydroxyl group-containing monomer is 0.001 to 10% by weight in the total monomer components used for the synthesis of the acrylic polymer. .
- the pressure-sensitive adhesive sheet according to any one of (7) to (12), wherein the pressure-sensitive adhesive layer contains an isocyanate-based crosslinking agent and / or an epoxy-based crosslinking agent.
- the pressure-sensitive adhesive layer contains a tackifying resin having a softening point of 100 ° C. to 140 ° C. in a ratio of 30 to 60 parts by weight with respect to 100 parts by weight of the acrylic polymer,
- the tackifier resin is at least one selected from the group consisting of a rosin tackifier resin, a terpene tackifier resin, and a hydrocarbon tackifier resin, according to any one of the above (7) to (13).
- Adhesive sheet is at least one selected from the group consisting of a rosin tackifier resin, a terpene tackifier resin, and a hydrocarbon tackifier resin, according to any one of the above (7) to (13).
- the coating layer is made of polyurethane resin, phenol resin, epoxy resin, polyamide resin, urea melamine resin, silicone resin, polysilazane resin, fluorine resin, phenoxy resin, methacrylic resin, acrylic resin.
- the film-like substrate is a polyolefin resin film, a polyester resin film, a vinyl chloride resin film, a vinyl acetate resin film, a polyimide resin film, a polyamide resin film, a fluorine resin film, or a cellophane film.
- the ratio of the thickness T C of the coating layer to the thickness T A of the pressure-sensitive adhesive layer is 0.75 or less, in any one of (1) to (28) The adhesive sheet as described.
- the 1st adhesive layer provided on the 1st surface of the said film-like base material, and the 2nd adhesive layer provided on the 2nd surface of the said film-like base material With The pressure-sensitive adhesive sheet according to any one of (1) to (29), wherein the coat layer is partially disposed on a surface of at least one pressure-sensitive adhesive layer of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer. . (31) The pressure-sensitive adhesive sheet according to any one of (1) to (30), wherein the film-like substrate has a thickness of less than 5 ⁇ m. (32) The pressure-sensitive adhesive sheet according to any one of (1) to (31), wherein the total thickness is 50 ⁇ m or less.
- the pressure-sensitive adhesive layer surface has a coat layer arrangement part and a coat layer non-arrangement part, The pressure-sensitive adhesive sheet according to any one of the above (1) to (32), wherein the area ratio of the coat layer non-arranged portion on the surface of the pressure-sensitive adhesive layer is 70% or more.
- a plurality of the linearly extending portions are arranged on the pressure-sensitive adhesive layer surface, Among the plurality of linearly extending portions, the plurality of linearly extending portions constituting a group are arranged at intervals in the width direction, whereby the coat layer arranging portion has a stripe pattern.
- the coat layer arrangement portion includes a first stripe pattern portion and a second stripe pattern portion arranged so as to intersect with the first stripe pattern portion, thereby the coat layer arrangement.
- the interval between a plurality of linearly extending portions constituting one stripe pattern is in the range of 1.0 to 10 mm, according to (35) or (36) above Adhesive sheet.
- the pressure-sensitive adhesive sheet according to any one of the above (33) to (37), wherein the adhesive surface on which the coat layer is partially disposed exhibits a 180-degree peel strength after 24 hours of 13 N / 25 mm or more.
- a pressure-sensitive adhesive sheet with a release liner comprising the pressure-sensitive adhesive sheet according to any one of (1) to (38) above and a release liner that protects the adhesive surface of the pressure-sensitive adhesive sheet.
- a release liner for a pressure-sensitive adhesive sheet comprising a peelable support in which at least one surface is a peelable surface
- a release liner which is provided with a coat layer that can be transferred to an adhesive sheet on the peelable surface of the peelable support.
- the coat layer has a portion extending linearly from one end of the peelable surface to the other end,
- the linearly extending portion has a first surface located on the peelable surface side and a second surface constituting an outer surface on the peelable surface,
- the release liner according to (41), wherein the second surface of the linearly extending portion is configured by a gentle curve as a whole in a cross section perpendicular to the longitudinal direction of the linearly extending portion.
- the above (1) to (38), comprising the steps of forming a pressure-sensitive adhesive layer on the peelable surface of the peelable support and transferring the pressure-sensitive adhesive layer to the surface of the film-like substrate.
- a method for producing the pressure-sensitive adhesive sheet according to any one of A coat layer is partially formed on the peelable surface of the peelable support, and the step of forming the pressure-sensitive adhesive layer includes the step of forming the pressure-sensitive adhesive layer on the peelable surface on which the coat layer is formed. Or a coating layer is not formed on the peelable surface of the peelable support, and after the step of transferring the pressure-sensitive adhesive layer, the peelable support is removed from the pressure-sensitive adhesive.
- a coat layer-forming peelable support having a coat layer partially formed on a peelable surface is prepared, and the coat layer-forming peelable support is transferred to the surface of the pressure-sensitive adhesive layer.
- a method for producing the adhesive layer (45) a step of partially forming a coat layer on the peelable surface of the peelable support; Further forming a pressure-sensitive adhesive layer on the peelable surface on which the coating layer is formed; Transferring the pressure-sensitive adhesive layer to the surface of the film-like substrate; A method for producing the pressure-sensitive adhesive sheet according to any one of the above (1) to (38).
- Mw of the obtained acrylic polymer was about 440,000.
- 30 parts of polymerized rosin pentaerythritol ester made by Arakawa Chemical Industries, trade name “Pencel D-125”, softening point 125 ° C.
- an isocyanate-based crosslinking agent trade name “Coronate L”, manufactured by Nippon Polyurethane Industry Co., Ltd.
- a coat layer forming material (urethane-based: two-component mixed curable ink) was applied to the peelable surface of a 75 ⁇ m-thick release film (trade name “FMN-75WD (C1-CA1)” manufactured by Fujiko) by gravure printing. Then, a coat layer (coating thickness of about 1.5 ⁇ m, transparent) having a lattice pattern was formed. Thus, the coating layer formation peeling film in which the coating layer was partially formed in the peelable surface was obtained.
- a coat layer forming material (urethane-based: two-component mixed curable ink) was applied to the peelable surface of a 75 ⁇ m-thick release film (trade name “FMN-75WD (C1-CA1)” manufactured by Fujiko) by gravure printing. Then, a coat layer (coating thickness of about 1.5 ⁇ m, transparent) having a lattice pattern was formed. Thus, the coating layer formation peeling film in which the coating layer was partially formed in the peelable surface was obtained.
- the pressure-sensitive adhesive composition was applied to a release-treated surface of a release film having a thickness of 38 ⁇ m (trade name “Diafoil MRF38”, manufactured by Mitsubishi Plastics Co., Ltd.) so that the final thickness was 13 ⁇ m, and 100 ° C. And dried for 3 minutes to obtain a pressure-sensitive adhesive layer supported by a release film. And the adhesive layer obtained above was transcribe
- a coat layer-forming pressure-sensitive adhesive layer is disposed on the first surface of the PET base material, and a non-coat layer-forming pressure-sensitive adhesive layer is provided on the other side.
- a double-sided PSA sheet with a substrate was prepared.
- One adhesive surface of this pressure-sensitive adhesive sheet is a coating layer-forming adhesive surface on which a lattice pattern composed of the coating layer shown in FIG. 1 is formed.
- the width (line width) of the belt-like portion of the coating layer is about 200 ⁇ m.
- the pitch was about 2 mm, and the area ratio of the coat layer on the adhesive surface of the pressure-sensitive adhesive sheet was 19%.
- FIGS. 9 to 12 show SEM cross-sectional images of the obtained pressure-sensitive adhesive sheet.
- This cross-sectional image is a photographed image in a cross section orthogonal to the longitudinal direction of the linearly extending portion of the coat layer, and the coat layer in the figure shows one of the strip-like portions of the lattice pattern.
- the other adhesive surface of the pressure-sensitive adhesive sheet is a coating layer non-formed adhesive surface.
- One adhesive surface (non-coated layer adhesive surface) of the double-sided PSA sheet according to the example was exposed, lined with a 25 ⁇ m thick PET film, and cut into a 50 mm ⁇ 50 mm square shape to prepare a measurement sample.
- the measurement sample is exposed such that the coating layer-forming adhesive surface of the measurement sample is exposed, and the coating layer-forming adhesive surface is on the adherend side on a horizontally mounted stainless steel plate (SUS plate). (Not crimped).
- SUS plate horizontally mounted stainless steel plate
- a bubble forming rubber plate is prepared, and this is placed on the measurement sample and pressed, so that bubbles are formed between the adhesion surface (coating layer formation adhesion surface) of the measurement sample and the adherend surface. Formed.
- a rubber plate having a square shape of 50 mm ⁇ 50 mm and a square opening (through hole) of 20 mm ⁇ 20 mm at the center of the surface was prepared as a bubble forming rubber plate.
- This bubble forming rubber plate is overlaid on the upper surface (backing surface) of the measurement sample, and pressed from above on the condition of 3 kgf for 5 seconds, and the adhesion surface of the measurement sample at the portion corresponding to the frame shape of the rubber plate ( The adhesion surface (coat layer formation adhesion surface) and the adherend surface are pressure-bonded, and the adhesion surface (coating layer formation adhesion surface) of the measurement sample in the non-load area (20 mm ⁇ 20 mm square area) corresponding to the opening of the rubber plate Bubbles were formed between the surface of the adherend.
- the bubble forming rubber plate on the backing surface of the measurement sample is removed, and a 50 mm ⁇ 50 mm square rubber plate (no opening) is overlaid on the backing surface of the measurement sample, and 3 kgf, Pressing was performed for 15 seconds.
- the rubber plate was removed, and the pre-formed bubbles were visually confirmed.
- the trade name “NEO-200” thinness: 3 mm
- the rubber plate for forming bubbles a processed rubber plate of the same type was used.
- no air bubbles remained on the adhesive surface (coating layer forming adhesive surface) of the pressure-sensitive adhesive sheet, and it was confirmed that the pressure-sensitive adhesive sheet according to the example has good air escape properties.
- Adhesive strength expression rate surface state of adhesive surface
- One adhesive surface (non-coated layer-adhered surface) of the double-sided PSA sheet according to the example was exposed, lined with a 50 ⁇ m-thick PET film, and cut into a size of 20 mm ⁇ 100 mm to prepare a measurement sample.
- the coating layer forming adhesion surface of the measurement sample is exposed, and the exposed adhesion surface of the measurement sample is moved back and forth once on a stainless steel plate (SUS plate) in an environment of 23 ° C. and 50% RH. Crimped.
- SUS plate stainless steel plate
- the peel strength (N / 20 mm) was measured using a universal tensile compression tester under the conditions of a tensile speed of 300 mm / min and a peel angle of 180 degrees according to JIS Z 0237: 2000. Measured (adhesive strength after 24 hours).
- the pressure-sensitive adhesive sheet (coating layer-unformed pressure-sensitive adhesive sheet) produced in the same manner as in Example except that the coat layer was not formed was also used in the same manner as described above, 24 hours after being attached to the adherend.
- the peel strength P C (N / 20 mm) was measured.
- the pressure-sensitive adhesive (P M ⁇ P T ⁇ 0.9) It can be evaluated that the coat layer formed on the surface of the adhesive layer is well adapted to the adhesive layer, the surface state of the adhesive surface of the adhesive sheet (coating layer forming adhesive surface) is good, and a value close to the theoretical value is realized. .
- the actually measured value P M of the peel strength was less than 90% of the theoretical peel strength P T.
- [Thickness tolerance] Prepare the pressure-sensitive adhesive sheet according to the example, using a dial gauge, 10 points of intersection of the lattice of the coat layer and 10 points of the center of the exposed portion of the rectangular adhesive layer surrounded by the coat layer of the lattice pattern, The thickness was measured, and the maximum value T M ( ⁇ m) and the standard thickness T S ( ⁇ m) were substituted into the formula: (T M ⁇ T S ) / T S ⁇ 100; The value was used as thickness tolerance (%).
- the thickness tolerance of the adhesive sheet according to the example is 50% or less, and can be evaluated as a pass level.
- the pressure-sensitive adhesive sheets according to the examples showed good air escape properties. This is presumably because the coat layer partially formed on the surface of the pressure-sensitive adhesive layer sufficiently functioned as an air escape means. Further, as shown in FIGS. 9 to 12, in the pressure-sensitive adhesive sheet according to the example, the linearly extending portion of the coat layer (one band portion of the lattice pattern) had a predetermined cross-sectional shape. Specifically, the second surface located on the pressure-sensitive adhesive layer side of the linearly extending portion was constituted by a gentle curve as a whole in a cross section perpendicular to the longitudinal direction of the linearly extending portion.
- the pressure-sensitive adhesive sheet including the coat layer having the above-described cross-sectional shape has a good surface condition of the adhesive surface, a small thickness tolerance, and a high quality. From the above results, it can be seen that by setting the cross-sectional shape of the coat layer to a specific shape, good air escape properties can be obtained and further higher quality can be realized.
- Adhesive sheet 1A Adhesive surface 10 Film-like base material 20,21,22 Adhesive layer 20A Adhesive layer surface 30 Coat layer 40 Coat layer pattern (lattice pattern) 42 1st stripe-shaped pattern part 44 2nd stripe-like pattern part 50 The part (band-like part) extended linearly 52 1st surface 54 2nd surface 56 One end (left end) of the width direction of the part extended linearly 58 The other end in the width direction of the linearly extending part (right end) 60 Inclined portion 62 Flat portion 70 Coat layer placement portion 72 Coat layer non-placement portion 100, 101, 102 Release liner 110 Release liner with coat layer 120 Release support 120A Release surface
Abstract
Description
本出願は、2014年11月28日に出願された日本国特許出願2014-242183号および2015年8月21日に出願された日本国特許出願2015-164269号に基づく優先権を主張しており、それら出願の全内容は本明細書中に参照として組み入れられている。
粘着剤層を構成する粘弾性体は、上記のような断面形状を有するコート層にフィットしやすい。そのため、例えばコート層の表面パターンや厚さが同じであっても、上記の断面形状を有するコート層を備えるものは、そうでないものと比べて、粘着剤層の表面状態や、粘着剤層とコート層との密着状態に優れたものとなり得る。したがって、上記構成によると、粘着剤層の表面を部分的に覆うコート層を備える粘着シートにおいて、良好な空気抜け性を得つつ、さらなる高品質化が可能となる。また、特に限定的に解釈されるものではないが、本発明の効果は、コート層の新規な断面形状によって得られることから、粘着剤成分やコート層材料は制限されない。このことは、例えば特許文献1において、溝の形状を保持するために粘着剤として比較的硬めの材料が用いられるといったような使用材料の制限を解消する効果をもたらし得る。
ここに開示される粘着シートは、その粘着剤層表面におけるコート層非配置部の面積割合(粘着シートの接着面におけるコート層の面積割合でもあり得る。)が70%以上であることが好ましい。これにより、高い経時接着力を確保することができる。上記面積割合は、より好ましくは75%以上、さらに好ましくは80%以上である。良好な空気抜け性を得る観点からは、上記面積割合は、好ましくは90%以下、より好ましくは85%以下である。
ここに開示されるフィルム状基材としては、例えば、樹脂フィルム、紙、布、ゴムフィルム、発泡体フィルム、金属箔、これらの複合体や積層体等を用いることができる。なかでも、貼り付け性や外観性の観点から、樹脂フィルム層を含むことが好ましい。樹脂フィルム層を含むことは、寸法安定性、厚さ精度、加工性、引張強度等の観点からも有利である。樹脂フィルムの例としては、ポリエチレン(PE)、ポリプロピレン(PP)、エチレン・プロピレン共重合体等のポリオレフィン系樹脂フィルム;ポリエチレンテレフタレート(PET)、ポリブチレンテレフタレート、ポリエチレンナフタレート等のポリエステル系樹脂フィルム;塩化ビニル系樹脂フィルム;酢酸ビニル系樹脂フィルム;ポリイミド系樹脂フィルム;ポリアミド系樹脂フィルム;フッ素系樹脂フィルム;セロハン;等が挙げられる。好適例としては、PE、PP、PETから形成された樹脂フィルムが挙げられる。樹脂フィルムのなかでは、ポリエステルフィルムがより好ましく、そのなかでもPETフィルムがさらに好ましい。フィルム状基材は、単層構造であってもよく、2層または3層以上の多層構造を有してもよい。
ここに開示される粘着剤層は、典型的には、室温付近の温度域において柔らかい固体(粘弾性体)の状態を呈し、圧力により簡単に被着体に接着する性質を有する材料(粘着剤)から構成された層をいう。ここでいう粘着剤は、「C. A. Dahlquist, “Adhesion : Fundamental and Practice”, McLaren & Sons, (1966) P. 143」に定義されているとおり、一般的に、複素引張弾性率E*(1Hz)<107dyne/cm2を満たす性質を有する材料(典型的には、25℃において上記性質を有する材料)である。
CH2=C(R1)COOR2 (1)
ここで、上記式(1)中のR1は水素原子またはメチル基である。また、R2は炭素原子数1~20の鎖状アルキル基(以下、このような炭素原子数の範囲を「C1-20」と表すことがある。)である。粘着剤の貯蔵弾性率等の観点から、R2がC1-12(例えばC2-10、典型的にはC4-8)の鎖状アルキル基であるアルキル(メタ)アクリレートが好ましい。上記R2がC1-20の鎖状アルキル基であるアルキル(メタ)アクリレートは、1種を単独でまたは2種以上を組み合わせて用いることができる。好ましいアルキル(メタ)アクリレートとして、n-ブチルアクリレートおよび2-エチルヘキシルアクリレートが挙げられる。
架橋反応の促進、製造効率向上等の観点から、粘着剤組成物の乾燥は加熱下で行うことが好ましい。乾燥温度は、例えば40~150℃程度とすることができ、通常は60~130℃程度とすることが好ましい。粘着剤組成物を乾燥させた後、さらに、粘着剤層内における成分移行の調整、架橋反応の進行、基材や粘着剤層内に存在し得る歪の緩和等を目的としてエージングを行ってもよい。
粘着剤層表面を部分的に覆うコート層は、空気抜け性を付与し得るものであればよく、その限りにおいて特に制限はない。コート層材料の好適例としては樹脂材料が挙げられる。外観性の観点から、透明または半透明の樹脂材料から形成されたコート層が好ましい。
ここに開示される技術は、上述の粘着シートの接着面を保護する剥離ライナーを備える剥離ライナー付き粘着シートの形態で好ましく実施される。剥離ライナーとしては、慣用の剥離紙等を使用することができ、特に限定されない。例えば、PET等の樹脂フィルムや紙等のライナー基材の表面に剥離処理層を有する剥離ライナーや、フッ素系ポリマー(ポリテトラフルオロエチレン等)やポリオレフィン系樹脂(PE、PP等)の低接着性材料からなる剥離ライナー等を用いることができる。上記剥離処理層は、例えば、シリコーン系、長鎖アルキル系、フッ素系、硫化モリブデン等の剥離処理剤により上記ライナー基材を表面処理して形成されたものであり得る。
(1) フィルム状基材と、該フィルム状基材の少なくとも一方の表面上に設けられた粘着剤層と、を備える粘着シートであって、
前記粘着剤層の表面を部分的に覆うコート層をさらに備え、
前記粘着シートの接着面は、前記粘着剤層と前記コート層とによって構成されており、
前記コート層は、前記接着面の一端から他端に向かって線状に延びる部分を有しており、
前記線状に延びる部分は、前記粘着シートの接着面を構成する第1面と、該第1面に対して該粘着剤層側に位置する第2面と、を有しており、
前記線状に延びる部分の第2面は、該線状に延びる部分の長手方向に直交する断面において、全体としてなだらかな曲線で構成されている、粘着シート。
(2) 前記線状に延びる部分の第2面は、該線状に延びる部分の長手方向に直交する断面において、該線状に延びる部分の一端を起点として中央に向かうにつれて、なだらかな曲線で前記粘着剤層の深さ方向に延びる部分を有する、上記(1)に記載の粘着シート。
(3) 前記線状に延びる部分の第2面は、該線状に延びる部分の長手方向に直交する断面において、該線状に延びる部分の一端から前記粘着剤層の深さ方向に延びる傾斜部と、該線状に延びる部分の最深部を含み且つ前記接着面にほぼ平行する平坦部と、を有する、上記(1)または(2)に記載の粘着シート。
(4) 前記傾斜部は、前記粘着剤層側に凸に湾曲している、上記(3)に記載の粘着シート。
(5) 前記線状に延びる部分は、その厚さTに対する幅Wの比(W/T)が50以上である、上記(1)~(4)のいずれかに記載の粘着シート。
(6) 前記線状に延びる部分の幅は100μm以上である、上記(1)~(5)のいずれかに記載の粘着シート。
前記アクリル系ポリマーは、モノマー成分として、式(1):
CH2=C(R1)COOR2 (1)
(上記式(1)中のR1は水素原子またはメチル基である。また、R2は炭素原子数1~20の鎖状アルキル基である。);で表されるアルキル(メタ)アクリレートを50重量%を超える割合で含む、上記(1)~(6)のいずれかに記載の粘着シート。
(8) 前記アルキル(メタ)アクリレートは、n-ブチルアクリレートおよび/または2-エチルヘキシルアクリレートである、上記(7)に記載の粘着シート。
(9) 前記アクリル系ポリマーは、副モノマーとしてカルボキシ基含有モノマーおよび/または水酸基含有モノマーが共重合されたアクリル系ポリマーである、上記(7)または(8)のいずれかに記載の粘着シート。
(10) 前記アクリル系ポリマーは、アクリル酸、メタクリル酸、2-ヒドロキシエチルアクリレートおよび4-ヒドロキシブチルアクリレートからなる群から選択される少なくとも1種の副モノマーが共重合されたアクリル系ポリマーである、上記(7)~(9)のいずれかに記載の粘着シート。
(11) 前記アクリル系ポリマーには、カルボキシ基含有モノマーが共重合されており、前記カルボキシ基含有モノマーの共重合割合は、前記アクリル系ポリマーの合成に使用する全モノマー成分中、0.1~10重量%である、上記(7)~(10)のいずれかに記載の粘着シート。
(12) 前記アクリル系ポリマーには水酸基含有モノマーが共重合されており、
前記水酸基含有モノマーの共重合割合は、前記アクリル系ポリマーの合成に使用する全モノマー成分中、0.001~10重量%である、上記(7)~(11)のいずれかに記載の粘着シート。
(13) 前記粘着剤層は、イソシアネート系架橋剤および/またはエポキシ系架橋剤を含む、上記(7)~(12)のいずれかに記載の粘着シート。
(14) 前記粘着剤層は、軟化点が100℃~140℃である粘着付与樹脂を、前記アクリル系ポリマー100重量部に対して30~60重量部の割合で含み、
前記粘着付与樹脂は、ロジン系粘着付与樹脂、テルペン系粘着付与樹脂および炭化水素系粘着付与樹脂からなる群から選択される少なくとも1種である、上記(7)~(13)のいずれかに記載の粘着シート。
(16) 前記コート層は、ポリウレタン系樹脂、フェノール系樹脂、エポキシ系樹脂、ポリアミド系樹脂、尿素メラミン系樹脂、シリコーン系樹脂、ポリシラザン系樹脂、フッ素系樹脂、フェノキシ樹脂、メタクリル系樹脂、アクリル系樹脂、アクリル-ウレタン系樹脂、アクリル-スチレン系樹脂、ポリアリレート樹脂、ポリエステル系樹脂、ポリオレフィン系樹脂、ポリスチレン系樹脂、ポリ塩化ビニル、塩化ビニル-酢酸ビニル共重合体、ポリ酢酸ビニル、ポリ塩化ビニリデン、ポリカーボネート、セルロース類およびポリアセタールからなる群から選択される少なくとも1種の樹脂を含む、上記(1)~(15)のいずれかに記載の粘着シート。
(17) 前記コート層はポリウレタン系樹脂である、上記(1)~(16)のいずれかに記載の粘着シート。
(18) 前記コート層は、二液混合硬化型のポリウレタン系樹脂である、上記(1)~(17)のいずれかに記載の粘着シート。
(19) 前記フィルム状基材は、ポリオレフィン系樹脂フィルム、ポリエステル系樹脂フィルム、塩化ビニル系樹脂フィルム、酢酸ビニル系樹脂フィルム、ポリイミド系樹脂フィルム、ポリアミド系樹脂フィルム、フッ素系樹脂フィルムまたはセロハンフィルムである、上記(1)~(18)のいずれかに記載の粘着シート。
(20) 前記フィルム状基材はポリエステルフィルムである、上記(1)~(19)のいずれかに記載の粘着シート。
(21) 前記フィルム状基材はポリエチレンテレフタレートフィルムである、上記(1)~(20)のいずれかに記載の粘着シート。
(22) 前記フィルム状基材は80%以上の全光線透過率を示す、上記(1)~(21)のいずれかに記載の粘着シート。
(23) 前記フィルム状基材は発泡体フィルムである、上記(1)~(18)のいずれかに記載の粘着シート。
(24) 前記発泡体フィルムの平均気泡径は10~200μmであり、密度は0.01~0.7g/cm3である、上記(23)に記載の粘着シート。
(25) 前記発泡体フィルムは、アクリル系樹脂発泡体またはポリオレフィン系樹脂発泡体である、上記(23)または(24)に記載の粘着シート。
(27) 携帯電子機器に用いられる、上記(1)~(26)のいずれかに記載の粘着シート。
(28) 前記粘着剤層の厚さは20μm以下である、上記(1)~(27)のいずれかに記載の粘着シート。
(29) 前記粘着剤層の厚さTAに対する前記コート層の厚さTCの比(TC/TA)は0.75以下である、上記(1)~(28)のいずれかに記載の粘着シート。
(30) 前記粘着剤層として、前記フィルム状基材の第1表面上に設けられた第1粘着剤層と、前記フィルム状基材の第2表面上に設けられた第2粘着剤層と、を備え、
前記第1粘着剤層および第2粘着剤層の少なくとも一方の粘着剤層の表面に前記コート層が部分的に配置されている、上記(1)~(29)のいずれかに記載の粘着シート。
(31) 前記フィルム状基材の厚さは5μm未満である、上記(1)~(30)のいずれかに記載の粘着シート。
(32) 総厚さが50μm以下である、上記(1)~(31)のいずれかに記載の粘着シート。
前記粘着剤層表面における前記コート層非配置部の面積割合は70%以上である、上記(1)~(32)のいずれかに記載の粘着シート。
(34) 前記線状に延びる部分の幅は0.1~2mmの範囲内である、上記(33)に記載の粘着シート。
(35) 前記粘着剤層表面には、前記線状に延びる部分が複数配置されており、
前記複数の線状に延びる部分のうち一群を構成する複数の線状に延びる部分は、その幅方向にて間隔をおいて配置されており、これによって、前記コート層配置部はストライプ状パターンを有する、上記(33)または(34)に記載の粘着シート。
(36) 前記コート層配置部は、第1ストライプ状パターン部と、該第1ストライプ状パターン部と交差するように配置された第2ストライプ状パターン部とを含み、これによって、前記コート層配置部は格子状パターンを有する、上記(35)に記載の粘着シート。
(37) 前記コート層配置部において、一のストライプ状パターンを構成する複数の線状に延びる部分の間隔は1.0~10mmの範囲内である、上記(35)または(36)に記載の粘着シート。
(38) 前記コート層が部分的に配置された接着面は、13N/25mm以上の24時間経過後180度剥離強度を示す、上記(33)~(37)のいずれかに記載の粘着シート。
(40) 前記剥離ライナーの表面のうち前記接着面側の表面は、平滑に形成されている、上記(39)に記載の剥離ライナー付き粘着シート。
(41) 少なくとも一方の表面が剥離性表面である剥離性支持体を備える粘着シート用剥離ライナーであって、
前記剥離性支持体の剥離性表面上には、ここに開示されるいずれかのコート層であって粘着シートに転写可能なコート層が設けられている、剥離ライナー。
(42) 前記コート層は、前記剥離性表面の一端から他端に向かって線状に延びる部分を有しており、
前記線状に延びる部分は、前記剥離性表面側に位置する第1面と、該剥離性表面上において外表面を構成する第2面と、を有しており、
前記線状に延びる部分の第2面は、該線状に延びる部分の長手方向に直交する断面において、全体としてなだらかな曲線で構成されている、上記(41)に記載の剥離ライナー。
(43) 前記コート層の厚さは3μm未満である、上記(41)または(42)に記載の剥離ライナー。
(44) 剥離性支持体の剥離性表面上に粘着剤層を形成する工程と、フィルム状基材の表面に前記粘着剤層を転写する工程と、を含む、上記(1)~(38)のいずれかに記載の粘着シートを製造する方法であって、
前記剥離性支持体の剥離性表面上にはコート層が部分的に形成されており、前記粘着剤層を形成する工程は、前記コート層が形成された前記剥離性表面上に粘着剤層をさらに形成する工程であるか;あるいは
前記剥離性支持体の剥離性表面上にはコート層が形成されておらず、前記粘着剤層を転写する工程の後、前記剥離性支持体を前記粘着剤層から除去し、
剥離性表面上にコート層が部分的に形成されたコート層形成剥離性支持体を用意し、前記コート層形成剥離性支持体を、該コート層が前記粘着剤層の表面に転写されるように該粘着剤層に重ねる;ことを特徴とする、製造方法。
(45) 剥離性支持体の剥離性表面上にコート層を部分的に形成する工程と;
前記コート層が形成された前記剥離性表面上に粘着剤層をさらに形成する工程と;
フィルム状基材の表面に前記粘着剤層を転写する工程と;
を含む、上記(1)~(38)のいずれかに記載の粘着シートを製造する方法。
(粘着剤組成物の調製)
攪拌機、温度計、窒素ガス導入管、還流冷却器、滴下ロートを備えた反応容器に、n-ブチルアクリレート70部と、2-エチルヘキシルアクリレート30部と、アクリル酸3部と、4-ヒドロキシブチルアクリレート0.05部と、重合開始剤としてアゾビスイソブチロニトリル0.08部と、重合溶媒としてのトルエンとを仕込み、60℃で6時間溶液重合してアクリル系ポリマーのトルエン溶液(粘度28Pa・s、固形分40%)を得た。得られたアクリル系ポリマーのMwは約44万であった。
上記トルエン溶液に含まれるアクリル系ポリマー100部に対し、粘着付与樹脂としての重合ロジンペンタエリスリトールエステル(荒川化学工業社製、商品名「ペンセルD-125」、軟化点125℃)30部を加えた後、イソシアネート系架橋剤(日本ポリウレタン工業社製、商品名「コロネートL」)3部を添加、混合して、アクリル系粘着剤組成物を調製した。
厚さ75μmの剥離フィルム(フジコー社製、商品名「FMN-75WD(C1-CA1)」)の剥離性表面にコート層形成材料(ウレタン系:2液混合硬化型インク)をグラビア印刷により付与し、格子状パターンを有するコート層(塗布厚約1.5μm、透明)を形成した。このようにして、コート層が剥離性表面に部分的に形成されたコート層形成剥離フィルムを得た。
上記で得たコート層形成剥離フィルムのコート層形成剥離性表面に、上記粘着剤組成物を最終的な厚さが13μmとなるように塗布、乾燥し、剥離フィルムに支持された形態の粘着剤層を得た。そして、厚さ4μmのPETフィルム基材(商品名「ルミラー」、東レ社製)を用意し、このPET基材の第1面(コロナ放電処理面)に、上記で得た粘着剤層を剥離フィルムに支持された状態で転写した。剥離フィルムは、そのまま粘着剤層表面の保護に用いた。
また、厚さ38μmの剥離フィルム(商品名「ダイヤホイルMRF38」、三菱樹脂社製)の剥離処理面に、上記粘着剤組成物を最終的な厚さが13μmとなるように塗布し、100℃で3分間乾燥させ、剥離フィルムに支持された形態の粘着剤層を得た。そして、上記PET基材の第2面(コロナ放電処理面)に、上記で得た粘着剤層を剥離フィルムに支持された状態で転写した。剥離フィルムは、そのまま粘着剤層表面の保護に用いた。
上記の方法で各粘着剤層をPET基材の両面に転写することにより、PET基材の第1面にコート層形成粘着剤層が配置され、他方の面にコート層非形成粘着剤層が配置された基材付き両面粘着シートを作製した。この粘着シートの一方の接着面は、図1に示すコート層からなる格子状パターンが形成されたコート層形成接着面であり、コート層の帯状部分の幅(線幅)は約200μm、帯状部分のピッチは約2mmであり、粘着シートの接着面におけるコート層の面積割合は19%であった。得られた粘着シートのSEM断面画像を図9~12に示す。この断面画像は、コート層の線状に延びる部分の長手方向に直交する断面における撮影画像であり、図中のコート層は、格子状パターンの帯状部分の一つを示している。上記粘着シートの他方の接着面は、コート層非形成接着面である。
実施例に係る両面粘着シートの一方の接着面(コート層非形成接着面)を露出させ、厚さ25μmのPETフィルムで裏打ちし、50mm×50mmの正方形状にカットして測定サンプルを作製した。この測定サンプルのコート層形成接着面を露出させ、水平に載置された被着体としてのステンレス鋼板(SUS板)の上に、上記コート層形成接着面が被着体側となるように測定サンプルを乗せた(圧着はしない)。
次に、気泡形成用ゴム板を用意し、これを上記測定サンプルの上に重ねて、プレスすることにより、測定サンプルの接着面(コート層形成接着面)と被着体表面との間に気泡を形成した。具体的には、気泡形成用ゴム板として、50mm×50mmの正方形状を有し、その面中央に20mm×20mmの正方形状の開口(貫通孔)を有するゴム板を用意した。この気泡形成用ゴム板を上記測定サンプルの上面(裏打ち面)に重ねて、その上から3kgf、5秒間の条件でプレスし、当該ゴム板の枠形状に対応する部分における測定サンプルの接着面(コート層形成接着面)と被着体表面とを圧着させ、ゴム板の開口に対応する非荷重領域(20mm×20mmの正方形状領域)における測定サンプルの接着面(コート層形成接着面)と被着体表面との間に気泡を形成した。
そして、上記測定サンプルの裏打ち面上の気泡形成用ゴム板を取り除いて、50mm×50mmの正方形状のゴム板(開口なし)を上記測定サンプルの裏打ち面上に重ねて、その上から、3kgf、15秒間の条件でプレスした。ゴム板を取り除き、予め形成した気泡の抜け具合を目視で確認した。なお、ゴム板としては、入間川ゴム社製の商品名「NEO-200」(厚さ3mm)を使用し、気泡形成用ゴム板としては、同種のゴム板を加工したものを用いた。
目視観察の結果、粘着シートの接着面(コート層形成接着面)に気泡の残存は認められず、実施例に係る粘着シートは良好な空気抜け性を有することが確認された。
実施例に係る両面粘着シートの一方の接着面(コート層非形成接着面)を露出させ、厚さ50μmのPETフィルムで裏打ちし、20mm×100mmのサイズにカットして測定サンプルを作製した。この測定サンプルのコート層形成接着面を露出させ、23℃、50%RHの環境下にて、上記測定サンプルの露出接着面をステンレス鋼板(SUS板)の表面に5kgのローラを1往復させて圧着した。同環境に24時間放置した後、万能引張圧縮試験機を使用して、JIS Z 0237:2000に準じて、引張速度300mm/分、剥離角度180度の条件で、剥離強度(N/20mm)を測定した(24時間経過後接着力)。
また、コート層を形成しなかった他は実施例と同様にして作製した粘着シート(コート層非形成粘着シート)についても、上記と同様にして、被着体に貼り合わせてから24時間後の剥離強度PC(N/20mm)を測定した。
そして、上記コート層非形成粘着シート(接着面における粘着剤層の面積割合100%、コート層の面積割合0%)の剥離強度PCを100%として、実施例に係る粘着シートの接着面におけるコート層の面積割合を差し引き、実施例に係る粘着シートの理論剥離強度PT(N/20mm)を求めた。実施例では、粘着シートの接着面(コート層形成接着面)におけるコート層の面積割合が19%であったので、100-19=81%から、PT=PC×0.81となる。この理論剥離強度PTに対して実測値PM(実施例に係る粘着シートの上記条件で測定された剥離強度)が90%以上であれば(PM≧PT×0.9)、粘着剤層表面に形成されたコート層が粘着剤層によく馴染み、粘着シートの接着面(コート層形成接着面)の表面状態が良く、理論値に近い値を実現したものと評価することができる。
実施例に係る粘着シートにつき、上記の評価を行った結果、上記剥離強度の実測値PMは、理論剥離強度PTに対して90%以上であった。
実施例に係る粘着シートを用意し、ダイヤルゲージを用いて、コート層の格子の交点10点と、格子状パターンのコート層に囲まれた矩形状の粘着剤層露出部分の中心10点につき、厚さを測定し、そのなかの最大値TM(μm)と標準厚さTS(μm)とを、式:(TM-TS)/TS×100;に代入し、得られた値を厚み公差(%)として用いた。実施例に係る粘着シートの厚み公差は50%以下であり、合格レベルと評価できる。
上記の結果から、コート層の断面形状を特定の形状とすることにより、良好な空気抜け性が得られ、かつ、さらなる高品質化が実現されることがわかる。
1A 接着面
10 フィルム状基材
20,21,22 粘着剤層
20A 粘着剤層表面
30 コート層
40 コート層パターン(格子状パターン)
42 第1ストライプ状パターン部
44 第2ストライプ状パターン部
50 線状に延びる部分(帯状部分)
52 第1面
54 第2面
56 線状に延びる部分の幅方向の一端(左端)
58 線状に延びる部分の幅方向の他端(右端)
60 傾斜部
62 平坦部
70 コート層配置部
72 コート層非配置部
100,101,102 剥離ライナー
110 コート層付き剥離ライナー
120 剥離性支持体
120A 剥離性表面
Claims (44)
- フィルム状基材と、該フィルム状基材の少なくとも一方の表面上に設けられた粘着剤層と、を備える粘着シートであって、
前記粘着剤層の表面を部分的に覆うコート層をさらに備え、
前記粘着シートの接着面は、前記粘着剤層と前記コート層とによって構成されており、
前記コート層は、前記接着面の一端から他端に向かって線状に延びる部分を有しており、
前記線状に延びる部分は、前記粘着シートの接着面を構成する第1面と、該第1面に対して該粘着剤層側に位置する第2面と、を有しており、
前記線状に延びる部分の第2面は、該線状に延びる部分の長手方向に直交する断面において、全体としてなだらかな曲線で構成されている、粘着シート。 - 前記線状に延びる部分の第2面は、該線状に延びる部分の長手方向に直交する断面において、該線状に延びる部分の一端を起点として中央に向かうにつれて、なだらかな曲線で前記粘着剤層の深さ方向に延びる部分を有する、請求項1に記載の粘着シート。
- 前記線状に延びる部分の第2面は、該線状に延びる部分の長手方向に直交する断面において、該線状に延びる部分の一端から前記粘着剤層の深さ方向に延びる傾斜部と、該線状に延びる部分の最深部を含み且つ前記接着面にほぼ平行する平坦部と、を有する、請求項1または2に記載の粘着シート。
- 前記傾斜部は、前記粘着剤層側に凸に湾曲している、請求項3に記載の粘着シート。
- 前記線状に延びる部分は、その厚さTに対する幅Wの比(W/T)が50以上である、請求項1~4のいずれか一項に記載の粘着シート。
- 前記線状に延びる部分の幅は100μm以上である、請求項1~5のいずれか一項に記載の粘着シート。
- 前記粘着剤層は、該粘着剤層に含まれるポリマー成分の50重量%を超える割合でアクリル系ポリマーを含み、
前記アクリル系ポリマーは、モノマー成分として、式(1):
CH2=C(R1)COOR2 (1)
(上記式(1)中のR1は水素原子またはメチル基である。また、R2は炭素原子数1~20の鎖状アルキル基である。);で表されるアルキル(メタ)アクリレートを50重量%を超える割合で含む、請求項1~6のいずれか一項に記載の粘着シート。 - 前記アルキル(メタ)アクリレートは、n-ブチルアクリレートおよび/または2-エチルヘキシルアクリレートである、請求項7に記載の粘着シート。
- 前記アクリル系ポリマーは、副モノマーとしてカルボキシ基含有モノマーおよび/または水酸基含有モノマーが共重合されたアクリル系ポリマーである、請求項7または8に記載の粘着シート。
- 前記アクリル系ポリマーは、アクリル酸、メタクリル酸、2-ヒドロキシエチルアクリレートおよび4-ヒドロキシブチルアクリレートからなる群から選択される少なくとも1種の副モノマーが共重合されたアクリル系ポリマーである、請求項7~9のいずれか一項に記載の粘着シート。
- 前記アクリル系ポリマーには、カルボキシ基含有モノマーが共重合されており、前記カルボキシ基含有モノマーの共重合割合は、前記アクリル系ポリマーの合成に使用する全モノマー成分中、0.1~10重量%である、請求項7~10のいずれか一項に記載の粘着シート。
- 前記アクリル系ポリマーには水酸基含有モノマーが共重合されており、
前記水酸基含有モノマーの共重合割合は、前記アクリル系ポリマーの合成に使用する全モノマー成分中、0.001~10重量%である、請求項7~11のいずれか一項に記載の粘着シート。 - 前記粘着剤層は、イソシアネート系架橋剤および/またはエポキシ系架橋剤を含む、請求項7~12のいずれか一項に記載の粘着シート。
- 前記粘着剤層は、軟化点が100℃~140℃である粘着付与樹脂を、前記アクリル系ポリマー100重量部に対して30~60重量部の割合で含み、
前記粘着付与樹脂は、ロジン系粘着付与樹脂、テルペン系粘着付与樹脂および炭化水素系粘着付与樹脂からなる群から選択される少なくとも1種である、請求項7~13のいずれか一項に記載の粘着シート。 - 前記コート層は透明樹脂からなる、請求項1~14のいずれか一項に記載の粘着シート。
- 前記コート層は、ポリウレタン系樹脂、フェノール系樹脂、エポキシ系樹脂、ポリアミド系樹脂、尿素メラミン系樹脂、シリコーン系樹脂、ポリシラザン系樹脂、フッ素系樹脂、フェノキシ樹脂、メタクリル系樹脂、アクリル系樹脂、アクリル-ウレタン系樹脂、アクリル-スチレン系樹脂、ポリアリレート樹脂、ポリエステル系樹脂、ポリオレフィン系樹脂、ポリスチレン系樹脂、ポリ塩化ビニル、塩化ビニル-酢酸ビニル共重合体、ポリ酢酸ビニル、ポリ塩化ビニリデン、ポリカーボネート、セルロース類およびポリアセタールからなる群から選択される少なくとも1種の樹脂を含む、請求項1~15のいずれか一項に記載の粘着シート。
- 前記コート層はポリウレタン系樹脂である、請求項1~16のいずれか一項に記載の粘着シート。
- 前記コート層は、二液混合硬化型のポリウレタン系樹脂である、請求項1~17のいずれか一項に記載の粘着シート。
- 前記フィルム状基材は、ポリオレフィン系樹脂フィルム、ポリエステル系樹脂フィルム、塩化ビニル系樹脂フィルム、酢酸ビニル系樹脂フィルム、ポリイミド系樹脂フィルム、ポリアミド系樹脂フィルム、フッ素系樹脂フィルムまたはセロハンフィルムである、請求項1~18のいずれか一項に記載の粘着シート。
- 前記フィルム状基材はポリエステルフィルムである、請求項1~19のいずれか一項に記載の粘着シート。
- 前記フィルム状基材はポリエチレンテレフタレートフィルムである、請求項1~20のいずれか一項に記載の粘着シート。
- 前記フィルム状基材は80%以上の全光線透過率を示す、請求項1~21のいずれか一項に記載の粘着シート。
- 前記フィルム状基材は発泡体フィルムである、請求項1~18のいずれか一項に記載の粘着シート。
- 前記発泡体フィルムの平均気泡径は10~200μmであり、密度は0.01~0.7g/cm3である、請求項23に記載の粘着シート。
- 前記発泡体フィルムは、アクリル系樹脂発泡体またはポリオレフィン系樹脂発泡体である、請求項23または24に記載の粘着シート。
- 前記コート層の厚さは3μm未満である、請求項1~25のいずれか一項に記載の粘着シート。
- 携帯電子機器に用いられる、請求項1~26のいずれか一項に記載の粘着シート。
- 前記粘着剤層の厚さは20μm以下である、請求項1~27のいずれか一項に記載の粘着シート。
- 前記粘着剤層の厚さTAに対する前記コート層の厚さTCの比(TC/TA)は0.75以下である、請求項1~28のいずれか一項に記載の粘着シート。
- 前記粘着剤層として、前記フィルム状基材の第1表面上に設けられた第1粘着剤層と、前記フィルム状基材の第2表面上に設けられた第2粘着剤層と、を備え、
前記第1粘着剤層および第2粘着剤層の少なくとも一方の粘着剤層の表面に前記コート層が部分的に配置されている、請求項1~29のいずれか一項に記載の粘着シート。 - 前記フィルム状基材の厚さは5μm未満である、請求項1~30のいずれか一項に記載の粘着シート。
- 総厚さが50μm以下である、請求項1~31のいずれか一項に記載の粘着シート。
- 前記粘着剤層表面はコート層配置部とコート層非配置部とを有しており、
前記粘着剤層表面における前記コート層非配置部の面積割合は70%以上である、請求項1~32のいずれか一項に記載の粘着シート。 - 前記線状に延びる部分の幅は0.1~2mmの範囲内である、請求項33に記載の粘着シート。
- 前記粘着剤層表面には、前記線状に延びる部分が複数配置されており、
前記複数の線状に延びる部分のうち一群を構成する複数の線状に延びる部分は、その幅方向にて間隔をおいて配置されており、これによって、前記コート層配置部はストライプ状パターンを有する、請求項33または34に記載の粘着シート。 - 前記コート層配置部は、第1ストライプ状パターン部と、該第1ストライプ状パターン部と交差するように配置された第2ストライプ状パターン部とを含み、これによって、前記コート層配置部は格子状パターンを有する、請求項35に記載の粘着シート。
- 前記コート層配置部において、一のストライプ状パターンを構成する複数の線状に延びる部分の間隔は1.0~10mmの範囲内である、請求項35または36に記載の粘着シート。
- 前記コート層が部分的に配置された接着面は、13N/25mm以上の24時間経過後180度剥離強度を示す、請求項33~37のいずれか一項に記載の粘着シート。
- 請求項1~38のいずれか一項に記載の粘着シートと、該粘着シートの接着面を保護する剥離ライナーと、を備える、剥離ライナー付き粘着シート。
- 前記剥離ライナーの表面のうち前記接着面側の表面は、平滑に形成されている、請求項39に記載の剥離ライナー付き粘着シート。
- 少なくとも一方の表面が剥離性表面である剥離性支持体を備える粘着シート用剥離ライナーであって、
前記剥離性支持体の剥離性表面上には、粘着シートに転写可能なコート層が設けられており、
前記コート層は、前記剥離性表面の一端から他端に向かって線状に延びる部分を有しており、
前記線状に延びる部分は、前記剥離性表面側に位置する第1面と、該剥離性表面上において外表面を構成する第2面と、を有しており、
前記線状に延びる部分の第2面は、該線状に延びる部分の長手方向に直交する断面において、全体としてなだらかな曲線で構成されている、剥離ライナー。 - 前記コート層の厚さは3μm未満である、請求項41に記載の剥離ライナー。
- 剥離性支持体の剥離性表面上に粘着剤層を形成する工程と、フィルム状基材の表面に前記粘着剤層を転写する工程と、を含む、請求項1~38のいずれか一項に記載の粘着シートを製造する方法であって、
前記剥離性支持体の剥離性表面上にはコート層が部分的に形成されており、前記粘着剤層を形成する工程は、前記コート層が形成された前記剥離性表面上に粘着剤層をさらに形成する工程であるか;あるいは
前記剥離性支持体の剥離性表面上にはコート層が形成されておらず、前記粘着剤層を転写する工程の後、前記剥離性支持体を前記粘着剤層から除去し、
剥離性表面上にコート層が部分的に形成されたコート層形成剥離性支持体を用意し、前記コート層形成剥離性支持体を、該コート層が前記粘着剤層の表面に転写されるように該粘着剤層に重ねる;ことを特徴とする、製造方法。 - 剥離性支持体の剥離性表面上にコート層を部分的に形成する工程と;
前記コート層が形成された前記剥離性表面上に粘着剤層をさらに形成する工程と;
フィルム状基材の表面に前記粘着剤層を転写する工程と;
を含む、請求項1~38のいずれか一項に記載の粘着シートを製造する方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/529,624 US20170260425A1 (en) | 2014-11-28 | 2015-11-27 | Pressure-sensitive adhesive sheet |
CN201580064276.9A CN107001869B (zh) | 2014-11-28 | 2015-11-27 | 粘合片 |
KR1020177011804A KR102506413B1 (ko) | 2014-11-28 | 2015-11-27 | 점착 시트 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014-242183 | 2014-11-28 | ||
JP2014242183 | 2014-11-28 | ||
JP2015-164269 | 2015-08-21 | ||
JP2015164269A JP6664167B2 (ja) | 2014-11-28 | 2015-08-21 | 粘着シート |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016084947A1 true WO2016084947A1 (ja) | 2016-06-02 |
Family
ID=56074492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/083444 WO2016084947A1 (ja) | 2014-11-28 | 2015-11-27 | 粘着シート |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2016084947A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017200968A (ja) * | 2016-05-02 | 2017-11-09 | 日東電工株式会社 | 剥離ライナー付き粘着シート |
EP3666430A4 (en) * | 2017-08-10 | 2020-08-26 | Teraoka Seisakusho Co., Ltd. | ADHESIVE FOIL |
CN111876102A (zh) * | 2020-07-21 | 2020-11-03 | 中国乐凯集团有限公司 | 医用压敏胶组合物及其制备方法和胶粘材料 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04144798A (ja) * | 1990-10-05 | 1992-05-19 | Hideo Hamada | 転写シート |
JP2000044903A (ja) * | 1998-08-03 | 2000-02-15 | Toyo Ink Mfg Co Ltd | 粘着シート、その製造方法、およびその粘着力の調整方法 |
JP2000109763A (ja) * | 1998-10-01 | 2000-04-18 | Konishi Co Ltd | はく離紙を有する加工粘着テープとその製造方法 |
JP2000160117A (ja) * | 1998-09-21 | 2000-06-13 | Toyo Ink Mfg Co Ltd | 両面粘着シ―ト、その製造方法、およびその粘着力の調整方法 |
JP2001234130A (ja) * | 2000-02-25 | 2001-08-28 | Kuramoto Sangyo:Kk | 粘着シートおよびその製造方法 |
JP2003531253A (ja) * | 2000-04-24 | 2003-10-21 | エーブリー デニソン コーポレイション | 脱気が改善された接着物およびその接着物を製作する方法 |
JP2005298543A (ja) * | 2004-04-06 | 2005-10-27 | Kansai Paint Co Ltd | 粘着シート |
JP2010138260A (ja) * | 2008-12-11 | 2010-06-24 | Union Chemicar Co Ltd | 粘着層、透明粘着層を用いた機能性透明シートおよびインクジェット記録用透明シート |
-
2015
- 2015-11-27 WO PCT/JP2015/083444 patent/WO2016084947A1/ja active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04144798A (ja) * | 1990-10-05 | 1992-05-19 | Hideo Hamada | 転写シート |
JP2000044903A (ja) * | 1998-08-03 | 2000-02-15 | Toyo Ink Mfg Co Ltd | 粘着シート、その製造方法、およびその粘着力の調整方法 |
JP2000160117A (ja) * | 1998-09-21 | 2000-06-13 | Toyo Ink Mfg Co Ltd | 両面粘着シ―ト、その製造方法、およびその粘着力の調整方法 |
JP2000109763A (ja) * | 1998-10-01 | 2000-04-18 | Konishi Co Ltd | はく離紙を有する加工粘着テープとその製造方法 |
JP2001234130A (ja) * | 2000-02-25 | 2001-08-28 | Kuramoto Sangyo:Kk | 粘着シートおよびその製造方法 |
JP2003531253A (ja) * | 2000-04-24 | 2003-10-21 | エーブリー デニソン コーポレイション | 脱気が改善された接着物およびその接着物を製作する方法 |
JP2005298543A (ja) * | 2004-04-06 | 2005-10-27 | Kansai Paint Co Ltd | 粘着シート |
JP2010138260A (ja) * | 2008-12-11 | 2010-06-24 | Union Chemicar Co Ltd | 粘着層、透明粘着層を用いた機能性透明シートおよびインクジェット記録用透明シート |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017200968A (ja) * | 2016-05-02 | 2017-11-09 | 日東電工株式会社 | 剥離ライナー付き粘着シート |
WO2017191734A1 (ja) * | 2016-05-02 | 2017-11-09 | 日東電工株式会社 | 剥離ライナー付き粘着シート |
US11104826B2 (en) | 2016-05-02 | 2021-08-31 | Nitto Denko Corporation | Release-linered pressure-sensitive adhesive sheet |
EP3666430A4 (en) * | 2017-08-10 | 2020-08-26 | Teraoka Seisakusho Co., Ltd. | ADHESIVE FOIL |
US11781042B2 (en) | 2017-08-10 | 2023-10-10 | Teraoka Seisakusho Co., Ltd. | Adhesive sheet |
CN111876102A (zh) * | 2020-07-21 | 2020-11-03 | 中国乐凯集团有限公司 | 医用压敏胶组合物及其制备方法和胶粘材料 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6664167B2 (ja) | 粘着シート | |
JP6421019B2 (ja) | 積層シート | |
WO2017191734A1 (ja) | 剥離ライナー付き粘着シート | |
JP6574598B2 (ja) | 感圧接着シート | |
CN110691828B (zh) | 粘合片 | |
WO2016084948A1 (ja) | 粘着シート | |
WO2016084947A1 (ja) | 粘着シート | |
JP6778562B2 (ja) | 剥離ライナー付き粘着シート | |
WO2016084946A1 (ja) | 携帯電子機器用粘着シート |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15862994 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20177011804 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15529624 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 15862994 Country of ref document: EP Kind code of ref document: A1 |