WO2022210216A1 - 粘着テープ処理方法および粘着テープ処理装置 - Google Patents

粘着テープ処理方法および粘着テープ処理装置 Download PDF

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Publication number
WO2022210216A1
WO2022210216A1 PCT/JP2022/013731 JP2022013731W WO2022210216A1 WO 2022210216 A1 WO2022210216 A1 WO 2022210216A1 JP 2022013731 W JP2022013731 W JP 2022013731W WO 2022210216 A1 WO2022210216 A1 WO 2022210216A1
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WO
WIPO (PCT)
Prior art keywords
adhesive
adhesive tape
layer
polishing
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/013731
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English (en)
French (fr)
Japanese (ja)
Inventor
洋佑 山田
晃好 山本
隆之 野村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
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Nitto Denko Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Priority to US18/284,653 priority Critical patent/US20240191103A1/en
Priority to CN202280026173.3A priority patent/CN117120231A/zh
Priority to EP22780430.9A priority patent/EP4316732A1/en
Priority to JP2023511092A priority patent/JPWO2022210216A1/ja
Publication of WO2022210216A1 publication Critical patent/WO2022210216A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • 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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/007—Narrow strips, e.g. ribbons, tapes, bands
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/50—Additional features of adhesives in the form of films or foils characterized by process specific features
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present invention relates to an adhesive tape processing method and an adhesive tape processing apparatus.
  • Adhesive tapes are used in large quantities for affixing labels, etc. to goods and packaging materials, packing packaging materials, use in the manufacturing process of electronic and optical components, and masking applications. Particularly in recent years, the use of adhesive tapes in the manufacturing process of electronic members and optical members has increased, and a large amount of adhesive tape waste is generated at manufacturing sites and the like.
  • Adhesive tape waste is usually either burned and disposed of, or brought to a waste disposal site for disposal. However, from the viewpoint of reducing environmental load, such disposal is not preferable.
  • the acrylic adhesive contained in the adhesive tape a method has been reported in which the acrylic adhesive is separated by designing the composition of the adhesive to a specific composition.
  • the composition of the adhesive constituting the adhesive layer is alkoxyalkyl (meth)acrylate (7 to 30% by weight), caprolactone adduct of (meth)acrylic acid (1 to 15% by weight), carbon number A (meth)acrylic acid alkyl ester monomer having 4 to 18 alkyl groups (20 to 70% by weight), an ethylenically unsaturated carboxylic acid-containing monomer (7 to 20% by weight), a monomer copolymerizable therewith (1 to 15% by weight), and by making the pressure-sensitive adhesive of this specific composition, it is disaggregated with an aqueous solution of NaOH having a concentration of 18%.
  • Patent Document 2 A technology has been reported in which the adhesive is removed by saponifying the label adhesive, which is preferably removed during PET bottle recycling, with an alkaline aqueous solution (Patent Document 2).
  • a latent swelling component a random, block or graft copolymer containing 35 to 90% by weight of a lower alkyl ester of acrylic acid and/or maleic acid
  • an alkaline aqueous solution Alternatively, methanol or ethanol is added to it, and saponification treatment is performed to remove the adhesive.
  • the adhesive includes a heat-sensitive adhesive composition containing an acrylic acid ester copolymer as a polymer material, a thermal expansion agent, polyvinyl alcohol having a saponification degree of 95 mol% or more, and a cross-linking agent or curing agent. By containing the agent, the adhesive is self-peeling.
  • An adhesive tape processing method comprises: A method of treating an adhesive tape comprising a substrate layer and an adhesive layer, comprising: The base material layer has a storage modulus at 25° C. of 2 MPa or more, A step (I) of separating the adhesive constituting the adhesive layer from the base layer is included by polishing the surface of the adhesive layer of the adhesive tape.
  • the tension of the adhesive tape in step (I) is 0.1N to 1000N.
  • the adhesive tape processing method according to the embodiment of the present invention includes step (II) of removing the adhesive separated by the polishing.
  • the step (II) is at least one selected from a step of removing by air blow, a step of removing by spraying water, and a step of removing with a brush.
  • the adhesive tape processing method according to the embodiment of the present invention includes a plurality of steps (I) above.
  • the pressure-sensitive adhesive tape processing method is a double-sided pressure-sensitive adhesive tape in which the pressure-sensitive adhesive tape has the pressure-sensitive adhesive layer on both sides of the base layer, and the polishing in the step (I) is The surface of the pressure-sensitive adhesive layer on both sides is polished by.
  • the adhesive tape has a thickness of 10 ⁇ m to 600 ⁇ m.
  • the adhesive layer has a thickness of 3 ⁇ m to 300 ⁇ m.
  • the adhesive layer is composed of at least one selected from the group consisting of an acrylic adhesive, a urethane adhesive, a rubber adhesive, and a silicone adhesive.
  • An adhesive tape processing apparatus comprises: Feeding means for feeding an adhesive tape including a base layer and an adhesive layer, running means for running the adhesive tape, polishing means for polishing the adhesive layer of the adhesive tape, and the adhesive constituting the adhesive layer is separated. recovery means for recovering the remaining base material layer; including.
  • the polishing means is a power tool with a file.
  • the tension of the adhesive tape is 0.1N to 1000N when the adhesive layer is polished by the polishing means.
  • it includes removing means for removing the adhesive that constitutes the separated adhesive layer.
  • the removal means is at least one selected from removal by air blow, removal by spraying water, and removal by brush.
  • the adhesive tape processing apparatus includes a plurality of polishing means.
  • the adhesive tape is a double-sided adhesive tape having the adhesive layers on both sides of the base layer, and the adhesive tape is polished by the polishing means. The surface of the adhesive layer on both sides is polished.
  • an adhesive tape processing method that can easily separate the base material and adhesive that constitute the adhesive tape at low cost. Further, it is possible to provide an adhesive tape processing apparatus for use in such an adhesive tape processing method.
  • FIG. 1 is a schematic cross-sectional view of one embodiment of an adhesive tape to which an adhesive tape treatment method according to an embodiment of the invention can be applied;
  • FIG. FIG. 4 is a schematic cross-sectional view of another embodiment of an adhesive tape to which the adhesive tape processing method according to an embodiment of the present invention can be applied;
  • 1 is a process image diagram of one method of processing an adhesive tape according to an embodiment of the present invention;
  • FIG. FIG. 5 is another process image diagram of the adhesive tape processing method according to the embodiment of the present invention;
  • FIG. 5 is still another process image diagram of the adhesive tape processing method according to the embodiment of the present invention.
  • weight When the term “weight” is used in this specification, it may be read as “mass”, which is commonly used as an SI unit indicating weight.
  • (meth) acrylic when used in this specification, it means “acrylic and/or methacrylic", and when the expression “(meth) acrylate” is used, “acrylate and/or methacrylate ", and the expression “(meth)allyl” means “allyl and/or methallyl”, and the expression “(meth)acrolein” means “acrolein and/or methacrolein”. means rain.
  • a method for treating an adhesive tape according to an embodiment of the present invention is a method for treating an adhesive tape including a substrate layer and an adhesive layer, wherein the storage modulus of the substrate layer at 25° C. is 2 MPa or more, and the adhesive tape (I) of separating the adhesive constituting the adhesive layer from the substrate layer by polishing the surface of the adhesive layer.
  • the base material and the adhesive that constitute the adhesive tape can be easily separated at low cost.
  • polishing means grinding.
  • the adhesive tape processing method according to one embodiment of the present invention may include any other appropriate steps within the scope that does not impair the effects of the present invention.
  • the adhesive tape processing method includes step (II) of removing the adhesive separated by polishing in step (I) by blowing air.
  • the adhesive tape to be processed in the adhesive tape processing method according to the embodiment of the present invention is an adhesive tape including a base layer and an adhesive layer.
  • the adhesive tape to be treated may have any appropriate other layers as long as the adhesive tape includes a substrate layer and an adhesive layer, as long as the effects of the present invention are not impaired.
  • Such other layer may be one layer, or two or more layers.
  • an adhesive tape 100 consists of a base layer 10 and an adhesive layer 20, as shown in FIG.
  • One embodiment of the adhesive tape to be treated is, as shown in FIG. .
  • Step (I) is a step of separating the adhesive constituting the adhesive layer from the base layer by polishing the surface of the adhesive layer of the adhesive tape.
  • any appropriate polishing method can be adopted as a method for polishing the surface of the adhesive layer of the adhesive tape as long as the effects of the present invention are not impaired.
  • Examples of such a polishing method include a method using a belt sander equipped with a polishing belt, and a method of polishing with an electric tool (hand grinder, precision grinder, electric cutting tool, etc.) equipped with a file (paper, cloth, metal). mentioned.
  • a method using a belt sander equipped with a polishing belt can be mentioned in order to make the effect of the present invention more manifest. That is, the abrasive belt of a belt sander provided with an abrasive belt is brought into contact with the surface of the adhesive layer of the adhesive tape. In this case, the adhesive layer of the adhesive tape may be pressed against the abrasive belt, or the abrasive belt may be pressed against the adhesive layer of the adhesive tape. The surfaces of the layers may be brought into contact.
  • any appropriate belt sander can be adopted as the belt sander as long as it does not impair the effects of the present invention.
  • the belt speed of the belt sander is preferably 0.1 m/sec to 100 m/sec, more preferably 0.2 m/sec to 70 m/sec, and further It is preferably 0.5 m/sec to 50 m/sec, particularly preferably 1 m/sec to 30 m/sec.
  • Any appropriate abrasive belt can be adopted as the abrasive belt as long as it does not impair the effects of the present invention.
  • the particle size of the abrasive belt is preferably #20 to #2000, more preferably #24 to #1200, and still more preferably #30 to #1000, from the viewpoint that the effects of the present invention can be more expressed. , more preferably #40 to #800, more preferably #50 to #800, particularly preferably #60 to #800, and most preferably #80 to #800. If the particle size is too low outside the above range, the damage to the base material layer is large, and the recovery rate of the base material layer may decrease, or the base material layer may be broken. The tension of the adhesive tape must be kept low. If the particle size is too high outside the above range, it may take too long to perform the necessary polishing.
  • Any appropriate belt width can be adopted as the belt width of the polishing belt as long as the effects of the present invention are not impaired.
  • the tension of the pressure-sensitive adhesive tape when polishing the surface of the pressure-sensitive adhesive layer is preferably 0.1N to 1000N, more preferably 1N to 900N, still more preferably 1N to 900N, more preferably 3N to 800N, more preferably 5N to 700N, more preferably 5N to 600N, still more preferably 5N to 500N, still more preferably 5N to 400N, still more preferably 5N to 300N , particularly preferably 5N to 200N, most preferably 5N to 100N. If the tension of the adhesive tape when polishing the surface of the adhesive layer is too low outside the above range, the polishing belt and the adhesive layer do not come into proper contact with each other, resulting in uneven polishing, resulting in ineffective polishing. It may not be possible.
  • tension control means for adjusting the tension within the above tension range known tension control means such as a method of controlling the force of pressing the abrasive belt against the adhesive tape, a method of controlling by changing the speed ratio of the rollers, etc. It may be selected as appropriate and is not particularly limited.
  • the adhesive tape processing method preferably includes step (II) of removing the adhesive separated by polishing in step (I).
  • step (II) of removing the adhesive separated by polishing in step (I).
  • step (II) any appropriate method can be adopted as long as the adhesive separated by polishing in step (I) can be removed without impairing the effects of the present invention.
  • a method of blowing off the separated adhesive by blowing gas a wet removal method of removing by spraying liquid, and a mechanical removal method such as friction with a brush.
  • a step of removing by air blow a step of removing by spraying water, and a step of removing by brush.
  • the adhesive tape processing method according to the embodiment of the present invention may include a step (III) of recovering the adhesive separated by polishing in the step (I) and the removal material from which the adhesive has been removed. Any appropriate method can be adopted as such a recovery method as long as the effects of the present invention are not impaired. Examples of such collection methods include a dust collector using static electricity and a dust collector using suction force.
  • the adhesive tape processing method whether or not the adhesive constituting the adhesive layer is separated from the adhesive tape, and the degree of separation is confirmed by IR measurement (infrared spectroscopic measurement). be able to. Since the adhesive has a component corresponding to its type, whether or not the IR spectrum peculiar to the component can be seen, and by quantitative calculation based on the intensity of the IR spectrum, the adhesive constituting the adhesive layer is tacky. It is possible to confirm whether or not the tape is separated from the tape, and the degree of separation.
  • IR measurement infrared spectroscopic measurement
  • FIG. 3 is one preferred process image diagram of the adhesive tape processing method according to the embodiment of the present invention.
  • the pressure-sensitive adhesive tape 100 having the separator 30 on the surface of the pressure-sensitive adhesive layer 20 is unwound from the roll body 1 while the separator 30 is wound up by the separator winding roll 2 (unwinding means).
  • the unwound adhesive tape 100 runs (running means) and is conveyed so that the adhesive layer 20 is pressed against the abrasive belt of a belt sander 1000 having an abrasive belt, and the adhesive layer 20 is ground by the abrasive belt.
  • Step (I) polishing means).
  • the adhesive layer 20 is abraded by the abrasive belt, whereby the adhesive 20 ′ constituting the adhesive layer 20 is separated from the base material layer 10 . Since the separated adhesive 20' is likely to re-adhere to the adhesive tape 100, the base material layer 10, the abrasive belt, etc., as shown in FIG. , 2001, 2002). After that, the remaining base material layer 10 is recovered by being wound up by the roll 3 (recovery means). Examples of the removing means include at least one selected from removal by air blow, removal by spraying water, and removal by brush.
  • FIG. 4 is another preferred process image diagram of the adhesive tape processing method according to the embodiment of the present invention.
  • the embodiment shown in FIG. 4 is an embodiment including a plurality of steps (I) in the adhesive tape processing method according to the embodiment of the present invention.
  • the pressure-sensitive adhesive tape 100 having the separator 30 on the surface of the pressure-sensitive adhesive layer 20 is unwound from the roll body 1 while the separator 30 is wound up by the separator winding roll 2 (unwinding means).
  • the unwound adhesive tape 100 travels (running means) and is conveyed so that the adhesive layer 20 is pressed against the abrasive belt of a belt sander 1000a equipped with an abrasive belt, and the adhesive layer 20 is polished by the abrasive belt.
  • Step (Ia) polishing means a
  • the adhesive layer 20 is abraded by the abrasive belt, whereby the adhesive 20 ′ constituting the adhesive layer 20 is separated from the base material layer 10 . Since the separated adhesive 20' is likely to re-adhere to the adhesive tape 100, the base material layer 10, the abrasive belt, etc., as shown in FIG. , 2001, 2002) (removal means).
  • the base material layer 10 (with the adhesive layer 20 remaining thereon) is further run. Then (traveling means), the adhesive layer 20 is conveyed so as to be pressed against the abrasive belt of a belt sander 1000b equipped with an abrasive belt, and the remaining adhesive layer 20 is polished by the abrasive belt (step ( Ib)) (polishing means b). By polishing the remaining adhesive layer 20 with the abrasive belt in this way, the adhesive 20 ′ constituting the remaining adhesive layer 20 is separated from the base layer 10 .
  • the removing means include at least one selected from removal by air blow, removal by spraying water, and removal by brush.
  • the grain size of the polishing belt used in the plurality of steps (I) is increased in order along the flow of the process (the grain size number is increased). : finely) is preferable.
  • the grain size of the polishing belt of the belt sander 1000b is larger than the grain size of the polishing belt of the belt sander 1000a (for example, the grain size of the polishing belt of the belt sander 1000a is #100, and the grain size of the polishing belt of the belt sander 1000b is The particle size is #600).
  • FIG. 5 is yet another preferred process image diagram of the adhesive tape processing method according to the embodiment of the present invention.
  • the embodiment shown in FIG. 5 is an adhesive tape processing method according to an embodiment of the present invention, wherein the adhesive tape is a double-sided adhesive tape having an adhesive layer on both sides of a base layer, and the both sides are bonded by polishing in step (I). is an embodiment in which the surface of the pressure-sensitive adhesive layer is polished.
  • a double-sided adhesive tape 100 having a pressure-sensitive adhesive layer 20a and a pressure-sensitive adhesive layer 20b on both sides of a base material layer 10, and a separator 30 provided on the surface of the pressure-sensitive adhesive layer 20a to form a roll body 1.
  • the separator 30 is unwound from the roll body 1 while being wound up by the separator winding roll 2 (unwinding means).
  • the unwound adhesive tape 100 travels (running means), and the adhesive layer 20b is attached to the belt sander 1000b provided with the abrasive belt so that the adhesive layer 20a is pressed against the abrasive belt of the belt sander 1000a provided with the abrasive belt.
  • the adhesive layer 20a and the adhesive layer 20b are polished by the polishing belt (step (I)) (polishing means).
  • the adhesive layer 20a and the adhesive layer 20b are polished by the polishing belt, so that the adhesive 20a′ constituting the adhesive layer 20a and the adhesive 20b′ constituting the adhesive layer 20b become the base layer. 10. Since the separated adhesive 20a' and adhesive 20b' are likely to re-adhere to the adhesive tape 100, the base material layer 10, the abrasive belt, etc., as shown in FIG. 2001, 2002, 2003). After that, the remaining base material layer 10 is recovered by being wound up by the roll 3 (recovery means). Examples of the removing means include at least one selected from removal by air blow, removal by spraying water, and removal by brush.
  • the adhesive tape processing method includes an embodiment including a plurality of steps (I) as shown in FIG.
  • a double-sided pressure-sensitive adhesive tape having a double-sided pressure-sensitive adhesive tape may be combined with an embodiment in which the surfaces of the pressure-sensitive adhesive layers on both sides are polished by polishing in step (I).
  • An adhesive tape processing apparatus is a processing apparatus used in an adhesive tape processing method according to an embodiment of the present invention, and includes a base layer and an adhesive layer as in the embodiment described with reference to FIG. Feeding means for feeding the adhesive tape, running means for running the adhesive tape, polishing means for polishing the adhesive layer of the adhesive tape, and recovering the base layer remaining after the adhesive constituting the adhesive layer is separated. and means for recovery. Also, as in the embodiment described with reference to FIG. 4, the adhesive tape processing apparatus according to the embodiment of the present invention may include a plurality of polishing means. Further, as in the embodiment described with reference to FIG.
  • the adhesive tape processing apparatus is characterized in that the adhesive tape is a double-sided adhesive tape having an adhesive layer on both sides of a base material layer, and the polishing means is a polishing means. It may be an embodiment in which the surfaces of the pressure-sensitive adhesive layers on both sides are polished. Further, the adhesive tape processing apparatus according to the embodiment of the present invention includes an embodiment including a plurality of polishing means, and the adhesive tape is a double-sided adhesive tape having an adhesive layer on both sides of a base layer, and the polishing means is a double-sided adhesive tape. It may be an embodiment combined with an embodiment in which the surfaces of the pressure-sensitive adhesive layers on both sides are polished by.
  • the adhesive tape processing apparatus may include removing means for removing the adhesive constituting the separated adhesive layer.
  • the removing means any appropriate method can be adopted as long as it is a method capable of removing the separated pressure-sensitive adhesive within a range that does not impair the effects of the present invention. Examples of such a method include a method of blowing off the separated adhesive by blowing gas, a wet removal method of removing by spraying liquid, and a mechanical removal method such as friction with a brush. For example, at least one selected from removal by air blow, removal by spraying water, and removal by brush.
  • polishing means examples include a belt sander equipped with a polishing belt, and an electric tool (hand grinder, precision grinder, electric cutting tool, etc.) equipped with a file (paper, cloth, metal).
  • the tension of the adhesive tape when the adhesive layer is polished by the polishing means is preferably 0.1N to 1000N, more preferably 1N. ⁇ 900N, more preferably 3N to 800N, more preferably 5N to 700N, still more preferably 5N to 600N, still more preferably 5N to 500N, still more preferably 5N to 400N, More preferably 5N to 300N, particularly preferably 5N to 200N, most preferably 5N to 100N. If the tension of the pressure-sensitive adhesive tape is too low, the polishing belt and the pressure-sensitive adhesive layer do not come into proper contact with each other, resulting in uneven polishing, which may hinder effective polishing.
  • tension control means for adjusting the tension within the above tension range known tension control means such as a method of controlling the force of pressing the abrasive belt against the adhesive tape, a method of controlling by changing the speed ratio of the rollers, etc. It may be selected as appropriate and is not particularly limited.
  • One embodiment of the adhesive tape processing apparatus includes removing means for removing the adhesive constituting the separated adhesive layer, as described with reference to FIG.
  • the adhesive tape to be treated in the adhesive tape treatment method according to the embodiment of the present invention is an adhesive tape including a base material layer and an adhesive layer.
  • the adhesive tape to be treated may have any appropriate other layers as long as the adhesive tape includes a substrate layer and an adhesive layer, as long as the effects of the present invention are not impaired.
  • Such other layer may be one layer, or two or more layers.
  • Such other layers include, for example, an antistatic layer and a printing layer.
  • any suitable thickness can be adopted as the thickness of the adhesive tape to be processed as long as the effects of the present invention are not impaired.
  • Such thickness is preferably 10 ⁇ m to 600 ⁇ m, more preferably 20 ⁇ m to 500 ⁇ m, still more preferably 25 ⁇ m to 350 ⁇ m, and particularly preferably 30 ⁇ m to 250 ⁇ m.
  • the storage modulus of the substrate layer at 25° C. is preferably 2 MPa or more, more preferably 5 MPa or more, even more preferably 7 MPa or more, and particularly preferably 10 MPa or more.
  • the upper limit of the storage modulus at 25° C. is preferably 100,000 MPa or less, more preferably 80,000 MPa or less, still more preferably 70,000 MPa or less, and particularly preferably 10,000 MPa or less, from the viewpoint of handleability and the like.
  • the storage elastic modulus of the base material layer at 25° C. is out of the above range and too low, the adhesive tape may break when the surface of the adhesive layer of the adhesive tape is polished. If the storage elastic modulus of the substrate layer at 25° C. is out of the above range and is too high, the abrasive often falls off when it comes into contact with the substrate layer, shortening the life of the abrasive belt and reducing the economy. There is a risk that the performance will decrease.
  • a base layer formed from any suitable material can be adopted as long as the effects of the present invention are not impaired.
  • suitable materials include plastic films, nonwoven fabrics, paper, metal foils, woven fabrics, rubber sheets, foam sheets, laminates thereof (especially laminates containing plastic films), and the like.
  • plastic films include plastic films made of polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT); polyethylene (PE), polypropylene (PP), polymethyl Plastic film composed of olefin-based resins whose monomer components are ⁇ -olefins such as pentene (PMP), ethylene-propylene copolymer, ethylene-vinyl acetate copolymer (EVA); composed of polyvinyl chloride (PVC) plastic film made of vinyl acetate resin; plastic film made of polycarbonate (PC); plastic film made of polyphenylene sulfide (PPS); polyamide (nylon), wholly aromatic polyamide (aramid ) plastic film composed of amide-based resin such as; plastic film composed of polyimide-based resin; plastic film composed of polyetheretherketone (PEEK); olefin-based resin such as polyethylene (PE) and polypropylene (PP) Plastic films composed of
  • non-woven fabrics include non-woven fabrics made of heat-resistant natural fibers such as non-woven fabrics containing manila hemp; synthetic resin non-woven fabrics such as polypropylene resin non-woven fabrics, polyethylene resin non-woven fabrics, and ester resin non-woven fabrics;
  • the base material layer may consist of only one layer, or may consist of two or more layers.
  • any appropriate thickness can be adopted as the thickness of the base material layer as long as the effects of the present invention are not impaired.
  • Such thickness is preferably 7 ⁇ m to 300 ⁇ m, more preferably 10 ⁇ m to 250 ⁇ m, still more preferably 15 ⁇ m to 200 ⁇ m, and particularly preferably 20 ⁇ m to 150 ⁇ m.
  • the base layer may be surface-treated.
  • surface treatment include corona treatment, plasma treatment, chromic acid treatment, ozone exposure, flame exposure, high voltage shock exposure, ionizing radiation treatment, and coating treatment with a primer.
  • the back surface of the base material layer may be treated.
  • the base layer may have an antistatic layer on the back.
  • the base layer may be subjected to antistatic treatment.
  • the substrate layer may be processed for printing.
  • the base layer may contain any other appropriate additive within a range that does not impair the effects of the present invention.
  • any suitable adhesive layer can be adopted as long as the effects of the present invention are not impaired.
  • the pressure-sensitive adhesive layer may consist of only one layer, or may consist of two or more layers.
  • any suitable thickness can be adopted as the thickness of the pressure-sensitive adhesive layer as long as the effects of the present invention are not impaired.
  • Such thickness is preferably 3 ⁇ m to 300 ⁇ m, more preferably 10 ⁇ m to 250 ⁇ m, still more preferably 10 ⁇ m to 150 ⁇ m, and particularly preferably 10 ⁇ m to 100 ⁇ m.
  • the adhesive layer is preferably composed of at least one selected from the group consisting of acrylic adhesives, urethane adhesives, rubber adhesives, and silicone adhesives.
  • the adhesive layer can be formed by any appropriate method.
  • a method for example, at least one selected from the group consisting of an adhesive composition (acrylic adhesive composition, urethane adhesive composition, rubber adhesive composition, silicone adhesive composition ) is applied onto any suitable substrate, heated and dried as necessary, and cured as necessary to form a pressure-sensitive adhesive layer on the substrate.
  • coating methods include gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, air knife coater, spray coater, comma coater, direct coater, roll brush coater, A method such as a curtain coater can be used.
  • An acrylic pressure-sensitive adhesive is formed from an acrylic pressure-sensitive adhesive composition.
  • the acrylic pressure-sensitive adhesive composition preferably contains an acrylic polymer and a cross-linking agent from the viewpoint that the effects of the present invention can be expressed more effectively.
  • the acrylic polymer can be called a so-called base polymer in the field of acrylic adhesives. Only one type of acrylic polymer may be used, or two or more types may be used.
  • the content of the acrylic polymer in the acrylic pressure-sensitive adhesive composition is preferably 50% to 100% by weight, more preferably 60% to 100% by weight, and still more preferably 70% by weight in terms of solid content. % to 100% by weight, particularly preferably 80% to 100% by weight, most preferably 90% to 100% by weight.
  • Any appropriate acrylic polymer can be adopted as the acrylic polymer as long as it does not impair the effects of the present invention.
  • the weight-average molecular weight of the acrylic polymer is preferably from 100,000 to 3,000,000, more preferably from 150,000 to 2,000,000, from the viewpoint that the effects of the present invention can be exhibited more, More preferably 200,000 to 1,500,000, and particularly preferably 250,000 to 1,000,000.
  • the acrylic polymer is preferably (component a) an alkyl (meth)acrylate having 4 to 12 carbon atoms in the alkyl group of the alkyl ester moiety, (b Component) An acrylic polymer formed by polymerization from a composition (A) containing at least one member selected from the group consisting of (meth)acrylic acid esters having an OH group and (meth)acrylic acid.
  • Component a) and (Component b) may each independently be one kind or two or more kinds.
  • Examples of the (meth)acrylic acid alkyl ester (component a) in which the alkyl group of the alkyl ester moiety has 4 to 12 carbon atoms include n-butyl (meth)acrylate, isobutyl (meth)acrylate, and (meth)acrylate.
  • s-butyl acrylate t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-(meth)acrylate Ethylhexyl, isooctyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate etc.
  • n-butyl (meth)acrylate and 2-ethylhexyl (meth)acrylate are preferred, and n-butyl acrylate and acrylic are more preferred, in that the effects of the present invention can be more expressed.
  • At least one (component b) selected from the group consisting of (meth)acrylic acid esters having an OH group and (meth)acrylic acid includes, for example, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, Examples thereof include (meth)acrylic acid esters having an OH group such as hydroxybutyl (meth)acrylate, and (meth)acrylic acid.
  • hydroxyethyl (meth)acrylate and (meth)acrylic acid are preferred, and hydroxyethyl acrylate and acrylic acid are more preferred, from the viewpoint that the effects of the present invention can be exhibited more.
  • the composition (A) may contain copolymerizable monomers other than the components (a) and (b).
  • the number of copolymerizable monomers may be one, or two or more.
  • Such copolymerizable monomers include, for example, itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, acid anhydrides thereof (for example, acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride).
  • a polyfunctional monomer can also be employed as a copolymerizable monomer.
  • a polyfunctional monomer refers to a monomer having two or more ethylenically unsaturated groups in one molecule.
  • any suitable ethylenically unsaturated group can be adopted as long as the effects of the present invention are not impaired.
  • Such ethylenically unsaturated groups include, for example, radically polymerizable functional groups such as vinyl groups, propenyl groups, isopropenyl groups, vinyl ether groups (vinyloxy groups), and allyl ether groups (allyloxy groups).
  • polyfunctional monomers examples include hexanediol di(meth)acrylate, butanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, (poly)propylene glycol di(meth)acrylate, and neopentyl glycol.
  • (Meth)acrylic acid alkoxyalkyl esters may also be employed as copolymerizable monomers.
  • Examples of (meth)acrylic acid alkoxyalkyl esters include 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, and 3-(meth)acrylate. methoxypropyl, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, 4-ethoxybutyl (meth)acrylate and the like.
  • the (meth)acrylic acid alkoxyalkyl ester may be used alone or in combination of two or more.
  • the content of the (meth)acrylic acid alkyl ester (ingredient a) in which the alkyl group of the alkyl ester portion has 4 to 12 carbon atoms is the monomer constituting the acrylic polymer in that the effect of the present invention can be expressed more.
  • the total amount of components (100% by weight) it is preferably 50% by weight or more, more preferably 60% by weight to 100% by weight, still more preferably 70% by weight to 100% by weight, particularly preferably 80% by weight. % to 100% by weight.
  • the content of at least one (component b) selected from the group consisting of (meth)acrylic acid esters having an OH group and (meth)acrylic acid is such that the effects of the present invention can be more expressed, and the acrylic polymer is It is preferably 0.1% by weight or more, more preferably 1.0% to 50% by weight, still more preferably 1.5% to 40% by weight, based on the total amount (100% by weight) of the constituent monomer components. % by weight, particularly preferably 2.0% to 30% by weight.
  • composition (A) may contain any appropriate other component within a range that does not impair the effects of the present invention.
  • Such other components include, for example, polymerization initiators, chain transfer agents, solvents and the like. Any appropriate content can be adopted as the content of these other components as long as the effects of the present invention are not impaired.
  • a thermal polymerization initiator or a photopolymerization initiator can be used as the polymerization initiator. Only one polymerization initiator may be used, or two or more polymerization initiators may be used.
  • a thermal polymerization initiator can preferably be employed when obtaining an acrylic polymer by solution polymerization.
  • thermal polymerization initiators include azo polymerization initiators, peroxide polymerization initiators (eg, dibenzoyl peroxide, tert-butyl permaleate, etc.), redox polymerization initiators, and the like.
  • the azo initiators disclosed in JP-A-2002-69411 are particularly preferred.
  • Such an azo polymerization initiator is preferable in that the decomposition product of the polymerization initiator is less likely to remain in the acrylic polymer as a portion that causes the generation of heat-generated gas (outgas).
  • azo polymerization initiator 2,2'-azobisisobutyronitrile (hereinafter sometimes referred to as AIBN), 2,2'-azobis-2-methylbutyronitrile (hereinafter referred to as AMBN) ), 2,2′-azobis(2-methylpropionate)dimethyl, 4,4′-azobis-4-cyanovaleric acid, and the like.
  • AIBN 2,2'-azobisisobutyronitrile
  • AMBN 2,2'-azobis-2-methylbutyronitrile
  • 2,2′-azobis(2-methylpropionate)dimethyl 4,4′-azobis-4-cyanovaleric acid
  • the amount of the azo polymerization initiator used is preferably 0.01 to 5.0 parts by weight, more preferably 0.05 parts by weight, relative to the total amount (100 parts by weight) of the monomer components constituting the acrylic polymer. 0.15 to 3.0 parts by weight, most preferably 0.1 to 3.0 parts by weight, more preferably 0.1 to 3.0 parts by weight. 20 parts by
  • a photopolymerization initiator can preferably be employed when obtaining an acrylic polymer by active energy ray polymerization.
  • photopolymerization initiators include benzoin ether-based photopolymerization initiators, acetophenone-based photopolymerization initiators, ⁇ -ketol-based photopolymerization initiators, aromatic sulfonyl chloride-based photopolymerization initiators, and photoactive oxime-based photopolymerization initiators.
  • benzoin-based photopolymerization initiators benzyl-based photopolymerization initiators, benzophenone-based photopolymerization initiators, ketal-based photopolymerization initiators, thioxanthone-based photopolymerization initiators, and the like.
  • benzoin ether-based photopolymerization initiators examples include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethan-1-one, and anisole. and methyl ether.
  • Acetophenone-based photopolymerization initiators include, for example, 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylphenylketone, 4-phenoxydichloroacetophenone, and 4-(t-butyl). and dichloroacetophenone.
  • Examples of ⁇ -ketol photopolymerization initiators include 2-methyl-2-hydroxypropiophenone, 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropan-1-one, and the like.
  • Examples of aromatic sulfonyl chloride photopolymerization initiators include 2-naphthalenesulfonyl chloride.
  • Examples of photoactive oxime-based photopolymerization initiators include 1-phenyl-1,1-propanedione-2-(o-ethoxycarbonyl)-oxime.
  • Benzoin-based photopolymerization initiators include, for example, benzoin.
  • Examples of benzyl-based photopolymerization initiators include benzyl.
  • benzophenone-based photopolymerization initiators examples include benzophenone, benzoylbenzoic acid, 3,3′-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, ⁇ -hydroxycyclohexylphenylketone, and the like.
  • ketal-based photopolymerization initiators examples include benzyl dimethyl ketal.
  • Thioxanthone-based photopolymerization initiators include, for example, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, and dodecylthioxanthone.
  • the amount of the photopolymerization initiator used is preferably 0.01 to 3.0 parts by weight, more preferably 0.015 parts by weight, relative to the total amount (100 parts by weight) of the monomer components constituting the acrylic polymer. parts to 2.0 parts by weight, more preferably 0.02 parts to 1.5 parts by weight, particularly preferably 0.025 parts to 1.0 parts by weight, most preferably 0.03 parts by weight. parts by weight to 0.50 parts by weight.
  • the acrylic pressure-sensitive adhesive composition may contain a cross-linking agent.
  • a cross-linking agent By using a cross-linking agent, the cohesive force of the acrylic pressure-sensitive adhesive can be improved, and the effects of the present invention can be exhibited more.
  • the number of cross-linking agents may be one, or two or more.
  • cross-linking agents examples include polyfunctional isocyanate-based cross-linking agents, epoxy-based cross-linking agents, melamine-based cross-linking agents, peroxide-based cross-linking agents, urea-based cross-linking agents, metal alkoxide cross-linking agents, metal chelate-based cross-linking agents, and metal salts.
  • cross-linking agents carbodiimide-based cross-linking agents, oxazoline-based cross-linking agents, aziridine-based cross-linking agents, amine-based cross-linking agents, and the like.
  • at least one (component c) selected from the group consisting of polyfunctional isocyanate-based cross-linking agents and epoxy-based cross-linking agents is preferable in that the effects of the present invention can be exhibited more effectively.
  • Polyfunctional isocyanate-based cross-linking agents include, for example, lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate; cyclopentylene diisocyanate, cyclohexylene diisocyanate, Alicyclic polyisocyanates such as isophorone diisocyanate, hydrogenated tolylene diisocyanate and hydrogenated xylene diisocyanate; 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, xylylene diisocyanate and aromatic polyisocyanates.
  • lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate
  • Polyfunctional isocyanate-based cross-linking agents include, for example, trimethylolpropane/tolylene diisocyanate adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate L”), trimethylolpropane/hexamethylene diisocyanate adduct (Nippon Polyurethane Industry Co., Ltd. company, trade name "Coronate HL”), trade name "Coronate HX” (Nippon Polyurethane Industry Co., Ltd.), trimethylolpropane/xylylene diisocyanate adduct (manufactured by Mitsui Chemicals, trade name "Takenate 110N”), etc. A commercial item is also mentioned.
  • epoxy-based cross-linking agents include N,N,N',N'-tetraglycidyl-m-xylenediamine, diglycidylaniline, 1,3-bis(N,N-diglycidylamino methyl)cyclohexane, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyglycidyl ether,
  • any appropriate content can be adopted for the content of the cross-linking agent in the acrylic pressure-sensitive adhesive composition, as long as the effects of the present invention are not impaired.
  • a content is, for example, preferably 0.1 parts by weight to 5.0 parts by weight with respect to the solid content (100 parts by weight) of the acrylic polymer in terms of more expressing the effects of the present invention. , more preferably 0.2 parts by weight to 4.5 parts by weight, still more preferably 0.3 parts by weight to 4.0 parts by weight, particularly preferably 0.4 parts by weight to 3.5 parts by weight Department.
  • the acrylic pressure-sensitive adhesive composition may contain any appropriate other component within a range that does not impair the effects of the present invention.
  • Such other components include, for example, polymer components other than acrylic polymers, cross-linking accelerators, cross-linking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), Antiaging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foils, UV absorbers, antioxidants, light stabilizers, chain transfer agents, plasticizers, softeners, Surfactants, antistatic agents, conductive agents, stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts and the like.
  • a urethane-based pressure-sensitive adhesive is formed from a urethane-based pressure-sensitive adhesive composition.
  • the urethane-based pressure-sensitive adhesive composition preferably contains at least one selected from the group consisting of urethane prepolymers and polyols, and a cross-linking agent, in order to make the effects of the present invention more manifest.
  • At least one selected from the group consisting of urethane prepolymers and polyols can be called a so-called base polymer in the field of urethane pressure-sensitive adhesives. Only one type of urethane prepolymer may be used, or two or more types may be used. Only one kind of polyol may be used, or two or more kinds thereof may be used.
  • the urethane prepolymer is preferably a polyurethane polyol, more preferably polyester polyol (a1) or polyether polyol (a2), each alone or in a mixture of (a1) and (a2) in the presence of a catalyst. It is obtained by reacting with an organic polyisocyanate compound (a3) under or without a catalyst.
  • polyester polyol Any appropriate polyester polyol can be used as the polyester polyol (a1).
  • polyester polyols (a1) include polyester polyols obtained by reacting an acid component and a glycol component.
  • acid components include terephthalic acid, adipic acid, azelaic acid, sebacic acid, phthalic anhydride, isophthalic acid, and trimellitic acid.
  • glycol components include ethylene glycol, propylene glycol, diethylene glycol, butylene glycol, 1,6-hexane glycol, 3-methyl-1,5-pentanediol, 3,3′-dimethylolheptane, polyoxyethylene glycol, Examples include polyoxypropylene glycol, 1,4-butanediol, neopentyl glycol, butylethylpentanediol, and polyol components such as glycerin, trimethylolpropane, and pentaerythritol.
  • Polyester polyols (a1) also include polyester polyols obtained by ring-opening polymerization of lactones such as polycaprolactone, poly( ⁇ -methyl- ⁇ -valerolactone) and polyvalerolactone.
  • the molecular weight of the polyester polyol (a1) can range from low molecular weight to high molecular weight.
  • the number average molecular weight is preferably 100 to 100,000 from the viewpoint that the effects of the present invention can be exhibited more effectively. If the number average molecular weight is less than 100, the reactivity becomes high and gelation may easily occur. If the number average molecular weight exceeds 100,000, the reactivity may become low, and furthermore, the cohesive strength of the polyurethane polyol itself may become small.
  • the amount of the polyester polyol (a1) to be used is preferably 0 mol % to 90 mol % of the polyols constituting the polyurethane polyol, from the point of view that the effects of the present invention can be exhibited more effectively.
  • any appropriate polyether polyol can be used as the polyether polyol (a2).
  • examples of such polyether polyols (a2) include water, propylene glycol, ethylene glycol, glycerin, trimethylolpropane, and other low-molecular-weight polyols as initiators, and ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, and the like.
  • Examples include polyether polyols obtained by polymerizing oxirane compounds.
  • Specific examples of such polyether polyols (a2) include polyether polyols having two or more functional groups, such as polypropylene glycol, polyethylene glycol, and polytetramethylene glycol.
  • the molecular weight of the polyether polyol (a2) can range from low molecular weight to high molecular weight.
  • the number average molecular weight is preferably 100 to 100,000 from the viewpoint that the effects of the present invention can be exhibited more. If the number average molecular weight is less than 100, the reactivity becomes high and gelation may easily occur. If the number average molecular weight exceeds 100,000, the reactivity may become low, and furthermore, the cohesive strength of the polyurethane polyol itself may become small.
  • the amount of the polyether polyol (a2) to be used is preferably 0 mol % to 90 mol % of the polyols constituting the polyurethane polyol, from the point of view that the effects of the present invention can be exhibited more effectively.
  • polyether polyol (a2) Part of the polyether polyol (a2), if necessary, glycols such as ethylene glycol, 1,4-butanediol, neopentyl glycol, butylethylpentanediol, glycerin, trimethylolpropane, pentaerythritol, It can be used in combination with polyvalent amines such as ethylenediamine, N-aminoethylethanolamine, isophoronediamine, xylylenediamine, and the like.
  • glycols such as ethylene glycol, 1,4-butanediol, neopentyl glycol, butylethylpentanediol, glycerin, trimethylolpropane, pentaerythritol
  • polyvalent amines such as ethylenediamine, N-aminoethylethanolamine, isophoronediamine, xy
  • polyether polyol (a2) only a bifunctional polyether polyol may be used, or a polyether having a number average molecular weight of 100 to 100,000 and at least 3 or more hydroxyl groups in one molecule. Part or all of the polyol may be used.
  • polyether polyol (a2) when a polyether polyol having a number average molecular weight of 100 to 100,000 and having at least 3 or more hydroxyl groups in one molecule is used in whole or in part, the effects of the present invention are further exhibited. In addition, the balance between adhesive strength and releasability can be improved.
  • the number average molecular weight of such a polyether polyol is less than 100, the reactivity becomes high and there is a possibility that gelation is likely to occur. Moreover, in such a polyether polyol, if the number average molecular weight exceeds 100,000, the reactivity may be lowered, and the cohesive strength of the polyurethane polyol itself may be lowered.
  • the number average molecular weight of such a polyether polyol is more preferably 100 to 10,000 in terms of making the effects of the present invention more manifest.
  • organic polyisocyanate compound (a3) Any appropriate organic polyisocyanate compound can be used as the organic polyisocyanate compound (a3).
  • organic polyisocyanate compounds (a3) include aromatic polyisocyanates, aliphatic polyisocyanates, araliphatic polyisocyanates, and alicyclic polyisocyanates.
  • aromatic polyisocyanates examples include 1,3-phenylene diisocyanate, 4,4'-diphenyldiisocyanate, 1,4-phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6 - tolylene diisocyanate, 4,4'-toluidine diisocyanate, 2,4,6-triisocyanatotoluene, 1,3,5-triisocyanatobenzene, dianisidine diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4', 4′′-triphenylmethane triisocyanate and the like.
  • aliphatic polyisocyanates examples include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate and the like.
  • araliphatic polyisocyanates include ⁇ , ⁇ '-diisocyanate-1,3-dimethylbenzene, ⁇ , ⁇ '-diisocyanate-1,4-dimethylbenzene, ⁇ , ⁇ '-diisocyanate-1,4-diethylbenzene , 1,4-tetramethylxylylene diisocyanate, 1,3-tetramethylxylylene diisocyanate, and the like.
  • alicyclic polyisocyanates include 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, 1,3-cyclopentane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, methyl-2 ,4-cyclohexane diisocyanate, methyl-2,6-cyclohexane diisocyanate, 4,4′-methylenebis(cyclohexyl isocyanate), 1,4-bis(isocyanatomethyl)cyclohexane, 1,4-bis(isocyanatomethyl)cyclohexane and the like. be done.
  • organic polyisocyanate compound (a3) a trimethylolpropane adduct, a water-reacted biuret form, a trimer having an isocyanurate ring, and the like can be used in combination.
  • Any suitable catalyst can be used as the catalyst that can be used in obtaining the polyurethane polyol.
  • Examples of such catalysts include tertiary amine compounds and organometallic compounds.
  • tertiary amine compounds include triethylamine, triethylenediamine, and 1,8-diazabicyclo(5,4,0)-undecene-7 (DBU).
  • organometallic compounds examples include tin-based compounds and non-tin-based compounds.
  • tin compounds include dibutyltin dichloride, dibutyltin oxide, dibutyltin dibromide, dibutyltin dimaleate, dibutyltin dilaurate (DBTDL), dibutyltin diacetate, dibutyltin sulfide, tributyltin sulfide, tributyltin oxide, tributyltin Tin acetate, triethyltin ethoxide, tributyltin ethoxide, dioctyltin oxide, tributyltin chloride, tributyltin trichloroacetate, tin 2-ethylhexanoate and the like.
  • DBTDL dibutyltin dilaurate
  • dibutyltin diacetate dibutyltin sulfide, tributyltin sulfide, tributyltin oxide
  • non-tin compounds include titanium compounds such as dibutyl titanium dichloride, tetrabutyl titanate, and butoxy titanium trichloride; lead compounds such as lead oleate, lead 2-ethylhexanoate, lead benzoate, and lead naphthenate.
  • titanium compounds such as dibutyl titanium dichloride, tetrabutyl titanate, and butoxy titanium trichloride
  • lead compounds such as lead oleate, lead 2-ethylhexanoate, lead benzoate, and lead naphthenate.
  • iron-based compounds such as iron 2-ethylhexanoate and iron acetylacetonate
  • cobalt-based compounds such as cobalt benzoate and cobalt 2-ethylhexanoate
  • zinc-based compounds such as zinc naphthenate and zinc 2-ethylhexanoate
  • zirconium-based compounds such as zirconium naphthenate
  • a catalyst When a catalyst is used to obtain a polyurethane polyol, in a system in which two kinds of polyols, a polyester polyol and a polyether polyol, are present, gelation or a reaction solution may occur in a single catalyst system due to the difference in reactivity. The problem of turbidity is likely to occur. Therefore, by using two kinds of catalysts when obtaining a polyurethane polyol, the reaction rate, the selectivity of the catalyst, etc. can be easily controlled, and these problems can be solved. Combinations of such two types of catalysts include, for example, tertiary amine/organometallic, tin/non-tin, and tin/tin, preferably tin/tin, and more preferably.
  • tin 2-ethylhexanoate is a combination of dibutyltin dilaurate and tin 2-ethylhexanoate.
  • the weight ratio of tin 2-ethylhexanoate/dibutyltin dilaurate is preferably less than 1, more preferably 0.2 to 0.6. If the compounding ratio is 1 or more, gelation may tend to occur due to the balance of catalytic activity.
  • the amount of the catalyst used is preferably 0.01 with respect to the total amount of the polyester polyol (a1), the polyether polyol (a2) and the organic polyisocyanate compound (a3). % to 1.0% by weight.
  • the reaction temperature is preferably less than 100°C, more preferably 85°C to 95°C. If the temperature is 100° C. or higher, it may become difficult to control the reaction rate and the crosslinked structure, and it may become difficult to obtain a polyurethane polyol having a predetermined molecular weight.
  • a catalyst may not be used when obtaining polyurethane polyol.
  • the reaction temperature is preferably 100° C. or higher, more preferably 110° C. or higher.
  • Methods for obtaining polyurethane polyol include, for example, 1) a method of charging a polyester polyol, a polyether polyol, a catalyst, and an organic polyisocyanate into a volumetric flask, and 2) a method of charging a polyester polyol, a polyether polyol, and a catalyst into a flask to produce an organic polyisocyanate.
  • a method of adding the As a method for obtaining a polyurethane polyol, the method 2) is preferable from the viewpoint of controlling the reaction.
  • Any suitable solvent can be used to obtain the polyurethane polyol.
  • suitable solvents include methyl ethyl ketone, ethyl acetate, toluene, xylene and acetone. Among these solvents, toluene is preferred.
  • Polyols preferably include, for example, polyester polyols, polyether polyols, polycaprolactone polyols, polycarbonate polyols, and castor oil-based polyols.
  • the polyol is more preferably polyether polyol.
  • a polyester polyol can be obtained, for example, by an esterification reaction between a polyol component and an acid component.
  • Polyol components include, for example, ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-1 ,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2-methyl -1,8-octanediol, 1,8-decanediol, octadecanediol, glycerin, trimethylolpropane, pentaerythritol, hexanetriol, polypropylene glycol and the like.
  • acid components include succinic acid, methylsuccinic acid, adipic acid, pimelic acid, azelaic acid, sebacic acid, 1,12-dodecanedioic acid, 1,14-tetradecanedioic acid, dimer acid, 2-methyl-1, 4-cyclohexanedicarboxylic acid, 2-ethyl-1,4-cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalenedicarboxylic acid, 4,4'-biphenyldicarboxylic acid, acid anhydrides thereof etc.
  • polyether polyols examples include water, low-molecular-weight polyols (propylene glycol, ethylene glycol, glycerin, trimethylolpropane, pentaerythritol, etc.), bisphenols (bisphenol A, etc.), dihydroxybenzenes (catechol, resorcinol, hydroquinone, etc.). is used as an initiator, polyether polyols obtained by addition polymerization of alkylene oxides such as ethylene oxide, propylene oxide and butylene oxide. Specific examples include polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like.
  • polycaprolactone polyols examples include caprolactone-based polyester diols obtained by ring-opening polymerization of cyclic ester monomers such as ⁇ -caprolactone and ⁇ -valerolactone.
  • Polycarbonate polyols include, for example, polycarbonate polyols obtained by subjecting the above polyol component and phosgene to a polycondensation reaction; Polycarbonate polyols obtained by subjecting carbonic acid diesters such as propylene carbonate, diphenyl carbonate and dibenzyl carbonate to transesterification condensation; copolymerized polycarbonate polyols obtained by combining two or more of the above polyol components; various polycarbonate polyols and carboxyl groups above.
  • Polycarbonate polyol obtained by esterification reaction with the containing compound Polycarbonate polyol obtained by etherification reaction of the above various polycarbonate polyols and hydroxyl group-containing compounds; Obtained by transesterifying the above various polycarbonate polyols and ester compounds.
  • Polycarbonate polyols obtained by transesterification of various polycarbonate polyols and hydroxyl group-containing compounds Polyester-based polycarbonate polyols obtained by polycondensation reaction of various polycarbonate polyols and dicarboxylic acid compounds;
  • castor oil-based polyols examples include castor oil-based polyols obtained by reacting castor oil fatty acids with the above polyol components. Specific examples include castor oil-based polyols obtained by reacting castor oil fatty acids with polypropylene glycol.
  • the number average molecular weight Mn of the polyol is preferably from 300 to 100,000, more preferably from 400 to 75,000, even more preferably from 450 to 50,000, and particularly preferably 500, from the viewpoint that the effects of the present invention can be more expressed. ⁇ 30,000.
  • the polyol preferably contains a polyol (A1) having three OH groups and a number-average molecular weight Mn of 300 to 100,000, in order to further express the effects of the present invention. Only one kind of polyol (A1) may be used, or two or more kinds thereof may be used.
  • the content of the polyol (A1) in the polyol is preferably 5% by weight or more, more preferably 25% by weight to 100% by weight, and still more preferably 50% by weight, from the viewpoint that the effects of the present invention can be further expressed. % to 100% by weight.
  • the number average molecular weight Mn of the polyol (A1) is preferably 1,000 to 100,000, more preferably more than 1,000 and 80,000 or less, still more preferably 1,100 to 70,000, in terms of being able to further express the effects of the present invention. , more preferably 1,200 to 60,000, more preferably 1,300 to 50,000, still more preferably 1,400 to 40,000, still more preferably 1,500 to 35,000, particularly preferably 1,700 to 32,000, most preferably 2000-30000.
  • the polyol may contain a polyol (A2) having 3 or more OH groups and a number average molecular weight Mn of 20000 or less. Only one kind of polyol (A2) may be used, or two or more kinds thereof may be used.
  • the number average molecular weight Mn of the polyol (A2) is preferably from 100 to 20,000, more preferably from 150 to 10,000, still more preferably from 200 to 7,500, and particularly Preferably 300-6000, most preferably 300-5000.
  • the polyol (A2) is preferably a polyol having 3 OH groups (triol), a polyol having 4 OH groups (tetraol), or 5 OH groups, in that the effects of the present invention can be further expressed. and polyols (hexaols) having six OH groups.
  • the total amount of the polyol (tetraol) having 4 OH groups, the polyol (pentaol) having 5 OH groups, and the polyol (hexaol) having 6 OH groups as the polyol (A2) is From the viewpoint that the effect can be expressed more, the content in the polyol is preferably 70% by weight or less, more preferably 60% by weight or less, still more preferably 40% by weight or less, and particularly preferably 30% by weight. % or less.
  • the content of the polyol (A2) in the polyol is preferably 95% by weight or less, more preferably 0% by weight to 75% by weight, from the viewpoint that the effects of the present invention can be more expressed.
  • the content of the polyol having 4 or more OH groups and a number average molecular weight Mn of 20000 or less is preferably 70 wt. %, more preferably 60% by weight or less, still more preferably 50% by weight or less, particularly preferably 40% by weight or less, and most preferably 30% by weight or less.
  • the urethane pressure-sensitive adhesive composition preferably contains a cross-linking agent so that the effects of the present invention can be exhibited more.
  • Urethane prepolymers and polyols as base polymers can each be a component of a urethane-based pressure-sensitive adhesive composition in combination with a cross-linking agent.
  • a polyfunctional isocyanate-based cross-linking agent is preferable in that the effects of the present invention can be further expressed.
  • poly-functional isocyanate-based cross-linking agent any appropriate polyfunctional isocyanate-based cross-linking agent that can be used in the urethanization reaction can be adopted as the poly-functional isocyanate-based cross-linking agent.
  • polyfunctional isocyanate-based cross-linking agents include lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate; Alicyclic polyisocyanates such as silylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, and hydrogenated xylene diisocyanate; aromatic polyisocyanates such as diisocyanate; Polyfunctional isocyanate-based cross-linking agents include, for example, trimethylolpropane/tolylene diisocyanate adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coron
  • the urethane-based pressure-sensitive adhesive composition may contain any appropriate other component within a range that does not impair the effects of the present invention.
  • Such other components include, for example, polymer components other than urethane prepolymers and polyols, cross-linking accelerators, cross-linking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.).
  • anti-aging agents inorganic fillers, organic fillers, metal powders, coloring agents (pigments, dyes, etc.), foil products, anti-degradation agents, chain transfer agents, plasticizers, softeners, surfactants, antistatic agents, conductive agents, stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts and the like.
  • the urethane-based pressure-sensitive adhesive composition preferably contains an anti-degradation agent in that it can further exhibit the effects of the present invention. Only one kind of anti-degradation agent may be used, or two or more kinds thereof may be used.
  • the anti-degradation agent preferably includes an antioxidant, an ultraviolet absorber, and a light stabilizer, in that the effects of the present invention can be further expressed.
  • antioxidants examples include radical chain inhibitors and peroxide decomposers.
  • radical chain inhibitors examples include phenol antioxidants and amine antioxidants.
  • phenolic antioxidants include monophenolic antioxidants, bisphenolic antioxidants, and polymeric phenolic antioxidants.
  • monophenol antioxidants include 2,6-di-t-butyl-p-cresol, butylated hydroxyanisole, 2,6-di-t-butyl-4-ethylphenol, stearin- ⁇ -( 3,5-di-t-butyl-4-hydroxyphenyl)propionate and the like.
  • bisphenol antioxidants examples include 2,2'-methylenebis(4-methyl-6-t-butylphenol), 2,2'-methylenebis(4-ethyl-6-t-butylphenol), 4,4' -thiobis(3-methyl-6-t-butylphenol), 4,4′-butylidenebis(3-methyl-6-t-butylphenol), 3,9-bis[1,1-dimethyl-2-[ ⁇ -( 3-t-butyl-4-hydroxy-5-methylphenyl)propionyloxy]ethyl]2,4,8,10-tetraoxaspiro[5,5]undecane and the like.
  • polymeric phenolic antioxidants examples include 1,1,3-tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane, 1,3,5-trimethyl-2,4, 6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene, tetrakis-[methylene-3-(3′,5′-di-t-butyl-4′-hydroxyphenyl)propionate]methane , bis[3,3′-bis-(4′-hydroxy-3′-t-butylphenyl)butyric acid]glycol ester, 1,3,5-tris(3′,5′-di-t-butyl -4′-Hydroxybenzyl)-S-triazine-2,4,6-(1H,3H,5H)trione, tocopherol and the like.
  • peroxide decomposers examples include sulfur-based antioxidants and phosphorus-based antioxidants.
  • sulfur-based antioxidants include dilauryl 3,3'-thiodipropionate, dimyristyl 3,3'-thiodipropionate, and distearyl 3,3'-thiodipropionate.
  • Phosphorus antioxidants include, for example, triphenylphosphite, diphenylisodecylphosphite, and phenyldiisodecylphosphite.
  • ultraviolet absorbers examples include benzophenone-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, salicylic acid-based ultraviolet absorbers, oxalic acid anilide-based ultraviolet absorbers, cyanoacrylate-based ultraviolet absorbers, and triazine-based ultraviolet absorbers. be done.
  • Benzophenone-based UV absorbers include, for example, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2' -dihydroxy-4-dimethoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, bis(2-methoxy-4-hydroxy-5-benzoylphenyl ) methane and the like.
  • Benzotriazole-based UV absorbers include, for example, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-butylphenyl)benzotriazole, 2-( 2′-hydroxy-3′,5′-di-tert-butylphenyl)benzotriazole, 2-(2′-hydroxy-3′-tert-butyl-5′-methylphenyl)-5-chlorobenzotriazole, 2 -(2'-hydroxy-3',5'-di-tert-butylphenyl)5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole, 2-(2'-hydroxy-4'-octoxyphenyl)benzotriazole, 2-[2'-hydroxy-3'-(3'',4'',5'',6'',-tetrahydrophthalimido
  • salicylic acid-based ultraviolet absorbers examples include phenyl salicylate, p-tert-butylphenyl salicylate, and p-octylphenyl salicylate.
  • cyanoacrylate-based ultraviolet absorbers examples include 2-ethylhexyl-2-cyano-3,3'-diphenyl acrylate and ethyl-2-cyano-3,3'-diphenyl acrylate.
  • Examples of light stabilizers include hindered amine light stabilizers and UV stabilizers.
  • Examples of hindered amine light stabilizers include bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, methyl -1,2,2,6,6-pentamethyl-4-piperidyl sebacate and the like.
  • UV stabilizers include, for example, nickel bis(octylphenyl) sulfide, [2,2′-thiobis(4-tert-octylphenolate)]-n-butylamine nickel, nickel complex-3,5-di-tert- Butyl-4-hydroxybenzyl-phosphate monoethylate, benzoate-type quenchers, nickel-dibutyldithiocarbamate, and the like.
  • urethane-based polymer formed from urethane-based adhesive composition containing urethane prepolymer and polyfunctional isocyanate-based cross-linking agent Only one type of urethane prepolymer may be used, or two or more types may be used. Only one type of polyfunctional isocyanate-based cross-linking agent may be used, or two or more types may be used.
  • any method of producing a urethane polymer using a so-called "urethane prepolymer" as a raw material may be used.
  • any appropriate manufacturing method can be adopted.
  • the number average molecular weight Mn of the urethane prepolymer is preferably 3,000 to 1,000,000 in that the effects of the present invention can be further exhibited.
  • the equivalent ratio of NCO groups to OH groups in the urethane prepolymer and the polyfunctional isocyanate-based cross-linking agent is preferably 5.0 or less as NCO groups/OH groups, in terms of allowing the effects of the present invention to be exhibited more, More preferably 0.01 to 4.75, still more preferably 0.02 to 4.5, particularly preferably 0.03 to 4.25, most preferably 0.05 to 4.0 be.
  • the content of the polyfunctional isocyanate-based cross-linking agent is preferably 0.01 to 30 parts by weight with respect to 100 parts by weight of the urethane prepolymer, in that the effects of the present invention can be more expressed. parts by weight, more preferably 0.05 to 25 parts by weight, still more preferably 0.1 to 20 parts by weight, particularly preferably 0.5 to 17.5 parts by weight and most preferably 1 to 15 parts by weight.
  • the equivalent ratio of the NCO group to the OH group in the polyol and the polyfunctional isocyanate-based cross-linking agent is preferably 5.0 or less as NCO group/OH group, and more preferably 5.0 or less, from the viewpoint that the effects of the present invention can be further expressed. is 0.1 to 3.0, more preferably 0.2 to 2.5, particularly preferably 0.3 to 2.25, most preferably 0.5 to 2.0.
  • the content of the polyfunctional isocyanate cross-linking agent is preferably 1.0 to 30 parts by weight with respect to 100 parts by weight of the polyol, in that the effects of the present invention can be further expressed. , more preferably 1.5 to 27 parts by weight, still more preferably 2.0 to 25 parts by weight, particularly preferably 2.3 to 23 parts by weight, most preferably is 2.5 to 20 parts by weight.
  • the urethane-based polymer formed from the urethane-based pressure-sensitive adhesive composition containing a polyol and a polyfunctional isocyanate-based cross-linking agent is preferably a urethane-based pressure-sensitive adhesive composition containing a polyol and a polyfunctional isocyanate-based cross-linking agent. It is formed by curing an object.
  • a method for forming a urethane-based polymer by curing a urethane-based pressure-sensitive adhesive composition containing a polyol and a polyfunctional isocyanate-based cross-linking agent the effect of the present invention, such as a urethanization reaction method using bulk polymerization or solution polymerization, etc. Any appropriate method can be adopted as long as it does not impair the
  • a catalyst is preferably used to cure the urethane-based pressure-sensitive adhesive composition containing a polyol and a polyfunctional isocyanate-based cross-linking agent.
  • catalysts include organometallic compounds and tertiary amine compounds.
  • organometallic compounds include iron-based compounds, tin-based compounds, titanium-based compounds, zirconium-based compounds, lead-based compounds, cobalt-based compounds, and zinc-based compounds.
  • iron-based compounds and tin-based compounds are preferable in terms of reaction speed and pot life of the pressure-sensitive adhesive layer.
  • iron-based compounds include iron acetylacetonate, iron 2-ethylhexanoate, and Nasem ferric iron.
  • tin compounds include dibutyltin dichloride, dibutyltin oxide, dibutyltin dibromide, dibutyltin maleate, dibutyltin dilaurate, dibutyltin diacetate, dibutyltin sulfide, tributyltin methoxide, tributyltin acetate, triethyltin ethoxide, tributyltin ethoxide, dioctyltin oxide, dioctyltin dilaurate, tributyltin chloride, tributyltin trichloroacetate, tin 2-ethylhexanoate and the like.
  • titanium-based compounds examples include dibutyl titanium dichloride, tetrabutyl titanate, and butoxy titanium trichloride.
  • zirconium-based compounds include zirconium naphthenate and zirconium acetylacetonate.
  • lead-based compounds examples include lead oleate, lead 2-ethylhexanoate, lead benzoate, and lead naphthenate.
  • cobalt-based compounds examples include cobalt 2-ethylhexanoate and cobalt benzoate.
  • Examples of zinc-based compounds include zinc naphthenate and zinc 2-ethylhexanoate.
  • tertiary amine compounds include triethylamine, triethylenediamine, 1,8-diazabisic-(5,4,0)-undecene-7, and the like.
  • the amount of the catalyst is preferably 0.005 parts by weight to 1.00 parts by weight, more preferably 0.01 parts by weight to 100 parts by weight of the polyol, in order to further express the effects of the present invention. It is 0.75 parts by weight, more preferably 0.01 to 0.50 parts by weight, and particularly preferably 0.01 to 0.20 parts by weight.
  • any suitable rubber-based pressure-sensitive adhesive such as known rubber-based pressure-sensitive adhesives described in JP-A-2015-074771 can be employed as long as the effects of the present invention are not impaired. . These may be of only one type, or may be of two or more types.
  • the rubber-based pressure-sensitive adhesive may contain any appropriate component within a range that does not impair the effects of the present invention.
  • any suitable silicone-based pressure-sensitive adhesive such as known silicone-based pressure-sensitive adhesives described in JP-A-2014-047280 can be employed as long as the effects of the present invention are not impaired. . These may be of only one type, or may be of two or more types.
  • the silicone-based pressure-sensitive adhesive may contain any appropriate component within a range that does not impair the effects of the present invention.
  • the adhesive tape may contain a separator for the purpose of protecting the adhesive layer.
  • the thickness of the separator is preferably 5 ⁇ m to 250 ⁇ m from the viewpoint that the effects of the present invention can be exhibited more effectively.
  • the separator contains a resin base film.
  • resin substrate films include plastic films made of polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT); polyethylene (PE), polypropylene (PP), Plastic films composed of olefin resins containing ⁇ -olefin as a monomer component such as polymethylpentene (PMP), ethylene-propylene copolymer, ethylene-vinyl acetate copolymer (EVA); polyvinyl chloride (PVC) plastic film composed of vinyl acetate resin; plastic film composed of polycarbonate (PC); plastic film composed of polyphenylene sulfide (PPS); polyamide (nylon), wholly aromatic polyamide Plastic film composed of amide resin such as (aramid); plastic film composed of polyimide resin; plastic film composed of polyether ether ketone (PEEK); polyethylene (PE), polypropylene (PP), etc.
  • PET polyethylene terephthalate
  • PEN polyethylene naphthal
  • Plastic films composed of olefin resin; polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, chlorofluoroethylene-vinylidene fluoride copolymer plastic film composed of fluorine-based resin such as; triacetyl cellulose (TAC); and the like.
  • TAC triacetyl cellulose
  • the resin base film may have only one layer, or may have two or more layers.
  • the resin substrate film may be stretched.
  • the resin base film may be surface-treated.
  • surface treatment include corona treatment, plasma treatment, chromic acid treatment, ozone exposure, flame exposure, high voltage shock exposure, ionizing radiation treatment, and coating treatment with a primer.
  • the resin base film may contain any suitable additive as long as it does not impair the effects of the present invention.
  • the separator may have a release layer in order to enhance the releasability from the adhesive layer.
  • the separator has a release layer, the side of the release layer is laminated directly on the adhesive layer.
  • any suitable material can be adopted as the material for forming the release layer as long as the effects of the present invention are not impaired.
  • forming materials include silicone-based release agents, fluorine-based release agents, long-chain alkyl-based release agents, fatty acid amide-based release agents, and the like. Among these, silicone release agents are preferred.
  • the release layer can be formed as a coating layer.
  • any appropriate thickness can be adopted according to the purpose within a range that does not impair the effects of the present invention.
  • Such a thickness is preferably 10 nm to 2000 nm.
  • the release layer may consist of only one layer, or may consist of two or more layers.
  • silicone-based release layers include addition-reactive silicone resins.
  • the addition reaction type silicone resin include, for example, KS-774, KS-775, KS-778, KS-779H, KS-847H, and KS-847T manufactured by Shin-Etsu Chemical; TPR- 6700, TPR-6710, TPR-6721; SD7220, SD7226 manufactured by Dow Corning Toray;
  • the coating amount (after drying) of the silicone release layer is preferably 0.01 g/m 2 to 2 g/m 2 , more preferably 0.01 g/m 2 to 1 g/m 2 , still more preferably 0.01 g/m 2 to 0.5 g/m 2 .
  • the release layer is formed, for example, by applying the above-described forming material on any appropriate layer by a conventionally known coating method such as reverse gravure coating, bar coating, die coating, etc., and then heating the layer to about 120 to 200°C. It can be carried out by hardening by applying a heat treatment at. Moreover, you may combine heat processing and active-energy-ray irradiation, such as ultraviolet irradiation, as needed.
  • IR measurement (NICOLET iS50 FT-IR, manufactured by ThermoFischer) was used to confirm whether or not the adhesive was separated from the base layer. In-line IR measurement was performed on the base material layer (base material) after the treatment, and the case where the IR spectrum peculiar to the pressure-sensitive adhesive was not observed was evaluated as ⁇ , and the case where it was observed as ⁇ . Those that could not be recovered due to breakage were marked as -.
  • yield of recovered base material was calculated from the ratio of the recovered substrate and the adhesive tape minus the weight of the adhesive.
  • the weight of the adhesive was calculated from the film thickness, the area of the adhesive tape, and the specific gravity.
  • Recovered base material yield (%) [recovered base material/(weight of adhesive tape - weight of adhesive)] x 100
  • Example 2 The procedure was the same as in Example 1, except that the acrylic pressure-sensitive adhesive tape "No. 3195HS” was used instead of the acrylic pressure-sensitive adhesive tape "RP207". The evaluation results are shown in Table 1. In confirming the state of separation by IR measurement, it was confirmed whether or not the peak around 1150 cm ⁇ 1 derived from the adhesive had disappeared in the IR spectrum.
  • Example 3 The procedure was carried out in the same manner as in Example 1, except that a rubber adhesive tape "No. 3040" was used instead of the acrylic adhesive tape "RP207". The evaluation results are shown in Table 1. In confirming the state of separation by IR measurement, it was confirmed whether or not the peak around 1650 cm ⁇ 1 derived from the adhesive had disappeared in the IR spectrum.
  • Example 4 The procedure was the same as in Example 1, except that an acrylic pressure-sensitive adhesive tape "No. 395N” was used instead of the acrylic pressure-sensitive adhesive tape "RP207". The evaluation results are shown in Table 1. In confirming the state of separation by IR measurement, it was confirmed whether or not the peak around 1150 cm ⁇ 1 derived from the adhesive had disappeared in the IR spectrum.
  • Example 5 The procedure was the same as in Example 1, except that a silicone adhesive tape "No. 973UL” was used instead of the acrylic adhesive tape "RP207". The evaluation results are shown in Table 1. In confirming the state of separation by IR measurement, it was confirmed whether or not the peak around 1000 cm ⁇ 1 derived from the adhesive had disappeared in the IR spectrum.
  • Example 6 The procedure was the same as in Example 1, except that a silicone adhesive tape "No. 360UL” was used instead of the acrylic adhesive tape "RP207". The evaluation results are shown in Table 1. In confirming the state of separation by IR measurement, it was confirmed whether or not the peak around 1000 cm ⁇ 1 derived from the adhesive had disappeared in the IR spectrum.
  • Example 7 The same procedure as in Example 1 was repeated except that an abrasive belt (particle size: #40, manufactured by Makita) was used instead of the abrasive belt (particle size: #100, manufactured by Makita). The evaluation results are shown in Table 1. In confirming the state of separation by IR measurement, it was confirmed whether or not the peak around 1000 cm ⁇ 1 derived from the adhesive had disappeared in the IR spectrum.
  • Example 8 The procedure of Example 1 was repeated except that a polishing belt (particle size: #600, manufactured by Makita) was used instead of the polishing belt (particle size: #100, manufactured by Makita). The evaluation results are shown in Table 1. In confirming the state of separation by IR measurement, it was confirmed whether or not the peak around 1000 cm ⁇ 1 derived from the adhesive had disappeared in the IR spectrum.
  • Example 9 A 5 cm wide acrylic adhesive tape "RP207" is transported while removing the separator, and the exposed adhesive layer is attached to an electric tool (PROXXON mini router MM50/D) (hand grinder) with an abrasive cloth attachment (#100). The attached one was pressed against the plate at a rotation speed of 20000 rpm to separate the adhesive constituting the adhesive layer. The separated adhesive was removed by air blow. The tension of the acrylic adhesive tape was set to 30 N when the acrylic adhesive tape was pressed against the power tool. Table 2 shows the evaluation results. In confirming the state of separation by IR measurement, it was confirmed whether or not the peak around 1150 cm ⁇ 1 derived from the adhesive had disappeared in the IR spectrum.
  • Example 2 The procedure of Example 9 was repeated except that a metal brush attachment was used in place of the polishing cloth attachment (#100). Table 2 shows the evaluation results. In confirming the state of separation by IR measurement, it was confirmed whether or not the peak around 1150 cm ⁇ 1 derived from the adhesive had disappeared in the IR spectrum.
  • the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer was separated by pressing at a belt speed of 5.8 m/sec.
  • the separated adhesive was removed by air blow.
  • the tension of the acrylic adhesive tape when pressing the acrylic adhesive tape against the polishing belt was set to 30N. Table 3 shows the evaluation results. In confirming the state of separation by IR measurement, it was confirmed whether or not the peak around 1150 cm ⁇ 1 derived from the adhesive had disappeared in the IR spectrum.
  • the base material and the adhesive that constitute the adhesive tape can be easily separated at low cost. etc. can be suitably used.
  • Adhesive tape 10 Base material layer 20 Adhesive layer 20a Adhesive layer 20b Adhesive layer 20' Components derived from the adhesive layer (adhesive agent) 20a' Component derived from adhesive layer (adhesive) 20b' component derived from adhesive layer (adhesive) 30 separator 1 roll body 2 separator take-up roll 3 roll

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