WO2023282218A1 - 粘着テープ - Google Patents

粘着テープ Download PDF

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Publication number
WO2023282218A1
WO2023282218A1 PCT/JP2022/026548 JP2022026548W WO2023282218A1 WO 2023282218 A1 WO2023282218 A1 WO 2023282218A1 JP 2022026548 W JP2022026548 W JP 2022026548W WO 2023282218 A1 WO2023282218 A1 WO 2023282218A1
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WIPO (PCT)
Prior art keywords
tackifier
hydrogenated
petroleum resin
pressure
styrene
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
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PCT/JP2022/026548
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English (en)
French (fr)
Japanese (ja)
Inventor
佳明 山本
晃純 木村
大輔 吉村
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Denka Co Ltd
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Denka Co Ltd
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Publication date
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Priority to JP2023533115A priority Critical patent/JP7538963B2/ja
Publication of WO2023282218A1 publication Critical patent/WO2023282218A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • 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
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J153/02—Vinyl aromatic monomers and conjugated dienes
    • 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]

Definitions

  • the present invention relates to adhesive tapes.
  • Adhesive tapes are used in industrial fields such as home appliances, automobiles, construction, etc., for the purpose of, for example, joining various assembly members.
  • Adhesives used for adhesive tapes include acrylic adhesives and rubber adhesives, and acrylic adhesives are often used.
  • Patent Document 1 discloses a base polymer comprising a block copolymer of a monovinyl-substituted aromatic compound and a conjugated diene compound, and a tackifying resin (TH) having a hydroxyl value of 80 mgKOH/g or more.
  • TH tackifying resin
  • Patent Document 2 discloses a hot melt composition containing a styrene block copolymer (A) and a liquid softening agent (B), wherein the styrene block copolymer (A) is a styrene heat
  • the hot melt composition which is a hydrogenated product of a plastic elastomer, has a viscosity ratio ( ⁇ 1/ ⁇ 2) between the melt viscosity ( ⁇ 1) at 140°C and the melt viscosity ( ⁇ 2) at 180°C, and the melt viscosity at 180°C is Hot melt compositions are disclosed that are characterized by specific ranges.
  • Patent Document 3 a styrene-based thermoplastic elastomer A, a tackifying resin B, a plasticizer C, and a vinyl copolymer D having an ethylene-carbonyl bond are contained, and the mass part of the plasticizer C is C, and a hot melt adhesive characterized in that the ratio represented by D/C is 0.10 to 0.80, where D is the part by mass of the vinyl copolymer D having an ethylene-carbonyl bond. It is
  • JP 2013-216853 A Japanese Patent Application Laid-Open No. 2019-116608 JP 2020-203977 A
  • the present invention has been made in view of such circumstances, and provides a pressure-sensitive adhesive tape having high adhesive strength and holding power at high temperatures and high tack.
  • a pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer containing a pressure-sensitive adhesive composition
  • the pressure-sensitive adhesive composition comprises a styrene-butadiene-based block copolymer, a terpene-based resin that is liquid at 23 ° C., a first and a second tackifier, the styrene-butadiene block copolymer has a partially hydrogenated butadiene portion, and the first tackifier has a softening point of 120 ° C.
  • the first tackifier is selected from the group consisting of C9 petroleum resin, C5C9 petroleum resin, C5 petroleum resin, hydrogenated C5 petroleum resin, hydrogenated C5C9 petroleum resin, hydrogenated C9 petroleum resin wherein the second tackifier has a softening point of 135° C. or higher, and the second tackifier contains a petroleum resin.
  • the present inventors have found that in a pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer containing a pressure-sensitive adhesive composition, the pressure-sensitive adhesive composition contains a styrene-butadiene-based block copolymer and a terpene-based resin that is liquid at 23°C. , a first tackifier, and a second tackifier, and specifying the softening point and type of the first tackifier and the softening point and type of the second tackifier, The inventors have found that a pressure-sensitive adhesive tape having high adhesive strength and holding power in , and high tackiness have been achieved, leading to the completion of the present invention.
  • a pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer containing a pressure-sensitive adhesive composition, wherein the pressure-sensitive adhesive composition comprises a styrene-butadiene-based block copolymer, a terpene-based resin that is liquid at 23°C, and a first tackifier. agent, and a second tackifier, the styrene-butadiene block copolymer has a partially hydrogenated butadiene portion, and the first tackifier has a softening point of 120 ° C. or less.
  • the pressure-sensitive adhesive composition comprises a styrene-butadiene-based block copolymer, a terpene-based resin that is liquid at 23°C, and a first tackifier. agent, and a second tackifier, the styrene-butadiene block copolymer has a partially hydrogenated butadiene portion, and the first tackifier has a softening point
  • the first tackifier is selected from the group consisting of C9 petroleum resin, C5C9 petroleum resin, C5 petroleum resin, hydrogenated C5 petroleum resin, hydrogenated C5C9 petroleum resin, and hydrogenated C9 petroleum resin 1, wherein the second tackifier has a softening point of 135° C. or higher and comprises a petroleum resin.
  • the pressure-sensitive adhesive composition is 100 parts by mass, the pressure-sensitive adhesive composition contains 45.0 to 55.0 parts by mass of a styrene-butadiene-based block copolymer and a terpene-based resin that is liquid at 23 ° C.
  • the second tackifier contains at least one selected from C5 petroleum resins, hydrogenated C5 petroleum resins, hydrogenated C9 petroleum resins, and hydrogenated C5C9 petroleum resins having a softening point of 135 ° C. or higher, [ 1] or the pressure-sensitive adhesive tape according to [2].
  • the adhesive tape which concerns on this invention the adhesive tape which has high adhesive force and holding power in high temperature, and high tack can be obtained.
  • ADVANTAGE OF THE INVENTION The adhesive tape which concerns on this invention can adhere
  • FIG. 1 is a schematic diagram of an adhesive tape according to one embodiment of the present invention.
  • the adhesive tape according to the present invention comprises an adhesive layer containing an adhesive composition.
  • the pressure-sensitive adhesive composition according to the present invention contains a styrene-butadiene-based block copolymer, a terpene-based resin that is liquid at 23°C, a first tackifier, and a second tackifier.
  • the tackifier refers to a thermoplastic resin that is liquid or solid at room temperature and is added to increase adhesiveness.
  • Specific examples of tackifiers include rosin-based, terpene-based, and petroleum-based tackifiers.
  • the styrene-butadiene-based block copolymer according to the present invention is a block copolymer containing a block having a styrene-derived monomer unit and a block having a butadiene-derived monomer unit. means a polymer.
  • Styrene-butadiene-based block copolymers can be used singly. For example, those having different contents of monomer units derived from styrene or those having different diblock copolymer contents. can be used in combination of two or more.
  • the styrene-butadiene-based block copolymer preferably has a styrene-derived monomer unit content of 5 to 50% by mass, more preferably 10 to 40% by mass.
  • the content of monomer units derived from styrene is, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50% by mass. or within a range between the two. By setting the amount in such a range, the obtained adhesive tape has appropriate adhesive strength and holding power to the adherend.
  • the content of monomer units derived from styrene can be measured according to JIS K6383.
  • the butadiene portion is partially hydrogenated.
  • the butadiene portion of the styrene-butadiene-based block copolymer is preferably hydrogenated in an amount of 20 to 90% by mass, more preferably in an amount of 30 to 80% by mass.
  • Specific examples of styrene-butadiene block copolymers in which the butadiene portion is partially hydrogenated include styrene-butadiene-butylene-styrene block copolymers (SBBS).
  • the styrene-butadiene-based block copolymer according to the present invention contains monomer units derived from block B-styrene containing monomer units derived from block A-butadiene containing monomer units derived from styrene.
  • a triblock copolymer containing block C is preferably included.
  • the styrene-butadiene-based block copolymer according to the present invention includes a block A containing monomer units derived from styrene and a diblock copolymer containing block B containing monomer units derived from butadiene. is preferred.
  • the block B containing monomer units derived from butadiene is preferably partially hydrogenated.
  • the block B containing monomer units derived from butadiene preferably has a butadiene block and a butylene block.
  • the styrene-butadiene-based block copolymer according to the present invention preferably contains 50 to 85% by mass of the diblock copolymer, when the styrene-butadiene-based block copolymer is 100% by mass. It is more preferable to contain % by mass.
  • the content of the diblock copolymer is, for example, 50, 55, 60, 65, 70, 75, 80, 85% by mass.
  • styrene-butadiene block copolymer may be used for the adhesive, but two or more types may be used in combination.
  • resins with different viscosities and styrene contents it is possible to adjust adhesive strength, holding power, and tack within appropriate ranges.
  • the weight-average molecular weight of the styrene-butadiene-based block copolymer is not particularly limited, but is, for example, preferably 30,000 to 500,000, more preferably 60,000 to 300,000.
  • a weight average molecular weight can be calculated
  • the pressure-sensitive adhesive composition according to the present invention contains a terpene-based resin that is liquid at 23°C.
  • the pressure-sensitive adhesive composition according to the present invention can contain terpene-based resins that are liquid at 23°C singly or in combination of two or more.
  • terpene-based resins examples include Daimaron (liquid terpene resin, flash point 174 ° C.), YS resin CP (liquid terpene resin, flash point 178 ° C.), YS resin PX300N (terpene resin, flash point 202 ° C.), YS POLYSTAR T30 (terpene phenol resin, flash point 205°C) and YS Resin LP (aromatic modified terpene resin, flash point 220°C) manufactured by Yasuhara Chemical Co., Ltd. can be mentioned.
  • YS resin LP is preferably included from the viewpoint of high flash point, low heat loss, and high compatibility with the styrene-butadiene block copolymer of the present invention.
  • the terpene resin that is liquid at 23°C preferably has a viscosity at 25°C of 500 to 150,000 cp, more preferably 1,000 to 100,000 cp.
  • the viscosity at 25° C. is, for example, 500, 1000, 2000, 5000, 10000, 20000, 50000, 100000, 120000, 150000 cp, and may be within a range between any two of the numerical values exemplified herein. .
  • the first tackifier has a softening point of 120° C. or lower.
  • the first tackifier preferably has a softening point of 70° C. or higher.
  • the first tackifier preferably has a softening point of 70 to 120°C, more preferably 80 to 120°C, even more preferably 85 to 115°C.
  • the softening point is, for example, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120 ° C., and within the range between any two of the numerical values illustrated here There may be.
  • fills the said conditions can be used individually by 1 type or in combination of 2 or more types.
  • the first tackifier is any one selected from the group consisting of C9 petroleum resin, C5C9 petroleum resin, C5 petroleum resin, hydrogenated C5 petroleum resin, hydrogenated C5C9 petroleum resin, hydrogenated C9 petroleum resin including. From the viewpoint of the color of the adhesive, it is preferable that the adhesive contains hydrogenated C9 petroleum resin, hydrogenated C5 petroleum resin, or hydrogenated C5C9 petroleum resin, since the adhesive is less colored. Moreover, it is more preferable to contain a hydrogenated C9 petroleum resin from the viewpoint of less odor than other petroleum resins.
  • the pressure-sensitive adhesive composition includes, when the first tackifier contained in the pressure-sensitive adhesive composition is 100% by mass, C9 petroleum resin, C5C9 petroleum resin, C5 petroleum resin, hydrogenated C5 It is preferable that the total amount of petroleum resin, hydrogenated C5C9 petroleum resin, and hydrogenated C9 petroleum resin is 50% by mass or more.
  • the total resin content is, for example, 50, 60, 70, 80, 90, 100% by mass, and may be within a range between any two of the numerical values exemplified here.
  • the first tackifier can also consist of C9 petroleum resin, C5C9 petroleum resin, C5 petroleum resin, hydrogenated C5 petroleum resin, hydrogenated C5C9 petroleum resin, and/or hydrogenated C9 petroleum resin.
  • the second tackifier has a softening point of 135°C or higher.
  • the second tackifier has a softening point of 135°C or higher, preferably 135 to 180°C, more preferably 140 to 170°C.
  • the softening points are, for example, 135, 140, 145, 150, 155, 160, 165, 170, 175, and 180°C, and are within the range between any two of the numerical values exemplified here. good too.
  • those having a softening point of 135° C. or higher can be used singly or in combination of two or more.
  • the second tackifier preferably contains at least one selected from C5 petroleum resin, hydrogenated C5 petroleum resin, hydrogenated C9 petroleum resin, and hydrogenated C5C9 petroleum resin having a softening point of 135° C. or higher. Also, the second tackifier may further contain a terpene phenol resin having a softening point of 135° C. or higher. The second tackifier is a terpene resin with a softening point of 135 ° C.
  • terpene resin aromatic modified terpene resin, hydrogenated terpene phenolic resin, etc.
  • rosin resin modified rosin, polymerized rosin, disproportionated rosin , polymerized rosin esters, modified polymerized rosin esters, stabilized rosin esters, etc.
  • alkylphenol compounds alkylphenol compounds, and the like.
  • a hydrogenated C9 petroleum resin from the viewpoint of less odor than other petroleum resins.
  • a terpene phenol resin is preferably included from the viewpoint of obtaining a PSA composition that has a low melt viscosity and is easy to coat.
  • the pressure-sensitive adhesive composition according to one embodiment of the present invention preferably contains 50% by mass or more of petroleum resin in total when the second tackifier contained in the pressure-sensitive adhesive composition is 100% by mass.
  • the content of the petroleum resin is, for example, 50, 60, 70, 80, 90, 100% by mass. It may be in a range between any two of the numbers given.
  • the second tackifier may also consist of a petroleum resin and/or a terpene phenolic resin, such as C5 petroleum resin, hydrogenated C5 petroleum resin, hydrogenated C5C9 petroleum resin, hydrogenated C9 petroleum resin, and / Alternatively, it may consist of a terpene phenolic resin.
  • a pressure-sensitive adhesive composition according to one embodiment of the present invention comprises a styrene-butadiene-based block copolymer, a terpene-based resin that is liquid at 23° C., It contains a first tackifier and a second tackifier, and the content of each component is not particularly limited.
  • the pressure-sensitive adhesive composition according to one embodiment of the present invention depends on the type of each component, but as an example, the content of each component is as follows, so that the adhesive composition has an excellent balance of holding power, adhesive strength, and tack. It is easy to become a tape.
  • the pressure-sensitive adhesive composition according to one embodiment of the present invention preferably contains 45.0 to 55.0 parts by mass of the styrene-butadiene-based block copolymer per 100 parts by mass of the pressure-sensitive adhesive composition.
  • the content of the styrene-butadiene block copolymer is specifically, for example, 45.0, 46.0, 47.0, 48.0, 49.0, 50.0, 51.0, 52.0 , 53.0, 54.0, 55.0 parts by mass, and may be within a range between any two of the numerical values exemplified here.
  • the pressure-sensitive adhesive composition according to one embodiment of the present invention preferably contains 5.0 to 15.0 parts by mass of a terpene-based resin that is liquid at 23° C. per 100 parts by mass of the pressure-sensitive adhesive composition.
  • the content of the terpene-based resin that is liquid at 23° C. is, for example, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 , 13.0, 14.0, and 15.0 parts by mass, and may be within a range between any two of the numerical values exemplified here.
  • the pressure-sensitive adhesive composition according to one embodiment of the present invention preferably contains 10.0 parts by mass or more of the first tackifier when the pressure-sensitive adhesive composition is 100 parts by mass. It is more preferable to contain .0 parts by mass.
  • the content of the first tackifier is, for example, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18 .0, 19.0, 20.0, 21.0, 22.0, 23.0, 24.0, 25.0 parts by mass, within the range between any two of the values exemplified here There may be.
  • the pressure-sensitive adhesive composition according to one embodiment of the present invention preferably contains 15.0 to 30.0 parts by mass of the second tackifier per 100 parts by mass of the pressure-sensitive adhesive composition. It is preferable to contain 0 to 25.0 parts by mass.
  • the content of the third tackifier is, for example, 15.0, 16.0, 17.0, 18.0, 19.0, 20.0, 21.0, 22.0, 23 .0, 24.0, 25.0, 26.0, 27.0, 28.0, 29.0, 30.0 parts by mass, within the range between any two of the numerical values illustrated here There may be.
  • the pressure-sensitive adhesive composition according to one embodiment of the present invention contains 45.0 to 55.0 parts by mass of a styrene-butadiene-based block copolymer per 100 parts by mass of the pressure-sensitive adhesive composition, and is liquid at 23°C. Containing 5.0 to 15.0 parts by mass of terpene resin, 10.0 to 25.0 parts by mass of the first tackifier, and 15.0 to 30.0 parts by mass of the second tackifier is preferred.
  • the pressure-sensitive adhesive composition according to one embodiment of the present invention tends to be a pressure-sensitive adhesive tape with an excellent balance of holding power, adhesive strength, and tack by setting the content of each component within the above numerical range.
  • the pressure-sensitive adhesive composition according to the present invention contains plasticizers, antioxidants, ultraviolet absorbers, stabilizers, fillers, modifiers, and so on within a range that does not impede the effects of the present invention. It may contain various additives such as a substance.
  • the adhesive composition according to one embodiment of the present invention can contain a plasticizer.
  • the pressure-sensitive adhesive composition according to one embodiment of the present invention preferably has a plasticizer content of less than 4 parts by mass with respect to 100 parts by mass of the pressure-sensitive adhesive composition.
  • the content of the plasticizer is, for example, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5 parts by mass. may be in the range between any two of
  • the pressure-sensitive adhesive composition according to one embodiment of the present invention may also contain no plasticizer.
  • plasticizers include phthalate-based plasticizers, polybutene, paraffin-based process oils, naphthene-based process oils, aromatic process oils, liquid paraffin, and hydrocarbon-based synthetic oils.
  • polybutene examples include homopolymers of isobutene, copolymers of isobutene and n-butene, and the like.
  • examples of commercially available products include “10N” manufactured by NOF, "Indopol H-100” manufactured by Ineos, “Nisseki Polybutene” manufactured by Nippon Petrochemical, “Tetrax” manufactured by Nippon Petrochemical and the like.
  • Examples of the paraffin-based process oil examples include “PW-32” manufactured by Idemitsu Kosan Co., Ltd., “Dianafresia S32” manufactured by Idemitsu Kosan Co., Ltd., and "PS-32” manufactured by Idemitsu Kosan Co., Ltd.
  • naphthenic process oils examples include “KN4010” manufactured by PetroChina, “Dianafrecia N28” manufactured by Idemitsu Kosan Co., Ltd., “Dianafrecia N90” manufactured by Idemitsu Kosan Co., Ltd., “Dianafrecia U46” manufactured by Idemitsu Kosan Co., Ltd., and Idemitsu. Kosan Co., Ltd. "Diana process oil NR” etc. are mentioned.
  • aromatic process oils examples include “Aromax” manufactured by Nippon Petrochemicals.
  • liquid paraffin examples include “P-100” manufactured by MORESCO and “Kaydol” manufactured by Sonneborn.
  • hydrocarbon-based synthetic oils examples include “Lucant HC-10” manufactured by Mitsui Chemicals, Inc. and “Lucant HC-20” manufactured by Mitsui Chemicals.
  • Phthalic acid ester plasticizers include DINA (diisononyl adipate), DEHP (di-(2-ethylhexyl) phthalate), DBP (dibutyl phthalate), BBP (butylbenzyl phthalate), DINP (diisononyl phthalate), DIDP (diisodecyl phthalate) and DNOP (di-normal octyl phthalate).
  • the total content of the plasticizers exemplified above is preferably within the above numerical range. Further, in the pressure-sensitive adhesive composition according to one embodiment of the present invention, it is particularly preferable that the total content of the phthalate-based plasticizer is within the above numerical range.
  • antioxidants examples include 2,6-di-t-butyl-4-methylphenol, n-octadecyl-3-(4′-hydroxy-3′,5′-di-t-butylphenyl)propionate, 2,2'-methylenebis(4-methyl-6-t-butylphenol), 2,2'-methylenebis(4-ethyl-6-t-butylphenol), 2,4-bis(octylthiomethyl)-o-cresol , 2-t-butyl-6-(3-t-butyl-2-hydroxy-5-methylbenzyl)-4-methylphenyl acrylate, 2,4-di-t-amyl-6-[1-(3 ,5-di-t-amyl-2-hydroxyphenyl)ethyl]phenyl acrylate, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)]acrylate, tetrakis[
  • UV absorbers examples include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-t-butylphenyl)benzotriazole, 2-( Benzotriazole UV absorbers such as 2′-hydroxy-3′,5′-di-t-butylphenyl)-5-chlorobenzotriazole, benzophenone UV absorbers such as 2-hydroxy-4-methoxybenzophenone, salicylic acid Examples include ester-based UV absorbers, cyanoacrylate-based UV absorbers, and hindered amine-based light stabilizers. These can be used alone or in combination.
  • fillers examples include, but are not limited to, calcium carbonate, kaolin, talc, titanium oxide, mica, and styrene beads. These particulate fillers can be used singly or in combination.
  • the production method of the pressure-sensitive adhesive composition according to one embodiment of the present invention is not particularly limited.
  • a method for producing a pressure-sensitive adhesive composition according to one embodiment of the present invention comprises a styrene-butadiene-based block copolymer, a terpene-based resin that is liquid at 23° C., a first tackifier, and a second tackifier.
  • a kneading step of kneading a tackifier or the like by kneading a raw material containing an agent with a kneader kneader can be included.
  • an antioxidant and a plasticizer can be further added.
  • kneading can be performed, for example, for 3 to 30 minutes at 5 to 25 rpm.
  • a method for producing a pressure-sensitive adhesive composition according to one embodiment of the present invention includes a styrene-butadiene block copolymer, in which a styrene-butadiene block copolymer is further added and kneaded after the step of kneading the tackifier and the like. It is preferable to have a combined addition/kneading step. In the step of adding and kneading the styrene-butadiene block copolymer, kneading can be performed, for example, for 20 to 200 minutes at 5 to 25 rpm.
  • Adhesive Layer/Adhesive Tape The adhesive tape according to the present invention comprises an adhesive layer containing the above adhesive composition.
  • the pressure-sensitive adhesive layer is not particularly limited, but it is preferable to use a method in which raw materials of the pressure-sensitive adhesive are heated, melted and kneaded, and then discharged from a T-die to be applied to the base material. That is, the method for producing an adhesive tape according to one embodiment of the present invention preferably includes a coating step of applying the adhesive composition to a substrate by a hot-melt method.
  • Conventional adhesive tapes for the automotive field, etc. have a process of applying an adhesive composition, in which the adhesive is dissolved in a solvent such as solvent or water, to the base material, and volatilizing the solvent or water. The energy and cost required for the production were large, and the production time was long.
  • the pressure-sensitive adhesive composition according to the present invention has a low viscosity at high temperatures and can be applied by a hot-melt method, so that a pressure-sensitive adhesive tape can be produced in a short time with little energy and cost.
  • a coating method a non-contact coating method or a contact method can be adopted.
  • curtain coat product name: Crosscoat, manufactured by ITW Dynatec
  • slot die coating product name, manufactured by True Coat Nordson
  • the thickness of the adhesive layer can be 50 to 100 ⁇ m.
  • the thickness of the pressure-sensitive adhesive layer is, for example, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 ⁇ m.
  • Conventional solvent-based pressure-sensitive adhesive compositions require a longer drying process depending on the thickness of the pressure-sensitive adhesive layer to form a thicker pressure-sensitive adhesive layer, resulting in increased energy consumption and cost.
  • the pressure-sensitive adhesive composition according to the present invention Viscosity at high temperature is within a specific range, and coating by hot melt method is possible, so that a relatively thick pressure-sensitive adhesive layer can be manufactured with less energy and cost than before, and in a short time. be able to.
  • the pressure-sensitive adhesive tape according to the present invention is more preferably a double-sided tape having pressure-sensitive adhesive layers on both sides of a nonwoven fabric. Moreover, it is more preferable that the pressure-sensitive adhesive tape according to the present invention has a pressure-sensitive adhesive layer having the thickness described above on both sides of the nonwoven fabric.
  • FIG. 1 shows the configuration of an adhesive tape according to one embodiment of the present invention.
  • the adhesive tape has an adhesive layer 2 and an adhesive layer 4 having a thickness of 50 to 100 ⁇ m on both sides of the nonwoven fabric 3 .
  • the adhesive layer 2 has the double-sided release film 1 bonded to the surface opposite to the surface in contact with the nonwoven fabric.
  • the adhesive tape according to the present invention has an adhesive strength to a SUS plate at 80°C based on JIS Z0237 of 3.0 N/cm or more, preferably 3.5 N/cm or more.
  • the adhesive strength is, for example, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0 N/cm, and may be in the range between any two of the values exemplified here.
  • Adhesion can be controlled by adjusting the type and amount of the adhesive composition.
  • the adhesive strength can be obtained by measuring the 180° peel adhesive strength to a SUS plate in an 80° C. atmosphere based on JIS Z0237 "10. Adhesive strength.”
  • the adhesive tape according to the present invention has a holding power at 80°C based on JIS Z0237 of 100 minutes or more, preferably 10 minutes or more.
  • the holding power is, for example, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 minutes, and is within the range between any two of the numerical values exemplified here. good too.
  • Holding power can be controlled by adjusting the formulation type and amount of the adhesive composition.
  • the holding power is determined by attaching an adhesive tape with an adhesive area of 20 mm ⁇ 20 mm to a SUS plate in an atmosphere of 80 ° C based on JIS Z0237 "13. Holding power", and measuring the time until the weight falls with a load of 1 kg. can be evaluated with
  • the pressure-sensitive adhesive tape according to the present invention has high adhesive strength and high holding power to SUS plates at high temperatures, and further has excellent tack.
  • the pressure-sensitive adhesive tape according to the present invention makes use of such properties and can bond various members together with higher reliability and at a lower cost in industrial fields such as home appliances, automobiles, and construction.
  • the adhesive tape according to one embodiment of the present invention can be suitably used, for example, for fixing interior parts and exterior parts in the field of automobiles, OA equipment, home appliances, and the like.
  • a kneader kneader (manufactured by Toshin Co., Ltd.) was heated to 200° C. in advance.
  • a terpene resin that is liquid at 23° C. or a rosin ester, a first tackifier, a second tackifier and an antioxidant were added to a kneader and kneaded for 10 minutes at 15 rpm.
  • a block copolymer was added and kneaded at 15 rpm for 100 minutes to obtain adhesive compositions 1-18.
  • Table 1 shows the blending amount (parts by mass) of each component.
  • T-160 (manufactured by Yasuhara Chemical Co., Ltd.): terpene phenol resin, softening point 160 ° C.
  • Alcon P-140 (manufactured by Arakawa Chemical Industries, Ltd.): Hydrogenated C9 petroleum resin, softening point 140 ° C.
  • Imerb P-140 (Idemitsu Kosan Co., Ltd.): Hydrogenated C5C9 petroleum resin, softening point 140°C Quinton 1340 (manufactured by Nippon Zeon Co., Ltd.): C5 petroleum resin, softening point 140 ° C.
  • OP-501 (manufactured by ENEOS Corporation): Hydrogenated C5 petroleum resin, softening point 138 ° C.
  • Asaprene N521 (manufactured by Asahi Kasei Corporation): SBBS (a styrene-butadiene-based block copolymer in which the butadiene portion is partially hydrogenated, a styrene-butadiene-butylene-styrene block copolymer), weight average molecular weight 15
  • SBBS styrene-butadiene-butylene-styrene block copolymer, which is a styrene-butadiene-based block copolymer in which the butadiene portion is partially hydrogenated
  • weight average molecular weight 80,000 Quintac 3421 (manufactured by Nippon Zeon Co., Ltd.): SIS (styrene-isoprene-
  • the pressure-sensitive adhesive compositions 1 to 18 were heated to 200° C. with a melter and dissolved, and coated on rayon paper (Daifuku Paper Co., No. 5200, 18 g/m 2 ) with a slot die coater (Nordson) to a thickness of 70 ⁇ m. , laminated with a double-sided release paper and wound up. Further, the surface not coated with the adhesive composition was similarly coated with a 70 ⁇ m-thick adhesive composition using a slot die coater (Nordson) and wound up.
  • Adhesive strength Based on JIS Z0237 "10. Adhesive strength", the adhesive strength (180° peel adhesive strength) to a SUS plate was measured in an 80°C atmosphere. First, a PET film having a thickness of 25 ⁇ m was attached to one side of a double-sided tape, and the other side of the tape was attached to a SUS plate and pressed with 2 kg. This sample was set in an autograph, and after 30 minutes had passed, the adhesive force was measured. The results are shown in the table.
  • Probe tack tester TE-6001 manufactured by Tester Sangyo Co., Ltd. was used to measure the load when the probe was peeled off. Measurement conditions are shown below. Also, the results are shown in the table. Measurement pressure: 100 gf/cm 2 , contact time: 0.2s, Probe moving speed: 10 mm/s, Measurement temperature/humidity: 23°C/50% Probe diameter: ⁇ 5 Probe material: SUS

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56163174A (en) * 1980-05-22 1981-12-15 Arakawa Chem Ind Co Ltd Hot melt-type pressure sensitive adhesive
JPH0195175A (ja) * 1987-08-31 1989-04-13 Minnesota Mining & Mfg Co <3M> 使い捨ておむつ及び成人失禁用被服のための再固定可能な閉止装置
JP2013216852A (ja) * 2012-03-16 2013-10-24 Nitto Denko Corp 粘着剤組成物および粘着シート
WO2015068610A1 (ja) * 2013-11-11 2015-05-14 リンテック株式会社 タイヤ用粘着シートおよびタイヤ用粘着シートの製造方法
JP2016060847A (ja) * 2014-09-18 2016-04-25 ヘンケルジャパン株式会社 アルカリ分散型ホットメルト粘着剤
WO2021065662A1 (ja) * 2019-10-01 2021-04-08 デンカ株式会社 ホットメルト粘着剤組成物、粘着テープ、及び粘着テープの製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56163174A (en) * 1980-05-22 1981-12-15 Arakawa Chem Ind Co Ltd Hot melt-type pressure sensitive adhesive
JPH0195175A (ja) * 1987-08-31 1989-04-13 Minnesota Mining & Mfg Co <3M> 使い捨ておむつ及び成人失禁用被服のための再固定可能な閉止装置
JP2013216852A (ja) * 2012-03-16 2013-10-24 Nitto Denko Corp 粘着剤組成物および粘着シート
WO2015068610A1 (ja) * 2013-11-11 2015-05-14 リンテック株式会社 タイヤ用粘着シートおよびタイヤ用粘着シートの製造方法
JP2016060847A (ja) * 2014-09-18 2016-04-25 ヘンケルジャパン株式会社 アルカリ分散型ホットメルト粘着剤
WO2021065662A1 (ja) * 2019-10-01 2021-04-08 デンカ株式会社 ホットメルト粘着剤組成物、粘着テープ、及び粘着テープの製造方法

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