WO2021065662A1 - 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 - Google Patents
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 Download PDFInfo
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- WO2021065662A1 WO2021065662A1 PCT/JP2020/035980 JP2020035980W WO2021065662A1 WO 2021065662 A1 WO2021065662 A1 WO 2021065662A1 JP 2020035980 W JP2020035980 W JP 2020035980W WO 2021065662 A1 WO2021065662 A1 WO 2021065662A1
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- 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
- C09J7/35—Heat-activated
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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
- 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
- C09J153/025—Vinyl aromatic monomers and conjugated dienes modified
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/10—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an adhesive surface
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
- B05D7/04—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber to surfaces of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/12—Esters; Ether-esters of cyclic polycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L57/00—Compositions of unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C08L57/02—Copolymers of mineral oil hydrocarbons
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- 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
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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
- C09J11/08—Macromolecular additives
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- 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
- C09J125/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Adhesives based on derivatives of such polymers
- C09J125/02—Homopolymers or copolymers of hydrocarbons
- C09J125/04—Homopolymers or copolymers of styrene
- C09J125/08—Copolymers of styrene
- C09J125/10—Copolymers of styrene with conjugated dienes
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- 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
- C09J157/00—Adhesives based on unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09J157/02—Copolymers of mineral oil hydrocarbons
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- 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
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
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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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/26—Porous or cellular plastics
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- 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]
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- 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]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/387—Block-copolymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2252/00—Sheets
- B05D2252/02—Sheets of indefinite length
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- 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
- C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
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- 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
- C09J2301/304—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 the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
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- 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
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
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- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/26—Presence of textile or fabric
- C09J2400/263—Presence of textile or fabric in the substrate
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- C09J2453/00—Presence of block copolymer
Definitions
- the present invention relates to a hot melt adhesive composition, an adhesive tape, and a method for producing an adhesive tape.
- Adhesive tapes in which a styrene-based block copolymer and an adhesive containing a tackifier and the like are applied to the base material are used for various purposes.
- non-woven fabric is widely used as a tape base material because it is a porous body and therefore exhibits sound deadening properties, and has excellent mechanical strength represented by tensile strength and is inexpensive.
- the non-woven fabric is porous and has the backside of the base material of the coating liquid
- the solvent-based adhesive and the water-based adhesive have low viscosities and it has been considered difficult to apply them directly. Therefore, a method of directly coating the substrate by using a hot melt adhesive having a relatively high viscosity can be considered.
- a hot-melt adhesive is applied to a porous substrate with large irregularities such as a non-woven fabric
- the adhesive coating surface becomes uneven although the adhesive does not wrap around the substrate, and the contact area of the adhesive with the adherend becomes uneven. Since it becomes small, there is a problem that the adhesive strength and the holding power are not sufficiently developed.
- a release agent may be applied to the back surface of the base material, but to apply the release agent to a porous base material such as a non-woven fabric, the release agent is dissolved in an organic solvent such as toluene, for example. Since the prepared release agent solution must be applied and the viscosity of the solution is low, there is a problem of the backside of the base material as in the case of applying the above-mentioned pressure-sensitive adhesive. Therefore, a release agent is not required, and an adhesive that exhibits appropriate adhesive strength and holding power that adheres well to the adherend is required.
- the present invention has been made in view of such a problem, and provides a hot melt adhesive composition that exhibits appropriate adhesive force and holding force to an adherend when a porous base material is used. Is.
- the present invention contains a styrene-based block copolymer, a tackifier, and a plasticizing agent.
- the styrene-based block copolymer is a styrene-butadiene block copolymer, and the butadiene portion is partially contained.
- a hot melt adhesive that is hydrogenated and contains 65 to 190 parts by mass of the tackifier and 0.1 to 24 parts by mass of the plasticizer with respect to 100 parts by mass of the styrene block copolymer.
- the composition is provided.
- the tackifier is a petroleum resin.
- the petroleum resin is at least one selected from the group consisting of C5 petroleum resin, C5C9 petroleum resin, and hydrogenated C9 petroleum resin.
- the plasticizer is DINA (diisononyl adipate).
- an adhesive tape comprising a porous base material and a pressure-sensitive adhesive layer provided on the porous base material, wherein the pressure-sensitive adhesive layer contains the hot-melt pressure-sensitive adhesive composition.
- the adhesive force in JISZ0237 "10. Adhesive force" is 1.5 N / cm or more, and the adhesive force in JISZ0237 "13. Adhesive force" is 10 min or more.
- the method for producing an adhesive tape which comprises a step of applying the hot melt adhesive composition onto the base material by a non-contact coating method.
- the hot melt adhesive composition according to an embodiment of the present invention contains a styrene-based block copolymer, a tackifier, and a plasticizer.
- the styrene-based block copolymer is a styrene-butadiene block copolymer, and the butadiene portion is partially hydrogenated.
- Examples of the styrene-butadiene block copolymer in which the butadiene moiety is partially hydrogenated include a styrene-butadiene-butylene-styrene block copolymer (SBBS).
- the butadiene portion of the styrene-butadiene block copolymer is preferably hydrogenated in an amount of 20% by mass to 90% by mass, and more preferably 30% by mass to 80% by mass.
- the weight average molecular weight of the styrene-butadiene block copolymer is not particularly limited, but is, for example, preferably 30,000 to 500,000, and more preferably 60,000 to 300,000.
- the weight average molecular weight can be determined by the gel permeation chromatography (GPC) method.
- the styrene content of the styrene-butadiene block copolymer is preferably 5 to 50% by mass, more preferably 10 to 40% by mass. By setting it in such a range, an appropriate adhesive force and holding force to the adherend are exhibited. Styrene content can be measured using the method described in JIS K6383.
- one type of the styrene-based block copolymer may be used as an adhesive, it can also be preferably used by blending two or more types having different styrene content and weight average molecular weight. That is, by using two or more types of styrene-based block copolymers in combination, for example, the melt viscosity at the time of coating with an adhesive can be lowered, and the viscosity at the time of coating can be easily controlled and therefore preferably used. Can be done. Further, when two or more types of styrene-based block copolymers are used in combination, it is preferable in terms of adhesive properties as well as the ability to adjust the adhesive force and holding force of the adhesive.
- the tackifier is not particularly limited, but is preferably a petroleum resin.
- the petroleum resin include C9 petroleum resin, hydrogenated C9 petroleum resin, C5 petroleum resin, alicyclic petroleum resin, alicyclic / aromatic petroleum resin, terpene resin, rosin resin, and rosin ester resin. , Terpene-phenol resin, alkylphenol resin and the like.
- the petroleum resin is preferably at least one selected from the group consisting of C5 petroleum resin, C5C9 petroleum resin, and hydrogenated C9 petroleum resin. Further, hydrogenated C9 petroleum resin is most preferable. The reason is that even if the adhesive tape is used outdoors, it is less deteriorated by exposure to direct sunlight (ultraviolet rays).
- the tackifier is preferably contained in an amount of 65 to 190 parts by mass, more preferably 80 to 150 parts by mass, and further preferably 100 to 150 parts by mass with respect to 100 parts by mass of the styrene block copolymer. Within such a range, it is possible to develop an appropriate adhesive force and holding force to the adherend.
- the content of this tackifier is, for example, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150. , 155,160,165,170,175,180,185,190 parts by mass, and may be within the range between any two of the numerical values exemplified here.
- the hot melt adhesive composition according to one embodiment of the present invention contains a plasticizer.
- the hot melt adhesive composition contains 0.1 to 24 parts by mass of the plasticizer, preferably 1 to 20 parts by mass, and 5 to 15 parts by mass with respect to 100 parts by mass of the styrene block copolymer. Is more preferable.
- a phthalate ester-based plasticizer is preferable because it has good compatibility with styrene-based block copolymers and a plasticizing effect can be obtained with a small amount.
- phthalate-based plasticizers include DINA (diisononyl adipate), DEHP (di- (2-ethylhexyl) phthalate), DBP (dibutylphthalate), BBP (butylbenzylphthalate), DINP (diisononylphthalate), and DIDP (diisodecyl). Phthalate), DNOP (dinormal octyl phthalate) (.
- phthalates other than DINA are used because regulations such as REACH (Registration, Evolution, Autration, and Restriction of Chemicals) may be applied.
- DINA can be preferably used because these regulations do not apply.
- the hot melt adhesive composition according to one embodiment of the present invention contains, if necessary, an inorganic filler, a modifier, a stabilizer, an antioxidant, an ultraviolet absorber, and the like, as long as the effects of the present invention are not impaired. It may contain various additives.
- the adhesive tape according to an embodiment of the present invention includes a porous base material and an adhesive layer provided on the porous base material.
- the adhesive tape has an adhesive strength of JISZ0237 "10.
- Adhesive strength of preferably 1.5 N / cm or more, and more preferably 2.0 N / cm or more.
- the adhesive strength is preferably 8 N / cm or less, and more preferably 6 N / cm or less.
- the adhesive tape has a holding power of JISZ0237 "13. Holding power" of preferably 10 minutes or more, more preferably 20 minutes or more.
- the holding power is preferably 100 min or less, and more preferably 80 min or less. By setting it in such a range, it has a sufficient holding force, but it is easy to handle when it is wound into a tape.
- the porous base material is not particularly limited as long as it is a base material made of a porous material, but a non-woven fabric is preferable because it has excellent mechanical strength represented by tensile strength and is inexpensive.
- the pressure-sensitive adhesive layer contains the above-mentioned hot-melt pressure-sensitive adhesive composition.
- the basis weight of the pressure-sensitive adhesive layer is not particularly limited, but is, for example, 10 to 100 g / m 2 . If the basis weight is too small, the adhesiveness may be insufficient, and if it is too large, the coating performance may be deteriorated.
- the method for producing an adhesive tape according to an embodiment of the present invention includes a step of applying the hot melt adhesive composition onto a substrate.
- the coating method is not particularly limited, but it is preferable to heat the raw material of the adhesive to melt and knead it and apply it by the hot melt method, and it is more preferable to apply it by the non-contact coating method.
- non-contact coating is a cross coater (manufactured by ITW Dynatec).
- ITW Dynatec manufactured by ITW Dynatec.
- a direct adhesive for a base material such as a non-woven fabric
- the base material is impregnated with the pressure-sensitive adhesive, and the adhesive characteristics are significantly deteriorated.
- a cloth coater it is preferable to apply the adhesive to the non-woven fabric because the penetration of the adhesive can be suppressed and the deterioration of the adhesive characteristics is unlikely to occur.
- the pressure-sensitive adhesive composition is applied onto the substrates shown in Tables 1 and 2 by a non-contact coating method so as to have a basis weight of 60 g / m 2 to form a pressure-sensitive adhesive layer.
- Adhesive tape was prepared.
- a pressure-sensitive adhesive as shown in Table 1, a pressure-sensitive adhesive, a plasticizer (DINA, Sunsociizer DINA manufactured by Shin Nihon Rika Co., Ltd.), and an antioxidant are used for the styrene-based block copolymer 100. (BASF Ilganox 1010) and an ultraviolet absorber (BASF TINUVIN P) are added and kneaded at 150 ° C.
- the stitch-bonded non-woven fabric is a porous base material
- the PET film is a non-porous base material.
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Abstract
Description
しかし、不織布等、凹凸の大きい多孔質基材にホットメルト粘着剤を塗布すると、粘着剤の基材裏回りはしないが粘着剤塗工面が凹凸になり、被着体に対する粘着剤の接触面積が小さくなるため、粘着力や保持力が十分発現しない問題があった。
この問題を解決するには、例えば粘着剤の厚みを厚くすることが考えられるが、必要な粘着特性を得るには粘着剤を2倍程度以上に塗布する必要があり非効率である。さらにテープ自体の重量も重くなり取り扱いが悪くなる。この問題を解決するには、粘着剤の接触面積が小さくても必要な粘着特性を得ることができるように粘着剤自体を、強粘着、高保持力にする必要がある。
粘着力は強いほど被着体によく貼り付いて良いが、あまり強すぎるとテープ状に巻いたときに基材を繰り出すのが困難になる。
巻き戻し力を軽くするには、基材背面に剥離剤を塗布すればよいが、不織布のような多孔質基材に剥離剤を塗布するのは、例えばトルエン等の有機溶剤に剥離剤を溶解させた剥離剤溶液を塗布しなければならず、溶液の粘度が低いため、前記の粘着剤を塗布した場合と同様に基材の裏回りの問題がある。
そこで、剥離剤が不要で、被着体にも良く貼り付く適度な粘着力、保持力を発現する粘着剤が必要である。
好ましくは、前記粘着付与剤は、石油樹脂である。
好ましくは、前記石油樹脂は、C5石油樹脂、C5C9石油樹脂、及び水添C9石油樹脂からなる群から選ばれる少なくとも1つである。
好ましくは、前記可塑剤は、DINA(ジイソノニルアジペート)である。
好ましくは、JISZ0237 「10.粘着力」における粘着力が1.5N/cm以上であり、JISZ0237 「13.保持力」における保持力が10min以上である。
本発明の一実施形態に係るホットメルト粘着剤組成物は、スチレン系ブロック共重合体と、粘着付与剤と、可塑剤を含有する。
スチレン系ブロック共重合体は、スチレン-ブタジエンブロック共重合体であり、ブタジエン部分が部分的に水素添加されている。ブタジエン部分が部分的に水素添加されているスチレン-ブタジエンブロック共重合体としては、スチレン-ブタジエン-ブチレン-スチレンブロック共重合体(SBBS)が挙げられる。
粘着付与剤は、特に限定されないが、石油樹脂であることが好ましい。石油樹脂としては、例えば、C9石油樹脂、水添C9石油樹脂、C5石油樹脂、脂環族系石油樹脂、脂環族/芳香族系石油樹脂、テルペン系樹脂、ロジン系樹脂、ロジンエステル系樹脂、テルペン-フェノール樹脂、アルキルフェノール樹脂等が挙げられる。中でも、石油樹脂は、C5石油樹脂、C5C9石油樹脂、及び水添C9石油樹脂からなる群から選ばれる少なくとも1つであることが好ましい。また、水添C9石油樹脂が最も好ましい。その理由は、粘着テープが屋外で使用されるようなことがあっても、直射日光(紫外線)曝露による劣化が少ないからである。
本発明の一実施形態に係るホットメルト粘着剤組成物は、可塑剤を含有する。ホットメルト粘着剤組成物は、スチレン系ブロック共重合体100質量部に対し、可塑剤を、0.1~24質量部含み、1~20質量部含むことが好ましく、5~15質量部含むことがより好ましい。
本発明の一実施形態に係るホットメルト粘着剤組成物は、必要に応じて本発明の効果を阻害しない範囲で、無機充填剤、改質剤、安定剤、酸化防止剤、紫外線吸収剤などの各種添加剤を含んでもいてもよい。
本発明の一実施形態に係る粘着テープは、多孔質基材と、多孔質基材上に設けられた粘着剤層とを備える。
多孔質基材は、多孔質材からなる基材であれば特に制限はないが、引張り強度に代表される機械強度が優れ、安価であることから不織布が好ましい。
粘着剤層は、上記ホットメルト粘着剤組成物を含む。粘着剤層の目付量は、特に限定されないが、例えば10~100g/m2である。この目付量が少なすぎると、粘着性が不十分になり、多過ぎると塗工性能が悪くなることがある。
本発明の一実施形態に係る粘着テープの製造方法は、上記ホットメルト粘着剤組成物を基材上に塗工する工程を含む。
SBBS:旭化成株式会社製 アサプレンN521
SIS:日本ゼオン株式会社製 クインタック3421
C5石油樹脂:日本ゼオン株式会社製 クイントンR100
C5C9石油樹脂:日本ゼオン株式会社製 クイントンS195
水添C9石油樹脂:荒川化学工業株式会社製 アルコンP-100
テルペンフェノール:ヤスハラケミカル株式会社製 YSポリスターT100
粘着テープの巻き戻しについては、粘着剤を塗布した基材を直径3インチの紙管に巻き取った後、20mm幅にカットし得られた粘着テープ捲重体から手でテープ基材を引きだせるかどうかを下記の基準にて判定した。その結果を表1及び表2に示す。
○:引き出すことが可能だった。
×:引き出す時に必要な力が大きく引き出すことができなかった。
JISZ0237 「10.粘着力」に従ってSUS板に対する180°ピール粘着力を測定した。その結果を表1及び表2に示す。
<保持力>
JISZ0237 「13.保持力」に従って測定した。被着体はSUS板を使用し、粘着テープの貼り付け面積は25mm×25mmとした。測定温度は60℃、荷重は1kgとして、おもりが落下するまでの時間を測定した。その結果を表1及び表2に示す。
Claims (7)
- スチレン系ブロック共重合体と、粘着付与剤と、可塑剤を含有し、
前記スチレン系ブロック共重合体は、スチレン-ブタジエンブロック共重合体であり、ブタジエン部分が部分的に水素添加されており、
前記スチレン系ブロック共重合体100質量部に対し、
前記粘着付与剤を、65~190質量部含み、
前記可塑剤を、0.1~24質量部含む、
ホットメルト粘着剤組成物。 - 前記粘着付与剤は、石油樹脂である、請求項1に記載のホットメルト粘着剤組成物。
- 前記石油樹脂は、C5石油樹脂、C5C9石油樹脂、及び水添C9石油樹脂からなる群から選ばれる少なくとも1つである、請求項2に記載のホットメルト粘着剤組成物。
- 前記可塑剤は、DINA(ジイソノニルアジペート)である、請求項1~請求項3の何れか1項に記載のホットメルト粘着剤組成物。
- 多孔質基材と、前記多孔質基材上に設けられた粘着剤層とを備え、
前記粘着剤層は、請求項1~請求項4の何れか1項に記載のホットメルト粘着剤組成物を含む、
粘着テープ。 - JIS Z0237 「10.粘着力」における粘着力が1.5N/cm以上であり、
JIS Z0237 「13.保持力」における保持力が10min以上である、
請求項5に記載の粘着テープ。 - 請求項5又は請求項6に記載の粘着テープの製造方法であって、
前記ホットメルト粘着剤組成物を前記基材上に非接触塗工方式により塗工する工程を含む、
粘着テープの製造方法。
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