WO2017146108A1 - 両面粘着テープ、車載部品固定用両面粘着テープ、及び、車載用ヘッドアップディスプレイカバー固定用両面粘着テープ - Google Patents
両面粘着テープ、車載部品固定用両面粘着テープ、及び、車載用ヘッドアップディスプレイカバー固定用両面粘着テープ Download PDFInfo
- Publication number
- WO2017146108A1 WO2017146108A1 PCT/JP2017/006639 JP2017006639W WO2017146108A1 WO 2017146108 A1 WO2017146108 A1 WO 2017146108A1 JP 2017006639 W JP2017006639 W JP 2017006639W WO 2017146108 A1 WO2017146108 A1 WO 2017146108A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- adhesive tape
- foam
- sensitive adhesive
- double
- weight
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
-
- 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
- C09J133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
-
- 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
- C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/241—Polyolefin, e.g.rubber
- C09J7/243—Ethylene or propylene polymers
-
- 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
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
-
- 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
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/24—Presence of a foam
- C09J2400/243—Presence of a foam in the substrate
-
- 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
- C09J2423/00—Presence of polyolefin
- C09J2423/04—Presence of homo or copolymers of ethene
- C09J2423/046—Presence of homo or copolymers of ethene in the substrate
-
- 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
- C09J2423/00—Presence of polyolefin
- C09J2423/10—Presence of homo or copolymers of propene
- C09J2423/106—Presence of homo or copolymers of propene in the substrate
-
- 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
- C09J2433/00—Presence of (meth)acrylic polymer
Definitions
- the present invention is excellent in heat resistance and repulsion resistance, particularly a double-sided pressure-sensitive adhesive tape that is difficult to peel off even when a cover of a vehicle-mounted panel or a vehicle-mounted head-up display is fixed, and a vehicle-mounted component fixing comprising the double-sided pressure-sensitive adhesive tape
- the present invention relates to a double-sided pressure-sensitive adhesive tape and a double-sided pressure-sensitive adhesive tape for fixing a vehicle head-up display cover.
- Double-sided pressure-sensitive adhesive tapes are used for fixing on-vehicle components to the vehicle body in vehicles such as automobiles.
- a fixed arrangement of components or a design of an apparatus main body has been studied so that components are not detached or damaged even when an impact is applied.
- As a double-sided pressure-sensitive adhesive tape used for fixing a vehicle-mounted component there is a demand for a double-sided pressure-sensitive adhesive tape that does not come off even when an impact is applied and does not apply a strong impact to the component.
- Patent Documents 1 and 2 have an acrylic pressure-sensitive adhesive layer laminated and integrated on at least one side of the base material layer, and the base material layer has a specific crosslinking degree and An impact absorbing tape made of a crosslinked polyolefin resin foam sheet having an aspect ratio of bubbles is described.
- parts are often peeled off when a conventional double-sided adhesive tape based on a foam sheet is used to fix covers for in-vehicle parts such as in-vehicle panels and head-up displays in recent years. was there.
- peeling of parts sometimes becomes a problem.
- the present inventor examined the cause of peeling when fixing a cover of an in-vehicle panel or an in-vehicle head-up display using a double-sided adhesive tape based on a conventional foam sheet. Focused on heat resistance. In-vehicle panels and in-vehicle head-up displays are generally installed under the windshield. Under such windshields, direct sunlight is applied, and in summer, temperatures of over 100 ° C. may be reached. In double-sided pressure-sensitive adhesive tapes based on conventional foamed sheets, the base material shrinks when exposed to such high temperatures, and as a result, the adhesive force is considered to have decreased and peeled off. It was.
- the present invention is excellent in heat resistance and resilience, and particularly difficult to peel even when fixing a cover of an in-vehicle panel or an in-vehicle head-up display, and the double-sided adhesive tape.
- An object of the present invention is to provide a double-sided pressure-sensitive adhesive tape for fixing a vehicle-mounted component and a double-sided pressure-sensitive adhesive tape for fixing a vehicle-mounted head-up display cover.
- the present invention is a double-sided pressure-sensitive adhesive tape having an acrylic pressure-sensitive adhesive layer on both surfaces of a substrate, wherein the substrate is made of a foam, and the thickness of the substrate is 1500 ⁇ m or less, and the foam is subjected to differential scanning.
- the crystal melting temperature peak measured by a calorimeter is 140 ° C. or higher, the expansion ratio is 15 cm 3 / g or less, and the bubble aspect ratio (average bubble diameter of MD / average bubble diameter of TD) is 0.9 to 3 is a double-sided pressure-sensitive adhesive tape.
- the present invention is described in detail below.
- the inventor used a foam as a base material in a double-sided pressure-sensitive adhesive tape having an acrylic pressure-sensitive adhesive layer on both sides of the base material, the crystal melting temperature peak of the foam, the expansion ratio, and the By adjusting the aspect ratio to a specific range, even a thin double-sided adhesive tape improves heat resistance and makes it difficult to peel off at high temperatures expected for automotive parts fixing applications, and applied to curved surfaces
- the present invention has been completed by finding out that it can exhibit repulsion resistance that is difficult to peel off.
- the double-sided pressure-sensitive adhesive tape of the present invention has an acrylic pressure-sensitive adhesive layer on both sides of the substrate.
- the substrate is made of a foam.
- the foam may be in the form of a sheet, for example.
- the foam has a crystal melting temperature peak measured by a differential scanning calorimeter of 140 ° C. or higher.
- the foaming ratio of the said foam is 15 cm ⁇ 3 > / g or less.
- the aspect ratio of the bubbles of the foam (average bubble diameter of MD / average bubble diameter of TD) is 0.9 to 3.
- the double-sided pressure-sensitive adhesive tape of the present invention exhibits high heat resistance and is difficult to peel off even at high temperatures assumed for use in fixing automotive parts, and is applied to curved surfaces. Repulsion resistance that is difficult to peel even when applied.
- the said foam is not specifically limited,
- a polyolefin foam can be used.
- a polyolefin foam containing a polyethylene resin or a polypropylene resin can be used.
- a polyolefin foam containing a polypropylene resin is preferable.
- the polypropylene resin is not particularly limited, and examples thereof include homopolypropylene, an ethylene-propylene random copolymer mainly containing propylene, and an ethylene-propylene block copolymer mainly containing propylene. These polypropylene resins may be used alone or in combination of two or more.
- an ethylene-propylene random copolymer containing propylene as a main component because the polyolefin foam obtained easily has both heat resistance and resilience resistance.
- an ethylene-propylene block copolymer containing propylene as a main component may be contained.
- the main component means that the propylene content in the copolymer is 50% by weight or more.
- the ethylene-propylene block copolymer is preferably such that the ethylene block portion and the propylene block portion have a sea-island structure, and the propylene block portion is a sea phase and the ethylene block portion is an island phase.
- the dispersion state of the ethylene block portion that is the island phase to the propylene block portion that is the sea phase is not particularly limited, but the distribution of the crosslinked structure of the resulting polyolefin foam becomes more uniform, and the strength and heat resistance Since the dispersibility and the like are uniform throughout the foam, the ethylene block portion is preferably dispersed as an island phase having an average particle size of 30 ⁇ m or less, more preferably the average particle size of the island phase is 10 ⁇ m or less, More preferably, the average particle size of the island phase is 3 ⁇ m or less, and particularly preferably the average particle size of the island phase is 1 ⁇ m or less.
- the average particle size of the dispersed state and the island phase of the ethylene block portion is measured by the following method. First, the ethylene block portion of the ethylene-propylene block copolymer is stained with ruthenium oxide, and a photomicrograph magnified 5000 to 50000 times is taken. The average particle size of the ethylene block portion is calculated by subjecting the photographed micrograph to image processing. In the present invention, the average particle size of the ethylene block portion is calculated using an image processing apparatus (trade name “HI-PIAS IV”) manufactured by Pierce.
- the elution amount of the polypropylene resin at 0 ° C. by the cloth fractionation method is not particularly limited, but the preferred lower limit is 1% by weight and the preferred upper limit is 50% by weight. When the elution amount at 0 ° C. is within this range, the heat resistance and resilience resistance of the resulting polyolefin foam can be further improved.
- the more preferable lower limit of the elution amount at 0 ° C. is 3% by weight, the more preferable upper limit is 30% by weight, the still more preferable lower limit is 5% by weight, and the still more preferable upper limit is 25% by weight.
- the cloth fractionation method is not particularly limited, but the preferred lower limit is 5% by weight and the preferred upper limit is 95% by weight.
- the heat resistance and resilience resistance of the resulting polyolefin foam can be further improved.
- the more preferable lower limit of the elution amount at 100 ° C. is 15% by weight, the more preferable lower limit is 30% by weight, and the particularly preferable lower limit is 50% by weight.
- the cross fractionation method is performed by the following method. First, a polypropylene resin is dissolved in o-dichlorobenzene at 140 ° C.
- the solution is cooled at a constant rate, and a thin polymer layer of polypropylene resin is formed on the surface of an inert carrier prepared in advance. , And in order of increasing crystallinity and increasing weight average molecular weight.
- the temperature is raised continuously or stepwise, the concentration of the sequentially eluted components is detected, and the composition distribution (crystallinity distribution) is measured.
- the weight average molecular weight and molecular weight distribution of the eluted polypropylene resin component are measured by high-temperature GPC, and the weight average molecular weight of the component eluted in a predetermined temperature range is calculated.
- the molecular weight distribution for each crystallinity distribution of the polypropylene resin can be measured from the above, and the elution amount in the predetermined temperature range and the weight average molecular weight in the range can be calculated.
- a cross-fractionation chromatograph apparatus manufactured by Mitsubishi Yuka Co., Ltd., trade name “CFC-T150A type” having the above-described system can be used.
- the melt flow rate (hereinafter also referred to as “MFR”) of the polypropylene resin is not particularly limited, but a preferable lower limit is 0.1 g / 10 minutes, and a preferable upper limit is 70 g / 10 minutes. When the MFR is within this range, the heat resistance of the resulting polyolefin foam can be further improved.
- a more preferable upper limit of the MFR is 50 g / 10 min or less, and a more preferable upper limit is 5 g / 10 min or less.
- MFR means a value measured under conditions of a temperature of 230 ° C. and a load of 21.2 N in accordance with JIS K 7210.
- the minimum with preferable content of the polypropylene resin of the said polyolefin foam is 30 weight%, and a preferable upper limit is 90 weight%.
- the content of the polypropylene resin is within this range, the obtained polyolefin foam can achieve both heat resistance and rebound resistance.
- the content of the polypropylene resin is less than 30% by weight, the obtained polyolefin foam cannot exhibit sufficient heat resistance, and when it exceeds 90% by weight, the obtained polyolefin foam becomes hard. When applied to a curved surface, it tends to repel and peel off.
- the minimum with more preferable content of the said polypropylene resin is 40 weight%, and a more preferable upper limit is 60 weight%.
- the polypropylene resin is made of a copolymer of propylene and another monomer
- propylene is introduced as a constituent unit of the copolymer in a proportion of 80% by weight or more
- the characteristics as polypropylene are In this case, the entire content of the copolymer is calculated as the polypropylene content.
- the polyolefin foam containing the polypropylene resin contains a polyolefin resin other than the polypropylene resin.
- the polyolefin resin other than the polypropylene resin is not particularly limited, and examples thereof include polyethylene, an ethylene-propylene copolymer containing ethylene as a main component, an olefin elastomer, and a styrene elastomer. Polyolefin resins other than these polypropylene resins may be used alone or in combination of two or more. Especially, since the heat resistance and resilience resistance of the obtained polyolefin foam improve more, polyethylene is preferable.
- the polyethylene is not particularly limited, and examples thereof include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, and ethylene- ⁇ -olefin copolymer containing ethylene as a main component. These polyethylenes may be used alone or in combination of two or more.
- MFR of polyolefin resin other than the said polypropylene resin is not specifically limited, A preferable minimum is 0.5 g / 10min and a preferable upper limit is 70 g / 10min. When the MFR is within this range, a highly heat-resistant polyolefin foam can be easily molded.
- the more preferable lower limit of the MFR is 1.5 g / 10 minutes, the more preferable upper limit is 50 g / 10 minutes, the still more preferable lower limit is 2 g / 10 minutes, and the still more preferable upper limit is 30 g / 10 minutes.
- the said polyolefin foam is a range which does not inhibit the effect of this invention, you may contain other resin besides polyolefin resin other than the said polypropylene resin and the said polypropylene resin.
- the crystal melting temperature peak measured by the differential scanning calorimeter of the foam is not particularly limited as long as it is 140 ° C. or higher, the preferred lower limit is 145 ° C., and the preferred upper limit is 175 ° C. When the crystal melting temperature peak is within this range, the heat resistance of the obtained foam can be further improved.
- the more preferable lower limit of the crystal melting temperature peak is 147 ° C.
- the still more preferable lower limit is 149 ° C.
- the particularly preferable lower limit is 152 ° C.
- the crystal melting temperature peak measured by the differential scanning calorimeter of the foam can be adjusted by the material of the foam, the expansion ratio, the thickness, and the like.
- the crystal melting temperature peak measured by a differential scanning calorimeter is a value obtained when 100 mg of a foam is measured in the atmosphere using a differential scanning calorimeter at a heating rate of 10 ° C./min.
- the peak temperature of Specifically, the differential scanning calorimeter can be, for example, a product name “220C” manufactured by Seiko Instruments Inc.
- the upper limit of the expansion ratio of the foam is 15 cm 3 / g.
- the expansion ratio of the foam is within this range, the resulting double-sided pressure-sensitive adhesive tape can achieve both high impact resistance and resilience resistance.
- the minimum of the foaming ratio of the said foam is not specifically limited, A preferable minimum is 3 cm ⁇ 3 > / g.
- the foaming ratio of the foam is less than 3 cm 3 / g, the repulsive force as a base material becomes too strong and the resilience resistance is lowered, and the resulting double-sided adhesive tape is easily peeled off when applied to a curved surface If it exceeds 15 cm 3 / g, the strength of the base material is insufficient, and when the double-sided pressure-sensitive adhesive tape obtained is applied to a curved surface, the base material may extend or crack in the thickness direction.
- the preferable lower limit of the expansion ratio of the foam is 4 cm 3 / g, the preferable upper limit is 8 cm 3 / g, the more preferable lower limit is 4.5 cm 3 / g, and the more preferable upper limit is 6 cm 3 / g.
- the expansion ratio of the foam can be adjusted by the material, thickness and the like of the foam.
- the expansion ratio of the foam can be calculated from the reciprocal of the density of the foam. For example, it can be measured according to JIS K 7222.
- the foam has an aspect ratio of bubbles (average bubble diameter of MD / average bubble diameter of TD) of 0.9 to 3.
- the aspect ratio of the bubbles that is, the ratio of the average bubble diameter of MD and the average bubble diameter of TD
- the foaming ratio is lowered and the resilience resistance is lowered, or the thickness, resilience resistance and tensile strength of the foam are reduced. Variation may occur.
- the aspect ratio of the bubbles is large, the resilience resistance of the foam is lowered.
- a preferable lower limit of the aspect ratio of the bubbles is 1.2, a preferable upper limit is 2, a more preferable lower limit is 1.4, and a more preferable upper limit is 1.5.
- the aspect ratio of the bubbles of the foam can be adjusted by the material of the foam, the expansion ratio, the thickness, and the like.
- the MD (Machine Direction) of the foam refers to the extrusion direction when the foam is extruded into a sheet
- the TD (Transverse Direction) of the foam refers to the thickness direction of the foam (based on the foam).
- the average cell diameter of MD of a foam means what was measured in the following way. That is, the foam is cut over the entire length at a plane parallel to the thickness direction at a substantially central portion in the TD. Thereafter, the cut surface of the foam is magnified 60 times using a scanning electron microscope (SEM), and a photograph is taken so that the entire length of the foam is accommodated.
- SEM scanning electron microscope
- the average cell diameter of TD of a foam means what was measured in the following way. That is, the foam is cut in the thickness direction at a plane parallel to the TD and parallel to the thickness direction of the foam. Thereafter, the cut surface of the foam is magnified 60 times using a scanning electron microscope (SEM), and a photograph is taken so that the entire length of the foam is accommodated. And based on the obtained photograph, the average bubble diameter of TD is calculated in the same manner as when the average bubble diameter of the foam MD is measured.
- SEM scanning electron microscope
- the bubble diameter is determined based only on the bubble cross section appearing on the photograph. That is, the bubbles may seem to be completely separated from each other by the bubble wall on the cut surface of the foam, but may be in communication with each other at a portion other than the cut surface of the foam.
- the bubble shape is determined based on only the bubble film cross section appearing on the photograph, and the bubbles appearing on the photograph One void part completely surrounded by the cross section of the film is judged as one bubble.
- Positioning on a straight line means that the straight line completely penetrates the bubble at any part of the bubble, and the straight line does not completely penetrate the bubble at both ends of the straight line. In the case where the end of is located in the bubble, this bubble is counted as 0.5.
- the foam preferably has no bubbles exposed on the surface in the thickness direction, and preferably has a skin layer on the surface in the thickness direction.
- the skin layer refers to a region that is a part of the foam, does not contain bubbles, and occupies a certain thickness from the surface of the foam. If a foam in which bubbles are exposed on the surface in the thickness direction or bubbles exposed on the surface are torn, the impact resistance and rebound resistance of the double-sided pressure-sensitive adhesive tape may be inferior.
- the foam preferably has a 25% compressive strength in the thickness direction of 50 kPa or more and 1000 kPa or less.
- the 25% compressive strength exceeds 1000 kPa, the resilience resistance of the foam is lowered, which is not preferable.
- the more preferable lower limit of the 25% compressive strength is 100 kPa, and the more preferable upper limit is 900 kPa.
- the 25% compressive strength in the thickness direction of the foam can be adjusted by the material of the foam, the expansion ratio, the thickness, and the like.
- the 25% compressive strength in the thickness direction of the foam can be measured according to JIS K6767-7.2.3 (JIS2009).
- Step (1) A resin component such as polyolefin resin other than polyolefin resin and polypropylene resin, a pyrolytic foaming agent, and other additives are supplied to an extruder and melt kneaded.
- the pyrolytic foaming agent to be blended in the polyolefin resin composition in the step (1) is not particularly limited, and examples thereof include azodicarbonamide, N, N′-dinitrosopentamethylenetetramine, p-toluenesulfonyl semicarbazide and the like. These decomposable foaming agents may be used alone or in combination of two or more. Of these, azodicarbonamide is preferable.
- content of the said pyrolyzable foaming agent is not specifically limited, The preferable minimum with respect to 100 weight part of resin components is 1 weight part, and a preferable upper limit is 12 weight part.
- a preferable upper limit is 12 weight part.
- the upper limit with more preferable content of the said pyrolyzable foaming agent is 8 weight part.
- Examples of other additives blended in the polyolefin resin composition include a decomposition temperature adjusting agent, a crosslinking aid, and an antioxidant.
- the said decomposition temperature regulator is mix
- Examples of the decomposition temperature adjusting agent include zinc oxide, zinc stearate, urea and the like.
- the minimum with preferable content of the said decomposition temperature regulator with respect to 100 weight part of said polyolefin resin is 0.01 weight part, and a preferable upper limit is 5 weight part.
- the crosslinking aid is blended in order to reduce ionizing radiation dose to be irradiated in the crosslinking of the polyolefin resin composition to be described later, and to prevent the resin molecules from being cut and deteriorated due to irradiation with ionizing radiation.
- a polyfunctional monomer etc. are mentioned, for example. Specifically, for example, three in one molecule such as trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, trimellitic acid triallyl ester, 1,2,4-benzenetricarboxylic acid triallyl ester, triallyl isocyanurate, etc.
- 2 functional groups in one molecule such as 1,6-hexanediol dimethacrylate, 1,9-nonanediol dimethacrylate, 1,10-decanediol dimethacrylate, divinylbenzene, etc.
- Examples include compounds, diallyl phthalate, diallyl terephthalate, diallyl isophthalate, ethyl vinyl benzene, neopentyl glycol dimethacrylate, lauryl methacrylate, stearyl methacrylate, and the like.
- These crosslinking aids may be used alone or in combination of two or more.
- the preferable minimum with respect to 100 weight part of resin components is 0.2 weight part, and a preferable upper limit is 10 weight part.
- a foam having a desired degree of crosslinking can be stably obtained, and the degree of crosslinking of the foam can be easily controlled.
- the more preferable lower limit of the addition amount of the crosslinking aid is 0.3 parts by weight, the more preferable upper limit is 5 parts by weight, and the still more preferable lower limit is 0.5 parts by weight.
- the antioxidant is blended to prevent oxidative deterioration due to heat.
- examples of the antioxidant include phenolic antioxidants such as 2,6-di-t-butyl-p-cresol.
- Examples of the method for crosslinking the polyolefin resin composition in the step (2) include a method of irradiating the polyolefin resin composition with ionizing radiation such as electron beam, ⁇ ray, ⁇ ray, and ⁇ ray, and a polyolefin resin composition.
- Examples of the method include a method in which an organic peroxide is blended in advance when forming the film, and then the organic peroxide is decomposed by heating the polyolefin resin composition. These methods may be used alone or in combination of two or more. Of these, the method of irradiating with ionizing radiation is preferable from the viewpoint of homogeneous crosslinking.
- the dose of ionizing radiation in the method of irradiating with ionizing radiation is preferably adjusted so that the gel fraction is 5 to 45% by weight.
- a specific irradiation amount is preferably 0.5 to 20 Mrad, and more preferably 3 to 12 Mrad.
- Examples of the organic peroxide in the method of previously blending an organic peroxide with the polyolefin resin composition include 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, 1,1 -Bis (t-butylperoxy) cyclohexane and the like. These organic peroxides may be used alone or in combination of two or more. As for the addition amount of the organic peroxide, a preferable lower limit with respect to 100 parts by weight of the resin component is 0.01 part by weight, and a preferable upper limit is 5 parts by weight.
- the more preferable lower limit of the addition amount of the organic peroxide is 0.1 parts by weight, and the more preferable upper limit is 3 parts by weight.
- the method of foaming the polyolefin resin composition is not particularly limited.
- the method of heating the polyolefin resin composition with hot air the method of heating with infrared rays, the method of heating with a salt bath, or heating with an oil bath.
- the method for foaming these polyolefin resin compositions may be used alone or in combination of two or more.
- the foaming method of polyolefin resin composition is not limited to the method of using a thermal decomposition type foaming agent, You may use physical foaming by a butane gas etc.
- the sheet-like polyolefin resin composition may be stretched in either one or both of MD and TD as necessary.
- the method of stretching the sheet-shaped polyolefin resin composition include a method of stretching the polyolefin resin composition after obtaining a foam, a method of stretching the foamed polyolefin resin composition, and the like.
- the polyolefin resin composition is foamed and stretched after obtaining the foam, it is preferable to continue stretching the foam while maintaining the molten state during foaming without cooling the foam.
- the cooled foam may be reheated to a molten or softened state and then stretched.
- the upper limit of the thickness of the substrate is 1500 ⁇ m. Even if the thickness of the substrate is as thin as this range, by adjusting the foam as described above, the resulting double-sided pressure-sensitive adhesive tape can achieve both high impact resistance and resilience resistance. .
- the minimum of the said base material is not specifically limited, A preferable minimum is 100 micrometers. When the thickness of the base material is less than 100 ⁇ m, the resulting double-sided pressure-sensitive adhesive tape may not exhibit sufficient impact resistance.
- the upper limit with preferable thickness of the said base material is 1000 micrometers. When the thickness of the base material exceeds 1000 ⁇ m, the resilience resistance is lowered, and the resulting double-sided pressure-sensitive adhesive tape may be easily peeled off when applied to a curved surface.
- a more preferable lower limit of the thickness of the substrate is 150 ⁇ m, a more preferable upper limit is 900 ⁇ m, a further preferable lower limit is 200 ⁇ m, and a still more preferable upper limit is 800 ⁇ m.
- the acrylic copolymer constituting the acrylic pressure-sensitive adhesive layer is not particularly limited, but is preferably obtained by copolymerizing a monomer mixture containing butyl acrylate and 2-ethylhexyl acrylate because high adhesive strength can be obtained.
- the preferable lower limit of the butyl acrylate content in the total monomer mixture is 40% by weight, and the preferable upper limit is 80% by weight. When the content of butyl acrylate is within this range, both high adhesive strength and cohesive strength can be achieved.
- the preferable lower limit of the content of 2-ethylhexyl acrylate in the total monomer mixture is 10% by weight, and the preferable upper limit is 40% by weight. When the content of 2-ethylhexyl acrylate is within this range, both high adhesive strength and cohesive strength can be achieved.
- the monomer mixture may contain other copolymerizable monomers other than butyl acrylate and 2-ethylhexyl acrylate as necessary.
- examples of other polymerizable monomers that can be copolymerized include, for example, carbon number of alkyl groups such as methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, and isopropyl (meth) acrylate.
- (Meth) acrylic acid alkyl ester having 1 to 3 carbon atoms such as (meth) acrylic acid alkyl ester, tridecyl methacrylate, stearyl (meth) acrylate, and the like, and (meth) acrylic acid hydroxyalkyl And functional monomers such as glycerin dimethacrylate, glycidyl (meth) acrylate, 2-methacryloyloxyethyl isocyanate, (meth) acrylic acid, itaconic acid, maleic anhydride, crotonic acid, maleic acid and fumaric acid.
- the monomer mixture may be radically reacted in the presence of a polymerization initiator.
- a method of radical reaction of the monomer mixture that is, a polymerization method
- examples thereof include solution polymerization (boiling point polymerization or constant temperature polymerization), emulsion polymerization, suspension polymerization, bulk polymerization and the like.
- the said polymerization initiator is not specifically limited, For example, an organic peroxide, an azo compound, etc. are mentioned.
- organic peroxide examples include 1,1-bis (t-hexylperoxy) -3,3,5-trimethylcyclohexane, t-hexylperoxypivalate, t-butylperoxypivalate, 2,5 -Dimethyl-2,5-bis (2-ethylhexanoylperoxy) hexane, t-hexylperoxy-2-ethylhexanoate, t-butylperoxy-2-ethylhexanoate, t-butylperoxy Examples include isobutyrate, t-butylperoxy-3,5,5-trimethylhexanoate, and t-butylperoxylaurate.
- the azo compound examples include azobisisobutyronitrile and azobiscyclohexanecarbonitrile. These polymerization initiators may be used alone or in combination of two or more.
- the weight average molecular weight (Mw) of the said acrylic copolymer a preferable minimum is 400,000 and a preferable upper limit is 1 million.
- the weight average molecular weight is less than 400,000, the cohesive force of the acrylic pressure-sensitive adhesive layer may be reduced, and the shear adhesive force of the double-sided pressure-sensitive adhesive tape may be reduced.
- a weight average molecular weight exceeds 1 million, the adhesive force of the said acrylic adhesive layer may fall, and the shear adhesive force of a double-sided adhesive tape may fall.
- a more preferable lower limit of the weight average molecular weight is 500,000, and a more preferable upper limit is 700,000.
- a weight average molecular weight is a weight average molecular weight of standard polystyrene conversion by GPC (Gel Permeation Chromatography: gel permeation chromatography).
- the acrylic pressure-sensitive adhesive layer may contain a tackifier resin.
- tackifier resins include rosin ester resins, hydrogenated rosin resins, terpene resins, terpene phenol resins, coumarone indene resins, alicyclic saturated hydrocarbon resins, C5 petroleum resins, and C9 resins. Examples include petroleum resins and C5-C9 copolymer petroleum resins. These tackifying resins may be used alone or in combination of two or more.
- content of the said tackifying resin is not specifically limited,
- the preferable minimum with respect to 100 weight part of said acrylic copolymers is 10 weight part, and a preferable upper limit is 60 weight part.
- a preferable upper limit is 60 weight part.
- a crosslinking structure is formed between the main chains of the resin (the acrylic copolymer and / or the tackifying resin) constituting the acrylic pressure-sensitive adhesive layer by adding a crosslinking agent.
- a crosslinking agent is not specifically limited, For example, an isocyanate type crosslinking agent, an aziridine type crosslinking agent, an epoxy-type crosslinking agent, a metal chelate type crosslinking agent etc. are mentioned. Of these, isocyanate-based crosslinking agents are preferred.
- the isocyanate group of the isocyanate-based cross-linking agent reacts with the alcoholic hydroxyl group in the resin constituting the acrylic pressure-sensitive adhesive layer, and the acrylic pressure-sensitive adhesive layer.
- the cross-linking becomes loose. Accordingly, the acrylic pressure-sensitive adhesive layer can disperse the intermittently applied peeling stress, and the shear adhesive strength of the double-sided pressure-sensitive adhesive tape is further improved.
- a preferable lower limit with respect to 100 parts by weight of the acrylic copolymer is 0.01 part by weight, a preferable upper limit is 10 parts by weight, a more preferable lower limit is 0.1 part by weight, and a more preferable upper limit is 3 parts. Parts by weight.
- the degree of cross-linking of the acrylic pressure-sensitive adhesive layer is preferably 5 to 40% by weight, because it may be easily peeled off from the adherend when a load in a large shear direction is applied, whether it is too high or too low. More preferred is 40% by weight, and particularly preferred is 15 to 35% by weight.
- the thickness of the said acrylic adhesive layer is not specifically limited,
- the preferable minimum of the thickness of the acrylic adhesive layer of one side is 10 micrometers, and a preferable upper limit is 100 micrometers.
- the thickness of the acrylic pressure-sensitive adhesive layer is within this range, both high adhesive strength and reworkability or removability can be achieved.
- the minimum with the preferable total thickness of a double-sided adhesive tape is 30 micrometers, and a preferable upper limit is 2000 micrometers.
- a preferable upper limit is 2000 micrometers.
- the minimum with more preferable total thickness of the said double-sided adhesive tape is 150 micrometers, and a more preferable upper limit is 1100 micrometers.
- the more preferable lower limit of the total thickness of the double-sided pressure-sensitive adhesive tape is 200 ⁇ m, and the more preferable upper limit is 900 ⁇ m.
- a solution of an adhesive A is prepared by adding a solvent to an acrylic copolymer, a tackifier resin, and a cross-linking agent as necessary, and the solution of the adhesive A is applied to the surface of the substrate.
- the acrylic adhesive layer A is formed by completely removing and removing the solvent.
- a release film is overlaid on the formed acrylic pressure-sensitive adhesive layer A so that the release treatment surface faces the acrylic pressure-sensitive adhesive layer A.
- a release film different from the above release film is prepared, the adhesive B solution is applied to the release treatment surface of the release film, and the solvent in the solution is completely removed by drying, thereby releasing the release film.
- a laminated film in which the acrylic pressure-sensitive adhesive layer B is formed on the surface of the mold film is produced.
- the obtained laminated film is superposed on the back surface of the base material on which the acrylic pressure-sensitive adhesive layer A is formed, with the acrylic pressure-sensitive adhesive layer B facing the back surface of the base material to produce a laminate.
- a double-sided pressure-sensitive adhesive tape having an acrylic pressure-sensitive adhesive layer on both surfaces of the base material and having the surface of the acrylic pressure-sensitive adhesive layer covered with a release film can be obtained. it can.
- two sets of laminated films are produced in the same manner, and a laminated body is produced by superposing these laminated films on both sides of the base material with the acrylic adhesive layer of the laminated film facing the base material. Then, by pressing this laminate with a rubber roller or the like, a double-sided pressure-sensitive adhesive tape having an acrylic pressure-sensitive adhesive layer on both surfaces of the base material and the surface of the acrylic pressure-sensitive adhesive layer covered with a release film can be obtained. Good.
- the double-sided pressure-sensitive adhesive tape of the present invention can exhibit excellent heat resistance due to the above-described configuration, and is used for fixing an in-vehicle component that is exposed to direct sunlight under a windshield such as a cover of an in-vehicle panel or an in-vehicle head-up display. Also difficult to peel off. Moreover, since the double-sided pressure-sensitive adhesive tape of the present invention is also excellent in repulsion resistance, even when applied to a curved surface of a design that uses a large number of curved surfaces with excellent design properties such as recent automotive panels and automotive head-up displays. Hard to peel. Although the use of the double-sided pressure-sensitive adhesive tape of the present invention is not particularly limited, it can be used for fixing parts of transportation equipment.
- the double-sided pressure-sensitive adhesive tape of the present invention can also be suitably held for fixing components constituting a portable electronic device.
- the double-sided pressure-sensitive adhesive tape of the present invention can be suitably used for bonding and fixing components in a large-sized portable electronic device.
- the shape of the double-sided pressure-sensitive adhesive tape of the present invention in these applications is not particularly limited, and examples thereof include a rectangle, a frame shape, a circle, an ellipse, and a donut shape.
- ADVANTAGE OF THE INVENTION According to this invention, it is excellent in heat resistance and resilience resistance, especially the double-sided adhesive tape which is hard to peel even when fixing the cover of a vehicle-mounted panel or a vehicle-mounted head-up display, and the vehicle-mounted component consisting of this double-sided pressure-sensitive adhesive tape
- a double-sided pressure-sensitive adhesive tape for fixing and a double-sided pressure-sensitive adhesive tape for fixing a vehicle head-up display cover can be provided.
- Example 1 Preparation of polyolefin foam Polypropylene resin (ethylene-propylene random copolymer: manufactured by Sumitomo Chemical Co., Ltd., trade name “AD571”, density 0.90 g / cm 3 , MFR 0.5 g / 10 min) 80 parts by weight A resin component consisting of 20 parts by weight of linear low density polyethylene (manufactured by Tosoh Corporation, trade name “ZF231”, MFR 2 g / 10 min, density 0.917 g / cm 3 ), and azodicarbonamide (thermal decomposition type foaming agent) ) 7.5 parts by weight and 3 parts by weight of divinylbenzene (crosslinking aid), 0.3 parts by weight of 2,6-di-t-butyl-p-cresol (antioxidant), dilaurylthiopro A polyolefin resin composition obtained by adding 0.3 parts by weight of pionate (antioxidant) and 0.5 parts by weight of methylbenzotriazole (met
- the raw sheet is cross-linked by irradiating 1.5 Mrad of an electron beam with an acceleration voltage of 800 kV on both sides, and then continuously fed into a foaming furnace maintained at 250 ° C. by hot air and an infrared heater.
- a foaming furnace maintained at 250 ° C. by hot air and an infrared heater.
- the expansion ratio of the obtained polyolefin foam was calculated from the density measured using an electronic hydrometer (trade name “ED120T”) manufactured by Mirage in accordance with JISK-6767. Further, the crystal melting temperature peak, the bubble aspect ratio, and the 25% compressive strength of the obtained polyolefin foam were determined.
- the weight average molecular weight of the obtained acrylic copolymer was measured by a GPC method using “2690 Separations Model” manufactured by Water as a column, it was 710,000. 15 parts by weight of polymerized rosin ester having a softening point of 150 ° C. and 125 parts by weight of ethyl acetate (produced by Fuji Chemical Co., Ltd.) with respect to 100 parts by weight of the solid content of the acrylic copolymer contained in the obtained acrylic copolymer solution Part, 1.5 parts by weight of an isocyanate-based crosslinking agent (trade name “Coronate L45” manufactured by Nippon Polyurethane Co., Ltd.) was added and stirred to obtain an adhesive.
- an isocyanate-based crosslinking agent trade name “Coronate L45” manufactured by Nippon Polyurethane Co., Ltd.
- a release paper having a thickness of 150 ⁇ m is prepared, an adhesive is applied to the release-treated surface of this release paper, and dried at 100 ° C. for 5 minutes, whereby an acrylic pressure-sensitive adhesive layer having a thickness of 50 ⁇ m is formed. Formed. This acrylic pressure-sensitive adhesive layer was bonded to the surface of the polyolefin foam. Next, in the same manner, the same acrylic pressure-sensitive adhesive layer as above was bonded to the opposite surface of the polyolefin foam. Thereafter, curing was carried out by heating at 40 ° C. for 48 hours to obtain a double-sided pressure-sensitive adhesive tape.
- Example 2 A polyolefin foam was obtained in the same manner as in Example 1 except that azodicarbonamide (pyrolytic foaming agent) was changed to 7 parts by weight. A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the obtained polyolefin foam was used.
- azodicarbonamide pyrolytic foaming agent
- Example 3 Polypropylene resin (ethylene-propylene random copolymer: manufactured by Sumitomo Chemical Co., Ltd., trade name “AD571”, density 0.90 g / cm 3 , MFR 0.5 g / 10 min) 70 parts by weight, linear low density polyethylene ( Example except that Tosoh Corporation, trade name “ZF231”, MFR 2 g / 10 min, density 0.917 g / cm 3 ) was changed to 30 parts by weight, and azodicarbonamide (pyrolytic foaming agent) was changed to 7 parts by weight.
- a polyolefin foam was obtained.
- a double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the obtained polyolefin foam was used.
- Example 4 Polypropylene resin (ethylene-propylene random copolymer: manufactured by Sumitomo Chemical Co., Ltd., trade name “AD571”, density 0.90 g / cm 3 , MFR 0.5 g / 10 min) 60 parts by weight, linear low density polyethylene ( Made by Tosoh Corporation, trade name “ZF231”, MFR 2 g / 10 min, density 0.917 g / cm 3 ) was changed to 40 parts by weight, and azodicarbonamide (thermal decomposition type foaming agent) was changed to 3.8 parts by weight.
- a polyolefin foam having a thickness of 500 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the sheet was changed to 300 ⁇ m.
- a double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the obtained polyolefin foam was used.
- Example 5 Polypropylene resin (ethylene-propylene random copolymer: manufactured by Sumitomo Chemical Co., Ltd., trade name “AD571”, density 0.90 g / cm 3 , MFR 0.5 g / 10 min) 60 parts by weight, linear low density polyethylene ( Made by Tosoh Corporation, trade name “ZF231”, MFR 2 g / 10 min, density 0.917 g / cm 3 ) was changed to 40 parts by weight, and azodicarbonamide (thermal decomposition foaming agent) was changed to 3.5 parts by weight.
- a polyolefin foam having a thickness of 200 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the sheet was 150 ⁇ m.
- a double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the obtained polyolefin foam was used.
- Example 6 Polypropylene resin (ethylene-propylene random copolymer: manufactured by Sumitomo Chemical Co., Ltd., trade name “AD571”, density 0.90 g / cm 3 , MFR 0.5 g / 10 min) 70 parts by weight, linear low density polyethylene ( Made by Tosoh Corporation, trade name “ZF231”, MFR 2 g / 10 min, density 0.917 g / cm 3 ) was changed to 30 parts by weight, and azodicarbonamide (thermal decomposition foaming agent) was changed to 3.0 parts by weight.
- a polyolefin foam having a thickness of 500 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the sheet was 400 ⁇ m.
- a double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the obtained polyolefin foam was used.
- Example 7 Polypropylene resin (ethylene-propylene random copolymer: manufactured by Sumitomo Chemical Co., Ltd., trade name “AD571”, density 0.90 g / cm 3 , MFR 0.5 g / 10 min) 40 parts by weight, linear low density polyethylene ( Made by Tosoh Corporation, trade name “ZF231”, MFR 2 g / 10 min, density 0.917 g / cm 3 ) was changed to 60 parts by weight, and azodicarbonamide (thermal decomposition foaming agent) was changed to 4.5 parts by weight.
- a polyolefin foam having a thickness of 800 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the sheet was changed to 400 ⁇ m.
- a double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the obtained polyolefin foam was used.
- Example 1 Polypropylene resin (ethylene-propylene random copolymer: manufactured by Sumitomo Chemical Co., Ltd., trade name “AD571”, density 0.90 g / cm 3 , MFR 0.5 g / 10 min) 70 parts by weight, linear low density polyethylene ( Made by Tosoh Corporation, trade name “ZF231”, MFR 2 g / 10 min, density 0.917 g / cm 3 ) was changed to 30 parts by weight and azodicarbonamide (thermal decomposition type foaming agent) to 4.5 parts by weight.
- a polyolefin foam having a thickness of 400 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the sheet was 200 ⁇ m.
- a double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the obtained polyolefin foam was used.
- Example 2 Polypropylene resin (ethylene-propylene random copolymer: manufactured by Sumitomo Chemical Co., Ltd., trade name “AD571”, density 0.90 g / cm 3 , MFR 0.5 g / 10 min) 0 part by weight, linear low density polyethylene ( Made by Tosoh Corporation, trade name “ZF231”, MFR 2 g / 10 min, density 0.917 g / cm 3 ) was changed to 100 parts by weight, and azodicarbonamide (thermal decomposition foaming agent) was changed to 4.5 parts by weight.
- a polyolefin foam having a thickness of 800 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the sheet was changed to 400 ⁇ m.
- a double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the obtained polyolefin foam was used.
- Example 3 Polypropylene resin (ethylene-propylene random copolymer: manufactured by Sumitomo Chemical Co., Ltd., trade name “AD571”, density 0.90 g / cm 3 , MFR 0.5 g / 10 min) 0 part by weight, linear low density polyethylene ( Made by Tosoh Corporation, trade name “ZF231”, MFR 2 g / 10 min, density 0.917 g / cm 3 ) was changed to 100 parts by weight, and azodicarbonamide (thermal decomposition foaming agent) was changed to 2.2 parts by weight.
- a polyolefin foam having a thickness of 100 ⁇ m was obtained in the same manner as in Example 1 except that the thickness of the sheet was 170 ⁇ m.
- a double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the obtained polyolefin foam was used.
- the obtained double-sided pressure-sensitive adhesive tape was cut into a square shape having a length of 10 mm and a width of 10 mm so that MD and TD would be sides, and used as a sample.
- the obtained sample was placed in an oven adjusted to 110 ° C. for 500 hours, then taken out and naturally cooled to 23 ° C.
- the length of each side of the sample after the heat treatment was measured, and the shrinkage rate due to the heat treatment was calculated.
- a case where the shrinkage rate was 5% or less in both MD and TD was evaluated as “ ⁇ ”, and a case where the shrinkage rate exceeded 5% in either or both of MD and TD was evaluated as “x”.
- the obtained double-sided pressure-sensitive adhesive tape was cut into a rectangular shape having a length of 150 mm and a width of 25 mm so that MD was a side in the vertical direction and TD was a side in the horizontal direction.
- One side of the obtained sample was bonded to a polycarbonate plate having a length of 150 mm, a width of 25 mm, and a thickness of 1 mm, and the other side was further bonded to a polycarbonate plate having a length of 200 mm, a width of 25 mm, and a thickness of 1 mm, and one round reciprocating with a 2 kg roller. And left for 24 hours.
- test piece was bent and fixed so as to be 200 mm to 190 mm in length and used as a sample.
- the sample was placed in an oven adjusted to 110 ° C. for 500 hours and observed, no occurrence of “floating” was observed, “ ⁇ ”, and when “floating” was observed even in part, “ ⁇ ” ".
- another test piece is prepared in the same manner, and is bent and fixed so as to be 200 mm to 165 mm in length and used as a sample, and the occurrence of “floating” is evaluated in the same manner as described above. did.
- ADVANTAGE OF THE INVENTION According to this invention, it is excellent in heat resistance and resilience resistance, especially the double-sided adhesive tape which is hard to peel even when fixing the cover of a vehicle-mounted panel or a vehicle-mounted head-up display, and the vehicle-mounted component consisting of this double-sided pressure-sensitive adhesive tape
- a double-sided pressure-sensitive adhesive tape for fixing and a double-sided pressure-sensitive adhesive tape for fixing a vehicle head-up display cover can be provided.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Adhesive Tapes (AREA)
- Laminated Bodies (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Description
以下に本発明を詳述する。
上記基材は、発泡体からなる。上記発泡体は、例えばシート状であってもよい。
上記発泡体は、示差走査熱量計により測定される結晶融解温度ピークが140℃以上である。また、上記発泡体の発泡倍率は15cm3/g以下である。また、上記発泡体の気泡のアスペクト比(MDの平均気泡径/TDの平均気泡径)は、0.9~3である。このような発泡体を基材として用いることにより、本発明の両面粘着テープは、高い耐熱性を発揮して車載部品の固定用途にて想定される高温下でも剥離しにくく、かつ、曲面に適用したときにでも剥離しにくい耐反発性を発揮することができる。
上記ポリオレフィン発泡体としては、ポリエチレン系樹脂やポリプロピレン系樹脂を含有するポリオレフィン発泡体を用いることができる。なかでも、ポリプロピレン系樹脂を含有するポリオレフィン発泡体が好ましい。
上記ポリプロピレン系樹脂は特に限定されず、例えば、ホモポリプロピレン、プロピレンを主成分とするエチレン-プロピレンランダム共重合体、プロピレンを主成分とするエチレン-プロピレンブロック共重合体等が挙げられる。これらのポリプロピレン系樹脂は単独で用いてもよく、2種以上を併用してもよい。なかでも、得られるポリオレフィン発泡体の耐熱性及び耐反発性を両立しやすくことから、プロピレンを主成分とするエチレン-プロピレンランダム共重合体を含有することが好ましい。また、耐寒性向上の観点から、プロピレンを主成分とするエチレン-プロピレンブロック共重合体を含有してもよい。
なお、ここで主成分とするとは共重合体中のプロピレン含有量が50重量%以上であることを意味する。
まず、酸化ルテニウムによりエチレン-プロピレンブロック共重合体のエチレンブロック部分を染色し、5000~50000倍に拡大された顕微鏡写真を撮影する。この撮影した顕微鏡写真を画像処理することによりエチレンブロック部分の平均粒径を算出する。本発明では、ピアス社製の画像処理装置(商品名「HI-PIAS IV」)を用いてエチレンブロック部分の平均粒径を算出する。
上記ポリプロピレン系樹脂のクロス分別法による100℃での溶出量は特には限定されないが、好ましい下限は5重量%、好ましい上限は95重量%である。上記100℃での溶出量がこの範囲内であると、得られるポリオレフィン発泡体の耐熱性と耐反発性とをより向上させることができる。上記100℃での溶出量のより好ましい下限は15重量%、更に好ましい下限は30重量%、特に好ましい下限は50重量%である。
なお、クロス分別法は、以下の方法により行われる。
まず、ポリプロピレン系樹脂を140℃のo-ジクロロベンゼンに溶解して溶液とし、該溶液を一定速度で冷却して、予め用意しておいた不活性担体表面に、ポリプロピレン系樹脂の薄いポリマー層を、結晶性の高い順及び重量平均分子量の大きい順に生成させる。次に、温度を連続的又は段階的に昇温し、順次溶出した成分の濃度を検出し、組成分布(結晶性分布)を測定する。同時に、溶出したポリプロピレン系樹脂成分の重量平均分子量及び分子量分布を高温型GPCで測定し、所定温度範囲で溶出した成分の重量平均分子量を算出する。
従って、上記からポリプロピレン系樹脂の結晶化度分布毎の分子量分布を測定することができ、所定温度範囲での溶出量と該範囲での重量平均分子量を算出することができる。具体的には例えば、上述のようなシステムを備えているクロス分別クロマトグラフ装置(三菱油化社製、商品名「CFC-T150A型」等)を用いることができる。
なお、本明細書においてMFRは、JIS K 7210に準拠して、温度230℃、荷重21.2Nの条件下で測定した値を意味する。
なお、上記ポリプロピレン系樹脂が、プロピレンと他のモノマーとの共重合体からなる場合、プロピレンが80重量%以上の割合で共重合体の構成単位として導入されている場合は、ポリプロピレンとしての特性が強く現れるので、この場合、本発明においては共重合体の含有量全体をポリプロピレンの含有量として算出するものとする。
上記ポリプロピレン系樹脂以外のポリオレフィン系樹脂としては特には限定されないが、例えば、ポリエチレン、エチレンを主成分とするエチレン-プロピレン共重合体、オレフィン系エラストマー、スチレン系エラストマー等が挙げられる。これらのポリプロピレン系樹脂以外のポリオレフィン系樹脂は単独で用いてもよく、2種以上を併用してもよい。なかでも、得られるポリオレフィン発泡体の耐熱性及び耐反発性がより向上することから、ポリエチレンが好ましい。
上記発泡体の示差走査熱量計により測定される結晶融解温度ピークは、上記発泡体の材料、発泡倍率、厚み等により調整することができる。
なお、本明細書において示差走査熱量計により測定される結晶融解温度ピークとは、発泡体100mgを示差走査熱量計を用いて大気中において昇温速度10℃/分の条件下で測定された際のピーク温度を意味する。上記示差走査熱量計は、具体的には例えば、セイコーインスツルメンツ社製の商品名「220C」等を用いることができる。
上記発泡体の発泡倍率は、上記発泡体の材料、厚み等により調整することができる。
なお、上記発泡体の発泡倍率は、上記発泡体の密度の逆数から算出できる。例えば、JIS K 7222に準拠して測定することができる。
上記発泡体の気泡のアスペクト比は、上記発泡体の材料、発泡倍率、厚み等により調整することができる。
MDの平均気泡径(μm)=2500(μm)/気泡数(個)
上記発泡体の厚さ方向の25%圧縮強度は、上記発泡体の材料、発泡倍率、厚み等により調整することができる。
なお、上記発泡体の厚さ方向の25%圧縮強度は、JIS K6767-7.2.3(JIS2009)に準拠して測定することができる。
工程(1):ポリオレフィン系樹脂及びポリプロピレン系樹脂以外のポリオレフィン系樹脂等の樹脂成分、熱分解型発泡剤、並びに、その他の添加剤を押出機に供給して溶融混練し、押出機からシート状に押出すことによってシート状にされたポリオレフィン樹脂組成物を得る工程
工程(2):シート状にされたポリオレフィン樹脂組成物を架橋する工程
工程(3):架橋させたシート状のポリオレフィン樹脂組成物を加熱し、熱分解型発泡剤を発泡させる工程
上記分解温度調整剤は、熱分解型発泡剤の分解温度を低くしたり、分解速度を速めたりすることで、発泡体の表面状態等を調整するものとして配合されるものである。上記分解温度調整剤としては、例えば、酸化亜鉛、ステアリン酸亜鉛、尿素等が挙げられる。
上記ポリオレフィン系樹脂100重量部に対する上記分解温度調整剤の含有量の好ましい下限は0.01重量部、好ましい上限は5重量部である。
上記架橋助剤としては、例えば、多官能モノマー等が挙げられる。具体的には例えば、トリメチロールプロパントリメタクリレート、トリメチロールプロパントリアクリレート、トリメリット酸トリアリルエステル、1,2,4-ベンゼントリカルボン酸トリアリルエステル、トリアリルイソシアヌレート等の1分子中に3個の官能基を持つ化合物や、1,6-ヘキサンジオールジメタクリレート、1,9-ノナンジオールジメタクリレート、1,10-デカンジオールジメタクリレート、ジビニルベンゼン等の1分子中に2個の官能基を持つ化合物、フタル酸ジアリル、テレフタル酸ジアリル、イソフタル酸ジアリル、エチルビニルベンゼン、ネオペンチルグリコールジメタクリレート、ラウリルメタクリレート、ステアリルメタクリレート等が挙げられる。これらの架橋助剤は単独で用いてもよく、2種類以上を組み合わせて用いてもよい。
上記架橋助剤の添加量は、樹脂成分100重量部に対する好ましい下限が0.2重量部、好ましい上限が10重量部である。上記架橋助剤の添加量がこの範囲内であると、所望の架橋度を持つ発泡体を安定して得ることができ、また、発泡体の架橋度の制御を容易にすることができる。上記架橋助剤の添加量のより好ましい下限は0.3重量部、より好ましい上限は5重量部であり、更に好ましい下限は0.5重量部である。
上記有機過酸化物の添加量は、樹脂成分100重量部に対する好ましい下限が0.01重量部、好ましい上限が5重量部である。上記有機過酸化物の添加量がこの範囲内であると、樹脂組成物の架橋が進行しやすく、また、得られるポリオレフィン発泡体中に存在する有機過酸化物の分解残渣の量を抑制することができる。上記有機過酸化物の添加量のより好ましい下限は0.1重量部、より好ましい上限は3重量部である。
上記シート状のポリオレフィン樹脂組成物を延伸する方法としては、ポリオレフィン樹脂組成物を発泡させて、発泡体を得た後に延伸する方法や、ポリオレフィン樹脂組成物を発泡させつつ延伸する方法等が挙げられる。なお、ポリオレフィン樹脂組成物を発泡させて、発泡体を得た後に延伸を行う場合には、発泡体を冷却することなく発泡時の溶融状態を維持したまま続けて発泡体を延伸したほうが好ましいが、冷却した発泡体を再度加熱して、溶融又は軟化状態とした後に発泡体を延伸してもよい。
全モノマー混合物に占めるブチルアクリレートの含有量の好ましい下限は40重量%、好ましい上限は80重量%である。ブチルアクリレートの含有量がこの範囲内であると、高い粘着力と凝集力とを両立することができる。
全モノマー混合物に占める2-エチルヘキシルアクリレートの含有量の好ましい下限は10重量%、好ましい上限は40重量%である。2-エチルヘキシルアクリレートの含有量がこの範囲内であると、高い粘着力と凝集力とを両立することができる。
上記共重合可能な他の重合性モノマーとして、例えば、(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸n-プロピル、(メタ)アクリル酸イソプロピル等のアルキル基の炭素数が1~3の(メタ)アクリル酸アルキルエステル、メタクリル酸トリデシル、(メタ)アクリル酸ステアリル等のアルキル基の炭素数が13~18の(メタ)アクリル酸アルキルエステル、(メタ)アクリル酸ヒドロキシアルキル、グリセリンジメタクリレート、(メタ)アクリル酸グリシジル、2-メタクリロイルオキシエチルイソシアネート、(メタ)アクリル酸、イタコン酸、無水マレイン酸、クロトン酸、マレイン酸、フマル酸等の官能性モノマーが挙げられる。
上記重合開始剤は特に限定されず、例えば、有機過酸化物、アゾ化合物等が挙げられる。上記有機過酸化物として、例えば、1,1-ビス(t-ヘキシルパーオキシ)-3,3,5-トリメチルシクロヘキサン、t-ヘキシルパーオキシピバレート、t-ブチルパーオキシピバレート、2,5-ジメチル-2,5-ビス(2-エチルヘキサノイルパーオキシ)ヘキサン、t-ヘキシルパーオキシ-2-エチルヘキサノエート、t-ブチルパーオキシ-2-エチルヘキサノエート、t-ブチルパーオキシイソブチレート、t-ブチルパーオキシ-3,5,5-トリメチルヘキサノエート、t-ブチルパーオキシラウレート等が挙げられる。上記アゾ化合物として、例えば、アゾビスイソブチロニトリル、アゾビスシクロヘキサンカルボニトリル等が挙げられる。これらの重合開始剤は単独で用いてもよいし、2種以上を併用してもよい。
重量平均分子量を上記範囲に調整するためには、重合開始剤、重合温度等の重合条件を調整すればよい。
なお、重量平均分子量(Mw)とは、GPC(Gel Permeation Chromatography:ゲルパーミエーションクロマトグラフィ)による標準ポリスチレン換算の重量平均分子量である。
上記粘着付与樹脂として、例えば、ロジンエステル系樹脂、水添ロジン系樹脂、テルペン系樹脂、テルペンフェノール系樹脂、クマロンインデン系樹脂、脂環族飽和炭化水素系樹脂、C5系石油樹脂、C9系石油樹脂、C5-C9共重合系石油樹脂等が挙げられる。これらの粘着付与樹脂は単独で用いてもよいし、2種以上を併用してもよい。
上記架橋剤は特に限定されず、例えば、イソシアネート系架橋剤、アジリジン系架橋剤、エポキシ系架橋剤、金属キレート型架橋剤等が挙げられる。なかでも、イソシアネート系架橋剤が好ましい。上記アクリル粘着剤層にイソシアネート系架橋剤が添加されることで、イソシアネート系架橋剤のイソシアネート基と上記アクリル粘着剤層を構成する樹脂中のアルコール性水酸基とが反応して、上記アクリル粘着剤層の架橋が緩くなる。従って、上記アクリル粘着剤層は、断続的に加わる剥離応力を分散させることができ、両面粘着テープのせん断粘着力がより向上する。
上記架橋剤の添加量は、上記アクリル共重合体100重量部に対する好ましい下限が0.01重量部、好ましい上限が10重量部であり、より好ましい下限が0.1重量部、より好ましい上限が3重量部である。
なお、アクリル粘着剤層の架橋度は、アクリル粘着剤層をW1(g)採取し、このアクリル粘着剤層を酢酸エチル中に23℃にて24時間浸漬して不溶解分を200メッシュの金網で濾過し、金網上の残渣を真空乾燥して乾燥残渣の重量W2(g)を測定し、下記式(1)により算出する。
架橋度(重量%)=100×W2/W1 (1)
まず、アクリル共重合体、粘着付与樹脂、必要に応じて架橋剤等に溶剤を加えて粘着剤Aの溶液を作製して、この粘着剤Aの溶液を基材の表面に塗布し、溶液中の溶剤を完全に乾燥除去してアクリル粘着剤層Aを形成する。次に、形成されたアクリル粘着剤層Aの上に離型フィルムをその離型処理面がアクリル粘着剤層Aに対向した状態に重ね合わせる。
次いで、上記離型フィルムとは別の離型フィルムを用意し、この離型フィルムの離型処理面に粘着剤Bの溶液を塗布し、溶液中の溶剤を完全に乾燥除去することにより、離型フィルムの表面にアクリル粘着剤層Bが形成された積層フィルムを作製する。得られた積層フィルムをアクリル粘着剤層Aが形成された基材の裏面に、アクリル粘着剤層Bが基材の裏面に対向した状態に重ね合わせて積層体を作製する。そして、上記積層体をゴムローラ等によって加圧することによって、基材の両面にアクリル粘着剤層を有し、かつ、アクリル粘着剤層の表面が離型フィルムで覆われた両面粘着テープを得ることができる。
また、本発明の両面粘着テープは、耐反発性にも優れることから、近年の車載用パネルや車載用ヘッドアップディスプレイ等の意匠性に優れた曲面を多用したデザインの曲面に適用した場合にでも剥離しにくい。本発明の両面粘着テープの用途は特に限定されないが、輸送機器の部品固定に用いることができる。なかでも、車載部品固定用両面粘着テープ、とりわけ車載用パネルカバー固定用両面粘着テープや車載用ヘッドアップディスプレイカバー固定用両面粘着テープとして特に好適である。
本発明の両面粘着テープは、また、携帯電子機器を構成する部品の固定にも好適に持ち鶴ことができる。具体的には例えば、大型の携帯電子機器における部品の接着固定にも本発明の両面粘着テープを好適に用いることができる。
これらの用途における本発明の両面粘着テープの形状は特に限定されないが、長方形、額縁状、円形、楕円形、ドーナツ型等が挙げられる。
(1)ポリオレフィン発泡体の調製
ポリプロピレン系樹脂(エチレン-プロピレンランダム共重合体:住友化学社製、商品名「AD571」、密度0.90g/cm3、MFR0.5g/10分)80重量部と、直鎖状低密度ポリエチレン(東ソー社製、商品名「ZF231」、MFR2g/10分、密度0.917g/cm3)20重量部とからなる樹脂成分に、アゾジカルボンアミド(熱分解型発泡剤)7.5重量部及びジビニルベンゼン(架橋助剤)3重量部を添加し、更に2,6-ジ-t-ブチル-p-クレゾール(酸化防止剤)0.3重量部、ジラウリルチオプロピオネート(酸化防止剤)0.3重量部、及び、メチルベンゾトリアゾール(金属害防止剤)0.5重量部を添加して得たポリオレフィン樹脂組成物を、単軸押出機により、温度185℃で溶融混練して、厚み600μmの原反シートとして押出した。
得られたポリオレフィン発泡体の発泡倍率を、JISK-6767に準拠してミラージュ社製の電子比重計(商品名「ED120T」)を使用して測定した密度から算出した。また、得られたポリオレフィン発泡体の結晶融解温度ピーク、気泡アスペクト比、及び、25%圧縮強度を求めた。
得られたアクリル共重合体の溶液に含まれるアクリル共重合体の固形分100重量部に対して、軟化点150℃の重合ロジンエステル15重量部、酢酸エチル(不二化学薬品社製)125重量部、イソシアネート系架橋剤(日本ポリウレタン社製 商品名「コロネートL45」)1.5重量部を添加し、攪拌して、粘着剤を得た。
厚み150μmの離型紙を用意し、この離型紙の離型処理面に粘着剤を塗布し、100℃で5分間乾燥させることにより、厚み50μmのアクリル粘着剤層を形成した。このアクリル粘着剤層を、ポリオレフィン発泡体の表面と貼り合わせた。次いで、同様の要領で、このポリオレフィン発泡体の反対の表面にも上記と同じアクリル粘着剤層を貼り合わせた。その後40℃で48時間加熱することで養生を行い、両面粘着テープを得た。
アゾジカルボンアミド(熱分解型発泡剤)を7重量部に変更したこと以外は実施例1と同様にしてポリオレフィン発泡体を得た。
得られたポリオレフィン発泡体を用いた以外は実施例1と同様にして両面粘着テープを得た。
ポリプロピレン系樹脂(エチレン-プロピレンランダム共重合体:住友化学社製、商品名「AD571」、密度0.90g/cm3、MFR0.5g/10分)を70重量部、直鎖状低密度ポリエチレン(東ソー社製、商品名「ZF231」、MFR2g/10分、密度0.917g/cm3)を30重量部、アゾジカルボンアミド(熱分解型発泡剤)を7重量部に変更したこと以外は実施例1と同様にしてポリオレフィン発泡体を得た。
得られたポリオレフィン発泡体を用いた以外は実施例1と同様にして両面粘着テープを得た。
ポリプロピレン系樹脂(エチレン-プロピレンランダム共重合体:住友化学社製、商品名「AD571」、密度0.90g/cm3、MFR0.5g/10分)を60重量部、直鎖状低密度ポリエチレン(東ソー社製、商品名「ZF231」、MFR2g/10分、密度0.917g/cm3)を40重量部、アゾジカルボンアミド(熱分解型発泡剤)を3.8重量部に変更し、原反シートの厚みを300μmにしたこと以外は実施例1と同様にして、厚さ500μmのポリオレフィン発泡体を得た。
得られたポリオレフィン発泡体を用いた以外は実施例1と同様にして両面粘着テープを得た。
ポリプロピレン系樹脂(エチレン-プロピレンランダム共重合体:住友化学社製、商品名「AD571」、密度0.90g/cm3、MFR0.5g/10分)を60重量部、直鎖状低密度ポリエチレン(東ソー社製、商品名「ZF231」、MFR2g/10分、密度0.917g/cm3)を40重量部、アゾジカルボンアミド(熱分解型発泡剤)を3.5重量部に変更し、原反シートの厚みを150μmにしたこと以外は実施例1と同様にして、厚さ200μmのポリオレフィン発泡体を得た。
得られたポリオレフィン発泡体を用いた以外は実施例1と同様にして両面粘着テープを得た。
ポリプロピレン系樹脂(エチレン-プロピレンランダム共重合体:住友化学社製、商品名「AD571」、密度0.90g/cm3、MFR0.5g/10分)を70重量部、直鎖状低密度ポリエチレン(東ソー社製、商品名「ZF231」、MFR2g/10分、密度0.917g/cm3)を30重量部、アゾジカルボンアミド(熱分解型発泡剤)を3.0重量部に変更し、原反シートの厚みを400μmにしたこと以外は実施例1と同様にして、厚さ500μmのポリオレフィン発泡体を得た。
得られたポリオレフィン発泡体を用いた以外は実施例1と同様にして両面粘着テープを得た。
ポリプロピレン系樹脂(エチレン-プロピレンランダム共重合体:住友化学社製、商品名「AD571」、密度0.90g/cm3、MFR0.5g/10分)を40重量部、直鎖状低密度ポリエチレン(東ソー社製、商品名「ZF231」、MFR2g/10分、密度0.917g/cm3)を60重量部、アゾジカルボンアミド(熱分解型発泡剤)を4.5重量部に変更し、原反シートの厚みを400μmにしたこと以外は実施例1と同様にして、厚さ800μmのポリオレフィン発泡体を得た。
得られたポリオレフィン発泡体を用いた以外は実施例1と同様にして両面粘着テープを得た。
ポリプロピレン系樹脂(エチレン-プロピレンランダム共重合体:住友化学社製、商品名「AD571」、密度0.90g/cm3、MFR0.5g/10分)を70重量部、直鎖状低密度ポリエチレン(東ソー社製、商品名「ZF231」、MFR2g/10分、密度0.917g/cm3)を30重量部、アゾジカルボンアミド(熱分解型発泡剤)を4.5重量部に変更し、原反シートの厚みを200μmにしたこと以外は実施例1と同様にして、厚さ400μmのポリオレフィン発泡体を得た。
得られたポリオレフィン発泡体を用いた以外は実施例1と同様にして両面粘着テープを得た。
ポリプロピレン系樹脂(エチレン-プロピレンランダム共重合体:住友化学社製、商品名「AD571」、密度0.90g/cm3、MFR0.5g/10分)を0重量部、直鎖状低密度ポリエチレン(東ソー社製、商品名「ZF231」、MFR2g/10分、密度0.917g/cm3)を100重量部、アゾジカルボンアミド(熱分解型発泡剤)を4.5重量部に変更し、原反シートの厚みを400μmにしたこと以外は実施例1と同様にして、厚さ800μmのポリオレフィン発泡体を得た。
得られたポリオレフィン発泡体を用いた以外は実施例1と同様にして両面粘着テープを得た。
ポリプロピレン系樹脂(エチレン-プロピレンランダム共重合体:住友化学社製、商品名「AD571」、密度0.90g/cm3、MFR0.5g/10分)を0重量部、直鎖状低密度ポリエチレン(東ソー社製、商品名「ZF231」、MFR2g/10分、密度0.917g/cm3)を100重量部、アゾジカルボンアミド(熱分解型発泡剤)を2.2重量部に変更し、原反シートの厚みを170μmにしたこと以外は実施例1と同様にして、厚さ100μmのポリオレフィン発泡体を得た。
得られたポリオレフィン発泡体を用いた以外は実施例1と同様にして両面粘着テープを得た。
ポリプロピレン系樹脂(エチレン-プロピレンランダム共重合体:住友化学社製、商品名「AD571」、密度0.90g/cm3、MFR0.5g/10分)を70重量部、直鎖状低密度ポリエチレン(東ソー社製、商品名「ZF231」、MFR2g/10分、密度0.917g/cm3)を30重量部、アゾジカルボンアミド(熱分解型発泡剤)を13重量部に変更し、原反シートの厚みを400μmにしたこと以外は実施例1と同様にして、厚さ1000μmのポリオレフィン発泡体を得た。
得られたポリオレフィン発泡体を用いた以外は実施例1と同様にして両面粘着テープを得た。
実施例、比較例で得られた両面粘着テープについて以下の評価を行った。結果を表1に示した。
得られた両面粘着テープを、MD及びTDが辺になるように縦10mm、横10mmの正方形状に切り出してサンプルとした。
得られたサンプルを、110℃に調整したオーブン中に500時間置いた後、取り出して23℃にまで自然冷却した。
熱処理後のサンプルの各辺の長さを測定し、熱処理による収縮率を算出した。MD及びTDともに収縮率が5%以下であった場合を「○」と、MD及びTDのいずれか又は両方において収縮率が5%を超えた場合を「×」と評価した。
また、「○」と評価された場合については同様にサンプルをもうひとつ作製し、120℃に調整したオーブン中に500時間置いた後、取り出して23℃にまで自然冷却し、上記と同様にして収縮率を評価した。120℃の熱処理でもMD及びTDともに収縮率が5%以下であった場合を「◎」、110℃ではMD及びTDともに収縮率が5%以下であったが120℃ではMD及びTDのいずれか又は両方において収縮率が5%を超えた場合を「○」、と評価した。
得られた両面粘着テープを、MDが縦方向の辺、TDが横方向の辺になるように縦150mm、横25mmの長方形状に切り出した。得られたサンプルの片面を、縦150mm、横25mm、厚み1mmのポリカーボネート板に貼り合わせ、更にもう片面を縦200mm、横25mm、厚み1mmのポリカーボネート板に貼り合わせ、2kgのローラーで1往復圧着し、24時間静置した。その後、試験片を縦200mmから190mmになるように曲げて固定し、サンプルとした。
サンプルを110℃に調整したオーブン中に500時間置き、観察して、「浮き」の発生が全く認められなかった場合を「○」、一部にでも「浮き」が認められた場合を「×」と評価した。
また、「○」と評価された場合については同様に試験片をもうひとつ作製し、縦200mmから165mmになるように曲げて固定し、サンプルとし、上記と同様にして「浮き」の発生を評価した。165mmまで曲げても「浮き」の発生が全く認められなかった場合を「◎」、190mmまで曲げた際は「浮き」の発生が全く認められなかったが165mmまで曲げた際は一部にでも「浮き」が認められた場合を「○」と評価した。
Claims (7)
- 基材の両面にアクリル粘着剤層を有する両面粘着テープであって、
前記基材は、発泡体からなり、
前記基材の厚みが1500μm以下であり、
前記発泡体は、示差走査熱量計により測定される結晶融解温度ピークが140℃以上であり、発泡倍率が15cm3/g以下であり、気泡のアスペクト比(MDの平均気泡径/TDの平均気泡径)が0.9~3である
ことを特徴とする両面粘着テープ。 - 前記発泡体は、ポリプロピレン系樹脂を30~90重量%含有するポリオレフィン発泡体であることを特徴とする請求項1記載の両面粘着テープ。
- 前記ポリプロピレン系樹脂は、プロピレンを主成分とするエチレン-プロピレンランダム共重合体であることを特徴とする請求項2記載の両面粘着テープ。
- 前記発泡体は、厚さ方向の25%圧縮強度が50~1000kPaであることを特徴とする請求項1、2又は3記載の両面粘着テープ。
- 総厚みが30~2000μmであることを特徴とする請求項1、2、3又は4記載の両面粘着テープ。
- 請求項1、2、3、4又は5記載の両面粘着テープからなることを特徴とする車載部品固定用両面粘着テープ。
- 請求項1、2、3、4又は5記載の両面粘着テープからなることを特徴とする車載用ヘッドアップディスプレイカバー固定用両面粘着テープ。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL17756546.2T PL3421566T3 (pl) | 2016-02-22 | 2017-02-22 | Dwustronna taśma klejąca, dwustronna taśma klejąca do mocowania komponentu montowanego w pojeździe i dwustronna taśma klejąca do montowanej w pojeździe osłony wyświetlacza head-up |
JP2017514589A JP6370477B2 (ja) | 2016-02-22 | 2017-02-22 | 両面粘着テープ、車載部品固定用両面粘着テープ、及び、車載用ヘッドアップディスプレイカバー固定用両面粘着テープ |
CN201780002047.3A CN107709490B (zh) | 2016-02-22 | 2017-02-22 | 双面粘合带、车载部件固定用双面粘合带及车载用平视显示器保护罩固定用双面粘合带 |
EP17756546.2A EP3421566B1 (en) | 2016-02-22 | 2017-02-22 | Two-sided adhesive tape, two-sided adhesive tape for vehicle-mounted component fixation, and two-sided adhesive tape for vehicle-mounted head-up display cover |
KR1020187001217A KR102642645B1 (ko) | 2016-02-22 | 2017-02-22 | 양면 점착 테이프, 차재 부품 고정용 양면 점착 테이프, 및, 차재용 헤드업 디스플레이 커버 고정용 양면 점착 테이프 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016031017 | 2016-02-22 | ||
JP2016-031017 | 2016-02-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017146108A1 true WO2017146108A1 (ja) | 2017-08-31 |
Family
ID=59686230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2017/006639 WO2017146108A1 (ja) | 2016-02-22 | 2017-02-22 | 両面粘着テープ、車載部品固定用両面粘着テープ、及び、車載用ヘッドアップディスプレイカバー固定用両面粘着テープ |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP3421566B1 (ja) |
JP (2) | JP6370477B2 (ja) |
KR (1) | KR102642645B1 (ja) |
CN (1) | CN107709490B (ja) |
HU (1) | HUE064920T2 (ja) |
PL (1) | PL3421566T3 (ja) |
WO (1) | WO2017146108A1 (ja) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018116844A1 (ja) * | 2016-12-22 | 2018-06-28 | Dic株式会社 | 粘着テープ |
JP2019026824A (ja) * | 2017-07-31 | 2019-02-21 | 日東電工株式会社 | 両面粘着シート |
JP2019044181A (ja) * | 2017-08-30 | 2019-03-22 | 積水化学工業株式会社 | 粘着テープ |
JP2019059819A (ja) * | 2017-09-26 | 2019-04-18 | 積水化学工業株式会社 | ポリオレフィン系樹脂発泡シート及びそれを用いた粘着テープ |
JP2019059932A (ja) * | 2017-09-27 | 2019-04-18 | 積水化学工業株式会社 | ポリオレフィン系樹脂発泡シート及びそれを用いた粘着テープ |
JP2019065213A (ja) * | 2017-10-03 | 2019-04-25 | Dic株式会社 | 発泡体基材粘着テープ、物品及び電子機器 |
WO2019124405A1 (ja) * | 2017-12-19 | 2019-06-27 | 積水化学工業株式会社 | 両面粘着テープ |
JP2020002232A (ja) * | 2018-06-27 | 2020-01-09 | Dic株式会社 | 粘着テープ |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102642645B1 (ko) * | 2016-02-22 | 2024-02-29 | 세키스이가가쿠 고교가부시키가이샤 | 양면 점착 테이프, 차재 부품 고정용 양면 점착 테이프, 및, 차재용 헤드업 디스플레이 커버 고정용 양면 점착 테이프 |
KR20210129046A (ko) * | 2019-02-25 | 2021-10-27 | 세키스이가가쿠 고교가부시키가이샤 | 양면 점착 테이프, 전자 기기 부품 및 전자 기기 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004182897A (ja) * | 2002-12-04 | 2004-07-02 | Sekisui Chem Co Ltd | 架橋ポリオレフィン系樹脂発泡体 |
JP2004204154A (ja) * | 2002-12-26 | 2004-07-22 | Sekisui Chem Co Ltd | 架橋ポリオレフィン系樹脂発泡体及びその製造方法 |
JP2012214626A (ja) * | 2011-03-31 | 2012-11-08 | Sekisui Chem Co Ltd | 架橋ポリオレフィン系樹脂発泡シート及びそれを用いた粘着テープ |
WO2013154137A1 (ja) * | 2012-04-13 | 2013-10-17 | Dic株式会社 | 粘着テープ |
JP2015155528A (ja) * | 2014-01-15 | 2015-08-27 | 日東電工株式会社 | 両面粘着シート |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8084509B2 (en) * | 2004-11-22 | 2011-12-27 | Kaneka Corporation | Pre-expanded particulate polypropylene-based resin and in-mold expansion molded article |
KR20130092638A (ko) * | 2005-05-18 | 2013-08-20 | 도레이 카부시키가이샤 | 가교 폴리올레핀계 수지 발포체 |
JP2009242541A (ja) | 2008-03-31 | 2009-10-22 | Sekisui Chem Co Ltd | 衝撃吸収テープ |
JP5249625B2 (ja) | 2008-04-15 | 2013-07-31 | 積水化学工業株式会社 | 表示装置前板用粘着シート |
CN103665421B (zh) * | 2012-08-31 | 2016-04-27 | 积水化成品工业株式会社 | 聚烯烃系树脂薄层发泡片材及其制造方法和用途 |
WO2015046526A1 (ja) * | 2013-09-30 | 2015-04-02 | 積水化学工業株式会社 | 架橋ポリオレフィン系樹脂発泡シート |
JP6361911B2 (ja) * | 2014-04-11 | 2018-07-25 | Dic株式会社 | 粘着テープ |
US10125201B2 (en) * | 2014-09-30 | 2018-11-13 | Sekisui Chemical Co., Ltd. | Polyolefin resin foam sheet and adhesive tape |
KR102642645B1 (ko) | 2016-02-22 | 2024-02-29 | 세키스이가가쿠 고교가부시키가이샤 | 양면 점착 테이프, 차재 부품 고정용 양면 점착 테이프, 및, 차재용 헤드업 디스플레이 커버 고정용 양면 점착 테이프 |
-
2017
- 2017-02-22 KR KR1020187001217A patent/KR102642645B1/ko active IP Right Grant
- 2017-02-22 PL PL17756546.2T patent/PL3421566T3/pl unknown
- 2017-02-22 CN CN201780002047.3A patent/CN107709490B/zh active Active
- 2017-02-22 WO PCT/JP2017/006639 patent/WO2017146108A1/ja active Application Filing
- 2017-02-22 HU HUE17756546A patent/HUE064920T2/hu unknown
- 2017-02-22 JP JP2017514589A patent/JP6370477B2/ja active Active
- 2017-02-22 EP EP17756546.2A patent/EP3421566B1/en active Active
-
2018
- 2018-07-02 JP JP2018125934A patent/JP7211723B2/ja active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004182897A (ja) * | 2002-12-04 | 2004-07-02 | Sekisui Chem Co Ltd | 架橋ポリオレフィン系樹脂発泡体 |
JP2004204154A (ja) * | 2002-12-26 | 2004-07-22 | Sekisui Chem Co Ltd | 架橋ポリオレフィン系樹脂発泡体及びその製造方法 |
JP2012214626A (ja) * | 2011-03-31 | 2012-11-08 | Sekisui Chem Co Ltd | 架橋ポリオレフィン系樹脂発泡シート及びそれを用いた粘着テープ |
WO2013154137A1 (ja) * | 2012-04-13 | 2013-10-17 | Dic株式会社 | 粘着テープ |
JP2015155528A (ja) * | 2014-01-15 | 2015-08-27 | 日東電工株式会社 | 両面粘着シート |
Non-Patent Citations (1)
Title |
---|
See also references of EP3421566A4 * |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2018116844A1 (ja) * | 2016-12-22 | 2019-10-24 | Dic株式会社 | 粘着テープ |
WO2018116844A1 (ja) * | 2016-12-22 | 2018-06-28 | Dic株式会社 | 粘着テープ |
JP2019026824A (ja) * | 2017-07-31 | 2019-02-21 | 日東電工株式会社 | 両面粘着シート |
JP7197983B2 (ja) | 2017-07-31 | 2022-12-28 | 日東電工株式会社 | 両面粘着シート |
JP2019044181A (ja) * | 2017-08-30 | 2019-03-22 | 積水化学工業株式会社 | 粘着テープ |
JP7128062B2 (ja) | 2017-08-30 | 2022-08-30 | 積水化学工業株式会社 | 粘着テープ |
JP2019059819A (ja) * | 2017-09-26 | 2019-04-18 | 積水化学工業株式会社 | ポリオレフィン系樹脂発泡シート及びそれを用いた粘着テープ |
JP7100968B2 (ja) | 2017-09-26 | 2022-07-14 | 積水化学工業株式会社 | ポリオレフィン系樹脂発泡シート及びそれを用いた粘着テープ |
JP7295623B2 (ja) | 2017-09-27 | 2023-06-21 | 積水化学工業株式会社 | ポリオレフィン系樹脂発泡シート及びそれを用いた粘着テープ |
JP2019059932A (ja) * | 2017-09-27 | 2019-04-18 | 積水化学工業株式会社 | ポリオレフィン系樹脂発泡シート及びそれを用いた粘着テープ |
JP2019065213A (ja) * | 2017-10-03 | 2019-04-25 | Dic株式会社 | 発泡体基材粘着テープ、物品及び電子機器 |
JP7003545B2 (ja) | 2017-10-03 | 2022-01-20 | Dic株式会社 | 発泡体基材粘着テープ、物品及び電子機器 |
WO2019124405A1 (ja) * | 2017-12-19 | 2019-06-27 | 積水化学工業株式会社 | 両面粘着テープ |
JPWO2019124405A1 (ja) * | 2017-12-19 | 2020-10-22 | 積水化学工業株式会社 | 両面粘着テープ |
JP7157047B2 (ja) | 2017-12-19 | 2022-10-19 | 積水化学工業株式会社 | 両面粘着テープ |
JP2020002232A (ja) * | 2018-06-27 | 2020-01-09 | Dic株式会社 | 粘着テープ |
JP7107026B2 (ja) | 2018-06-27 | 2022-07-27 | Dic株式会社 | 粘着テープ |
Also Published As
Publication number | Publication date |
---|---|
HUE064920T2 (hu) | 2024-04-28 |
JP7211723B2 (ja) | 2023-01-24 |
JP2018154849A (ja) | 2018-10-04 |
JP6370477B2 (ja) | 2018-08-08 |
EP3421566A4 (en) | 2019-10-02 |
KR102642645B1 (ko) | 2024-02-29 |
KR20180111757A (ko) | 2018-10-11 |
CN107709490A (zh) | 2018-02-16 |
PL3421566T3 (pl) | 2024-03-25 |
EP3421566B1 (en) | 2023-11-29 |
JPWO2017146108A1 (ja) | 2018-03-01 |
EP3421566A1 (en) | 2019-01-02 |
CN107709490B (zh) | 2022-06-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6370477B2 (ja) | 両面粘着テープ、車載部品固定用両面粘着テープ、及び、車載用ヘッドアップディスプレイカバー固定用両面粘着テープ | |
WO2017131082A1 (ja) | 両面粘着テープ | |
WO2016052556A1 (ja) | ポリオレフィン系樹脂発泡シート及び粘着テープ | |
JP5534854B2 (ja) | 電子機器用粘着シート | |
JP7323360B2 (ja) | 両面粘着テープ | |
WO2016052557A1 (ja) | ポリオレフィン系樹脂発泡シート及び粘着テープ | |
JP2010215906A (ja) | 電子機器用粘着シート | |
WO2017094723A1 (ja) | ポリオレフィン系樹脂発泡シート及び粘着テープ | |
JP6523725B2 (ja) | 両面粘着テープ | |
CN106232757B (zh) | 双面粘合带 | |
WO2017126135A1 (ja) | 両面粘着テープ | |
JP7128062B2 (ja) | 粘着テープ | |
WO2016052399A1 (ja) | 両面粘着テープ | |
JP2016069611A (ja) | 両面粘着テープ | |
WO2017171068A1 (ja) | 架橋ポリオレフィン樹脂発泡シート及びその製造方法 | |
WO2017171063A1 (ja) | 架橋ポリオレフィン樹脂発泡シート及びその製造方法 | |
JP6460788B2 (ja) | 粘着シート | |
JP2016125044A (ja) | 両面粘着テープ | |
JP2017066303A (ja) | 両面粘着テープ、電子機器部品固定用両面粘着テープ及び車載部品固定用両面粘着テープ | |
CN113490728B (zh) | 双面粘合带、电子设备部件及电子设备 | |
JP2021028386A (ja) | 両面粘着テープ | |
JP2019065301A (ja) | 粘着シート |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2017514589 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20187001217 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2017756546 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2017756546 Country of ref document: EP Effective date: 20180924 |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 17756546 Country of ref document: EP Kind code of ref document: A1 |