WO2021201044A1 - Feuille de mousse - Google Patents

Feuille de mousse Download PDF

Info

Publication number
WO2021201044A1
WO2021201044A1 PCT/JP2021/013707 JP2021013707W WO2021201044A1 WO 2021201044 A1 WO2021201044 A1 WO 2021201044A1 JP 2021013707 W JP2021013707 W JP 2021013707W WO 2021201044 A1 WO2021201044 A1 WO 2021201044A1
Authority
WO
WIPO (PCT)
Prior art keywords
foam sheet
mass
sheet
thickness
impact resistance
Prior art date
Application number
PCT/JP2021/013707
Other languages
English (en)
Japanese (ja)
Inventor
晶啓 浜田
石田　昌也
大輝 松川
萌 経田
Original Assignee
積水化学工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=77930371&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2021201044(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by 積水化学工業株式会社 filed Critical 積水化学工業株式会社
Priority to JP2021535121A priority Critical patent/JP6974655B1/ja
Publication of WO2021201044A1 publication Critical patent/WO2021201044A1/fr
Priority to JP2021179057A priority patent/JP2022023200A/ja

Links

Images

Classifications

    • 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
    • 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
    • C08J9/06—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 by a chemical 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
    • 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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]

Definitions

  • the present invention relates to a foam sheet, for example, a foam sheet used as a cushioning material for a display.
  • a cushioning material may be arranged on the back side of the display device in order to prevent damage or failure.
  • the cushion material is required to have high flexibility, and a foam sheet has been widely used conventionally.
  • the housings of devices have become larger.
  • uses other than those used in the past such as smartphones and tablets that are used while carrying around, and wall-mounted TVs that are installed in commercial facilities. As a result, the risk of dropping the device is increasing, and the risk of destruction between the panel and the housing is also increasing.
  • the adhesive area between the screen and the housing is becoming smaller as the screen size is increased. Therefore, the width of the adhesive tape that separates the outside from the inside is narrowed, and moisture easily enters the inside. Further, in addition to this, even if the material has impact resistance, which has not been a problem until now, the shortage of impact resistance becomes apparent due to the narrowing of the width of the tape.
  • the above-mentioned acrylic foam is a material with high impact resistance, it has high water vapor permeability, and the invading moisture causes corrosion (rust generation, etc.) of the metal used for electronic devices, causing malfunctions and failures. May cause.
  • the foam sheet used for these equipment has excellent low-speed impact resistance. Desired.
  • the impact resistance against dropping and impact from the outside is high-speed impact resistance, and there is a demand for a foam sheet having both low-speed impact resistance and high-speed impact resistance.
  • the above-mentioned acrylic foam is a material having excellent high-speed impact resistance, but has low impact resistance at low speeds, and is not suitable for fixing a wall-mounted television, for example.
  • the above-mentioned acrylic foam is a material with high impact resistance, it is complicated to handle because it has high flexibility and high tackiness, and especially blocking measures are required.
  • As a blocking measure and a method of reinforcing mechanical strength a method of laminating with a resin sheet is taken, but when laminating a foam sheet and a resin sheet, a roll-to-roll format is adopted from the viewpoint of productivity. In many cases, transport tension is applied during bonding. Foam sheets with high flexibility are deformed and stretched with low stress, so they shrink after bonding, and there are problems such as peeling and wrinkling due to the difference in shrinkage with the resin sheet. ..
  • the above-mentioned acrylic foam is a material having high impact resistance, it has a high tack property, so that it has difficulty in handling.
  • the acrylic film (acrylic foam) has high tackiness, there is a problem that it adheres to a production machine, and there is a problem that the foam sheet is twisted during use and becomes unusable. ..
  • the followability will be inferior, and when used in an electronic device or the like, floating will occur, causing problems such as a decrease in airtightness. It is possible to make it.
  • an object of the present invention is to provide a foam sheet having excellent low moisture permeability and high impact resistance.
  • Another object of the present invention is to provide a foam sheet having both high-speed impact resistance and low-speed impact resistance.
  • Another object of the present invention is to provide a foam sheet having high impact resistance and tensile properties suitable for handling.
  • Another object of the present invention is to provide a foam sheet having high handling performance while maintaining high impact resistance.
  • the present inventors have found that the above problems can be solved by setting the glass transition temperature (Tg) and the loss tangent (tan ⁇ ) within a certain range and keeping the moisture permeability below a certain value.
  • the present invention (first invention) has been completed. Further, they have found that the above problems can be solved by setting the glass transition temperature (Tg) and the loss tangent (tan ⁇ ) within a certain range and setting the interlayer strength to a certain value or more, and the present invention (second invention). was completed.
  • the present invention provides the following [1] to [15].
  • the glass transition temperature (Tg) is -60 to 0 ° C.
  • the peak value of loss tangent (tan ⁇ ) is 0.25 or more
  • the moisture vapor transmission rate (WVTR) is 200 g / m 2 ⁇ day or less.
  • the glass transition temperature (Tg) is -60 to 0 ° C.
  • the peak value of loss tangent (tan ⁇ ) is 0.25 or more
  • the interlayer strength in the tensile test at a speed of 100 mm / min is 2.00 MPa.
  • the foam sheet that is above.
  • the foam sheet according to the first invention of the present invention is a foam sheet having excellent low moisture permeability and high impact resistance.
  • the foam sheet according to the second aspect of the present invention is a foam sheet having both high-speed impact resistance and low-speed impact resistance.
  • the foam sheet according to the third invention of the present invention is a foam sheet having high impact resistance and excellent handleability.
  • the foam sheet according to the fourth invention of the present invention is a foam sheet having high impact resistance and excellent handleability.
  • the foam sheet according to the first aspect of the present invention has a glass transition temperature (Tg) of ⁇ 60 to 0 ° C., a peak value of loss tangent (tan ⁇ ) of 0.25 or more, and moisture permeability (WVTR). ) Is 200 g / m 2 ⁇ day or less.
  • the foam sheet according to the second invention of the present invention has a glass transition temperature (Tg) of ⁇ 60 to 0 ° C., a peak value of loss tangent (tan ⁇ ) of 0.25 or more, and a speed of 100 mm.
  • the interlayer strength in the tensile test at / min is 2.00 MPa or more.
  • the foam sheet according to the third invention of the present invention has a glass transition temperature (Tg) of ⁇ 60 to 0 ° C., a peak value of loss tangent (tan ⁇ ) of 0.25 or more, and tensile strength. In the test, when the stress in the tensile direction is 0.06 N / 10 mm, the elongation in the tensile direction is 4% or less.
  • the foam sheet according to the fourth aspect of the present invention has a glass transition temperature (Tg) of ⁇ 60 to 0 ° C., a peak value of loss tangent (tan ⁇ ) of 0.25 or more, and a surface surface. It is characterized in that the tackiness of is 5000 gf / cm 2 or less.
  • the foam sheet of the present invention has a glass transition temperature (hereinafter sometimes referred to as “Tg”) of ⁇ 60 to 0 ° C.
  • Tg glass transition temperature
  • Tg is preferably in the range of ⁇ 30 ° C. to ⁇ 5 ° C., and more preferably in the range of ⁇ 25 ° C. to ⁇ 10 ° C.
  • Tg the temperature at the peak top of the loss tangent (tan ⁇ ) obtained by viscoelasticity measurement was defined as Tg.
  • Tg glass transition temperature
  • the peak value of loss tangent (hereinafter referred to as "tan ⁇ ") measured by dynamic viscoelasticity measurement at a measurement frequency of 10 Hz is 0.25 or more in the range of -60 to 0 ° C. Is. tan ⁇ is the ratio (G ′′ / G ′) of the storage shear modulus (G ′) to the loss shear modulus (G ′′), and how much energy the material absorbs when the material is deformed (heat). Will it change to?).
  • the peak value of tan ⁇ is 0.25 or more, the foam sheet of the present invention can exhibit excellent impact resistance, particularly excellent high-speed impact resistance.
  • the peak value of tan ⁇ is preferably 0.40 or more, and more preferably 0.50 or more.
  • the Tg and the loss tangent (tan ⁇ ) are values measured by the method described in the examples.
  • the peak value of tan ⁇ at that Tg is within the above range.
  • the Tg is within the above temperature range
  • the peak value of tan ⁇ at that Tg is within the above range.
  • the foam sheet of the present invention (particularly, the foam sheet according to the first invention) preferably has a water vapor transmission rate (WVTR: Water Vapor Transmission Rate) of 200 g / m 2 ⁇ day or less.
  • WVTR Water Vapor Transmission Rate
  • the moisture permeability is 200 g / m 2 ⁇ day or less, it is possible to prevent the invasion of moisture into the inside of the electronic device or the like.
  • the moisture permeability is preferably 100 g / m 2 ⁇ day or less, and more preferably 70 g / m 2 ⁇ day or less.
  • the lower limit is not particularly limited, but is usually about 5 g / m 2 ⁇ day.
  • the moisture permeability is a value measured by the method described in the examples.
  • the foam sheet of the present invention (particularly the foam sheet according to the second invention) preferably has an interlayer strength of 2.00 MPa or more in a tensile test at a speed of 100 mm / min.
  • the interlayer strength is 2.00 MPa or more, excellent low-speed impact resistance can be exhibited.
  • the interlayer strength is preferably 2.15 MPa or more, more preferably 2.20 MPa or more.
  • the upper limit is not particularly limited, but is usually about 6.00 MPa.
  • the interlayer strength is a value measured by the method described in Examples.
  • the foam sheet of the present invention (particularly, the foam sheet according to the third invention) preferably has an elongation in the tensile direction of 4% or less when the stress in the tensile direction is 0.06 N / 10 mm in a tensile test. ..
  • the elongation is more preferably 3.5% or less, and further preferably 3% or less.
  • the lower limit value is not particularly limited, but is preferably 0.3% or more from the viewpoint of obtaining sufficient impact resistance.
  • the elongation in the tensile direction is a value measured by the method described in the examples.
  • the foam sheet of the present invention (particularly, the foam sheet according to the fourth invention) preferably has a surface tack property of 5000 gf / cm 2 or less.
  • the tack property is 5000 gf / cm 2 or less
  • the handleability of the foam sheet is improved in the manufacturing process, and the productivity can be improved.
  • tackiness of the surface is preferably at 4500gf / cm 2 or less, more preferably 4000gf / cm 2 or less, and more preferably 3500gf / cm 2 or less.
  • the tackiness of the surface of the foam sheet is a value measured by the method described in Examples.
  • the foam sheet of the present invention preferably has a 25% compressive strength of 1000 kPa or less.
  • the compressive strength is more preferably 600 kPa or less, further preferably 500 kPa or less, and particularly preferably 470 kPa or less.
  • the lower limit is not particularly limited, but is usually about 10 kPa, preferably 20 kPa or more.
  • the 25% compressive strength is a value measured at a measurement temperature of 23 ° C. by a measurement method based on JIS K6767.
  • the breaking point strength of the foam sheet of the present invention at 23 ° C. is preferably 2.0 N / 10 mm or more.
  • the breaking point strength is more preferably 2.5 N / 10 mm or more, and further preferably 4.0 N / 10 mm or more.
  • the upper limit of the breaking point strength is not particularly limited, but is usually about 50 N / 10 mm, preferably 40 N / 10 mm or less.
  • the breaking point strength is a value measured by the method described in the examples.
  • the foam sheet of the present invention preferably has a storage elastic modulus at 23 ° C. of 2.0 ⁇ 10 3 Pa or more.
  • the storage elastic modulus is 2.0 ⁇ 10 3 Pa or more, the impact resistance, particularly the low-speed impact resistance can be improved.
  • the storage elastic modulus is preferably 1.0 ⁇ 10 4 Pa or more, and more preferably 1.0 ⁇ 10 5 Pa or more.
  • the upper limit is not particularly limited, but is usually about 1.0 ⁇ 10 12 Pa, and is preferably 1.0 ⁇ 10 10 Pa or less from the viewpoint of flexibility.
  • the foam sheets of the present invention it preferably has a storage elastic modulus at -20 ° C. is 1.0 ⁇ 10 5 Pa or more.
  • the storage elastic modulus at -20 ° C. is 1.0 ⁇ 10 5 Pa or more, in particular, high-speed impact resistance is improved.
  • the storage elastic modulus at ⁇ 20 ° C. is more preferably 1.0 ⁇ 10 6 Pa or more, and further preferably 1.0 ⁇ 10 7 Pa or more.
  • the storage modulus at -60 ° C. is 1.0 ⁇ 10 6 Pa or more
  • the storage elastic modulus at 0 °C is 1. It is preferably 0 ⁇ 10 4 Pa or more.
  • the storage elastic modulus is a value measured by the method described in Examples.
  • Apparent density of the foam sheet of the present invention is more preferably is preferably 0.05g / cm 3 ⁇ 0.70g / cm 3, a 0.10g / cm 3 ⁇ 0.70g / cm 3, It is more preferably 0.15 g / cm 3 to 0.70 g / cm 3 , and particularly preferably 0.20 g / cm 3 to 0.70 g / cm 3.
  • the apparent density is within the above range, it becomes easy to improve the flexibility and cushioning property of the foam sheet.
  • a certain level of mechanical strength is imparted to the foam sheet, and it becomes easy to improve impact resistance and the like.
  • the value is not less than the above lower limit value, the moisture proof property is improved, and the WVTR is easily set to be not more than the above upper limit value.
  • the apparent density is a value measured in accordance with JIS K7222 (2005).
  • the foam sheet of the present invention is preferably crosslinked, and the degree of crosslinking represented by the gel fraction is preferably 30 to 80% by mass.
  • the degree of cross-linking is more preferably 40 to 70% by mass, and further preferably 45 to 65% by mass.
  • the method for measuring the gel fraction is a value measured by the method described in Examples.
  • the foam sheet of the present invention preferably has a closed cell ratio of 80% or more.
  • the closed cell ratio is 80% or more, the waterproof property and the moisture proof property are enhanced, and the above-mentioned moisture permeability can be easily achieved (particularly, the foam sheet according to the first invention).
  • the closed cell ratio is 80% or more, impact resistance can be ensured (particularly, the foam sheet according to the second to fourth inventions).
  • the closed cell ratio of the foam sheet is more preferably 90% or more. The higher the closed cell ratio, the better, and it may be 100% or less.
  • the cushioning property and impact resistance are also improved, and it becomes easy to maintain the original elasticity of the foam sheet even after heating or cooling. There is also an advantage that the rate of change in compressive strength tends to be low.
  • the closed cell ratio was measured by the method described in Examples.
  • the foam sheet of the present invention preferably has an average cell diameter of 20 to 400 ⁇ m.
  • the average cell diameter is more preferably 50 to 200 ⁇ m, and further preferably 70 to 160 ⁇ m.
  • the average cell diameter in the present invention is the larger of the average value of the bubble diameter in the machine direction (MD) and the average value of the bubble diameter in the direction perpendicular to the MD (TD: Transverse Direction). Is.
  • MD machine direction
  • TD Transverse Direction
  • the thickness of the foam sheet of the present invention is preferably 0.03 to 2.0 mm.
  • the thickness when the thickness is in this range, it is advantageous to suppress deformation and elongation under low stress.
  • the thickness is 0.03 mm or more, it becomes easy to secure the cushioning property of the foam sheet, and in particular, in the fourth invention, the impact resistance is further improved.
  • the thickness when the thickness is 2.0 mm or less, the thickness can be reduced, and it can be suitably used for thin electronic devices such as smartphones and tablets. Further, it becomes easy to secure the flexibility of the foam sheet.
  • the thickness of the foam sheet is more preferably 0.1 to 1.0 mm, further preferably 0.15 to 0.7 mm. The thickness was measured with a dial gauge.
  • the foam sheet of the present invention preferably contains an elastomer (A) and a polyolefin resin (B).
  • A elastomer
  • B polyolefin resin
  • thermoplastic elastomers examples include thermoplastic elastomers and ethylene- ⁇ -olefin copolymer rubbers.
  • thermoplastic elastomer examples include olefin-based thermoplastic elastomers, styrene-based thermoplastic elastomers, vinyl chloride-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, polyester-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, and the like.
  • these components may be used alone or in combination of two or more.
  • thermoplastic elastomers olefin-based thermoplastic elastomers, styrene-based thermoplastic elastomers, and ethylene- ⁇ -olefin-based copolymer rubbers are preferable, styrene-based thermoplastic elastomers and ethylene- ⁇ -olefin-based copolymer rubbers are more preferable, and styrene-based Thermoplastic elastomers are more preferred.
  • Olefin-based thermoplastic elastomers generally have polyolefins such as polyethylene and polypropylene as hard segments, and butyl rubber, halobutyl rubber, EPDM (ethylene-propylene-diene rubber), EPM (ethylene-propylene rubber), NBR ( Acrylonitrile-butadiene rubber), natural rubber and other rubber components are used as soft segments.
  • polyolefins such as polyethylene and polypropylene as hard segments, and butyl rubber, halobutyl rubber, EPDM (ethylene-propylene-diene rubber), EPM (ethylene-propylene rubber), NBR ( Acrylonitrile-butadiene rubber), natural rubber and other rubber components are used as soft segments.
  • EPDM ethylene-propylene-diene rubber
  • EPM ethylene-propylene rubber
  • NBR Acrylonitrile-butadiene rubber
  • natural rubber and other rubber components are used as soft segments.
  • TPO any of a blend type, a dynamic cross-link
  • the rubber component include the above-mentioned EPM and EPDM, and EPDM is particularly preferable.
  • EPDM include ethylene-propylene-5-ethylidene-2-norbornene copolymer rubber and ethylene-propylene-dicyclopentadiene copolymer rubber. Among these, ethylene-propylene-dicyclopentadiene copolymer rubber is used. preferable.
  • a block copolymer type can also be mentioned.
  • the block copolymer type include those having a crystalline block and a soft segment block, and more specifically, a crystalline olefin block-ethylene / butylene copolymer-crystalline olefin block copolymer (CEBC) is exemplified. Will be done.
  • CEBC the crystalline olefin block is preferably a crystalline ethylene block, and examples of such a commercially available product of CEBC include "DYNARON 6200P" manufactured by JSR Corporation.
  • styrene-based thermoplastic elastomer examples include a block copolymer having a polymer or copolymer block of styrene and a polymer or copolymer block of a conjugated diene compound.
  • conjugated diene compound examples include isoprene and butadiene.
  • the styrene-based thermoplastic elastomer used in the present invention may or may not be hydrogenated, but hydrogenation is preferable. When hydrogenating, hydrogenation can be performed by a known method.
  • the styrene-based thermoplastic elastomer is usually a block copolymer, and is a styrene-isoprene block copolymer (SI), a styrene-isoprene-styrene block copolymer (SIS), or a styrene-butadiene block copolymer (SB).
  • SI styrene-isoprene block copolymer
  • SIS styrene-isoprene-styrene block copolymer
  • SB styrene-butadiene block copolymer
  • SBS Steryl-butadiene-styrene block copolymer
  • SEBS styrene-ethylene / butylene-styrene block copolymer
  • SEPS styrene-ethylene / propylene-styrene block copolymer
  • SEEPS styrene-ethylene / ethylene / Propropylene-styrene block copolymer
  • SEB styrene-ethylene / butylene block copolymer
  • SEP styrene-ethylene / butylene-crystalline olefin block copolymer
  • SEBC Steryl-butadiene-styrene block copolymer
  • SEBS styrene-ethylene / butylene-styrene block copolymer
  • SEPS styrene-ethylene / propylene-styrene block copolymer
  • SEEPS styrene-ethylene / ethylene
  • block copolymers are preferable, among them, SIS, SEBS, SEPS, SEEPS and SEBC are more preferable, and SEEPS and SEBS are even more preferable.
  • the styrene-based thermoplastic elastomer according to the present invention preferably has a maximum peak temperature of tan ⁇ of ⁇ 60 to 25 ° C. as measured by dynamic viscoelasticity.
  • tan ⁇ the maximum peak temperature of tan ⁇ is relatively low as described above, the heat loss in the high-speed deformation region such as impact fracture becomes large, and the fracture strength of the foamed sheet tends to be improved.
  • the maximum peak temperature of tan ⁇ is outside the above range, it may be difficult to improve the breaking strength and flexibility of the foamed sheet.
  • the maximum peak temperature of tan ⁇ of the styrene-based thermoplastic elastomer is more preferably ⁇ 35 to 10 ° C., and even more preferably ⁇ 35 to 0 ° C.
  • the “maximum peak temperature of tan ⁇ ” refers to a value measured by a dynamic viscoelasticity measuring device in a tensile mode, a temperature rising rate of 10 ° C./min, and a frequency of 10 Hz.
  • Examples of the dynamic viscoelasticity measuring device that can be used for the measurement include "Leovibron DDV-III" manufactured by Orientec Co., Ltd.
  • the styrene-based thermoplastic elastomer has a structural unit derived from styrene, which makes it possible to improve the impact resistance of the foamed sheet.
  • the styrene content in the styrene-based thermoplastic elastomer is preferably 5 to 50% by mass. By setting the styrene content within this range, excellent impact resistance can be obtained. Further, when the value is not more than the above upper limit value, the compatibility with the polyolefin resin (B) described in detail later becomes good, and the crosslinkability and foamability tend to be good. From these viewpoints, the styrene content in the styrene-based thermoplastic elastomer is more preferably 7 to 40% by mass, further preferably 7 to 30% by mass.
  • the number average molecular weight of the styrene-based thermoplastic elastomer is not particularly limited, but is preferably 30,000 to 800,000, more preferably 120,000 to 180,000 from the viewpoint of fracture strength and processability.
  • the number average molecular weight is a potistyrene-equivalent value measured by gel permeation chromatography (GPC).
  • Examples of the ⁇ -olefin used in the ethylene- ⁇ -olefin copolymer rubber include propylene, 1-butene, 2-methylpropylene, 3-methyl-1-butene, 1-pentene, 1-hexene and 4-methyl-. Examples thereof include one or more ⁇ -olefins having 3 to 15 carbon atoms, preferably 3 to 10 carbon atoms such as 1-pentene and 1-octene. Among these, propylene and 1-butene are preferable, and 1-butene is more preferable.
  • the ethylene- ⁇ -olefin-based copolymer rubber used here is an amorphous or low-crystalline rubber-like substance in which two or more types of olefin-based monomers are substantially randomly copolymerized.
  • the ethylene- ⁇ -olefin copolymer rubber may have other monomer units in addition to the ethylene unit and the ⁇ -olefin unit.
  • the monomer forming the other monomer unit include 1,3-butadiene, 2-methyl-1,3-butadiene (isoprene), 1,3-pentadiene, and 2,3-dimethyl-1,3-butadiene.
  • Conjugate diene with 4 to 8 carbon atoms dicyclopentadiene, 5-ethylidene-2-norbornene, 1,4-hexadiene, 1,5-dicyclooctadiene, 7-methyl-1,6-octadiene, 5-vinyl- Non-conjugated diene having 5 to 15 carbon atoms such as 2-norbornene: Vinyl ester compound such as vinyl acetate: Unsaturated carboxylic acid ester such as methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate: Examples thereof include unsaturated carboxylic acids such as acrylic acid and methacrylic acid.
  • These monomers can be used alone or in combination of two or more.
  • non-conjugated diene having 5 to 15 carbon atoms is preferable, and 5-ethylidene-2-norbornene, 1,4-hexadiene, and dicyclopentadiene (DCPD) are more preferable from the viewpoint of availability.
  • DCPD dicyclopentadiene
  • the content of the ethylene unit of the ethylene- ⁇ -olefin copolymer rubber is usually 30 to 85% by mass, preferably 40 to 80% by mass, more preferably 45 to 75% by mass, and has 3 to 3 to 75 carbon atoms of propylene or the like.
  • the content of the ⁇ -olefin unit of 15, preferably 3 to 10 is usually 10 to 60% by mass, preferably 15 to 50% by mass, and the content of other monomer units such as unconjugated diene is usually It is 0 to 20% by mass, preferably 1 to 10% by mass.
  • ethylene- ⁇ -olefin copolymer rubber a ternary copolymer such as EPDM (ethylene-propylene-diene rubber) or EBDM (ethylene-butene-1-diene rubber) is preferable.
  • EPDM ethylene-propylene-diene rubber
  • EBDM ethylene-butene-1-diene rubber
  • examples of the ethylene- ⁇ -olefin copolymer include "EBT K-9330" manufactured by Mitsui Chemicals, Inc.
  • the polyolefin resin is a thermoplastic resin, and specific examples thereof include polyethylene resin, polypropylene resin, polybutene resin, ethylene-vinyl acetate copolymer, and the like, and polyethylene resin is preferable among them. Further, as the polyethylene resin, low density polyethylene (LDPE) is preferable, and linear low density polyethylene (LLDPE) is more preferable. Further, examples of the polyethylene resin include polyethylene resins polymerized with a polymerization catalyst such as a Ziegler-Natta catalyst, a metallocene catalyst, and a chromium oxide compound, and a polyethylene resin polymerized with a metallocene catalyst is preferably used.
  • a polymerization catalyst such as a Ziegler-Natta catalyst, a metallocene catalyst, and a chromium oxide compound
  • metallocene catalyst examples include compounds such as a bis (cyclopentadienyl) metal complex having a structure in which a transition metal is sandwiched between ⁇ -electron unsaturated compounds. More specifically, one or more cyclopentadienyl rings or their analogs are present as ligands in tetravalent transition metals such as titanium, zirconium, nickel, palladium, hafnium, and platinum. Can be mentioned. In such a metallocene catalyst, the properties of active sites are uniform, and each active site has the same activity. A polymer synthesized using a metallocene catalyst has high uniformity in molecular weight, molecular weight distribution, composition, composition distribution, etc.
  • the cross-linking is uniform. Proceed to. Since the uniformly crosslinked sheet is uniformly foamed, it becomes easy to stabilize the physical properties. Moreover, since it can be stretched uniformly, the thickness of the foam can be made uniform.
  • Examples of the ligand include a cyclopentadienyl ring, an indenyl ring and the like. These cyclic compounds may be substituted with hydrocarbon groups, substituted hydrocarbon groups or hydrocarbon-substituted metalloid groups.
  • Examples of the hydrocarbon group include methyl group, ethyl group, various propyl group, various butyl group, various amyl group, various hexyl group, 2-ethylhexyl group, various heptyl group, various octyl group, various nonyl group and various decyl group. , Various cetyl groups, phenyl groups and the like.
  • variable means various isomers including n-, sec-, tert-, and iso-.
  • a product obtained by polymerizing a cyclic compound as an oligomer may be used as a ligand.
  • monovalent anion ligands such as chlorine and bromine, divalent anion chelate ligands, hydrocarbons, alkoxides, arylamides, aryloxides, amides, phosphides, arylphosphides, etc. May be used.
  • metallocene catalysts containing tetravalent transition metals and ligands include cyclopentadienyl titanium tris (dimethylamide), methylcyclopentadienyl titanium tris (dimethyl amide), bis (cyclopentadienyl) titanium dichloride, and dimethyl. Examples thereof include silyltetramethylcyclopentadienyl-t-butylamide zirconium dichloride.
  • the metallocene catalyst exerts an action as a catalyst in the polymerization of various olefins by combining with a specific co-catalyst (co-catalyst).
  • co-catalyst examples include methylaluminoxane (MAO) and boron-based compounds.
  • the ratio of the cocatalyst used to the metallocene catalyst is preferably 100 to 1 million mol times, more preferably 50 to 5,000 mol times.
  • linear low-density polyethylene is preferable.
  • the linear low-density polyethylene is obtained by copolymerizing ethylene (for example, 75% by mass or more, preferably 90% by mass or more) with respect to the total amount of monomers and, if necessary, a small amount of ⁇ -olefin. Chain low density polyethylene is more preferred.
  • Specific examples of the ⁇ -olefin include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene and the like. Of these, ⁇ -olefins having 4 to 10 carbon atoms are preferable.
  • Polyethylene resin for example the density of the above-mentioned linear low density polyethylene, from the viewpoint of flexibility, preferably 0.870 ⁇ 0.925g / cm 3, more preferably 0.890 ⁇ 0.925g / cm 3, 0 .910 to 0.925 g / cm 3 is more preferable.
  • the polyethylene resin a plurality of polyethylene resins may be used, or a polyethylene resin other than the above-mentioned density range may be added.
  • Examples of the ethylene-vinyl acetate copolymer used as the polyolefin resin include an ethylene-vinyl acetate copolymer containing 50% by mass or more of ethylene.
  • Examples of the polypropylene resin include homopolypropylene and a propylene- ⁇ -olefin copolymer containing 50% by mass or more of propylene. One of these may be used alone, or two or more thereof may be used in combination.
  • Specific examples of the ⁇ -olefin constituting the propylene- ⁇ -olefin copolymer include ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-hexene, and 1-.
  • Examples thereof include octene, and among these, ⁇ -olefins having 6 to 12 carbon atoms are preferable.
  • Examples of the polybutene resin include a homopolymer of butene-1 and a copolymer with ethylene or propylene.
  • the mass ratio of the elastomer (A) to the polyolefin resin (B) is preferably 90:10 to 40:60. Within this range, it is possible to easily manufacture a foam sheet that exhibits the effects of the present invention. From the viewpoint of obtaining a more effective foam sheet, the mass ratio of the component (A) to the component (B) is more preferably in the range of 80:20 to 40:60, and 80:20 to 50. : 50 is more preferable, and a mass ratio of 80:20 to 60:40 is particularly preferable.
  • the foam sheet of the present invention is preferably obtained by foaming an effervescent composition containing the above resin and a foaming agent.
  • a foaming agent a thermally decomposable foaming agent is preferable.
  • an organic foaming agent and an inorganic foaming agent can be used.
  • the organic foaming agent include azo compounds such as azodicarboxylic amide, azodicarboxylic acid metal salt (azodicarboxylic acid barium, etc.) and azobisisobutyronitrile: N, N'-dinitrosopentamethylenetetramine and other nitroso compounds: hydra.
  • Hydrazine derivatives such as zodicarboxylic amide, 4,4'-oxybis (benzenesulfonyl hydrazide), and toluenesulfonyl hydrazide
  • semicarbazide compounds such as toluenesulfonyl semicarbazide can be mentioned.
  • the inorganic foaming agent include ammonium carbonate, sodium carbonate, ammonium hydrogencarbonate, sodium hydrogencarbonate, ammonium nitrite, sodium boron hydride, monosoda anhydrous citrate and the like.
  • an azo compound is preferable, and an azodicarbonamide is more preferable, from the viewpoint of obtaining fine bubbles, and from the viewpoint of economy and safety.
  • One type of pyrolysis foaming agent may be used alone, or two or more types may be used in combination.
  • the blending amount of the foaming agent in the effervescent composition is preferably 1 part by mass or more and 20 parts by mass or less, more preferably 1.5 parts by mass or more and 15 parts by mass or less, and 3 parts by mass or more and 10 parts by mass with respect to 100 parts by mass of the resin. More preferably, it is by mass or less.
  • the foamable sheet is appropriately foamed, and it is possible to impart appropriate flexibility and shock absorption to the foam sheet.
  • the blending amount of the foaming agent to 20 parts by mass or less, it is possible to prevent the foam sheet from foaming more than necessary, and to improve the mechanical strength of the foam sheet.
  • the effervescent composition may contain a decomposition temperature adjusting agent.
  • the decomposition temperature adjusting agent is compounded as having an adjusting function such as lowering the decomposition temperature of the thermally decomposing foaming agent and accelerating the decomposition rate. Specific compounds include zinc oxide, zinc stearate, and urea. And so on.
  • the decomposition temperature adjusting agent is blended in an amount of 0.01 to 5 parts by mass with respect to 100 parts by mass of the resin, for example, in order to adjust the surface condition of the foam sheet.
  • the effervescent composition may contain an antioxidant.
  • the antioxidant include phenolic antioxidants such as 2,6-di-t-butyl-p-cresol, sulfur-based antioxidants, phosphorus-based antioxidants, amine-based antioxidants and the like.
  • the antioxidant is blended in an amount of 0.01 to 5 parts by mass with respect to 100 parts by mass of the resin.
  • the effervescent composition may contain additives generally used for foams such as heat stabilizers, colorants, flame retardants, antistatic agents, and fillers.
  • the elastomer (A) and the polyolefin resin (B) are the main components, and the total content of the components (A) and (B) is, for example, 70% by mass or more based on the total amount of the foam sheet. It is preferably 80% by mass or more, more preferably 90% by mass or more.
  • the foam sheet of the present invention is not particularly limited, but can be produced by heating an effervescent sheet made of an effervescent composition containing at least a resin and a pyrolytic foaming agent to foam the pyrolytic foaming agent. Further, preferably, the foamable sheet is crosslinked, and the crosslinked foamable sheet is heated to foam. More specifically, the method for producing the foam sheet preferably includes the following steps (1) to (3). Step (1): A step of forming an effervescent sheet composed of an effervescent composition containing at least a resin and a pyrolytic foaming agent Step (2): Irradiating the effervescent sheet with ionizing radiation to crosslink the effervescent sheet. Step Step (3): A step of heating a crosslinked foamable sheet to foam a pyrolyzable foaming agent to obtain a foam sheet.
  • the method for forming the foamable sheet is not particularly limited, but for example, the resin and the additive are supplied to the extruder, melt-kneaded, and the foamable composition is extruded into a sheet from the extruder. It may be molded by this. Further, the effervescent sheet may be formed by pressing an effervescent composition or the like.
  • the molding temperature of the foamable sheet (that is, the temperature at the time of extrusion or the temperature at the time of pressing) is preferably 50 ° C. or higher and 250 ° C. or lower, and more preferably 80 ° C. or higher and 180 ° C. or lower.
  • a method of cross-linking the effervescent composition in the step (2) a method of irradiating the effervescent sheet with ionizing radiation such as electron beam, ⁇ ray, ⁇ ray, and ⁇ ray is used.
  • the irradiation amount of the ionizing radiation may be adjusted so that the degree of cross-linking of the obtained foam sheet is within the above-mentioned desired range, but is preferably 1 to 12 Mrad, and preferably 1.5 to 10 Mrad. More preferred.
  • the heating temperature at which the foamable composition is heated to foam the pyrolysis foaming agent may be equal to or higher than the foaming temperature of the pyrolysis foaming agent, but is preferably 200 to 300 ° C. More preferably, it is 220 to 280 ° C.
  • the effervescent composition is foamed to form bubbles to form a foam.
  • the foam sheet may be thinned by a method such as rolling or stretching.
  • a foam sheet may be obtained by a method other than the above.
  • an organic peroxide may be blended in advance in the effervescent composition, and the effervescent sheet may be heated to decompose the organic peroxide, or the like for cross-linking. .. If cross-linking is not necessary, step (2) may be omitted. In that case, in step (3), the uncrosslinked foamable sheet may be heated to foam.
  • the foam sheet of the present invention may be used for an adhesive tape using the foam sheet as a base material.
  • the adhesive tape includes, for example, a foam sheet and an adhesive material provided on at least one surface of the foam sheet.
  • the adhesive tape can be adhered to another member such as a support member via the adhesive material.
  • the adhesive tape may be a foam sheet provided with an adhesive material on both sides, or may be provided with an adhesive material on one side.
  • the pressure-sensitive adhesive material may be a single pressure-sensitive adhesive layer laminated on the surface of the foam sheet, as long as it has at least a pressure-sensitive adhesive layer, or a double-sided pressure-sensitive adhesive sheet attached to the surface of the foam sheet.
  • the pressure-sensitive adhesive layer is a single substance.
  • the double-sided pressure-sensitive adhesive sheet includes a base material and pressure-sensitive adhesive layers provided on both sides of the base material.
  • the double-sided pressure-sensitive adhesive sheet is used to bond one pressure-sensitive adhesive layer to the foam sheet and the other pressure-sensitive adhesive layer to another member.
  • the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited, and for example, an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, or the like can be used. Further, a release sheet such as a paper pattern may be further attached on the adhesive material.
  • the thickness of the pressure-sensitive adhesive layer is preferably 5 to 200 ⁇ m, more preferably 7 to 150 ⁇ m, and even more preferably 10 to 100 ⁇ m.
  • the use of the foam sheet is not particularly limited, but it is preferably used for electronic devices.
  • electronic devices include mobile phones such as smartphones, game devices, electronic organizers, tablet terminals, and portable electronic devices such as notebook personal computers.
  • the foam sheet can be used as a cushioning material inside an electronic device, and is preferably used as a cushioning material for a display device. Further, it may be used as a sealing material for filling gaps between parts inside an electronic device.
  • the foam sheet of the first invention of the present invention has both high impact resistance and low moisture permeability, it is particularly preferably used as a narrow-width adhesive tape.
  • the foam sheet of the third invention of the present invention has high impact resistance, it is particularly preferably used as a narrow-width adhesive tape.
  • the foam sheet of the fourth invention of the present invention has high impact resistance, low tackiness and is easy to handle, and therefore is particularly preferably used as a narrow-width adhesive tape.
  • the foam sheet may be used in any shape, but it is preferably narrow, and it is preferable that the foam sheet has an elongated rectangular shape, a frame shape such as a square frame, an L shape, a U shape, or the like. These widths are, for example, 5 mm or less, preferably 3 mm or less, more preferably 1 mm or less, and for example, 0.1 mm or more.
  • the foam sheet of the first invention of the present invention has both high impact resistance and low moisture permeability, it has good impact resistance even if it is narrow, and moisture is mixed inside the electronic device. It becomes difficult to make it.
  • the foam sheet of the second invention of the present invention is a foam sheet having both high-speed impact resistance and low-speed impact resistance, it has good impact resistance even if it is narrow.
  • the foam sheet used as a cushioning material for a display device may be arranged on the back side of a display panel provided in various electronic devices, for example, and may be used so as to cushion an impact applied to the display panel.
  • the foam sheet may be arranged on a support member arranged on the back side of the display panel.
  • the support member constitutes, for example, a part of a housing or the like of various electronic devices.
  • the foam sheet used in the electronic device may be provided with an adhesive material as described above, and may be attached to a display panel, a support member, or the like by the adhesive material.
  • the foam sheet of the second invention of the present invention is excellent in low-speed impact resistance in addition to high-speed impact resistance, it is suitably used for bonding, fixing, etc. to a heavy device such as a wall-mounted television. obtain.
  • the method for measuring each physical property and the method for evaluating the foam sheet are as follows.
  • Example according to the first invention [Physical characteristics after molding] (1) Glass transition temperature (Tg), loss tangent (tan ⁇ ) and storage elastic modulus Using a tensile storage elastic modulus measuring device manufactured by IT Measurement Control Co., Ltd. under the trade name "DVA-200 / L2", the following measurement conditions Tg, tan ⁇ and storage elastic modulus were determined by (Measurement condition) Length between marked lines: 2.5 cm Sample width: 0.5 cm Sample thickness: Thickness of foam sheet Deformation mode: Tension static / dynamic stress ratio: 1.5 Setting distortion: 1.0% Set temperature rise rate: 10 ° C / min Measurement frequency 10Hz Temperature range: -100 ° C to 100 ° C
  • a foam sheet is cut in the thickness direction along each of MD and TD, and a 200-fold enlarged photograph is taken using a digital microscope (manufactured by KEYENCE CORPORATION, product name "VHX-900"). I took a picture. In the magnified photograph taken, the bubble diameter of MD and the bubble diameter of TD were measured for all the bubbles existing on the cut surface having a length of 2 mm in each of MD and TD, and the operation was repeated 5 times. Then, the average value of the cell diameters of MD and TD of all the bubbles was taken as the average cell diameter of MD and TD.
  • MD means Machine direction, and is the direction which coincides with the extrusion direction and the like.
  • TD means Transverse direction, which is orthogonal to MD and parallel to the foam sheet.
  • ZD is the thickness direction of the foamed sheet, and is the direction perpendicular to both MD and TD.
  • Example 1-1 80 parts by mass of the elastomer (a), 20 parts by mass of the polyolefin resin, 9 parts by mass of the thermal decomposition foaming agent, 1 part by mass of the decomposition temperature adjusting agent, and 0.5 parts by mass of the phenolic antioxidant were prepared as raw materials. .. These materials were melt-kneaded and then pressed to obtain a foamable resin sheet having a thickness of 0.1 mm. Both sides of the obtained foamable resin sheet were irradiated with an electron beam for 6Mrad at an acceleration voltage of 500 keV to crosslink the foamable resin sheet. Next, the crosslinked foamable resin sheet was foamed by heating to 250 ° C. to obtain a foam sheet having a density of 0.56 g / cm 3 and a thickness of 0.10 mm. The results of evaluation by the above method are shown in Table 1-1.
  • Example 1-2 In the same manner as in Example 1-1, except that the thickness of the foamable resin sheet was changed to 0.15 mm in Example 1-1, the apparent density after foaming was 0.56 g / cm 3 , and the thickness was 0.15 mm. Foam sheet was obtained. The evaluation results are shown in Table 1-1.
  • Example 1-3 In Example 1-1, except that the pyrolysis foaming agent was changed to 8.0 parts by mass, the thickness of the foamable resin sheet was changed to 0.35 mm, and the irradiation dose was set to 5.5 Mrad. In the same manner as in 1-1, a foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm after foaming was obtained. The evaluation results are shown in Table 1-1.
  • Example 1-4 In the same manner as in Example 1-1, the apparent density after foaming was the same as in Example 1-1, except that the blending amount of the elastomer (a) was 50 parts by mass and the blending amount of the polyolefin resin was 50 parts by mass. A foam sheet having a thickness of 0.56 g / cm 3 and a thickness of 0.1 mm was obtained. The evaluation results are shown in Table 1-1.
  • Example 1-5 A foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.15 mm after foaming was obtained in the same manner as in Example 1-4 except that the irradiation dose was set to 8Mrad in Examples 1-4. .. The evaluation results are shown in Table 1-1.
  • Example 1-6 Foaming was carried out in the same manner as in Example 1-4, except that the pyrolyzable foaming agent was changed to 6.0 parts by mass and the thickness of the foamable resin sheet was changed to 0.35 mm in Example 1-4. A foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm was obtained. The evaluation results are shown in Table 1-1.
  • Example 1-7 In Example 1-4, an elastomer (b) was used instead of the elastomer (a), and a foam sheet was obtained in the same manner as in Example 1-4 except that the irradiation dose was 7Mrad. The evaluation results are shown in Table 1-1.
  • Example 1-8 A foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.15 mm after foaming was obtained in the same manner as in Example 1-7 except that the irradiation dose was set to 8Mrad in Example 1-7. .. The evaluation results are shown in Table 1-1.
  • Example 1-9 In Example 1-7, except that the pyrolysis foaming agent was changed to 6.0 parts by mass, the thickness of the foamable resin sheet was changed to 0.35 mm, and the irradiation dose was set to 5 Mrad. In the same manner as in No. 7, a foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm after foaming was obtained. The evaluation results are shown in Table 1-1.
  • Example 1-10 In Example 1-7, the same as in Example 1-7 except that the amount of the elastomer (b) compounded was 40 parts by mass, the amount of the polyolefin resin compounded was 60 parts by mass, and the irradiation dose was 5Mrad. A foam sheet was obtained. The evaluation results are shown in Table 1-1.
  • Example 1-11 In the same manner as in Example 1-10, a foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.15 mm after foaming was prepared in the same manner as in Example 1-10, except that the irradiation dose was set to 5.5 Mrad in Example 1-10. Obtained. The evaluation results are shown in Table 1-1.
  • Example 1-12 Foaming was carried out in the same manner as in Example 1-10, except that the pyrolyzable foaming agent was changed to 6.0 parts by mass and the thickness of the foamable resin sheet was changed to 0.35 mm in Example 1-10. A foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm was obtained. The evaluation results are shown in Table 1-1.
  • Example 1-2 a foam sheet was obtained in the same manner as in Example 1-2, except that 100 parts by mass of polyolefin resin was used without using an elastomer and the irradiation dose was 4.5 Mrad. Tg was not observed under the measurement conditions of the present application.
  • Comparative Example 1-2 Foam sheet in the same manner as in Example 1-2, except that the blending amount of the elastomer (a) was 10 parts by mass and the blending amount of the polyolefin resin (b) was 90 parts by mass in Example 1-2. Got The evaluation results are shown in Table 1-1.
  • the foam sheet of each example is a foam sheet having both high impact resistance and low moisture permeability, as compared with the foam sheet of the comparative example having high moisture permeability. Recognize.
  • Example according to the second invention [Physical characteristics after molding] (1) Glass transition temperature (Tg), loss tangent (tan ⁇ ) and storage elastic modulus The measurement was carried out under the same method and measurement conditions as the method in the first invention.
  • test piece was calculated by the same method as in the first invention except that the test piece was submerged in distilled water at 23 ° C. to a depth of 500 mm from the water surface. ..
  • FIG. 2 shows a schematic diagram of a test device for evaluating the interlayer strength.
  • a primer (“PPX primer” manufactured by Cemedine Co., Ltd.)
  • an adhesive 12 (“PPX” manufactured by Cemedine Co., Ltd.) having a diameter of 5 mm was dropped into the center of the coated portion.
  • a 25 mm square aluminum jig 13 was placed on the adhesive dropping portion, and the foam sheet and the jig 13 were pressure-bonded. Then, the foam sheet was cut according to the size of the jig 13.
  • a primer was applied to the surface of the cut foam sheet to which the jig 13 was not adhered, and an adhesive 12 having a diameter of 5 mm was dropped on the center of the coated portion.
  • an adhesive 12 having a diameter of 5 mm was dropped on the center of the coated portion.
  • a 10 mm square aluminum jig 14 was placed on the adhesive dropping portion, and the foam sheet and the jig 14 were pressure-bonded.
  • a cut 15 was made in the foam sheet along the size of the jig 14.
  • the adhesive was cured by leaving this at room temperature for 30 minutes to prepare a sample for measuring the interlayer strength.
  • a 1 kN load cell was installed in a testing machine (“Tensilon universal material tester” manufactured by A & D Co., Ltd.) provided with a constant temperature bath so that tests could be performed in the constant temperature bath. Then, a sample for measuring the interlayer strength was attached to the testing machine so that the sheet surface of the foam sheet was perpendicular to the tensile direction. After setting the temperature of the constant temperature bath to 23 ° C., the sample was left to stand until the temperature of the sample for interlayer strength measurement reached 23 ° C. Then, one of the jigs was pulled vertically upward at a speed of 100 mm / min, and only the 1 cm square area of the foam sheet was peeled off. The maximum load at this time was measured and used as the first measurement result. The same operation was repeated three times, and the average value was taken as the interlayer strength at 23 ° C.
  • Example 2-1 80 parts by mass of elastomer (a), 20 parts by mass of polyolefin resin, 9.0 parts by mass of pyrolysis foaming agent, 1 part by mass of decomposition temperature adjuster, and 0.5 parts by mass of phenolic antioxidant are used as raw materials. Prepared as. These materials were melt-kneaded and then pressed to obtain a foamable resin sheet having a thickness of 0.1 mm. Both sides of the obtained foamable resin sheet were irradiated with an electron beam for 6Mrad at an acceleration voltage of 500 keV to crosslink the foamable resin sheet. Next, the crosslinked foamable resin sheet was foamed by heating to 250 ° C. to obtain a foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.10 mm. The results of evaluation by the above method are shown in Table 2-1.
  • Example 2-2 In the same manner as in Example 2-1 except that the thickness of the foamable resin sheet was changed to 0.15 mm in Example 2-1 the apparent density after foaming was 0.56 g / cm 3 , and the thickness was 0.15 mm. Foam sheet was obtained. The evaluation results are shown in Table 2-1.
  • Example 2-3 Except that the pyrolyzable foaming agent was changed to 8.0 parts by mass, the thickness of the foamable resin sheet was changed to 0.35 mm, and the electron dose was changed to 5.5 Mrad in Example 2-1.
  • Example 2-1 In the same manner as in Example 2-1 to obtain a foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm after foaming. The evaluation results are shown in Table 2-1.
  • Example 2-4 The apparent density after foaming is the same as in Example 2-1 except that the blending amount of the elastomer (a) is 50 parts by mass and the blending amount of the polyolefin resin is 50 parts by mass in Example 2-1.
  • Example 2-5 In Example 2-1 using the elastomer (b) instead of the elastomer (a), the blending amount of the elastomer (b) is 40 parts by mass, the blending amount of the polyolefin resin is 60 parts by mass, and the electron dose is 5.
  • a foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.1 mm after foaming was obtained in the same manner as in Example 2-1 except that it was changed to 0.0 Mrad. The evaluation results are shown in Table 2-1.
  • Example 2-6 In Example 2-5, the amount of the elastomer (b) was 50 parts by mass, the amount of the polyolefin resin was 50 parts by mass, and the electron dose was changed to 7.0 Mrad. Similarly, a foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.1 mm after foaming was obtained. The evaluation results are shown in Table 2-1.
  • Example 2-7 In Example 2-4, except that the pyrolysis foaming agent was changed to 6.0 parts by mass, the thickness of the foamable resin sheet was changed to 0.35 mm, and the electron dose was changed to 5.0 Mrad. In the same manner as in Example 2-4, a foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm after foaming was obtained. The evaluation results are shown in Table 2-1.
  • Example 2-2 the apparent density after foaming was the same as in Example 2-2, except that the blending amount of the elastomer (a) was 10 parts by mass and the blending amount of the polyolefin resin was 90 parts by mass. A foam sheet having a thickness of 0.56 g / cm 3 and a thickness of 0.15 mm was obtained. The evaluation results are shown in Table 2-1.
  • Example 2-2 the apparent density after foaming was the same as in Example 2-2, except that the elastomer (a) was not blended, only the polyolefin resin was used, and the electron dose was changed to 4.5 Mrad. A foam sheet having a thickness of 0.56 g / cm 3 and a thickness of 0.15 mm was obtained. The evaluation results are shown in Table 2-1.
  • Example 2-7 Comparative Example 2-3 In Example 2-7, the apparent density after foaming was 0.14 g / cm 3 , in the same manner as in Example 2-7, except that only the elastomer (a) was used and the electron dose was changed to 4.5 Mrad. A foam sheet having a thickness of 0.5 mm was obtained. The evaluation results are shown in Table 2-1.
  • the foam sheet of each example has high impact resistance, has a good storage elastic modulus at low temperature, and is particularly excellent in high-speed impact resistance.
  • the interlayer strength is high and the low-speed impact resistance is also excellent. That is, the foam sheet of the present invention is a foam sheet excellent in both high-speed impact resistance and low-speed impact resistance.
  • the foam sheet described in Comparative Example has low impact resistance (Comparative Examples 2-1 and 2-2) or low interlayer strength (Comparative Example 2-3).
  • Example according to the third invention [Physical characteristics after molding] (1) Glass transition temperature (Tg), loss tangent (tan ⁇ ) and storage elastic modulus The measurement was carried out under the same method and measurement conditions as the method in the first invention.
  • MD means Machine direction, and is the direction which coincides with the extrusion direction and the like.
  • TD means Transverse direction, which is orthogonal to MD and parallel to the foam sheet.
  • ZD is the thickness direction of the foamed sheet, and is the direction perpendicular to both MD and TD.
  • Example 3-1 Using 80 parts by mass of the elastomer (a), 20 parts by mass of the polyolefin resin, 9.0 parts by mass of the thermal decomposition foaming agent, 1 part by mass of the decomposition temperature adjusting agent, and 0.5 parts by mass of the phenolic antioxidant as raw materials. I prepared it. These materials were melt-kneaded and then pressed to obtain a foamable resin sheet having a thickness of 0.1 mm. Both sides of the obtained foamable resin sheet were irradiated with an electron beam for 6Mrad at an acceleration voltage of 500 keV to crosslink the foamable sheet. Next, the crosslinked foamable sheet was heated to 250 ° C. to foam the foamable resin sheet to obtain a foam sheet having a density of 0.56 g / cm 3 and a thickness of 0.10 mm. The results of evaluation by the above method are shown in Table 3-1.
  • Example 3-2 In the same manner as in Example 3-1 except that the thickness of the foamable resin sheet was changed to 0.15 mm in Example 3-1 the apparent density after foaming was 0.56 g / cm 3 , and the thickness was 0.15 mm. Foam sheet was obtained. The evaluation results are shown in Table 3-1.
  • Example 3-3 Except that in Example 3-1 the pyrolysis type foaming agent was changed to 8.0 parts by mass, the electron dose was changed to 5.5 Mrad, and the thickness of the foamable resin sheet was changed to 0.35 mm. In the same manner as in Example 3-1 a foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm after foaming was obtained. The evaluation results are shown in Table 3-1.
  • Example 3-4 In Example 3-1 the apparent density after foaming was the same as in Example 3-1 except that the blending amount of the elastomer (a) was 50 parts by mass and the blending amount of the polyolefin resin was 50 parts by mass. A foam sheet having a thickness of 0.56 g / cm 3 and a thickness of 0.1 mm was obtained. The evaluation results are shown in Table 3-1.
  • Example 3-5 A foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.15 mm after foaming in the same manner as in Example 3-4, except that the electron dose was changed to 8.0 Mrad in Example 3-4. Got The evaluation results are shown in Table 3-1.
  • Example 3-6 In Example 3-4, except that the pyrolysis foaming agent was changed to 6.0 parts by mass, the electron dose was changed to 6.0 Mrad, and the thickness of the foamable resin sheet was changed to 0.35 mm. In the same manner as in Example 3-4, a foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm after foaming was obtained. The evaluation results are shown in Table 3-1.
  • Example 3-7 In Example 3-4, the apparent density after foaming was 0 in the same manner as in Example 3-4, except that the elastomer (b) was used instead of the elastomer (a) and the electron dose was changed to 7.0 Mrad. A foam sheet having a thickness of .56 g / cm 3 and a thickness of 0.1 mm was obtained. The evaluation results are shown in Table 3-1.
  • Example 3-8 A foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.15 mm after foaming in the same manner as in Example 3-7, except that the electron dose was changed to 8.0 Mrad in Example 3-7. Got The evaluation results are shown in Table 3-1.
  • Example 3-9 In Example 3-7, except that the pyrolysis foaming agent was changed to 6.0 parts by mass, the electron dose was changed to 5.0 Mrad, and the thickness of the foamable resin sheet was changed to 0.35 mm. In the same manner as in Example 3-7, a foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm after foaming was obtained. The evaluation results are shown in Table 3-1.
  • Example 3-10 In Example 3-7, the amount of the elastomer (b) was 40 parts by mass, the amount of the polyolefin resin was 60 parts by mass, and the electron dose was changed to 5.0 Mrad. Similarly, a foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.1 mm after foaming was obtained. The evaluation results are shown in Table 3-1.
  • Example 3-11 A foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.15 mm after foaming in the same manner as in Example 3-10, except that the electron dose was changed to 5.5 Mrad in Example 3-10. Got The evaluation results are shown in Table 3-1.
  • Example 3-12 In Example 3-10, except that the pyrolysis foaming agent was changed to 6.0 parts by mass, the electron dose was changed to 5.0 Mrad, and the thickness of the foamable resin sheet was changed to 0.35 mm. In the same manner as in Example 3-10, a foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm after foaming was obtained. The evaluation results are shown in Table 3-1.
  • Comparative Example 3-1 A foam sheet was obtained in the same manner as in Example 3-2, except that 100 parts by mass of the elastomer (a) was used without using the polyolefin resin in Example 3-2.
  • Comparative Example 3-2 A foam sheet was obtained in the same manner as in Example 3-2, except that 100 parts by mass of the elastomer (b) was used without using the polyolefin resin in Example 3-2.
  • Comparative Example 3-3 A foam sheet was obtained in the same manner as in Example 3-2, except that in Example 3-2, 100 parts by mass of polyolefin resin was used without using an elastomer and the electron dose was changed to 4.5 Mrad. Tg was not observed under the measurement conditions of the present application.
  • Comparative Example 3-4 Example 3 except that the blending amount of the elastomer (a) was 10 parts by mass, the blending amount of the polyolefin resin (b) was 90 parts by mass, and the electron dose was changed to 6.0 Mrad in Example 3-2. A foam sheet was obtained in the same manner as in -2. The evaluation results are shown in Table 3-1.
  • the foam sheets of Comparative Examples 3-1 and 3-2 were peeled or wrinkled in the sheet peeling test after lamination. Further, the foam sheets of Comparative Examples 3-3 and 3-4 had good results in the sheet peeling test after lamination, but could not obtain sufficient impact resistance. On the other hand, the foam sheet of each example had high impact resistance, and no peeling or wrinkling occurred in the sheet peeling test after laminating.
  • the foam sheet was cut into 10 cm squares and measured with a tack tester (manufactured by UBM, product name "Tack Tester TA-500") at a temperature of 23 ° C.
  • a tack tester manufactured by UBM, product name "Tack Tester TA-500”
  • To the surface of the foam sheet the jig of the cross-sectional area 0.03 cm 2 (metal), a load 100000gf / cm 2, after pressing one second, at the time of pulling the jig at a rate of 0.8 mm / sec
  • the load (gf / cm 2 ) was measured, and the obtained value was taken as the tackiness of the surface of the resin foam sheet.
  • Example 4-1 Using 80 parts by mass of the elastomer (a), 20 parts by mass of the polyolefin resin, 9.0 parts by mass of the thermal decomposition foaming agent, 1 part by mass of the decomposition temperature adjusting agent, and 0.5 parts by mass of the phenolic antioxidant as raw materials. I prepared it. These materials were melt-kneaded and then pressed to obtain a foamable resin sheet having a thickness of 0.1 mm. Both sides of the obtained foamable resin sheet were irradiated with an electron beam for 6Mrad at an acceleration voltage of 500 keV to crosslink the foamable sheet. Next, the crosslinked foamable sheet was heated to 250 ° C. to foam the foamable resin sheet to obtain a foam sheet having a density of 0.56 g / cm 3 and a thickness of 0.10 mm. The results of evaluation by the above method are shown in Table 4-1.
  • Example 4-2 The apparent density after foaming was 0.56 g / cm 3 and the thickness was 0.15 mm in the same manner as in Example 4-1 except that the thickness of the foamable resin sheet was changed to 0.15 mm in Example 4-1. Foam sheet was obtained. The evaluation results are shown in Table 4-1.
  • Example 4-3 Except that the pyrolyzable foaming agent was changed to 8.0 parts by mass, the thickness of the foamable resin sheet was changed to 0.35 mm, and the electron dose was changed to 5.5 Mrad in Example 4-1.
  • Example 4-4 The apparent density after foaming is the same as in Example 4-1 except that the blending amount of the elastomer (a) is 50 parts by mass and the blending amount of the polyolefin resin is 50 parts by mass in Example 4-1.
  • Example 4-5 In the same manner as in Example 4-4, a foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.15 mm after foaming was prepared in the same manner as in Example 4-4, except that the irradiation dose was set to 8.0 Mrad in Example 4-4. Obtained. The evaluation results are shown in Table 4-1.
  • Example 4-6 Foaming was carried out in the same manner as in Example 4-4, except that the pyrolyzable foaming agent was changed to 6.0 parts by mass and the thickness of the foamable resin sheet was changed to 0.35 mm in Example 4-4. A foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm was obtained. The evaluation results are shown in Table 4-1.
  • Example 4-7 In Example 4-4, the apparent density after foaming was 0 in the same manner as in Example 4-4, except that the irradiation dose was changed to 7.0 Mrad by using the elastomer (b) instead of the elastomer (a). A foam sheet having a thickness of .56 g / cm 3 and a thickness of 0.1 mm was obtained. The evaluation results are shown in Table 4-1.
  • Example 4-8 In the same manner as in Example 4-7, a foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.15 mm after foaming was prepared in the same manner as in Example 4-7, except that the irradiation dose was set to 8.0 Mrad in Example 4-7. Obtained. The evaluation results are shown in Table 4-1.
  • Example 4-9 In Examples 4-7, except that the pyrolysis foaming agent was changed to 6.0 parts by mass, the thickness of the foamable resin sheet was changed to 0.35 mm, and the irradiation dose was set to 5.0 Mrad. In the same manner as in 4-7, a foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm after foaming was obtained. The evaluation results are shown in Table 4-1.
  • Example 4-10 In Example 4-7, the same as in Example 4-7 except that the amount of the elastomer (b) compounded was 40 parts by mass, the amount of the polyolefin resin compounded was 60 parts by mass, and the irradiation dose was 5Mrad. A foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.1 mm after foaming was obtained. The evaluation results are shown in Table 4-1.
  • Example 4-11 A foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.15 mm after foaming in the same manner as in Example 4-10, except that the irradiation dose was changed to 5.5 Mrad in Example 4-10. Got The evaluation results are shown in Table 4-1.
  • Example 4-12 After foaming in the same manner as in Example 4-10, except that the pyrolyzable foaming agent was changed to 6.0 parts by mass and the thickness of the foamable resin sheet was changed to 0.35 mm in Example 4-10. A foam sheet having an apparent density of 0.14 g / cm 3 and a thickness of 0.5 mm was obtained. The evaluation results are shown in Table 4-1.
  • Example 4 a foam sheet was obtained in the same manner as in Example 4-2, except that 100 parts by mass of the elastomer (a) was used without using the polyolefin resin and the irradiation dose was 4.5 Mrad. rice field. Tg was not observed under the measurement conditions of the present application.
  • Comparative Example 4-2 A foam sheet was obtained in the same manner as in Example 4-2 except that 100 parts by mass of the elastomer (b) was used without using the polyolefin resin in Example 4-2.
  • Example 4 a foam sheet was obtained in the same manner as in Example 4-2, except that 100 parts by mass of the polyolefin resin was used without using an elastomer and the irradiation dose was 4.5 Mrad.
  • Example 4-4 In Example 4-2, the amount of the elastomer (a) was 10 parts by mass, the amount of the polyolefin resin was 90 parts by mass, and the electron dose was changed to 6.0 Mrad. Similarly, a foam sheet having an apparent density of 0.56 g / cm 3 and a thickness of 0.15 mm after foaming was obtained. The evaluation results are shown in Table 4-1.
  • the foam sheets of Comparative Examples 4-1 and 4-2 have high tackiness and inferior handleability. Further, the foam sheets of Comparative Examples 4-3 and 4-4 were inferior in impact resistance. On the other hand, it can be seen that the foam sheet of the present invention exhibits high impact resistance and good tackiness.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Adhesive Tapes (AREA)

Abstract

La présente invention concerne une feuille de mousse ayant une température de transition vitreuse (Tg) allant de -60 °C à 0 °C et une valeur de crête de facteur de dissipation électrique (tanδ) supérieure ou égale à 0,25.　Une feuille de mousse ayant une perméabilité à l'humidité exceptionnellement faible et une résistance aux chocs élevée, une feuille de mousse dotée à la fois d'une résistance aux chocs à grande vitesse et d'une résistance aux chocs à faible vitesse, une feuille de mousse ayant une performance de manipulation élevée tout en maintenant une résistance élevée aux chocs, et une feuille de mousse ayant une résistance élevée aux chocs et des propriétés de traction appropriées pour une manipulation peuvent être fournies.
PCT/JP2021/013707 2020-03-31 2021-03-30 Feuille de mousse WO2021201044A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2021535121A JP6974655B1 (ja) 2020-03-31 2021-03-30 発泡体シート
JP2021179057A JP2022023200A (ja) 2020-03-31 2021-11-01 発泡体シート

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP2020065345 2020-03-31
JP2020-065351 2020-03-31
JP2020065352 2020-03-31
JP2020-065347 2020-03-31
JP2020-065345 2020-03-31
JP2020-065352 2020-03-31
JP2020065347 2020-03-31
JP2020065351 2020-03-31

Publications (1)

Publication Number Publication Date
WO2021201044A1 true WO2021201044A1 (fr) 2021-10-07

Family

ID=77930371

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/013707 WO2021201044A1 (fr) 2020-03-31 2021-03-30 Feuille de mousse

Country Status (2)

Country Link
JP (2) JP6974655B1 (fr)
WO (1) WO2021201044A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023176984A1 (fr) * 2022-03-18 2023-09-21 積水化学工業株式会社 Feuille de mousse et ruban adhésif

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013191222A1 (fr) * 2012-06-20 2013-12-27 積水化学工業株式会社 Matériau amortisseur et matériau d'étanchéité
JP2015110721A (ja) * 2013-08-26 2015-06-18 日東電工株式会社 発泡シート
WO2015152222A1 (fr) * 2014-03-31 2015-10-08 積水化学工業株式会社 Feuille de mousse de polyoléfine et ruban adhésif sensible à la pression
WO2018181498A1 (fr) * 2017-03-31 2018-10-04 積水化学工業株式会社 Feuille expansée à base de polyoléfine, son procédé de production et ruban adhésif sensible à la pression
WO2019235529A1 (fr) * 2018-06-06 2019-12-12 積水化学工業株式会社 Feuille de mousse de résine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013191222A1 (fr) * 2012-06-20 2013-12-27 積水化学工業株式会社 Matériau amortisseur et matériau d'étanchéité
JP2015110721A (ja) * 2013-08-26 2015-06-18 日東電工株式会社 発泡シート
WO2015152222A1 (fr) * 2014-03-31 2015-10-08 積水化学工業株式会社 Feuille de mousse de polyoléfine et ruban adhésif sensible à la pression
WO2018181498A1 (fr) * 2017-03-31 2018-10-04 積水化学工業株式会社 Feuille expansée à base de polyoléfine, son procédé de production et ruban adhésif sensible à la pression
WO2019235529A1 (fr) * 2018-06-06 2019-12-12 積水化学工業株式会社 Feuille de mousse de résine

Also Published As

Publication number Publication date
JP2022023200A (ja) 2022-02-07
JP6974655B1 (ja) 2021-12-01
JPWO2021201044A1 (fr) 2021-10-07

Similar Documents

Publication Publication Date Title
JP6987178B2 (ja) ポリオレフィン系樹脂発泡シート及び粘着テープ
JP6672439B2 (ja) ポリオレフィン系樹脂発泡シート及び粘着テープ
EP3385315B1 (fr) Feuille de mousse de résine de polyoléfine et bande adhésive
JP2013053179A (ja) 架橋ポリオレフィン樹脂発泡シート、粘着テープ及びシール材
WO2015152222A1 (fr) Feuille de mousse de polyoléfine et ruban adhésif sensible à la pression
JP7295623B2 (ja) 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
JP6687515B2 (ja) 両面粘着テープ
JP6974655B1 (ja) 発泡体シート
JP6625032B2 (ja) 独立気泡樹脂発泡体及びその製造方法
JPWO2018181486A1 (ja) 樹脂発泡シート、樹脂発泡シートの製造方法、及び粘着テープ
JP6918701B2 (ja) ポリオレフィン系発泡シート、その製造方法及び粘着テープ
JP6955947B2 (ja) 積層体
JP2019178293A (ja) 粘着テープ
WO2023176984A1 (fr) Feuille de mousse et ruban adhésif
KR20160140570A (ko) 점착 테이프 및 점착 테이프의 제조 방법
US20230382082A1 (en) Multilayer foam sheet and adhesive tape
JP2023040962A (ja) 発泡体
JP2023040958A (ja) 発泡体シート
JP2023040961A (ja) 発泡体
JP2023040959A (ja) 発泡体シート
JP7316371B2 (ja) 多層発泡体シート
JP2022059537A (ja) 発泡体シート
WO2022071453A1 (fr) Feuille de mousse
JP2022059536A (ja) 発泡体シート
JP2022059538A (ja) 発泡体シート

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2021535121

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21781081

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21781081

Country of ref document: EP

Kind code of ref document: A1