WO2018025568A1 - Feuille de mousse, appareil électrique/électronique, et appareil de montage de panneau tactile - Google Patents

Feuille de mousse, appareil électrique/électronique, et appareil de montage de panneau tactile Download PDF

Info

Publication number
WO2018025568A1
WO2018025568A1 PCT/JP2017/024785 JP2017024785W WO2018025568A1 WO 2018025568 A1 WO2018025568 A1 WO 2018025568A1 JP 2017024785 W JP2017024785 W JP 2017024785W WO 2018025568 A1 WO2018025568 A1 WO 2018025568A1
Authority
WO
WIPO (PCT)
Prior art keywords
thickness
foam sheet
foam
weight
sheet according
Prior art date
Application number
PCT/JP2017/024785
Other languages
English (en)
Japanese (ja)
Inventor
加藤和通
徳山英幸
Original Assignee
日東電工株式会社
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
Priority claimed from JP2017130712A external-priority patent/JP6956544B2/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to US16/322,776 priority Critical patent/US20210178734A1/en
Priority to CN201780060323.1A priority patent/CN109790317B/zh
Priority to KR1020197005523A priority patent/KR102414406B1/ko
Publication of WO2018025568A1 publication Critical patent/WO2018025568A1/fr

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
    • C08J9/36—After-treatment
    • C08J9/365—Coating
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • 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
    • C08J9/30—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by mixing gases into liquid compositions or plastisols, e.g. frothing with air
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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
    • C08J2201/00—Foams characterised by the foaming process
    • C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
    • C08J2201/026—Crosslinking before of after foaming
    • 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
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/04—Foams characterised by their properties characterised by the foam pores
    • C08J2205/044—Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter
    • 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
    • C08J2207/00—Foams characterised by their intended use
    • 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
    • C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • 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
    • C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2333/18—Homopolymers or copolymers of nitriles
    • C08J2333/20—Homopolymers or copolymers of acrylonitrile

Definitions

  • the present invention relates to a foam sheet, an electric / electronic device, and a touch panel mounted device. More specifically, the present invention relates to a foam sheet, an electric / electronic device using the foam sheet, and a touch panel mounting device using the foam sheet.
  • an image display member fixed to an image display device such as a liquid crystal display, an electroluminescence display, a plasma display, a display member attached to a so-called “mobile phone”, “smart phone”, “portable information terminal”, camera,
  • a foam material is used when an optical member such as a lens is fixed to a predetermined part (for example, a housing).
  • Examples of such a foam material include a low-foam, fine-cell urethane foam having a closed cell structure and a product obtained by compression molding a highly foamed urethane, and a polyethylene foam having a closed cell and an expansion ratio of about 30 times. It was used.
  • a gasket made of a polyurethane foam having a density of 0.3 to 0.5 g / cm 3 see Patent Document 1
  • an electric / electronic product made of a foamed structure having an average cell diameter of 1 to 500 ⁇ m is used.
  • a sealing material for equipment see Patent Document 2 or the like is used.
  • Such a foam material is required to have a characteristic (impact absorbability) that absorbs an impact when it is applied.
  • a characteristic impact absorbability
  • a foam sheet with excellent shock absorption is used to absorb the impact of the collision and prevent the display member from being damaged.
  • the conventional foam sheet having excellent impact absorbability tends to have better impact absorbability as it is more flexible, but on the other hand, it tends to take time to return to the original thickness after the impact is released. For this reason, the conventional foamed sheet with excellent shock absorption cannot receive the second and subsequent shocks because it receives an impact before it completely returns to its original thickness when repeated impacts are applied. It was often inferior in resistance. For this reason, there is a need for a foam sheet that is excellent in impact absorption and excellent in resistance to repeated impacts.
  • an object of the present invention is to provide a foamed sheet that is excellent in impact absorption and excellent in resistance to repeated impacts. Another object of the present invention is that it has excellent shock absorption and resistance to repeated impacts, and when used in a touch panel-mounted device, it causes display unevenness in the display unit due to a user's touch operation.
  • the object is to provide a foam sheet that can be highly suppressed.
  • Another object of the present invention is to provide a foam sheet that is excellent in the above characteristics even when the thickness is very small.
  • Another object of the present invention is to provide a foamed sheet that can prevent misalignment without laminating an adhesive layer when laminating other members in addition to the above characteristics.
  • the present inventors have found that the average cell diameter is within a specific range, the repulsive force when compressing the thickness by 50% is 6.0 N / cm 2 or less, and According to the foam sheet having a thickness recovery rate of 90% or more after 0.5 seconds after releasing a compressed state with a specific load applied, it has excellent shock absorption and excellent resistance to repeated impacts. I found it.
  • the present invention has been completed based on these findings.
  • the average cell diameter is 10 to 200 ⁇ m
  • the repulsive force when the thickness is compressed by 50% is 6.0 N / cm 2 or less
  • the thickness recovery rate defined by the following formula is 90% or more.
  • a foam sheet is provided.
  • Thickness recovery rate (%) (thickness 0.5 seconds after releasing the compressed state) / (initial thickness) ⁇ 100
  • Initial thickness Thickness of foam sheet before applying load
  • Thickness 0.5 seconds after releasing compression Maintaining 120 seconds with 100 g / cm 2 applied to foam sheet, releasing compression The thickness of the foam sheet 0.5 seconds after release
  • the foamed sheet preferably has a thickness of 30 to 1000 ⁇ m and a density of 0.2 to 0.7 g / cm 3 .
  • the foamed sheet has a peak top in the range where the loss tangent (tan ⁇ ), which is the ratio of the storage elastic modulus and loss elastic modulus at an angular frequency of 1 rad / s in dynamic viscoelasticity measurement, is -60 ° C or higher and 20 ° C or lower. It is preferable to have.
  • the foamed sheet was allowed to collide with the impactor five times continuously at intervals of 1 second on the support plate of the structure composed of the support plate and the foamed sheet.
  • the rate of increase of the impact force at the time of the fifth collision with respect to the impact force at the time of the first collision is preferably 5% or less.
  • the foam sheet preferably contains a crosslinking agent and a silicone compound.
  • the foamed sheet preferably has a solvent insoluble content with respect to methyl ethyl ketone of 80% by weight or more.
  • the foamed sheet preferably has a maximum loss tangent (tan ⁇ ) in the range of ⁇ 60 ° C. to 20 ° C. of 0.2 or more.
  • the foam sheet preferably has a thickness recovery rate of 50% or more at a high temperature defined below. Thickness recovery rate at high temperature: The foamed sheet was compressed in the thickness direction so as to have a thickness of 50% of the initial thickness in an 80 ° C atmosphere, and after 22 hours, it was left in a 23 ° C atmosphere for 2 hours. Then, the compressed state is released, and the ratio of the thickness to the initial thickness after 24 hours from the release of the compressed state
  • the foam sheet is preferably a foam sheet using an acrylic polymer as a resin material.
  • the foamed sheet preferably has a shear adhesive force (23 ° C., tensile speed 50 mm / min) of at least one surface to a SUS304BA plate of 0.5 N / 100 mm 2 or more.
  • the foam sheet is preferably a mechanical foam of an emulsion resin composition.
  • the foam sheet may have an adhesive layer on one side or both sides.
  • the foamed sheet is preferably used as an impact absorbing sheet for electrical and electronic equipment.
  • the foam sheet is used for a device equipped with a touch panel.
  • the present invention also provides an electrical / electronic device having the foam sheet.
  • the electrical / electronic device includes a display member, and the foam sheet is sandwiched between a housing of the electrical / electronic device and the display member.
  • the present invention also provides a touch panel-equipped device having the foam sheet.
  • the touch panel-mounted device preferably includes the foam sheet, the display panel, and the touch panel, and the foam sheet is disposed in a space on the back side of the display panel.
  • the foamed sheet of the present invention is excellent in impact absorption and excellent in resistance to repeated impacts.
  • the foam sheet of the present invention is excellent in shock absorption and resistance to repeated impacts when used in a touch panel-mounted device, and is highly resistant to display unevenness in the display unit due to a user's touch operation. Can be suppressed.
  • the foamed sheet of the present invention is excellent in shock absorption and resistance to repeated impacts even when the thickness is very small. Accordingly, the occurrence of display unevenness in the display unit can be highly suppressed.
  • the foamed sheet of the present invention can be configured to prevent misalignment without laminating an adhesive layer when laminating other members.
  • FIG. 1 It is a schematic block diagram of a pendulum type impact tester (impact test device). It is a figure which shows schematic structure of the holding member of a pendulum type impact tester (impact test apparatus).
  • the foamed sheet of the present invention has an average cell diameter of 10 to 200 ⁇ m, a repulsive force when the thickness is compressed by 50%, is 6.0 N / cm 2 or less, and a thickness recovery rate defined by the following formula is 90% That's it.
  • the thickness recovery rate defined above may be simply referred to as “thickness recovery rate after 0.5 seconds”.
  • Thickness recovery rate (%) (thickness 0.5 seconds after releasing the compressed state) / (initial thickness) ⁇ 100
  • Initial thickness Thickness of foam sheet before applying load
  • Thickness 0.5 seconds after releasing compression Maintaining 120 seconds with 100 g / cm 2 applied to foam sheet, releasing compression The thickness of the foam sheet 0.5 seconds after release
  • the average cell diameter of the foamed sheet of the present invention is 10 to 200 ⁇ m as described above.
  • the lower limit is preferably 15 ⁇ m, more preferably 20 ⁇ m, and the upper limit is preferably 180 ⁇ m, more preferably 150 ⁇ m, and even more preferably 100 ⁇ m.
  • the average cell diameter is 10 ⁇ m or more, more excellent impact absorbability is exhibited.
  • the compression recovery property is excellent, and since it can return to the original thickness in a short time after receiving an impact, it is excellent in resistance to repeated impacts.
  • the maximum cell diameter of the foamed sheet is, for example, 40 to 400 ⁇ m, and the lower limit is preferably 60 ⁇ m, more preferably 80 ⁇ m, and the upper limit is preferably 300 ⁇ m, more preferably 220 ⁇ m.
  • the minimum cell diameter of the foamed sheet is, for example, 5 to 70 ⁇ m, and the lower limit is preferably 8 ⁇ m, more preferably 10 ⁇ m, and the upper limit is preferably 60 ⁇ m, more preferably 50 ⁇ m, and even more preferably 30 ⁇ m. .
  • Repulsive force upon compression of 50% the thickness of the foamed sheet of the present invention is 6.0 N / cm 2 or less as described above, preferably 4.0 N / cm 2 or less, more preferably 2.9 N / cm 2 or less, more preferably 2.5 N / cm 2 or less.
  • the repulsive force is 6.0 N / cm 2 or less, the foamed sheet of the present invention is more excellent in impact absorption.
  • the minimum of the said repulsive force is not specifically limited, 0.1 N / cm ⁇ 2 > is preferable.
  • the repulsion force at the time of 50% compression can be measured according to the compression hardness measurement method described in JIS K 6767.
  • the thickness recovery rate after 0.5 seconds of the foamed sheet of the present invention is 90% or more as described above, preferably 90.5% or more, more preferably 91% or more.
  • the foamed sheet of the present invention is excellent in resistance to repeated impact since the thickness recovery rate is 90% or more, and can return to the original thickness in a short time after receiving an impact. Moreover, it is also excellent in dustproofness and sealing performance.
  • the thickness recovery rate after 0.5 seconds is a recovery rate measured by applying a load to the foamed sheet with a certain area and compressing it. It is different from the dent recovery rate.
  • the thickness of the foam sheet of the present invention is not particularly limited, but is preferably 30 to 1000 ⁇ m.
  • the lower limit is preferably 40 ⁇ m, more preferably 50 ⁇ m, and the upper limit is preferably 700 ⁇ m, more preferably 500 ⁇ m, and even more preferably 300 ⁇ m.
  • the thickness of the foamed sheet is 30 ⁇ m or more, bubbles can be contained uniformly, and more excellent impact absorbability can be exhibited. Further, if the thickness of the foamed sheet is 1000 ⁇ m or less, it is possible to easily follow a minute clearance. When the thickness of the foamed sheet is within the above range, the shock absorbing property is excellent even though the thickness is small.
  • the density of the foamed sheet of the present invention is not particularly limited, but is preferably 0.2 to 0.7 g / cm 3 .
  • the lower limit is preferably 0.21 g / cm 3 , more preferably 0.22 g / cm 3
  • the upper limit is preferably 0.50 g / cm 3 , more preferably 0.40 g / cm 3 , still more preferably 0.00. 35 g / cm 3 .
  • the density is 0.2 g / cm 3 or more, it is easy to maintain the strength of the foamed sheet.
  • the density is 0.7 g / cm 3 or less, higher impact absorbability is exhibited. Further, when the density is in the range of 0.2 to 0.7 g / cm 3 , even higher impact absorbability is exhibited.
  • the density of the foam sheet (foam) means “apparent density”.
  • the ratio of the average cell diameter ( ⁇ m) to the thickness of the foamed sheet ( ⁇ m) is preferably in the range of 0.1 to 0.8.
  • the lower limit of the ratio of the average cell diameter ( ⁇ m) to the thickness of the foamed sheet ( ⁇ m) is preferably 0.15, more preferably 0.2, and the upper limit is preferably 0.75, more preferably 0.00. 6.
  • the peak top of the loss tangent (tan ⁇ ), which is the ratio between the storage elastic modulus and the loss elastic modulus at an angular frequency of 1 rad / s in the dynamic viscoelasticity measurement of the foamed sheet of the present invention, is not particularly limited, but is ⁇ 60 ° C. It is preferable that it exists in the range below 20 degreeC.
  • the lower limit of the temperature range where the peak tangent of the loss tangent exists is preferably ⁇ 50 ° C., more preferably ⁇ 40 ° C., still more preferably ⁇ 30 ° C., and the upper limit is preferably 10 ° C., more preferably 0 ° C. More preferably, it is ⁇ 10 ° C., particularly preferably ⁇ 15 ° C.
  • the peak top temperature of the loss tangent (tan ⁇ ) is within a range of ⁇ 50 to ⁇ 10 ° C., particularly ⁇ 30 to ⁇ 15 ° C.
  • the repulsive force when the thickness is compressed by 50% the above 0.5
  • Various characteristics of the foam sheet such as a thickness recovery rate after 2 seconds and a thickness recovery rate at a high temperature described later can be easily designed within the ranges described in the specification.
  • the peak top strength (maximum value) of the loss tangent (tan ⁇ ) in the range of ⁇ 60 ° C. or higher and 20 ° C. or lower is preferably higher from the viewpoint of shock absorption, for example, 0.2 or higher, preferably 0.3 or higher.
  • the upper limit value of the peak top intensity (maximum value) is, for example, 2.0.
  • the ratio of the peak top strength of the loss tangent (tan ⁇ ) to the density is preferably in the range of 1 to 5.
  • the lower limit of the ratio of the peak top intensity of the loss tangent (tan ⁇ ) to the density is preferably 1.5, more preferably 2, and the upper limit is preferably 4.5, more preferably 4, more preferably 3. It is.
  • the ratio of the peak top strength of the loss tangent (tan ⁇ ) to the density is within the above range, more excellent impact absorbability is exhibited.
  • the initial elastic modulus of the foamed sheet of the present invention is desirably low from the viewpoint of impact absorption.
  • the initial elastic modulus (value calculated from the slope at the time of 10% strain in a tensile test at an initial sample size of 10 mm width ⁇ 40 mm length and a tensile speed of 300 mm / min in a 23 ° C. environment) is preferably 5 N / mm 2 or less. More preferably 3 N / mm 2 or less, and still more preferably 1 N / mm 2 or less.
  • the lower limit value of the initial elastic modulus is, for example, 0.1 N / mm 2 .
  • the initial elastic modulus of the foamed sheet of the present invention is desirably low from the viewpoint of impact absorption.
  • the initial elastic modulus (value calculated from the slope at the time of 10% strain in a tensile test at an initial sample size of 10 mm width ⁇ 40 mm length and a tensile speed of 300 mm / min in a 0 ° C. environment) is preferably 5 N / mm 2 or less. More preferably 3 N / mm 2 or less, and still more preferably 1 N / mm 2 or less.
  • the lower limit value of the initial elastic modulus is, for example, 0.1 N / mm 2 .
  • the foamed sheet of the present invention is not particularly limited in its composition and cell structure as long as it has the above-mentioned characteristics.
  • the cell structure may be any of an open cell structure, a closed cell structure, and a semi-continuous semi-closed cell structure. From the viewpoint of impact absorption, an open cell structure and a semi-open semi-closed cell structure are preferable.
  • the foamed sheet of the present invention has excellent impact absorbability. In addition, it has high shock absorption even for very weak shocks, and exhibits excellent shock absorption regardless of the magnitude of the shock.
  • the impact absorption rate (%) defined by the following formula is divided by the thickness ( ⁇ m) of the foamed sheet to determine the impact absorption rate R per unit thickness.
  • Impact absorption rate (%) ⁇ (F 0 ⁇ F 1 ) / F 0 ⁇ ⁇ 100 (In the above formula, F 0 is the impact force when the impactor collides only with the support plate, and F 1 causes the impactor to collide with the support plate of the structure composed of the support plate and the foam sheet. Is the impact force when
  • the impact test apparatus 1 (pendulum tester 1) includes a holding member 3 as a holding means for holding the test piece 2 (foamed sheet 2) with an arbitrary holding force, and the test piece 2
  • An impact load member 4 for applying an impact stress to the test piece
  • a pressure sensor 5 as an impact force detection means for detecting an impact force of the impact load member 4 against the test piece 2 and the like.
  • the holding member 3 that holds the test piece 2 with an arbitrary holding force includes a fixing jig 11 and a holding jig 12 that is slidable so as to sandwich and hold the test piece 2 facing the fixing jig 11. It is configured.
  • the pressing jig 12 is provided with a pressing pressure adjusting means 16.
  • the impact load member 4 for applying an impact force to the test piece 2 held by the holding member 3 is supported so that one end 22 is pivotally supported with respect to the column 20 and an impactor 24 is provided on the other end side. It is composed of a rod 23 (shaft 23) and an arm 21 that lifts and holds the impactor 24 at a predetermined angle.
  • a steel ball is used as the impactor 24, it is possible to lift the impactor 24 integrally by a predetermined angle by providing an electromagnet 25 at one end of the arm.
  • the pressure sensor 5 that detects the impact force acting on the test piece 2 by the impact load member 4 is provided on the opposite side of the surface of the fixing jig 11 that contacts the test piece.
  • the impactor 24 is a steel ball (iron ball).
  • the angle at which the impactor 24 is lifted by the arm 21 is 40 °.
  • the weight of the steel ball (iron ball) is 66 g.
  • the test piece 2 is a highly elastic plate material such as a resin plate (acrylic plate, polycarbonate plate, etc.) or a metal plate between the fixing jig 11 and the holding jig 12. It is clamped via the support plate 28 configured.
  • the impact absorption rate is determined by impact force F 0 measured by causing the impactor 24 to collide with the support plate 28 after the fixing jig 11 and the support plate 28 are closely fixed using the impact test apparatus described above.
  • the impact force F 1 measured by causing the impactor 24 to collide with the support plate 28 after inserting the test piece 2 between the fixing jig 11 and the support plate 28 and fixing the test piece 2 tightly is calculated.
  • the Note that the impact test apparatus is the same apparatus as that of Example 1 of JP-A-2006-47277.
  • the impact force when the child collides is preferably 1000 N or less, more preferably 900 N or less, still more preferably 800 N or less, and particularly preferably 750 N or less.
  • the impact force is 1000 N or less, the impact absorbing ability of the foam sheet is more excellent.
  • the lower limit of the impact force is 0N or more, and may be 100N or more, 300N or more, or 500N or more.
  • the said impact force is an impact force of the initial stage foam sheet which has not received the big impact.
  • the x-axis and impact force (N) as y-axis are plotted at 5 points, and the slope of the linear approximation line obtained from the 5 points by the least square method is not particularly limited, but is preferably 10 or less, more preferably 5 Hereinafter, it is more preferably 1 or less, particularly preferably 0.5 or less.
  • the lower limit of the slope is, for example, ⁇ 5.
  • the first time Rate of increase of impact force at the time of the fifth collision (%) with respect to the impact force at the time of the collision Is preferably 5% or less, more preferably 3.5% or less, and still more preferably 2% or less.
  • the lower limit of the increase rate is, for example, ⁇ 10%.
  • the foam sheet of the present invention preferably has a thickness recovery rate at a high temperature defined below of 50% or more, more preferably 70%, more preferably 80%, still more preferably 90% or more, particularly Preferably it is 94% or more.
  • the thickness recovery rate at a high temperature defined below may be simply referred to as a “thickness recovery rate at a high temperature”. Thickness recovery rate at high temperature: The foamed sheet was compressed in the thickness direction so as to have a thickness of 50% of the initial thickness in an 80 ° C atmosphere, and after 22 hours, it was left in a 23 ° C atmosphere for 2 hours. Then, the compressed state is released, and the ratio of the thickness to the initial thickness after 24 hours from the release of the compressed state
  • the thickness recovery rate of the foamed sheet of the present invention is 50% or more at high temperature, impact is not caused even in a high temperature environment (for example, a temperature environment of 40 to 120 ° C.) in addition to a normal temperature environment.
  • the recovery speed of the thickness after the addition is fast, and the resistance to repeated impacts in a high temperature environment is excellent.
  • the foam sheet of this invention can be comprised with the resin composition containing a resin material (polymer).
  • the loss which is a ratio of the storage elastic modulus and the loss elastic modulus at an angular frequency of 1 rad / s in the dynamic viscoelasticity measurement of the resin composition in an unfoamed state [resin composition when not foamed (solid matter)]
  • the peak top of tangent (tan ⁇ ) is preferably in the range of ⁇ 60 ° C. to 20 ° C.
  • the lower limit of the temperature range where the peak tangent of the loss tangent exists is preferably ⁇ 50 ° C., more preferably ⁇ 40 ° C., still more preferably ⁇ 30 ° C., and the upper limit is preferably 10 ° C., more preferably 0 ° C. More preferably, it is ⁇ 10 ° C., particularly preferably ⁇ 15 ° C. (eg ⁇ 20 ° C.). In the case of a material having two or more peak tops of loss tangents, it is desirable that at least one of them falls within the above range.
  • the peak top strength of loss tangent (tan ⁇ ) within the range of ⁇ 60 ° C. to 20 ° C.
  • the peak tangent strength of loss tangent (tan ⁇ ) is equivalent to the value obtained by dividing the peak top strength by the density (g / cm 3 ) of the foam sheet.
  • the peak top strength of the loss tangent (tan ⁇ ) within the range of ⁇ 60 ° C. to 20 ° C. of the resin composition (solid material) is preferably 0.9 (g / cm 3 ) ⁇ 1 or more.
  • the upper limit is about 3, for example.
  • the initial elastic modulus (23 ° C., initial sample size 10 mm width ⁇ 40 mm length, tensile speed 300 mm / min) of the resin composition (solid material) in an unfoamed state is desirably lower, preferably 50 N / mm. 2 or less, more preferably 30 N / mm 2 or less.
  • the lower limit value of the initial elastic modulus is, for example, 0.3 N / mm 2 .
  • the initial elastic modulus (0 ° C., initial sample size 10 mm width ⁇ 40 mm length, tensile speed 300 mm / min) of the resin composition (solid material) in an unfoamed state is desirably lower, preferably 50 N / mm. 2 or less, more preferably 30 N / mm 2 or less.
  • the lower limit value of the initial elastic modulus is, for example, 0.3 N / mm 2 .
  • the solvent-insoluble content (gel fraction) of the foamed sheet of the present invention with respect to methyl ethyl ketone is not particularly limited, but is preferably 80% by weight or more, and more preferably 90% by weight or more.
  • the solvent insoluble content with respect to the said methyl ethyl ketone is 100 weight% or less normally.
  • the solvent insoluble content (gel fraction) with respect to methyl ethyl ketone is determined as follows. About 0.2 g of a sample is obtained from the foamed sheet, this sample is precisely weighed, and the weight obtained by the precise weighing is defined as “weight before storage (g)”. Next, this sample is put into 50 g of methyl ethyl ketone (MEK) and stored at room temperature for 5 days. Thereafter, the sample is taken out from methyl ethyl ketone, and the taken sample is dried at 130 ° C. for 1 hour. After drying, leave the sample at room temperature for 30 minutes, and then weigh the sample precisely. The weight obtained by this precise weighing is defined as “weight after storage (g)”.
  • MEK methyl ethyl ketone
  • solvent insoluble content with respect to methyl ethyl ketone is calculated from the following formula.
  • Solvent insoluble content (% by weight) with respect to methyl ethyl ketone (weight after storage) / (weight before storage) ⁇ 100
  • the resin material (polymer) constituting the foamed sheet of the present invention is not particularly limited, and a known or well-known resin material constituting the foam can be used.
  • the resin material include acrylic polymer, rubber, urethane polymer, and ethylene-vinyl acetate copolymer.
  • an acrylic polymer is preferable from the viewpoints that permanent set is small, heat resistance (resistance to deformation strain) is excellent, compressive load can be easily reduced, and shock absorption is excellent.
  • the resin material (polymer) constituting the foamed sheet may be one kind alone, or two or more kinds.
  • the Tg of the resin material (polymer) can be used as an index or a guide.
  • Tg is ⁇ 60 ° C. or higher and 20 ° C.
  • lower limit is preferably ⁇ 50 ° C., more preferably ⁇ 30 ° C.
  • upper limit is preferably 10 ° C., more preferably 0 ° C.
  • resin materials polymers in the range of ⁇ 10 ° C., particularly preferably ⁇ 15 ° C. (eg ⁇ 20 ° C.).
  • the peak top strength of loss tangent (tan ⁇ ), which is the ratio of storage elastic modulus and loss elastic modulus at an angular frequency of 1 rad / s in the dynamic viscoelasticity measurement of the resin material (polymer), is preferably 0.8 or more, More preferably, it is 1 or more, More preferably, it is 1.5 or more, Most preferably, it is 1.7 or more.
  • the peak top strength is large, the shock absorption is better.
  • the acrylic polymer is preferably an acrylic polymer formed with a monomer having a homopolymer Tg of ⁇ 10 ° C. or more and a monomer having a homopolymer Tg of less than ⁇ 10 ° C. as essential monomer components.
  • the ratio of the storage elastic modulus and loss elastic modulus at an angular frequency of 1 rad / s in dynamic viscoelasticity measurement is obtained by adjusting the amount ratio of the former monomer and the latter monomer.
  • a foamed sheet having a loss tangent (tan ⁇ ) peak top of ⁇ 60 ° C. or higher and 20 ° C. or lower can be obtained relatively easily.
  • glass transition temperature (Tg) when forming a homopolymer means “glass transition temperature (Tg of homopolymer of the monomer)”.
  • Tg of homopolymer glass transition temperature (Tg of homopolymer of the monomer).
  • the Tg of a homopolymer of a monomer not described in the above document refers to, for example, a value obtained by the following measurement method (see JP 2007-51271 A).
  • this homopolymer solution is cast-coated on a separator and dried to prepare a test sample (sheet-like homopolymer) having a thickness of about 2 mm.
  • This test sample was punched into a disk shape having a diameter of 7.9 mm, sandwiched between parallel plates, and subjected to a shear strain at a frequency of 1 Hz using a viscoelasticity tester (ARES, manufactured by Rheometrics). Viscoelasticity is measured in a shear mode at a heating rate of 150 ° C. and 5 ° C./min, and the peak top temperature of tan ⁇ is defined as Tg of the homopolymer.
  • the Tg of the resin material (polymer) can also be measured by this method.
  • the Tg is, for example, ⁇ 10 ° C. to 250 ° C., preferably 10 to 230 ° C., more preferably 50 to 200 ° C., and particularly preferably 100 to 200 ° C. .
  • Examples of the monomer having a Tg of ⁇ 10 ° C. or higher as the homopolymer include, for example, (meth) acrylonitrile; amide group-containing monomers such as (meth) acrylamide and N-hydroxyethyl (meth) acrylamide; homopolymers such as (meth) acrylic acid Carboxyl group-containing (meth) acrylic acid ester having a Tg of ⁇ 10 ° C. or higher; (meth) acrylic acid alkyl ester having a Tg of ⁇ 10 ° C.
  • a homopolymer such as methyl methacrylate or ethyl methacrylate
  • (meth) acrylic having a Tg of -10 ° C. or higher such as benzyl (meth) acrylate Acid aromatic ester
  • N-vinyl-2-pyrrolidone, acroylmorpholine 2-hydroxyethyl methacrylate hydroxyl group-containing monomers such as Le and the like
  • heterocycle-containing vinyl monomers These can be used individually by 1 type or in combination of 2 or more types.
  • monomers having a functional group such as a nitrogen atom-containing group such as a carboxyl group, a hydroxyl group, and a nitrile group are particularly preferable.
  • a functional group such as a nitrogen atom-containing group such as a carboxyl group, a hydroxyl group, and a nitrile group
  • Acrylonitrile and acrylic acid are particularly preferable.
  • the Tg is, for example, ⁇ 70 ° C. or more and less than ⁇ 10 ° C., preferably ⁇ 70 ° C. to ⁇ 12 ° C., more preferably ⁇ 65 ° C. to ⁇ 15 ° C. .
  • Examples of the homopolymer having a Tg of less than ⁇ 10 ° C. include (meth) acrylic acid alkyl esters having a homopolymer Tg of less than ⁇ 10 ° C., such as ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, etc. Is mentioned. These can be used individually by 1 type or in combination of 2 or more types. Among these, acrylic acid C 2-8 alkyl ester is preferable, and acrylic acid C 4-8 alkyl ester is particularly preferable.
  • the content of the monomer having a Tg of -10 ° C. or more of the homopolymer is, for example, 2 to 30% by weight with respect to all the monomer components forming the acrylic polymer (total amount of monomer components), and the lower limit is preferably 3% by weight. %, More preferably 4% by weight, and the upper limit is preferably 25% by weight, more preferably 20% by weight.
  • the content of the monomer having a Tg of the homopolymer of less than ⁇ 10 ° C. with respect to all the monomer components forming the acrylic polymer (total amount of monomer components) is, for example, 70 to 98% by weight, and the lower limit is preferably The upper limit is preferably 97% by weight, more preferably 96% by weight.
  • a (meth) acrylic acid alkyl ester having a linear or branched alkyl group having 4 to 8 carbon atoms as a monomer component for forming the acrylic polymer is used. 50% by weight or more (preferably 70% by weight or more, more preferably 80% by weight or more), and the homopolymer Tg is 10 ° C. or more, and a nitrogen atom-containing group such as carboxyl group, hydroxyl group, nitrile group, etc. It is preferable to contain 2 to 20 wt% (preferably 3 to 15 wt%, more preferably 5 to 10 wt%) of a monomer having a functional group.
  • the rubber may be either natural rubber or synthetic rubber.
  • the rubber include nitrile rubber (NBR), methyl methacrylate-butadiene rubber (MBR), styrene-butadiene rubber (SBR), acrylic rubber (ACM, ANM), urethane rubber (AU), and silicone rubber.
  • NBR nitrile rubber
  • MRR methyl methacrylate-butadiene rubber
  • SBR styrene-butadiene rubber
  • ACM acrylic rubber
  • AU urethane rubber
  • silicone rubber silicone rubber.
  • urethane polymer examples include polycarbonate polyurethane, polyester polyurethane, and polyether polyurethane.
  • ethylene-vinyl acetate copolymer a known or well-known ethylene-vinyl acetate copolymer can be used.
  • the foamed sheet of the present invention may contain a surfactant, a crosslinking agent, a thickener, a rust inhibitor, a silicone compound, and other additives as necessary.
  • a surfactant for compressing the thickness by 50% is 6.0 N / cm 2 or less, and the viewpoint that the foam recovery sheet having the thickness recovery rate after 0.5 seconds of 90% or more can be easily obtained. Therefore, it is preferable to contain a crosslinking agent and a silicone compound.
  • it is easier to design various properties of the foamed sheet such as the thickness recovery rate at high temperatures within the ranges described in the specification.
  • an optional surfactant may be included for the purpose of reducing the bubble diameter and stabilizing the foam.
  • the surfactant is not particularly limited, and any of an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, and the like may be used. From the viewpoint of the stability of the foam, an anionic surfactant is preferable, and a fatty acid ammonium surfactant such as ammonium stearate is more preferable.
  • Surfactant may be used individually by 1 type and may be used in combination of 2 or more type. Different surfactants may be used in combination, for example, an anionic surfactant and a nonionic surfactant, or an anionic surfactant and an amphoteric surfactant may be used in combination.
  • the addition amount of the surfactant exceeds, for example, 0 part by weight with respect to 100 parts by weight of the resin material (polymer) [solid content (nonvolatile content)].
  • the lower limit is preferably 0.5 parts by weight, and the upper limit is preferably 8 parts by weight.
  • the foamed sheet of the present invention can easily form a foamed sheet having a repulsive force of 6.0 N / cm 2 or less when the thickness is compressed by 50% and a thickness recovery rate of 0.5% or more after 90 seconds.
  • various properties of the foam sheet such as the thickness recovery rate at the above-mentioned high temperature are easily within the ranges described in the specification, respectively, and in order to improve the strength, heat resistance and moisture resistance of the foam sheet
  • Any cross-linking agent may be included.
  • the crosslinking agent is not particularly limited, and any of oil-soluble and water-soluble may be used.
  • crosslinking agent examples include epoxy-based, oxazoline-based, isocyanate-based, carbodiimide-based, melamine-based, silicone-based (for example, silane coupling agent), metal oxide-based, and the like.
  • crosslinking agent only 1 type may be used and 2 or more types may be used. Among these, it is preferable to include at least an oxazoline-based crosslinking agent.
  • the addition amount of the crosslinking agent exceeds 10 parts by weight with respect to 100 parts by weight of the resin material (polymer) [solid content (nonvolatile content)], for example.
  • the lower limit is preferably 0.01 parts by weight, and the upper limit is preferably 9 parts by weight.
  • an optional thickener may be included. It does not restrict
  • limit especially as a thickener An acrylic acid type, a urethane type, a polyvinyl alcohol type etc. are mentioned. Of these, polyacrylic acid thickeners and urethane thickeners are preferred.
  • the addition amount of the thickener exceeds, for example, 0 part by weight with respect to 100 parts by weight of the resin material (polymer) [solid content (nonvolatile content)].
  • the lower limit is preferably 0.1 parts by weight, and the upper limit is preferably 5 parts by weight.
  • an arbitrary rust inhibitor may be included to prevent corrosion of the metal member adjacent to the foam sheet.
  • an azole ring-containing compound is preferable. When an azole ring-containing compound is used, it is possible to achieve both high levels of corrosion prevention for metals and adhesion to adherends.
  • the azole ring-containing compound may be a compound having a 5-membered ring containing one or more nitrogen atoms in the ring, such as a diazole (imidazole, pyrazole) ring, triazole ring, tetrazole ring, oxazole ring, isoxazole. And compounds having a ring, a thiazole ring, or an isothiazole ring. These rings may be condensed with an aromatic ring such as a benzene ring to form a condensed ring.
  • Examples of the compound having such a condensed ring include a compound having a benzimidazole ring, a benzopyrazole ring, a benzotriazole ring, a benzoxazole ring, a benzoisoxazole ring, a benzothiazole ring, or a benzoisothiazole ring.
  • the azole ring and the condensed ring each may have a substituent.
  • substituents include alkyl groups having 1 to 6 carbon atoms (preferably 1 to 3 carbon atoms) such as methyl group, ethyl group, propyl group, isopropyl group and butyl group; methoxy group, ethoxy group, isopropyloxy
  • a compound in which an azole ring forms a condensed ring with an aromatic ring such as a benzene ring is preferable.
  • a benzotriazole compound (a compound having a benzotriazole ring), a benzothiazole compound ( A compound having a benzothiaazole ring) is particularly preferred.
  • benzotriazole compounds include 1,2,3-benzotriazole, methylbenzotriazole, carboxybenzotriazole, carboxymethylbenzotriazole, and 1- [N, N-bis (2-ethylhexyl) aminomethyl] benzotriazole.
  • 1- [N, N-bis (2-ethylhexyl) aminomethyl] methylbenzotriazole, 2,2 ′-[[(methyl-1H-benzotriazol-1-yl) methyl] imino] bisethanol, or these A sodium salt etc. are mentioned.
  • benzothiazole compound examples include 2-mercaptobenzothiazole, 3- (2- (benzothiazolyl) thio) propionic acid, or a sodium salt thereof.
  • the azole ring-containing compound may be used alone or in combination of two or more.
  • the addition amount of the rust preventive agent (for example, the above azole ring-containing compound) [solid content (nonvolatile content)] [solid content (nonvolatile content)] is within a range that does not impair the original properties of the foam.
  • 0.2 to 5 parts by weight is preferable with respect to 100 parts by weight of the resin material (polymer) [solid content (nonvolatile content)].
  • the lower limit is more preferably 0.3 parts by weight, still more preferably 0.4 parts by weight, and the upper limit is more preferably 3 parts by weight, still more preferably 2 parts by weight.
  • a silicone compound for example, a silicone-modified acrylic polymer, a silicone-modified urethane polymer, etc.
  • a silicone-modified polymer for example, a silicone-modified acrylic polymer, a silicone-modified urethane polymer, etc.
  • resin material polymer
  • silicone compound a silicone compound having a siloxane bond of 2000 or less is preferable.
  • examples of the silicone compound include silicone oil, modified silicone oil, and silicone resin.
  • silicone oil straight silicone oil
  • examples of silicone oil include dimethyl silicone oil and methylphenyl silicone oil.
  • modified silicone oil examples include polyether-modified silicone oil (polyether-modified dimethyl silicone oil, etc.), alkyl-modified silicone oil (alkyl-modified dimethyl silicone oil, etc.), aralkyl-modified silicone oil (aralkyl-modified dimethyl silicone oil, etc.), and higher fatty acids.
  • examples include ester-modified silicone oil (higher fatty acid ester-modified dimethyl silicone oil and the like), fluoroalkyl-modified silicone oil (fluoroalkyl-modified dimethyl silicone oil and the like), and the like.
  • polyether-modified silicone is preferred.
  • examples of commercially available polyether-modified silicone oils include “PEG11 methyl ether dimethicone”, “PEG / PPG-20 / 22 butyl ether dimethicone”, “PEG-9 methyl ether dimethicone”, “PEG-32 methyl ether dimethicone”, “ Linear type such as “PEG-9 dimethicone”, “PEG-3 dimethicone”, “PEG-10 dimethicone”; branched such as “PEG-9 polydimethylsiloxyethyl dimethicone”, “lauryl PEG-9 polydimethylsiloxyethyl dimethicone” Type (above, manufactured by Shin-Etsu Chemical Co., Ltd.) and the like.
  • the silicone resin includes straight silicone resin and modified silicone resin.
  • the straight silicone resin include methyl silicone resin and methylphenyl silicone resin.
  • the modified silicone resin include alkyd-modified silicone resin, epoxy-modified silicone resin, acrylic-modified silicone resin, and polyester-modified silicone resin.
  • the total content of the silicone compound and the silicone chain part present in the silicone-modified polymer in the foamed sheet of the present invention is non-volatile with respect to 100 parts by weight of the resin material (polymer) in the foamed sheet of the present invention. For example, 0.01 to 5 parts by weight in terms of minutes (solid content).
  • the lower limit of the total content is preferably 0.05 parts by weight, more preferably 0.1 parts by weight, and the upper limit is preferably 4 parts by weight, more preferably 3 parts by weight.
  • the total content of the silicone compound and the silicone chain portion present in the silicone-modified polymer in the foamed sheet of the present invention is, for example, 0.01 to 5 weights in terms of non-volatile content (solid content). %.
  • the lower limit of the total content is preferably 0.05% by weight, more preferably 0.1% by weight, and the upper limit is preferably 4% by weight, more preferably 3% by weight.
  • any appropriate other component may be included within the range not impairing the shock absorption.
  • Such other components may contain only 1 type and may contain 2 or more types.
  • the other components include polymer components other than those described above, softeners, antioxidants, anti-aging agents, gelling agents, curing agents, plasticizers, fillers, reinforcing agents, foaming agents, flame retardants, and light stability. Agents, ultraviolet absorbers, colorants (pigments, dyes, etc.), pH adjusters, solvents (organic solvents), thermal polymerization initiators, photopolymerization initiators, and the like.
  • the filler examples include silica, clay (mica, talc, smectite, etc.), alumina, titania, zinc oxide, tin oxide, zeolite, calcium carbonate, graphite, carbon nanotube, inorganic fiber (carbon fiber, glass fiber, etc.) , Organic fiber, metal powder (silver, copper, etc.) and the like.
  • piezoelectric particles such as titanium oxide
  • conductive particles such as boron nitride
  • organic fillers such as silicone powder
  • silica and calcium carbonate are preferable.
  • the thickness recovery rate at high temperatures can be further improved.
  • the content of the filler is preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the resin material (polymer) in the foamed sheet of the present invention.
  • the amount is preferably 0.8 to 6 parts by weight, more preferably 0.9 to 5 parts by weight.
  • the foam sheet of the present invention can be produced by subjecting a resin composition containing a constituent resin material (polymer) to foam molding.
  • foaming method bubble forming method
  • methods usually used for foam molding such as physical methods and chemical methods, can be employed.
  • the foam sheet of the present invention may be a foam (physical foam) formed by foaming by a physical method, or a foam (chemical foam) formed by foaming by a chemical method. It may be.
  • a physical method is a method in which gas components such as air and nitrogen are dispersed in a polymer solution and bubbles are formed by mechanical mixing (mechanical foam).
  • the chemical method is a method of obtaining a foam by forming cells with a gas generated by thermal decomposition of a foaming agent added to a polymer base. From the viewpoint of environmental problems, a physical method is preferable. Bubbles formed by physical methods are often open cells.
  • the resin composition containing the resin material (polymer) to be subjected to foam molding a resin solution in which the resin material is dissolved in a solvent may be used. From the viewpoint of cellularity, it is preferable to use an emulsion containing the resin material. . That is, the foam sheet of the present invention is preferably a foam of the emulsion resin composition. As an emulsion, you may blend and use 2 or more types of emulsion. Moreover, the said resin composition may be preserve
  • the solid content concentration of the emulsion is preferably higher from the viewpoint of film formability.
  • the solid content concentration of the emulsion is preferably 30% by weight or more, more preferably 40% by weight or more, and further preferably 50% by weight or more.
  • a method of producing a foam through a step of foaming the emulsion resin composition mechanically (Step A) is preferable. That is, the foam sheet of the present invention is preferably a mechanical foam of an emulsion resin composition.
  • the foaming device is not particularly limited, and examples thereof include a high-speed shearing method, a vibration method, and a pressurized gas discharge method. Among these, the high-speed shearing method is preferable from the viewpoint of finer bubble diameter and production of a large capacity.
  • Bubbles when foamed by mechanical stirring are gas (gas) taken into the emulsion.
  • the gas is not particularly limited as long as it is inert with respect to the emulsion, and examples thereof include air, nitrogen, carbon dioxide and the like. Among these, air is preferable from the viewpoint of economy.
  • the foamed sheet of the present invention can be obtained through a step (Step B) in which the emulsion resin composition foamed by the above method is applied onto a substrate and dried.
  • a step (Step B) in which the emulsion resin composition foamed by the above method is applied onto a substrate and dried.
  • the peeled plastic film peeled polyethylene terephthalate film etc.
  • the plastic film polyethylene terephthalate film etc.
  • a heat conductive layer after-mentioned heat conductive layer
  • the adhesion between the foamed sheet and the heat conductive layer can be improved, and the efficiency of the drying process during the preparation of the foamed sheet can also be improved.
  • Step B a general method can be adopted as a coating method and a drying method.
  • Step B includes a preliminary drying step B1 for drying the bubble-containing emulsion resin composition applied on the substrate at 50 ° C. or higher and lower than 125 ° C., and then a main drying step B2 for further drying at 125 ° C. or higher and 200 ° C. or lower. Preferably it is.
  • the temperature in the preliminary drying step B1 is preferably 50 ° C. or higher and 100 ° C. or lower.
  • the time of the preliminary drying step B1 is, for example, 0.5 minutes to 30 minutes, preferably 1 minute to 15 minutes. Moreover, the temperature in this drying process B2 becomes like this.
  • the main drying step B2 is, for example, 0.5 minutes to 30 minutes, preferably 1 minute to 15 minutes.
  • a foam sheet having an average cell diameter in the range of 10 to 200 ⁇ m can be obtained by adjusting the type and amount of the surfactant, and adjusting the stirring speed and stirring time during mechanical stirring.
  • a foamed sheet having a density of 0.2 to 0.7 g / cm 3 can be obtained by adjusting the amount of gas (gas) component taken into the emulsion resin composition during mechanical stirring.
  • the foamed sheet of the present invention may have an adhesive layer (adhesive layer) on one or both sides of the foamed sheet. It does not specifically limit as an adhesive which comprises an adhesive layer, For example, any of an acrylic adhesive, a rubber adhesive, a silicone adhesive, etc. may be sufficient. Moreover, when providing an adhesive layer, you may laminate
  • the foamed sheet of the present invention has a shear adhesive force (measurement conditions: 23 ° C., tensile speed 50 mm / min) of at least one surface of the foamed sheet of 0.5 N / 100 mm 2 or more to the SUS304BA plate.
  • other members for example, a heat conductive layer
  • the above-mentioned other members will not be peeled off without providing an adhesive layer on the foamed sheet, and the effect of preventing displacement can be obtained.
  • the thickness of the laminated body of a foam sheet and another member can be made small, and it can contribute to further thickness reduction of the electrical and electronic equipment etc.
  • the manufacturing efficiency of the laminate can be improved and the cost can be reduced.
  • other member / foam sheet, other member / adhesive layer / foam sheet, foam sheet / Other members / foamed sheets, foamed sheets / adhesive layers / other members / adhesive layers / foamed sheets and the like can be mentioned.
  • the shear adhesive force of the foamed sheet of the present invention to the SUS304BA plate is, for example, the type of monomer constituting the resin material (polymer) constituting the foamed sheet of the present invention and its composition It can be adjusted by selecting the ratio.
  • the Tg of the homopolymer is less than ⁇ 10 ° C. (for example, ⁇ 70 ° C. or more and less than ⁇ 10 ° C., preferably ⁇ 70 The monomer having a temperature of from ⁇ 12 ° C.
  • the shear adhesive strength of the foamed sheet to the SUS304BA plate is reduced to 0 .5 N / 100 mm 2 or more.
  • the lower limit of the shear adhesive strength of the foamed sheet of the present invention to the SUS304BA plate is preferably 0.5 N / 100 mm 2 , more preferably 0.7 N / 100 mm 2 .
  • the upper limit of the shear adhesive force is not particularly limited, but is, for example, 100 N / 100 mm 2 .
  • the foamed sheet of the present invention may be distributed on the market as a wound body (rolled material) wound in a roll shape.
  • the foamed sheet of the present invention is excellent in resistance to repeated impacts while being excellent in impact absorption. For this reason, for example, in electrical and electronic equipment, various members or parts (for example, optical members and the like) are used when attaching (attaching) to a predetermined part (for example, a casing or the like), particularly members for electrical and electronic equipment. It is useful as a shock absorbing sheet. Since the foamed sheet of the present invention is used, the electrical / electronic device of the present invention is not easily damaged by an impact at the time of dropping, and is not easily damaged when repeatedly subjected to an impact.
  • the foamed sheet of the present invention is excellent in shock absorption and resistance to repeated impacts even when the thickness is very thin, the electric and electronic device of the present invention can be reduced in size and thickness. It is difficult to break due to impact when dropped, and is also difficult to break when repeatedly impacted.
  • Electrical and electronic equipment refers to equipment corresponding to at least one of electrical equipment and electronic equipment.
  • an image display member attached to an image display device such as a liquid crystal display, an electroluminescence display, a plasma display (particularly, a small image display).
  • display members such as touch panels attached to mobile communication devices such as so-called “mobile phones”, “smartphones” and “portable information terminals”, cameras and lenses (particularly small cameras and lenses), etc.
  • mobile communication devices such as so-called “mobile phones”, “smartphones” and “portable information terminals”, cameras and lenses (particularly small cameras and lenses), etc.
  • the foamed sheet of the present invention is used for the electrical and electronic equipment of the present invention.
  • an electric / electronic device is, for example, an electric / electronic device provided with a display member, wherein the foam sheet is sandwiched between a casing of the electric / electronic device and the display member.
  • Examples of the electric and electronic devices include mobile communication devices such as so-called “mobile phones”, “smartphones”, and “portable information terminals”.
  • the foam sheet of the present invention when used in a touch panel mounted device, even if the display panel or the touch panel bends and deforms due to the user's touch operation, the force generated by the deformation is effectively reduced. Can be dispersed and absorbed. Therefore, the foamed sheet of the present invention can highly suppress the occurrence of display unevenness (ripple-like blurring pattern) in the display unit that may be caused by stress applied to the display panel. For this reason, the foam sheet of this invention can be preferably used for a touch panel mounting apparatus.
  • the touch panel-equipped device refers to a device having a display panel and equipped with a touch panel.
  • the touch panel-equipped device is not particularly limited.
  • Various displays (monitors) such as displays and electroluminescence displays (organic EL displays); portable game machines; digital audio players; electronic book readers (devices for viewing electronic books, terminals dedicated to electronic books); wearable computers (wearable devices) ; Digital signage (electronic signboards); Automatic teller machines (ATMs); Automatic ticket machines and vending machines used for sales of tickets, various cash vouchers, beverages, food, tobacco, magazines, newspapers, etc.
  • a television receiver (TV) such as an electronic blackboard (interactive whiteboard), and the like.
  • the touch panel-mounted device of the present invention uses the foamed sheet of the present invention.
  • a touch panel mounting device for example, a device having the foam sheet, a display panel, and a touch panel, in which the foam sheet is disposed in a space on the back side of the display panel can be mentioned.
  • the foamed sheet of the present invention is used for the touch panel-mounted device of the present invention, the touch panel mounted device is not easily damaged by an impact when dropped, and is not easily damaged when repeatedly subjected to an impact.
  • the foamed sheet of the present invention is excellent in shock absorption and resistance to repeated impacts even when the thickness is very thin. Therefore, the touch-panel-equipped device of the present invention is small and thin. It is difficult to break due to impact when dropped, and is also difficult to break when repeatedly impacted.
  • the occurrence of display unevenness in the display unit due to the user's touch operation is highly suppressed.
  • % representing the content means% by weight.
  • all the compounding parts are values in terms of solid content (non-volatile content).
  • Example 1 100 parts by weight of acrylic emulsion solution (solid content 57%, butyl acrylate-methyl methacrylate-acrylonitrile-acrylic acid copolymer (weight ratio 91: 4: 3: 2)), fatty acid ammonium surfactant (ammonium stearate) Water dispersion, solid content 33%)
  • surfactant A 1.5 parts by weight, carboxybetaine type amphoteric surfactant ("Amogen CB-H", manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
  • surfactant B 1.0 part by weight, 0.35 part by weight of an oxazoline-based crosslinking agent (“Epocross WS-500”, manufactured by Nippon Shokubai Co., Ltd., solid content 39%), polyacrylic acid thickener (ethyl acrylate— Acrylic acid copolymer (acrylic acid 20%), solid content 28.7% 0.78 parts by weight, lubricant (modified silicone oil, “X-22-163C”, Shin-Ets
  • This foamed composition was applied onto a release-treated PET (polyethylene terephthalate) film (thickness: 38 ⁇ m, trade name “MRF # 38”, manufactured by Mitsubishi Plastics, Inc.), at 80 ° C. for 5 minutes, and at 140 ° C. It was dried for 5 minutes to obtain a foam (foamed sheet) having an open cell structure having a thickness of 150 ⁇ m, a density of 0.31 g / cm 3 , a maximum cell diameter of 110 ⁇ m, a minimum cell diameter of 20 ⁇ m, and an average cell diameter of 45 ⁇ m.
  • Example 2 100 parts by weight of acrylic emulsion solution (solid content 57%, butyl acrylate-methyl methacrylate-acrylonitrile-acrylic acid copolymer (weight ratio 91: 4: 3: 2)), fatty acid ammonium surfactant (ammonium stearate) Water dispersion, solid content 33%)
  • surfactant A 1.5 parts by weight, carboxybetaine type amphoteric surfactant ("Amogen CB-H", manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
  • surfactant B 1.0 part by weight, 2.0 parts by weight of an oxazoline-based crosslinking agent (Epocross WS-500, manufactured by Nippon Shokubai Co., Ltd., solid content 39%), polyacrylic acid thickener (ethyl acrylate- 1.5 parts by weight of acrylic acid copolymer (acrylic acid 20%), solid content 28.7%), lubricant (modified silicone oil, “X-22-163C”, Shin-Etsu
  • Etsu Chemical Co., Ltd. 1.0 parts by weight of the disperser was caused blowing and stirring and mixing in ( "Robo mix", PRIMIX Co., Ltd.).
  • This foamed composition was applied onto a release-treated PET (polyethylene terephthalate) film (thickness: 38 ⁇ m, trade name “MRF # 38”, manufactured by Mitsubishi Plastics, Inc.), at 80 ° C. for 5 minutes, and at 140 ° C.
  • foam foam (foamed sheet) having an open cell structure having a thickness of 200 ⁇ m, a density of 0.25 g / cm 3 , a maximum cell diameter of 110 ⁇ m, a minimum cell diameter of 20 ⁇ m, and an average cell diameter of 40 ⁇ m.
  • Example 3 100 parts by weight of acrylic emulsion solution (solid content 57%, butyl acrylate-methyl methacrylate-acrylonitrile-acrylic acid copolymer (weight ratio 91: 4: 3: 2)), fatty acid ammonium surfactant (ammonium stearate) Water dispersion, solid content 33%)
  • surfactant A 1.5 parts by weight, carboxybetaine type amphoteric surfactant ("Amogen CB-H", manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
  • surfactant B 1.0 part by weight, 1.0 part by weight of an oxazoline-based crosslinking agent (Epocross WS-500, manufactured by Nippon Shokubai Co., Ltd., solid content 39%), polyacrylic acid thickener (ethyl acrylate- 1.0 part by weight of acrylic acid copolymer (acrylic acid 20%), solid content 28.7%), lubricant (modified silicone oil, “X-22-163C”, Shin-Et
  • Etsu Chemical Co., Ltd. 1.0 parts by weight of the disperser was caused blowing and stirring and mixing in ( "Robo mix", PRIMIX Co., Ltd.).
  • This foamed composition was applied onto a release-treated PET (polyethylene terephthalate) film (thickness: 38 ⁇ m, trade name “MRF # 38”, manufactured by Mitsubishi Plastics, Inc.), at 80 ° C. for 5 minutes, and at 140 ° C.
  • foam foam (foamed sheet) having an open cell structure having a thickness of 80 ⁇ m, a density of 0.35 g / cm 3 , a maximum cell diameter of 60 ⁇ m, a minimum cell diameter of 20 ⁇ m, and an average cell diameter of 40 ⁇ m.
  • Example 4 100 parts by weight of acrylic emulsion solution (solid content 57%, butyl acrylate-methyl methacrylate-acrylonitrile-acrylic acid copolymer (weight ratio 91: 4: 3: 2)), fatty acid ammonium surfactant (ammonium stearate) Water dispersion, solid content 33%)
  • surfactant A 1.5 parts by weight, carboxybetaine type amphoteric surfactant ("Amogen CB-H", manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
  • surfactant B 1.0 part by weight, 1.0 part by weight of an oxazoline-based crosslinking agent (Epocross WS-500, manufactured by Nippon Shokubai Co., Ltd., solid content 39%), polyacrylic acid thickener (ethyl acrylate- 1.0 part by weight of acrylic acid copolymer (acrylic acid 20%), solid content 28.7%), lubricant (modified silicone oil, “X-22-163C”, Shin-Et
  • Etsu Chemical Co., Ltd. 1.0 parts by weight of the disperser was caused blowing and stirring and mixing in ( "Robo mix", PRIMIX Co., Ltd.).
  • This foamed composition was applied onto a release-treated PET (polyethylene terephthalate) film (thickness: 38 ⁇ m, trade name “MRF # 38”, manufactured by Mitsubishi Plastics, Inc.), at 80 ° C. for 5 minutes, and at 140 ° C.
  • foam foam (foamed sheet) having an open cell structure having a thickness of 300 ⁇ m, a density of 0.24 g / cm 3 , a maximum cell diameter of 120 ⁇ m, a minimum cell diameter of 30 ⁇ m, and an average cell diameter of 50 ⁇ m.
  • Example 5 100 parts by weight of acrylic emulsion solution (solid content 57%, butyl acrylate-methyl methacrylate-acrylonitrile-acrylic acid copolymer (weight ratio 91: 4: 3: 2)), fatty acid ammonium surfactant (ammonium stearate) Water dispersion, solid content 33%)
  • surfactant A 1.5 parts by weight, carboxybetaine type amphoteric surfactant ("Amogen CB-H", manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
  • surfactant B 1.0 part by weight, 1.0 part by weight of an oxazoline-based crosslinking agent (Epocross WS-500, manufactured by Nippon Shokubai Co., Ltd., solid content 39%), polyacrylic acid thickener (ethyl acrylate- 1.0 part by weight of acrylic acid copolymer (acrylic acid 20%), solid content 28.7%), lubricant (modified silicone oil, “X-22-163C”, Shin-Et
  • the resultant was dried for 5 minutes to obtain a foam (foamed sheet) having an open cell structure having a thickness of 150 ⁇ m, a density of 0.30 g / cm 3 , a maximum cell diameter of 110 ⁇ m, a minimum cell diameter of 20 ⁇ m, and an average cell diameter of 45 ⁇ m.
  • Example 6 100 parts by weight of acrylic emulsion solution (solid content 57%, butyl acrylate-methyl methacrylate-acrylonitrile-acrylic acid copolymer (weight ratio 91: 4: 3: 2)), fatty acid ammonium surfactant (ammonium stearate) Water dispersion, solid content 33%)
  • surfactant A 1.5 parts by weight, carboxybetaine type amphoteric surfactant ("Amogen CB-H", manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
  • surfactant B 1.0 part by weight, 1.0 part by weight of an oxazoline-based crosslinking agent (Epocross WS-500, manufactured by Nippon Shokubai Co., Ltd., solid content 39%), polyacrylic acid thickener (ethyl acrylate- 1.0 part by weight of acrylic acid copolymer (acrylic acid 20%), solid content 28.7%), lubricant (modified silicone oil, “X-22-163C”, Shin-Et
  • the resultant was dried for 5 minutes to obtain a foam (foamed sheet) having an open cell structure having a thickness of 150 ⁇ m, a density of 0.30 g / cm 3 , a maximum cell diameter of 110 ⁇ m, a minimum cell diameter of 20 ⁇ m, and an average cell diameter of 45 ⁇ m.
  • Comparative Example 1 100 parts by weight of acrylic emulsion solution (solid content 55%, ethyl acrylate-butyl acrylate-acrylonitrile copolymer (weight ratio 45: 48: 7)), fatty acid ammonium surfactant (aqueous dispersion of ammonium stearate, (Solid content 33%) (surfactant A) 1.5 parts by weight, carboxybetaine type amphoteric surfactant (“Amogen CB-H”, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) (surfactant B) 1.0 Parts by weight, 0.35 parts by weight of an oxazoline-based crosslinking agent (Epocross WS-500, manufactured by Nippon Shokubai Co., Ltd., solid content 39%), polyacrylic acid thickener (ethyl acrylate-acrylic acid copolymer) 0.78 parts by weight (acrylic acid 20%), solid content 28.7%) was stirred and mixed with a disper (“Robomix”, manufactured
  • This foamed composition was applied onto a release-treated PET (polyethylene terephthalate) film (thickness: 38 ⁇ m, trade name “MRF # 38”, manufactured by Mitsubishi Plastics, Inc.), at 80 ° C. for 5 minutes, and at 140 ° C. It was dried for 5 minutes to obtain a foam (foamed sheet) having an open cell structure having a thickness of 150 ⁇ m, a density of 0.32 g / cm 3 , a maximum cell diameter of 110 ⁇ m, a minimum cell diameter of 20 ⁇ m, and an average cell diameter of 45 ⁇ m.
  • Comparative Example 2 100 parts by weight of acrylic emulsion solution (solid content 55%, ethyl acrylate-butyl acrylate-acrylonitrile copolymer (weight ratio 45: 48: 7)), fatty acid ammonium surfactant (aqueous dispersion of ammonium stearate, (Solid content 33%) (surfactant A) 1.5 parts by weight, carboxybetaine type amphoteric surfactant (“Amogen CB-H”, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) (surfactant B) 1.0 Disperse 0.3 parts by weight of oxazoline-based crosslinking agent (“Epocross WS-500”, manufactured by Nippon Shokubai Co., Ltd., solid content 39%) and 25 parts by weight of filler (silica particles, average particle size: 5 ⁇ m) ("Robomix", manufactured by Primics Co., Ltd.) was stirred and mixed to foam.
  • oxazoline-based crosslinking agent (“E
  • This foamed composition was applied onto a release-treated PET (polyethylene terephthalate) film (thickness: 38 ⁇ m, trade name “MRF # 38”, manufactured by Mitsubishi Plastics, Inc.), at 80 ° C. for 5 minutes, and at 140 ° C. It was dried for 5 minutes to obtain a foam (foamed sheet) having an open cell structure having a thickness of 150 ⁇ m, a density of 0.31 g / cm 3 , a maximum cell diameter of 110 ⁇ m, a minimum cell diameter of 20 ⁇ m, and an average cell diameter of 45 ⁇ m.
  • acrylic lubricant trade name “Metablene L-1000”, manufactured by Mitsubishi Rayon Co., Ltd.
  • the obtained foam was sliced to obtain an open cell foam (foam sheet) having a thickness of 200 ⁇ m, a density of 0.07 g / cm 3 , a maximum cell diameter of 80 ⁇ m, a minimum cell diameter of 20 ⁇ m, and an average cell diameter of 30 ⁇ m.
  • An average cell diameter ( ⁇ m) was obtained by capturing an enlarged image of the foam cross section with a low vacuum scanning electron microscope (“S-3400N scanning electron microscope”, manufactured by Hitachi High-Tech Science Systems Co., Ltd.) and analyzing the image. .
  • the number of bubbles analyzed is about 10 to 20.
  • the minimum cell diameter (micrometer) and the maximum cell diameter (micrometer) of the foam sheet were calculated
  • a foam (foamed sheet) is punched with a 100 mm ⁇ 100 mm punching blade mold, and the dimensions of the punched sample are measured. Further, the thickness is measured with a 1/100 dial gauge having a measurement terminal diameter ( ⁇ ) of 20 mm. The volume of the foam was calculated from these values. Next, the weight of the foam is measured with an upper pan balance having a minimum scale of 0.01 g or more. From these values, the density (g / cm 3 ) of the foam was calculated.
  • Thickness recovery rate The foam was cut into a width: 25 mm and a length: 40 mm to obtain a sheet-like test piece. 1 kg (100 g per cm 2 ) of this test piece in the thickness direction under an atmosphere of 23 ° C. using an electromagnetic force type micro testing machine (micro servo) (trade name “MMT-250”, manufactured by Shimadzu Corporation) ) And the compressed state was maintained for 120 seconds. In a 23 ° C atmosphere, the compressed state is released, and the foam thickness recovery behavior (thickness change, thickness recovery) is shot with a high-speed camera (high-speed camera). The thickness of the foam after 5 seconds was determined. And the recovery rate was calculated
  • required from the following formula. The evaluation results are shown in the column of “Thickness recovery rate” in Table 1. Thickness recovery rate (%) (thickness 0.5 seconds after releasing the compressed state) / (initial thickness) ⁇ 100
  • the impact force (N) at the time of each collision is plotted at five points with the number of impacts as the x-axis and the impact force (N) as the y-axis, and a linear approximation straight line obtained by the least square method is obtained from the five points. The inclination was obtained.
  • the evaluation results are shown in the column of “Slope of repeated impact force” in Table 1.
  • the foam was cut into a width of 30 mm and a length of 30 mm to obtain a sheet-like test piece.
  • the thickness of this test piece was accurately measured and designated as thickness a.
  • the test piece is made of two compression plates (aluminum plates) with a spacer (the thickness of the spacer) from the both sides of the test piece in the thickness direction so that the thickness is 50% of the initial thickness.
  • c) ie 50% compression state
  • this compression state was maintained and stored for 22 hours under conditions of 50% humidity and 80 ° C. After 22 hours, it was stored in an atmosphere at 23 ° C. for 2 hours, after which the test piece was uncompressed and left for 24 hours.
  • Thickness recovery rate at high temperature (1 ⁇ (thickness a ⁇ thickness b) / (thickness a ⁇ thickness c)) ⁇ 100
  • the thickness a and the thickness b were measured in an environment where the temperature was 23 ⁇ 2 ° C. and the relative humidity was 50 ⁇ 5%.
  • the average cell diameter is 10 to 200 ⁇ m
  • the repulsive force when the thickness is compressed by 50% is 6.0 N / cm 2 or less
  • the thickness after the above 0.5 second The recovery rate was 90% or more, indicating high shock absorption, and at the time of the fifth collision, the same level of shock absorption as in the first collision was exhibited.
  • the thickness recovery rate after 0.5 seconds was not 90% or more, and the shock absorption was larger at the time of the fifth collision than at the time of the first collision. It was falling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention fournit une feuille de mousse qui présente d'excellentes propriétés d'absorption des chocs, et également une excellente résistance aux chocs répétés. La feuille de mousse de l'invention est caractéristique en ce qu'elle présente un diamètre cellulaire moyen compris entre 10 et 200μｍ, une force de répulsion lors d'une compression de 50% de l'épaisseur inférieure ou égale à ６,０Ｎ／ｃｍ 2, et un taux de rétablissement d'épaisseur défini par la formule ci-après supérieur ou égal à 90%. Taux de rétablissement d'épaisseur (%) = (épaisseur après 0,5 seconde à partir de la libération de l'état de compression) / (épaisseur initiale) ×１００. Épaisseur initiale : épaisseur de la feuille de mousse avant application de la charge. Épaisseur après 0,5 seconde à partir de la libération de l'état de compression : épaisseur de la feuille de mousse après 0,5 seconde à partir de la libération après maintien pendant 120 secondes dans un état dans lequel une charge de １００ｇ／ｃｍ 2 est appliquée sur la feuille de mousse, et libération de cette compression.
PCT/JP2017/024785 2016-08-01 2017-07-06 Feuille de mousse, appareil électrique/électronique, et appareil de montage de panneau tactile WO2018025568A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US16/322,776 US20210178734A1 (en) 2016-08-01 2017-07-06 Foamed sheet, electric or electronic device, and device with touch screen
CN201780060323.1A CN109790317B (zh) 2016-08-01 2017-07-06 发泡片、电气电子设备、及装设有触摸面板的设备
KR1020197005523A KR102414406B1 (ko) 2016-08-01 2017-07-06 발포 시트, 전기 전자 기기 및 터치 패널 탑재 기기

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2016-151180 2016-08-01
JP2016151180 2016-08-01
JP2017-130712 2017-07-03
JP2017130712A JP6956544B2 (ja) 2016-08-01 2017-07-03 発泡シート、電気電子機器、及びタッチパネル搭載機器

Publications (1)

Publication Number Publication Date
WO2018025568A1 true WO2018025568A1 (fr) 2018-02-08

Family

ID=61073574

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/024785 WO2018025568A1 (fr) 2016-08-01 2017-07-06 Feuille de mousse, appareil électrique/électronique, et appareil de montage de panneau tactile

Country Status (2)

Country Link
CN (1) CN109790317B (fr)
WO (1) WO2018025568A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019187388A1 (fr) * 2018-03-26 2019-10-03 日東電工株式会社 Feuille de mousse
WO2019187387A1 (fr) * 2018-03-26 2019-10-03 日東電工株式会社 Feuille de mousse
JP2019167483A (ja) * 2018-03-26 2019-10-03 日東電工株式会社 発泡シート
WO2020013258A1 (fr) * 2018-07-11 2020-01-16 積水化学工業株式会社 Feuille absorbant les chocs
EP3950791A4 (fr) * 2019-03-27 2022-12-07 Zeon Corporation Composition pour une feuille en mousse auto-adsorbante et feuille stratifiée en mousse auto-adsorbante

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013018582A1 (fr) * 2011-08-02 2013-02-07 日東電工株式会社 Mousse résinique et son procédé de production
WO2015029879A1 (fr) * 2013-08-26 2015-03-05 日東電工株式会社 Feuille de mousse
JP2015042708A (ja) * 2013-08-26 2015-03-05 日東電工株式会社 発泡シート
JP2015110781A (ja) * 2013-08-26 2015-06-18 日東電工株式会社 発泡シート
WO2016047612A1 (fr) * 2014-09-24 2016-03-31 日東電工株式会社 Feuille en mousse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013018582A1 (fr) * 2011-08-02 2013-02-07 日東電工株式会社 Mousse résinique et son procédé de production
WO2015029879A1 (fr) * 2013-08-26 2015-03-05 日東電工株式会社 Feuille de mousse
JP2015042708A (ja) * 2013-08-26 2015-03-05 日東電工株式会社 発泡シート
JP2015110781A (ja) * 2013-08-26 2015-06-18 日東電工株式会社 発泡シート
WO2016047612A1 (fr) * 2014-09-24 2016-03-31 日東電工株式会社 Feuille en mousse
WO2016047611A1 (fr) * 2014-09-24 2016-03-31 日東電工株式会社 Feuille de mousse

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7128004B2 (ja) 2018-03-26 2022-08-30 日東電工株式会社 発泡シート
WO2019187387A1 (fr) * 2018-03-26 2019-10-03 日東電工株式会社 Feuille de mousse
JP2019167484A (ja) * 2018-03-26 2019-10-03 日東電工株式会社 発泡シート
JP2019167483A (ja) * 2018-03-26 2019-10-03 日東電工株式会社 発泡シート
WO2019187386A1 (fr) * 2018-03-26 2019-10-03 日東電工株式会社 Feuille de mousse
JP2019167485A (ja) * 2018-03-26 2019-10-03 日東電工株式会社 発泡シート
WO2019187388A1 (fr) * 2018-03-26 2019-10-03 日東電工株式会社 Feuille de mousse
CN111902506B (zh) * 2018-03-26 2023-03-10 日东电工株式会社 发泡片
CN111902506A (zh) * 2018-03-26 2020-11-06 日东电工株式会社 发泡片
US11511511B2 (en) 2018-03-26 2022-11-29 Nitto Denko Corporation Foam sheet
WO2020013258A1 (fr) * 2018-07-11 2020-01-16 積水化学工業株式会社 Feuille absorbant les chocs
JP2021183695A (ja) * 2018-07-11 2021-12-02 積水化学工業株式会社 衝撃吸収シート
JPWO2020013258A1 (ja) * 2018-07-11 2020-09-17 積水化学工業株式会社 衝撃吸収シート
JP7332656B2 (ja) 2018-07-11 2023-08-23 積水化学工業株式会社 衝撃吸収シート
EP3950791A4 (fr) * 2019-03-27 2022-12-07 Zeon Corporation Composition pour une feuille en mousse auto-adsorbante et feuille stratifiée en mousse auto-adsorbante

Also Published As

Publication number Publication date
CN109790317A (zh) 2019-05-21
CN109790317B (zh) 2021-12-31

Similar Documents

Publication Publication Date Title
JP5801946B2 (ja) 発泡シート
JP6082498B2 (ja) 発泡シート
WO2018025568A1 (fr) Feuille de mousse, appareil électrique/électronique, et appareil de montage de panneau tactile
JP6956544B2 (ja) 発泡シート、電気電子機器、及びタッチパネル搭載機器
JP6386832B2 (ja) 発泡シート
KR20160048035A (ko) 발포 시트
JP6632891B2 (ja) 低粘着性発泡シート
JP6343478B2 (ja) 積層体及びその製造方法
KR101500467B1 (ko) 적층체
JP6178937B1 (ja) 発泡シート、電気電子機器、及びタッチパネル搭載機器
WO2016121788A1 (fr) Feuille en mousse faiblement adhésive

Legal Events

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

Ref document number: 17836675

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20197005523

Country of ref document: KR

Kind code of ref document: A

122 Ep: pct application non-entry in european phase

Ref document number: 17836675

Country of ref document: EP

Kind code of ref document: A1