[go: up one dir, main page]

WO2013180028A1 - Mousse de résine thermoplastique et produit d'étanchéité à base de mousse - Google Patents

Mousse de résine thermoplastique et produit d'étanchéité à base de mousse Download PDF

Info

Publication number
WO2013180028A1
WO2013180028A1 PCT/JP2013/064473 JP2013064473W WO2013180028A1 WO 2013180028 A1 WO2013180028 A1 WO 2013180028A1 JP 2013064473 W JP2013064473 W JP 2013064473W WO 2013180028 A1 WO2013180028 A1 WO 2013180028A1
Authority
WO
WIPO (PCT)
Prior art keywords
resin foam
thermoplastic resin
resin
foam
thickness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2013/064473
Other languages
English (en)
Japanese (ja)
Inventor
和通 加藤
齋藤　誠
逸大 畑中
清明 児玉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
Original Assignee
Nitto Denko Corp
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
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Priority to CN201380028051.9A priority Critical patent/CN104334620A/zh
Publication of WO2013180028A1 publication Critical patent/WO2013180028A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • 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
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • 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
    • C08J9/12—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 physical blowing agent
    • C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
    • 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
    • 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
    • C08J2201/00—Foams characterised by the foaming process
    • C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
    • C08J2201/03—Extrusion of the foamable blend
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/06—CO2, N2 or noble gases
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/08—Supercritical fluid
    • 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
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/06—Flexible foams
    • 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
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/22—Thermoplastic resins
    • 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
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/26—Elastomers
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/16—Ethene-propene or ethene-propene-diene copolymers
    • 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
    • C08J2400/00—Characterised by the use of unspecified polymers
    • C08J2400/22—Thermoplastic resins
    • 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
    • C08J2400/00—Characterised by the use of unspecified polymers
    • C08J2400/26—Elastomers
    • 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
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/10—Homopolymers or copolymers of propene
    • C08J2423/12—Polypropene
    • 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
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/16—Ethene-propene or ethene-propene-diene copolymers

Definitions

  • the present invention relates to a thermoplastic resin foam and a foam sealing material.
  • resin foam has been used as a gasket material for mobile phones and portable information terminals.
  • the resin foam include a low-foam urethane resin foam of fine cells having an open-cell structure, a compression-molded high-foam urethane, and a polyethylene resin foam having closed cells and an expansion ratio of about 30 times, density A polyolefin-based resin foam (see Patent Documents 1 and 2) having a weight of 0.2 g / cm 3 or less has been proposed.
  • Such a resin foam is usually applied as a gasket material for mobile phones and portable information terminals by being processed into a predetermined shape and fixed to a predetermined part of these devices.
  • a dent may be caused by colliding with a corner of a desk, a roll core or the like, or by gripping with a fingertip, a nail, tweezers or the like.
  • Such dents in the resin foam generally recover over time.
  • the original function as the gasket material cannot be sufficiently achieved.
  • An object of the present invention is to provide a thermoplastic resin foam and a sealing material capable of realizing sufficient and rapid recovery of a dent.
  • the present inventors have made the dent recovery rate to be a predetermined value or more in the thermoplastic resin foam, or in addition to having a good thickness recovery rate.
  • the dent recovery rate By setting the dent recovery rate to a predetermined value or more, it is possible to obtain a thermoplastic resin foam that can improve the dust-proof performance effectively while being able to follow the minute clearance with flexibility. Heading The present invention has been completed.
  • the present invention includes the following inventions.
  • a thermoplastic resin foam characterized by having a dent recovery rate at 23 ° C. defined below of 50% or more. Depression recovery rate: The thermoplastic resin foam was compressed to the lowest point in the thickness direction of the foam with a jig having a blade angle of 90 degrees and maintained for 15 seconds, then the compressed state was released, and the compressed state was released 60 The ratio of the thickness of the dent after 2 seconds to the initial thickness.
  • the thermoplastic resin foam according to (1) having an average cell diameter of 10 to 200 ⁇ m and an apparent density of 0.01 to 0.20 g / cm 3 .
  • Repulsive stress at 50% compression Repulsive load when a thermoplastic resin foam is compressed to 50% of the initial thickness.
  • the thermoplastic resin foam according to any one of (1) to (3) which is obtained by decompression treatment of a thermoplastic resin composition impregnated with a high-pressure gas.
  • the thermoplastic resin foam according to (4), wherein the gas is an inert gas.
  • thermoplastic resin foam according to any one of 7).
  • Thickness recovery rate The ratio of the thickness to the initial thickness 1 second after releasing the compressed state after releasing the compressed state after compressing in the thickness direction to 20% of the initial thickness for 1 minute.
  • Strain recovery rate The ratio of the thickness to the initial thickness in the thickness direction after the compression state is released for 24 hours at a thickness of 50% with respect to the initial thickness and then the compressed state is released.
  • a foamed sealing material comprising the thermoplastic resin foam according to any one of (1) to (10) above.
  • thermoplastic resin foam capable of effectively improving dustproof performance while having flexibility and following a minute clearance.
  • FIG. 4 is a top view and a schematic cross-sectional view taken along line A-A ′ of an evaluation container for dynamic dustproof evaluation assembled with an evaluation sample. It is the schematic which shows the tumbler which set
  • thermoplastic resin foam of the present invention is a foam containing a thermoplastic resin, and is obtained by foaming and molding a thermoplastic resin composition.
  • the shape of the resin foam of this invention is not specifically limited, For example, any forms, such as a lump shape, a sheet form, and a film form, may be sufficient.
  • the resin foam of the present invention has a dent recovery rate at 23 ° C. defined below of 50% or more, preferably 52% or more, 55% or more, more preferably 60% or more, and particularly preferably 65% or more. It is.
  • the dent recovery rate is determined by compressing the thermoplastic resin foam to the lowest point in the thickness direction of the resin foam with a jig having a blade angle of 90 degrees and maintaining it for 15 seconds, then releasing the compressed state and releasing the compressed state. It is defined as the ratio of the thickness of the recessed portion after 60 seconds to the initial thickness.
  • a jig having a blade angle of 90 degrees used for evaluating the dent recovery rate has a right edge at the tip of the blade that gives a dent to the resin foam, and the length L of one side thereof is 1 to 1.
  • the thickness is about 20 mm, preferably about 5 mm, and the thickness M is about 1 to 20 cm, preferably about 5 cm.
  • the resin foam of the present invention Since the resin foam of the present invention has a dent recovery rate of 50% or more at 23 ° C., it is excellent in strain recovery. Therefore, the resin foam of the present invention can exhibit good dust resistance, in particular, good dynamic dust resistance (dustproof performance in a dynamic environment).
  • the resin foam of the present invention is assembled as a foam sealing material in the clearance of a mobile phone, a portable information terminal, etc., the resin foam is compressed by vibration and impact at the time of dropping, and the assembled clearance Even if it is deformed to a state where it is not completely closed, the dent can be recovered quickly and sufficiently, the clearance can be sufficiently closed, and the entry of foreign matter such as dust can be effectively prevented.
  • the cell structure is a closed cell structure or a semi-continuous semi-closed cell structure (a cell structure in which a closed cell structure and an open cell structure are mixed, and the ratio is not particularly limited). It is preferable that In particular, a cell structure in which the closed cell ratio of the resin foam is 50% or less, preferably 40% or less, more preferably 35% or less can be mentioned. By this range, at the time of compressive deformation when an impact is applied, air can easily escape from the resin, and sufficient shock absorption can be exhibited. Further, there is a cell structure in which the closed cell ratio of the resin foam is 10% or more, preferably 15% or more, more preferably 20% or more. With this range, the ratio of open cells can be adjusted to prevent the passage of fine particles such as dust, thereby improving the dust resistance.
  • the closed cell ratio can be measured, for example, by the method described in the examples.
  • the resin foam of the present invention further has an average cell diameter in the cell structure of 10 to 200 ⁇ m, preferably 10 to 180 ⁇ m, more preferably 10 to 150 ⁇ m, still more preferably 10 to 90 ⁇ m, and particularly preferably 20 to 80 ⁇ m. is there.
  • This average cell diameter is obtained by, for example, capturing an enlarged image of the bubble portion with a digital microscope (trade name “VH-8000”, manufactured by Keyence Corporation), and image analysis software (trade name “Win ROOF”, manufactured by Mitani Corporation). It can obtain
  • the upper limit of the average cell diameter of the foam is 200 ⁇ m or less, preferably 180 ⁇ m or less or 150 ⁇ m or less, more preferably 90 ⁇ m or less, and particularly preferably 80 ⁇ m or less, thereby improving dust resistance,
  • the light shielding property can be improved.
  • the lower limit of the average cell diameter of the foam is 10 ⁇ m or more, preferably 20 ⁇ m or more, cushioning properties (impact absorption) can be improved.
  • the resin foam of the present invention further has an apparent density of preferably 0.01 to 0.20 g / cm 3 , more preferably 0.01 to 0.15 g / cm 3 , and 0.01 to 0.10 g / cm 3 . 3 , more preferably 0.02 to 0.08 g / cm 3 .
  • apparent density preferably 0.01 to 0.20 g / cm 3 , more preferably 0.01 to 0.15 g / cm 3 , and 0.01 to 0.10 g / cm 3 . 3 , more preferably 0.02 to 0.08 g / cm 3 .
  • the resin foam of the present invention further has a repulsion stress at 50% compression at 23 ° C., defined below, of preferably 0.1 to 3.0 N / cm 2 , preferably 0.1 to 2.0 N. / Cm 2 , more preferably 0.1 to 1.7 N / cm 2 .
  • the repulsive stress at the time of 50% compression at 23 ° C. is defined as the repulsive load when the resin foam is compressed to a thickness of 50% with respect to the initial thickness at 23 ° C. as described above.
  • the resin foam of the present invention has a rebound stress at the time of 50% compression in this range, good flexibility can be exhibited. Therefore, in particular, when this resin foam is used as a foam sealing material, it is possible to exhibit followability with respect to a minute clearance. For this reason, when the resin foam of the present invention is assembled into a clearance as a foam seal material, even if the clearance is narrow, a problem due to the repulsion of the foam seal material (for example, deformation of a member or casing around the foam seal material) Occurrence of color unevenness in the image display unit, etc.) can be prevented.
  • the foam seal material for example, deformation of a member or casing around the foam seal material
  • the resin foam of the present invention has a specific dent recovery rate and a specific average cell diameter, a specific apparent density, and / or a specific repulsion stress at 50% compression at 23 ° C. As a result, it can be followed by a minute clearance, dust resistance and flexibility can be further improved, and dynamic dust resistance can be significantly improved.
  • the resin foam of the present invention further has a thickness recovery rate at 23 ° C. defined below of 50% or more (for example, 50 to 100%), preferably 65% or more (for example, 65 to 100%). More preferably, it is 70% or more (for example, 70 to 100%), and more preferably 75% or more (for example, 75 to 100%).
  • the thickness recovery rate at 23 ° C. is that when the compressed state is released after the resin foam is compressed at 23 ° C. to a thickness of 20% of the initial thickness for 1 minute. It is defined as the ratio of the thickness after 1 second to the initial thickness.
  • the resin foam of the present invention has a thickness recovery rate of 50% or more, the strain recovery property is quick, and thereby good dust resistance, particularly good dynamic dust resistance (dust protection under dynamic environment). Performance).
  • this resin foam is assembled in a clearance, for example, as a foam seal material, when the foam seal material is deformed by vibration and impact at the time of dropping, that is, the foam seal material is compressed and below the assembled clearance.
  • the film is deformed to a thickness of 5 mm, the thickness is recovered very quickly and the clearance can be filled. Thereby, the entrance of foreign matter such as dust can be prevented.
  • Resin foam of the present invention further, repulsion stress at 50% compression at -10 ° C. is preferably less than 10.0 N / cm 2, more preferably, 9N / cm 2 or less, 8N / cm 2 or less further preferably is 7N / cm 2 or less or 5N / cm 2 or less.
  • the repulsive stress at 50% compression here is defined as the same repulsive load except that the repulsive stress at 50% compression is different from that at 50 ° C. as described above.
  • the resin foam of the present invention further has a repulsion stress at 80% compression at 23 ° C. of preferably 1.0 to 9.0 N / cm 2 , more preferably 1.0 to 8 N / cm 2 , and even more preferably. Is 1.0 to 7.5 N / cm 2 .
  • the repulsive stress at the time of 80% compression here is defined as the repulsive load when the resin foam is compressed to 80% of the initial thickness at 23 ° C. as described above.
  • the resin foam of the present invention further preferably has a strain recovery rate at 23 ° C. of 75% or more, more preferably 80% or more, and still more preferably 85% or more.
  • the strain recovery rate is the ratio of the thickness 24 hours after the release of the compressed state to the initial thickness when the compressed state is released after being compressed to 50% of the initial thickness in the thickness direction for 24 hours. Is defined as
  • the resin foam of the present invention has a strain recovery rate of 75% or more, even if a load is maintained for a long time, it is excellent in recovering the subsequent strain, good dust resistance, particularly good dynamic Dustproofness (dustproofness in a dynamic environment) can be demonstrated.
  • the resin foam of the present invention has a dent recovery rate at 23 ° C., rebound stress at 50% compression at ⁇ 10 ° C., thickness recovery rate at 23 ° C., and 80% compression at 23 ° C.
  • the rebound stress and the strain recovery rate at 23 ° C. are satisfactory, it is sufficient in any temperature range with respect to the deformation of the resin foam that is normally considered.
  • the shape can be quickly recovered, and the dustproof performance under the dynamic environment intended in the present invention can be maximized.
  • sufficient light shielding properties or light leakage can be prevented.
  • the resin foam of the present invention is formed by a thermoplastic resin or a resin composition containing a thermoplastic resin.
  • the thermoplastic resin include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, a copolymer of ethylene and propylene, ethylene or propylene and another ⁇ -olefin (for example, butene -1, pentene-1, hexene-1, 4-methylpentene-1, etc.), ethylene and other ethylenically unsaturated monomers (for example, vinyl acetate, acrylic acid, acrylic ester, methacrylic) Polyolefin resins such as copolymers with acid, methacrylic acid ester, vinyl alcohol, etc.); styrene resins such as polystyrene, acrylonitrile-butadiene-styrene copolymer (ABS resin); 6-nylon, 66-nylon, 12 -Polyamide
  • thermoplastic resin a polyolefin-based resin is preferable from the viewpoints of characteristics such as mechanical strength, heat resistance, and chemical resistance, and molding surfaces such as easy melt thermoforming.
  • Preferred examples of the polyolefin resin include a resin having a broad molecular weight distribution and having a shoulder on the high molecular weight side, a micro-crosslinking type resin (a slightly cross-linked type resin), a long-chain branched type resin, and the like.
  • melt tension (temperature: 210 ° C., tensile speed: 2.0 m / min, capillary: ⁇ 1 mm ⁇ 10 mm from the viewpoint of obtaining a resin foam having a high foaming ratio and a uniform cell structure. ) Is preferably 3 to 50 cN (preferably 8 to 50 cN).
  • the thermoplastic resin includes a rubber component and / or a thermoplastic elastomer component. Since the rubber component and the thermoplastic elastomer component have, for example, a glass transition temperature of room temperature or lower (for example, 20 ° C. or lower), flexibility and shape followability when a resin foam is obtained are extremely good.
  • the rubber component and the thermoplastic elastomer component are not particularly limited as long as they have rubber elasticity and can be foamed.
  • natural or natural rubber polyisobutylene, polyisoprene, chloroprene rubber, butyl rubber, nitrile butyl rubber, or the like Synthetic rubbers; Ethylene-propylene copolymers, ethylene-propylene-diene copolymers, ethylene-vinyl acetate copolymers, polybutenes, olefinic elastomers such as chlorinated polyethylene; styrene-butadiene-styrene copolymers, styrene-isoprene -Styrene elastomers such as styrene copolymers and hydrogenated products thereof; polyester elastomers; polyamide elastomers; various thermoplastic elastomers such as polyurethane elastomers. You may use these individually or in combination
  • an olefin elastomer is preferable as the rubber component and / or the thermoplastic elastomer component.
  • the olefin elastomer has good compatibility with the polyolefin resin exemplified as the thermoplastic resin.
  • the olefin-based elastomer may be a type having a structure in which the resin component A (olefin-based resin component A) and the rubber component B are microphase-separated, or the resin component A and the rubber component B are physically dispersed.
  • the resin component A and the rubber component B may be dynamically heat treated in the presence of a cross-linking agent (dynamic cross-linkable thermoplastic elastomer, TPV).
  • TPV dynamic cross-linkable thermoplastic elastomer
  • TPV dynamically crosslinked thermoplastic olefin elastomer
  • Dynamically-crosslinked thermoplastic olefin elastomer has higher elastic modulus and smaller compression set than TPO (non-crosslinked thermoplastic olefin elastomer). Thereby, the recoverability is good, and when the resin foam is used, the excellent recoverability is exhibited.
  • the dynamically crosslinked thermoplastic olefin elastomer is a mixture containing the resin component A (olefin resin component A) forming a matrix and the rubber component B forming a domain, in the presence of a crosslinking agent. It is a multiphase polymer having a sea-island structure in which crosslinked rubber particles are finely dispersed as domains (island phases) in the resin component A, which is a matrix (sea phase), obtained by dynamic heat treatment.
  • thermoplastic olefin elastomer examples include, for example, JP 2000-007858 A, JP 2006-052277 A, JP 2012-072306 A, JP 2012-056768 A, JP-A-2010-241897, JP-A-2009-0697969, RE-list 03/002654, etc., “Zeotherm” (manufactured by Zeon Corporation), “Thermorun” (manufactured by Mitsubishi Chemical Corporation), “Surlink” 3245D "(manufactured by Toyobo Co., Ltd.) and the like.
  • the content is not particularly limited.
  • the ratio of the thermoplastic resin to the rubber component and / or the thermoplastic elastomer component in the resin constituting the resin foam of the present invention is preferably 70/30 to 30/70, more preferably on a weight basis. Is 60/40 to 30/70, even more preferably 50/50 to 30/70, even more preferably 60/40 to 10/90, 58/42 to 10/90, 55/45 to 10/90.
  • the ratio of the rubber component and / or the thermoplastic elastomer component is too small, the cushioning property of the resin foam tends to be lowered or the recoverability after compression may be lowered.
  • the rubber component and / or the thermoplastic elastomer component If the ratio is too large, outgassing tends to occur during foam formation, and it may be difficult to obtain a highly foamable foam.
  • the resin foam of the present invention is excellent in so-called rubber elasticity in order to realize flexibility at high compression and shape recovery after compression, that is, to enable large deformation and prevent plastic deformation. Suitable materials are suitable. From this viewpoint, the resin foam of the present invention preferably contains a rubber component and / or a thermoplastic elastomer component together with the above-described thermoplastic resin as the constituent resin composition.
  • the resin foam of the present invention preferably further contains a nucleating agent in the constituent resin composition.
  • a nucleating agent in the constituent resin composition.
  • nucleating agent examples include oxides and composite oxides such as talc, silica, alumina, zeolite, calcium carbonate, magnesium carbonate, barium sulfate, zinc oxide, titanium oxide, aluminum hydroxide, magnesium hydroxide, mica, and montmorillonite.
  • a nucleating agent is used individually or in combination of 2 or more types.
  • the average particle size of the nucleating agent is not particularly limited, but is preferably 0.3 to 1.5 ⁇ m, more preferably 0.4 to 1.2 ⁇ m. By setting it as such an average particle diameter, sufficient function as a nucleating agent can be exhibited. In addition, a high expansion ratio can be realized without the nucleating agent breaking through the cell walls.
  • This average particle diameter can be measured by a laser diffraction particle size distribution measuring method. For example, the measurement can be performed from the sample dispersion dilution (AUTO measurement mode) using “MICROTRAC MT-3000” manufactured by LEEDS & NORTHRUP INSTRUMENTS.
  • the content when a nucleating agent is included is not particularly limited, but is preferably 0.5 to 150 parts by weight, more preferably 2 to 140 parts by weight with respect to 100 parts by weight of the constituent resin. Part by weight, still more preferably 3 to 130 parts by weight.
  • the resin foam of this invention is comprised with a thermoplastic resin and is easy to burn, it is preferable to contain a flame retardant.
  • a flame retardant a non-halogen-nonantimony inorganic flame retardant is preferable.
  • inorganic flame retardants include metal hydroxides and hydrates of metal compounds. More specifically, aluminum hydroxide; magnesium hydroxide; hydrates of magnesium oxide and nickel oxide; hydrates of magnesium oxide and zinc oxide, and the like. Among these, magnesium hydroxide is preferable.
  • the hydrated metal compound may be surface-treated.
  • a flame retardant is used individually or in combination of 2 or more types.
  • the content is preferably 5 to 70 parts by weight, more preferably 25 to 65 parts by weight with respect to 100 parts by weight of the constituent resin.
  • the resin foam of the present invention further has a polar functional group, a melting point of 50 to 150 ° C., and contains at least one aliphatic compound selected from fatty acids, fatty acid amides, and fatty acid metal soaps. Also good. Of these, fatty acids and fatty acid amides are preferred.
  • Such an aliphatic compound When such an aliphatic compound is contained in the resin foam of the present invention, the cell structure is less likely to collapse during processing (particularly punching processing), shape recovery is improved, and workability (particularly, (Punching workability) is further improved.
  • Such an aliphatic compound has high crystallinity, and when added to the thermoplastic resin (especially polyolefin resin), a strong film is formed on the resin surface, and the wall surfaces of the bubbles forming the cell structure block each other. This is presumed to have a function to prevent the above.
  • Such aliphatic compounds particularly those containing a highly polar functional group, are difficult to be compatible with polyolefin resins, so that they easily precipitate on the surface of the resin foam and exhibit the above effects.
  • Cheap is difficult to be compatible with polyolefin resins, so that they easily precipitate on the surface of the resin foam and exhibit the above effects.
  • the melting point of the aliphatic compound is preferably 50 to 50 from the viewpoints of lowering the molding temperature when foam-molding the resin composition, suppressing deterioration of the resin (particularly polyolefin resin), imparting sublimation resistance, and the like. 150 ° C., more preferably 70 to 100 ° C.
  • the fatty acid preferably has about 18 to 38 carbon atoms, more preferably about 18 to 22 carbon atoms.
  • stearic acid, behenic acid, 12-hydroxystearic acid and the like can be mentioned. Of these, behenic acid is particularly preferable.
  • the fatty acid amide is preferably a fatty acid moiety having about 18 to 38 carbon atoms, more preferably 18 to 22 carbon atoms.
  • either monoamide or bisamide may be used.
  • Specific examples include stearic acid amide, oleic acid amide, erucic acid amide, methylene bis stearic acid amide, and ethylene bis stearic acid amide. Of these, erucic acid amide is particularly preferable.
  • fatty acid metal soap examples include aluminum, calcium, magnesium, lithium, barium, zinc and lead salts of the above fatty acids.
  • the content when such an aliphatic compound is included is not particularly limited, but is preferably 1 to 5 parts by weight, more preferably 100 parts by weight of the resin constituting the resin foam. 1.5 to 3.5 parts by weight, still more preferably 2 to 3 parts by weight.
  • a foaming agent for example, an inert gas such as carbon dioxide and nitrogen
  • the resin foam of the present invention may contain a lubricant. Thereby, while improving the fluidity
  • a lubricant is used individually or in combination of 2 or more types.
  • the lubricant is not particularly limited.
  • hydrocarbon lubricants such as liquid paraffin, paraffin wax, microwax and polyethylene wax; butyl stearate, monoglyceride stearate, pentaerythritol tetrastearate, hydrogenated castor oil, stearyl stearate And ester lubricants.
  • content of a lubricant can be suitably selected in the range which does not impair the effect of this invention.
  • the resin foam of the present invention may contain other additives as necessary.
  • additives include anti-shrinkage agents, anti-aging agents, heat stabilizers, light stabilizers such as HALS, weathering agents, metal deactivators, ultraviolet absorbers, light stabilizers, copper damage inhibitors, and the like.
  • Stabilizers antibacterial agents, fungicides, dispersants, tackifiers, colorants such as carbon black and organic pigments, fillers, and the like.
  • a composition containing an additive for example, a colorant such as carbon black, a softening agent, etc.
  • additives are used alone or in combination of two or more. The content of these additives can be appropriately selected within a range that does not impair the effects of the present invention.
  • the resin foam of the present invention is obtained by mixing and kneading a thermoplastic resin (including a rubber component and / or a thermoplastic elastomer component) and optionally an additive such as a nucleating agent, an aliphatic compound, or a lubricant. It can manufacture by foaming and shape
  • the foaming method used when foaming and molding the resin composition is not particularly limited, and examples thereof include usually used methods such as a physical method and a chemical method.
  • a general physical method is a method of forming bubbles by dispersing a low boiling point liquid (foaming agent) such as chlorofluorocarbons or hydrocarbons in a resin, and then heating to volatilize the foaming agent.
  • a general chemical method is a method in which bubbles are formed by a gas generated by thermal decomposition of a compound (foaming agent) added to a resin.
  • a method using a high-pressure gas as a foaming agent is preferable because a foam having a small cell diameter and a high cell density can be easily obtained.
  • a method using a high-pressure inert gas as a foaming agent is preferable.
  • a method of using a high-pressure gas as a foaming agent a method in which a resin composition is impregnated with a high-pressure gas and then subjected to a pressure reduction process is preferable.
  • the inert gas is not particularly limited as long as it is inert and can be impregnated into the resin that is the material of the resin foam, and examples thereof include carbon dioxide, nitrogen, and air. These gases may be mixed and used. Of these, carbon dioxide or nitrogen is preferred, and carbon dioxide is more preferred because the amount of impregnation into the resin is large and the impregnation speed is fast.
  • the high-pressure gas (particularly inert gas, and further carbon dioxide) is preferably a gas in a supercritical state.
  • the solubility of the gas in the resin is increased and high concentration can be mixed.
  • the generation of bubble nuclei increases, and the density of bubbles formed by the growth of the bubble nuclei has a porosity. Even if they are the same, they become larger, so that fine bubbles can be obtained.
  • carbon dioxide has a critical temperature of 31 ° C. and a critical pressure of 7.4 MPa.
  • an unfoamed resin molded product (unfoamed resin molded product) is obtained by molding a resin composition into an appropriate shape such as a sheet shape in advance. After that, the unfoamed resin molded body is impregnated with a high-pressure gas and foamed by releasing the pressure, and the resin composition is kneaded with the high-pressure gas under pressure, and simultaneously molded and pressurized. Any of the continuous methods of releasing and simultaneously performing molding and foaming may be used.
  • the resin composition is an extruder such as a single screw extruder or a twin screw extruder. Molding method using a kneading machine equipped with blades such as rollers, cams, kneaders, Banbury molds, etc., and then kneading the resin composition to a predetermined thickness using a hot plate press or the like And a method of molding the resin composition using an injection molding machine.
  • the unfoamed resin molded body can be formed by other molding methods besides extrusion molding, press molding, and injection molding.
  • the shape of the unfoamed resin molded body is not particularly limited, and various shapes can be selected depending on the application, and examples thereof include a sheet shape, a roll shape, a plate shape, and a lump shape.
  • the resin composition can be molded by an appropriate method that can obtain an unfoamed resin molded body having a desired shape and thickness.
  • the obtained unfoamed resin molded product is placed in a pressure vessel (high pressure vessel) and injected with high pressure gas (especially inert gas or even carbon dioxide) ( Gas) impregnating a non-foamed resin molded body with a high-pressure gas, releasing the pressure when the sufficiently high-pressure gas is impregnated (usually up to atmospheric pressure), and creating bubble nuclei in the resin Bubbles are formed in the resin through a decompression step to be generated, and in some cases (if necessary), a heating step in which bubble nuclei are grown by heating. Bubble nuclei may be grown at room temperature without providing a heating step.
  • high pressure gas especially inert gas or even carbon dioxide
  • the resin composition is kneaded using an extruder such as a single screw extruder or a twin screw extruder while a high pressure gas (especially an inert gas, Is injected (introduced) carbon dioxide), and the pressure is released by extruding the resin composition through a kneading impregnation step for impregnating the resin composition with a sufficiently high pressure gas, a die provided at the tip of the extruder ( Usually, up to atmospheric pressure), foaming or molding may be performed by a molding decompression step in which molding and foaming are performed simultaneously.
  • an extruder such as a single screw extruder or a twin screw extruder while a high pressure gas (especially an inert gas, Is injected (introduced) carbon dioxide), and the pressure is released by extruding the resin composition through a kneading impregnation step for impregnating the resin composition with a sufficiently high pressure gas, a die provided at the tip of the ex
  • an injection molding machine or the like may be used in addition to the extruder.
  • a heating step for growing bubbles by heating may be provided as necessary.
  • the shape may be fixed rapidly by cooling with cold water or the like.
  • the high-pressure gas may be introduced continuously or discontinuously.
  • known methods such as a water bath, an oil bath, a hot roll, a hot air oven, a far infrared ray, a near infrared ray, and a microwave can be employed.
  • the stretching is preferably performed so that the ratio of the resin extrusion speed and the molding speed is 1: 1.2 to 5.
  • the ratio of the resin extrusion speed and the molding speed is 1: 1.2 to 5.
  • the molding speed means a speed at which the resin sheet is fed by a roll or a belt.
  • the molding speed is not particularly limited, and is preferably 2 to 100 m / min, for example. Thereby, a resin sheet can be shape
  • the nip pressure is preferably set so that the foam is not crushed in the thickness direction.
  • the mixing amount of the gas at the time of foaming or molding the resin composition is not particularly limited. For example, it is preferably 2 to 10% by weight, more preferably 2.5 to 2.5%, based on the total amount of the resin components in the resin composition. 8% by weight, still more preferably 3-6% by weight. By setting it as this range, a foam with a high foaming rate can be obtained, without gas separating in a molding machine.
  • the pressure when impregnating the unfoamed resin molded product or the resin composition with the gas in the gas impregnation step in the batch method or the kneading impregnation step in the continuous method when foaming and molding the resin composition can be appropriately selected in consideration of the type of gas and operability.
  • the pressure is preferably 6 MPa or more (for example, 6 to 100 MPa), more preferably 8 MPa or more (for example, 8 to 100 MPa).
  • the temperature when impregnating the non-foamed resin molded product or resin composition with the high-pressure gas is the gas or resin used. It depends on the type. This temperature can be selected within a wide range, and is preferably 10 to 350 ° C. in consideration of operability and the like.
  • the impregnation temperature when impregnating a sheet-like unfoamed resin molded body with a high-pressure gas is preferably 10 to 250 ° C., more preferably 40 to 240 ° C., and even more preferably 60 to 230 ° C.
  • the temperature at which high-pressure gas is injected into the resin composition and kneaded is preferably 60 to 350 ° C., more preferably 100 to 320 ° C., and even more preferably 150 to 300 ° C.
  • the temperature during impregnation is preferably 32 ° C. or higher (particularly 40 ° C. or higher) in order to maintain a supercritical state.
  • the pressure reduction rate in the pressure reduction step when foaming and molding the resin composition in a batch method or a continuous method is not particularly limited, but is preferably 5 to 300 MPa / second in order to obtain uniform fine bubbles.
  • the heating temperature in the heating step is, for example, 40 to 250 ° C. (preferably 60 to 250 ° C.).
  • a highly foamed resin foam can be produced, and a thick resin foam can be produced.
  • the gap between the dies attached to the tip of the extruder is as narrow as possible (usually 0.1 to 1 in order to maintain the pressure inside the extruder in the kneading impregnation step. About 0 mm). Therefore, in order to obtain a thick resin foam, it is preferable to foam the resin composition extruded through a narrow gap at a high magnification.
  • the thickness of the formed resin foam is limited to a thin one (for example, 0.5 to 2.0 mm).
  • a resin foam having a thickness of 0.50 to 5.00 mm can be continuously obtained by foaming or molding a resin composition using a high-pressure gas. It is.
  • the resin foam of the present invention has a dent recovery rate, a thickness recovery rate, a strain recovery rate, an average cell diameter, a repulsion stress during compression, an apparent density, a relative density, and the like, a gas, a thermoplastic resin, a rubber component, and / or a heat.
  • operating conditions such as temperature, pressure and time in the gas impregnation process and kneading impregnation process
  • operating conditions such as the decompression speed, temperature and pressure in the decompression process and molding decompression process, after decompression Or it can also adjust by selecting and setting suitably the heating temperature etc. in the heating process after shaping
  • the resin foam of the present invention is decompressed after impregnating a resin composition containing at least a nucleating agent and an aliphatic compound in addition to a thermoplastic resin with a high-pressure gas (particularly an inert gas). It is preferably formed through a process.
  • a resin composition containing at least a nucleating agent and an aliphatic compound in addition to a thermoplastic resin with a high-pressure gas (particularly an inert gas). It is preferably formed through a process.
  • a high-pressure gas particularly an inert gas
  • the resin foam of the present invention is obtained by impregnating a supercritical inert gas with a resin composition containing at least a nucleating agent having a particularly small average particle diameter and an aliphatic compound in addition to a thermoplastic resin. More preferably, it is formed through a pressure reducing step.
  • the average cell diameter is extremely small, the cell structure ratio is low, the cell structure is high, the foaming ratio is high, the flexibility is good, the cell structure is difficult to deform or compress, and the strain when pressed It has excellent recoverability and can further suppress the nucleating agent from breaking through the bubble wall. Therefore, the resin foam which is more excellent in workability can be obtained easily.
  • the resin foam of the present invention is a mixture of a thermoplastic resin and a rubber component and / or a thermoplastic elastomer component, the ratio of which is 70/30 to 30/70 on a weight basis,
  • the foam sealing material of this invention is a member containing the said resin foam.
  • the shape of the foam sealing material is not particularly limited, and a sheet shape (including a film shape) is preferable.
  • the foamed sealing material may be configured only by a resin foam, or may be configured such that an adhesive layer, a base material layer, and the like are laminated on the resin foam.
  • the foamed sealing material of the present invention preferably has an adhesive layer.
  • the foamed sealing material of the present invention when it is a sheet-like foamed sealing material, it may have an adhesive layer on one or both sides.
  • a processing mount can be provided on the foamed sealing material via the adhesive material layer, and further, fixed to the adherend, temporarily fixed, etc. it can.
  • the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is not particularly limited.
  • an acrylic pressure-sensitive adhesive such as a rubber-based pressure-sensitive adhesive (such as a natural rubber-based pressure-sensitive adhesive, a synthetic rubber-based pressure-sensitive adhesive), a silicone-based pressure-sensitive adhesive, or a polyester-based pressure-sensitive adhesive.
  • Known pressure-sensitive adhesives such as adhesives, urethane-based pressure-sensitive adhesives, polyamide-based pressure-sensitive adhesives, epoxy-based pressure-sensitive adhesives, vinyl alkyl ether-based pressure-sensitive adhesives, and fluorine-based pressure-sensitive adhesives can be appropriately selected and used.
  • An adhesive can be used individually or in combination of 2 or more types.
  • the pressure-sensitive adhesive may be any type of pressure-sensitive adhesive such as an emulsion-based pressure-sensitive adhesive, a solvent-based pressure-sensitive adhesive, a hot-melt pressure-sensitive adhesive, an oligomer-based pressure-sensitive adhesive, and a solid-type pressure-sensitive adhesive.
  • an acrylic pressure-sensitive adhesive is preferable from the viewpoint of preventing contamination of the adherend.
  • the thickness of the adhesive material layer is preferably 2 to 100 ⁇ m, more preferably 10 to 100 ⁇ m.
  • the pressure-sensitive adhesive layer may have any form of a single layer or a laminate, and may be foamable or non-foamable. Of these, a non-foaming pressure-sensitive adhesive layer is preferable.
  • the pressure-sensitive adhesive layer may be provided via another layer (lower layer).
  • a lower layer include other pressure-sensitive adhesive layers, intermediate layers, undercoat layers, base material layers (particularly film layers, nonwoven fabric layers, etc.) and the like.
  • the lower layer may be a foamable layer or a porous layer, but is preferably a non-foamable layer, more preferably a resin layer.
  • the pressure-sensitive adhesive layer may be protected by a release film (separator) (for example, release paper, release film, etc.).
  • the foamed sealing material of the present invention contains the resin foam of the present invention, it has good dust resistance, particularly good dynamic dust resistance, and has flexibility to follow a minute clearance.
  • the foamed sealing material of the present invention may be processed so as to have a desired shape and thickness.
  • various shapes may be processed according to the device, equipment, casing, member, and the like used.
  • the foamed sealing material of the present invention is suitably used as a member used when various members or parts are attached (attached) to a predetermined site.
  • the foamed sealing material of the present invention is suitable as a member used when attaching (attaching) a component constituting an electric or electronic device to a predetermined site in an electric or electronic device.
  • the various members or parts that can be attached (mounted) using the foamed member are not particularly limited, and examples thereof include various members or parts in electrical or electronic equipment.
  • Examples of such a member or component for electric or electronic equipment include an image display member (display unit) (particularly a small image display member) mounted on an image display device such as a liquid crystal display, an electroluminescence display, or a plasma display. ), Optical members or optical components such as cameras and lenses (particularly small cameras and lenses) mounted on mobile communication devices such as so-called “mobile phones” and “portable information terminals”.
  • the foamed sealing material of the present invention is preferably used around the display unit such as an LCD (liquid crystal display) and the display unit such as an LCD (liquid crystal display) and a housing for the purpose of dust prevention, light shielding, buffering, and the like. What is inserted and used between a body (window part) is mentioned.
  • the foamed sealing material of the present invention is attached to such a member or part, it is preferably attached so as to close the clearance.
  • the clearance is not particularly limited, and may be about 0.05 to 0.5 mm, for example.
  • the thermoplastic resin foam and foamed sealing material of the present invention will be described based on examples.
  • Example 1 As a resin composition, 35 parts by weight of polypropylene, 60 parts by weight of a thermoplastic elastomer composition, 5 parts by weight of lubricant, Ten parts by weight of the nucleating agent and 2 parts by weight of erucic acid amide (melting point: 80 to 85 ° C.) were kneaded at a temperature of 200 ° C. with a twin-screw kneader.
  • Polypropylene is a resin having a melt flow rate (MFR) of 0.35 g / 10 min
  • MFR melt flow rate
  • the thermoplastic elastomer composition contains 15.0% by weight of carbon black and is a blend of polypropylene (PP) and ethylene / propylene / 5-ethylidene-2-norbornene terpolymer (EPT) (crosslinked olefin type).
  • Thermoplastic elastomer, TPV), polypropylene: ethylene / propylene / 5-ethylidene-2-norbornene terpolymer 25: 75 (weight basis),
  • the lubricant is a master batch in which 1 part by weight of stearic acid monoglyceride is blended with 10 parts by weight of polyethylene,
  • the nucleating agent is magnesium hydroxide having an average particle size of 0.8 ⁇ m.
  • the resin composition was extruded into strands, cooled with water, cut into pellets, and molded.
  • This pellet was put into a tandem type single screw extruder manufactured by Nippon Steel Works Co., Ltd., and 3.8% by weight of carbon dioxide gas was injected under an atmosphere of 220 ° C. under a pressure of 14 (18 after injection) MPa. Carbon dioxide gas was sufficiently saturated and cooled to a temperature suitable for foaming. Thereafter, the resin was extruded from a die, and the ratio of the resin extrusion speed to the molding speed was adjusted to be in the range of 1: 1.2 to 2 to obtain a resin foam (sheet-like). This resin foam had a semi-continuous semi-closed cell structure with a closed cell rate of 32%.
  • Example 2 A resin foam (sheet-like) was obtained in the same manner as in Example 1 except that 3.7% by weight of carbon dioxide gas was injected into a tandem single screw extruder manufactured by Nippon Steel Works.
  • Example 3 A resin foam (sheet-like) was obtained in the same manner as in Example 1 except that 3.5% by weight of carbon dioxide gas was injected into a tandem single screw extruder manufactured by Nippon Steel Works.
  • TPO polypropylene
  • EPT ethylene / propylene / 5-ethylidene-2-norbornene terpolymer
  • the resin composition was extruded into a strand shape, cooled with water, cut into a pellet shape, and molded.
  • This pellet was put into a tandem type single screw extruder manufactured by Nippon Steel Works Co., Ltd., and 3.8% by weight of carbon dioxide gas was injected under an atmosphere of 220 ° C. under a pressure of 14 (18 after injection) MPa. Carbon dioxide gas was sufficiently saturated and cooled to a temperature suitable for foaming. Then, it extruded from the die
  • This resin foam had a semi-continuous semi-closed cell structure with a closed cell ratio of 46%.
  • Comparative Example 2 A resin foam (sheet-like) was obtained in the same manner as in Comparative Example 1 except that 3.7% by weight of carbon dioxide gas was injected into a tandem single screw extruder manufactured by Nippon Steel Works.
  • the closed cell ratio of the resin foams obtained in Examples and Comparative Examples was measured according to the following method. From the obtained resin foam, a flat square test piece having a constant thickness and a side of 5 cm is cut out. Subsequently, the weight W 1 (g) and thickness (cm) of the test piece are measured, and the apparent volume V 1 (cm 3 ) of the test piece is calculated. Next, the obtained value is substituted into the equation (1), and the apparent volume V 2 (cm 3 ) occupied by the bubbles is calculated. The density of the resin constituting the test piece is ⁇ g / cm 3 .
  • a smooth cross section was created by cutting the resin foam in a direction perpendicular to the main surface of the resin foam (thickness direction) in parallel with the direction perpendicular to the MD direction (flow direction) of the resin foam. These cross-sections are taken with a digital microscope (trade name “VHX-500”, manufactured by Keyence Corporation), and an enlarged image of the foam of the resin foam is captured. Analysis software for the measuring instrument (Mitani Corporation, Win ROOF) The average cell diameter ( ⁇ m) was determined by image analysis using The number of bubbles in the captured enlarged image is about 200, and the average of these 200 was used.
  • the resin foam was compressed at 23 ° C. to a thickness of 50% of the initial thickness for 24 hours, and after releasing the compressed state, the ratio was set to the initial thickness in the thickness direction for 24 hours.
  • the resin foam was punched into a frame shape (window frame shape) (40 mm ⁇ 56 mm, width: 2 mm) shown in FIG.
  • This evaluation sample 22 was attached to the dynamic dustproof evaluation container 2 shown in FIG.
  • the compression rate of the evaluation sample 22 at the time of mounting was 50% in the thickness direction with respect to the initial thickness.
  • the evaluation sample 22 is fixed to the base plate 24 with a black acrylic plate 211 attached to the base plate 24 via a foam compression plate 27 by screws 26, and fixed on the aluminum spacer 23. It is provided between the black acrylic board 212 arrange
  • the compression rate of the evaluation sample 22 can be adjusted by adjusting the thickness of the aluminum spacer 23.
  • the evaluation container 2 to which the evaluation sample 22 is attached has a system in which a certain internal space 29 is closed by the evaluation sample 22.
  • the evaluation container 2 is configured as a powder supply unit that is positioned adjacent to the outside of the evaluation sample 22 and in which a constant external space 25 is closed between the evaluation sample 22 and the foam compression plate 27.
  • the external space 25 is filled with 0.1 g of powdered dust (for example, a starch having a particle diameter of 17 ⁇ m).
  • powdered dust for example, a starch having a particle diameter of 17 ⁇ m.
  • the package was disassembled.
  • grains which passed the sample 22 for evaluation from the external space 25 which is a powder supply part, and were made to function as the upper and lower walls of internal space were attached to the digital microscope (device) Name “VHX-600” (manufactured by Keyence Corporation). Still images are created for the black acrylic plate 211 and the black acrylic plate 212, and binarization processing is performed using image analysis software (software name “Win ROOF”, manufactured by Mitani Corp.), and the number of particles of the starch is counted. did. The observation was performed in a clean bench to reduce the influence of airborne dust.
  • the present invention is useful as an internal insulator for electronic devices, cushioning materials, sound insulating materials, dustproof materials, shock absorbing materials, light shielding materials, heat insulating materials, food packaging materials, clothing materials, building materials, etc., cushioning properties and strain recovery Resin foam and foam sealing material with excellent foaming ratio and high foaming ratio, especially around the display part of mobile phones, portable information terminals, LCDs, etc. ) Can be widely used for various members.

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)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Sealing Material Composition (AREA)

Abstract

La présente invention a pour but de proposer une mousse de résine thermoplastique et un produit d'étanchéité à base de mousse qui permet à des indentations d'être restaurées de façon suffisante et rapide. La mousse de résine thermoplastique est caractérisée en ce que le taux de récupération d'indentation défini ci-dessous est d'au moins 50 %, et le produit d'étanchéité à base de mousse est caractérisé en ce qu'il contient la mousse de résine thermoplastique (en particulier, on préfère qu'une couche adhésive positionnée sur un côté ou sur les deux côtés de la mousse de résine thermoplastique soit fournie). Taux de récupération d'indentation : après compression de la mousse de résine thermoplastique à 23 °C avec un gabarit ayant un angle de lame de 90 degrés au point le plus bas dans la direction de l'épaisseur de la mousse pendant 15 secondes, puis relâchement de l'état comprimé, le taux de récupération d'indentation est le rapport de l'épaisseur de la partie indentée par rapport à l'épaisseur initiale 60 secondes après que l'état comprimé ait été relâché.
PCT/JP2013/064473 2012-05-28 2013-05-24 Mousse de résine thermoplastique et produit d'étanchéité à base de mousse Ceased WO2013180028A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201380028051.9A CN104334620A (zh) 2012-05-28 2013-05-24 热塑性树脂发泡体和发泡密封材料

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2012120825 2012-05-28
JP2012-120825 2012-05-28
JP2013-109518 2013-05-24
JP2013109518A JP6110213B2 (ja) 2012-05-28 2013-05-24 熱可塑性樹脂発泡体、発泡シール材及び熱可塑性樹脂発泡体の製造方法

Publications (1)

Publication Number Publication Date
WO2013180028A1 true WO2013180028A1 (fr) 2013-12-05

Family

ID=49673224

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2013/064473 Ceased WO2013180028A1 (fr) 2012-05-28 2013-05-24 Mousse de résine thermoplastique et produit d'étanchéité à base de mousse

Country Status (3)

Country Link
JP (1) JP6110213B2 (fr)
CN (1) CN104334620A (fr)
WO (1) WO2013180028A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014098255A1 (fr) * 2012-12-21 2014-06-26 日東電工株式会社 Mousse de résine et matériau d'étanchéité en mousse

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6039505B2 (ja) * 2012-05-31 2016-12-07 日東電工株式会社 熱可塑性樹脂発泡体及びその製造方法並びに発泡シール材
JP6785066B2 (ja) * 2016-05-30 2020-11-18 積水化成品工業株式会社 ポリオレフィン系樹脂発泡シート
JP7288994B2 (ja) * 2021-03-31 2023-06-08 日東電工株式会社 樹脂発泡体
WO2022209767A1 (fr) * 2021-03-31 2022-10-06 日東電工株式会社 Corps en mousse de résine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05295150A (ja) * 1992-01-29 1993-11-09 Japan Synthetic Rubber Co Ltd アクリル系フォーム
JPH1135784A (ja) * 1997-07-18 1999-02-09 Mitsubishi Rayon Co Ltd プラスチゾル
JP2005097566A (ja) * 2003-08-22 2005-04-14 Nitto Denko Corp 発泡防塵材、および該発泡防塵材が用いられた防塵構造
WO2006080491A1 (fr) * 2005-01-31 2006-08-03 Jsr Corporation Procede de formation d’une mousse moulee et mousse moulee
WO2012081396A1 (fr) * 2010-12-14 2012-06-21 日東電工株式会社 Mousse de résine et matériau d'étanchéité moussé

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05295150A (ja) * 1992-01-29 1993-11-09 Japan Synthetic Rubber Co Ltd アクリル系フォーム
JPH1135784A (ja) * 1997-07-18 1999-02-09 Mitsubishi Rayon Co Ltd プラスチゾル
JP2005097566A (ja) * 2003-08-22 2005-04-14 Nitto Denko Corp 発泡防塵材、および該発泡防塵材が用いられた防塵構造
WO2006080491A1 (fr) * 2005-01-31 2006-08-03 Jsr Corporation Procede de formation d’une mousse moulee et mousse moulee
WO2012081396A1 (fr) * 2010-12-14 2012-06-21 日東電工株式会社 Mousse de résine et matériau d'étanchéité moussé

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014098255A1 (fr) * 2012-12-21 2014-06-26 日東電工株式会社 Mousse de résine et matériau d'étanchéité en mousse

Also Published As

Publication number Publication date
CN104334620A (zh) 2015-02-04
JP6110213B2 (ja) 2017-04-05
JP2014005450A (ja) 2014-01-16

Similar Documents

Publication Publication Date Title
JP5856448B2 (ja) 樹脂発泡体及び発泡シール材
TWI598275B (zh) 樹脂發泡體及發泡密封材
KR102130182B1 (ko) 수지 발포체 및 발포재
KR102121184B1 (ko) 수지 발포체 시트 및 수지 발포 복합체
CN102898725B (zh) 聚烯烃树脂发泡体用树脂组合物、聚烯烃树脂发泡体和发泡密封材料
KR102097950B1 (ko) 수지 발포체 시트 및 수지 발포 복합체
WO2013168798A1 (fr) Mousse de résine et matériau d'étanchéité en mousse
JP6110213B2 (ja) 熱可塑性樹脂発泡体、発泡シール材及び熱可塑性樹脂発泡体の製造方法
JP2015199925A (ja) ポリオレフィン系樹脂薄層発泡シートおよびその製造方法、並びに粘着シート
WO2013187372A1 (fr) Mousse de résine et matière d'étanchéité moussée
JP6039505B2 (ja) 熱可塑性樹脂発泡体及びその製造方法並びに発泡シール材
JP6181248B2 (ja) 樹脂発泡体、その製造方法、及び発泡シール材
JP6533608B2 (ja) 樹脂発泡複合体

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: 13796727

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: 13796727

Country of ref document: EP

Kind code of ref document: A1