WO2014098124A1 - 樹脂発泡体、及び、発泡シール材 - Google Patents

樹脂発泡体、及び、発泡シール材 Download PDF

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Publication number
WO2014098124A1
WO2014098124A1 PCT/JP2013/083876 JP2013083876W WO2014098124A1 WO 2014098124 A1 WO2014098124 A1 WO 2014098124A1 JP 2013083876 W JP2013083876 W JP 2013083876W WO 2014098124 A1 WO2014098124 A1 WO 2014098124A1
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WO
WIPO (PCT)
Prior art keywords
resin
resin foam
polyester
resin composition
foam
Prior art date
Application number
PCT/JP2013/083876
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English (en)
French (fr)
Japanese (ja)
Inventor
加藤直宏
齋藤誠
加藤和通
児玉清明
Original Assignee
日東電工株式会社
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to JP2014524197A priority Critical patent/JPWO2014098124A1/ja
Publication of WO2014098124A1 publication Critical patent/WO2014098124A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • 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
    • C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
    • C09J167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C09J167/03—Polyesters derived from dicarboxylic acids and dihydroxy compounds the dicarboxylic acids and dihydroxy compounds having the carboxyl - and the hydroxy groups directly linked to aromatic rings
    • 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
    • C08J2201/03—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
    • C08J2201/00—Foams characterised by the foaming process
    • C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
    • C08J2201/032—Impregnation of a formed object with a gas
    • 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
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C08J2367/03—Polyesters derived from dicarboxylic acids and dihydroxy compounds the dicarboxylic acids and dihydroxy compounds having the hydroxy and the carboxyl groups directly linked to aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00—Presence of (meth)acrylic polymer
    • 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
    • C09J2453/00—Presence of block copolymer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
    • C09K2200/0645—Macromolecular organic compounds, e.g. prepolymers obtained otherwise than by reactions involving carbon-to-carbon unsaturated bonds
    • C09K2200/0655—Polyesters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • G02F2201/503—Arrangements improving the resistance to shock
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2848—Three or more layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2852—Adhesive compositions
    • Y10T428/2878—Adhesive compositions including addition polymer from unsaturated monomer
    • Y10T428/2891—Adhesive compositions including addition polymer from unsaturated monomer including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof

Definitions

  • the present invention relates to a resin foam and a foam sealing material.
  • the present invention relates to a polyester resin foam and a foam sealing material.
  • liquid crystal displays LCDs
  • an image display member fixed to an image display device such as an electroluminescence display or a plasma display, or an optical member such as a camera or a lens
  • the resin foam in use.
  • a resin foam is used as an impact absorbing material (gasket material) that protects a display from being damaged when an electronic device is dropped.
  • Examples of such resin foam include a polyurethane resin foam having a low-foam, closed-cell structure fine cell structure, a resin foam obtained by compression molding a highly foamed polyurethane-based resin foam, and a closed-cell structure.
  • a sealing material for electrical and electronic equipment comprising a polyethylene resin foam having an expansion ratio of about 30 times, a polyolefin resin foam having a density of 0.2 g / cm 3 or less, and a foam structure having an average cell diameter of 1 to 500 ⁇ m.
  • Patent Documents 1 and 2 are known (see Patent Documents 1 and 2).
  • Resin foam is often subjected to processing such as punching and cutting depending on the shape of the part to be used.
  • a shock absorber for an image display device such as a shock absorber for a mobile phone
  • it is punched into a frame shape of the image display device (for example, a sheet thickness of about 1 mm, a width of 1 to 2 mm, etc.) Is given.
  • the conventional resin foam has a function as an impact absorbing material and has flexibility, but the strength may not be sufficient.
  • the resin foam is required to have excellent flexibility, a function as an impact absorbing material, and a property (low dust generation property) that dust is hardly generated during processing such as punching.
  • an object of the present invention is to provide a resin foam, particularly a polyester resin foam, which is excellent in flexibility and excellent in low dust generation. Furthermore, the other object of this invention is to provide the foaming sealing material which is excellent in a softness
  • the tensile strength is set to a specific value or more, the repulsive force at 50% compression is within a specific range, and the delamination strength It was found that when the value is not less than a specific value, excellent low dust generation property can be obtained while obtaining flexibility, and the present invention has been completed.
  • the present invention has a tensile strength of 0.5 MPa or more, a repulsion force at 50% compression as defined below of 0.1 to 4.0 N / cm 2 , and a delamination strength as defined below. Is 5 N / 20 mm or more.
  • Repulsive force at 50% compression Repulsive load when compressing sheet-like resin foam to a thickness of 50% of the initial thickness in the thickness direction in an atmosphere at 23 ° C.
  • Interlaminar peel strength In a 23 ° C. atmosphere, a sheet-like resin foam is attached to the adhesive surface of an adhesive tape (trade name “No.
  • the resin foam preferably has an apparent density of 0.01 to 0.20 g / cm 3 .
  • the above resin foam preferably has an average cell diameter of 10 to 200 ⁇ m.
  • the above resin foam preferably has a maximum cell diameter of 300 ⁇ m or less.
  • the resin foam is preferably formed by foaming a resin composition containing a resin.
  • the resin is preferably a polyester resin.
  • the resin foam is preferably formed through a step of depressurizing the resin composition after impregnating the resin composition with a high-pressure inert gas.
  • the inert gas is preferably carbon dioxide.
  • the inert gas is preferably in a supercritical state.
  • the present invention provides a foamed sealing material comprising the above resin foam.
  • the foamed sealing material preferably has an adhesive layer on the resin foam.
  • the pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive layer.
  • the resin foam of this invention has the said structure, it has a softness
  • the resin foam of the present invention has a tensile strength of 0.5 MPa or more, a repulsive force at 50% compression defined below of 0.1 to 4.0 N / cm 2 , and an interlayer defined below.
  • the peel strength is 5 N / 20 mm or more.
  • Repulsive force at 50% compression Compressed sheet-like resin foam to a thickness of 50% of the initial thickness in the thickness direction in an atmosphere of 23 ° C. measured according to JIS K 6767 Repulsive load at the time of delamination
  • Delamination strength In a 23 ° C. atmosphere, a sheet-like resin foam was attached to the adhesive surface of an adhesive tape (trade name “No.
  • the repulsive force at the time of 50% compression may be simply referred to as “repulsive force at the time of 50% compression”.
  • the delamination strength defined above may be simply referred to as “delamination strength”.
  • the resin foam of the present invention is formed by foaming a composition (resin composition) containing at least a resin.
  • a composition resin composition
  • the “composition containing at least resin” used when forming the resin foam of the present invention may be referred to as “resin composition”.
  • the resin foam of the present invention is a polyester resin foam
  • such a polyester resin foam is obtained by foaming a composition containing at least a polyester resin (polyester resin composition). It is formed.
  • the said resin composition may be comprised only from resin.
  • the polyester resin composition may be a composition containing only a polyester resin.
  • the tensile strength of the resin foam of the present invention is 0.5 MPa or more, preferably 0.8 MPa or more, more preferably 1.0 MPa or more.
  • the tensile strength is not specifically limited, For example, it is preferable that it is 5 MPa, More preferably, it is 3 MPa.
  • the tensile strength is not particularly limited, but is preferably 0.5 to 5 MPa, for example.
  • the tensile strength in this specification shall mean the tensile strength measured based on JISK6767. Specifically, it can be measured by the method described in “(3) Tensile strength” in (Evaluation) described later.
  • the repulsive force (repulsive stress) at 50% compression of the resin foam of the present invention is 0.1 to 4.0 N / cm 2 , preferably 0.3 to 3.5 N / cm 2 , more preferably 0. .5 ⁇ 3.0N / cm 2, particularly preferably 1.6 ⁇ 2.5N / cm 2. It is preferable that the repulsive force at the time of 50% compression is 0.1 N / cm 2 or more because appropriate rigidity can be obtained and good workability can be easily obtained. Moreover, since the repulsion force at the time of 50% compression is 4.0 N / cm ⁇ 2 > or less, it is excellent in a softness
  • the repulsive force at the time of 50% compression means a compressive force (compression stress) when the compression rate is 50%.
  • the compression rate of 50% means that the sheet-like resin foam is compressed to a height (thickness) corresponding to 50% of the initial height (thickness) in the thickness direction, that is, 50% distorted from the initial thickness.
  • the thickness of the sheet-like resin foam in a state that the compression rate is 50% corresponds to a thickness of 50% of the initial thickness.
  • the repulsive force at the time of 50% compression is measured by the method described in “(5) Repulsive force at the time of 50% compression (a repulsive load at the time of 50% compression, a 50% compression load)” in (Evaluation) described later. be able to.
  • the delamination strength of the resin foam of the present invention is 5 N / 20 mm or more, preferably 10 N / 20 mm or more, more preferably 14 N / 20 mm or more, and even more preferably 18 N / 20 mm or more.
  • the delamination strength is not particularly limited, but is preferably 5 to 60 N / 20 mm, for example.
  • the upper limit of the delamination strength is not particularly limited, but is preferably 60 N / 20 mm, and more preferably 50 N / 20 mm, for example.
  • the delamination strength can be measured by the method described in “(4) Delamination strength” in (Evaluation) described later.
  • the apparent density of the resin foam of the present invention is not particularly limited, but is preferably 0.01 to 0.20 g / cm 3 , more preferably 0.02 to 0.17 g / cm 3 , and still more preferably 0.00. 03 ⁇ 0.15g / cm 3, particularly preferably 0.04 ⁇ 0.13g / cm 3. It is preferable that the apparent density is 0.01 g / cm 3 or more because good strength can be easily obtained. Moreover, it is preferable for the apparent density to be 0.20 g / cm 3 or less because a high expansion ratio can be obtained and further excellent flexibility can be easily obtained.
  • the apparent density of the resin foam of the present invention is 0.01 to 0.20 g / cm 3 , better foaming characteristics (high foaming ratio) can be obtained, better strength, and better flexibility. And easy cushioning.
  • the apparent density can be measured by the method described in “(1) Apparent density” in (Evaluation) described later.
  • the average cell diameter of the resin foam of the present invention is not particularly limited, but is preferably 10 to 200 ⁇ m, more preferably 15 to 150 ⁇ m, still more preferably 20 to 100 ⁇ m, for example.
  • the average cell diameter is 10 ⁇ m or more, further excellent flexibility is provided.
  • production of a pinhole can be suppressed as average cell diameter is 200 micrometers or less, and it has the outstanding dust resistance.
  • the maximum cell diameter of the resin foam of the present invention is not particularly limited, but is preferably 300 ⁇ m or less, more preferably 250 ⁇ m or less, and still more preferably 200 ⁇ m.
  • the maximum cell diameter is 300 ⁇ m or less, since a coarse cell is not included, the cell structure is excellent in uniformity and strength, and dust is hardly generated during processing. Moreover, it is excellent in light-shielding properties and has a good appearance. In addition, it is possible to suppress the problem that dust enters from a coarse cell and the dust resistance deteriorates, and the sealing performance and dust resistance are excellent.
  • the cell diameter in the cell structure of the resin foam of the present invention is obtained, for example, by capturing an enlarged image of the cut surface of the resin foam with a digital microscope, obtaining the area of the cells (bubbles) in the captured enlarged image, Calculated by conversion. Specifically, it can be measured by the method described in “(2) Average cell diameter, maximum cell diameter” in (Evaluation) described later.
  • the resin foam of the present invention has a cell structure (cell structure).
  • the cell structure of the resin foam of the present invention is not particularly limited, but is a semi-continuous semi-closed cell structure (a cell structure in which a closed-cell structure and an open-cell structure are mixed) in order to obtain better flexibility.
  • the ratio is not particularly limited). In particular, a cell structure in which the ratio of the closed cell structure portion in the polyester resin foam is 40% or less (preferably 30% or less) is preferable.
  • the shape of the resin foam of the present invention is not particularly limited, but for example, a sheet shape or a tape shape is preferable. Further, it may be processed into an appropriate shape according to the purpose of use. For example, it may be processed into a linear shape, a circular shape, a polygonal shape, a frame shape (frame shape), or the like by cutting, punching, or the like.
  • the thickness of the resin foam of the present invention is not particularly limited, but is preferably 0.05 to 5.0 mm, more preferably 0.06 to 3.0 mm, and still more preferably 0.07 to 1.5 mm. And more preferably 0.08 to 1.0 mm.
  • the resin foam of the present invention contains at least a resin.
  • the resin foam of the present invention is a polyester resin foam
  • at least a polyester resin is included. That is, the polyester resin composition forming the polyester resin foam contains at least a polyester resin.
  • the said polyester-type resin foam may contain other resin (resins other than polyester-type resin) with the polyester-type resin.
  • the resin that is the material of the resin foam of the present invention is not particularly limited, but a thermoplastic resin is preferably exemplified.
  • the resin foam of the present invention may be composed of only one kind of resin, or may be composed of two or more kinds of resins. That is, the resin foam of the present invention is preferably formed by foaming a thermoplastic resin composition containing a thermoplastic resin.
  • thermoplastic resin examples include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, copolymers of ethylene and propylene, ethylene or propylene and other ⁇ -olefins (for example, Copolymer with butene-1, pentene-1, hexene-1, 4-methylpentene-1, etc.), ethylene and other ethylenically unsaturated monomers (for example, vinyl acetate, acrylic acid, acrylic ester, Polyolefin resins such as copolymers with methacrylic acid, methacrylic acid esters, vinyl alcohol, etc.); styrene resins such as polystyrene, acrylonitrile-butadiene-styrene copolymers (ABS resins); 6-nylon, 66-nylon, Polyamide resin such as 12-nylon; polyamide Polyimide; Polyetherimide; Acrylic resin such as polymethyl methacrylate; Polyvinyl chloride; Poly
  • thermoplastic resin may be used individually or in combination of 2 or more types.
  • a thermoplastic resin is a copolymer
  • the copolymer of any form of a random copolymer and a block copolymer may be sufficient.
  • thermoplastic resin includes a rubber component and / or a thermoplastic elastomer component.
  • resin foam of this invention may be formed with the resin composition containing said thermoplastic resin and a rubber component and / or a thermoplastic elastomer component.
  • the rubber component or thermoplastic elastomer component is not particularly limited as long as it has rubber elasticity and can be foamed.
  • natural rubber polyisobutylene, polyisoprene, chloroprene rubber, butyl rubber, nitrile butyl rubber and the like are used.
  • olefin elastomer such as ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene-vinyl acetate copolymer, polybutene, chlorinated polyethylene; styrene-butadiene-styrene copolymer, styrene- Examples thereof include styrene elastomers such as isoprene-styrene copolymers and hydrogenated products thereof; polyester elastomers; polyamide elastomers; various thermoplastic elastomers such as polyurethane elastomers. Moreover, these rubber components or thermoplastic elastomer components may be used alone or in combination of two or more.
  • the resin foam of the present invention is preferably a resin foam (polyester resin foam) formed of a resin composition containing a polyester resin.
  • the polyester resin has high strength and high elastic modulus among thermoplastic resins.
  • the polyester-based resin is a resin having an ester bond in the main chain, and examples thereof include a resin having an ester bond in the main chain by a reaction (polycondensation) between a polyol and a polycarboxylic acid.
  • the polyester resins may be used alone or in combination of two or more.
  • polyester resin examples include polyester thermoplastic resins.
  • polyester resin include polyester thermoplastic elastomers.
  • the polyester-based resin foam of the present invention may be formed by foaming a polyester-based resin composition containing at least a polyester-based thermoplastic resin or a polyester-based thermoplastic elastomer, or a polyester-based thermoplastic resin and a polyester-based resin. It may be formed by foaming a polyester resin composition containing at least both thermoplastic elastomers.
  • the polyester resin foam preferably includes the polyester thermoplastic elastomer. That is, the polyester resin foam is preferably a polyester resin foam (thermoplastic elastomer foam) formed by foaming a polyester resin composition containing a polyester thermoplastic elastomer.
  • the polyester-based thermoplastic resin is not particularly limited, and examples thereof include polyalkylene terephthalate resins such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, and polycyclohexane terephthalate. It is done. Moreover, the copolymer obtained by copolymerizing 2 or more types of the said polyalkylene terephthalate type-resin is also mentioned.
  • polyalkylene terephthalate resins such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, and polycyclohexane terephthalate. It is done.
  • the copolymer obtained by copolymerizing 2 or more types of the said polyalkylene terephthalate type-resin is also mentioned.
  • the polyalkylene terephthalate resin when it is a copolymer, it may be a copolymer in any form of a random copolymer, a block copolymer, and a graft copolymer.
  • the said polyester-type thermoplastic resin may be used individually or in combination of 2 or more types.
  • the polyester-based thermoplastic elastomer is not particularly limited, and preferred examples thereof include polyester-based thermoplastic resins obtained by condensation polymerization of aromatic dicarboxylic acids (divalent aromatic carboxylic acids) and diol components. .
  • the said polyester-type thermoplastic elastomer may be used individually or in combination of 2 or more types.
  • aromatic dicarboxylic acid examples include terephthalic acid, isophthalic acid, phthalic acid, naphthalenecarboxylic acid (for example, 2,6-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, etc.), diphenyl ether dicarboxylic acid, 4,4 Examples include '-biphenyl dicarboxylic acid.
  • aromatic dicarboxylic acid may be used individually or in combination of 2 or more types.
  • diol component examples include ethylene glycol, propylene glycol, trimethylene glycol, 1,4-butanediol (tetramethylene glycol), 2-methyl-1,3-propanediol, 1,5-pentanediol, 2,2-dimethyl-1,3-propanediol (neopentyl glycol), 1,6-hexanediol, 3-methyl-1,5-pentanediol, 2-methyl-2,4-pentanediol, 1,7 -Heptanediol, 2,2-diethyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, 2-methyl-1,6-hexanediol, 1,8-octanediol, 2-butyl-2-ethyl-1,3-propanediol, 1,3,5-trimethyl-1,3-pe Tandiol, 1,9
  • the diol component may be a diol component in a polymer form such as polyether diol or polyester diol.
  • the polyether diol include polyether diols such as polyethylene glycol obtained by ring-opening polymerization of ethylene oxide, propylene oxide, tetrahydrofuran and the like, polypropylene glycol, polytetramethylene glycol, and copolyether obtained by copolymerization thereof. Can be mentioned.
  • a diol component may be used individually or in combination of 2 or more types.
  • polyester-based thermoplastic elastomer is not particularly limited, but a polyester-based elastomer that is a block copolymer of a hard segment and a soft segment is preferable.
  • polyester-based thermoplastic elastomer poly(polyester-based thermoplastic elastomer which is a block copolymer of hard segments and soft segments) is not particularly limited, and examples thereof include the following (i) to (iii).
  • a hard polyester is formed by polycondensation of the aromatic dicarboxylic acid and a diol component having 2 to 4 carbon atoms in the main chain between the hydroxyl group and the hydroxyl group of the diol component.
  • polyester / polyether having the same polyester as (i) above as a hard segment and a polyether such as the polyether diol and aliphatic polyether as a soft segment.
  • the polyester-based thermoplastic elastomer to be configured is preferably a polyester-based elastomer that is a block copolymer of a hard segment and a soft segment.
  • Polyester / polyether type copolymer in which the polyester to be formed is a hard segment and the polyether is a soft segment.
  • polyester / polyether type copolymer of (ii) is a polyester / polyether type block copolymer having polybutylene terephthalate as a hard segment and polyether as a soft segment. Etc.
  • the content of the resin such as the polyester resin is not particularly limited.
  • the total amount of the resin foam 70% by weight or more (more preferably 80% by weight or more).
  • content of the said polyester-type resin in the said polyester-type resin composition is not specifically limited, For example, 70 weight% or more (preferably 80 weight%) with respect to the polyester-type resin composition whole quantity (total weight, 100 weight%). % By weight or more).
  • the melt flow rate (MFR, melt mass flow rate) at 230 ° C. of the resin constituting the resin foam of the present invention is not particularly limited.
  • the amount is preferably 1.5 to 4.0 g / 10 min, more preferably 1.5 to 3.8 g / 10 min, and still more preferably 1.5 to 3.5 g / 10 min.
  • the melt flow rate at 230 ° C. is 1.5 g / 10 min or more, the moldability of the resin composition is improved, which is preferable. For example, it can be easily extruded in a desired shape from an extruder, that is, it is preferable. Moreover, it is preferable for the melt flow rate at 230 ° C.
  • the melt flow rate at 230 ° C. refers to a melt flow rate measured at a temperature of 230 ° C. and a load of 2.16 kgf based on ISO 1133 (JIS K 7210).
  • the polyester resin foam can be formed by foaming a polyester resin composition containing at least a polyester resin having a melt flow rate at 230 ° C. of 1.5 to 4.0 g / 10 min. preferable.
  • the polyester resin foam is a polyester thermoplastic elastomer foam
  • It is preferably formed by foaming a polyester resin composition containing at least a polyester thermoplastic elastomer) which is a block copolymer of segments.
  • the polyester resin foam may further contain other resin (resin other than the polyester resin). That is, the polyester resin composition may contain other resins.
  • the said other resin may be used individually or in combination of 2 or more types.
  • the other resin examples 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 other ⁇ -olefin (for example, Copolymer with butene-1, pentene-1, hexene-1, 4-methylpentene-1, etc.), ethylene and other ethylenically unsaturated monomers (for example, vinyl acetate, acrylic acid, acrylic ester, Polyolefin resins such as copolymers with methacrylic acid, methacrylic acid esters, vinyl alcohol, etc.); styrene resins such as polystyrene, acrylonitrile-butadiene-styrene copolymers (ABS resins); 6-nylon, 66-nylon, Polyamide resin such as 12-nylon; polyamide Bromide; polyurethane; polyimides; polyetherimides, acrylic resins such as polymethyl methacryl
  • the resin composition forming the resin foam of the present invention preferably contains a foam nucleating agent.
  • the polyester resin composition preferably contains a foam nucleating agent.
  • the said foam nucleating agent may be used individually or in combination of 2 or more types.
  • the foam nucleating agent is not particularly limited, and examples thereof include inorganic substances.
  • the inorganic substance include hydroxides such as aluminum hydroxide, potassium hydroxide, calcium hydroxide, and magnesium hydroxide; clay (particularly hard clay); talc; silica; zeolite; and alkali such as calcium carbonate and magnesium carbonate.
  • Earth metal carbonates for example, metal oxides such as zinc oxide, titanium oxide, and alumina; for example, various metal powders such as iron powder, copper powder, aluminum powder, nickel powder, zinc powder, titanium powder, alloy powder, etc.
  • Metal powder mica; carbon particles; glass fiber; carbon tube; layered silicate;
  • the inorganic substance in the foam nucleating agent is preferably clay or alkaline earth metal carbonate, more preferably hard from the viewpoint of suppressing the generation of coarse cells and easily obtaining a uniform and fine cell structure.
  • Clay is preferably clay or alkaline earth metal carbonate, more preferably hard from the viewpoint of suppressing the generation of coarse cells and easily obtaining a uniform and fine cell structure.
  • the above hard clay is a clay containing almost no coarse particles.
  • the hard clay has a 166 mesh sieve residue of preferably 0.01% or less, more preferably 0.001% or less.
  • the sieve residue (sieving residue) is a ratio (weight basis) to the whole although it remains without passing through when it is sieved (for example, 166 mesh).
  • the hard clay is composed of aluminum oxide and silicon oxide as essential components.
  • the total proportion of aluminum oxide and silicon oxide in the hard clay is preferably 80% by weight or more (for example, 80 to 100% by weight), more preferably 90% by weight with respect to the total amount of the hard clay (100% by weight). Or more (for example, 90 to 100% by weight).
  • the hard clay may be fired.
  • the average particle size (average particle size) of the hard clay is not particularly limited, but is preferably 0.1 to 10 ⁇ m, more preferably 0.2 to 5.0 ⁇ m, and still more preferably 0.5 to 1.0 ⁇ m. .
  • the inorganic material is preferably surface-treated. That is, the foam nucleating agent is preferably a surface-treated inorganic substance.
  • the surface treatment agent used for the surface treatment of the inorganic substance is not particularly limited, but by applying a surface treatment treatment, the affinity with the resin (particularly polyester resin) is improved, and at the time of foaming, molding, kneading From the point that voids do not occur during stretching, etc., and the effect that cells do not break during foaming, for example, aluminum compounds, silane compounds, titanate compounds, epoxy compounds, isocyanate compounds, higher fatty acids or Preferred are salts thereof and phosphate esters. Of these, silane compounds (particularly silane coupling agents), higher fatty acids or salts thereof (particularly stearic acid) are preferred.
  • the said surface treating agent may be used individually or in combination of 2 or more types.
  • the surface treatment of the inorganic material is a treatment with a silane coupling agent or a treatment with a higher fatty acid or a salt thereof.
  • the aluminum compound is not particularly limited, but an aluminum coupling agent is preferable.
  • the aluminum coupling agent include acetoalkoxyaluminum diisopropylate, aluminum ethylate, aluminum isopropylate, mono sec-butoxyaluminum diisopropylate, aluminum sec-butyrate, ethyl acetoacetate aluminum diisopropylate, aluminum tris. (Ethyl acetoacetate), aluminum monoacetylacetonate bis (ethylacetoacetate), aluminum tris (acetylacetonate), cyclic aluminum oxide isopropylate, cyclic aluminum oxide isostearate and the like.
  • the silane compound is not particularly limited, but a silane coupling agent is preferable.
  • the silane coupling agent include a vinyl group-containing silane coupling agent, a (meth) acryloyl group-containing silane coupling agent, an amino group-containing silane coupling agent, an epoxy group-containing silane coupling agent, Examples include mercapto group-containing silane coupling agents, carboxyl group-containing silane coupling agents, and halogen atom-containing silane coupling agents.
  • examples of the silane coupling agent include vinyltrimethoxysilane, vinylethoxysilane, dimethylvinylmethoxysilane, dimethylvinylethoxysilane, methylvinyldimethoxysilane, methylvinyldiethoxysilane, vinyl-tris (2 -Methoxy) silane, vinyltriacetoxysilane, 2-methacryloxyethyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-methacryloxy-propylmethyldimethoxysilane, 3-aminopropyl Trimethoxylane, 3-aminopropyltriethoxysilane, 2-aminoethyltrimethoxysilane, 3- [N- (2-aminoethyl) amino] propyltrimethoxysilane, 3- [N- (2- Minoethyl) amino] propyltri
  • the titanate compound is not particularly limited, but a titanate coupling agent is preferable.
  • the titanate coupling agent include isopropyl triisostearoyl titanate, isopropyl tris (dioctyl pyrophosphate) titanate, isopropyl tri (N-aminoethyl-aminoethyl) titanate, isopropyl tridecylbenzenesulfonyl titanate, tetraisopropyl bis titanate.
  • (Dioctyl phosphite) titanate tetraoctyl bis (ditridecyl phosphite) titanate, tetra (2,2-diallyloxymethyl-1-butyl) bis (di-tridecyl) phosphite titanate, bis (dioctyl pyrophosphate) oxy Acetate titanate, bis (dioctylpyrophosphate) ethylene titanate, isopropyl trioctanoyl titanate, isopropyl dimeta Lil isostearoyl titanate, isopropyl isostearoyl diacryl titanate, isopropyl tri (dioctyl phosphate) titanate, isopropyl tricumylphenyl titanate, dicumyl phenyloxy acetate titanate, etc. diisostearoyl ethylene titanate.
  • the epoxy compound is not particularly limited, but is preferably an epoxy resin or a monoepoxy compound.
  • the epoxy resin include glycidyl ether type epoxy resins such as bisphenol A type epoxy resins, glycidyl ester type epoxy resins, glycidyl amine type epoxy resins, and alicyclic epoxy resins.
  • the monoepoxy compound include styrene oxide, glycidyl phenyl ether, allyl glycidyl ether, glycidyl (meth) acrylate, 1,2-epoxycyclohexane, epichlorohydrin, and glycidol.
  • the isocyanate compound is not particularly limited, but is preferably a polyisocyanate compound or a monoisocyanate compound.
  • the polyisocyanate compounds include aliphatic diisocyanates such as tetramethylene diisocyanate and hexamethylene diisocyanate; alicyclic diisocyanates such as isophorone diisocyanate and 4,4′-dicyclohexylmethane diisocyanate; diphenylmethane diisocyanate and 2,4-tolylene diene.
  • Aromatic diisocyanates such as isocyanate, 2,6-tolylene diisocyanate, phenylene diisocyanate, 1,5-naphthylene diisocyanate, xylylene diisocyanate, toluylene diisocyanate; free isocyanate groups by reaction of these diisocyanate compounds with polyol compounds
  • the monoisocyanate compound include phenyl isocyanate and stearyl isocyanate.
  • higher fatty acids or salts thereof include higher fatty acids such as oleic acid, stearic acid, palmitic acid, and lauric acid, and salts of the higher fatty acids (for example, metal salts).
  • metal salts for example, metal salts.
  • the metal atom in the metal salt of the higher fatty acid include alkali metal atoms such as sodium atom and potassium atom, alkaline earth metal atoms such as magnesium atom and calcium atom.
  • the phosphoric acid esters are preferably phosphoric acid partial esters.
  • the phosphoric acid partial esters include phosphoric acid partial esters in which phosphoric acid (such as orthophosphoric acid) is partially esterified (mono or diesterified) with an alcohol component (such as stearyl alcohol), or the phosphoric acid.
  • phosphoric acid such as orthophosphoric acid
  • alcohol component such as stearyl alcohol
  • salts of partial esters metal salts such as alkali metals.
  • the method for surface treatment of the inorganic material with a surface treatment agent is not particularly limited, and examples thereof include a dry method, a wet method, and an integral blend method.
  • the amount of the surface treatment agent when the surface treatment is performed on the inorganic material is not particularly limited, but is preferably 0.1 to 10 parts by weight, more preferably 0. 3 to 8 parts by weight.
  • the 166 mesh sieve residue of the inorganic material is not particularly limited, but is preferably 0.01% or less, more preferably 0.001% or less. This is because, when foaming the resin composition (for example, the polyester-based resin composition or the like), if coarse particles are present, cell foaming tends to occur. This is because the size of the particles exceeds the thickness of the cell wall.
  • the average particle diameter (average particle diameter) of the inorganic substance is not particularly limited, but is preferably 0.1 to 10 ⁇ m, more preferably 0.2 to 5.0 ⁇ m, and still more preferably 0.5 to 1.0 ⁇ m. If the average particle diameter is less than 0.1 ⁇ m, the foam nucleating agent may not function sufficiently. On the other hand, if the average particle diameter is more than 10 ⁇ m, it may cause gas loss during foaming of the resin composition such as the polyester resin composition, which is not preferable.
  • the foam nucleating agent has an affinity with a resin (for example, affinity with a polyester-based resin) and generation of voids at an interface between the resin and an inorganic material (for example, an interface between a polyester-based resin and an inorganic material).
  • a resin for example, affinity with a polyester-based resin
  • an inorganic material for example, an interface between a polyester-based resin and an inorganic material.
  • Surface treatment is performed from the standpoint that a fine cell structure can be easily obtained by suppressing bubble breakage during foaming due to generation of voids, etc., and that the strength and flexibility of the polyester resin foam can be improved.
  • Inorganic materials are preferred.
  • the content of the foam nucleating agent in the resin composition is not particularly limited.
  • the content of the foam nucleating agent in the polyester resin composition is not particularly limited, but is preferably 0.1 to 20% by weight, more preferably based on the total amount of the polyester resin composition (100% by weight). Is 0.3 to 10% by weight, more preferably 0.5 to 6% by weight.
  • the content is 0.1% by weight or more, a site for forming bubbles (bubble forming site) can be sufficiently secured, and a fine cell structure is easily obtained, which is preferable.
  • the content is 20% by weight or less, it is possible to suppress the viscosity of the polyester resin composition from being significantly increased, and further, it is possible to suppress outgassing at the time of foaming of the polyester resin composition. Can be easily obtained.
  • the resin composition may contain a modified polymer.
  • the polyester resin composition preferably contains an epoxy-modified polymer.
  • the epoxy-modified polymer acts as a crosslinking agent. Moreover, it acts as a modifier (resin modifier) that improves the melt tension and strain hardening degree of the polyester resin composition (particularly the polyester resin composition containing a polyester elastomer). For this reason, when the epoxy resin composition contains an epoxy-modified polymer, the cell structure becomes highly foamed, fine and uniform, and the strength and flexibility are further improved. In addition, it is easy to obtain excellent characteristics for the carrier tape (for example, foam breakage inhibiting property at the time of peeling from the carrier tape, adhesiveness to the carrier tape, etc.).
  • Such modified polymers such as epoxy-modified polymers may be used alone or in combination of two or more.
  • the epoxy-modified polymer is not particularly limited.
  • the polyester-based resin composition is less likely to form a three-dimensional network structure than a compound having a low molecular weight epoxy group, and has excellent melt tension and strain hardening degree.
  • an epoxy-modified acrylic polymer that has an epoxy group at the end or side chain of an acrylic polymer main chain, or a polymer that has an epoxy group at the end or side chain of a main chain of polyethylene Preferably, the polymer is at least one polymer selected from epoxy-modified polyethylene.
  • the weight average molecular weight of the epoxy-modified polymer is not particularly limited, but is preferably 5,000 to 100,000, more preferably 8,000 to 80,000, still more preferably 10,000 to 70,000, particularly preferably. 20,000 to 60,000. In addition, when the molecular weight is less than 5,000, the reactivity of the epoxy-modified polymer increases, and high foaming may not be achieved.
  • the epoxy equivalent of the epoxy-modified polymer is not particularly limited, but is preferably 100 to 3000 g / eq, more preferably 200 to 2500 g / eq, still more preferably 300 to 2000 g / eq, and particularly preferably 800 to 1600 g / eq.
  • the epoxy equivalent of the epoxy-modified polymer is 3000 g / eq or less, the melt tension and strain hardening degree of the polyester resin composition are improved, the repulsive force at 50% compression is in an appropriate range, and the flexibility is improved. improves. Also, good strength can be obtained. Furthermore, it is easy to obtain a highly foamed and fine cell structure.
  • the epoxy equivalent of the epoxy-modified polymer is 100 g / eq or more, the reactivity of the epoxy-modified polymer is increased, the viscosity of the polyester-based resin composition becomes too high, and a problem that high foaming cannot be suppressed is preferable. .
  • the viscosity of the epoxy-modified polymer (B-type viscosity, 25 ° C.) is not particularly limited, but is preferably 2000 to 4000 mPa ⁇ s, more preferably 2500 to 3200 mPa ⁇ s. It is preferable for the viscosity of the epoxy-modified polymer to be 2000 mPa ⁇ s or more because it is easy to obtain a highly foamed and fine cell structure by suppressing the destruction of the cell walls during foaming of the polyester resin composition. On the other hand, when the viscosity is 4000 mPa ⁇ s or less, the fluidity of the polyester-based resin composition is easily obtained, and foaming can be efficiently performed.
  • the epoxy-modified polymer preferably has a weight average molecular weight of 5,000 to 100,000 and an epoxy equivalent of 100 to 3000 / eq.
  • the content of the modified polymer in the case where the resin composition includes a modified polymer is not particularly limited.
  • the content of the epoxy-modified polymer in the polyester resin composition is not particularly limited, but is preferably 0.5 to 15.0 parts by weight, more preferably 100 parts by weight of the polyester resin.
  • the amount is 0.6 to 10.0 parts by weight, more preferably 0.7 to 7.0 parts by weight, still more preferably 0.8 to 3.0 parts by weight.
  • the content of the epoxy-modified polymer is 0.5 parts by weight or more, the melt tension and strain hardening degree of the polyester resin composition can be increased, and the cell structure is excellent in strength, highly foamed, and fine. It becomes easy to obtain and preferable.
  • the content of the epoxy-modified polymer is 15.0 parts by weight or less, the viscosity of the polyester resin composition becomes too high and the problem that it cannot be highly foamed can be suppressed, and a highly foamed and fine cell. Since it becomes easy to obtain a structure, it is preferable.
  • the epoxy-modified polymer can prevent the polyester chain from being broken by hydrolysis (for example, hydrolysis due to moisture absorption of raw materials), thermal decomposition, oxidative decomposition, etc., and rebond the cut polyester chain. Therefore, the melt tension of the polyester resin composition can be further improved.
  • the epoxy-modified polymer since the epoxy-modified polymer has a large number of epoxy groups in one molecule, it is easier to form a branched structure than a conventional epoxy-based cross-linking agent, and the degree of strain hardening of the polyester-based resin composition is increased. Can be improved.
  • the resin composition contains a lubricant.
  • the polyester resin composition preferably includes a lubricant.
  • the resin composition such as the polyester-based resin composition contains a lubricant, the moldability of the resin composition is improved, which is preferable.
  • the slipping property is improved, which is preferable because it can be easily extruded in a desired shape from, for example, an extruder.
  • a lubricant may be used alone or in combination of two or more.
  • aliphatic carboxylic acid and its derivative For example, aliphatic carboxylic acid anhydride, alkali metal salt of aliphatic carboxylic acid, alkaline earth metal salt of aliphatic carboxylic acid, etc. Is mentioned.
  • Examples of the aliphatic carboxylic acid and derivatives thereof include lauric acid and derivatives thereof, stearic acid and derivatives thereof, crotonic acid and derivatives thereof, oleic acid and derivatives thereof, maleic acid and derivatives thereof, glutaric acid and derivatives thereof, behen Preference is given to fatty acid carboxylic acids having 3 to 30 carbon atoms such as acids and derivatives thereof, montanic acid and derivatives thereof, and derivatives thereof.
  • fatty acid carboxylic acids having 3 to 30 carbon atoms and derivatives thereof stearic acid and derivatives thereof, montanic acid and derivatives thereof are preferable from the viewpoints of dispersibility in the resin composition, solubility, and the effect of improving the surface appearance.
  • an alkali metal salt of stearic acid and an alkaline earth metal salt of stearic acid are preferable.
  • zinc stearate and calcium stearate are more preferable.
  • examples of the lubricant include acrylic lubricants.
  • examples of commercially available acrylic lubricants include acrylic polymer external lubricants (trade name “METABREN L”, manufactured by Mitsubishi Rayon Co., Ltd.).
  • an acrylic lubricant is preferable as the lubricant.
  • the content of the lubricant when the resin composition contains a lubricant is not particularly limited.
  • the content of the lubricant in the polyester resin composition is not particularly limited.
  • the content is preferably 0.1 to 20 parts by weight, more preferably 0.3 parts by weight with respect to 100 parts by weight of the polyester resin. -10 parts by weight, more preferably 0.5-8 parts by weight.
  • the content of the lubricant is 0.1 parts by weight or more, the effect obtained by including the lubricant is easily obtained, which is preferable.
  • the content of the lubricant is 20 parts by weight or less, it is possible to suppress a problem that bubbles cannot be removed when foaming the polyester-based resin composition, and a high foaming cannot be achieved.
  • the resin composition may contain a cross-linking agent as long as the effects of the present invention are not impaired.
  • the polyester resin composition may contain a cross-linking agent as long as the effects of the present invention are not impaired.
  • the crosslinking agent is not particularly limited.
  • epoxy crosslinking agent isocyanate crosslinking agent, silanol crosslinking agent, melamine resin crosslinking agent, metal salt crosslinking agent, metal chelate crosslinking agent, amino resin crosslinking agent. Agents and the like.
  • a crosslinking agent may be used individually or in combination of 2 or more types.
  • the resin composition may contain a crystallization accelerator as long as the effects of the present invention are not impaired.
  • the polyester resin composition may contain a crystallization accelerator as long as the effects of the present invention are not impaired.
  • an olefin resin is mentioned.
  • an olefin resin a resin having a broad molecular weight distribution and having a shoulder on the high molecular weight side, a micro-crosslinked resin (a slightly crosslinked resin), a long-chain branched resin, and the like are preferable.
  • the olefin resin examples 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, copolymers with pentene-1, hexene-1, 4-methylpentene-1, etc., ethylene and other ethylenically unsaturated monomers (for example, vinyl acetate, acrylic acid, acrylic ester, methacrylic acid) , Methacrylic acid esters, vinyl alcohol, etc.) and the like.
  • ⁇ -olefin for example, butene- 1, copolymers with pentene-1, hexene-1, 4-methylpentene-1, etc.
  • ethylene and other ethylenically unsaturated monomers for example, vinyl acetate, acrylic acid, acrylic ester, methacrylic acid
  • Methacrylic acid esters vinyl alcohol, etc.
  • the olefin resin when the olefin resin is a copolymer, it may be a copolymer in any form of a random copolymer or a block copolymer. Moreover, an olefin resin may be used individually or in combination of 2 or more types.
  • the above-mentioned resin composition may contain a flame retardant as long as the effects of the present invention are not impaired.
  • the polyester-based resin composition may contain a flame retardant as long as the effects of the present invention are not impaired.
  • the polyester-based resin foam contains a polyester-based resin and has a characteristic of being easily flammable, but it may be used for applications indispensable to impart flame retardancy such as electrical equipment or electronic equipment.
  • the flame retardant for example, the powder particle (for example, various powdery flame retardants etc.) which has a flame retardance is mentioned, An inorganic flame retardant is mentioned preferably.
  • the inorganic flame retardant may be, for example, a brominated flame retardant, a chlorine flame retardant, a phosphorus flame retardant, an antimony flame retardant, or the like.
  • Non-halogen-non-antimony-based gas components are generated that are harmful to equipment and corrosive to equipment. Phosphorus flame retardants and antimony flame retardants are harmful and explosive.
  • Inorganic flame retardants inorganic flame retardants free of halogen compounds and antimony compounds) are preferred.
  • the non-halogen-nonantimony inorganic flame retardant include aluminum hydroxide, magnesium hydroxide, hydrated metal compounds such as magnesium oxide / nickel oxide hydrate, magnesium oxide / zinc oxide hydrate, and the like. It is done. The hydrated metal oxide may be surface treated.
  • the said flame retardant may be used individually or in combination of 2 or more types.
  • the following additives may be included in the resin composition as necessary within a range not impairing the effects of the present invention.
  • the following additives may be included in the polyester-based resin composition as necessary, as long as the effects of the present invention are not impaired.
  • additives include crystal nucleating agents, plasticizers, colorants (for example, carbon black, pigments, dyes for the purpose of black coloring), ultraviolet absorbers, antioxidants, anti-aging agents, and reinforcement.
  • an additive may be used individually or in combination of 2 or more types.
  • the polyester-based resin composition is easy to obtain a polyester-based resin foam having a tensile strength of a predetermined value or more, a repulsive force at 50% compression within a specific range, and a delamination strength within a specific range. From this point, it is preferable that at least the following (i) and (ii) are included.
  • a polyester-based thermoplastic elastomer that is a block copolymer of hard segments and soft segments, more preferably a melt flow rate (MFR) at 230 ° C. of 1.5 to 4.0 g / 10 min.
  • MFR melt flow rate
  • Foam nucleating agent preferably surface-treated inorganic material, more preferably surface-treated hard clay
  • the melt tension (take-off speed: 2.0 m / min) of the resin composition such as the polyester resin composition is not particularly limited, but is preferably 13 to 70 cN, more preferably 15 to 60 cN, and still more preferably 15 to 55 cN, even more preferably 26 to 50 cN.
  • the melt tension is 13 cN or more, when the resin composition is foamed, it is easy to obtain a large expansion ratio and form independent bubbles, and the shape of the formed bubbles tends to be uniform. Therefore, it is preferable.
  • the melt tension is 70 cN or less, it is easy to obtain good fluidity, which is preferable because an adverse effect on foaming due to a decrease in fluidity can be suppressed.
  • the above melt tension refers to the tension when a specified apparatus is used and a molten resin extruded from a specified die at a specified temperature and extrusion speed is drawn into a strand at a specified take-up speed.
  • a Capillary Extension Rheometer manufactured by Malvern was used, and the resin extruded at a constant speed of 8.8 mm / min from a capillary having a diameter of 2 mm and a length of 20 mm was taken up at a take-up speed of 2 m / min.
  • the value is the melt tension.
  • the melt tension is a value measured at a temperature of 10 ⁇ 2 ° C. from the melting point of the resin of the resin composition to the high temperature side. This is because the resin does not enter a molten state at a temperature lower than the melting point, and on the other hand, at a temperature greatly exceeding the melting point to the high temperature side, the resin becomes completely fluid and the melt tension cannot be measured.
  • the strain hardening degree (strain rate: 0.1 [1 / s]) of the resin composition such as the polyester-based resin composition is not particularly limited, but it is possible to obtain a uniform and dense cell structure, and at the time of foaming From the viewpoint of suppressing cell foaming and obtaining a highly foamed foam, 2.0 to 5.0 is preferable, and 2.5 to 4.5 is more preferable.
  • the strain hardening degree of the resin composition is a degree of strain hardening at the melting point of the resin of the resin composition.
  • the degree of strain hardening deviates from the region (linear region) where uniaxial elongational viscosity gradually increases with increasing strain after the start of measurement, and the region where uniaxial elongational viscosity rises (nonlinear region). Is an index indicating the degree of increase in uniaxial elongational viscosity.
  • the resin foam of the present invention is preferably formed by foaming the resin composition.
  • the polyester resin foam is preferably formed by foaming the polyester resin composition.
  • the foaming method of the resin composition such as the polyester-based resin composition is not particularly limited, but a high-pressure gas (for example, a pressure of 3 MPa or more (for example, 3 to 100 MPa) is applied to the resin composition such as the polyester-based resin composition).
  • a high-pressure gas for example, a pressure of 3 MPa or more (for example, 3 to 100 MPa
  • a foaming method in which a gas (in particular, an inert gas described later) is impregnated and then depressurized (pressure is released) is preferable.
  • the resin foam of the present invention is a step in which the resin composition is impregnated with a high-pressure gas (for example, a gas having a pressure of 3 MPa or more (for example, 3 to 100 MPa), particularly an inert gas described later) and then depressurizing ( It is preferably formed through a step of releasing pressure.
  • a high-pressure gas for example, a gas having a pressure of 3 MPa or more (for example, 3 to 100 MPa), particularly an inert gas described later.
  • a high-pressure gas for example, a gas having a pressure of 3 MPa or more (for example, 3 to 100 MPa), particularly an inert gas described later. It is preferably formed through a step (step of releasing pressure).
  • the gas is preferably an inert gas from the viewpoint that a clean resin foam (for example, a clean polyester resin foam) is easily obtained.
  • the inert gas refers to a gas that is inert to the polyester-based resin composition and can be impregnated.
  • the inert gas is not particularly limited, and examples thereof include carbon dioxide gas (carbon dioxide gas), nitrogen gas, helium, and air. These gases may be used as a mixture. Among these, carbon dioxide gas is preferable because it has a large amount of impregnation and a high impregnation rate.
  • examples of the foaming method of the resin composition such as the polyester resin composition include a physical foaming method (a foaming method using a physical method) and a chemical foaming method (a foaming method using a chemical method).
  • a physical foaming method there is concern about the flammability and toxicity of substances used as the foaming agent (foaming agent gas) and environmental impacts such as ozone layer destruction, but the foaming method using an inert gas is This is an environmentally friendly method in that no foaming agent is used.
  • the residue of the foaming gas generated by the foaming agent remains in the foam, so that contamination by corrosive gas and impurities in the gas is a problem, especially for electronic devices where low pollution requirements are high. It may become.
  • the gas is preferably in a supercritical state.
  • the solubility of the gas in the resin composition such as the polyester-based resin composition is increased, and high concentration can be mixed.
  • the pressure drops rapidly after impregnation, it is possible to impregnate at a high concentration as described above, so that the generation of bubble nuclei increases, and the density of bubbles formed by the growth of the bubble nuclei is the porosity. Even if they are the same, they become large, so that fine bubbles can be obtained.
  • Carbon dioxide has a critical temperature of 31 ° C. and a critical pressure of 7.4 MPa.
  • the resin foam of the present invention is preferably produced by impregnating the resin composition with a high-pressure inert gas.
  • the resin composition is preliminarily formed into a sheet form or the like. After forming into an appropriate shape of the above to make an unfoamed resin molded body (unfoamed molded product), this unfoamed resin molded body is impregnated with a high-pressure gas and foamed by releasing the pressure.
  • a continuous method may be used in which the resin composition is kneaded together with a high-pressure gas under pressure, molded and simultaneously released to simultaneously perform molding and foaming.
  • the resin foam of the present invention is manufactured by a batch method.
  • an unfoamed resin molded body is first manufactured when the resin foam is manufactured.
  • the method for manufacturing the unfoamed resin molded body is not particularly limited.
  • Method of molding using an extruder such as a screw extruder or a twin screw extruder; the above resin composition is uniformly kneaded using a kneader equipped with blades such as rollers, cams, kneaders, and banbari molds.
  • the unfoamed resin molded body having a desired shape and thickness can be obtained.
  • the unfoamed resin molded body may be manufactured by other molding methods besides extrusion molding, press molding, and injection molding.
  • the shape of the unfoamed resin molded body is not limited to a sheet shape, and various shapes are selected according to the application. For example, a sheet shape, a roll shape, a prism shape, a plate shape, and the like can be given.
  • the unfoamed resin molded body (molded body made of the resin composition) is placed in a pressure-resistant container (high-pressure container), and a high-pressure gas is injected (introduced).
  • the high-pressure gas injection may be performed continuously or discontinuously.
  • a heating method for growing bubble nuclei a known or conventional method such as a water bath, an oil bath, a hot roll, a hot air oven, a far infrared ray, a near infrared ray, or a microwave may be employed.
  • the resin foam of the present invention is formed by impregnating a non-foamed molded article composed of the above resin composition with a high-pressure gas (particularly inert gas) and then foaming it through a decompression step. May be.
  • a high-pressure gas especially inert gas
  • the polyester-based resin foam is foamed through a step of reducing pressure after impregnating a non-foamed molded product composed of the polyester-based resin composition with a high-pressure gas (particularly an inert gas). It may be formed.
  • pressure gas especially inert gas
  • the resin composition is injected (introduced) with high-pressure gas while kneading the resin composition using an extruder such as a single screw extruder or a twin screw extruder.
  • an extruder such as a single screw extruder or a twin screw extruder.
  • a heating step of growing bubbles by heating may be provided.
  • the resin foam is obtained by rapidly cooling with cold water or the like to fix the shape.
  • an injection molding machine or the like may be used in addition to the extruder.
  • the resin foam of the present invention may be formed by impregnating the molten resin composition with a high-pressure gas (especially an inert gas) and then foaming it through a pressure reducing step.
  • the resin foam of the present invention may be formed by impregnating the molten resin composition with a high-pressure gas (particularly inert gas) and then further heating it through a pressure reduction step.
  • the polyester-based resin foam may be formed by impregnating the molten polyester-based resin composition with a high-pressure gas (particularly an inert gas) and then foaming it through a pressure reducing step.
  • the polyester resin foam may be formed by impregnating the molten polyester resin composition with a high-pressure gas (particularly an inert gas) and then heating it through a pressure reducing step. Good.
  • the mixing amount (injection amount) of the gas (particularly inert gas) is not particularly limited.
  • the mixing amount is lower than 1% by weight, the cell diameter may increase.
  • the force applied to each cell during processing such as punching increases, and dust is likely to be generated.
  • the pressure when impregnating a gas (particularly inert gas) into an unfoamed resin molded article or a resin composition such as the polyester resin composition is as follows: It is preferably 3 MPa or more (for example, 3 to 100 MPa), more preferably 4 MPa or more (for example, 4 to 100 MPa).
  • the pressure of the gas is lower than 3 MPa, the bubble growth during foaming is remarkable, the bubble diameter becomes too large, and disadvantages such as, for example, a decrease in the dustproof effect are likely to occur, which is not preferable.
  • the temperature at which a resin composition such as an unfoamed resin molded article or the above-mentioned polyester resin composition is impregnated with a high-pressure gas (particularly inert gas) in a gas impregnation step in a batch method or a kneading impregnation step in a continuous method can be selected in a wide range, but considering operability and the like, 10 to 350 ° C. is preferable.
  • the impregnation temperature when impregnating a sheet-like unfoamed resin molded article with a high-pressure gas (particularly inert gas) is preferably 40 to 300 ° C., more preferably 100 to 250 ° C.
  • the temperature at which a high-pressure gas (particularly an inert gas) is injected into the resin composition such as the polyester resin composition and kneaded is preferably 150 to 300 ° C., more preferably 210 to 250. ° C.
  • the temperature during impregnation is preferably 32 ° C. or higher (particularly 40 ° C. or higher) in order to maintain a supercritical state.
  • the decompression speed is not particularly limited, but is preferably 5 to 300 MPa / s in order to obtain uniform fine bubbles.
  • the heating temperature in the heating step is not particularly limited, but is preferably 40 to 250 ° C, more preferably 60 to 250 ° C.
  • a resin foam having a high expansion ratio can be produced, so that a thick resin foam can be obtained.
  • a polyester resin foam having a high expansion ratio can be produced, and thus a thick polyester resin foam can be obtained.
  • the gap of the die attached to the tip of the extruder is as narrow as possible (usually 0.1 to 1). 0.0 mm).
  • the polyester resin composition extruded through a narrow gap must be foamed at a high magnification, but conventionally, a high foaming magnification cannot be obtained.
  • the thickness of the formed foam has been limited to a thin one (for example, 0.5 to 2.0 mm).
  • the polyester resin foam having a final thickness of 0.30 to 5.00 mm is used. It is possible to obtain a body continuously.
  • the resin foam of the present invention such as the above-mentioned polyester resin foam, has a tensile strength of a specific value or more and a delamination strength of a specific value or more, so it generates dust during processing such as punching. Difficult and low dust generation. In addition, the overall strength is excellent.
  • the resin foam of the present invention such as the above-mentioned polyester resin foam is excellent in flexibility because the repulsive force at the time of 50% compression is in a specific range. Further, even if the applied clearance is small, the adaptability is excellent.
  • the resin foam of the present invention such as the polyester resin foam
  • the resin foam of the present invention has the above characteristics, it is suitably used as a sealing material or a dustproof material for electric equipment or electronic equipment. Further, it is preferably used as a shock absorbing material and a shock absorbing material, particularly as a shock absorbing material and a shock absorbing material for electric equipment or electronic equipment.
  • Examples of the electric device or electronic device include a portable electric device or electronic device.
  • Examples of such portable electric devices or electronic devices include mobile phones, PHS, smartphones, tablets (tablet computers), mobile computers (mobile PCs), personal digital assistants (PDAs), electronic notebooks, and portable televisions.
  • portable broadcast receivers such as portable radios, portable game machines, portable audio players, portable DVD players, digital camera cameras, camcorder video cameras, and the like.
  • examples of the electric device or electronic device other than the portable electric device or electronic device include home appliances and personal computers.
  • the resin foam of the present invention such as the polyester resin foam is assembled as a foam seal material (foam seal material of the present invention described later) in the clearance of the portable electric device or electronic device such as a mobile phone. Even when a clearance is deformed to a state where the clearance is not completely blocked or a dent is formed, it is quickly and sufficiently recovered from the deformation or the dent so that the clearance is sufficient. It is possible to effectively prevent foreign matter such as dust from entering.
  • the foam sealing material of the present invention includes at least the resin foam of the present invention such as the above-mentioned polyester-based foam.
  • the foamed sealing material of the present invention is not particularly limited.
  • the foamed sealing material may be composed of only the resin foam of the present invention, or the resin foam and other layers (especially an adhesive layer (adhesive layer)). Or a base material layer).
  • the foamed sealing material of the present invention may be composed only of the polyester resin foam, or the polyester resin foam and other layers (especially an adhesive layer (adhesive layer)). Or a base material layer).
  • the shape of the foamed sealing material of the present invention is not particularly limited, but a sheet shape (including a film shape) and a tape shape are preferable.
  • the foamed sealing material may be processed so as to have a desired shape and thickness. For example, various shapes may be processed according to the device, equipment, casing, member, and the like used.
  • the foamed sealing material of the present invention preferably has an adhesive layer.
  • the foamed sealing material of the present invention preferably has an adhesive layer on the resin foam of the present invention such as the polyester resin foam.
  • the foaming sealing material of this invention is a sheet form, it is preferable to have an adhesive layer in the single side
  • a processing mount can be provided on the foamed sealing material of the present invention via the adhesive layer, and further, an adherend (for example, , And can be fixed or temporarily fixed to a housing or a part.
  • the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is not particularly limited.
  • an acrylic 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
  • an adhesive examples thereof include an adhesive, a urethane-based adhesive, a polyamide-based adhesive, an epoxy-based adhesive, a vinyl alkyl ether-based adhesive, and a fluorine-based adhesive.
  • An adhesive may be used individually or in combination of 2 or more types.
  • the pressure-sensitive adhesive may be any form 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, or a solid-type pressure-sensitive adhesive.
  • an acrylic pressure-sensitive adhesive is preferable from the viewpoint of preventing contamination of the adherend. That is, the foamed sealing material of the present invention preferably has an acrylic pressure-sensitive adhesive layer on the resin foam of the present invention such as the polyester resin foam.
  • the thickness of the pressure-sensitive adhesive layer is not particularly limited, but is preferably 2 to 100 ⁇ m, more preferably 10 to 100 ⁇ m.
  • the thinner the pressure-sensitive adhesive layer the higher the effect of preventing the adhesion of dust and dirt at the end, so the thinner the adhesive layer is preferable.
  • the pressure-sensitive adhesive layer may have either a single layer or a laminate.
  • 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, and base material layers (particularly film layers and nonwoven fabric layers).
  • 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 includes the resin foam of the present invention such as the above-mentioned polyester resin foam, it is excellent in low dust generation and excellent in flexibility. Furthermore, it is excellent in strength as a whole foamed sealing material.
  • the foamed sealing material of the present invention has the characteristics as described above, it is suitably used as a sealing material used when various members or parts are attached (attached) to a predetermined site.
  • a sealing material used when a component constituting the electrical or electronic device is attached (attached) to a predetermined site is suitably used as a sealing material used when a component constituting the electrical or electronic device is attached (attached) to a predetermined site.
  • electric or electronic devices include the portable electric devices and electronic devices described above.
  • the various members or parts that can be attached (attached) using the foamed sealing material are not particularly limited, and preferred examples 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 parts such as cameras and lenses (particularly small cameras and lenses) that are mounted on mobile communication devices such as so-called “mobile phones” and “portable information terminals”.
  • the foamed sealing material of the present invention for example, around a display unit such as an LCD (liquid crystal display) or a display unit and a housing such as an LCD (liquid crystal display) for the purpose of dust prevention, light shielding, buffering, etc. (Window part) It can be used by being sandwiched between.
  • a display unit such as an LCD (liquid crystal display) or a display unit and a housing such as an LCD (liquid crystal display) for the purpose of dust prevention, light shielding, buffering, etc. (Window part) It can be used by being sandwiched between.
  • Example 1 Block copolymer of polybutylene terephthalate as a hard segment and polyether as a soft segment (trade name “Perprene P-90BD”, manufactured by Toyobo Co., Ltd., 230 ° C. melt flow rate: 3.0 g / 10 min): 100 Part by weight, acrylic lubricant (trade name “Metablene L-1000”, manufactured by Mitsubishi Rayon Co., Ltd.): 5 parts by weight, hard clay treated with a silane coupling agent (trade name “ST-301”, Shiraishi Calcium Co., Ltd.): 1 part by weight, carbon black (trade name “Asahi # 35”, Asahi Carbon Co., Ltd.): 5 parts by weight, and epoxy acrylic resin (epoxy-modified acrylic polymer, weight average molecular weight: 50000) Epoxy equivalent: 1200 g / eq, viscosity: 2850 mPa ⁇ s): 1.7 weight The part was kneaded at a temperature of 2
  • Example 2 Block copolymer of polybutylene terephthalate as a hard segment and polyether as a soft segment (trade name “Perprene P-90BD”, manufactured by Toyobo Co., Ltd., 230 ° C.
  • Example 3 Block copolymer of polybutylene terephthalate as a hard segment and polyether as a soft segment (trade name “Perprene P-90BD”, manufactured by Toyobo Co., Ltd., 230 ° C.
  • acrylic lubricant trade name “Metablene L-1000”, manufactured by Mitsubishi Rayon Co., Ltd.
  • hard clay trade name “ST-301”, manufactured by Shiraishi Calcium Co., Ltd., surface with
  • pellet-shaped resin composition was obtained.
  • This pellet-shaped resin composition was put into a single screw extruder (manufactured by Nippon Steel Works), and carbon dioxide gas was injected at a pressure of 17 (13 after injection) MPa in an atmosphere of 240 ° C. After sufficiently saturating the carbon dioxide gas, it was cooled to a temperature suitable for foaming and extruded from a die to obtain a sheet-like resin foam having a thickness of 1.5 mm.
  • the mixing amount of carbon dioxide gas was 3.2% by weight with respect to the total amount (100% by weight) of the pellet-shaped resin composition.
  • Comparative Example 1 Commercially available apparent density of 0.15 g / cm 3 , average cell diameter of 160 ⁇ m, maximum cell diameter of 180 ⁇ m, tensile strength of 0.2 MPa, repulsive force at 50% compression of 1.00 N / cm 2 , delamination strength A polyurethane foam-based resin foam was used, which was 7.25 N / 20 mm. This resin foam was a sheet and had a thickness of 1.0 mm.
  • Comparative Example 2 35 parts by weight of polypropylene, 60 parts by weight of polyolefin elastomer, 5 parts by weight of polyethylene, 10 parts by weight of magnesium hydroxide, 10 parts by weight of carbon black (trade name “Asahi # 35”, manufactured by Asahi Carbon Co., Ltd.) JSW) was kneaded at a temperature of 200 ° C. using a twin-screw kneader, extruded into a strand, cooled to water, and formed into a pellet. And the pellet-shaped resin composition was obtained.
  • This pellet-shaped resin composition was put into a single screw extruder manufactured by Nippon Steel Works, and carbon dioxide gas was injected at a pressure of 13 (12 after injection) MPa in an atmosphere of 220 ° C. Carbon dioxide gas was injected at a rate of 5.0% by weight with respect to the total amount of the pellet-shaped resin composition (100% by weight). After sufficiently saturating the carbon dioxide gas, it was cooled to a temperature suitable for foaming and extruded from a die to obtain a resin foam.
  • melt tension The melt tension of the resin composition was measured using a Capillary Extension Rheometer manufactured by Malvern, and the resin extruded at a constant speed of 8.8 mm / min from a capillary having a diameter of 2 mm and a length of 20 mm was 2 m / min. The tension when taken at the take-up speed of min was taken as the melt tension. In addition, the pellet before foam molding was used for the measurement. The temperature at the time of measurement was 10 ⁇ 2 ° C. on the high temperature side from the melting point of the resin.
  • strain hardening degree For measurement of the degree of strain hardening of the resin composition, pellets before foam molding were used. The pellet was formed into a sheet having a thickness of 1 mm using a heated hot plate press, and a sheet was obtained. A sample (length: 10 mm, width: 10 mm, thickness: 1 mm) was cut out from the sheet. . From the above sample, the uniaxial elongation viscosity at a strain rate of 0.1 [1 / s] was measured using a uniaxial elongation viscometer (manufactured by TA Instruments). And the strain hardening degree was calculated
  • Degree of strain hardening log ⁇ max / log ⁇ 0.2 ( ⁇ max indicates the extensional viscosity when the uniaxial extensional viscosity is the highest, and ⁇ 0.2 indicates the extensional viscosity when the strain ⁇ is 0.2.)
  • the temperature at the time of measurement was the melting point of the resin.
  • test piece was affixed to the other adhesive surface of the adhesive tape fixed on the SUS plate, and pressure-bonded under conditions of a 2 kg roller and one reciprocation. After pressure bonding, the test piece was peeled from the adhesive tape under the conditions of a peeling angle of 90 ° and a tensile speed of 0.3 m / min using a tensile tester (device name “TCN-1kNB”, manufactured by Minebea). The peel strength (N / 20 mm) at that time was measured, and the obtained measured value was defined as the delamination strength.
  • Dust generation (mg) (initial weight)-(weight after rotation) The calculated dust generation amount is shown in the column of “dust generation dust generation amount (mg)”. Also, the case where the dust generation amount was less than 1 mg was evaluated as “good”, and the case where the dust generation amount was 1 mg or more was evaluated as “bad”, and was shown in the column of “evaluation of dust generation”.
  • the resin foam of the present invention had a repulsive force at 50% compression of 0.1 to 4.0 N / cm 2 and was flexible. In addition, the amount of dust generation was small and the dust generation was excellent. On the other hand, the resin foam with low tensile strength and low delamination strength generated a large amount of dust (Comparative Example 1). Moreover, although the tensile strength was 0.5 MPa or more, dust was generated even in the resin foam having a low delamination strength (Comparative Example 2).
  • the resin foam and foam seal material of the present invention are excellent in flexibility and low dust generation. For this reason, it can use suitably for a sealing material, a dustproof material, a shock absorbing material, a shock absorber, etc.

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