WO2013054620A1 - 樹脂発泡体シート及び樹脂発泡複合体 - Google Patents
樹脂発泡体シート及び樹脂発泡複合体 Download PDFInfo
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- WO2013054620A1 WO2013054620A1 PCT/JP2012/073071 JP2012073071W WO2013054620A1 WO 2013054620 A1 WO2013054620 A1 WO 2013054620A1 JP 2012073071 W JP2012073071 W JP 2012073071W WO 2013054620 A1 WO2013054620 A1 WO 2013054620A1
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- resin foam
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- foam sheet
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/36—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/56—After-treatment of articles, e.g. for altering the shape
- B29C44/5627—After-treatment of articles, e.g. for altering the shape by mechanical deformation, e.g. crushing, embossing, stretching
- B29C44/5636—After-treatment of articles, e.g. for altering the shape by mechanical deformation, e.g. crushing, embossing, stretching with the addition of heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/56—After-treatment of articles, e.g. for altering the shape
- B29C44/5627—After-treatment of articles, e.g. for altering the shape by mechanical deformation, e.g. crushing, embossing, stretching
- B29C44/5654—Subdividing foamed articles to obtain particular surface properties, e.g. on multiple modules
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- 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
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- 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
- C08J9/0066—Use of inorganic compounding ingredients
-
- 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
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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
- 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
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- 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
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- 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
- C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
- C08J2491/06—Waxes
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- 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
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249982—With component specified as adhesive or bonding agent
- Y10T428/249983—As outermost component
Definitions
- the present invention relates to a resin foam sheet and a resin foam composite including the resin foam sheet.
- Resin foam is used as a sealing material and cushioning material for electronic equipment, including cushioning materials, heat insulating materials, packaging materials and building materials during transportation.
- the area of resin foam used as a sealing material and cushioning material has become smaller with the downsizing of electronic equipment and the increase in screen size. Flexibility to demonstrate In addition, thinning of electronic devices is also progressing, and thinning of the resin foam is also required.
- a foam sheet obtained by a method in which a compression treatment or a stretching treatment is performed during foaming or in a later step or a method in which a coating treatment is performed after foaming for example, Patent Document 1, Patent Document 2.
- the above foam sheet has a problem that it is difficult to reduce the expansion ratio, and when it is compressed, for example, the repulsive force at 25% compression (repulsive stress at 25% compression) exceeds 3 N / cm 2. There was a problem that the repulsive force of.
- the design gap in which resin foam is used (gap, gap) has become very narrow (for example, a gap of 0.1 mm), and resin foam has a design tolerance of 50. It is not uncommon for the product to be compressed to more than%. However, if a resin foam having a large repulsive force when compressed is used in a very narrow design gap of such a display device, display unevenness occurs in the liquid crystal of the display unit due to the high repulsive force. It may cause defects.
- the resin foam When the resin foam is distributed in the market, it is continuously wound up and often takes the form of a roll such as “continuous roll” or “long roll”. For this reason, it is preferable that a resin foam does not generate
- an object of the present invention is to provide a resin foam sheet that has a low apparent density, is thin and flexible, and has excellent winding stability (winding stability).
- another object of the present invention is to provide a resin foam sheet that has a low apparent density, is thin and flexible, has excellent winding stability, and is excellent in thickness accuracy.
- the present inventors have melted a part of the thickness direction of the resin foam and returned it to the bulk (non-foamed state), thereby maintaining the strength of the resin foam and being flexible.
- the present inventors have found that a thin resin foam sheet can be obtained while suppressing deterioration of physical properties such as properties.
- seat which is excellent in thickness precision in addition to the above was obtained by fuse
- the present invention has been completed based on these findings.
- the present invention has an apparent density of 0.03 to 0.30 g / cm 3 , a compressive stress at 50% compression of 5.0 N / cm 2 or less, a thickness of 0.05 mm to 0.40 mm, and a length of Provided is a resin foam sheet characterized by having a width of 5 m or more and a width of 300 mm or more.
- the resin foam sheet preferably has a value obtained from the following formula (1) of 25% or less.
- Thickness tolerance The thickness is measured every 10 mm in the width direction from one end to the other at one point in the length direction, and one point at a point moved 1 m in the length direction from one point in the length direction. The thickness is measured every 10 mm in the width direction from the end to the other end, and the difference between the maximum value and the minimum value of all the measured values obtained.
- Median thickness Measured thickness every 10 mm in the width direction from one end to the other at one point in the length direction, and further moved 1 m in the length direction from one point in the length direction. The thickness is measured every 10 mm in the width direction from one end portion to the other end portion, and is a value located in the center when all the obtained measurement values are arranged in ascending order.
- the resin foam sheet preferably has a surface coverage defined by the following formula (2) of at least one surface of 40% or more.
- Surface coverage (%) [(surface area) ⁇ (area of pores existing on the surface)] / (surface area) ⁇ 100 (2)
- the resin foam sheet is preferably formed by foaming the resin composition and further heat-melting the surface.
- the present invention provides a resin foam composite having an adhesive layer on at least one surface side of the resin foam sheet.
- the resin foam sheet of the present invention has the above configuration, the apparent density is low, and it is thin and flexible. Moreover, it is excellent in winding stability. Furthermore, high thickness accuracy can be obtained.
- FIG. 1 is a schematic diagram of a continuous slicing apparatus.
- FIG. 2 is a schematic view of a continuous processing apparatus having a heating roll.
- the resin foam sheet of the present invention is a resin foam sheet.
- the resin foam sheet of the present invention may be wound and may be in the form of a roll (rolled body).
- the apparent density is 0.03 to 0.30 g / cm 3
- the compressive stress at 50% compression is 5.0 N / cm 2 or less
- the thickness is 0.05 mm to 0.40 mm
- the “resin foam sheet having a length of 5 m or more and a width of 300 mm or more” may be referred to as “the long resin foam sheet of the present invention”.
- the thickness of the long resin foam sheet of the present invention is from 0.05 mm to 0.40 mm, preferably from 0.07 mm to 0.30 mm, more preferably from 0.10 mm to 0.25 mm. Since the said thickness is 0.05 mm or more, required intensity
- the thickness is measured at 10 points in the width direction from one end to the other end at one point in the length direction of the resin foam sheet, and further 1 m in the length direction from one point in the length direction.
- the thickness is measured every 10 mm in the width direction from one end to the other at the moved point, and is an average value of all the obtained measurement values.
- the width of the long resin foam sheet of the present invention is 300 mm or more (eg 300 to 1500 mm), preferably 400 mm or more (eg 400 to 1200 mm), more preferably 500 mm or more (eg 500 to 1000 mm). Since the said width
- the length of the long resin foam sheet of the present invention is 5 m or more (for example, 5 to 1000 m), preferably 30 m or more (for example, 30 to 500 m), more preferably 50 m or more (for example, 50 to 300 m).
- the apparent density (density) of the long resin foam sheet of the present invention is 0.03 to 0.30 g / cm 3 , more preferably 0.04 to 0.25 g / cm 3 , and still more preferably 0.05. ⁇ 0.20 g / cm 3 . Since the said apparent density is 0.03 g / cm ⁇ 3 > or more, intensity
- Compressive stress at 50% compression of the long resin foam sheet according to the present invention is 5.0 N / cm 2 or less, more preferably 4.0 N / cm 2 or less, more preferably 3.0 N / cm 2 or less It is.
- the compression stress at the time of 50% compression is 5.0 N / cm 2 or less, good flexibility can be obtained, and the repulsive force when compressed can be reduced, which is preferable.
- the compression stress at the time of 50% compression is measured based on JIS K 6767 by measuring the stress (N) when compressed by 50% of the initial thickness in the thickness direction of the resin foam sheet. It is determined by converting per unit area (cm 2 ).
- the tensile strength of the long resin foam sheet of the present invention is not particularly limited, but is preferably 0.5 MPa or more (for example, 0.5 to 15 MPa), more preferably 0.7 MPa or more (for example, 0.7 to 10 MPa). is there.
- the tensile strength is 0.5 MPa or more, the strength is excellent, and even when a force is applied in the length direction during production or use of the resin foam sheet, breakage and tearing are suppressed, which is preferable.
- the said tensile strength is the tensile strength of the length direction of a resin foam sheet, and is calculated
- the value obtained from the following formula (1) is preferably 25% or less, more preferably 15% or less, and further preferably 10% or less.
- Thickness tolerance The thickness is measured every 10 mm in the width direction from one end to the other at one point in the length direction, and one point at a point moved 1 m in the length direction from one point in the length direction. The thickness is measured every 10 mm in the width direction from the end to the other end, and the difference between the maximum value and the minimum value of all the measured values obtained.
- Median thickness Measured thickness every 10 mm in the width direction from one end to the other at one point in the length direction, and further moved 1 m in the length direction from one point in the length direction. The thickness is measured every 10 mm in the width direction from one end portion to the other end portion, and is a value located in the center when all the obtained measurement values are arranged in ascending order.
- the high speed during winding refers to a speed of 10 to 40 m / min, for example.
- the long resin foam sheet of the present invention suppresses the generation of wrinkles at the time of winding, particularly the generation of wrinkles at the time of high-speed winding, and obtains good winding stability and has high thickness accuracy. From the viewpoint of obtaining, it is preferable that at least one surface is a surface having a surface coverage of 40% or more. That is, the long resin foam sheet of the present invention preferably has a surface with a surface coverage of 40% or more.
- the surface coverage is preferably 40% or more, more preferably 45% or more, and even more preferably 50% or more from the viewpoint of obtaining better winding stability and higher thickness accuracy. It is.
- the surface coverage is an index indicating the ratio of non-porous parts existing on the surface (parts that are not holes existing on the surface, bulk, non-foamed part), and is defined by the following formula (2). If the surface coverage is 100%, there will be no holes on the surface.
- Surface coverage (%) [(surface area) ⁇ (area of pores existing on the surface)] / (surface area) ⁇ 100 (2)
- the long resin foam sheet of the present invention is not particularly limited, but is preferably formed by foaming a resin composition containing a resin. Especially, it is preferable to form by foaming the polyolefin resin composition containing polyolefin resin. That is, the long resin foam sheet of the present invention is preferably a long polyolefin resin foam sheet.
- the above resin composition may contain other components and additives. Moreover, the said resin, said other component, said additive, etc. may be used individually or in combination of 2 or more types.
- the resin content in the resin composition is not particularly limited, but is preferably 50% by weight or more, more preferably 60% by weight or more based on the total amount of the resin composition (100% by weight).
- the cell structure (cell structure) of the long resin foam sheet of the present invention is not particularly limited, but is a closed cell structure, 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), and a semi-continuous and semi-closed cell structure is more preferable.
- the ratio of the closed cell structure part of the long resin foam sheet of this invention is not specifically limited, 40 points with respect to the whole volume (100%) of the long resin foam sheet of this invention from a softness
- the cell structure can be controlled, for example, by adjusting the expansion ratio by the amount and pressure of the foaming agent impregnated in the resin composition during foam molding.
- the average cell diameter (average cell diameter) in the cell structure of the long resin foam sheet of the present invention is not particularly limited, but is preferably 10 to 150 ⁇ m, more preferably 30 to 120 ⁇ m, for example.
- the average cell diameter of the foam is 10 ⁇ m or more, impact absorbability (cushioning property) is improved.
- the average cell diameter of the foam is 150 ⁇ m or less, the foam has fine cells. Furthermore, it can be used for minute clearances, and dustproofness is further improved.
- the polyolefin resin contained in the polyolefin resin composition is not particularly limited, but is a polymer composed (formed) of ⁇ -olefin as an essential monomer component, that is, at least in a molecule (in one molecule).
- a polymer having a structural unit derived from an ⁇ -olefin is preferred.
- the polyolefin resin may be, for example, a polymer composed only of ⁇ -olefin or a polymer composed of ⁇ -olefin and monomer components other than ⁇ -olefin.
- the polyolefin resin may be a homopolymer (homopolymer) or a copolymer (copolymer) containing two or more monomers.
- the polyolefin resin may be a random copolymer or a block copolymer.
- One type of polymer may be sufficient as the said polyolefin resin, and what combined 2 or more types of polymers may be sufficient as it.
- the polyolefin resin is not particularly limited, but is preferably a linear polyolefin from the viewpoint of obtaining a polyolefin resin foam having a high expansion ratio.
- ⁇ -olefins examples include ⁇ -olefins having 2 to 8 carbon atoms (for example, ethylene, propylene, butene-1, pentene-1, hexene-1, 4-methyl-pentene-1, heptene-1, Octene-1).
- the ⁇ -olefin may be used alone or in combination of two or more.
- monomer components other than the ⁇ -olefin examples include ethylenically unsaturated monomers such as vinyl acetate, acrylic acid, acrylic acid ester, methacrylic acid, methacrylic acid ester, and vinyl alcohol.
- Monomer components other than ⁇ -olefin may be used alone or in combination of two or more.
- polystyrene resin examples include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene (propylene homopolymer), a copolymer of ethylene and propylene, and ⁇ - other than ethylene and ethylene.
- Copolymers of olefins, copolymers of propylene and ⁇ -olefins other than propylene, copolymers of ethylene and propylene and ethylene and ⁇ -olefins other than propylene, propylene and ethylenically unsaturated monomers A copolymer etc. are mentioned.
- the polyolefin resin is preferably a polymer composed of propylene as an essential monomer component (polypropylene polymer), that is, a polymer having at least a structural unit derived from propylene.
- examples of the polyolefin resin include polypropylene polymers such as polypropylene (propylene homopolymer), a copolymer of ethylene and propylene, and a copolymer of propylene and an ⁇ -olefin other than propylene.
- the ⁇ -olefins other than propylene may be used alone or in combination of two or more.
- the content of the ⁇ -olefin is not particularly limited, but is preferably 0.1 to 10% by weight, more preferably 1 to 10% by weight with respect to the total amount of monomer components (100% by weight) constituting the polyolefin resin. 5% by weight.
- the polyolefin resin composition may contain “rubber and / or thermoplastic elastomer” as other components.
- the rubber is not particularly limited, and examples thereof include natural or synthetic rubber such as natural rubber, polyisobutylene, isoprene rubber, chloroprene rubber, butyl rubber, and nitrile butyl rubber.
- gum may be used individually or in combination of 2 or more types.
- thermoplastic elastomer is not particularly limited.
- thermoplastics such as ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene-vinyl acetate copolymer, polybutene, polyisobutylene, chlorinated polyethylene, etc.
- thermoplastic styrene-based elastomers such as styrene-butadiene-styrene copolymers, styrene-isoprene-styrene copolymers, styrene-isoprene-butadiene-styrene copolymers, and hydrogenated polymers thereof; thermoplastic polyesters Elastomers; thermoplastic polyurethane elastomers; thermoplastic acrylic elastomers and the like.
- the said thermoplastic elastomer may be used individually or in combination of 2 or more types.
- the content of the “rubber and / or thermoplastic elastomer” in the polyolefin resin composition is not particularly limited, but is 0 to 70% by weight with respect to the total amount (100% by weight) of the polyolefin resin composition. It is preferably 20 to 60% by weight, more preferably 20 to 50% by weight.
- the polyolefin-based resin composition may include “a mixture (composition) containing a rubber and / or a thermoplastic elastomer and a softening agent” as other components in addition to the polyolefin-based resin.
- a mixture (composition) containing a rubber and / or a thermoplastic elastomer and a softening agent as other components in addition to the polyolefin-based resin.
- the above-mentioned “mixture (composition) containing rubber and / or thermoplastic elastomer and softener” may contain additives as necessary.
- Examples of the “mixture (composition) containing rubber and / or thermoplastic elastomer and softening agent” include, for example, a mixture containing at least rubber, a thermoplastic elastomer and a softening agent, a mixture containing at least rubber and a softening agent, Examples thereof include a mixture containing at least a thermoplastic elastomer and a softening agent.
- a mixture composed of only rubber and / or thermoplastic elastomer and softener” is preferable.
- the rubber in the “mixture containing a rubber and / or thermoplastic elastomer and a softening agent” is not particularly limited, but the rubber exemplified as the rubber of the “rubber and / or thermoplastic elastomer” is preferably exemplified. In addition, this rubber
- gum may be used individually or in combination of 2 or more types.
- the rubber and / or thermoplastic elastomer in the above-mentioned “rubber and / or thermoplastic elastomer and mixture containing softener” is not particularly limited as long as it can be foamed. And / or thermoplastic elastomer ”.
- the thermoplastic elastomer exemplified as the thermoplastic elastomer of the “rubber and / or thermoplastic elastomer” is preferable.
- this thermoplastic elastomer may be used individually or in combination of 2 or more types.
- the “rubber and / or thermoplastic elastomer” in the “mixture containing rubber and / or thermoplastic elastomer and softener” is preferably an olefin-based elastomer, particularly preferably a polyolefin component and an olefin-based rubber component. It is an olefin-based elastomer having a separated structure. Examples of the olefin elastomer having a structure in which the polyolefin component and the olefin rubber component are microphase-separated include an elastomer comprising polypropylene resin (PP) and ethylene-propylene rubber (EPM) or ethylene-propylene-diene rubber (EPDM).
- PP polypropylene resin
- EPM ethylene-propylene rubber
- EPDM ethylene-propylene-diene rubber
- the above-mentioned softener is not particularly limited, but a softener generally used for rubber products is preferable. By containing the softening agent, processability and flexibility can be improved.
- the softener include petroleum oils such as process oil, lubricating oil, paraffin, liquid paraffin, petroleum asphalt and petroleum jelly; coal tars such as coal tar and coal tar pitch; castor oil, linseed oil and rapeseed oil Fatty oils such as soybean oil and coconut oil; waxes such as tall oil, beeswax, carnauba wax and lanolin; synthetic polymer substances such as petroleum resin, coumarone indene resin and atactic polypropylene; dioctyl phthalate, dioctyl adipate, dioctyl Examples thereof include ester compounds such as sebacate; microcrystalline wax, sub (factis), liquid polybutadiene, modified liquid polybutadiene, liquid thiocol, liquid polyisoprene, liquid polybutene, and liquid ethylene / ⁇ -olefin copolymer.
- petroleum oils such as process oil, lubricating oil, paraffin, liquid paraffin, petroleum asphalt and petroleum jelly
- paraffinic, naphthenic and aromatic mineral oils, liquid polyisoprene, liquid polybutene, and liquid ethylene / ⁇ -olefin copolymers are preferable, and liquid polyisoprene, liquid polybutene, and liquid ethylene / ⁇ - ⁇ are more preferable. It is an olefin copolymer.
- the content of the softening agent in the “mixture containing rubber and / or thermoplastic elastomer and softening agent” is not particularly limited, but is preferably 1 to 200 parts by weight with respect to 100 parts by weight of the polyolefin component.
- the amount is preferably 5 to 100 parts by mass, more preferably 10 to 50 parts by mass.
- distribution defect may arise at the time of kneading
- the additive in the above-mentioned “mixture containing rubber and / or thermoplastic elastomer and softener” is not particularly limited.
- anti-aging agent weathering agent, ultraviolet absorber, dispersant, plasticizer, carbon black
- examples thereof include an antistatic agent, a surfactant, a tension modifier, and a fluidity modifier.
- such an additive may be used individually or in combination of 2 or more types.
- the content of the additive in the “mixture containing rubber and / or thermoplastic elastomer and softener” is not particularly limited.
- 0.01 to 100 parts by mass with respect to 100 parts by mass of the polyolefin component Part is preferable, more preferably 0.05 to 50 parts by weight, still more preferably 0.1 to 30 parts by weight.
- melt flow rate (MFR) (230 ° C.) of the above “mixture containing rubber and / or thermoplastic elastomer and softener” is not particularly limited, but is 3 to 10 g / 10 min from the viewpoint of obtaining good moldability. And more preferably 4 to 9 g / 10 min.
- the “JIS A hardness” in the “mixture containing rubber and / or thermoplastic elastomer and softener” is not particularly limited, but is preferably 30 to 90 °, more preferably 40 to 85 °.
- the “JIS A hardness” is 30 ° or more, a resin foam having a high expansion ratio is easily obtained, which is preferable.
- the “JIS A hardness” is 90 ° or less because a flexible resin foam is easily obtained.
- the “JIS A hardness” in this specification refers to the hardness measured based on ISO7619 (JIS K6253).
- the polyolefin-based resin composition may contain an additive as long as the effects of the present invention are not impaired.
- the additives include cell nucleating agents, crystal nucleating agents, plasticizers, lubricants, colorants (pigments, dyes, etc.), ultraviolet absorbers, antioxidants, anti-aging agents, fillers, reinforcing agents, and antistatic agents.
- the said additive may be used individually or in combination of 2 or more types.
- the polyolefin-based resin composition contains a cell nucleating agent. It is preferable.
- Examples of the bubble nucleating agent include particles.
- Examples of the particles include talc, silica, alumina, zeolite, calcium carbonate, magnesium carbonate, barium sulfate, zinc oxide, titanium oxide, aluminum hydroxide, magnesium hydroxide, mica, montmorillonite and other clays, carbon particles, and glass fibers. And carbon tubes.
- grains may be used individually or in combination of 2 or more types.
- the content of the cell nucleating agent in the polyolefin resin composition is not particularly limited, but is preferably 0.5 to 125 parts by weight, more preferably 1 to 120 parts, relative to 100 parts by weight of the polyolefin resin. Parts by weight.
- the average particle size (particle size) of the particles is not particularly limited, but is preferably 0.1 to 20 ⁇ m. If the average particle size is less than 0.1 ⁇ m, it may not function as a foam nucleating agent. On the other hand, if the particle size exceeds 20 ⁇ m, it may cause outgassing during foam molding.
- the resin foam becomes flame retardant and can be used for applications requiring flame resistance such as electrical or electronic equipment.
- a flame retardant may be included in the polyolefin-based resin composition.
- the flame retardant may be in the form of powder or may be in a form other than powder.
- an inorganic flame retardant is preferable.
- the inorganic flame retardant include bromine-based flame retardant, chlorine-based flame retardant, phosphorus-based flame retardant, antimony-based flame retardant, and non-halogen-non-antimony-based inorganic flame retardant.
- chlorinated flame retardants and brominated flame retardants generate gas components that are harmful to the human body and corrosive to equipment during combustion
- phosphorous flame retardants and antimony flame retardants are There are problems such as toxicity and explosiveness.
- a non-halogen-nonantimony inorganic flame retardant is preferable.
- the non-halogen-nonantimony inorganic flame retardant include hydrated metal compounds such as aluminum hydroxide, magnesium hydroxide, magnesium oxide / nickel oxide hydrate, magnesium oxide / zinc oxide hydrate, and the like. .
- the hydrated metal oxide may be surface treated.
- a flame retardant may be used individually or in combination of 2 or more types.
- the above flame retardant preferably has a function as a cell nucleating agent from the viewpoint of obtaining a polyolefin resin foam having flame retardancy and a high expansion ratio.
- Examples of the flame retardant having a function as a cell nucleating agent include magnesium hydroxide and aluminum hydroxide.
- the content of the flame retardant in the polyolefin resin composition is not particularly limited, but is preferably 30 to 150 parts by weight, more preferably 60 to 120 parts by weight with respect to 100 parts by weight of the polyolefin resin. is there.
- the polyolefin-based resin composition may contain a lubricant.
- the lubricant is not particularly limited.
- hydrocarbon lubricants such as liquid paraffin, paraffin wax, microwax and polyethylene wax
- fatty acid lubricants such as stearic acid, behenic acid and 12-hydroxystearic acid
- butyl stearate Ester-based lubricants such as stearic acid monoglyceride, pentaerythritol tetrastearate, hydrogenated castor oil, stearyl stearate, and the like.
- a lubricant may be used alone or in combination of two or more.
- the content of the lubricant in the polyolefin resin composition is not particularly limited, but is preferably 0.1 to 10 parts by weight, more preferably 0.5 to 5 parts by weight based on 100 parts by weight of the polyolefin resin. Parts by weight.
- the polyolefin resin composition is not particularly limited, but may be prepared by kneading the polyolefin resin, other components as necessary, and additives added as necessary. Alternatively, it may be obtained by kneading and extruding with a known melt-kneading extruder such as a uniaxial (single-axis) kneading extruder or a biaxial kneading extruder.
- a known melt-kneading extruder such as a uniaxial (single-axis) kneading extruder or a biaxial kneading extruder.
- the shape of the polyolefin-based resin composition is not particularly limited, and examples thereof include a strand shape, a sheet shape, a flat plate shape, and a pellet shape in which the strand is cooled with water or air and cut into an appropriate length. Especially, it is preferable to knead
- the long resin foam sheet of the present invention is not particularly limited, but is preferably formed by foaming the resin composition (for example, the polyolefin resin composition). In particular, it is preferably formed by foaming the resin composition (for example, the polyolefin resin composition) and then subjecting the surface to heat melting treatment.
- the method of foaming the resin composition is not particularly limited, and examples thereof include a physical foaming method and a chemical foaming method.
- the physical foaming method is a method of forming cells (bubbles) by impregnating (dispersing) a low boiling point liquid (foaming agent) in a resin composition and then volatilizing the foaming agent.
- the said chemical foaming method is a method of forming a cell with the gas produced by the thermal decomposition of the compound added to the resin composition.
- the physical foaming method is preferable from the viewpoint of avoiding contamination of the resin foam sheet and the ease of obtaining a fine and uniform cell structure, and the physical foaming method using a high-pressure gas as a foaming agent is more preferable. Therefore, the long resin foam sheet of the present invention is particularly preferably formed by impregnating the polyolefin resin composition with a high-pressure gas (for example, an inert gas described later) and then foaming. .
- a high-pressure gas for example, an inert gas described later
- gas is preferable, especially resin (resin which comprises a resin foam sheet (A gas (inert gas) inert to the resin contained in the resin composition, such as the polyolefin resin, is preferable.
- the inert gas is not particularly limited, and examples thereof include carbon dioxide, nitrogen gas, air, helium, and argon.
- the inert gas is preferably carbon dioxide from the viewpoint of a large amount of impregnation into the resin composition and a high impregnation rate.
- the said inert gas may be used individually or in combination of 2 or more types.
- the mixing amount (content, impregnation amount) of the foaming agent is not particularly limited, but is preferably 2 to 10% by weight with respect to the total weight (100% by weight) of the resin composition.
- the above inert gas is preferably in a supercritical state at the time of impregnation from the viewpoint of increasing the impregnation rate into the resin composition. That is, the long resin foam sheet of the present invention is preferably formed by foaming the resin composition (for example, the polyolefin resin composition) using a supercritical fluid.
- the inert gas is a supercritical fluid (supercritical state)
- the solubility in the resin composition increases and high concentration impregnation (mixing) is possible.
- the pressure is drastically lowered after the impregnation, 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.
- a step of impregnating a resin composition with a high-pressure gas for example, an inert gas
- reducing the pressure for example, to atmospheric pressure
- the method of forming by foaming through is preferable.
- an unfoamed molded product is obtained by molding a resin composition, and the non-foamed molded product is impregnated with a high-pressure gas and then foamed through a process of reducing pressure (for example, up to atmospheric pressure).
- the resin composition for example, the polyolefin resin composition
- the unfoamed resin molded body may be impregnated with a high-pressure gas and foamed by releasing the pressure, and the resin composition may be subjected to a high-pressure condition. Then, it may be kneaded with a high-pressure gas, and may be molded in a continuous manner in which pressure is released and molding and foaming are performed simultaneously.
- the method for forming the unfoamed resin molded body is not particularly limited.
- the resin composition is molded using an extruder such as a single screw extruder or a twin screw extruder; A method in which a product is uniformly kneaded using a kneader equipped with blades such as a roller, a cam, a kneader, a banbari type, and press-molded to a predetermined thickness using a hot plate press; resin composition The method etc. which shape
- the shape of the unfoamed resin molded body is not particularly limited, and examples thereof include a sheet shape, a roll shape, and a plate shape.
- the resin composition is molded by an appropriate method for obtaining an unfoamed resin molded body having a desired shape and thickness.
- a non-foamed resin molded product is placed in a pressure-resistant container, a high-pressure gas is injected (introduced and mixed), and the non-foamed resin molded product is impregnated with gas.
- the pressure is released, the pressure is released (usually up to atmospheric pressure), and a bubble structure is formed through a decompression step that generates bubble nuclei in the resin composition.
- a high-pressure gas is injected (introduced and mixed) while kneading the resin composition using an extruder (for example, a single screw extruder, a twin screw extruder, etc.) or an injection molding machine.
- the resin composition is impregnated with a sufficiently high pressure gas, and the pressure is released by pushing the resin composition through a die provided at the tip of the extruder (usually up to atmospheric pressure), molding and foaming.
- the resin composition is foam-molded by a molding decompression step that is simultaneously performed.
- a heating step for growing bubble nuclei by heating may be provided as necessary.
- bubble nuclei may be grown at room temperature without providing a heating step.
- the shape may be fixed rapidly by cooling with cold water or the like.
- the high-pressure gas may be introduced continuously or discontinuously.
- the heating method for growing the cell nuclei is not particularly limited, and examples thereof include known or conventional methods such as a water bath, an oil bath, a hot roll, a hot air oven, far infrared rays, near infrared rays, and microwaves.
- the pressure when impregnating the gas is appropriately selected in consideration of the type of gas, operability, etc., for example, 5 MPa or more (for example, 5 to 100 MPa), more preferably 7 MPa or more (for example, 7 to 100 MPa). That is, the resin composition is preferably impregnated with a gas having a pressure of 5 MPa or more (for example, a pressure of 5 to 100 MPa), and more preferably impregnated with an inert gas having a pressure of 7 MPa or more (for example, a pressure of 7 to 100 MPa). .
- the gas pressure is lower than 5 MPa
- the bubble growth at the time of foaming is remarkable, the cell becomes too large, and disadvantages such as a decrease in the dustproof effect are likely to occur, which is not preferable.
- the pressure is low, the amount of impregnation of the gas is relatively small compared to when the pressure is high, and the number of bubble nuclei formed by decreasing the bubble nucleus formation rate is reduced. This is because the bubble diameter is extremely increased.
- the cell diameter and the bubble density are greatly changed only by slightly changing the impregnation pressure, so that it is difficult to control the cell diameter and the bubble density.
- the temperature at which the gas is impregnated varies depending on the type of gas and resin used and can be selected in a wide range. In consideration of the above, it is preferably 10 to 350 ° C. More specifically, the impregnation temperature in the batch method is preferably 10 to 250 ° C, more preferably 40 to 240 ° C, and further preferably 60 to 230 ° C. In the continuous method, the impregnation temperature is preferably 60 to 350 ° C, more preferably 100 to 320 ° C, and further 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 resin composition impregnated with the gas may be cooled to a temperature suitable for foam molding (for example, 150 to 190 ° C.).
- the pressure reduction rate in the pressure reduction step is not particularly limited, but is preferably 5 to 300 MPa from the viewpoint of obtaining a cell structure having uniform and fine cells. / Sec.
- the heating temperature is preferably 40 to 250 ° C., more preferably 60 to 250 ° C., for example.
- the cell structure, density, and relative density of the long resin foam sheet of the present invention are determined according to the foaming method and foaming conditions (for example, the foaming agent) when foaming the resin composition according to the type of resin to be formed. It is adjusted by selecting the type, amount, foaming temperature, pressure, time, etc.
- the long resin foam sheet of the present invention is formed by foaming the resin composition and further heat-melting the surface. More specifically, it is preferably formed by foaming the resin composition to obtain a foam (sheet-like foam), and then subjecting the surface of the foam to heat melting treatment. In this way, by melting the surface in the thickness direction, the tensile strength in the length direction is increased while minimizing the decrease in flexibility, and the occurrence of breakage and tearing is suppressed. Resin foam sheets can be obtained easily and continuously, and the foamed part returns to the non-foamed state (bulk), reducing the original surface roughness (thickness error) and increasing the thickness accuracy.
- a sheet-like foam obtained by foaming the resin composition and before the heat-melting treatment may be referred to as a “foam structure”.
- the heating and melting treatment is not particularly limited, but the above-mentioned “value obtained from the formula (1)” and the surface coverage are adjusted to generate wrinkles during winding, particularly wrinkles during winding at high speed.
- the foaming structure is generally applied to at least one surface. That is, when the long resin foam sheet of the present invention is formed by foaming the resin composition and further heat-melting the surface, the foamed structure is obtained by foaming the resin composition. After being obtained, it is preferable to form the foamed structure by subjecting one or both sides of the foam structure to a heat melting treatment. In addition, the same surface may be heat-melted twice or more.
- the heating and melting treatment is not particularly limited, and examples thereof include a press treatment using a hot roll, a laser irradiation treatment, a contact melting treatment on a heated roll, and a flame treatment.
- the treatment can be suitably performed using a thermal laminator or the like.
- the material of the roll include rubber, metal, and fluorine-based resin (for example, Teflon (registered trademark)).
- the temperature at the time of the heat-melting treatment is not particularly limited, but is a temperature that is 15 ° C. lower than the softening point or melting point of a resin (for example, the polyolefin-based resin or the like) contained in the resin foam sheet (more preferably, the resin foam sheet). Or higher than the softening point or melting point of the resin contained in the resin foam sheet, and 20 ° C. higher than the softening point or melting point of the resin contained in the resin foam sheet (more preferably in the resin foam sheet).
- the temperature is preferably 10 ° C. or higher than the softening point or melting point of the resin contained.
- the temperature during the heat-melt treatment is higher than the softening point or the melting point of the resin that is 15 ° C. lower than the melting point because the heat-melt treatment can be performed efficiently.
- the temperature at the time of heat-melting treatment is lower than a temperature that is 20 ° C. higher than the softening point or melting point of the constituent resin, which can suppress shrinkage and generation of wrinkles.
- the treatment time of the heat-melting treatment is preferably about 0.1 seconds to 10 seconds, and preferably about 0.5 seconds to 7 seconds, although it depends on the treatment temperature. If the time is too short, melting may not proceed, and if the time is too long, shrinkage may cause wrinkles.
- the heating and melting treatment adjusts the above-mentioned “value obtained from the formula (1)” and the surface coverage to generate wrinkles during winding, particularly wrinkles during high-speed winding. It is preferable to use a heating and melting apparatus capable of adjusting a gap (gap, interval) through which the foam structure passes, in order to suppress and obtain better winding stability and to further improve the thickness accuracy.
- thermo dielectric roll a heating roll capable of adjusting the gap in FIG.
- the long resin foam sheet of the present invention has a low apparent density, is thin and flexible, and has excellent stability during winding (winding stability). For this reason, a wide and long long roll can be obtained. Moreover, the long resin foam sheet
- the long resin foam sheet of the present invention is used for dustproof materials, seal materials (foam seal materials), soundproof materials, cushioning materials, etc. used when attaching (attaching) various members or parts to predetermined sites. Preferably used.
- the long resin foam sheet of this invention may be processed into various shapes according to a use.
- the resin foam composite of the present invention includes at least the long resin foam sheet of the present invention.
- the resin foam composite of the present invention preferably has a configuration in which the long resin foam sheet of the present invention and other layers are laminated.
- the shape of the resin foam composite of this invention is not specifically limited, A sheet form (film form) and a roll form are preferable. Moreover, you may process into various shapes according to a use.
- the other layers may be provided only on one side of the long resin foam sheet of the present invention, or may be provided on both sides. In addition, at least one other layer is provided. Furthermore, the other layer may be a single layer or a laminate composed of a plurality of layers.
- Examples of the other layers include a pressure-sensitive adhesive layer, an intermediate layer (for example, an undercoat layer that improves adhesion), a base material layer (for example, a film layer, a nonwoven fabric layer, and the like).
- an adhesive layer is preferable. That is, the resin foam composite of the present invention preferably has an adhesive layer on at least one surface side of the long resin foam sheet of the present invention. Having an adhesive layer is advantageous for fixing to the adherend and temporary fixing, and is advantageous in terms of assembly. Further, a processing mount can be provided on the resin foam sheet via an adhesive layer.
- an adhesive which comprises the said adhesive layer For example, an acrylic adhesive, rubber adhesives (a natural rubber adhesive, a synthetic rubber adhesive, etc.), a silicone adhesive, polyester type 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.
- the pressure-sensitive adhesives may be used alone or in combination of two or more.
- 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-based pressure-sensitive adhesive.
- 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 be a single layer or a laminate.
- the pressure-sensitive adhesive layer may be formed on at least one surface side of the long resin foam sheet of the present invention via at least one lower layer.
- a lower layer include a pressure-sensitive adhesive layer other than the pressure-sensitive adhesive layer, an intermediate layer, an undercoat layer, and a base material layer.
- a base material layer is preferable from the viewpoint of improvement in breaking strength, and a film layer such as a plastic film layer and a nonwoven fabric layer are particularly preferable.
- the long resin foam sheet of the present invention or the resin foam composite of the present invention is not particularly limited, it is preferably used for attaching (attaching) various members or parts to a predetermined site.
- it is suitably used when attaching (attaching) a component constituting the electrical or electronic device to a predetermined part. That is, the resin foam sheet of the present invention and the resin foam composite of the present invention are preferably for electrical or electronic equipment.
- various members or parts are not particularly limited, but for example, various members or parts in electrical or electronic devices are preferably mentioned.
- 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 long resin foam sheet of the present invention or the resin foam composite of the present invention is used around the display part of an LCD (liquid crystal display) or the like for the purpose of dust prevention, light shielding, buffering, etc. It can be used by being sandwiched between a display section such as a display) and a housing (window section).
- LCD liquid crystal display
- the long resin foam sheet of the present invention is thin and flexible, and can further increase the thickness accuracy. Therefore, the long resin foam sheet of the present invention or the resin foam composite of the present invention is mounted with a touch panel. Even when used in an electric or electronic device in which a large number of components and members such as a smartphone are stacked, a high repulsive force is not generated, and display defects such as liquid crystal display unevenness of the display unit are not caused.
- Example 1 By passing the resin foam A through the continuous processing apparatus in which the temperature of the induction heating roll is set to 160 ° C. and the gap is set to 0.20 mm, one side is melt-processed with heat, slitted, and then wound. Then, a resin foam sheet whose one surface was heat-melted was obtained. The take-up speed was 20 m / min.
- Example 2 By passing the resin foam B through the continuous processing apparatus in which the temperature of the induction heating roll is set to 160 ° C. and the gap is set to 0.30 mm, one side is melt-processed with heat, slitted, and then wound. Then, a resin foam sheet whose one surface was heat-melted was obtained. The take-up speed was 20 m / min.
- Example 3 By passing the resin foam A through the continuous processing apparatus in which the temperature of the induction heating roll is set to 160 ° C. and the gap is set to 0.20 mm, one side is melt-processed with heat, slitted, and then wound. A wound body was obtained. The take-up speed was 20 m / min. Next, the wound body is rewound, and is passed through the continuous processing apparatus in which the temperature of the induction heating roll is set to 160 ° C. and the gap is set to 0.10 mm. Surface) was melt-processed with heat, slitted, and then wound up to obtain a resin foam sheet on which both surfaces were heat-melted. The take-up speed was 20 m / min.
- Example 4 The resin foam B is unwound and passed through the continuous processing apparatus in which the temperature of the induction heating roll is set to 160 ° C. and the gap is set to 0.30 mm. Then, it was wound up to obtain a wound body. The take-up speed was 20 m / min. Next, the wound body is rewound and passed through the continuous processing apparatus in which the temperature of the induction heating roll is set to 160 ° C. and the gap is set to 0.20 mm, so that the surface not melted (untreated) Surface) was melt-processed with heat, slitted, and then wound up to obtain a resin foam sheet on which both surfaces were heat-melted. The take-up speed was 20 m / min.
- Example 5 By passing the resin foam A through the continuous processing apparatus in which the temperature of the induction heating roll is set to 160 ° C. and the gap is set to 0.25 mm, one surface is melt-processed with heat, wound up, and wound. Got. The take-up speed was 20 m / min. Next, the wound body is unwound, and the surface of the melt-treated surface is melted by heat by passing through the continuous processing apparatus in which the temperature of the induction heating roll is set to 160 ° C. and the gap is set to 0.20 mm. The resin foam sheet which processed and slit-processed and wound up after that and the same surface was heat-melted twice was obtained. The take-up speed was 20 m / min.
- Example 6 By passing the resin foam A through the continuous processing apparatus in which the temperature of the induction heating roll is set to 160 ° C. and the gap is set to 0.20 mm, one surface is melt-processed with heat, wound up, and wound. Got. The take-up speed was 20 m / min. Next, the wound body is rewound, and the surface of the melting treatment is melted with heat by passing through the continuous processing apparatus in which the temperature of the induction heating roll is set to 160 ° C. and the gap is set to 0.13 mm. The resin foam sheet which processed and slit-processed and wound up after that and the same surface was heat-melted twice was obtained. The take-up speed was 20 m / min.
- a sample for measurement was obtained by punching from a resin foam sheet with a punching blade die having a width of 40 mm and a length of 40 mm. And the apparent density (g / cm ⁇ 3 >) was calculated
- the thickness is measured every 10 mm in the width direction from one end portion to the other end portion, and further, 1 m in the length direction is moved from one point in the length direction. The thickness was measured every 10 mm in the width direction from one end to the other end, and the average value, maximum value, and minimum value were determined from all the measured values.
- a 1/100 dial gauge having a measurement terminal diameter ( ⁇ ) of 20 mm was used. The average value of the measured values was defined as the “thickness” (mm) of the resin foam sheet.
- the thickness accuracy was obtained from the following formula (3).
- the target value is a target thickness value (target thickness value, target thickness value).
- target value of Example 1 is 0.20 mm which is the size of the set gap
- target value of Example 3 is 0.10 mm which is the size of the finally set gap.
- Thickness accuracy (%) [(thickness tolerance) / 2] / (target value) ⁇ 100 (3)
- the resin foam sheet and the resin foam composite of the present invention are used for applications such as a dustproof material, a seal material, a soundproof material, and a cushioning material used when various members or parts are attached to a predetermined part.
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Abstract
Description
(厚み公差)/(厚みの中心値)×100 (1)
厚み公差:長さ方向の1点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、さらに上記長さ方向の1点から長さ方向に1m移動した点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、得られた全ての測定値の最大値と最小値の差をいう。
厚みの中心値:長さ方向の1点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、さらに上記長さ方向の1点から長さ方向に1m移動した点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、得られた全ての測定値を小さい順に並べたとき中央に位置する値をいう。
表面被覆率(%)=[(表面の面積)-(表面に存在する孔の面積)]/(表面の面積)×100 (2)
本発明の樹脂発泡体シートは、樹脂発泡体のシート状物である。本発明の樹脂発泡体シートは、巻き取られ、ロール状(巻回体)であってもよい。なお、本明細書において、「見掛け密度が0.03~0.30g/cm3、50%圧縮時の圧縮応力が5.0N/cm2以下、厚みが0.05mm以上0.40mm以下、長さが5m以上、幅が300mm以上である樹脂発泡体シート」を「本発明の長尺樹脂発泡体シート」と称する場合がある。
(厚み公差)/(厚みの中心値)×100 (1)
厚み公差:長さ方向の1点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、さらに上記長さ方向の1点から長さ方向に1m移動した点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、得られた全ての測定値の最大値と最小値の差をいう。
厚みの中心値:長さ方向の1点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、さらに上記長さ方向の1点から長さ方向に1m移動した点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、得られた全ての測定値を小さい順に並べたとき中央に位置する値をいう。
表面被覆率(%)=[(表面の面積)-(表面に存在する孔の面積)]/(表面の面積)×100 (2)
本発明の樹脂発泡複合体は、本発明の長尺樹脂発泡体シートを少なくとも含む。本発明の樹脂発泡複合体は、本発明の長尺樹脂発泡体シートと他の層とが積層された構成であることが好ましい。なお、本発明の樹脂発泡複合体の形状は、特に限定されないが、シート状(フィルム状)、ロール状が好ましい。また、用途に応じて種々の形状に加工されていてもよい。
ポリプロピレン[メルトフローレート(MFR):0.35g/10min]:45重量部、ポリオレフィン系エラストマーと軟化剤(パラフィン系伸展油)の混合物(MFR(230℃):6g/10分、JIS A硬度:79°、軟化剤をポリオレフィン系エラストマー100質量部に対して30質量部配合):55重量部、水酸化マグネシウム:10重量部、カーボン(商品名「旭♯35」旭カーボン株式会社製):10重量部、ステアリン酸モノグリセリド:1重量部、及び脂肪酸アミド(ラウリン酸ビスアミド):1.5重量部を、日本製鋼所(JSW)社製の二軸混練機にて、200℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に成形した。このペレットを、日本製鋼所社製の単軸押出機に投入し、220℃の雰囲気下、13(注入後12)MPaの圧力で、二酸化炭素ガスを注入した。二酸化炭素ガスは、ペレット全量に対して5.6重量%の割合で注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから円筒状に押出して、発泡体の内側表面を冷却するマンドレルと、押出機の環状ダイから押し出された円筒状の発泡体の外側表面を冷却する発泡体冷却用エアリングの間を通過させ、直径の一部を切断してシート状に展開して長尺発泡体原反を得た。この長尺発泡体原反において、平均セル径は55μm、見掛け密度は0.041g/cm3であった。
この長尺発泡体原反を所定の幅に切断し(スリット加工)、図1に示すような連続スライス装置(スライスライン)を用いて、1面ずつ表面の低発泡層を剥がしとり、樹脂発泡体A及び樹脂発泡体Bを得た。
樹脂発泡体A:厚み0.30mm、幅550mm
樹脂発泡体B:厚み0.40mm、幅550mm
上記樹脂発泡体Aを、誘導発熱ロールの温度を160℃、ギャップを0.20mmにセットした上記連続処理装置内を通過させることにより、片面を熱で溶融処理して、スリット加工し、その後巻き取って、片面が熱溶融処理された樹脂発泡体シートを得た。なお、引き取り速度は、20m/minとした。
上記樹脂発泡体Bを、誘導発熱ロールの温度を160℃、ギャップを0.30mmにセットした上記連続処理装置内を通過させることにより、片面を熱で溶融処理して、スリット加工し、その後巻き取って、片面が熱溶融処理された樹脂発泡体シートを得た。なお、引き取り速度は、20m/minとした。
上記樹脂発泡体Aを、誘導発熱ロールの温度を160℃、ギャップを0.20mmにセットした上記連続処理装置内を通過させることにより、片面を熱で溶融処理して、スリット加工し、その後巻き取って、巻回体を得た。なお、引き取り速度は、20m/minとした。
次に、上記巻回体を巻き戻して、誘導発熱ロールの温度を160℃、ギャップを0.10mmにセットした上記連続処理装置内を通過させることにより、溶融処理がされていない面(未処理面)を熱で溶融処理して、スリット加工し、その後巻き取って、両面が熱溶融処理された樹脂発泡体シートを得た。なお、引き取り速度は、20m/minとした。
上記樹脂発泡体Bを、巻き戻し、誘導発熱ロールの温度を160℃、ギャップを0.30mmにセットした上記連続処理装置内を通過させることにより、片面を熱で溶融処理して、スリット加工し、その後巻き取って、巻回体を得た。なお、引き取り速度は、20m/minとした。
次に、上記巻回体を巻き戻して、誘導発熱ロールの温度を160℃、ギャップを0.20mmにセットした上記連続処理装置内を通過させることにより、溶融処理がされていない面(未処理面)を熱で溶融処理して、スリット加工し、その後巻き取って、両面が熱溶融処理された樹脂発泡体シートを得た。なお、引き取り速度は、20m/minとした。
上記樹脂発泡体Aを、誘導発熱ロールの温度を160℃、ギャップを0.25mmにセットした上記連続処理装置内を通過させることにより、片面を熱で溶融処理し、巻き取って、巻回体を得た。なお、引き取り速度は、20m/minとした。
次に、上記巻回体を巻き戻して、誘導発熱ロールの温度を160℃、ギャップを0.20mmにセットした上記連続処理装置内を通過させることにより、先程、溶融処理した面を熱で溶融処理して、スリット加工し、その後巻き取って、同一面が2回熱溶融処理された樹脂発泡体シートを得た。なお、引き取り速度は、20m/minとした。
上記樹脂発泡体Aを、誘導発熱ロールの温度を160℃、ギャップを0.20mmにセットした上記連続処理装置内を通過させることにより、片面を熱で溶融処理し、巻き取って、巻回体を得た。なお、引き取り速度は、20m/minとした。
次に、上記巻回体を巻き戻して、誘導発熱ロールの温度を160℃、ギャップを0.13mmにセットした上記連続処理装置内を通過させることにより、先程、溶融処理した面を熱で溶融処理して、スリット加工し、その後巻き取って、同一面が2回熱溶融処理された樹脂発泡体シートを得た。なお、引き取り速度は、20m/minとした。
上記樹脂発泡体Aを、誘導発熱ロールの温度を30℃、ギャップを1.00mmにセットした上記連続処理装置内を通過させ、スリット加工し、その後巻き取って、樹脂発泡体シートを得た。なお、引き取り速度は、20m/minとした。
上記実施例及び上記比較例で得られた樹脂発泡体シートについて、下記の測定又は評価を行った。結果は表1に示した。
樹脂発泡体シートより、幅40mm×長さ40mmの打抜き刃型にて打抜き、測定用サンプルを得た。そして、上記測定用サンプルより、JIS K 6767に従って見かけ密度(g/cm3)を求めた。
具体的には、上記測定用サンプルの幅、長さを測定し、測定端子の直径(φ)20mmである1/100ダイヤルゲージにて測定用サンプルの厚さ(mm)を測定した。これらの測定値からポリオレフィン系樹脂発泡体の体積(cm3)を算出した。次に、測定用サンプルの重量(g)を、最小目盛り0.01g以上の上皿天秤にて測定した。上記の体積及び重量の測定値より、見かけ密度(g/cm3)を算出した。
JIS K 6767に基づいて、樹脂発泡体シートの厚み方向に初めの厚さの50%だけ圧縮したときの応力(N)を測定し、該応力を単位面積(cm2)当たりに換算して、50%圧縮時の反発応力(N/cm2)とした。
JIS K 6767の引張強さ及び伸びの項に基づいて、樹脂発泡体シートの長さ方向の引張強度(MPa)を測定した。
樹脂発泡体シートの長さ方向の1点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、さらに上記長さ方向の1点から長さ方向に1m移動した点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、得られた全ての測定値から、平均値、最大値、最小値を求めた。
厚みの測定の際には、測定端子の直径(φ)20mmである1/100ダイヤルゲージを用いた。
上記測定値の平均値を、樹脂発泡体シートの「厚み」(mm)とした。
上記最大値と上記最小値の差を、「厚み公差(厚みレンジ)」(mm)とした。
上記測定値を小さい順に並べたときに中央に位置する値を、「厚みの中心値」(mm)とした。
上記測定値から標準偏差を求め、「厚みの標準偏差」とした。
また、下記式(1)より、「式(1)より求められる値」(%)を算出した。
(厚み公差)/(厚みの中心値)×100 (1)
樹脂発泡体シートの熱で溶融処理された面の表面被覆率を測定し、その値を樹脂発泡体シートの表面被覆率とした。なお、両面が熱で溶融処理された面である場合には両面の表面被覆率を求めて、小さい方の値をその樹脂発泡体シートの表面被覆率とした。また、両面が熱で溶融処理されていない面である場合は任意の一方の面の表面被覆率を測定し、その値を樹脂発泡体シートの表面被覆率とした。
表面被覆率は、下記式(2)より、求めた。
表面被覆率(%)=[(表面の面積)-(表面に存在する孔の面積)]/(表面の面積)×100 (2)
表面の面積及び表面に存在する孔の面積は、マイクロスコープ(装置名「VHX600」、株式会社キーエンス製)用いて得られた測定面の画像より求めた。
マイクロスコープによる観察では、照明方法として側射照明を採用し、その照度は17000ルクスとした。また、倍率は500倍とした。
照明兼カメラとして照明内蔵レンズカメラ(装置名「0P72404」、株式会社キーエンス製)を使用し、またレンズとしてズームレンズ(商品名「VH-Z100」、株式会社キーエンス製)を使用した。
なお、照度は、照度計(商品名「VHX600」、カスタム社製)を用いて調節した。
厚み精度は、下記式(3)より求めた。
なお、目的値は、狙いとする厚みの値(狙い厚みの値、目的とする厚みの値)である。例えば、実施例1の目的値はセットしたギャップの大きさである0.20mmであり、実施例3の目的値は最終的にセットしたギャップの大きさである0.10mmである。
厚み精度(%)=[(厚み公差)/2]/(目的値)×100 (3)
樹脂発泡体シート作製時における巻き取りの際に千切れや破断が発生するか否か、巻き取られた巻回体にシワ(巻きジワ)が発生するか否かを確認し、下記基準で評価した。
評価基準
「問題なし」:千切れや破断が発生せず、且つ、シワが発生しない。
「シワ発生」:シワが発生
11 繰出ロール
12 ピンチロール
13 刃(スライス刃)
14 ガイドロール
15 巻取ロール
16 樹脂発泡体
2 加熱ロールを有する連続処理装置
21 繰出ロール
22 ガイドロール
23 加熱ロール(熱誘電ロール)
24 冷却ロール
25 巻取ロール
26 樹脂発泡体
a 流れ方向
Claims (5)
- 見掛け密度が0.03~0.30g/cm3、50%圧縮時の圧縮応力が5.0N/cm2以下、厚みが0.05mm以上0.40mm以下、長さが5m以上、幅が300mm以上であることを特徴とする樹脂発泡体シート。
- 下記式(1)より求められる値が、25%以下である請求項1記載の樹脂発泡体シート。
(厚み公差)/(厚みの中心値)×100 (1)
厚み公差:長さ方向の1点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、さらに前記長さ方向の1点から長さ方向に1m移動した点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、得られた全ての測定値の最大値と最小値の差をいう。
厚みの中心値:長さ方向の1点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、さらに前記長さ方向の1点から長さ方向に1m移動した点で一方の端部から他方の端部まで幅方向10mm毎に厚みを測定し、得られた全ての測定値を小さい順に並べたとき中央に位置する値をいう。 - 少なくとも一方の面の、下記式(2)で定義される表面被覆率が40%以上である請求項1又は2記載の樹脂発泡体シート。
表面被覆率(%)=[(表面の面積)-(表面に存在する孔の面積)]/(表面の面積)×100 (2) - 樹脂組成物を発泡させ、さらに表面を加熱溶融処理することにより形成される請求項1~3の何れか1項に記載の樹脂発泡体シート。
- 請求項1~4の何れか1項に記載の樹脂発泡体シートの少なくとも一方の面側に粘着剤層を有する樹脂発泡複合体。
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| CN201280048434.8A CN103842419B (zh) | 2011-10-11 | 2012-09-10 | 树脂发泡体片以及树脂发泡复合体 |
| KR1020207000154A KR102121184B1 (ko) | 2011-10-11 | 2012-09-10 | 수지 발포체 시트 및 수지 발포 복합체 |
| US14/349,810 US20140242371A1 (en) | 2011-10-11 | 2012-09-10 | Resin foam sheet and resin foam composite material |
| KR1020147012223A KR101991534B1 (ko) | 2011-10-11 | 2012-09-10 | 수지 발포체 시트 및 수지 발포 복합체 |
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| JP2012196779A JP5990435B2 (ja) | 2011-10-11 | 2012-09-07 | 樹脂発泡体シート及び樹脂発泡複合体 |
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| JP (1) | JP5990435B2 (ja) |
| KR (3) | KR102121184B1 (ja) |
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| WO2013161714A1 (ja) * | 2012-04-27 | 2013-10-31 | 株式会社イノアックコーポレーション | 樹脂発泡体の製造方法および樹脂発泡体 |
| WO2013180162A1 (ja) * | 2012-05-31 | 2013-12-05 | 日東電工株式会社 | 熱可塑性樹脂発泡体及び発泡シール材 |
| WO2013183662A1 (ja) * | 2012-06-07 | 2013-12-12 | 日東電工株式会社 | 樹脂発泡体及び発泡材 |
| WO2014030513A1 (ja) * | 2012-08-23 | 2014-02-27 | 株式会社ジェイエスピー | ポリエチレン系樹脂押出発泡シート及びガラス板用間紙 |
| WO2014168036A1 (ja) * | 2013-04-10 | 2014-10-16 | 日東電工株式会社 | 樹脂発泡複合体 |
| WO2015146756A1 (ja) * | 2014-03-26 | 2015-10-01 | 日東電工株式会社 | 樹脂発泡体、発泡部材、及び、タッチパネル搭載機器 |
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| JP5990435B2 (ja) * | 2011-10-11 | 2016-09-14 | 日東電工株式会社 | 樹脂発泡体シート及び樹脂発泡複合体 |
| JP2015003828A (ja) * | 2013-05-24 | 2015-01-08 | 株式会社昭和丸筒 | 巻芯および巻芯の弾性体層の復元方法 |
| US10233296B2 (en) * | 2013-05-30 | 2019-03-19 | Kimberly-Clark Worldwide, Inc. | Method of forming creped thin film-like structures from frothed chemistry |
| JP6692182B2 (ja) * | 2016-02-29 | 2020-05-13 | 日本マタイ株式会社 | 機能性フィルムの製造方法 |
| JP6746393B2 (ja) * | 2016-06-15 | 2020-08-26 | 日東電工株式会社 | 樹脂発泡シートの巻回体 |
| JP6986121B2 (ja) * | 2016-06-15 | 2021-12-22 | 日東電工株式会社 | 樹脂発泡シートの巻回体 |
| JP6473846B1 (ja) * | 2017-08-28 | 2019-02-20 | 日東電工株式会社 | 樹脂シートおよび粘着剤層付樹脂シート |
| JP7080707B2 (ja) * | 2018-04-23 | 2022-06-06 | 株式会社イノアックコーポレーション | 発泡体積層シートの製造方法 |
| JP6845349B2 (ja) * | 2018-09-28 | 2021-03-17 | 積水化学工業株式会社 | ポリオレフィン系樹脂発泡体シート |
| CN110549535B (zh) * | 2019-08-26 | 2021-04-27 | 安徽润象新材料科技有限公司 | 一种复合材料夹心板材的生产设备 |
| KR20230006840A (ko) * | 2020-04-14 | 2023-01-11 | 생-고뱅 퍼포먼스 플라스틱스 코포레이션 | 복합 필름 |
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2012
- 2012-09-07 JP JP2012196779A patent/JP5990435B2/ja active Active
- 2012-09-10 CN CN201280048434.8A patent/CN103842419B/zh active Active
- 2012-09-10 KR KR1020207000154A patent/KR102121184B1/ko active Active
- 2012-09-10 KR KR1020197010760A patent/KR20190042753A/ko not_active Abandoned
- 2012-09-10 WO PCT/JP2012/073071 patent/WO2013054620A1/ja not_active Ceased
- 2012-09-10 KR KR1020147012223A patent/KR101991534B1/ko active Active
- 2012-09-10 US US14/349,810 patent/US20140242371A1/en not_active Abandoned
- 2012-10-09 TW TW101137346A patent/TW201321437A/zh unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013161714A1 (ja) * | 2012-04-27 | 2013-10-31 | 株式会社イノアックコーポレーション | 樹脂発泡体の製造方法および樹脂発泡体 |
| US9499675B2 (en) | 2012-04-27 | 2016-11-22 | Inoac Corporation | Method for producing resin foam, and resin foam |
| WO2013180162A1 (ja) * | 2012-05-31 | 2013-12-05 | 日東電工株式会社 | 熱可塑性樹脂発泡体及び発泡シール材 |
| JP2014005452A (ja) * | 2012-05-31 | 2014-01-16 | Nitto Denko Corp | 熱可塑性樹脂発泡体及び発泡シール材 |
| WO2013183662A1 (ja) * | 2012-06-07 | 2013-12-12 | 日東電工株式会社 | 樹脂発泡体及び発泡材 |
| JP2014012821A (ja) * | 2012-06-07 | 2014-01-23 | Nitto Denko Corp | 樹脂発泡体及び発泡材 |
| WO2014030513A1 (ja) * | 2012-08-23 | 2014-02-27 | 株式会社ジェイエスピー | ポリエチレン系樹脂押出発泡シート及びガラス板用間紙 |
| JP5605929B2 (ja) * | 2012-08-23 | 2014-10-15 | 株式会社ジェイエスピー | ポリエチレン系樹脂押出発泡シート及びガラス板用間紙 |
| US9631060B2 (en) | 2012-08-23 | 2017-04-25 | Jsp Corporation | Extruded polyethylene-based resin foam sheet and interleaf sheet for glass plates |
| WO2014168036A1 (ja) * | 2013-04-10 | 2014-10-16 | 日東電工株式会社 | 樹脂発泡複合体 |
| WO2015146756A1 (ja) * | 2014-03-26 | 2015-10-01 | 日東電工株式会社 | 樹脂発泡体、発泡部材、及び、タッチパネル搭載機器 |
| JP2015193793A (ja) * | 2014-03-26 | 2015-11-05 | 日東電工株式会社 | 樹脂発泡体、発泡部材、及び、タッチパネル搭載機器 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103842419A (zh) | 2014-06-04 |
| KR20190042753A (ko) | 2019-04-24 |
| JP5990435B2 (ja) | 2016-09-14 |
| JP2013100459A (ja) | 2013-05-23 |
| KR20200004919A (ko) | 2020-01-14 |
| KR20140090181A (ko) | 2014-07-16 |
| TW201321437A (zh) | 2013-06-01 |
| US20140242371A1 (en) | 2014-08-28 |
| KR102121184B1 (ko) | 2020-06-10 |
| KR101991534B1 (ko) | 2019-06-20 |
| CN103842419B (zh) | 2016-06-29 |
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