WO2016159227A1 - Foamed resin sheet and electrical/electronic device provided with same - Google Patents
Foamed resin sheet and electrical/electronic device provided with same Download PDFInfo
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- WO2016159227A1 WO2016159227A1 PCT/JP2016/060646 JP2016060646W WO2016159227A1 WO 2016159227 A1 WO2016159227 A1 WO 2016159227A1 JP 2016060646 W JP2016060646 W JP 2016060646W WO 2016159227 A1 WO2016159227 A1 WO 2016159227A1
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- foamed resin
- resin sheet
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- resin layer
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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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
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
- B32B2266/0242—Acrylic resin
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/538—Roughness
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/72—Density
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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
- B32B2457/00—Electrical equipment
Definitions
- the present invention relates to a foamed resin sheet that can be used as an impact absorbing material, and an electric / electronic device provided with such a foamed resin sheet.
- shock absorbers in the form of thin sheets have been used in various technical fields.
- shock absorbers cushion materials
- Such an impact absorbing material is made of, for example, a foamed resin.
- JP 2011-205539 A Japanese Patent Laid-Open No. 2014-17718
- the shock absorber is also required to be thin.
- a resin material having a low glass transition temperature as a constituent material of the shock absorbing material in order to ensure shock absorbing properties in a thin foamed resin body.
- resin materials having a low glass transition temperature generally have high adhesiveness at room temperature. The higher the tackiness of the application surface (the surface that is planned to be attached to a predetermined location) in the shock absorber, the more the impact absorber is intended for the location other than the location where the device is planned to be applied. Adhesion tends to occur, making handling difficult.
- the shock absorbing material whose surface layer is made of a resin film has a relatively low adhesiveness on the surface layer or the pasting surface, so that it may be difficult to follow the concave-convex shape when the portion to be pasted has a surface concave-convex shape.
- the present invention has been conceived under such circumstances, and is a foamed resin sheet suitable for realizing a thin-layer shock absorber having good handleability and excellent followability, And it aims at providing an electrical / electronic device provided with this.
- a foamed resin sheet has a laminated structure including a foamed resin layer and a surface layer.
- the foamed resin layer is a layer containing a foamed resin material as a main agent.
- the surface layer has an exposed surface with a surface roughness of 1.0 ⁇ m or more and contains a filler.
- the surface roughness in this invention shall be represented by arithmetic mean roughness (Ra).
- the exposed surface of the surface layer can form an affixing surface of the foamed resin sheet (a surface that is scheduled to be adhered to a predetermined location). It can be pasted and used.
- This foamed resin sheet has a surface layer separately from the foamed resin layer. Therefore, in this foamed resin sheet, a resin material having a relatively low glass transition temperature and thus a relatively high adhesiveness is adopted as the foamed resin while adopting a material having a relatively low adhesiveness for the surface layer. It is possible to adopt for the layer.
- the surface layer has an exposed or pasted surface.
- the foamed resin sheet which can set a relatively low glass transition temperature for the foamed resin layer independently of the adhesiveness of the pasted surface, is thin while ensuring shock absorption. It is suitable for planning. That is, this foamed resin sheet is suitable for realizing a thin-layer impact absorbing material having a high impact absorbing property.
- this foamed resin sheet that can set the adhesiveness of the surface layer independently of the adhesiveness of the foamed resin layer, it is intended to suppress unintentional adhesion to places other than the place to be pasted in the installation process etc. Furthermore, it is possible to set the low adhesiveness by selecting a constituent material for the surface layer.
- Such a foamed resin sheet is suitable for realizing a thin-layer impact absorbing material having good handleability in terms of suppressing unintentional adhesion.
- the surface layer of the foamed resin sheet has an exposed surface or a pasted surface with a surface roughness of 1.0 ⁇ m or more.
- the pasting location and the pasting surface The frictional force generated during the period is relatively small. This is considered to be because the so-called true contact area between the pasting place and the pasting surface is relatively small. Therefore, this foamed resin sheet is easy to align with the planned pasting location in the process of arranging the device.
- Such a foamed resin sheet is suitable for realizing a thin-layer impact absorbing material having good handleability in that it can be easily aligned in the pasting process.
- the foamed resin sheet contains a filler in the surface layer.
- the filler in the surface layer functions as a breaking point that prevents continuity of the polymer structure.
- Such a configuration is suitable for facilitating deformation of the surface layer. Therefore, this foamed resin sheet is suitable for making it easy to follow the uneven
- Such a foamed resin sheet is suitable for realizing a thin-layer impact absorbing material having excellent followability.
- the present foamed resin sheet is suitable for realizing a thin-layer impact absorbing material having good handleability and excellent followability.
- the exposed surface of the surface layer is 300 mm / min parallel to the test surface under a load of 50 g toward the test surface in a surface contact state with an area of 8 cm 2 with respect to the test surface made of polyethylene terephthalate.
- frictional force is defined as the stress generated when pulled at speed, and at 10 kN / m 2 or less, preferably 2.0 kN / m 2 or less.
- the present foamed resin sheet having such a configuration is suitable for realizing a thin-layer impact absorbing material having good handleability in that it can be easily aligned in the pasting process.
- the surface roughness of the exposed surface of the surface layer is 1.5 ⁇ m or more.
- Such a configuration is suitable for realizing, for example, 2.0 kN / m 2 or less with respect to the above frictional force. Therefore, the foamed resin sheet having the configuration is easy to align in the pasting process. It is suitable for realizing a thin-layer impact absorbing material having good handleability.
- the surface roughness of the exposed surface of the surface layer is 10 ⁇ m or less.
- Such a configuration contributes to uniform thickness of the surface layer. As the thickness of the surface layer to be adhered to the adherend is more uniform, the adhesion reliability of the surface layer to the adherend or its exposed surface tends to be higher.
- the foamed resin sheet has a loss tangent (tan ⁇ ), which is a ratio of a loss elastic modulus and a storage elastic modulus at an angular frequency of 1 rad / s in dynamic viscoelasticity measurement, in a range of ⁇ 50 to 50 ° C.
- ⁇ loss tangent
- the intensity of the peak top is preferably 0.2 or more.
- the average cell diameter of the bubbles contained in the foamed resin layer is 10 to 150 ⁇ m.
- the configuration in which the average cell diameter in the foamed resin layer is 10 ⁇ m or more is suitable for realizing high shock absorption for the foamed resin layer.
- the configuration in which the average cell diameter in the foamed resin layer is 150 ⁇ m or less is suitable for realizing sufficient compression recovery for the foamed resin layer.
- the thickness of the foamed resin layer is 30 to 200 ⁇ m.
- the configuration in which the thickness of the foamed resin layer is 30 ⁇ m or more is suitable for realizing uniform dispersion of bubbles in the foamed resin layer.
- the uniform dispersion of the bubbles in the foamed resin layer contributes to realizing high shock absorption for the foamed resin layer.
- the configuration in which the thickness of the foamed resin layer is 200 ⁇ m or less contributes to the reduction in thickness of the foamed resin layer and thus the foamed resin sheet.
- the ratio (the former / the latter) of the average cell diameter of the bubbles contained in the foamed resin layer to the thickness of the foamed resin layer is 0.2 to 0.9.
- Such a configuration is suitable for realizing high shock absorption for the foamed resin layer.
- the apparent density of the foamed resin layer is 0.2 to 0.7 g / cm 3 .
- the configuration in which the apparent density of the foamed resin layer is 0.2 g / cm 3 or more is suitable for realizing sufficient strength for the foamed resin layer.
- the configuration in which the apparent density of the foamed resin layer is 0.7 g / cm 3 or less is suitable for realizing high shock absorption for the foamed resin layer.
- the foamed resin layer contains an acrylic resin as a main agent.
- an acrylic resin as a main agent.
- the surface layer contains a urethane resin as a main agent.
- the filler is carbon black and / or titanium oxide.
- the foamed resin layer and the surface layer are in contact with each other. That is, it is preferable that the foamed resin layer and the surface layer have a laminated structure in direct contact. According to such a configuration in which no other layer is interposed between the foamed resin layer and the surface layer, the surface layer formed by, for example, the printing method on the predetermined substrate is transferred to the foamed resin layer having high surface adhesiveness. Through this process, the foamed resin sheet can be appropriately manufactured.
- an electric / electronic device including the foamed resin sheet according to the first aspect of the present invention.
- the electric / electronic device includes, for example, a display unit and the foamed resin sheet bonded to the display unit.
- This electric / electronic device is suitable for realizing an electric / electronic device provided with a thin-layer shock absorber having good handling properties and excellent followability.
- FIG. 1 is a partial cross-sectional schematic view of a foamed resin sheet X according to one embodiment of the present invention.
- the foamed resin sheet X has a laminated structure including the foamed resin layer 10 and the surface layer 20.
- the foamed resin layer 10 is a layer containing a foamed resin material as a main agent, and has a first surface 11 and a second surface 12.
- the main agent is a component occupying the largest mass ratio among the constituent components.
- the surface layer 20 is provided on the first surface 11 side of the foamed resin layer 10 and has an exposed surface 21.
- the exposed surface 21 of the surface layer 20 can form an affixing surface of the foamed resin sheet X (a surface scheduled to be adhered to a predetermined location), and the foamed resin sheet X is on the surface layer 20 side. It can be used by being affixed to a predetermined location.
- the foamed resin layer 10 is a part for exhibiting an impact absorbing function in the foamed resin sheet X, and includes a resin material, and has an open cell structure, closed cell structure, or semi-continuous semi-closed cell structure (bubbles). The structure is not shown).
- the resin material for forming the foamed resin layer 10 include acrylic resins, rubbers, and urethane resins. With the foamed resin layer 10 as a constituent material, one type of resin material may be used, or two or more types of resin materials may be used.
- the acrylic resin is a resin containing, as a main monomer unit, an acrylic monomer unit derived from an acrylic monomer having at least one acryloyl group or methacryloyl group in the molecule.
- (meth) acryl means “acryl” and / or “methacryl” (ie, “acryl”, “methacryl”, or both “acryl” and “methacryl”).
- acrylic monomer for forming the acrylic resin examples include (meth) acrylic acid, (meth) acrylonitrile, and isobornyl (meth) acrylate.
- acrylic monomer for forming the acrylic resin further include (meth) acrylic acid alkyl esters such as methyl methacrylate, ethyl methacrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate, ) Acrylamide-containing acrylic monomers such as acrylamide and N-hydroxyethyl (meth) acrylamide, heterocyclic-containing vinyl monomers such as N-vinyl-2-pyrrolidone, and hydroxyl group-containing acrylic monomers such as 2-hydroxyethyl methacrylate. It is done.
- a monomer for forming the acrylic resin one kind of acrylic monomer may be used, or two or more kinds of acrylic monomers may be used.
- the rubber for forming the foamed resin layer 10 may be either natural rubber or synthetic rubber.
- the rubber include nitrile rubber (NBR), methyl methacrylate-butadiene rubber (MBR), styrene-butadiene rubber (SBR), acrylic rubber (ACM, ANM), urethane rubber (AU), and silicone rubber.
- NBR nitrile rubber
- MRR methyl methacrylate-butadiene rubber
- SBR styrene-butadiene rubber
- acrylic rubber ACM, ANM
- AU urethane rubber
- silicone rubber silicone rubber
- Examples of the urethane-based resin for forming the foamed resin layer 10 include polycarbonate-based polyurethane, polyester-based polyurethane, and polyether-based polyurethane.
- the lower limit of the average cell diameter related to the bubbles contained in the foamed resin layer 10 is from the viewpoint of realizing high shock absorption for the foamed resin layer 10.
- the upper limit of the average cell diameter is preferably 150 ⁇ m, more preferably 140 ⁇ m, still more preferably 130 ⁇ m, and particularly preferably from the viewpoint of realizing sufficient compression recovery for the foamed resin layer 10. 100 ⁇ m.
- the average cell diameter can be determined using a microscope apparatus such as a scanning electron microscope (SEM) or a digital microscope.
- a cross section of the foamed resin layer 10 is observed using a microscope apparatus, and an image in which about 20 to 40 cells that are bubbles are included in the cross section is taken. Thereafter, for the cells in the image, 20 or more areas are measured in order from the cell having the largest diameter, and the average value of the diameters of the circles is calculated based on the measured area by image analysis.
- the lower limit of the thickness of the foamed resin layer 10 is preferably 30 ⁇ m, more preferably 40 ⁇ m, and even more preferably 50 ⁇ m, from the viewpoint of achieving uniform dispersion of bubbles in the foamed resin layer 10. is there. It is preferable that the bubbles are uniformly dispersed in the foamed resin layer 10 in order to achieve high shock absorption for the foamed resin layer 10.
- the upper limit of the thickness of the foamed resin layer 10 is preferably 200 ⁇ m, more preferably 150 ⁇ m, still more preferably 120 ⁇ m, and particularly preferably from the viewpoint of thinning the foamed resin layer 10 and thus the foamed resin sheet X. 100 ⁇ m.
- the lower limit of the apparent density of the foamed resin layer 10 is preferably 0.2 g / cm 3 , more preferably 0.21 g / cm 3 from the viewpoint of realizing sufficient strength for the foamed resin layer 10. More preferably, it is 0.22 g / cm 3 .
- the upper limit of the apparent density is preferably 0.7 g / cm 3 , more preferably 0.6 g / cm 3 , and still more preferably 0 from the viewpoint of realizing high shock absorption for the foamed resin layer 10. a .5g / cm 3, particularly preferably 0.4 g / cm 3.
- the ratio of the average cell diameter ( ⁇ m) to the thickness ( ⁇ m) (the former / the latter) in the foamed resin layer 10 is 0.2 to 0.9 from the viewpoint of realizing high shock absorption for the foamed resin layer 10. Preferably, it is in the range of 0.25 to 0.85, more preferably in the range of 0.3 to 0.8.
- the impact absorption of the foamed resin body is a loss (the former / the latter) of the loss elastic modulus and storage elastic modulus at the angular frequency of 1 rad / s in the dynamic viscoelasticity measurement.
- the temperature at the peak top of the tangent (tan ⁇ ) can also be affected.
- the peak top of the loss tangent (tan ⁇ ) in the foamed resin layer 10 is preferably in the range of ⁇ 50 to 50 ° C.
- the peak tangent of the loss tangent in the foamed resin sheet X including the foamed resin layer 10 as a main structural element is also preferably in the range of ⁇ 50 to 50 ° C.
- the lower limit of the temperature range in which the loss tangent peak top exists is preferably ⁇ 40 ° C., more preferably ⁇ 30 ° C., from the viewpoint of realizing sufficient compression recovery for the foamed resin layer 10 or the foamed resin sheet X. More preferably, it is ⁇ 20 ° C.
- the upper limit of the temperature range is preferably 40 ° C., more preferably 30 ° C., and still more preferably from the viewpoint of realizing high flexibility or high shock absorption for the foamed resin layer 10 or the foamed resin sheet X. 20 ° C.
- the loss which is the ratio of the loss elastic modulus at the angular frequency of 1 rad / s and the storage elastic modulus in the dynamic viscoelasticity measurement of the resin body solidified without foaming the resin composition for forming the foamed resin layer 10
- the peak top of the tangent (tan ⁇ ) is also preferably in the range of ⁇ 50 to 50 ° C. In the case of a material having two or more loss tangent peak tops, at least one peak top is preferably within the above temperature range.
- the peak top strength (maximum value) of the loss tangent is preferably higher from the viewpoint of realizing high shock absorption, for example 0.2 or more, preferably 0.3 or more.
- the upper limit value of the peak top intensity is, for example, 2.0.
- the peak top strength of loss tangent (tan ⁇ ) in the range of ⁇ 50 to 50 ° C. of the resin body solidified without foaming the resin composition for forming the foamed resin layer 10 is also from the viewpoint of shock absorption. Higher is preferred.
- the loss tangent peak top strength in the resin body corresponds to a value obtained by dividing the loss tangent peak top strength in the foamed resin layer 10 by the apparent density of the foamed resin layer 10.
- a resin containing for example, when an acrylic resin is employed, foaming is performed using an acrylic resin containing an acrylic monomer having a homopolymer Tg of ⁇ 10 ° C. or more and an acrylic monomer having a homopolymer Tg of less than ⁇ 10 ° C. as essential monomer units.
- the resin layer 10 is preferably configured.
- Tg of homopolymer means “glass transition temperature (Tg) of homopolymer of the monomer”, specifically “Polymer Handbook” (3rd edition, John Wiley & Sons, Inc, 1987).
- the numbers are listed in Tg of a homopolymer related to a monomer not described in this document refers to, for example, a value obtained by the following measurement method (see Japanese Patent Application Laid-Open No. 2007-51271).
- a reactor equipped with a thermometer, a stirrer, a nitrogen inlet tube and a reflux condenser is charged with 100 parts by weight of monomer, 0.2 part by weight of 2,2′-azobisisobutyronitrile, and acetic acid as a polymerization solvent.
- This test sample was punched into a disk shape having a diameter of 7.9 mm, sandwiched between parallel plates, and using a viscoelasticity tester (ARES, manufactured by Rheometrics), applying a shear strain at a frequency of 1 Hz in a shear mode. Measure viscoelasticity.
- the temperature range for measurement is ⁇ 70 to 150 ° C., and the temperature increase rate for measurement is 5 ° C./min.
- the peak top temperature of the loss tangent (tan ⁇ ) obtained by such measurement is defined as Tg of the homopolymer.
- acrylic monomer having a homopolymer Tg of ⁇ 10 ° C. or higher examples include (meth) acrylonitrile, (meth) acrylic acid, and isobornyl (meth) acrylate.
- acrylic monomers having a homopolymer Tg of ⁇ 10 ° C. or more include amide group-containing monomers such as (meth) acrylamide and N-hydroxyethyl (meth) acrylamide, and homopolymers such as methyl methacrylate and ethyl methacrylate.
- heterocyclic-containing vinyl monomers such as N-vinyl-2-pyrrolidone, and hydroxyl group-containing acrylic monomers such as 2-hydroxyethyl methacrylate.
- (meth) acrylonitrile (especially acrylonitrile) is particularly preferred.
- (meth) acrylonitrile (especially acrylonitrile) is used as a monomer having a Tg of ⁇ 10 ° C. or more for the formation of an acrylic resin for forming a foamed resin layer, the intermolecular interaction is strong. It is easy to obtain a large peak top intensity with respect to the loss tangent.
- the acrylic monomer having a homopolymer Tg of ⁇ 10 ° C. or more one type of acrylic monomer may be used, or two or more types of acrylic monomers may be used.
- acrylic monomers having a Tg of homopolymer of less than ⁇ 10 ° C. include (meth) acrylic acid alkyl esters having a Tg of less than ⁇ 10 ° C. of homopolymers such as ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate. Etc. Among these, acrylic acid C 2-8 alkyl ester is particularly preferable.
- the acrylic monomer having a homopolymer Tg of less than ⁇ 10 ° C. one kind of acrylic monomer may be used, or two or more kinds of acrylic monomers may be used.
- the content of the acrylic monomer having a Tg of ⁇ 10 ° C. or more with respect to the total monomer components (total amount of monomer components) for forming the acrylic resin is, for example, 2 to 30% by weight. Further, the content of the acrylic monomer having a Tg of the homopolymer of less than ⁇ 10 ° C. with respect to the total monomer components for forming the acrylic resin (total amount of monomer components) is, for example, 70 to 98% by weight.
- the foamed resin layer 10 may contain a surfactant, a crosslinking agent, a thickener, a rust preventive agent and other additives as necessary in addition to the resin material as described above. Moreover, the foamed resin layer 10 may further contain other components within a range not impairing the impact absorbability.
- Such other components include resin components other than those described above, softeners, antioxidants, anti-aging agents, gelling agents, curing agents, plasticizers, fillers, reinforcing agents, foaming agents (such as baking soda) ), Microcapsules (thermally expandable microspheres, etc.), flame retardants, light stabilizers, UV absorbers, colorants (pigments, dyes, etc.), pH adjusters, solvents (organic solvents), thermal polymerization initiators, photopolymerization Initiators are mentioned.
- the surface layer 20 of the foamed resin sheet X has the exposed surface 21 as described above, and contains a filler (not shown).
- the exposed surface 21 of the surface layer 20 can be a surface to which the foamed resin sheet X is attached, and has a surface roughness of 1.0 to 10 ⁇ m.
- the surface roughness is expressed by arithmetic average roughness (Ra).
- the lower limit of the surface roughness of the exposed surface 21 is 1.0 [mu] m, preferably 1.5 [mu] m, more preferably 3.0 [mu] m, and still more preferably 4, from the viewpoint of realizing a small friction coefficient on the exposed surface 21. It is 0 ⁇ m, particularly preferably 4.5 ⁇ m.
- the upper limit of the surface roughness of the exposed surface 21 is 10 ⁇ m from the viewpoint of uniforming the thickness of the surface layer 20. With such surface roughness, the exposed surface 21 is brought into contact with the test surface under a load of 50 g toward the test surface in a state of surface contact with the test surface made of polyethylene terephthalate with an area of 8 cm 2.
- the frictional force defined as stress generated when pulled in parallel at a speed of 300 mm / min is set to 10 kN / m 2 or less.
- the frictional force is preferably 2.0 kN / m 2 or less, more preferably 1.5 kN / m 2 or less, and more preferably 1.0 kN / m 2 or less.
- Examples of the matrix resin material or binder resin material for forming the surface layer 20 containing the filler include urethane resin, phenol resin, epoxy resin, urea melamine resin, silicone resin, phenoxy resin, and methacrylic resin.
- Resin acrylic resin, polyester resin (polyethylene terephthalate, etc.), polyolefin resin (polyethylene, polypropylene, ethylene-propylene copolymer, etc.), polystyrene resin (polystyrene, styrene-acrylonitrile copolymer, styrene-butadiene copolymer) Styrene-maleic anhydride copolymer, acrylonitrile-butadiene-styrene resin, etc.), polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyvinylidene chloride, polycarbonate DOO, celluloses (cellulose acetate resins, such as
- resins containing no halogen or sulfur are preferable, and urethane resins are particularly preferable.
- a matrix resin material for forming the surface layer 20 one kind of binder resin may be used, or two or more kinds of binder resins may be used.
- pigments and other additives can be used as the filler contained in the surface layer 20 .
- additives include carbon black, graphite, titanium oxide, copper oxide, manganese dioxide, aniline black, perylene black, ferrite, magnetite, chromium oxide, iron oxide, molybdenum disulfide, and chromium complex. .
- carbon black is preferable from the viewpoint of cost and availability.
- Titanium oxide is also preferable because the particle size is stably maintained.
- One type of filler may be used, or two or more types of fillers may be used.
- the filler content in the surface layer 20 is, for example, 20 to 60% by weight.
- the filler content is preferably 20% by weight or more.
- the filler content is preferably 60% by weight or less.
- the foamed resin sheet X can be manufactured, for example, by forming the foamed resin layer 10 and the surface layer 20 separately and then transferring the surface layer 20 to the foamed resin layer 10.
- the foamed resin layer 10 for the foamed resin sheet X can be formed by subjecting a resin composition containing the above-described predetermined resin material to foam molding.
- a resin composition to be subjected to foam molding a resin solution in which a resin material is dissolved in a solvent may be used, or an emulsion (emulsion resin composition) containing the resin material may be used. From the viewpoint of appropriately forming bubbles, it is preferable to use an emulsion resin composition.
- the emulsion resin composition a blend of two or more types of emulsions may be used.
- the solid content concentration of the emulsion is preferably higher from the viewpoint of film formability, and is, for example, 30% by weight or more.
- a physical method or a chemical method can be employed as a foaming method.
- gas components are dispersed in the resin composition by mechanical stirring, and bubbles are formed.
- bubbles are formed by a gas generated by thermal decomposition of the foaming agent added to the resin material.
- the foamed resin layer 10 is preferably formed through a step of foaming the emulsion resin composition by mechanical stirring.
- devices that can be used for foaming include high-speed shearing devices, vibration-type devices, and pressurized gas discharge-type devices.
- the high-speed shearing method is preferable from the viewpoint of finer bubble diameter and large capacity production.
- Bubbles when foamed by mechanical stirring are those in which gas (gas) is taken into the emulsion.
- gas gas
- a gas inert to the emulsion can be used.
- gases include, for example, air, nitrogen, and carbon dioxide.
- a foamed resin composition for example, an emulsion resin composition
- the substrate include a peel-treated plastic film (such as a peel-treated polyethylene terephthalate film), a plastic film (such as a polyethylene terephthalate film), and a heat conductive layer.
- a bubble-containing resin composition for example, an emulsion resin composition applied on a substrate is dried at 50 ° C. or higher and lower than 125 ° C., and then dried at 125 ° C. or higher and 200 ° C. or lower. And a drying step.
- the pre-drying step is significant because the bubbles are likely to coalesce or burst due to a rapid rise in temperature.
- the foamed resin layer 10 can be formed as described above.
- the surface layer 20 for the foamed resin sheet X can be formed as a printing layer by, for example, a printing method. Specifically, it can be formed by applying a composition containing the above-described binder resin, the above-described filler, and a predetermined solvent on a support, drying the composition, and curing the composition as necessary.
- the surface (surface to be coated) on which the composition is applied on the support has a surface roughness for realizing the above-described surface roughness on the surface layer 20 or the exposed surface 21.
- the surface roughness of the coated surface of the support is, for example, 1.0 to 10.0 ⁇ m.
- Examples of the composition application method in this step include various coating methods, gravure printing method, flexographic printing method, offset printing method, letterpress printing method, and screen printing method.
- the surface layer 20 formed as described above is transferred to the surface of the foamed resin layer 10. Specifically, first, the surface layer 20 formed on the support as described above is bonded to the first surface 11 of the foamed resin layer 10 formed on the substrate as described above. . Thereby, the surface layer 20 is appropriately transcribe
- the foamed resin sheet X can be manufactured as described above. The foamed resin sheet X that can be manufactured in this way may be distributed in the market while being wound in a roll. The support is peeled off from the surface layer 20 immediately before using the foamed resin sheet X, for example.
- the foamed resin sheet X has a surface layer 20 in addition to the foamed resin layer 10. Therefore, in the foamed resin sheet X, while adopting a material having a relatively low adhesiveness for the surface layer 20, a foamed resin material having a relatively low glass transition temperature and thus a relatively high adhesiveness is foamed. It can be employed for the resin layer 10.
- the surface layer 20 has an exposed surface 21 or a pasting surface, and the foamed resin sheet X capable of setting a relatively low glass transition temperature for the foamed resin layer 10 independently of the adhesiveness of the pasting surface ensures shock absorption. However, it is suitable for reducing the thickness. That is, the foamed resin sheet X is suitable for realizing a thin-layer shock absorber having high shock absorption.
- foamed resin sheet X in which the adhesiveness of the surface layer 20 can be set independently of the adhesiveness of the foamed resin layer 10, unintentional adhesion to places other than those scheduled to be applied is suppressed in the process of disposing the equipment.
- Such a foamed resin sheet X is suitable for realizing a thin-layer impact absorbing material having good handleability in terms of suppressing unintended adhesion.
- the surface layer 20 of the foamed resin sheet X has an exposed surface 21 or a pasted surface having a surface roughness of 1.0 ⁇ m or more.
- the pasting place and the pasting surface The frictional force generated during the period is relatively small. This is considered to be because the so-called true contact area between the pasting place and the pasting surface is relatively small. Therefore, the foamed resin sheet X is easy to align with the planned pasting location in the process of arranging the device.
- Such a foamed resin sheet X is suitable for realizing a thin-layer impact absorbing material having good handleability in that it is easy to align in the pasting process.
- the foamed resin sheet X contains a filler in the surface layer 20 thereof.
- the filler in the surface layer 20 functions as a breaking point that prevents the continuity of the polymer structure when the surface layer 20 includes a so-called binder component and has a polymer structure.
- Such a configuration is suitable for making the surface layer 20 easily deformable. Therefore, the foamed resin sheet X is suitable for making it easy to follow the concavo-convex shape when the pasted portion has a surface concavo-convex shape.
- Such a foamed resin sheet X is suitable for realizing a thin-layer impact absorbing material having excellent followability.
- the foamed resin sheet X is suitable for realizing a thin-layer impact absorbing material having good handling properties and excellent followability.
- FIG. 2 is a schematic cross-sectional view of an electric / electronic device Y according to another embodiment of the present invention.
- the electric / electronic device Y is configured as a portable device, and includes a casing 31, a panel 32, a display unit 33, and the above-described foamed resin sheet X. Examples of portable devices include mobile phones, smartphones, and tablet PCs.
- the housing 31 is an element for housing the panel 32, the display unit 33, the foamed resin sheet X, and other various components (not shown).
- the panel 32 is configured as a touch panel, for example.
- the display unit 33 is a unit configured to function as, for example, a liquid crystal display (LCD), an organic EL display (organic electroluminescence display), or a plasma display, and displays an image on the panel 32 side. Is arranged.
- the foamed resin sheet X is bonded to the back surface (the surface opposite to the image display surface) of the display unit 33, and is sandwiched between the housing 31 and the display unit 33 in the present embodiment.
- the foamed resin sheet X is joined to the display unit 33 on the exposed surface 21 (not shown in FIG. 2) side.
- Such an electric / electronic device Y is suitable for realizing an electric / electronic device including a thin-layer impact absorbing material (foamed resin sheet X) having excellent handling properties and excellent followability.
- % representing the content means weight%
- number of parts is a value in terms of solid content (nonvolatile content).
- a foamed resin layer for the foamed resin sheet was formed as follows. First, 100 parts by weight of an acrylic emulsion solution (solid content 55%, ethyl acrylate-butyl acrylate-acrylonitrile copolymer [weight ratio 45: 48: 7]) and fatty acid ammonium surfactant (water of ammonium stearate) 2 parts by weight of a dispersion, solid content 33%), 2 parts by weight of a carboxybetaine type amphoteric surfactant (trade name: Amogen CB-H, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) and an oxazoline-based cross-linking agent (trade name: Epocross) WS-500, manufactured by Nippon Shokubai Co., Ltd., solid content 39%) 10 parts by weight, carbon black as a pigment (trade name: NAF-5091, manufactured by Dainichi Seika Kogyo Co., Ltd.), and polyacrylic acid thicken
- the foamed composition thus obtained was applied to a PET (polyethylene terephthalate) film (thickness: 38 ⁇ m, trade name: MRF # 38, manufactured by Mitsubishi Plastics Co., Ltd.) subjected to surface peeling treatment. Applied.
- the coating film of the foaming composition F on the PET was dried through a preliminary drying step at 70 ° C. for 4.5 minutes and a main drying step at 140 ° C. for 4.5 minutes. As described above, a 130 ⁇ m thick foamed resin layer having a closed cell structure was formed.
- the average cell diameter of the foamed resin layer formed as described above was 75 ⁇ m.
- the average cell diameter ( ⁇ m) is obtained by capturing an enlarged image of the cross section of the foamed resin layer using a low vacuum scanning electron microscope (trade name: S-3400N scanning electron microscope, manufactured by Hitachi High-Tech Science Systems Co., Ltd.) and performing image analysis. Asked.
- the apparent density of the foamed resin layer formed as described above was 0.28 g / cm 3 .
- the apparent density was determined as follows. First, the foamed resin layer was punched with a 100 mm ⁇ 100 mm punching blade mold, and the dimensions of the punched sample were measured. Next, the thickness was measured with a 1/100 dial gauge having a measurement terminal diameter ( ⁇ ) of 20 mm. The volume of the foamed resin layer was calculated from these values. On the other hand, the weight of the foamed resin layer was measured with an upper pan balance having a minimum scale of 0.01 g or more. From the measured weight and the calculated volume, the apparent density (g / cm 3 ) of the foamed resin layer was calculated.
- the initial elastic modulus of the foamed resin layer formed as described above was 1.15 N / mm 2 .
- the initial elastic modulus (N / mm 2 ) was calculated from the slope at 10% strain in a tensile test at a tensile speed of 300 mm / min in a 23 ° C. environment.
- a separator made of polyethylene, thickness 25 ⁇ m having a surface layer formed thereon was prepared.
- the surface on which the surface layer is formed in the separator is a surface roughness for generating a surface roughness of 4.0 ⁇ m or more on the surface of the surface layer (surface that will form an exposed surface in the surface layer of the foamed resin sheet).
- the thickness is 5.2 ⁇ m.
- This surface roughness of the separator is caused by surface irregularities formed irregularly on the surface of the mold for molding the separator by the sandblast method.
- the surface layer is formed on such a separator by a printing method, and is a printed layer having a thickness of 1 ⁇ m including urethane resin as a binder component and carbon black as a filler.
- the foamed resin sheet of Example 1 was produced as described above.
- Example 2 A separator (made of polyethylene, thickness 25 ⁇ m) having a surface layer formed thereon was prepared.
- the surface on which the surface layer is formed in the separator is a surface roughness for generating a surface roughness of 4.0 ⁇ m or more on the surface of the surface layer (surface that will form an exposed surface in the surface layer of the foamed resin sheet). It has a thickness of 4.5 ⁇ m.
- This surface roughness of the separator is caused by surface irregularities regularly formed by laser fine groove processing on the surface of the mold for molding the separator.
- the surface layer is formed on such a separator by a printing method, and is printed with an average thickness of 1 ⁇ m including urethane resin as a binder component, carbon black as a filler, and titanium oxide (average particle diameter of 1 ⁇ m). Is a layer. Then, the surface layer was transferred to the foamed resin layer on the PET film in the same manner as in Example 1 except that such a surface layer on the PE separator was used instead of the surface layer according to Example 1. 2 foamed resin sheets were produced.
- Example 3 A separator (made of polyethylene, thickness 50 ⁇ m, trade name: PE-50-SU-C1, manufactured by Fujiko Co., Ltd.) having a surface layer formed thereon was prepared.
- the surface roughness of the surface on which the surface layer is formed in the separator is 1.6 ⁇ m.
- the surface layer is a printing layer having a thickness of 1 ⁇ m formed on the separator by a printing method and containing urethane resin as a binder component and carbon black as a filler in the same manner as in Example 1.
- the surface layer was transferred to the foamed resin layer on the PET film in the same manner as in Example 1 except that such a surface layer on the PE separator was used instead of the surface layer according to Example 1. 3 foamed resin sheets were produced.
- Example 4 A separator (made of polyethylene terephthalate, thickness 50 ⁇ m, trade name: PET-50-SU-C1, manufactured by Fujiko Co., Ltd.) having a surface layer formed thereon was prepared.
- the surface roughness of the surface on which the surface layer is formed in the separator is 1.2 ⁇ m.
- the surface layer is a printing layer having a thickness of 1 ⁇ m formed on the separator by a printing method and containing urethane resin as a binder component and carbon black as a filler in the same manner as in Example 1.
- the above-mentioned foaming composition F was apply
- the coating film of the foaming composition F was dried through a preliminary drying process at 70 ° C. for 4.5 minutes and a main drying process at 140 ° C. for 4.5 minutes.
- the foamed resin sheet of Example 4 was produced as described above.
- Comparative Example 1 A polyethylene surface smooth separator (thickness 25 ⁇ m, trade name: PE-25-SU-C1, manufactured by Fujiko Co., Ltd.) was bonded to the foamed resin layer on the PET film described above with reference to Example 1, and Comparative Example 1 A foamed resin sheet was produced.
- Comparative Example 2 A separator whose surface layer was formed on a separator (made of polyethylene terephthalate, thickness 50 ⁇ m) having a smooth surface was prepared. The surface layer is formed by bonding a PET film (thickness: 4.5 ⁇ m, trade name: trade name: PET-4.5, manufactured by Fujiko Co., Ltd.) to the separator. And the above-mentioned foaming composition F was apply
- the friction force was measured using a universal tensile compression tester (trade name: TCM-1kNB, manufactured by Minebea). Specifically, first, an 8 cm 2 sample sheet cut out from the foamed resin sheet was placed on a friction test surface made of polyethylene terephthalate so that the surface layer of the sample sheet was in surface contact with the test surface. . Next, a 50 g weight was placed and fixed on the foamed resin layer of the placed sample sheet. Then, the weight was pulled in the horizontal direction at a speed of 300 mm / min, and the stress (kN / m 2 ) applied at that time was measured.
- TCM-1kNB universal tensile compression tester
- the foamed resin layer with a surface layer of each of the foamed resin sheets of Examples 1 to 4 had a peak top of loss tangent at ⁇ 8 ° C.
- the peak top intensity (maximum value) was 0.35.
- the peak density at the apparent density of 0.28 g / cm 3 is regarded as the apparent density of the foamed resin layer with the surface layer equal to the apparent density of 0.28 g / cm 3 of the foamed resin layer.
- the value obtained by dividing the strength of 0.35 is 1.25.
- any of the foamed resin sheets of Examples 1 to 4 is evaluated as good or acceptable in the above-described removability test. This means that the foamed resin sheets of Examples 1 to 4 do not stick to the surface layer side so as to be excessively deformed during re-peeling. Therefore, the foamed resin sheets of Examples 1 to 4 are suitable for realizing a thin-layer impact absorbing material having good handleability in terms of suppressing unintended adhesion. Further, in all of the foamed resin sheets of Examples 1 to 4, the frictional force generated by the above-described frictional force measurement is less than 10 kN / m 2 and relatively small.
- the foamed resin sheets of Examples 1 to 4 are suitable for realizing a thin-layer impact absorbing material having good handleability in that it can be easily aligned in the pasting process.
- all of the foamed resin sheets of Examples 1 to 4 are evaluated to be good in the followability test described above. Therefore, the foamed resin sheets of Examples 1 to 4 are suitable for realizing a thin-layer impact absorbing material having excellent followability.
- the foamed resin sheets of Examples 1 to 4 are suitable for realizing a thin-layer impact absorbing material having good handling properties and excellent followability.
Landscapes
- Laminated Bodies (AREA)
Abstract
Description
発泡樹脂シートのための発泡樹脂層を次のように形成した。まず、アクリルエマルション溶液(固形分量55%,アクリル酸エチル-アクリル酸ブチル-アクリロニトリル共重合体[重量比45:48:7])100重量部と、脂肪酸アンモニウム系界面活性剤(ステアリン酸アンモニウムの水分散液,固形分量33%)2重量部と、カルボキシベタイン型両性界面活性剤(商品名:アモーゲンCB-H,第一工業製薬社製)2重量部と、オキサゾリン系架橋剤(商品名:エポクロスWS-500,日本触媒社製,固形分量39%)10重量部と、顔料たるカーボンブラック(商品名:NAF-5091,大日精化工業社製)1重量部と、ポリアクリル酸系増粘剤(アクリル酸エチル-アクリル酸共重合体[アクリル酸20重量%],固形分量28.7%)0.6重量部とを、ディスパー(商品名:ロボミックス,プライミクス社製)を使用して撹拌混合して起泡化した。次に、こうして得られた発泡組成物(発泡組成物F)を、表面剥離処理が施されたPET(ポリエチレンテレフタレート)フィルム(厚さ38μm,商品名:MRF♯38,三菱樹脂社製)上に塗布した。次に、当該PET上の発泡組成物Fの塗膜を、70℃で4.5分の予備乾燥工程と、140℃で4.5分の本乾燥工程とを経て、乾燥させた。以上のようにして、独立気泡構造を有する厚さ130μmの発泡樹脂層を形成した。 [Example 1]
A foamed resin layer for the foamed resin sheet was formed as follows. First, 100 parts by weight of an acrylic emulsion solution (solid content 55%, ethyl acrylate-butyl acrylate-acrylonitrile copolymer [weight ratio 45: 48: 7]) and fatty acid ammonium surfactant (water of ammonium stearate) 2 parts by weight of a dispersion,
セパレーター(ポリエチレン製,厚さ25μm)上に表面層が形成されたものを用意した。セパレーターにおいて表面層が形成されている面は、表面層の表面(発泡樹脂シートの表面層にて露出面をなすこととなる面)に4.0μm以上の表面粗さを生じさせるための表面粗さ4.5μmを有する。セパレーターのこの表面粗さは、セパレーター成形用の鋳型の表面にレーザー微細溝加工によって規則的に形成された表面凹凸に起因して生じたものである。表面層は、このようなセパレーター上に印刷法によって形成されたものであって、バインダー成分たるウレタン系樹脂とフィラーたるカーボンブラックおよび酸化チタン(平均粒径1μm)とを含む平均厚さ1μmの印刷層である。そして、このようなPEセパレーター上の表面層を実施例1に係る表面層に代えて用いた以外は実施例1と同様にして、PETフィルム上の発泡樹脂層に表面層を転写し、実施例2の発泡樹脂シートを作製した。 [Example 2]
A separator (made of polyethylene, thickness 25 μm) having a surface layer formed thereon was prepared. The surface on which the surface layer is formed in the separator is a surface roughness for generating a surface roughness of 4.0 μm or more on the surface of the surface layer (surface that will form an exposed surface in the surface layer of the foamed resin sheet). It has a thickness of 4.5 μm. This surface roughness of the separator is caused by surface irregularities regularly formed by laser fine groove processing on the surface of the mold for molding the separator. The surface layer is formed on such a separator by a printing method, and is printed with an average thickness of 1 μm including urethane resin as a binder component, carbon black as a filler, and titanium oxide (average particle diameter of 1 μm). Is a layer. Then, the surface layer was transferred to the foamed resin layer on the PET film in the same manner as in Example 1 except that such a surface layer on the PE separator was used instead of the surface layer according to Example 1. 2 foamed resin sheets were produced.
セパレーター(ポリエチレン製,厚さ50μm,商品名:PE-50-SU-C1,フジコー社製)上に表面層が形成されたものを用意した。セパレーターにおいて表面層が形成されている面の表面粗さは1.6μmである。表面層は、セパレーター上に印刷法によって形成されたものであって、バインダー成分たるウレタン系樹脂およびフィラーたるカーボンブラックを実施例1と同様に含む厚さ1μmの印刷層である。そして、このようなPEセパレーター上の表面層を実施例1に係る表面層に代えて用いた以外は実施例1と同様にして、PETフィルム上の発泡樹脂層に表面層を転写し、実施例3の発泡樹脂シートを作製した。 Example 3
A separator (made of polyethylene, thickness 50 μm, trade name: PE-50-SU-C1, manufactured by Fujiko Co., Ltd.) having a surface layer formed thereon was prepared. The surface roughness of the surface on which the surface layer is formed in the separator is 1.6 μm. The surface layer is a printing layer having a thickness of 1 μm formed on the separator by a printing method and containing urethane resin as a binder component and carbon black as a filler in the same manner as in Example 1. Then, the surface layer was transferred to the foamed resin layer on the PET film in the same manner as in Example 1 except that such a surface layer on the PE separator was used instead of the surface layer according to Example 1. 3 foamed resin sheets were produced.
セパレーター(ポリエチレンテレフタレート製,厚さ50μm,商品名:PET-50-SU-C1,フジコー社製)上に表面層が形成されたものを用意した。セパレーターにおいて表面層が形成されている面の表面粗さは1.2μmである。表面層は、セパレーター上に印刷法によって形成されたものであって、バインダー成分たるウレタン系樹脂およびフィラーたるカーボンブラックを実施例1と同様に含む厚さ1μmの印刷層である。そして、この印刷層付きセパレーターの印刷層上に上述の発泡組成物Fを塗布した。次に、発泡組成物Fの塗膜を、70℃で4.5分の予備乾燥工程と、140℃で4.5分の本乾燥工程とを経て、乾燥させた。以上のようにして、実施例4の発泡樹脂シートを作製した。 Example 4
A separator (made of polyethylene terephthalate, thickness 50 μm, trade name: PET-50-SU-C1, manufactured by Fujiko Co., Ltd.) having a surface layer formed thereon was prepared. The surface roughness of the surface on which the surface layer is formed in the separator is 1.2 μm. The surface layer is a printing layer having a thickness of 1 μm formed on the separator by a printing method and containing urethane resin as a binder component and carbon black as a filler in the same manner as in Example 1. And the above-mentioned foaming composition F was apply | coated on the printing layer of this separator with a printing layer. Next, the coating film of the foaming composition F was dried through a preliminary drying process at 70 ° C. for 4.5 minutes and a main drying process at 140 ° C. for 4.5 minutes. The foamed resin sheet of Example 4 was produced as described above.
実施例1に関して上述したPETフィルム上の発泡樹脂層に対してポリエチレン製の表面平滑なセパレーター(厚さ25μm,商品名:PE-25-SU-C1,フジコー社製)を張り合わせ、比較例1の発泡樹脂シートを作製した。 [Comparative Example 1]
A polyethylene surface smooth separator (thickness 25 μm, trade name: PE-25-SU-C1, manufactured by Fujiko Co., Ltd.) was bonded to the foamed resin layer on the PET film described above with reference to Example 1, and Comparative Example 1 A foamed resin sheet was produced.
表面が平滑なセパレーター(ポリエチレンテレフタレート製,厚さ50μm)上に表面層が形成されたものを用意した。表面層は、PETフィルム(厚さ4.5μm,商品名:商品名:PET-4.5,フジコー社製)を前記のセパレーターに貼り合わせることによって形成されたものである。そして、このPETフィルム付きセパレーターのPETフィルム上に上述の発泡組成物Fを塗布した。次に、発泡組成物Fの塗膜を、70℃で4.5分の予備乾燥工程と、140℃で4.5分の本乾燥工程とを経て、乾燥させた。以上のようにして、比較例2の発泡樹脂シートを作製した。 [Comparative Example 2]
A separator whose surface layer was formed on a separator (made of polyethylene terephthalate, thickness 50 μm) having a smooth surface was prepared. The surface layer is formed by bonding a PET film (thickness: 4.5 μm, trade name: trade name: PET-4.5, manufactured by Fujiko Co., Ltd.) to the separator. And the above-mentioned foaming composition F was apply | coated on the PET film of this separator with a PET film. Next, the coating film of the foaming composition F was dried through a preliminary drying process at 70 ° C. for 4.5 minutes and a main drying process at 140 ° C. for 4.5 minutes. The foamed resin sheet of Comparative Example 2 was produced as described above.
以下の測定および評価を行った。測定結果および評価結果については、表1内に掲げる。 [Measurement and evaluation]
The following measurements and evaluations were made. The measurement results and evaluation results are listed in Table 1.
実施例1~4および比較例1,2の各発泡樹脂シートの表面層の露出面について、共焦点レーザー顕微鏡(OLS-4000,オリンパス社製)を使用して、倍率10倍で測定した粗さ曲線に基づき平均表面粗さ(Ra)を算出した。 <Surface roughness>
About the exposed surface of the surface layer of each foamed resin sheet of Examples 1 to 4 and Comparative Examples 1 and 2, the roughness measured at a magnification of 10 using a confocal laser microscope (OLS-4000, manufactured by Olympus) Average surface roughness (Ra) was calculated based on the curve.
実施例1~4および比較例1,2の発泡樹脂シートのそれぞれについて、発泡樹脂シートから切り出したサンプルシート(100mm×100mmの正方形)をガラス板上に貼りつけ測定試料とした。水平に置いた測定試料に2kgローラーを一往復させてガラス板とサンプルシートとを圧着させた。30分間の放置の後、常温(23℃)下で180度方向にサンプルシートを剥離した。剥離後のサンプルシートに形状変化が生じなかった場合を良好(◎)と評価し、剥離後のサンプルシートにおいてシート辺に沿った方向に10%未満の形状変化が生じた場合を許容可(○)と評価し、剥離後のサンプルシートにおいてシート辺に沿った方向に10%以上の形状変化が生じた場合を不良(×)と評価した。 <Removability test>
For each of the foamed resin sheets of Examples 1 to 4 and Comparative Examples 1 and 2, a sample sheet (100 mm × 100 mm square) cut out from the foamed resin sheet was attached on a glass plate to obtain a measurement sample. A glass plate and a sample sheet were pressure-bonded by reciprocating a 2 kg roller once to a measurement sample placed horizontally. After leaving for 30 minutes, the sample sheet was peeled in the direction of 180 degrees at room temperature (23 ° C.). The case where the shape change did not occur in the sample sheet after peeling was evaluated as good (◎), and the case where a shape change of less than 10% occurred in the direction along the sheet side in the sample sheet after peeling was acceptable (○ In the sample sheet after peeling, the case where a shape change of 10% or more occurred in the direction along the sheet side was evaluated as defective (x).
実施例1~4および比較例1,2の発泡樹脂シートのそれぞれについて、万能引張圧縮試験機(商品名:TCM-1kNB,ミネベア社製)を使用して、摩擦力を測定した。具体的には、まず、ポリエチレンテレフタレート製の摩擦力試験面上に、発泡樹脂シートから切り出された8cm2のサンプルシートを、サンプルシートの表面層が当該試験面に面接触する態様で載置した。次に、載置されたサンプルシートの発泡樹脂層上に50gのおもりを載せて固定した。そして、このおもりを水平方向に300mm/minの速度で引っ張り、その時にかかる応力(kN/m2)を測定した。 <Friction force>
For each of the foamed resin sheets of Examples 1 to 4 and Comparative Examples 1 and 2, the friction force was measured using a universal tensile compression tester (trade name: TCM-1kNB, manufactured by Minebea). Specifically, first, an 8 cm 2 sample sheet cut out from the foamed resin sheet was placed on a friction test surface made of polyethylene terephthalate so that the surface layer of the sample sheet was in surface contact with the test surface. . Next, a 50 g weight was placed and fixed on the foamed resin layer of the placed sample sheet. Then, the weight was pulled in the horizontal direction at a speed of 300 mm / min, and the stress (kN / m 2 ) applied at that time was measured.
実施例1~4および比較例1,2の発泡樹脂シートのそれぞれについて、次のように追従性評価を行った。まず、平行に離隔する一対のスペーサーをガラス板上に固定することによって、ガラス板表面に段差形状を設けた。このとき、各スペーサーの端部がガラス板の縁端と面一となるようにスペーサーを配した(この縁端について後述の観察がなされる)。次に、発泡樹脂シートの表面層がガラス板に面接触する態様で、一対のスペーサーを覆うようにガラス板上に発泡樹脂シートを載置した。次に、ガラス板上の発泡樹脂シートの上に更に別のガラス板を載置した後、ガラス板間に荷重をかけた。この後、前記縁端において発泡樹脂シートの追従性を観察した。ガラス板上のスペーサー箇所に例えば図3(a)に模式的に表されるように空隙が見られなかった場合を良好(○)と評価し、ガラス板上のスペーサー箇所に例えば図3(b)に模式的に表されるように空隙Gが見られた場合を不良(×)と評価した。図3では、ガラス板41上にスペーサー42が設けられており、ガラス板41とガラス板43の間に発泡樹脂シート44が挟持されている。 <Followability>
For each of the foamed resin sheets of Examples 1 to 4 and Comparative Examples 1 and 2, follow-up evaluation was performed as follows. First, a step shape was provided on the glass plate surface by fixing a pair of spacers spaced in parallel on the glass plate. At this time, the spacers were arranged so that the end portions of the respective spacers were flush with the edge of the glass plate (the following observations were made on this edge). Next, the foamed resin sheet was placed on the glass plate so that the surface layer of the foamed resin sheet was in surface contact with the glass plate so as to cover the pair of spacers. Next, after placing another glass plate on the foamed resin sheet on the glass plate, a load was applied between the glass plates. Thereafter, the followability of the foamed resin sheet was observed at the edge. For example, when a gap is not seen in the spacer portion on the glass plate as shown schematically in FIG. 3A, it is evaluated as good (O), and the spacer portion on the glass plate is shown in FIG. ) Was evaluated as defective (x) when the gap G was seen as schematically represented. In FIG. 3, a
実施例1~4の発泡樹脂シートのそれぞれにおける表面層付き発泡樹脂層について、粘弾性測定装置(商品名:ARES 2KFRTN1-FCO,TA Instruments Japan社製)を使用して、フィルム引張り測定モードにて、角振動数1rad/sで温度分散性試験を行い、その際の損失弾性率と貯蔵弾性率の比率である損失正接(tanδ)のピークトップの温度(℃)と強度(最大値)を測定した。実施例1~4の各発泡樹脂シートの表面層付き発泡樹脂層は、損失正接のピークトップを-8℃に有した。そのピークトップ強度(最大値)は0.35であった。また、各発泡樹脂シートについて、表面層付き発泡樹脂層の見掛け密度が発泡樹脂層の上記の見掛け密度0.28g/cm3に等しいとみなして当該見掛け密度0.28g/cm3で前記ピークトップ強度0.35を割った値は、1.25である。 <Dynamic viscoelasticity>
With respect to the foamed resin layer with a surface layer in each of the foamed resin sheets of Examples 1 to 4, using a viscoelasticity measuring device (trade name: ARES 2KFRTN1-FCO, manufactured by TA Instruments Japan) in the film tension measurement mode. The temperature dispersibility test was conducted at an angular frequency of 1 rad / s, and the peak top temperature (° C.) and strength (maximum value) of the loss tangent (tan δ), which is the ratio of the loss elastic modulus and storage elastic modulus at that time, were measured. did. The foamed resin layer with a surface layer of each of the foamed resin sheets of Examples 1 to 4 had a peak top of loss tangent at −8 ° C. The peak top intensity (maximum value) was 0.35. Further, regarding each foamed resin sheet, the peak density at the apparent density of 0.28 g / cm 3 is regarded as the apparent density of the foamed resin layer with the surface layer equal to the apparent density of 0.28 g / cm 3 of the foamed resin layer. The value obtained by dividing the strength of 0.35 is 1.25.
実施例1~4の発泡樹脂シートは、いずれも、上述の再剥離性試験にて良好または許容可と評価される。これは、再剥離の際に過度に変形してしまうほど実施例1~4の発泡樹脂シートが表面層側で粘着するのではない、ことを意味する。したがって、実施例1~4の発泡樹脂シートは、意図しない付着の抑制という点で良好な取扱い性を有する薄層衝撃吸収材を実現するのに適する。また、実施例1~4の発泡樹脂シートは、いずれも、上述の摩擦力測定にて生じさせる摩擦力が10kN/m2未満であって比較的に小さい。したがって、実施例1~4の発泡樹脂シートは、貼付け過程で位置合わせしやすいという点で良好な取扱い性を有する薄層衝撃吸収材を実現するのに適する。加えて、実施例1~4の発泡樹脂シートは、いずれも、上述の追従性試験にて良好と評価される。したがって、実施例1~4の発泡樹脂シートは、優れた追従性を有する薄層衝撃吸収材を実現するのに適する。以上のように、実施例1~4の発泡樹脂シートは、良好な取扱い性を有するとともに優れた追従性を有する薄層衝撃吸収材を実現するのに適する。 [Evaluation]
Any of the foamed resin sheets of Examples 1 to 4 is evaluated as good or acceptable in the above-described removability test. This means that the foamed resin sheets of Examples 1 to 4 do not stick to the surface layer side so as to be excessively deformed during re-peeling. Therefore, the foamed resin sheets of Examples 1 to 4 are suitable for realizing a thin-layer impact absorbing material having good handleability in terms of suppressing unintended adhesion. Further, in all of the foamed resin sheets of Examples 1 to 4, the frictional force generated by the above-described frictional force measurement is less than 10 kN / m 2 and relatively small. Therefore, the foamed resin sheets of Examples 1 to 4 are suitable for realizing a thin-layer impact absorbing material having good handleability in that it can be easily aligned in the pasting process. In addition, all of the foamed resin sheets of Examples 1 to 4 are evaluated to be good in the followability test described above. Therefore, the foamed resin sheets of Examples 1 to 4 are suitable for realizing a thin-layer impact absorbing material having excellent followability. As described above, the foamed resin sheets of Examples 1 to 4 are suitable for realizing a thin-layer impact absorbing material having good handling properties and excellent followability.
10 発泡樹脂層
20 表面層
21 露出面
Y 電気・電子機器 X
Claims (16)
- 発泡樹脂層と、表面粗さが1.0μm以上の露出面を有し且つフィラーを含有する表面層と、を含む積層構造を有する、発泡樹脂シート。 A foamed resin sheet having a laminated structure including a foamed resin layer and a surface layer having an exposed surface with a surface roughness of 1.0 μm or more and containing a filler.
- 前記露出面は、ポリエチレンテレフタレート製の試験面に対して8cm2の面積で面接触した状態において前記試験面に向けての50gの荷重下で当該試験面に平行に300mm/minの速度で引っ張られたときに生ずる応力として定義される摩擦力が、10kN/m2以下である、請求項1に記載の発泡樹脂シート。 The exposed surface is pulled in parallel with the test surface at a speed of 300 mm / min under a load of 50 g toward the test surface in a state of surface contact with the test surface made of polyethylene terephthalate in an area of 8 cm 2. The foamed resin sheet according to claim 1, wherein a frictional force defined as a stress generated at the time of heating is 10 kN / m 2 or less.
- 前記摩擦力は2.0kN/m2以下である、請求項2に記載の発泡樹脂シート。 The foamed resin sheet according to claim 2, wherein the frictional force is 2.0 kN / m 2 or less.
- 前記表面粗さは1.5μm以上である、請求項1から3のいずれか一つに記載の発泡樹脂シート。 The foamed resin sheet according to any one of claims 1 to 3, wherein the surface roughness is 1.5 µm or more.
- 前記表面粗さは10μm以下である、請求項1から4のいずれか一つに記載の発泡樹脂シート。 The foamed resin sheet according to any one of claims 1 to 4, wherein the surface roughness is 10 µm or less.
- 動的粘弾性測定における角振動数1rad/sでの損失弾性率と貯蔵弾性率との比率である損失正接(tanδ)が-50~50℃の範囲にピークトップを有する、請求項1から5のいずれか一つに記載の発泡樹脂シート。 6. The loss tangent (tan δ), which is a ratio of a loss elastic modulus and a storage elastic modulus at an angular frequency of 1 rad / s in dynamic viscoelasticity measurement, has a peak top in a range of −50 to 50 ° C. The foamed resin sheet according to any one of the above.
- 前記ピークトップの強度は0.2以上である、請求項6に記載の発泡樹脂シート。 The foamed resin sheet according to claim 6, wherein the strength of the peak top is 0.2 or more.
- 前記発泡樹脂層に含まれる気泡の平均セル径は10~150μmである、請求項1から7のいずれか一つに記載の発泡樹脂シート。 The foamed resin sheet according to any one of claims 1 to 7, wherein an average cell diameter of bubbles contained in the foamed resin layer is 10 to 150 µm.
- 前記発泡樹脂層の厚さは30~200μmである、請求項1から8のいずれか一つに記載の発泡樹脂シート。 The foamed resin sheet according to any one of claims 1 to 8, wherein the thickness of the foamed resin layer is 30 to 200 µm.
- 前記発泡樹脂層に含まれる気泡の平均セル径と前記発泡樹脂層の厚さとの比(前者/後者)は0.2~0.9である、請求項1から9のいずれか一つに記載の発泡樹脂シート。 The ratio of the average cell diameter of the bubbles contained in the foamed resin layer to the thickness of the foamed resin layer (the former / the latter) is 0.2 to 0.9. Foamed resin sheet.
- 前記発泡樹脂層の見掛け密度は0.2~0.7g/cm3である、請求項1から10のいずれか一つに記載の発泡樹脂シート。 The foamed resin sheet according to any one of claims 1 to 10, wherein an apparent density of the foamed resin layer is 0.2 to 0.7 g / cm 3 .
- 前記発泡樹脂層は、アクリル系樹脂を主剤として含む、請求項1から11のいずれか一つに記載の発泡樹脂シート。 The foamed resin sheet according to any one of claims 1 to 11, wherein the foamed resin layer contains an acrylic resin as a main agent.
- 前記表面層は、ウレタン系樹脂を主剤として含む、請求項1から12のいずれか一つに記載の発泡樹脂シート。 The foamed resin sheet according to any one of claims 1 to 12, wherein the surface layer contains a urethane resin as a main agent.
- 前記フィラーは、カーボンブラックおよび/または酸化チタンである、請求項1から13のいずれか一つに記載の発泡樹脂シート。 The foamed resin sheet according to any one of claims 1 to 13, wherein the filler is carbon black and / or titanium oxide.
- 前記発泡樹脂層と前記表面層とは接している、請求項1から14のいずれか一つに記載の発泡樹脂シート。 The foamed resin sheet according to any one of claims 1 to 14, wherein the foamed resin layer and the surface layer are in contact with each other.
- 請求項1から15のいずれか一つに記載の発泡樹脂シートを備える電気・電子機器。 An electric / electronic device comprising the foamed resin sheet according to any one of claims 1 to 15.
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JP2021511975A (en) * | 2018-12-28 | 2021-05-13 | ヒューヴィス コーポレーションHuvis Corporation | Foam sheet containing skin layer, its manufacturing method and food container containing it |
JP2023528813A (en) * | 2020-08-31 | 2023-07-06 | エルジー エナジー ソリューション リミテッド | Battery module and battery pack containing same |
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TWI659837B (en) * | 2017-03-14 | 2019-05-21 | 仁寶電腦工業股份有限公司 | Decorative film structure and manufacturing method thereof |
KR102010457B1 (en) * | 2018-02-13 | 2019-08-13 | 화인케미칼 주식회사 | Composition for low density molded foam article and method of fabricating molded foam article using the same |
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JP2008207471A (en) * | 2007-02-27 | 2008-09-11 | Fp Corp | Laminate sheet for thermoforming and packaging container |
WO2013191031A1 (en) * | 2012-06-18 | 2013-12-27 | 古河電気工業株式会社 | Foamed sheet, and light reflector and backlight panel both formed using same |
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JP2023528813A (en) * | 2020-08-31 | 2023-07-06 | エルジー エナジー ソリューション リミテッド | Battery module and battery pack containing same |
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