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WO2017170794A1 - Feuille de mousse à alvéoles fermées et dispositif d'affichage - Google Patents

Feuille de mousse à alvéoles fermées et dispositif d'affichage Download PDF

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Publication number
WO2017170794A1
WO2017170794A1 PCT/JP2017/013109 JP2017013109W WO2017170794A1 WO 2017170794 A1 WO2017170794 A1 WO 2017170794A1 JP 2017013109 W JP2017013109 W JP 2017013109W WO 2017170794 A1 WO2017170794 A1 WO 2017170794A1
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WO
WIPO (PCT)
Prior art keywords
sheet
opening
closed
foam sheet
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2017/013109
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English (en)
Japanese (ja)
Inventor
秀明 矢野
彰人 土肥
慶人 菱沼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
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Sekisui Chemical Co Ltd
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Priority to JP2017520990A priority Critical patent/JP6921742B2/ja
Publication of WO2017170794A1 publication Critical patent/WO2017170794A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C08J9/04—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
    • C08J9/06—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 chemical blowing agent
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements

Definitions

  • the present invention relates to a closed cell foam sheet and a display device.
  • the front plate composed of a glass plate, an acrylic plate or the like disposed on the front side of the display device, and the display panel are also reduced in thickness.
  • the front plate and the display panel are easily broken.
  • an impact absorbing sheet is disposed over the entire rear surface of the display panel or on the periphery in order to prevent damage and failure of the display device due to repeated impacts in everyday life. It is known.
  • the impact-absorbing sheet is required to have high flexibility in order to obtain impact-absorbing properties against repeated impacts, and foamed sheets are widely used.
  • foamed sheets for example, as described in Patent Document 1, a polyethylene-based crosslinked foamed sheet containing a large number of closed cells is known.
  • urethane foam sheets, rubber foam sheets, and the like are also used.
  • a touch panel type is often adopted as a display device of a portable device such as the above-mentioned smartphone.
  • liquid crystal bleeding may occur when the pressure during the operation becomes strong.
  • the display device may be repeatedly pressed at a high speed with a strong force, and pooling may be conspicuous at that time, and there is an increasing demand for suppressing pooling.
  • the foam sheet used in the display device is required not only to have a high impact absorbability against an impact repeatedly applied in daily life, but also to have a property of eliminating pooling at an early stage (that is, pooling resistance). It has become.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a foam sheet having not only high shock absorption but also excellent pooling resistance, and a display device including the same. That is.
  • this invention provides the following foam sheet and a display apparatus provided with the same.
  • An opening and bubbles having an average bubble diameter of 25 to 330 ⁇ m in MD and TD, and a minimum width of a portion other than the opening is an average bubble diameter in MD and an average bubble diameter in TD
  • a display device comprising the closed-cell foamed sheet according to [1] and a display panel.
  • the present invention provides a foam sheet having not only high shock absorption but also excellent pooling resistance, and a display device including the same.
  • the numerical values “above” and “below” related to the description of numerical ranges are numerical values that can be arbitrarily combined.
  • the numerical range indicated by using “to” indicates a range including the numerical values described before and after “to” as the minimum value and the maximum value, respectively, The value and the maximum value may be arbitrarily combined.
  • the closed-cell foamed sheet of the present invention (hereinafter also simply referred to as “foamed sheet”) has an opening and a bubble having an average bubble diameter of 25 to 330 ⁇ m in MD and TD, and a portion other than the opening Is a foam sheet having a minimum width of 1.5 to 60 times the average bubble diameter of the larger average bubble diameter in MD and the average bubble diameter in TD.
  • an opening part means the through-hole penetrated from the one surface side of a foam sheet to the other surface side.
  • % Compressive strength can be reduced to obtain high shock absorption and excellent pooling resistance. More specifically, by providing an opening on the foamed sheet, the 25% compressive strength of the foamed sheet itself is reduced and softened moderately, and high impact absorption is obtained. By setting the minimum width in the portion and the average bubble diameter of the bubbles to have a predetermined relationship, the stress generated during the operation of the display device is relieved and excellent pooling resistance is obtained.
  • the shape of the opening viewed from the top of the sheet is not particularly limited, but is substantially square such as a square, a rectangle, a parallelogram, a trapezoid, and a similar shape, Circular, elliptical, and similar circular shapes, straight and curved lines, regular triangles, right-angled isosceles triangles, and similar triangular shapes, other pentagons, hexagons, and this It is possible to appropriately select and use a substantially polygonal shape such as a shape similar to the above and a combination of these. Moreover, as a kind of shape, you may use independently and may use it in combination of multiple types. For example, a substantially square opening may exist alone, a substantially square opening and a circular opening may exist simultaneously, or a square opening and a rectangular opening are different. A square opening may be present at the same time.
  • the width of the opening is preferably 0.1 to 2 mm, more preferably 0.3 to 1.5 mm, and still more preferably 0.4 to 1 mm.
  • the width is within the above range, impact absorption and pooling resistance are improved, and the opening is easily processed.
  • this linear opening part exists over at least 2 area
  • the length of one side is preferably 0.1 to 4.5 mm, more preferably 0.2 to 3 mm, still more preferably 0.3 to 2 mm, and 0.5 to 1. 5 mm is particularly preferable. Further, the length of one side is preferably 2 to 90% as a ratio with respect to the length of one side of the entire sheet (the length of one side of the circumscribed rectangle when the sheet shape is not a square). A length of 60% is more preferred, and a length of 15-40% is even more preferred.
  • the shape of the opening is a linear shape or a shape other than a substantially square shape, that is, a substantially circular shape, a substantially triangular shape, a substantially polygonal shape, or the like, it is preferable that the size be inscribed in the substantially rectangular shape.
  • the area ratio of the openings on the entire surface of the sheet is preferably 1 to 90%, more preferably 1 to 85%. When the area ratio is 1 to 85%, the impact absorption and pooling resistance are further improved. Further, from the same viewpoint, when the shape of the opening is linear, the area ratio of the opening is more preferably 3 to 50%, and further preferably 5 to 30%. When the shape of the opening is not linear, the area ratio of the opening is more preferably 10 to 80%, further preferably 20 to 70%.
  • the minimum width in the portion other than the opening is the smallest length between the periphery of the opening and the periphery of the sheet when there is one opening (hereinafter referred to as “the length between the openings”).
  • the length between the opening sheets is the smallest, and between the periphery of one opening and the periphery of the other opening.
  • Means the shortest one of the shortest lengths (hereinafter sometimes referred to as “length between openings”). When these lengths are the same, any length may be used.
  • the minimum width is 1.5 to 60 with respect to the average bubble diameter of the larger average bubble diameter in MD and the average bubble diameter in TD (hereinafter, sometimes simply referred to as “average bubble diameter”). It needs to be double.
  • the opening and setting the minimum width of the portion other than the opening within a predetermined range in relation to the average bubble diameter high shock absorption and excellent pooling resistance can be obtained.
  • the closed cell foam of the present invention it is preferable to have at least two openings from the viewpoint of further improving shock absorption and pooling resistance.
  • the width between the openings is an average in MD It is preferable to have a plurality of portions that are 1.5 to 60 times larger than the larger bubble diameter and the average bubble diameter in TD.
  • the width between the openings is synonymous with the length between the openings.
  • the minimum width is preferably 2 to 50 times, more preferably 5 to 40 times, and even more preferably 10 to 30 times the average bubble diameter.
  • the absolute value of the minimum width is not particularly limited as long as the above relationship with respect to the average bubble diameter is satisfied. For example, 0.1 to 250 mm is preferable, 0.5 to 200 mm is more preferable, and 1 to 150 mm is more preferable.
  • FIG. 1 shows an example of an embodiment of the foam sheet of the present invention.
  • the embodiment shown in FIG. 1 is merely an example, and the foam sheet of the present invention is not limited to the embodiment shown in FIG.
  • Each mode shown in FIG. 1 has various patterns of openings having various opening shapes, and assumes a square sheet having a side of 5 cm.
  • the sheet 1-a has a square opening in the sheet and has a frame shape.
  • the opening is a square with a side of 4 cm, and the minimum width is the smallest length between the sheets of the opening, that is, the width of the frame portion is 0.5 cm.
  • the area of the opening is 16 cm 2, and the area ratio of the opening to the entire sheet is 64%.
  • the opening is in the center of the sheet, but if the minimum width is in the range of 1.5 to 60 times the average bubble diameter, the opening It may be biased to either side.
  • the 1-b sheet has a plurality of (16) square openings in the sheet, which are evenly arranged vertically and horizontally in a lattice pattern.
  • the opening is a square with a side of 1 cm, and the smallest length between the openings and the smallest length between the sheets between the openings are equal to each other, and both are 0.2 cm, so the minimum width is 0. .2cm. Further, the area ratio of the opening to the entire sheet surface is 64%.
  • the opening portion is square in the 1-b sheet, the portion that maintains the minimum width is continued.
  • the square opening portion in the 1-b sheet is formed. It may be replaced with an inscribed circular shape or an opening having another shape.
  • a zigzag pattern or the like as shown in 1-c may be used. If the openings are 60 ° zigzag, the length between the openings of adjacent openings is the smallest. All are the same.
  • the area ratio of the opening of the 1-c sheet to the entire sheet surface is 44%. Further, the arrangement in a zigzag pattern is not limited to the case where the openings are circular, but may be openings having other shapes.
  • the 1-d sheet has a plurality of circular openings. 1 and 2, 2 and 4, 6 and 7, 6 and 8 (number of each opening) are arranged so that the length between each opening is 2 mm.
  • the opening is a circle having a diameter of 1 cm (a circle inscribed in a square having a side of 1 cm), and has eight circular openings and two semicircular openings. Thus, the opening may be a semicircle or may be irregularly arranged.
  • the minimum width of the 1-d sheet is 2 mm which is the length between the openings of 1 and 2, 2 and 4, 6 and 7, and 6 and 8.
  • the length between the openings of 1 and 6, 2 and 3, 4 and 5, 4 and 7, or 1 and 4, 3 and 4, 3 and 5, 4 and 6, 5 and 7, and 7 and 8 Is not the minimum width, but depending on the average bubble diameter, the length may fall within the range of 1.5 to 60 times the average bubble diameter.
  • the portion where the length between the openings or the length between the sheets of the opening falls within the range of 1.5 to 60 times the average cell diameter is shock-absorbing.
  • the length between the openings or the length between the openings is in the range of 1.5 to 60 times the average bubble diameter
  • the area ratio of the portion to the entire sheet surface is preferably 5 to 70%, more preferably 5 to 60%, and still more preferably 10 to 50%.
  • the 1-e sheet has a plurality of linear openings so as to penetrate the sheet in the vertical direction.
  • this sheet can also be said to be an assembly of strip-shaped sheets
  • the foamed sheet of the present invention includes such an embodiment in which the opening does not stay in the periphery of the sheet but reaches the periphery.
  • the 1-e sheets are strip-shaped sheets having a width of 9.2 mm and a length of 5 cm arranged at equal intervals of 1 mm.
  • the minimum width is the same as the length between the opening portions and the smallest length between the opening portion sheets, and is 9.2 mm which is the width of the strip-shaped sheet.
  • the area ratio of the opening to the entire sheet surface is 8%.
  • the 1-e sheet is suitably used as an impact absorbing material disposed on the back side of the display panel, which will be described later.
  • the 1-e sheet is suitably used as an impact absorbing material disposed on the back side of the display panel, which will be described later.
  • the 1-f sheet has a plurality of straight openings.
  • the left and right openings are arranged so that the length between the opening sheets is 5 mm, the length between the right opening and the middle opening is 1.5 cm, and the left opening
  • the length between the openings of the middle opening is 2.1 cm.
  • the width of each opening is 1 mm, the length is 3 cm, and the area ratio of the opening to the entire sheet surface is 3.6%.
  • the minimum width of the 1-f sheet is 5 mm, which is the length between the opening sheets of the left and right openings.
  • the width is not the minimum, the length between the opening of the right opening and the middle opening is 1.5 cm. Therefore, depending on the average bubble diameter, it is 1.5 to 60 times the average bubble diameter. May be in range. In this case, the portion that falls within the range of 1.5 to 60 times the average bubble diameter can improve the impact absorbability and the pooling resistance. Pooling resistance is further improved.
  • the length between the opening of the left opening and the middle opening is 2.1 cm, even when the average bubble diameter is 330 ⁇ m, which is the maximum value of 30 to 330 ⁇ m, the average bubble diameter of 60 ⁇ m. Since the length exceeds twice, high shock absorption and excellent pooling resistance cannot be obtained only by the portion sandwiched between these openings. However, the portion sandwiched between the left opening and the periphery of the seat, the portion sandwiched between the right opening and the periphery of the seat, and depending on the size of the average bubble diameter, the right opening and the middle opening The part sandwiched between the parts expresses shock absorption and pooling resistance.
  • the area ratio of the portion having these performances to the entire sheet surface is as described above.
  • the 1-g sheet has a plurality of S-shaped curved openings.
  • the minimum width is 2 mm at the portion where the curves of the first opening and the second opening from the left are switched.
  • the length between the opening sheets for the leftmost opening, the length between the openings of each other opening, and the length between the opening sheets for the rightmost opening also have a portion of 5 mm or less. Although these portions are not the minimum values, depending on the average bubble diameter, they may fall within the range of 1.5 to 60 times the average bubble diameter.
  • the upper left and lower right of the 1-g sheet have a wide portion where there is no opening. However, depending on the average bubble diameter, the average bubble diameter of 1. Since it is compensated by the portion within the range of 5 to 60 times, the entire sheet can have high impact absorption and pooling resistance.
  • the 1-h sheet has a plurality of S-shaped curved openings and one circular opening.
  • the foamed sheet of the present invention may have openings with different shapes.
  • the foamed sheet of the present invention is a closed cell foamed sheet composed of closed cells.
  • the closed cell means that the closed cell rate is 70% or more. That is, the bubbles included in the foam sheet are generally closed cells. From the viewpoint of improving impact absorption and pooling resistance, the closed cell ratio is preferably 90 to 100%, more preferably 95 to 100%.
  • Open cell ratio F 1 (%) 100 ⁇ (W 2 ⁇ W 1 ) / V 2
  • Closed cell ratio F 2 (%) 100 ⁇ F 1
  • the repulsive force against the pressure is large, so that it is generally effective for the expression of pooling resistance.
  • the repulsive force is too large, the impact absorbability may decrease, and it can be said that the impact absorbability and the pooling resistance are contradictory.
  • the shock absorption can be improved, and the anti-pooling property can be improved especially by making the predetermined relationship between the minimum width in the part other than the opening and the average bubble diameter. It was.
  • the 25% compressive strength of the foamed sheet is preferably 40 to 200 kPa, more preferably 50 to 180 kPa, and even more preferably 60 to 170 kPa for the foamed sheet before the opening is provided.
  • the 25% compressive strength of the foamed sheet of the present invention after the opening is provided is preferably 3 to 90 kPa.
  • 15 to 90 kPa is preferable, 3 to 70 kPa is preferable, 20 to 80 kPa is more preferable, and 30 to 70 kPa is still more preferable.
  • the reduction rate of the 25% compressive strength before and after providing the recesses is preferably 15 to 80%, more preferably 30 to 75%, and still more preferably 50 to 70%.
  • the foamed sheet of the present invention is provided with an opening, whereby the compressive strength is reduced by 25% in spite of being closed cells, and the impact absorption and the pooling resistance are improved.
  • the 25% compressive strength is a value measured according to JIS K 6767.
  • the thickness of the foam sheet is preferably 0.03 to 0.6 mm, considering the thickness desired for use in a display device, the ease of obtaining shock absorption and pooling resistance, and the like, preferably 0.05 to 0 mm. 0.5 mm is more preferable, and 0.06 to 0.3 mm is even more preferable.
  • the density of foam sheet, shock absorption, in view of improving the resistance to pooling resistance preferably 60 ⁇ 600kg / m 3, preferably 60 ⁇ 400kg / m 3, more preferably 150 ⁇ 600kg / m 3, 180 ⁇ 480kg / M 3 is more preferable.
  • the average cell diameter of bubbles in the foamed sheet is preferably 25 to 330 ⁇ m, more preferably 30 to 330 ⁇ m, in MD and TD. More specifically, MD is preferably 25 to 300 ⁇ m, more preferably 35 to 230 ⁇ m, and still more preferably 50 to 180 ⁇ m. In TD, 30 to 330 ⁇ m is preferable, 50 to 300 ⁇ m is more preferable, and 60 to 250 ⁇ m is still more preferable. Further, ZD is preferably 10 to 80 ⁇ m, more preferably 15 to 75 ⁇ m, still more preferably 20 to 70 ⁇ m. When the average bubble diameter of the bubbles is within the above range, impact absorbability and pooling resistance can be improved.
  • the foam sheet is obtained by crosslinking and foaming a resin sheet of a resin material described later.
  • the degree of crosslinking of the foamed sheet is usually about 5 to 60% by mass, preferably 10 to 40% by mass.
  • the raw material resin constituting the closed-cell foamed sheet of the present invention may be, for example, any of polyolefin resin, acrylic resin, silicone resin, urethane resin, rubber resin, and shock absorption and anti-pooling Considering the properties, it is preferable to use a polyolefin resin.
  • the polyolefin resin which is a preferable material in the present invention, will be described.
  • the polyolefin resin used to form the foamed sheet include a polyethylene resin, a polypropylene resin, or a mixture thereof.
  • polyethylene is a polyethylene resin from the viewpoint of improving impact absorption and pooling resistance. Based resins are preferred. More specifically, examples thereof include polyethylene resins, polypropylene resins, or mixtures thereof polymerized with a polymerization catalyst such as a Ziegler-Natta compound, a metallocene compound, and a chromium oxide compound. Among these, polymerization of a metallocene compound is included. A polyethylene resin polymerized with a catalyst is preferred.
  • the polyethylene resin may be an ethylene homopolymer, but by copolymerizing ethylene with a small amount (for example, 30% by mass or less of the total monomers, preferably 1 to 10% by mass) of ⁇ -olefin as necessary. Polyethylene resins obtained are preferred, and among them, linear low density polyethylene is preferred.
  • a polyethylene-based resin particularly a linear low density polyethylene, obtained by a polymerization catalyst of a metallocene compound, it becomes easy to obtain a foamed sheet having improved flexibility, mechanical strength, and pooling resistance. Moreover, as will be described later, it is easy to maintain high performance even if the foam sheet is thin.
  • ⁇ -olefin constituting the polyethylene resin examples include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, and 1-octene. . Of these, ⁇ -olefins having 4 to 10 carbon atoms are preferred.
  • the polyethylene resin an ethylene-vinyl acetate copolymer is also preferably used.
  • the ethylene-vinyl acetate copolymer is usually a copolymer containing 50% by mass or more of ethylene units.
  • the polyethylene resin, the ethylene-vinyl acetate copolymer, or a mixture thereof obtained by the polymerization catalyst of the metallocene compound is preferably contained in the foamed sheet in an amount of 50% by mass or more, more preferably 60% by mass. As described above, it is most preferably contained by 100% by mass.
  • polypropylene resin examples include a propylene homopolymer, a propylene- ⁇ -olefin copolymer containing 50% by mass or more of a propylene unit, and the like. These may be used alone or in combination of two or more.
  • Specific examples of the ⁇ -olefin constituting the propylene- ⁇ -olefin copolymer include ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1- Among these, ⁇ -olefins having 6 to 12 carbon atoms are preferable.
  • Suitable metallocene compounds include compounds such as bis (cyclopentadienyl) metal complexes having a structure in which a transition metal is sandwiched between ⁇ -electron unsaturated compounds. More specifically, tetravalent transition metals such as titanium, zirconium, nickel, palladium, hafnium, and platinum have one or more cyclopentadienyl rings or their analogs as ligands (ligands). The compound to be mentioned is mentioned. Such metallocene compounds have uniform active site properties and each active site has the same activity. A polymer synthesized using a metallocene compound has high uniformity such as molecular weight, molecular weight distribution, composition, and composition distribution.
  • Examples of the ligand include a cyclopentadienyl ring and an indenyl ring. These cyclic compounds may be substituted with a hydrocarbon group, a substituted hydrocarbon group or a hydrocarbon-substituted metalloid group.
  • Examples of the hydrocarbon group include a methyl group, an ethyl group, various propyl groups, various butyl groups, various amyl groups, various hexyl groups, 2-ethylhexyl groups, various heptyl groups, various octyl groups, various nonyl groups, and various decyl groups. , Various cetyl groups, phenyl groups and the like.
  • the “various” means various isomers including n-, sec-, tert-, and iso-. Moreover, what polymerized the cyclic compound as an oligomer may be used as a ligand. In addition to ⁇ -electron unsaturated compounds, monovalent anion ligands such as chlorine and bromine or divalent anion chelate ligands, hydrocarbons, alkoxides, arylamides, aryloxides, amides, arylamides, phosphides, aryls Phosphide or the like may be used.
  • monovalent anion ligands such as chlorine and bromine or divalent anion chelate ligands, hydrocarbons, alkoxides, arylamides, aryloxides, amides, arylamides, phosphides, aryls Phosphide or the like may be used.
  • metallocene compounds containing tetravalent transition metals and ligands include, for example, cyclopentadienyl titanium tris (dimethylamide), methylcyclopentadienyl titanium tris (dimethylamide), bis (cyclopentadienyl) titanium dichloride, dimethyl And silyltetramethylcyclopentadienyl-t-butylamidozirconium dichloride.
  • the metallocene compound exhibits an action as a catalyst in the polymerization of various olefins by combining with a specific cocatalyst (co-catalyst).
  • specific cocatalyst include methylaluminoxane (MAO) and boron compounds.
  • the proportion of the cocatalyst used with respect to the metallocene compound is preferably 100,000 to 1,000,000 mole times, more preferably 50 to 5,000 mole times.
  • the Ziegler-Natta compound is a triethylaluminum-titanium tetrachloride solid composite, which is obtained by reducing titanium tetrachloride with an organoaluminum compound and then treating with various electron donors and electron acceptors.
  • a method of combining a composition, an organoaluminum compound, and an aromatic carboxylic acid ester see JP-A 56-1000080, JP-A 56-120712, JP-A 58-104907), halogens Method of supported catalyst in which magnesium tetrachloride is brought into contact with magnesium tetrachloride and various electron donors (see JP-A-57-63310, JP-A-63-43915, JP-A-63-83116), etc. What was manufactured by is preferable.
  • the polyethylene resin preferably has a low density in order to increase the flexibility, mechanical strength, and recovery rate of the foam sheet.
  • the density of the polyethylene resin is preferably 0.920 g / cm 3 or less, more preferably 0.880 to 0.915 g / cm 3 , still more preferably 0.885 to 0.910 g / cm 3. It is. The density is measured according to ASTM D792.
  • polyolefin resin resin other than the above-mentioned polyolefin resin can also be used, and resin other than polyethylene resin and polypropylene resin may be used by further mixing with polyethylene resin and polypropylene resin.
  • the polyolefin resin may be mixed with various additives and other components described later, and the foamed sheet is obtained by crosslinking and foaming a polyolefin resin containing additives and other components. Is preferred.
  • other components contained in the foamed sheet include resins and rubbers other than polyolefin-based resins, and these are total and less in content than polyolefin-based resins, and are usually based on 100 parts by mass of polyolefin-based resin. It is about 50 parts by mass or less, preferably about 30 parts by mass or less.
  • the method for producing the foamed sheet of the present invention is not particularly limited, and examples thereof include a method including the following steps (1) to (5).
  • Step (1) Melting resin materials such as raw resin, additives such as pyrolytic foaming agent, and other additives added as necessary, at a temperature lower than the decomposition temperature of the pyrolytic foaming agent, Step of kneading and molding into a resin sheet by a known molding method
  • Step (2) Step of crosslinking the resin sheet obtained in step (1)
  • Step (5) Step of forming an opening in the stretched resin sheet
  • the above steps (1) to (5) are performed in this step. Although it may be performed in order, it is not always necessary to perform in this order of the process. For example, the process (3) may be performed after the process (4). Moreover, two processes may be performed simultaneously, for example, you may perform process (3) and (4) simultaneously
  • a raw material resin, additives such as a pyrolytic foaming agent, and resin materials such as other additives are supplied to an extruder such as a single screw extruder or a twin screw extruder, etc.
  • the resin material is made into a sheet-like resin sheet by melting and kneading at a temperature lower than the decomposition temperature of the decomposable foaming agent and extruding by extrusion molding or the like.
  • examples of the additive other than the thermal decomposition type foaming agent include a decomposition temperature adjusting agent, a crosslinking aid, an antioxidant, a cell nucleating agent, a colorant, a flame retardant, an antistatic agent, a filler, and the like.
  • the raw material resin may be a polyolefin resin as described above, but may be a mixture of a polyolefin resin and a resin component other than the polyolefin resin, or may be a resin component other than the polyolefin resin.
  • thermally decomposable foaming agent for example, one having a decomposition temperature higher than the melting temperature of the raw material resin can be used.
  • an organic or inorganic chemical foaming agent having a decomposition temperature of 160 to 270 ° C. can be used.
  • organic foaming agent examples include azo compounds such as azodicarbonamide, metal salts of azodicarboxylic acid (such as barium azodicarboxylate) and azobisisobutyronitrile; nitroso compounds such as N, N′-dinitrosopentamethylenetetramine; And hydrazine derivatives such as hydrazodicarbonamide, 4,4′-oxybis (benzenesulfonylhydrazide) and toluenesulfonylhydrazide; and semicarbazide compounds such as toluenesulfonyl semicarbazide.
  • azo compounds such as azodicarbonamide, metal salts of azodicarboxylic acid (such as barium azodicarboxylate) and azobisisobutyronitrile
  • nitroso compounds such as N, N′-dinitrosopentamethylenetetramine
  • hydrazine derivatives such as hydrazodicarbonamide
  • the inorganic foaming agent examples include ammonium acid, sodium carbonate, ammonium hydrogen carbonate, sodium hydrogen carbonate, ammonium nitrite, sodium borohydride, anhydrous monosodium citrate, and the like.
  • azo compounds and nitroso compounds are preferable from the viewpoint of obtaining fine bubbles, and from the viewpoints of economy and safety, and azodicarbonamide, azobisisobutyronitrile, N, N′-dinitrosopentamethylene. Tetramine is more preferred, and azodicarbonamide is still more preferred.
  • These pyrolyzable foaming agents are used alone or in combination. be able to
  • the amount of the pyrolytic foaming agent added is preferably 1 to 10 parts by weight, more preferably 1.5 to 5 parts by weight, and more preferably 1.5 to 3 parts by weight with respect to 100 parts by weight of the raw material resin (for example, polyolefin resin). Part is more preferred.
  • the decomposition temperature adjusting agent that can be used as another additive is blended to lower the decomposition temperature of the pyrolytic foaming agent, or to increase or adjust the decomposition rate.
  • Specific examples of the compound include zinc oxide, zinc stearate, urea and the like.
  • 0.01 to 5 parts by mass of the decomposition temperature regulator is blended with respect to 100 parts by mass of the raw material resin in order to adjust the surface state of the foam sheet.
  • crosslinking aid examples include polyfunctional monomers.
  • crosslinking aid examples include trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, trimellitic acid triallyl ester, 1,2,4-benzenetricarboxylic acid triallyl ester, triallyl isocyanurate, and the like.
  • Compounds having three functional groups in the molecule; two compounds in one molecule such as 1,6-hexanediol dimethacrylate, 1,9-nonanediol dimethacrylate, 1,10-decanediol dimethacrylate, divinylbenzene, etc.
  • the addition amount of the crosslinking aid is preferably 0.2 to 10 parts by mass, more preferably 0.3 to 5 parts by mass, and still more preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the raw material resin.
  • the addition amount is 0.2 parts by mass or more, it is possible to stably obtain the desired degree of crosslinking of the foam sheet, and when it is 10 parts by mass or less, the degree of crosslinking of the foam sheet is easily controlled.
  • antioxidants examples include phenolic antioxidants such as 2,6-di-t-butyl-p-cresol.
  • step (2) the resin sheet obtained in step (1) is crosslinked.
  • Crosslinking in the step (2) is preferably performed by irradiating the resin sheet with ionizing radiation.
  • the ionizing radiation include ⁇ -rays, ⁇ -rays, ⁇ -rays, and electron beams, and electron beams are more preferable.
  • the amount of ionizing radiation applied to the resin sheet is preferably 1 to 10 Mrad, more preferably 1.5 to 8 Mrad.
  • the irradiation amount of ionizing radiation is preferably 0.3 to 8 Mrad, more preferably 0.5 to 5.5 Mrad.
  • the irradiation amount of ionizing radiation By setting the irradiation amount of ionizing radiation to the above lower limit value or more, it becomes easy to impart a shear viscosity necessary for foaming the resin sheet. Moreover, by setting it as the said upper limit or less, the shear viscosity of a resin sheet does not become high too much, but foamability becomes favorable. Therefore, it becomes easy to obtain the above-described density foam sheet, and the appearance of the foam sheet is also improved.
  • the degree of progress of crosslinking is usually influenced by the raw material resin, the type of additives, etc., the irradiation dose of ionizing radiation is usually adjusted while measuring the degree of crosslinking so that the degree of crosslinking described above is obtained. To.
  • step (3) the resin sheet is heated to a temperature equal to or higher than the decomposition temperature of the thermally decomposable foaming agent and foamed.
  • this process (3) is implemented after the said process (2).
  • the temperature at which foaming is carried out depends on the decomposition temperature of the pyrolytic foaming agent, but is usually from 140 to 300 ° C, preferably from 160 to 260 ° C.
  • the method for foaming the resin sheet is not particularly limited, and examples thereof include a method of heating with hot air, a method of heating with infrared rays, a method using a salt bath, a method using an oil bath, and the like. Good.
  • step (4) the resin sheet is stretched.
  • Stretching may be performed after foaming the resin sheet, or may be performed while foaming the resin sheet.
  • the stretching may be performed with a known apparatus such as a uniaxial stretching machine or a biaxial stretching machine.
  • stretching after making a resin sheet foam it is better to continue extending
  • crosslinking agents such as an organic peroxide
  • organic peroxides include 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, and the like.
  • the addition amount of the organic peroxide is preferably 0.01 to 5 parts by mass, more preferably 0.1 to 3 parts by mass with respect to 100 parts by mass of the raw material resin.
  • the addition amount of the organic peroxide is within the above range, crosslinking of the resin material is likely to proceed, and the amount of decomposition residue of the organic peroxide in the foamed sheet is suppressed.
  • the resin material may be foamed by gas foaming typified by carbon dioxide gas or butane gas instead of using the foaming agent, or may be foamed by a mechanical floss method.
  • an opening is formed in the foamed sheet obtained by stretching the resin sheet.
  • the opening penetrates from one surface side of the foam sheet to the other surface side.
  • the method for forming the opening is not particularly limited.
  • the opening can be formed by using a punching die or the like.
  • the present invention also includes the following aspects of the invention.
  • [3] having two or more openings and bubbles having an average bubble diameter of 25 to 330 ⁇ m in MD and TD, and the length between the openings is large in average bubble diameter in MD and average bubble diameter in TD
  • a closed cell foam sheet having a length 1.5 to 60 times the average cell diameter.
  • Such a closed-cell foamed sheet has excellent impact absorption and excellent pooling resistance.
  • the foamed sheet preferably has 3 or more openings, more preferably 4 or more openings.
  • the upper limit of the number of openings is not particularly limited, but is preferably 100 or less, more preferably 50 or less.
  • the length between the openings is preferably 2 to 50 times, more preferably 5 to 40 times, and more preferably 10 to 30 times the average bubble size of the larger average bubble size in MD and the average bubble size in TD. Is more preferable.
  • Another aspect of the invention is the following invention [4].
  • An opening and bubbles having an average bubble diameter of 25 to 330 ⁇ m in MD and TD, and a reduction rate (f ⁇ ) of 25% compression strength defined by the following formula is 15 to 80% Closed cell foam sheet.
  • f ⁇ (f 0 ⁇ f 1 ) / f 0 ⁇ 100
  • f ⁇ Reduction rate of 25% compression strength (%)
  • f 0 25% compressive strength (kPa) of the foamed sheet before the opening is provided
  • f 1 25% compressive strength (kPa) of the foamed sheet after the opening is provided
  • Such a closed-cell foamed sheet has excellent impact absorption and excellent pooling resistance.
  • the reduction rate of 25% compressive strength is preferably 30 to 75%, more preferably 50 to 70%.
  • the 25% compressive strength of the foamed sheet is preferably 40 to 200 kPa, more preferably 50 to 180 kPa, and even more preferably 60 to 170 kPa for the foamed sheet before the opening is provided.
  • the 25% compressive strength of the foamed sheet of the present invention after the opening is provided is preferably 3 to 90 kPa. Furthermore, 15 to 90 kPa is preferable, 3 to 70 kPa is preferable, 20 to 80 kPa is more preferable, and 30 to 70 kPa is still more preferable.
  • the foamed sheet of the present invention can be used as it is, but may be used by providing a pressure-sensitive adhesive layer on any one or both sides.
  • the thickness of the pressure-sensitive adhesive layer is preferably 5 to 200 ⁇ m, more preferably 7 to 150 ⁇ m.
  • an adhesive which comprises the adhesive layer provided in one side or both surfaces of a foam sheet For example, an acrylic adhesive, a urethane type adhesive, a rubber-type adhesive, etc. are mentioned.
  • a method of providing the pressure-sensitive adhesive layer on the foamed sheet for example, a method of applying the pressure-sensitive adhesive using a coating machine such as a coater on at least one surface of the foamed sheet, or using a spray on at least one surface of the foamed sheet Examples thereof include a method of spraying and applying an adhesive, and a method of applying an adhesive using a brush on one surface of a foam sheet.
  • the foam sheet of the present invention can be used, for example, as a shock absorber for a display panel such as a liquid crystal panel.
  • the shock absorber of the display panel is disposed on the back side of the display panel, and absorbs the shock applied to the display panel to prevent the display panel from being damaged or broken. Since the foamed sheet of the present invention has a shock absorbing property and a pooling resistance, it is arranged as a shock absorbing material on the back side of the display panel, so that the occurrence of pooling caused by pressing the surface of the display panel is prevented. Can also be prevented.
  • the foam sheet of the present invention can also be used as an adhesive for bonding a front plate such as an acrylic plate or a glass plate, or a touch panel provided on the front plate and the main body of the display device.
  • the foam sheet can be used by providing an opening so as to have a frame shape, or cut into a desired shape, for example, a strip shape.
  • the foamed sheet of the present invention is used as an adhesive, since the foamed sheet is a closed cell body and the bubbles are not in communication, a gap generated between the frame and the front plate when stress is applied to the frame. It is also possible to suppress entry of dust, moisture, etc. from Moreover, the effect which suppresses the failure
  • the display panel, the shock absorbing material, the front plate, the touch panel, and the adhesive constituting the display device will be described later.
  • the display device of the present invention includes the closed-cell foamed sheet of the present invention and a display panel, and the foamed sheet of the present invention is suitably used for the impact absorbing material 13 described later.
  • An example of the display device of the present invention will be described with reference to FIG.
  • a display device 10 shown in FIG. 2 includes a display panel 11, a front plate 12 provided on the front side of the display panel 11, an adhesive 16 that bonds the front plate 12 and the frame 15, and a rear side of the display panel 11.
  • the shock absorbing material 13 and the like are provided.
  • the display panel 11 is a unit that is disposed on the shock absorber 13 and includes at least a display element such as a liquid crystal display element or an organic EL display element in which a liquid crystal layer is disposed between two glass substrates. However, in addition to the display element, a protective film, a polarizing element, a retardation film, or the like may be laminated.
  • the display panel 11 further includes a backlight unit provided on the back side of the display element when the display element is a liquid crystal display element.
  • the display panel 11 preferably includes a liquid crystal display element.
  • the front plate 12 includes a cover plate material for protecting the display panel 11 and the like.
  • plate material will not be specifically limited if it has a light transmittance, An acrylic board, a glass plate, etc. are mentioned.
  • the front plate 12 may further include a member other than the cover plate material.
  • a touch panel unit (not shown) is laminated on the lower surface side of the cover plate material. It may be.
  • the impact absorbing material 13 is provided to absorb the impact when the impact is applied to the display panel 11 and the front plate 12, and a foam sheet is usually used.
  • a foam sheet is usually used.
  • the closed cell foamed sheet of the present invention having high impact absorbability is preferably used.
  • the use of the foamed sheet as the shock absorbing material 13 can also prevent the occurrence of pooling caused by pressing the display panel 11 through the front plate 12. .
  • the front plate 12 is supported by the frame 15.
  • the frame 15 has a quadrangular frame shape and is provided with a fitting portion 15 ⁇ / b> A having a lower inner peripheral side height.
  • the front plate 12 is disposed so as to be fitted to the fitting portion 15A.
  • the front plate 12 is fixed to the frame 15 by being bonded to the fitting portion 15A by the adhesive 16 arranged in the fitting portion 15A.
  • the adhesive 16 a double-sided tape or the like in which a pressure-sensitive adhesive layer is provided on both surfaces of a base material is used.
  • the base material of this double-sided tape the foamed sheet of the present invention may be used.
  • the display panel 11 is bonded to the back surface of the front plate 12 through the adhesive layer 17, and thereby is integrated with the front plate 20 and supported by the frame 15.
  • the adhesive layer 17 is composed of an adhesive layer having optical transparency called OCA (Optically Clear Adhesive) or an adhesive layer.
  • a plate 18 arranged with a certain distance from the display panel 11 is provided on the back side of the display panel 11.
  • the plate 18 is fixed to the frame 15.
  • a foam sheet 13 is disposed on the surface of the plate 18. A clearance may be provided between the foam sheet 13 and the display panel 11.
  • the display device of the present invention is suitably provided in a portable device such as a notebook personal computer, a mobile phone, a smartphone, or a tablet.
  • the display device of the present invention may be a touch panel type including a touch panel unit. Although the surface of the touch panel is repeatedly pressed at a high speed, when the foam sheet of the present invention is used as the shock absorber 13, the occurrence of pooling is suppressed, so that the display performance of the display device is improved.
  • the display device of the present invention has been described with reference to FIG. 2, the display device shown in FIG. 2 shows an example of the display device of the present invention, and various modifications can be made.
  • the display panel 11 and the front plate 12 may be supported by a member other than the frame 15, and the shock absorber 13 may be disposed on a member other than the plate 18.
  • the material used for each member is only an example, and materials made of materials usually used for these members can be used.
  • ⁇ Average bubble diameter> The foamed sheet is cut into a 50mm square, immersed in liquid nitrogen for 1 minute, then cut in the thickness direction along each of MD and TD, and a digital microscope (manufactured by Keyence Corporation, product name "VHX-900") is used. Take a 200x magnified photograph, measure the bubble diameter of MD, ZD, and the bubble diameter of TD, ZD and the bubble diameter of TD, ZD for all the bubbles present on the cut surface of 2 mm in length in each of MD and TD. Repeated times.
  • the average value of the bubble diameters of all the bubbles MD and TD is taken as the average bubble diameter of the MD and TD, and the average value of the bubble diameters of all ZDs measured by the above operation is taken as the average bubble diameter of the ZD. It was.
  • ⁇ Closed cell ratio> The closed cell ratio of the foamed sheet is measured by the method described in the specification.
  • Impact absorption rate (%) (acceleration without foam sheet ⁇ acceleration when foam sheet is disposed) / (acceleration without foam sheet) ⁇ 100 Thickness
  • Example 1 100 parts by mass of linear low-density polyethylene (trade name “EXACT3027” manufactured by Exxon Chemical Co., Ltd.) obtained using a metallocene compound as a polyethylene resin, 2 parts by mass of azodicarbonamide as a foaming agent, , 6-di-t-butyl-p-cresol 0.3 parts by mass and 1 part by mass of zinc oxide are supplied to an extruder and melt-kneaded at 130 ° C., and then a resin sheet having a thickness of about 0.2 mm is obtained. Extruded.
  • linear low-density polyethylene trade name “EXACT3027” manufactured by Exxon Chemical Co., Ltd.
  • the resin sheet is cross-linked by irradiating an electron beam with an acceleration voltage of 800 kV on both surfaces by 5 Mrad, and then continuously fed into a foaming furnace maintained at 250 ° C. by hot air and an infrared heater to be heated and foamed. At the same time, it was stretched at a stretch ratio of MD of 1.3 times and a stretch ratio of TD of 2.0 times while foaming to obtain a foam sheet having a thickness of 0.06 mm. The resulting foamed sheet had a degree of crosslinking of 25% and a 25% compressive strength of 118 kPa.
  • This foam sheet is cut into 5 cm ⁇ 5 cm squares, and 25 square openings (vertical and horizontal 0.8 cm squares) are arranged in 5 rows and 5 rows using a punching die so that a pattern shown by 4-a in FIG. 4 is obtained.
  • the foam sheet of Example 1 was prepared by providing 25 openings, a minimum width of 1.7 mm (length between openings: 1.7 mm), and an opening area ratio: 64%.
  • the thickness, density, 25% compressive strength before processing and after processing, closed cell ratio, and average cell diameter (MD, TD, ZD) were measured by the above methods. The measured values are shown in Table 1.
  • the impact absorbability and pooling resistance were evaluated by the above methods. The results are shown in Table 1.
  • Example 2 to 6 For Examples 2 to 6, the mass part of the foaming agent, the MD stretching ratio, and the TD stretching ratio were adjusted so that the density, MD, TD, and ZD cell diameters shown in Table 1 were obtained, and The patterns are shown in FIG. 4 as 4-b (Example 2), 4-b (Example 3), 4-b (Example 4), 4-c (Example 5), and 4-d (Example 6), respectively. This was carried out in the same manner as in Example 1 except for the point. However, in Example 6, the irradiated electron beam was further changed to 7 Mrad. Note that 4-b in FIG.
  • 4 shows 16 rectangular openings of 0.8 cm in length and breadth in four rows and rows, minimum width: 3.6 mm (length between openings: 3.6 mm), and area ratio of openings: 4-c is a sheet of 41%, 4-c is a square opening of 0.8 cm in diameter, 16 in 4 rows and 4 rows, minimum width: 3.6 mm (length between openings: 3.6 mm), opening area Ratio: 32% sheet, 4-d is 25 square openings with a diameter of 0.9 cm in 5 rows and 5 rows, minimum width: 0.8 mm (length between openings: 0.8 mm), opening Partial area ratio: 64% sheet.
  • Comparative Examples 3 and 4 In Comparative Examples 3 and 4, the properties of SCF400 (manufactured by Nitto Denko Corporation) and Poron (manufactured by Roger Sinoac Co., Ltd.), which are commercially available foamed sheets, were measured and evaluated by the above methods.
  • Example 5 In Example 1, except that the opening was not provided, a foamed sheet was prepared in the same manner as in Example 1, and each property was measured and evaluated.
  • Example 6 a foamed sheet was prepared in the same manner as in Example 1 except that Poron (manufactured by Roger Sinoac Co., Ltd.), which is a commercial product, was used as the foamed sheet, and each property was measured and evaluated.
  • Poron manufactured by Roger Sinoac Co., Ltd.

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Abstract

Cette feuille de mousse à alvéoles fermées comporte : une ouverture; et des alvéoles qui ont un diamètre moyen dans le sens machine (MD) et dans le sens travers (TD) compris entre 25 et 330 µm. La feuille de mousse à alvéoles fermées comporte une section qui est à l'extérieur de l'ouverture, et dans laquelle la largeur minimale est de 1,5 à 60 fois le diamètre moyen des alvéoles. Ce dispositif d'affichage est pourvu de la feuille de mousse à alvéoles fermées précitée, et d'un panneau d'affichage. Selon la présente invention, il est possible de produire une feuille de mousse à alvéoles fermées qui présente non seulement une absorption de choc élevée, mais également une excellente résistance à l'agrégation, et un dispositif d'affichage pourvu de ladite feuille de mousse à alvéoles fermées.
PCT/JP2017/013109 2016-03-29 2017-03-29 Feuille de mousse à alvéoles fermées et dispositif d'affichage Ceased WO2017170794A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020195676A1 (fr) * 2019-03-26 2020-10-01 東レ株式会社 Feuille de résine à base de polyoléfine expansée
CN115188279A (zh) * 2022-07-29 2022-10-14 合肥维信诺科技有限公司 显示模组及显示装置

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JP2004043813A (ja) * 2002-07-09 2004-02-12 Jsp Corp ポリエチレン系樹脂押出発泡シート、該発泡シートの成形体、組立箱、コンクリート型枠用内張りシート及び発泡シートの製造方法
WO2013018582A1 (fr) * 2011-08-02 2013-02-07 日東電工株式会社 Mousse résinique et son procédé de production
JP2014015605A (ja) * 2012-06-11 2014-01-30 Nitto Denko Corp 樹脂発泡体及び発泡シール材
WO2014098125A1 (fr) * 2012-12-21 2014-06-26 日東電工株式会社 Corps en mousse de résine et composant en mousse

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Publication number Priority date Publication date Assignee Title
JP2004043813A (ja) * 2002-07-09 2004-02-12 Jsp Corp ポリエチレン系樹脂押出発泡シート、該発泡シートの成形体、組立箱、コンクリート型枠用内張りシート及び発泡シートの製造方法
WO2013018582A1 (fr) * 2011-08-02 2013-02-07 日東電工株式会社 Mousse résinique et son procédé de production
JP2014015605A (ja) * 2012-06-11 2014-01-30 Nitto Denko Corp 樹脂発泡体及び発泡シール材
WO2014098125A1 (fr) * 2012-12-21 2014-06-26 日東電工株式会社 Corps en mousse de résine et composant en mousse

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020195676A1 (fr) * 2019-03-26 2020-10-01 東レ株式会社 Feuille de résine à base de polyoléfine expansée
JPWO2020195676A1 (ja) * 2019-03-26 2021-12-16 東レ株式会社 ポリオレフィン系樹脂発泡シート
JP7029685B2 (ja) 2019-03-26 2022-03-04 東レ株式会社 ポリオレフィン系樹脂発泡シート
CN115188279A (zh) * 2022-07-29 2022-10-14 合肥维信诺科技有限公司 显示模组及显示装置

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