Silicone laminated metal support for foldable display and foldable display

Abstract

The present disclosure provides a silicone laminated metal support (20) for a foldable display (46). The silicone laminated metal support (20) includes a metal sheet (22) having a plurality of through holes (34), and a cured silicone product (24) adhered to at least one side of the metal sheet (22). The through-hole (34) is formed to bend the silicone laminated metal support (20) and is filled with the cured silicone product (24). The silicone laminated metal support (20) may provide good repeatable bendability and good tactile aesthetics (e.g., good tactile sensation) for a flexible display (46).

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and all advantages of U.S. Provisional Patent Application No. 63 / 442,431, filed January 31, 2023, the contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to a silicone-laminated metal support for a foldable display device and a foldable display. Background Art

[0004] Flexible displays generally include a flexible support, an organic light-emitting diode (OLED) element, and a passivation element capable of withstanding bending. Examples of flexible supports are plastic supports made of organic materials, supports having a structure in which organic materials and inorganic materials are laminated, and metal supports (such as thin stainless steel or aluminum). For example, Patent Document 1 discloses a flexible display in which the flexible support can be made of stainless steel (SUS), magnesium (Mg), rubber, graphene, Teflon (Teflon), PDMS (polydimethylsiloxane), urethane, or PVC (polyvinyl chloride) film. Patent Document 2 discloses a silicone support for a flexible display, in which the silicone support is formed of a cured silicone product.

[0005] Recently, flexible displays have been designed with structures that can withstand specific bending radii. Using current structures, easily recoverable folding and curling parts can be addressed and improved. However, pen strokes and pen and ball drop performance are difficult to improve. Current foldable display structures use a single silicone support to control the mechanical stress changes during bending or folding. The silicone support can help release mechanical stress in the bending area, but the single silicone support is too soft to protect against external impacts from pen strokes and finger touches.

[0006] Patent Document 3 discloses a foldable support for a foldable display, the foldable support comprising a metal layer, a first buffer layer, and a second buffer layer, wherein the first buffer layer and the second buffer layer are stacked on opposite sides of the metal layer in a thickness direction, and wherein the metal layer of the foldable support comprises a bending region and a non-bending region. Patent Document 4 discloses a metal support for a foldable display device, wherein the support member comprises a plurality of openings formed in a foldable region, and the openings comprise openings arranged in a first direction parallel to the first direction and openings disposed at positions offset in a second direction perpendicular to the first direction.

[0007] However, these flexible supports have poor bending capabilities and often fail to recover to their original state after repeated bending or long-term static bending.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: U.S. Patent Application Publication No. 2015 / 0021570A1

[0011] Patent Document 2: International Publication No. WO 2019 / 217672 A1

[0012] Patent Document 3: China Utility Model Authorization Publication No. 212411479U

[0013] Patent Document 4: U.S. Patent Application Publication No. 2020 / 0411777A1 Summary of the Invention

[0014] Technical issues

[0015] An object of the present invention is to provide a silicone-laminated metal support for a foldable display, wherein the silicone-laminated metal support can provide the foldable display with good reusability (e.g., improved durability and lower susceptibility to damage or failure during long-term, real-world use) and good tactile aesthetics (e.g., having a good or favorable tactile feel). Another object of the present invention is to provide a foldable display with good reusability and good tactile aesthetics.

[0016] Solution to the problem

[0017] The silicone-laminated metal support for a foldable display of the present invention is characterized by comprising: a metal sheet having a plurality of through-holes, and a cured silicone product adhered to at least one side of the metal sheet, wherein the through-holes are formed to bend the silicone-laminated metal support and are filled with the cured silicone product.

[0018] In various embodiments, the metal sheet includes copper (Cu), aluminum (Al), titanium (Ti), stainless steel (SUS), nickel-titanium (Ni-Ti), nickel-aluminum (Ni-Al), copper-zinc-nickel (Cu-Zn-Ni), copper-aluminum-nickel (Cu-Al-Ni), copper-aluminum-manganese (Cu-Al-Mn), titanium-nickel-copper-molybdenum (Ti-Ni-Cu-Mo), cobalt-nickel-gallium:iron (Co-Ni-Ga:Fe), silver-nickel (Ag-Ni), gold-cadmium (Au-Cd), iron-platinum (Fe-Pt), iron-nickel (Fe-Ni) or indium-cadmium (In-Cd), or is made thereof.

[0019] In various embodiments, the thickness of the metal sheet is in the range of 1 μm to 500 μm.

[0020] In various embodiments, the through holes are arranged in a first direction parallel to the metal sheet, and they are disposed at positions offset along a second direction perpendicular to the first direction.

[0021] In various embodiments, the through-holes have a shape that is rectangular, square, diamond, circular, oval, or a mixture thereof.

[0022] In various embodiments, the cured silicone product has a Shore A hardness of 70 to 95, measured according to ASTM D2240.

[0023] In various embodiments, the thickness of the cured silicone product is in the range of 10 μm to 300 μm.

[0024] In various embodiments, the cured silicone product is obtained by curing a hydrosilylation-curable silicone composition.

[0025] In various embodiments, the hydrosilylation-curable silicone composition comprises:

[0026] (A) an alkenyl group-containing organopolysiloxane, the alkenyl group-containing organopolysiloxane comprising the following components (A1) and (A2):

[0027] (A1) a linear organopolysiloxane having at least two alkenyl groups per molecule, and

[0028] (A2) a resin-type organopolysiloxane containing SiO 4 / 2 Unit, R 1 2R 2 SiO 1 / 2 Unit and R 1 3SiO 1 / 2 Unit, where each R 1 is an independently selected monovalent hydrocarbon group free of aliphatic unsaturated bonds, and each R 2 are independently alkenyl groups, provided that the content of alkenyl groups in component (A2) is from 0.5% to 5.0% by mass, and wherein R 1 2R 2 SiO 1 / 2 Unit and R 1 3SiO 1 / 2 The total number of moles of units is equal to 1 mole of SiO 4 / 2 The ratio of the unit is in the range of 0.70 to 1.10,

[0029] wherein the content of component (A2) is an amount of 45% to 65% by mass of the total mass of components (A1) and (A2);

[0030] (B) an organopolysiloxane having at least two silicon-bonded hydrogen atoms per molecule, the organopolysiloxane being present in an amount such that the silicon-bonded hydrogen atoms in component (B) are present in an amount of 0.1 to 5 moles per mole of alkenyl groups in component (A); and

[0031] (C) A catalytic amount of a hydrosilylation reaction catalyst.

[0032] The foldable display of the present invention comprises:

[0033] Foldable display device, and

[0034] The silicone-laminated metal support mentioned above.

[0035] In various embodiments, the foldable display is an organic light emitting diode (OLED) display.

[0036] Effects of the Invention

[0037] The silicone-laminated metal support of the present invention can provide the flexible display with good reproducible bendability and good tactile aesthetics (eg, good touch). The flexible display of the present invention also has good reproducible bendability and good tactile aesthetics. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a perspective view showing one example of the silicone-laminated metal support of the present invention.

[0039] Figure 2 is a perspective view having a partially broken surface and showing another example of the silicone-laminated metal support of the present invention.

[0040] Figure 3 is a schematic diagram showing one example of a method for producing the silicone-laminated metal support of the present invention.

[0041] Figure 4 is a perspective view showing one example of a metal sheet used for producing the silicone-laminated metal support of the present invention.

[0042] Figure 5 is a cross-sectional view of one example of the silicone-laminated metal support of the present invention.

[0043] Figure 6 is a schematic diagram illustrating another example of the method for producing the silicone-laminated metal support of the present invention.

[0044] Figure 7is a cross-sectional view of another example of the silicone-laminated metal support of the present invention.

[0045] Figure 8 is a cross-sectional view of an example of a foldable display of the present invention.

[0046] Figure 9 is a cross-sectional view of another example of a foldable display of the present invention.

[0047] Figure 10 This is a top view of a metal sheet used in the examples.

[0048] Figure 11 is a schematic diagram illustrating a method for measuring a push force test using a texture analyzer of a replica structure for a foldable display in an embodiment.

[0049] Figure 12 is a schematic diagram illustrating a method of measuring the recovery properties of the silicone-laminated metal support in Examples.

[0050] Figure 13 is a schematic diagram illustrating a method of measuring static / dynamic folding properties of a silicone-laminated metal support in Examples.

[0051] Figure 14 is a cross-sectional view of a foldable display in an embodiment.

[0052] definition

[0053] The terms used herein are for the purpose of describing specific embodiments only and are not intended to be limiting. As used herein, the singular forms "a / an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, when used in this specification, the terms "comprises / comprising" and / or "includes / including" specify the presence of stated features, integers, steps, operations, elements, parts and / or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups thereof.

[0054] The use of "for example," "for example," "such as," and "including" to list illustrative examples is not meant to be limited to the listed examples. Thus, "for example" or "such as" means "for example, but not limited to" or "such as, but not limited to" and encompasses other similar or equivalent examples. As used herein, the term "about" is used to reasonably encompass or describe minor variations of a numerical value as measured by instrumental analysis or as a result of sample processing. Such minor variations can be approximately ±0-25%, ±0-10%, ±0-5%, or ±0-2.5% of a numerical value. In addition, the term "about" applies to both numerical values when associated with a range of values. In addition, the term "about" applies to numerical values even when not explicitly stated.

[0055] It should be understood that the appended claims are not limited to the specific and particular compounds, compositions or methods described in the detailed description, which may vary between specific embodiments falling within the scope of the appended claims. To the extent that any Markush group is relied upon herein to describe specific features or aspects of various embodiments, it should be understood that different, special and / or unexpected results can be obtained from each member of the corresponding Markush group independent of all other Markush members. Each member of the Markush group can be relied upon individually and / or in combination and provides adequate support for specific embodiments within the scope of the appended claims.

[0056] It should also be understood that any ranges and subranges relied upon in describing various embodiments of the present invention are independently and collectively within the scope of the appended claims, and should be understood to describe and contemplate all ranges including integer values and / or fractional values therein, even if such values are not explicitly stated herein. Those skilled in the art will readily recognize that the enumerated ranges and subranges fully describe and enable various embodiments of the present invention, and that such ranges and subranges can be further delineated as being related to one-half, one-third, one-quarter, one-fifth, etc. As just one example, a range of "0.1 to 0.9" can be further delineated as being the lower third (i.e., 0.1 to 0.3), the middle third (i.e., 0.4 to 0.6), and the upper third (i.e., 0.7 to 0.9), which are individually and collectively within the scope of the appended claims and can be relied upon individually and / or collectively and provide sufficient support for specific embodiments within the scope of the appended claims. In addition, with respect to language such as "at least," "greater than," "less than," and "not more than," which limits or modifies a range, it should be understood that such language includes subranges and / or upper or lower limits. As another example, a range of "at least 10" inherently includes the sub-range of at least 10 to 35, the sub-range of at least 10 to 25, the sub-range of 25 to 35, etc., and each sub-range can be relied upon individually and / or collectively and provide sufficient support for specific embodiments within the scope of the appended claims. Finally, individual numbers within a disclosed range can be relied upon and provide sufficient support for specific embodiments within the scope of the appended claims. For example, a range of "1 to 9" includes individual integers such as 3, as well as individual numbers including decimal points (or fractions), such as 4.1, which can be relied upon and provide sufficient support for specific embodiments within the scope of the appended claims. DETAILED DESCRIPTION

[0057] First, the silicone laminated metal support 20 for a flexible display 46 of the present invention will be described in detail with reference to the accompanying drawings. The flexible display 46 may also be referred to herein as a foldable display 46 or a foldable display device 46. Generally, like numbers refer to like parts throughout the several views.

[0058] Figure 1 An example of a silicone-laminated metal support 20 of the present invention is shown. Figure 1As shown, the silicone laminated metal support 20 includes a metal sheet 22 and a cured silicone product 24, wherein the metal sheet 22 has a plurality of through-holes 34, and the cured silicone product 24 is adhered to one side of the metal sheet 22. The through-holes 34 are filled with the cured silicone product 24. It should be understood that the amount of cured silicone product 24 in the through-holes 34 can be uniform or varied. For example, the through-holes 34 can all be completely filled, all partially filled, or a combination of partially filled and completely filled. Similarly, if the through-holes 34 are partially filled, they can be uniformly filled to the same level or amount, or can vary in level or amount, such as if there is a gradient of different fillings in one or more locations of the metal sheet 22. Typically, the through-holes 34 are completely or nearly completely filled, and more typically, the through-holes 34 are completely filled.

[0059] Figure 2 Another example of a silicone laminated metal support 20 of the present invention is shown. Figure 2 As shown, the silicone laminated metal support 20 includes a metal sheet 22 and a cured silicone product 24, wherein the metal sheet 22 has a plurality of through holes 34, and the cured silicone product 24 is adhered to both sides of the metal sheet 22. The through holes 34 are filled with the cured silicone product 24.

[0060] The metal sheet 22 is not limited as long as the flexibility of the silicone laminated metal support 20 of the present invention is not significantly reduced, but is typically made of copper (Cu), aluminum (Al), titanium (Ti), stainless steel (SUS), nickel-titanium (Ni-Ti), nickel-aluminum (Ni-Al), copper-zinc-nickel (Cu-Zn-Ni), copper-aluminum-nickel (Cu-Al-Ni), copper-aluminum-manganese (Cu-Al-Mn), titanium-nickel-copper-molybdenum (Ti-Ni-Cu-Mo), cobalt-nickel-gallium:iron (Co-Ni-Ga:Fe), silver-nickel (Ag-Ni), gold-cadmium (Au-Cd), iron-platinum (Fe-Pt), iron-nickel (Fe-Ni), indium-cadmium (In-Cd), or alloys thereof. Among them, the metal sheet 22 is typically made of stainless steel (SUS). The thickness of the metal sheet 22 is not limited, but is typically in the range of 1 μm to 500 μm, optionally in the range of 5 μm to 300 μm, optionally in the range of 50 μm to 300 μm, optionally in the range of 50 μm to 250 μm, or optionally in the range of 50 μm to 150 μm. This is because if the thickness is equal to or higher than the lower limit of the above range, the silicone-laminated metal support 20 will have appropriate mechanical strength, while if the thickness is equal to or lower than the upper limit of the above range, the silicone-laminated metal support 20 will have good flexibility. The (average) thickness of the metal sheet 22 may be uniform or may vary.

[0061] The through hole 34 is formed to bend the silicone-laminated metal support 20. That is, the through hole 34 serves as the foldable region 48 of the silicone-laminated metal support 20 of the present invention. The through hole 34 generally reduces the difference in tactile aesthetics, specifically, reduces the difference in tactile feeling on the foldable region 48 and the tactile feeling on the non-foldable region of the foldable display 46. Figure 1 or Figure 2 In the embodiment of the present invention, the through holes 34 are typically arranged in a first direction parallel to the metal sheet 22, and are typically located at positions offset along a second direction perpendicular to the first direction. In addition, the through holes 34 typically have a rectangular, square, diamond, circular, elliptical, or a combination thereof. For example, the through holes 34 can be a combination of a rectangular and a square, a circular and a square, or a combination of a diamond, a circular, and an elliptical. The number of through hole columns is not limited as long as the flexibility of the silicone laminated metal support 20 of the present invention is not significantly reduced, but is typically in the range of 5 to 200, and optionally in the range of 5 to 100.

[0062] The size of the through hole 34 is not limited, but the width is typically in the range of 1 μm to 500 μm, optionally in the range of 5 μm to 300 μm, optionally in the range of 50 μm to 300 μm, optionally in the range of 50 μm to 250 μm, or optionally in the range of 50 μm to 150 μm. As for the through hole 34, the length is not limited, but it is typically in the range of 100 μm to 2000 μm, optionally in the range of 500 μm to 2000 μm, or optionally in the range of 1000 μm to 2000 μm. This is because if the size is equal to or higher than the lower limit of the above range, the silicone laminated metal support 20 will have good flexibility, and if the size is equal to or lower than the upper limit of the above range, the silicone laminated metal support 20 will have appropriate mechanical strength. As described above, the through holes 34 can have the same shape, or can have two or more different shapes. Likewise, the size of the through-holes 34 may be uniform or may vary. For example, the through-holes 34 may be rectangular with substantially the same size and shape, or may be circular with varying diameters and / or depths.

[0063] The cured silicone product 24 typically has a hardness in the range of 70 to 95, optionally in the range of 75 to 95, or optionally in the range of 75 to 90, as measured using the Shore A hardness specified in ASTM D2240. The reason for this is as follows: when the hardness of the cured silicone product is less than the lower limit of the range, its strength may be insufficient; on the other hand, when the upper limit of the range is exceeded, the flexibility of the silicone-laminated metal support 20 in question tends to be insufficient.

[0064] To exhibit satisfactory flexibility, the cured silicone product 24 is typically formed from a cured silicone product having a tensile strength of at least 10 MPa and an elongation of at least 30%, as specified and measured according to ASTM D412. The tensile strength is typically at least 15 MPa. In these or other embodiments, the elongation is typically at least 50%. This is because the flexibility of the silicone-laminated metal support 20 becomes unsatisfactory at values below the indicated range.

[0065] The thickness of the cured silicone product 24 is not limited, but is typically in the range of 10 μm to 300 μm, optionally in the range of 10 μm to 250 μm, optionally in the range of 50 μm to 250 μm, or optionally in the range of 50 μm to 175 μm. This is because if the thickness is equal to or higher than the lower limit of the above range, the silicone-laminated metal support 20 will have appropriate mechanical strength, and if the thickness is equal to or lower than the upper limit of the above range, the silicone-laminated metal support 20 will have good flexibility.

[0066] Considering economic benefits, the cured silicone product 24 can be obtained by curing a hydrosilylation-curable silicone composition, especially a hydrosilylation-curable silicone composition comprising:

[0067] (A) an alkenyl group-containing organopolysiloxane comprising, optionally consisting essentially of, or optionally consisting of the following components (A1) and (A2):

[0068] (A1) a linear organopolysiloxane having at least two alkenyl groups per molecule, and

[0069] (A2) a resin-type organopolysiloxane containing SiO 4 / 2 Unit, R 1 2R 2 SiO 1 / 2 Unit and R 1 3SiO 1 / 2 Units, optionally consisting essentially of, or optionally consisting of, wherein R 1 are the same or different monovalent hydrocarbon groups not containing aliphatic unsaturated bonds, and R 2 is an alkenyl group, provided that the content of the alkenyl group is 0.5% by mass to 5.0% by mass, and wherein R 1 2R 2 SiO 1 / 2 Unit and R 1 3SiO 1 / 2 The total number of moles of units is equal to 1 mole of SiO 4 / 2

[0070] The ratio of the unit is in the range of 0.70 to 1.10,

[0071] wherein the content of component (A2) is an amount of 45% to 65% by mass of the total mass of components (A1) and (A2);

[0072] (B) an organopolysiloxane having at least two silicon-bonded hydrogen atoms per molecule, the organopolysiloxane being present in an amount such that the silicon-bonded hydrogen atoms in this component are from 0.1 mol to 5 mol per 1 mol of alkenyl groups in component (A); and

[0073] (C) A catalytic amount of a hydrosilylation reaction catalyst.

[0074] Component (A) is an alkenyl-containing organopolysiloxane and serves as the base component of the composition. In various embodiments, component (A) consists essentially of the following components (A1) and (A2).

[0075] Component (A1) is a linear organopolysiloxane having at least two alkenyl groups per molecule. Examples of the alkenyl groups in component (A1) are alkenyl groups having 2 to 12 carbon atoms, such as vinyl groups, allyl groups, butenyl groups, pentenyl groups, hexenyl groups, heptenyl groups, octenyl groups, nonenyl groups, decenyl groups, undecenyl groups, and dodecenyl groups. Vinyl groups and allyl groups are typical. Examples of silicon atom-bonded groups other than alkenyl groups in component (A1) are alkyl groups having 1 to 12 carbon atoms, such as methyl groups, ethyl groups, propyl groups, butyl groups, pentyl groups, hexyl groups, heptyl groups, octyl groups, nonyl groups, decyl groups, undecyl groups, and dodecyl groups; aryl groups having 6 to 12 carbon atoms, such as phenyl groups, tolyl groups, xylyl groups, and naphthyl groups; aralkyl groups having 7 to 12 carbon atoms, such as benzyl groups, phenethyl groups, and naphthylethyl groups; and halogen-substituted alkyl groups having 1 to 12 carbon atoms, such as 3-chloropropyl groups and 3,3,3-trifluoropropyl groups. Methyl groups and phenyl groups are typical.

[0076] Component (A1) has a substantially linear molecular structure, but a portion of the molecular chain may be branched or slightly branched. The viscosity of component (A1) at 25°C is not limited, but is typically in the range of 1,000 mPa·s to 50,000 mPa·s, optionally in the range of 1,500 mPa·s to 45,000 mPa·s, or optionally in the range of 2,000 mPa·s to 45,000 mPa·s. The reason for the above is as follows: when the viscosity of component (A1) at 25°C is less than the above lower limit, the cured silicone product 24 provided by the cured composition tends to have unsatisfactory flexibility; on the other hand, when the viscosity of component (A1) at 25°C exceeds the above upper limit, the transparency of the cured silicone product 24 provided by the cured composition tends to decrease at high temperatures, and the composition assumes that the viscosity is too high and the handling characteristics tend to decrease.

[0077] Examples of the organopolysiloxane used for component (A1) are dimethylpolysiloxane having both molecular chain ends blocked with dimethylvinylsiloxy groups, copolymers of dimethylsiloxane and methylvinylsiloxane having both molecular chain ends blocked with dimethylvinylsiloxy groups, methylvinylpolysiloxane having both molecular chain ends blocked with trimethylsiloxy groups, copolymers of dimethylsiloxane and methylvinylsiloxane having both molecular chain ends blocked with trimethylsiloxy groups, and mixtures of two or more thereof.

[0078] Component (A2) is a resin-type organopolysiloxane containing SiO 4 / 2 Unit, R 1 2R 2 SiO 1 / 2 Unit and R 1 3SiO 1 / 2 The unit optionally consists essentially of, or optionally consists of, and serves to impart satisfactory hardness and flexibility to the cured silicone product 24 provided by curing the composition.

[0079] In the formula, R 1 are the same or different monovalent hydrocarbon groups that do not contain aliphatic unsaturated bonds. 1Examples of hydrocarbon groups are alkyl groups having 1 to 12 carbon atoms, such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, and dodecyl groups; aryl groups having 6 to 12 carbon atoms, such as phenyl, tolyl, xylyl, and naphthyl groups; aralkyl groups having 7 to 12 carbon atoms, such as benzyl, phenethyl, and naphthylethyl groups; and halogen-substituted alkyl groups having 1 to 12 carbon atoms, such as 3-chloropropyl and 3,3,3-trifluoropropyl groups. Methyl and phenyl groups are typical.

[0080] In the formula, each R 2 is independently an alkenyl group. 2 Examples of alkenyl groups are alkenyl groups having 2 to 12 carbon atoms, such as vinyl groups, allyl groups, butenyl groups, pentenyl groups, hexenyl groups, heptenyl groups, octenyl groups, nonenyl groups, decenyl groups, undecenyl groups, and dodecenyl groups. Vinyl groups and allyl groups are typical.

[0081] Component (A2) has an alkenyl group content of 0.5 to 5.0% by mass, optionally 1.0 to 5.0% by mass, optionally 2.0 to 5.0% by mass, optionally 3.0 to 5.0% by mass, or optionally 3.0 to 4.5% by mass. This is because when the alkenyl group content is less than the lower limit, the hardness of the cured silicone product 24 provided by curing the composition tends to decrease; on the other hand, when the alkenyl group content exceeds the upper limit, the flexibility of the cured silicone product 24 provided by curing the composition tends to decrease.

[0082] R in component (A2) 1 2R 2 SiO 1 / 2 and R 1 3SiO 1 / 2 The total number of moles of units is equal to 1 mole of SiO 4 / 2 The ratio of the units is in the range of 0.70 to 1.10, or optionally in the range of 0.80 to 1.10. The reason for this is as follows: when the ratio is less than the lower limit, component (A2) exhibits an excessively large molecular weight, and the transparency of the cured silicone product 24 provided by the cured composition may be reduced; on the other hand, when the ratio exceeds the upper limit, the cured silicone product 24 provided by the cured composition may have unsatisfactory strength.

[0083] The content of component (A2) is in the range of 20% to 50% by mass, preferably in the range of 20% to 45% by mass, or preferably in the range of 25% to 40% by mass, based on the total mass of components (A1) and (A2). This is because, when the content is less than the lower limit of the range, the hardness of the cured silicone product 24 provided by curing the composition tends to decrease; on the other hand, when the content exceeds the upper limit of the range, the flexibility of the cured silicone product 24 provided by curing the composition tends to decrease.

[0084] Component (B) is an organopolysiloxane containing silicon-bonded hydrogen atoms and is used as a crosslinking agent for the composition of the present invention. The silicon-bonded hydrogen atoms may be bonded, for example, at terminal positions on the molecular chain and / or at side chain positions on the molecular chain. Examples of silicon-bonded groups other than hydrogen atoms in component (B) include R 1 The monovalent hydrocarbon group containing no aliphatic unsaturated bond is typically a methyl group or a phenyl group.

[0085] In certain embodiments, component (B) is a resinous organopolysiloxane comprising SiO 4 / 2 Unit and R 1 2HSiO 1 / 2 Units, optionally consisting essentially of, or optionally consisting of, wherein R 1 As above, and where R 1 2HSiO 1 / 2 The total number of moles of units is equal to 1 mole of SiO 4 / 2 The ratio of the cells is in the range of 0.70 to 1.80.

[0086] In the formula, R 1 is a monovalent hydrocarbon group that is the same or different from the above and does not contain aliphatic unsaturation. Methyl and phenyl groups are typical.

[0087] In the formula, R 1 2HSiO 1 / 2 The total number of moles of units is equal to 1 mole of SiO 4 / 2 The ratio of the units is in the range of 0.70 to 1.80, optionally in the range of 0.80 to 1.70, optionally in the range of 0.90 to 1.70, or optionally in the range of 1.00 to 1.70. The reason for this is as follows: when the ratio is less than the lower limit, component (B) exhibits an excessively large molecular weight, and the transparency of the cured silicone product 24 provided by the cured composition may be reduced; on the other hand, when the ratio exceeds the upper limit, the cured silicone product 24 provided by the cured composition may have unsatisfactory strength.

[0088] The content of component (B) in the composition of the present invention is an amount that provides 0.1 mol to 5 mol, optionally 0.5 mol to 3 mol, or optionally 0.5 mol to 2 mol of silicon-bonded hydrogen atoms in the component per 1 mol of alkenyl groups in component (A). The reason for this is as follows: when the content is less than the lower limit of the range, curing of the composition tends to be unsatisfactory; on the other hand, when the upper limit of the range is exceeded, the flexibility and / or transparency of the cured silicone product 24 provided by curing the composition may be reduced.

[0089] Component (C) is a hydrosilylation reaction catalyst, and promotes the solidification of composition.Be exemplified by the hydrosilylation reaction catalyst of component (C) as platinum catalyst, rhodium catalyst and palladium catalyst.Platinum catalyst is typical especially.The exemplification of these platinum catalysts is platinum superfine powder, platinum black, the platinum on the silicon dioxide superfine powder, the platinum on the activated carbon, chloroplatinic acid, the alcoholic solution of chloroplatinic acid and platinum compound, such as platinum olefin complex, platinum alkenylsiloxane complex etc.

[0090] The content of component (C) in the composition is a catalytic amount, specifically an amount providing 0.01 to 1,000 ppm by mass of catalyst metal atoms relative to the composition of the present invention. This is because, if the content is less than the lower limit of the range, there is a risk that the resulting composition will not be sufficiently cured. On the other hand, if the content exceeds the upper limit of the range, curing will not be significantly promoted, and there is a risk that problems such as discoloration of the cured silicone product 24 will occur.

[0091] The composition may further comprise (D) a hydrosilylation reaction inhibitor to adjust the curing rate of the composition of the present invention. Examples of hydrosilylation reaction inhibitors for component (D) are alkynols such as 2-methyl-3-butyn-2-ol, 3,5-dimethyl-1-hexyn-3-ol, 1-ethynylcyclohexan-1-ol, and 2-phenyl-3-butyn-2-ol; alkene-yne compounds such as 3-methyl-3-pentene-1-yne and 3,5-dimethyl-3-hexene-1-yne; and 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane and 1,3,5,7-tetramethyl-1,3,5,7-tetrahexenylcyclotetrasiloxane, benzotriazole, and the like.

[0092] The content of component (D) in the composition is not limited and can be appropriately selected according to the molding method and curing conditions; however, an amount within a range of 0.001 to 5 parts by mass per 100 parts by mass of component (A) is generally used.

[0093] To the extent that the purpose of the present invention is not impaired, the composition may incorporate, for example, adhesion promoters, flame retardants, inorganic fillers, pigments, etc. However, generally speaking, adhesion promoters, flame retardants, and inorganic fillers are typically not incorporated from the perspective of transparency of the cured silicone product 24 provided by curing the composition.

[0094] The method of producing the silicone laminated metal support 20 is not limited, but it is typically shown in Figure 3 middle, Figure 3 is a schematic diagram illustrating a method of producing a silicone-laminated metal support 20 according to an exemplary embodiment.

[0095] First, a flat metal sheet is prepared by chemical etching, stamping or laser cutting Figure 4 The metal sheet 22 shown. Figure 4 , the metal sheet 22 is supported by a substrate 32 to fix a plurality of through holes 34 .

[0096] The metal sheet 22 is set on a jig 26 and is coated with the curable silicone composition 28 by a scraper 30. Then, the curable silicone composition 28 on the metal sheet 22 is cured by heating. Figure 5 A silicone laminated metal support 20 is shown with a cured silicone product 24 adhered to one side of a metal sheet 22 .

[0097] Figure 6 is a schematic diagram illustrating another method of producing a silicone-laminated metal support 20 according to an exemplary embodiment. Figure 6 , a metal sheet 22 coated with a cured silicone product 24 on one side is set on a jig 26, and a curable silicone composition 28 is coated on the other side of the metal sheet 22 by a scraper 30. The curable silicone composition 28 on the metal sheet 22 is cured by heating. Figure 7 A silicone laminated metal support 20 is shown with a cured silicone product 24 adhered to both sides of a metal sheet 22 .

[0098] Next, the foldable display 46 of the present invention is explained in detail by using the accompanying drawings.

[0099] Figure 8 or Figure 9 An example of a foldable display 46 of the present invention is shown. Figure 8 or Figure 9 As shown, the foldable display 46 includes: a silicone-laminated metal support 20, wherein the silicone-laminated metal support 20 includes: a metal sheet 22 and a cured silicone product 24; an optically transparent adhesive 36; a flexible device 40; an optically transparent adhesive 37; a polarizing film 42; an optically transparent adhesive 38; and a cover window 44. Figure 8 or Figure 9 As shown, a foldable display device 46 is characterized by a foldable region 48. The flexible device 40 may also be referred to herein as a flexible display device 40.

[0100] exist Figure 8 or Figure 9 In the embodiment of the present invention, the optically clear adhesive 36 is used to adhere the silicone-laminated metal support 20 to the flexible device 40. However, when the silicone-laminated metal support 20 is directly adhered to the flexible device 40, the optically clear adhesive 36 may be optional. The optically clear adhesive 36 may be, for example, a silicone adhesive or an acrylic adhesive. The optically clear adhesive 36 is not limited as long as the flexibility of the flexible display 46 is not significantly reduced. Typically, the thickness of the optically clear adhesive 36 is 10 μm or less.

[0101] like Figure 8 or Figure 9 As shown, flexible device 40 is adhered to polarizing film 42 using optically clear adhesive 37, and polarizing film 42 is adhered to cover window 44 using another optically clear adhesive 38. Polarizing film 42 may be provided on flexible device 40 to prevent reflection of external light. Optically clear adhesives 37 and 38 may be, for example, silicone or acrylic. Optically clear adhesives 37 and 38 are not limited as long as they do not significantly reduce the flexibility of flexible display 46. Typically, adhesives 37 and 38 have a thickness of 100 μm or less.

[0102] The cover window 44 is typically made of a flexible material, such as a plastic material. The cover window 44 may be made of one or more selected from the group consisting of polyethylene terephthalate (PET), polyester, polyethylene naphthalate (PEN), polyetheretherketone (PEEK), polycarbonate (PC), polyethersulfone (PES), polyimide (PI), polyarylate (PAR), polycyclic olefin (PCO), and polynorbornene.

[0103] Examples of the foldable display 46 include a cholesteric liquid crystal (LC) display, a polymer dispersed liquid crystal (PDLC) display, an electrophoretic (EP) display, and an organic light emitting diode (OLED) display.

[0104] Example

[0105] The silicone laminated metal support for a foldable display and the foldable display of the present invention will now be described in detail using examples. In the examples, the viscosity is a value at 25°C. In the following chemical formula, "Me" represents a methyl group, and "Vi" represents a vinyl group.

[0106] The following components were used as component (A).

[0107] Component (a-1): dimethylpolysiloxane having both molecular chain terminals blocked with dimethylvinylsiloxy groups, the dimethylpolysiloxane having a viscosity of 45,000 mPa·s and a vinyl group content of 0.09% by mass.

[0108] Component (a-2): dimethylpolysiloxane having both molecular chain terminals blocked with dimethylvinylsiloxy groups, the dimethylpolysiloxane having a viscosity of 10,000 mPa·s and a vinyl group content of 0.14% by mass.

[0109] Component (a-3): dimethylpolysiloxane having both molecular chain terminals blocked with dimethylvinylsiloxy groups, the dimethylpolysiloxane having a viscosity of 350 mPa·s and a vinyl group content of 0.47% by mass.

[0110] Component (a-4): a resinous organopolysiloxane having a vinyl group content of 4.20% by mass and represented by the following average unit formula:

[0111] (Me3SiO 1 / 2 ) 0.34 (Me2ViSiO 1 / 2 ) 0.11 (SiO 4 / 2 ) 0.55

[0112] The following components were used as component (B).

[0113] Component (b-1): an organopolysiloxane having a silicon atom-bonded hydrogen atom content of 0.96% by mass and represented by the following average unit formula:

[0114] (Me2HSiO 1 / 2 ) 1.58 (SiO 4 / 2 ) 1.00

[0115] The following components were used as component (C).

[0116] Component (c-1): dimethylpolysiloxane having dimethylvinylsiloxy groups capped at both molecular chain ends, the dimethylpolysiloxane having a viscosity of 350 mPa·s and a vinyl group content of 0.47% by mass, the dimethylpolysiloxane being a solution of a 1,3-divinyltetramethyldisiloxane platinum complex (the platinum metal content in this component, calculated as a mass unit, being approximately 1.7% by mass).

[0117] The following components were used as component (D).

[0118] Component (d-1): 3,5-dimethyl-1-hexyn-3-ol

[0119] The following components were used as adhesion promoters.

[0120] Component (e-1): an organopolysiloxane represented by the following average unit formula:

[0121] [(CH2=CH)(CH3)SiO 2 / 2 ] 0.23 [CH2(O)CHCH2OC3H6SiO 3 / 2 ] 0.31 [(CH3)2SiO 2 / 2 ] 0.46 (CH3O 1 / 2 ) 0.2

[0122] The following components were used as pigments.

[0123] Component (f-1): Carbon black powder. This carbon black powder was added as a masterbatch composed of 50% by mass of the carbon black powder and 50% by mass of dimethylpolysiloxane having both molecular chain ends capped with dimethylvinylsiloxy groups, the dimethylpolysiloxane having a viscosity of 2,000 mPa·s and a vinyl group content of 0.23% by mass.

[0124] <Reference Examples 1 to 3>

[0125] The components further shown in Table 1 below were mixed in the quantitative proportions shown in Table 1 until uniform to produce a hydrosilylation curable silicone composition. The resulting composition was heated at 150°C for 5 minutes to produce a 1 mm thick cured silicone product, which was submitted for tensile strength and elongation measurements. The composition was also heated at 150°C for 10 minutes to produce a 6 mm thick sheet of the cured silicone product, which was submitted for hardness measurements. The results are given in Table 1. "SiH / Vi" in Table 1 represents the ratio of the number of moles of silicon-bonded hydrogen atoms in component (B) per 1 mole of vinyl groups in component (A). The properties (hardness, tensile strength and elongation) of the cured silicone product were tested, measured or evaluated using the following methods.

[0126] <Hardness>

[0127] A 6 mm thick cured product was prepared by curing the hydrosilylation-curable silicone composition by heating at 150° C. for 10 minutes. The Shore A hardness of the cured silicone product was measured using a Type A durometer specified in ASTM D2240.

[0128] <Curability>

[0129] Use mobile die rheometer (MDR) to determine the curability of test material. MDR measures the torque required for the lower die to oscillate through a small arc, and the displacement torque S' increases as the test material solidifies, and is automatically plotted and / or calculated as pound-inch (Newton-meter) relative to time via preset computerized conditions. The curve is a function of the test temperature and the characteristics (i.e., plasticity, scorch time, durometer, cure rate, and modulus) of the cured and uncured test material. The instrument can also measure non-displacement torque S" (loss modulus) and calculate loss tangent (S" / S' ratio). The test process steps are:

[0130] 1. Set the test temperature, time sweep and arc.

[0131] 2. Prepare or formulate test materials as specified.

[0132] 3. Weigh out enough material to provide a volume of 5.0 mL + / - 0.5 mL based on the specific gravity of the material.

[0133] 4. Place the sample between two 4 inch x 5 inch (10 cm x 13 cm) pieces of release film to form a sandwich.

[0134] 5. Open the rheometer platen, place the material in the center of the lower die, and close the platen. The test will automatically begin when the die closes. The data will be printed out at the end of the test.

[0135] 6. Remove the sample, open the platen, remove the cured material and close the platen.

[0136] The test results show:

[0137] -Displacement torque S', (minimum or maximum value)

[0138] - Non-displacement torque S", (minimum or maximum value)

[0139] -ts1 (time to increase one torque unit from the minimum value S')

[0140] -t10 (time required to achieve 10% maximum cure)

[0141] -t50 (time required to achieve 50% of maximum cure)

[0142] -t90 (time required to achieve 90% of maximum cure)

[0143] Unless otherwise stated, torque units are assumed to be lb-in.

[0144] Unless otherwise specified, "time" will be assumed to be seconds.

[0145] The reference test standard is ASTM D 5289-92.

[0146] <Overlap Cut>

[0147] The adhesion of the test material is determined by measuring the amount of pull required to separate the lap shear laminate. The test procedure steps are:

[0148] 1. A SUS substrate (size: 2.5 cm×7.6 cm×0.2 cm T) was prepared.

[0149] 2. Clean the SUS substrates with isopropyl alcohol or acetone, and allow them to air dry.

[0150] 3. Appropriate spacers were prepared to obtain a sample line thickness (T) of 0.50 mm, and placed on the upper surface of the SUS substrate.

[0151] 4. Dispense 1.5 g of the test material on the placement pad with the SUS substrate.

[0152] 5. A second SUS substrate was placed directly on top of the material dispensed SUS substrate, with the test / adhesion area being 25 mm x 10 mm x 0.5 mm T (as defined by the SUS substrate and spacer).

[0153] 6. Overlap the SUS substrate so that it extends 2.5 mm beyond the adhesion area.

[0154] 7. Clamp the SUS substrate of the sandwich.

[0155] 8. Remove excess material from the sides of the sandwiched SUS substrate.

[0156] 9. Place the laminate with the test material in an oven at a specific temperature to cure the test material.

[0157] 10. Place one laminate in a tensile type tester, such as an Instron materials testing machine or a Universal Testing Machine (UTM), and pull the laminate apart at a rate of 50 mm / min.

[0158] 11. Repeat the pull for two more laminates and calculate the pull required to shear the laminate and report the average of the three values in pounds per square inch.

[0159] The results are reported in pounds per square inch (psi). The amount of adhesive or cohesive failure is assessed. The reference standards are ASTM D-816, ASTM D-1002, MIL-S-8802, and ASTM C-961.

[0160] [Table 1]

[0161]

[0162] <Examples IE1 to IE4>

[0163] use Figure 10 The etched SUS sheet having a thickness of 150 μm or 250 μm shown is used to produce a silicone-laminated metal support, which includes a SUS sheet and a cured silicone product obtained by curing the curable silicone composition prepared by Reference Example 1, wherein the cured silicone product having a certain thickness is adhered to one side of the SUS sheet having a certain thickness and filled in the through hole. Figure 10 The dimensions of the etched SUS sheets shown are as follows.

[0164] L0 = 1400 μm; L1 = 200 μm; W0 = 100 μm; and W1 = 200 μm.

[0165] Number of rows of through holes = 50

[0166] The silicone laminated metal supports were evaluated by the push test, static folding test and dynamic folding test mentioned below. The results of the tests are further shown in Table 2 below.

[0167] <Comparative Examples CE1 to CE6>

[0168] A non-etched and flat SUS sheet with a thickness of 50 μm, 150 μm, or 250 μm was used to produce a silicone-laminated metal support comprising a SUS sheet and a cured silicone product obtained by curing the curable silicone composition prepared in Reference Example 1, wherein the cured silicone product having a certain thickness was adhered to one side of the SUS sheet having a certain thickness. The silicone-laminated metal support was evaluated by a push test, a static folding test, and a dynamic folding test as mentioned below. The results of the test are also shown in Table 2.

[0169] <Push Test>

[0170] like Figure 11 As shown, the push force test measures the depth of the spherical probe by pushing it with a force (0.36N). The test results are related to the stress release performance from external impact. Specifically, the push force test method using a texture analyzer is designed to measure or compare the stress release performance of samples from internal impact.

[0171] <Static folding test>

[0172] like Figure 12As shown in Figure 1, the static folding test measures recovery performance after bending at 105°C for 1,000 hours. Static folding test performance is measured by the height of the warp after the sample structure is flattened. Samples with low static folding performance exhibit permanent warping. Samples with high static folding performance will remain flat after the bending force is released.

[0173] <Dynamic folding test>

[0174] like Figure 13 As shown, the dynamic folding test measures recovery performance after dynamic bending at 23°C ± 2°C. Dynamic folding test performance is measured by the height of the warpage after the sample structure is flattened. Samples with low dynamic folding performance will show permanent warping and pattern bridging fractures. Samples with high dynamic folding performance will be flat immediately after the bending force is released and will not show pattern bridging fractures.

[0175] [Table 2]

[0176]

[0177] [Table 2 (continued)]

[0178]

[0179] <Examples IE5 to IE9>

[0180] use Figure 10 The etched SUS sheet having a thickness of 150 μm or 250 μm shown is used to produce a silicone-laminated metal support, which includes a SUS sheet and a cured silicone product obtained by curing the curable silicone composition prepared by Reference Example 1, wherein the cured silicone product having a certain thickness is adhered to both sides of the SUS sheet having a certain thickness and filled in the through hole. Figure 10 The dimensions of the etched SUS sheets shown are as follows.

[0181] L0 = 1400 μm; L1 = 200 μm; W0 = 100 μm; and W1 = 200 μm.

[0182] Number of rows of through holes = 50

[0183] The silicone laminated metal support was evaluated by the push test, static folding test and dynamic folding test mentioned above. The results of the tests are shown in Table 3 below.

[0184] <Comparative Examples CE7 to CE12>

[0185] A non-etched and flat SUS sheet with a thickness of 50 μm, 150 μm, or 250 μm was used to produce a silicone-laminated metal support comprising a SUS sheet and a cured silicone product obtained by curing the curable silicone composition prepared in Reference Example 1, wherein the cured silicone product having a certain thickness was adhered to both sides of the SUS sheet having a certain thickness. The silicone-laminated metal support was evaluated by the push test, static folding test, and dynamic folding test as mentioned above. The results of the test are also shown in Table 3.

[0186] [Table 3]

[0187]

[0188] [Table 3 (continued)]

[0189]

[0190] <Example IE10>

[0191] By using the silicone-laminated metal support 10 produced in Example IE9, Figure 14 As shown in the foldable display 46. Figure 14 As shown in FIG, 2 , a 25 μm optically clear adhesive 36, a 50 μm polyimide film as a polarizing film 42, a 25 μm optically clear adhesive 38, and a 30 μm glass sheet as a cover window 44 were used as the other components. Foldable display 46 was evaluated by the bending / folding test, pen protection test, and ball drop protection test mentioned below. The test results are further shown in Table 4 below.

[0192] <Comparative Examples CE13 and CE14>

[0193] A comparative foldable display was produced by using a 300 μm cured silicone support (for CE 13) and a polyurethane-laminated metal support (for CE 14) instead of the silicone-laminated metal support 10 produced in Example IE9. The polyurethane-laminated metal support used in Comparative Example CE 14 consisted of a 75 μm polyurethane foam, a 150 μm SUS sheet, and another 75 μm polyurethane foam. The other components in the comparative foldable displays in Comparative Examples CE 13 and CE 14 were the same as those used in Example IE10.

[0194] The comparative foldable display was evaluated by the bending / folding test, pen touch protection test, and ball drop protection test mentioned below. The results of the tests are also shown in Table 4.

[0195] <Static folding test>

[0196] The static folding test verifies the recovery performance after bending at 105°C. The test measures the warpage height after aging. This warpage height is related to the permanent deformation. The test process steps are:

[0197] 1. Prepare unetched or etched metal sheets, and clean the metal sheets with isopropyl alcohol or acetone, and allow them to air dry.

[0198] 2. Prepare the test materials as specified.

[0199] 3. Use Figure 3 As an example of the method for producing the silicone-laminated metal support of the present invention shown in FIG, a test material is coated on the prepared metal sheet.

[0200] 4. Place the metal sheet coated with the test material into a specific temperature oven to cure the test material.

[0201] 5. Fold the coated metal sheet to have a bending radius of 1 mm and clamp the folded metal sheet using a mechanical clamp.

[0202] 6. Place the clamped metal sheets in a high-temperature oven at 105°C for 1,000 hours.

[0203] 7. Release the mechanical clamps and place the sample to be tested on the platform to measure the warpage height.

[0204] Low static folding performance samples show permanent deformation with a warped shape. High static folding performance samples will be flat after aging and release of the bending force in the mechanical fixture.

[0205] <Dynamic folding test>

[0206] The dynamic folding test shows the recovery performance after 200,000 folding cycles at 1 cycle / second at a 1mm folding radius. The test is measured by the warpage height after 200,000 folding cycles. The test process steps are:

[0207] 1. Prepare unetched or etched metal sheets, and clean the metal sheets with isopropyl alcohol or acetone, and allow them to air dry.

[0208] 2. Prepare the test materials as specified.

[0209] 3. Use Figure 3 As an example of the method for producing the silicone-laminated metal support of the present invention shown in FIG, a test material is coated on the prepared metal sheet.

[0210] 4. Place the metal sheet coated with the test material into a specific temperature oven to cure the test material.

[0211] 5. Place the coated metal sheet in a folding / unfolding machine with a 1 mm bending radius at 23°C ± 2°C for 200,000 folding cycles.

[0212] 6. Release the folding / unfolding machine and place the test sample on the platform to measure the warpage height and inspect the etched pattern cracks of the metal sheet.

[0213] Low dynamic folding performance samples show permanent deformation with a warped shape and etched pattern cracks in the metal sheet. High dynamic folding performance samples will be flat with no pattern cracks after the folding cycle test.

[0214] <Pen Stroke Protection Test>

[0215] Pencil protection testing is used to evaluate impact resistance and typically uses a pen drop test method.

[0216] The test process steps are:

[0217] 1. Prepare samples of the multilayer structures produced in Example IE10 and Comparative Examples CE13 / CE14.

[0218] 2. Prepare 0.7 mm BIC orange pen (5.3 g).

[0219] 3. Hold the BIC Orange Pen upright and drop it onto the designated location on the multi-layer structure sample.

[0220] 4. The condition of the substrate was inspected and evaluated based on the following criteria: Good was the absence of scratches and extrusions, and NG was the presence of scratches and extrusions or cracks.

[0221] 5. Record the maximum height the pen falls when in good condition (no scratches or squeezing).

[0222] <Ball drop protection test>

[0223] In the display industry, the ball drop test is used to evaluate impact resistance. The test process steps are:

[0224] 1. Prepare samples of the multilayer structures produced in Example IE10 and Comparative Examples CE13 / CE14.

[0225] 2. Prepare a 20g steel ball.

[0226] 3. Drop the ball vertically to the designated position on the multi-layer structure sample.

[0227] 4. The condition of the substrate was inspected and evaluated based on the following criteria: Good was the absence of scratches and extrusions, and NG was the presence of scratches and extrusions or cracks.

[0228] 5. Record the maximum height the ball falls in good condition (no scratches or squeezing).

[0229] [Table 4]

[0230]

[0231] Industrial Applicability

[0232] Since the silicone-laminated metal support of the present invention can provide good reproducible bendability and good tactile aesthetics (e.g., good touch) for flexible displays, it is advantageous as a bendable support for flexible displays in which high durability is required, such as cholesteric liquid crystal (ChLC) displays, polymer dispersed liquid crystal (PDLC) displays, electrophoretic (EP) displays, and organic light emitting diode (OLED) displays.

[0233] Description of Reference Signs

[0234] 20: Silicone-laminated metal support 36, 37, 38: Optically clear adhesive

[0235] 22: Metal sheet 40: Flexible device / flexible display device

[0236] 24: Cured silicone product 42: Polarizing film

[0237] 26: Fixture 44: Covering Window

[0238] 28: Curable silicone composition 46: Flexible display / foldable display / foldable display device

[0239] 30: Scraper 48: Foldable area

[0240] 32: Substrate

[0241] 34: Through hole

Claims

1. A silicone-laminated metal support (20) for a foldable display (46), wherein the silicone-laminated metal support (20) comprises: A metal sheet (22) having a plurality of through holes (34), and a cured silicone product (24) adhered to at least one side of the metal sheet (22), wherein the through holes (34) are formed to bend the silicone-laminated metal support (20) and are filled with the cured silicone product (24).

2. The silicone laminated metal support (20) for a foldable display (46) according to claim 1, wherein the metal sheet (22) includes copper (Cu), aluminum (Al), titanium (Ti), stainless steel (SUS), nickel-titanium (Ni-Ti), nickel-aluminum (Ni-Al), copper-zinc-nickel (Cu-Zn-Ni), copper-aluminum-nickel (Cu-Al-Ni), copper-aluminum-manganese (Cu-Al-Mn), titanium-nickel-copper-molybdenum (Ti-Ni-Cu-Mo), cobalt-nickel-gallium:iron (Co-Ni-Ga:Fe), silver-nickel (Ag-Ni), gold-cadmium (Au-Cd), iron-platinum (Fe-Pt), iron-nickel (Fe-Ni) or indium-cadmium (In-Cd), or is made thereof.

3. The silicone laminated metal support (20) for a foldable display (46) according to claim 1, wherein the thickness of the metal sheet (22) is in the range of 1 μm to 500 μm.

4. The silicone laminated metal support (20) for a foldable display (46) according to claim 1, wherein the through holes (34) are arranged in a first direction parallel to the metal sheet (22), and wherein they are provided at positions offset in a second direction perpendicular to the first direction.

5. The silicone laminated metal support (20) for a foldable display (46) according to claim 1, wherein the through-hole (34) has a shape of a rectangle, a square, a diamond, a circle, an ellipse or a mixture thereof.

6. The silicone laminated metal support (20) for a foldable display (46) according to claim 1, wherein the cured silicone product (24) has a Shore A hardness of 70 to 95 measured according to ASTM D2240.

7. The silicone laminated metal support (20) for a foldable display (46) according to claim 1, wherein the thickness of the cured silicone product (24) is in the range of 10 μm to 300 μm.

8. The silicone laminated metal support (20) for a foldable display (46) according to claim 1, wherein the cured silicone product (24) is obtained by curing a hydrosilylation curable silicone composition (28).

9. The silicone laminated metal support (20) for a foldable display (46) according to claim 8, wherein the hydrosilylation curable silicone composition (28) comprises: (A) an alkenyl group-containing organopolysiloxane comprising the following components (A1) and (A2): (A1) a linear organopolysiloxane having at least two alkenyl groups per molecule, and (A2) a resinous organopolysiloxane comprising SiO 4 / 2 Unit, R 1 2R 2 SiO 1 / 2 Unit and R 1 3SiO 1 / 2 Unit, where each R 1 is an independently selected monovalent hydrocarbon group free of aliphatic unsaturated bonds, and each R 2 are independently alkenyl groups, provided that the content of the alkenyl groups in component (A2) is from 0.5% to 5.0% by mass, and wherein the R 1 2R 2 SiO 1 / 2 Unit and R 1 3SiO 1 / 2 The total number of moles of units is equal to 1 mole of the SiO 4 / 2 The ratio of the unit is in the range of 0.70 to 1.10, wherein the content of component (A2) is an amount of 45% to 65% by mass of the total mass of components (A1) and (A2); (B) an organopolysiloxane having at least two silicon-bonded hydrogen atoms per molecule, the organopolysiloxane being present in an amount such that the silicon-bonded hydrogen atoms in component (B) are present in an amount of 0.1 to 5 moles per mole of the alkenyl groups in component (A); and (C) A catalytic amount of a hydrosilylation reaction catalyst.

10. A foldable display (46), comprising: a flexible display device (40), and A silicone laminated metal support (20) for a foldable display (46) according to any one of claims 1 to 9.

11. The foldable display (46) of claim 10, wherein the flexible display device (40) is an organic light emitting diode (OLED) device.

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