Abstract: A solder ball with a concave-convex structure is provided. The solder ball with a concave-convex structure includes tin-bismuth alloy including a plurality of concave portions and convex portions on its surface. The height difference between the concave portions and the convex portions is between about 10 nanometers and about 200 nanometers. The proportion of tin in the tin-bismuth alloy is between about 28% and about 52%. A method for preparing the solder ball with a concave-convex structure is also provided.

Abstract: An anhydride compound, polyimide, and thin film are provided. The anhydride compound has a chemical structure of wherein R1 is each of R4 is independently C1-6 alkylene group, m is an integer of 0 to 10, and m? is an integer of 1 to 10; n is an integer of 1 to 10, each of R2 is independently hydrogen, saturated or unsaturated C1-6 hydrocarbon group, CF3, silanol group, silyl group, or Al(OH)3; and R3 is silanol group, silyl group, or Al(OH)3. The anhydride compound can be reacted with a diamine compound to form a polyimide.

Abstract: A polymer and a resin composition thereof are provided. The polymer includes a first repeat unit represented by Formula (I) and a second repeat unit represented by Formula (II) wherein A1 is C24-48 alkylene, C24-48 alkenylene, C24-48 alkynylene, C24-48 alicyclic alkylene, C24-48 alicyclic alkenylene, or C24-48 alicyclic alkynylene. A2 and A4, independently having at least one reactive group, are independently C6-25 arylene, C4-8 cycloalkylene, C5-25 heteroarylene, divalent C7-25 alkylaryl, divalent C7-25 acylaryl, divalent C6-25 aryl ether, divalent C7-25 acyloxyaryl, or divalent C6-25 sulfonylaryl; and, A3 is substituted or unsubstituted C6-25 arylene, C4-8 cycloalkylene, C5-25 heteroarylene, divalent C7-25 alkylaryl, divalent C7-25 acylaryl, divalent C6-25 aryl ether, divalent C7-25 acyloxyaryl, or divalent C6-25 sulfonylaryl.

Abstract: A compound, a resin composition and a laminated substrate thereof are provided. The compound has a structure represented by Formula (I) wherein A1 is C24-48 alkylene group, C24-48 alkenylene group, C24-48 alkynylene group, C24-48 alicyclic alkylene group, C24-48 alicyclic alkenylene group, or C24-48 alicyclic alkynylene group. A2 is C2-12 alkylene group, C6-C25 arylene group with two reactive groups, C4-8 cycloalkylene group, C5-25 heteroarylene group, divalent C7-C25 alkylaryl group, divalent C7-25 acylaryl group, divalent C6-25 aryl ether group, or divalent C7-25 acyloxyaryl group; and, n?1.

Abstract: A composition, an insulating material, and a method for preparing an insulating material are provided. The composition includes (a) 100 parts by weight of oligomer of Formula (I) (b) 20-50 parts by weight of polymer having at least two reactive functional groups, wherein the reactive functional group is a reactive-double-bond-containing functional group; (c) 1-5 parts by weight of photoinitiator; (d) 0.5-2 parts by weight of thermal initiator; and (e) 0.5-2 parts by weight of photoacid generator.

Abstract: A composition, an insulating material, and a method for preparing an insulating material are provided. The composition includes (a) 100 parts by weight of oligomer of Formula (I) (b) 20-50 parts by weight of polymer having at least two reactive functional groups, wherein the reactive functional group is a reactive-double-bond-containing functional group; (c) 1-5 parts by weight of photoinitiator; (d) 0.5-2 parts by weight of thermal initiator; and (e) 0.5-2 parts by weight of photoacid generator.

Abstract: A solventless resin composition with a low dielectric constant and a substrate structure are provided. The composition includes: (a) 20-50 parts by weight of a copolymer having the structure of Formula (I) wherein, i, j, k, l, and m are independently an integer from 1 to 10; (b) 50-80 parts by weight of a compound having the structure of Formula (II) (c) 80-100 parts by weight of a hardener; and (d) 70-100 parts by weight of an inorganic filler.

Abstract: An adhesive composition and a composite substrate employing the same are provided. The adhesive composition includes a compound having a structure represented by Formula (I) (Z—Y?3X??Formula (I) , wherein X is R can be hydrogen, or C1-6 alkyl group; each Y can be independently a moiety polymerized by at least two different phenol-based compounds; and each Z can be independently hydrogen, acryloyl group, allyl group, vinylbenzyl group, epoxypropyl group, methylacryloyl group, propargyl group, or cyanoallyl group; a thermoplastic elastomer; an epoxy resin; and a bismaleimide.

Abstract: The present invention discloses a new metal cyano-substituted benzimidazolide salt having formula (I) and its preparation. This new cyano-substituted benzimidazole derivatives exhibited excellent thermal stability. The organic salt of the present invention were soluble in an alkyl carbonate solvent, such as propylene carbonate (PC), dimethyl carbonate (DMC) and ethylene carbonate (EC)/DMC cosolvent. The non-aqueous electrolyte prepared by mixing the organic metal salt of the present invention with the alkyl carbonate solvent shows high conductivity and excellent electrochemical stability. The non-aqueous electrolyte is suitable for use in primary or secondary rechargeable batteries.

Abstract: A solventless resin composition with a low dielectric constant and a substrate structure are provided. The composition includes: (a) 20-50 parts by weight of a copolymer having the structure of Formula (I) wherein, i, j, k, l, and m are independently an integer from 1 to 10; (b) 50-80 parts by weight of a compound having the structure of Formula (II) (c) 80-100 parts by weight of a hardener; and (d) 70-100 parts by weight of an inorganic filler.

Abstract: A polymer, a method for preparing the same, and a photosensitive resin composition thereof are provided. The polymer has a structure represented by Formula (I): wherein R1 is —OH, or —COOH; A1 is each A2 is independently each A3 is independently Z is —O—, —S—, —C(CH3)2-, —C(CF3)2-, m is a positive integer that is greater than 1; n is a positive integer that is greater than 1; i is a positive integer between 1 and 3; and, j is a positive integer between 1 and 20; and, the repeat units are arranged in a random fashion.

Abstract: The present invention discloses a new metal cyano-substituted benzimidazolide salt having formula (I) and its preparation. This new cyano-substituted benzimidazole derivatives exhibited excellent thermal stability. The organic salt of the present invention were soluble in an alkyl carbonate solvent, such as propylene carbonate (PC), dimethyl carbonate (DMC) and ethylene carbonate (EC)/DMC cosolvent. The non-aqueous electrolyte prepared by mixing the organic metal salt of the present invention with the alkyl carbonate solvent shows high conductivity and excellent electrochemical stability. The non-aqueous electrolyte is suitable for use in primary or secondary rechargeable batteries.

Abstract: A transparent speaker is suitable for being disposed on a display panel. The transparent speaker includes a transparent membrane, a transparent electrode plate, and spacers. Each transparent electrode plate has a plurality of openings. The display panel includes a plurality of pixels. The pixels emit optical signals. A Moire spatial period of the optical signals is less than 600 ?m after the optical signals pass through the transparent speaker. When the transparent speaker is disposed on the display panel, a user is able to watch an image on the display panel through the transparent speaker without being interfered by a Moire.

Abstract: A transparent speaker is suitable for being disposed on a display panel. The transparent speaker includes a transparent membrane, a transparent electrode plate, and spacers. Each transparent electrode plate has a plurality of openings. The display panel includes a plurality of pixels. The pixels emit optical signals. A Moire spatial period of the optical signals is less than 600 ?m after the optical signals pass through the transparent speaker. When the transparent speaker is disposed on the display panel, a user is able to watch an image on the display panel through the transparent speaker without being interfered by a Moire.

Abstract: The present invention is directed to a negative photoresist composition which mainly is composed of a) a polyimide having pendant carboxyl groups, wherein a portion of the carboxyl groups reacted with glycidyl (meth)acrylate monomers to form covalent bonds. The photoresist composition further contains b) monomers having a tertiary amino group and a C?C double bond, which form ionic bonds with the remaining hydroxyl groups of the polyimide. The photoresist composition further contains c) a photoinitiator which is also called photosensitizer. The components a) to c) are all dissolved in a solvent.

Abstract: The present invention is directed to a negative photoresist composition which mainly is composed of a) a polyimide having pendant carboxyl groups, wherein a portion of the carboxyl groups reacted with glycidyl (meth)acrylate monomers to form covalent bonds. The photoresist composition further contains b) monomers having a tertiary amino group and a C?C double bond, which form ionic bonds with the remaining hydroxyl groups of the polyimide. The photoresist composition further contains c) a photoinitiator which is also called photosensitizer. The components a) to c) are all dissolved in a solvent.

Abstract: A coating composition of positive photosensitive polyimide is disclosed, which includes an organic solvent and the following components dissolved in the organic solvent: (a) a polyimide having a phenolic hydroxyl group or carboxyl group at the end of a principal chain of the polymer; (b) a compound having a phenolic hydroxyl group; and (c) a quinonediazide sulfonate as a photosensitive agent. The amount of the components (b) and (c) are 1-50 parts by weight per 100 parts by weight the component (a) in the coating composition. A film of the coating composition can be developed with an alkaline aqueous solution, which has a high photosensitivity, excellent resolution, low post-cure temperature, high film residual rate in thickness, and a pattern having a tapered-angle at the cross section. The coating solution can be used for forming an insulating layer in displays or in other suitable applications.