Provided herein is a method for manufacturing a polyimide film, the method including the steps of: preparing a polyamic acid solution; preparing a polyamic acid composition by adding a dehydrating agent and an imidizing catalyst to the polyamic acid solution; and applying the polyamic acid to a support to form a film, followed by thermosetting the film in a heater, wherein the thermosetting step comprises a first heating step, a second heating step, and a third heating step, each of the first, the second, and the third step being carried out in a processing temperature range of 100° C. to 550° C.

The present invention aims to provide a multi-layer sheet with excellent electromagnetic wave shielding properties. The multi-layer sheet includes an alternating multilayer unit with five or more A layer and B layer alternately laminated, in which the electromagnetic return loss at the peak top in the peak of return loss spectrum with the highest return loss at the peak top is 5 dB or more in a chart of the return loss in the multi-layer sheet.

A method of manufacturing a metal-clad laminate and uses of the same are provided. The method comprises the following steps: (a) impregnating a reinforcement material with a first fluoropolymer solution, and drying the impregnated reinforcement material under a first temperature to obtain a first prepreg; (b) impregnating the first prepreg with a second fluoropolymer solution, and drying the impregnated first prepreg under a second temperature to obtain a second prepreg; and (c) laminating the second prepreg and a metal-clad to obtain a metal-clad laminate, wherein the first fluoropolymer solution has a first fluoropolymer, the second fluoropolymer solution has a second fluoropolymer, and the first fluoropolymer and the second fluoropolymer are different.

An electromagnetic wave shielding sheet according to the disclosure is configured by a protection layer, a metal layer, and a conductive adhesive layer. The metal layer has a plurality of openings, and an aperture ratio of the opening is 0.1%-20%. In addition, a tensile breaking strength of the electromagnetic wave shielding sheet is 10 N/20 mm-80 N/20 mm.

An object of the present invention is to provide a heat dissipation sheet having high thermal conductivity in the thickness direction. The present invention provides a heat dissipation sheet having a structure in which at least two thermally conductive insulation layers are laminated, wherein the lamination direction of the thermally conductive insulation layers is substantially perpendicular to the thickness direction of the heat dissipation sheet, and wherein for the entire cross-section perpendicular to the in-plane direction of the heat dissipation sheet, the thermally conductive insulation layer contains 75 to 97% by area of insulating particles, 3 to 25% by area of a binder resin, and 10% by area or less of voids.

Disclosed herein is a polyimide film that is obtained by imidizing a polyamic acid solution containing two or more dianhydride components selected from the group consisting of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA), 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), and pyromellitic dianhydride (PMDA), and a diamine component including m-tolidine and p-phenylenediamine (PPD) and has a glass transition temperature (Tg) of 320° C. or higher, a moisture absorption rate of 0.4% or less, and a dielectric dissipation factor (Df) of 0.004 or less.

A material includes one or more transparent substrates comprising two main faces, wherein one of the faces of one of the substrates is coated with a functional coating which can have an effect on solar radiation and/or infrared radiation, and a face not coated with the functional coating of one of the substrates includes a reflective color-adjustment coating comprising at least one dielectric layer including a reflective dielectric layer with a thickness of between 2 and 100 nm, all the dielectric layers of the reflective color-adjustment coating have a thickness of less than 100 nm.

Sensors, methods of producing sensors, and methods of measuring sensitivities of sensors are disclosed herein. A sensor includes a nanocomposite material having a thermoplastic polyurethane base. A method of producing a sensor includes embedding a plurality of carbon nanotubes into a thermoplastic polyurethane base and diluting a concentration of the plurality of carbon nanotubes embedded into the thermoplastic polyurethane base.

There is provided a resin composition exhibiting excellent dielectric properties, high adhesion to a low-roughness surface, heat resistance, and excellent water resistance. This resin composition includes (a) a polymer having a polyphenylene ether backbone and a butadiene backbone in one molecule and having at least one selected from the group consisting of a vinyl group, a styryl group, an allyl group, an ethynyl group and a (meth)acryloyl group and at least any one of (b) a polymer including a styrene butadiene backbone and (c) a polymer including a cycloolefin backbone, wherein the content is the component (a) of 15 to 60 parts by weight and the total content of the component (b) and the component (c) is 40 to 85 parts by weight, based on 100 parts by weight of the total content of the component (a), the component (b), and the component (c).

Disclosed herein are nanostructured plasmonic materials. The nanostructured plasmonic materials can include a first nanostructured layer comprising: a first layer of a first plasmonic material permeated by a first plurality of spaced-apart holes, wherein the first plurality of spaced apart holes comprise a first array; and a second nanostructured layer comprising a second layer of a second plasmonic material permeated by a second plurality of spaced-apart holes, wherein the second plurality of spaced apart holes comprise a second array; wherein the second nanostructured layer is located proximate the first nanostructured layer; and wherein the first principle axis of the first array is rotated at a rotation angle compared to the first principle axis of the second array.