Abstract: An object of the present invention is to provide a polymer film having a more excellent adhesiveness to a metal layer. In addition, another object of the present invention is to provide a laminate having the polymer film. The polymer film of an embodiment of the present invention is a polymer film including a polymer and having a dielectric loss tangent of 0.005 or less under the conditions of a temperature of 23° C. and a frequency of 28 GHz, in which a relaxation peak disappearance temperature of a relaxation peak in a frequency dependence of the dielectric loss tangent of the polymer film is ?80° C. or higher. In addition, the polymer film of the embodiment of the present invention is a polymer film including a polymer and having a dielectric loss tangent of 0.005 or less under the conditions of a temperature of 23° C. and a frequency of 28 GHz, in which an A value obtained by a predetermined measurement method is 1 to 60 eq/t.

Abstract: An object of the present invention is to provide a polymer film to which a metal-containing layer is stuck to produce a laminate having an excellent peel strength. Another object of the present invention is to provide a laminate and a substrate for high-speed communication. The polymer film of an embodiment of the present invention is a polymer film including a liquid crystal polymer, in which a difference between a melting start temperature and a melting end temperature in differential scanning calorimetry in a depth region up to 10 ?m of the polymer film from one surface toward the other surface of the polymer film is 5.0° C. to 50° C.

Abstract: An object of the present invention is to provide a polymer film to which a metal-containing layer is stuck to produce a laminate having an excellent peel strength. Another object of the present invention is to provide a laminate and a substrate for high-speed communication. The polymer film of an embodiment of the present invention is a polymer film including a liquid crystal polymer, in which a difference between a melting start temperature and a melting end temperature in differential scanning calorimetry in a depth region up to 10 ?m of the polymer film from one surface toward the other surface of the polymer film is 5.0° C. to 50° C.

Abstract: An object of the present invention is to provide a polymer film having a small anisotropy of linear expansion factor. Another object of the present invention is to provide a substrate for communication including the polymer film. The polymer film of the present invention is a polymer film including a liquid crystal polymer, in which, in a case of observing a surface of the polymer film under a crossed nicol environment with a polarization microscope, a plurality of bright portions are observed in an observation region, and in the plurality of bright portions, an equivalent circle diameter of a bright portion having a maximum equivalent circle diameter is 10 ?m or less.

Abstract: The present invention provides a liquid crystal polymer film having good smoothness and surface properties and having reduced anisotropy. In addition, the present invention provides a substrate for high-speed communication relating to the liquid crystal polymer film. The liquid crystal polymer film of the present invention includes a liquid crystal polymer component and at least one component selected from the group consisting of an olefin component, a cross-linking component, and a compatible component.

Abstract: A laminated film having, in order: a layer containing a thermoplastic polymer A with a thickness of 5 nm to 1,000 nm; a layer containing a water-soluble thermoplastic polymer B; and a layer containing a thermoplastic polymer C, the layers being adjacent to each other, in which the layer containing the thermoplastic polymer A contains no organic solvent, or an organic solvent content in the layer containing the thermoplastic polymer A is greater than 0 mass % and less than 0.01 mass % with respect to a total mass of the layer containing the thermoplastic polymer A and a method of manufacturing the laminated film, a polymer film and a method of manufacturing the polymer film, and a roll.

Abstract: Provided are a white polyester film including a polyester and white particles having an average primary particle diameter of 0.20 to 0.40 ?m, in which a content of the white particles is 1.0% to 5.0% by mass with respect to the total mass of the film, a ratio of agglomerated particles having particle diameters of 0.40 to 0.80 ?m in a direction parallel to a surface direction of the film on the cross-section of the film to the total number of primary particles and agglomerated particles of the white particles dispersed in the film is 10% to 20% by number, and a concentration of terminal carboxyl groups is 6 to 30 equivalents/ton, a method for manufacturing the same, a solar cell back sheet, and a solar cell module.