The present application relates to a circularly polarizing plate and a use thereof. The present application can provide a circularly polarizing plate, which can be applied to a display device such as an organic light emitting display device to minimize blocking of light in the visible light region affecting image quality while blocking harmful ultraviolet rays appropriately and also has excellent durability. In addition, the present application can provide a circularly polarizing plate having excellent compensation characteristics at a viewing angle while ensuring process simplification and cost competitiveness.

A method of manufacturing a liquid crystal polymer film, which includes the following operations: providing a liquid crystal polymer powder; uniformly dispersing the liquid crystal polymer powder in a solvent to form a mixed solution; coating the mixed solution on a carrier board to form a coating layer; heating the coating layer to a first temperature to remove the solvent in the coating layer; heating the liquid crystal polymer powder to a second temperature after the solvent is removed to form the liquid crystal polymer film.

Some variations provide an anisotropic thermally conductive polymer composition comprising a plurality of polarizable, thermotropic main-chain liquid-crystal polymer molecules with crystalline domains. The liquid-crystal polymer molecules are in a nematic phase or a smectic phase, and at least 80% of the crystalline domains are aligned along a crystal axis. A method of making an anisotropic thermally conductive polymer composition comprises: synthesizing or obtaining a polymer containing polarizable domains; heating the polymer to form a polymer melt; cooling the polymer melt to form a thermotropic liquid-crystal polymer; exposing the thermotropic liquid-crystal polymer to an electrical field, thereby aligning the polarizable domains along a crystal axis; and recovering the thermotropic liquid-crystal polymer as an anisotropic thermally conductive polymer composition. The polymer composition may be formed into an object characterized by thermal conductivity along the minimum dimension that is at least three times greater than thermal conductivity along the maximum dimension.

A camera module containing a molded part (e.g., generally planar base, lens barrel mounted on the base, etc.) that is formed form a polymer composition is provided. The polymer composition includes a liquid crystalline polymer and inorganic particles that have a hardness value of about 2.5 or more based on the Mohs hardness scale.

A liquid crystal polyester resin composition including a liquid crystal polyester resin, 15 parts by mass or more and 100 parts by mass or less of a carbon fiber with respect to 100 parts by mass of the liquid crystal polyester resin, and 0.001 parts by mass or more and 0.02 parts by mass or less of a fullerene with respect to 100 parts by mass of the carbon fiber.

This liquid-crystal polyester multifilament has a compression yield stress of 15-40 mN/dtex. The present invention provides a liquid-crystal polyester multifilament with which it is possible to realize much higher flexural fatigue resistance in comparison with the prior art when used in a high-level processed product.

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.

A microneedle assembly that is capable of transdermal delivery of a drug compound, such as a vaccine, (e.g., vaccine) across a dermal barrier of a subject (e.g., human), and/or detecting the presence of an analyte in the subject is provided. The microneedle assembly comprises a plurality of microneedles arranged on a support that each contain a tip and base, one or both of which are formed from a polymer composition that includes a liquid crystalline polymer. By selectively controlling the specific components of the polymer composition, as well as their relative concentration, the resulting microneedles may exhibit a high degree of physical alignment, which can help ensure better performance during use of the microneedle assembly.

A compact camera module that contains a generally planar base on which is mounted a lens barrel is provided. The base, barrel, or both are molded from a polymer composition that includes a thermotropic liquid crystalline polymer and a plurality of mineral fibers (also known as “whisker”). The mineral fibers have a median width of from about 1 to about 35 micrometers and constitute from about 5 wt % to about 60 wt % of the polymer composition.

A camera module comprising a polymer composition that includes a polymer matrix containing a liquid crystalline polymer and a mineral filler is provided. The liquid crystalline polymer contains repeating units derived from naphthenic hydroxycarboxylic and/or dicarboxylic acids in an amount of about 10 mol. % or more of the polymer. Further, the polymer composition exhibits a melt viscosity of from about 30 to about 400 Pa-s, as determined at a shear rate of 400 seconds.sup.−1 and at a temperature 15° C. higher than the melting temperature of the composition in accordance with ISO Test No. 11443:2005.