Provided is a composition capable of forming an optically anisotropic film exhibiting reverse wavelength dispersibility and an Nz factor of about 0.50 (0.40 to 0.60); as well as an optically anisotropic, a circularly polarizing plate, and a display device. The composition includes a non-colorable rod-like compound having an acid group or a salt thereof, a non-colorable plate-like compound having an acid group or a salt thereof, and a salt consisting of a cation and an anion, and exhibiting lyotropic liquid crystallinity, in which a ratio W obtained by Expression (W) is 0.25 to 1.75, and a maximum absorption wavelength in a wavelength range of 230 to 400 nm of the rod-like compound is smaller than a maximum absorption wavelength in a wavelength range of 230 to 400 nm of the plate-like compound.

[00001]$\begin{array}{cc}\mathrm{Ratio}W=\frac{\left(C1+C2+C3\right)-\left(A1+A2\right)}{A2}& \left(W\right)\end{array}$

Provided are a liquid crystal polymer particle in which a difference in contact angle of the liquid crystal polymer particle with water due to a water droplet in air at 25° C. and 50% RH between inside the particle and a surface of the particle is 7° or greater, a liquid crystal polymer particle in which a difference in atomic ratio of an oxygen atom to a carbon atom measured by X-ray photoelectron spectroscopy between inside a particle and a surface of the particle is 0.02 or greater, a method of producing the liquid crystal polymer particle, and a composite material formed of the liquid crystal polymer particle.

An object of the present invention is to provide a liquid crystal polymer film having a low dielectric loss tangent. In addition, an object of the present invention is to provide a laminate having the liquid crystal polymer film.

The liquid crystal polymer film includes a liquid crystal polymer and a filler, in which, in a case where the liquid crystal polymer film includes one kind of the filler, a dielectric loss tangent of the filler under conditions of 25° C. and a frequency of 10 GHz is 0.0020 or less, and in a case where the liquid crystal polymer film includes two or more kinds of the fillers, a mass average value of dielectric loss tangents of the two or more kinds of the fillers under the conditions of 25° C. and a frequency of 10 GHz is 0.0020 or less, and a ratio of a volume occupied by the filler is 10% by volume or more with respect to a total volume of the liquid crystal polymer film.

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 μm or less.

The disclosure discloses a high-frequency transmission LCP film and preparation method thereof. The preparation method comprises the following steps: (1) separately performing acetylation on monomers to obtain acetylated monomers; (2) performing high-temperature polymerization on the acetylated monomers, phenolic resin, acetic anhydride and zinc acetate, and performing pulverization to obtain liquid crystal copolyester; (3) ball milling the liquid crystal copolyester, an inorganic filler, a silane coupling agent and a glass fiber and mixing to obtain a mixture; and melt-plasticizing the mixture to form a film after cooling, performing longitudinal and transverse synchronous stretching, then winding and slitting the film to obtain a high-frequency transmission LCP film. In the disclosure, by adjusting the type and ratio of acetylated monomers and adding phenolic resin, a regular fibrous structure is obtained; and by adding an inorganic filler, a silane coupling agent and glass fibers, its mechanical properties are enhanced and dielectric loss is reduced, thereby obtaining an LCP film with low dielectric constant and low dielectric loss factor which can be applied to the fields of electronics, electricity, optical fiber, 5G communication and the like.

A polymer composition comprising from about 50 wt. % to about 90 wt. % of a polymer matrix, from about 10 wt. % to about 40 wt. % of inorganic filler particles, and from about 0.1 wt. % to about 10 wt. % of an impact modifier is provided. The polymer matrix includes a liquid crystalline polymer containing one or more repeating units derived from a hydroxycarboxylic acid, wherein the hydroxycarboxylic acid repeating units constitute about 50 mol. % or more of the polymer, and further wherein the liquid crystalline polymer containing repeating units derived from naphthenic hydroxycarboxylic and/or dicarboxylic acids in an amount of about 10 mol. % or more of the polymer. The polymer composition exhibits a tensile elongation of about 4.5% or more and a Charpy notched impact strength of about 100/m.sup.2 or more.

A liquid crystal polymer composite film is formed from a resin composite including one or more liquid crystal polymers and one or more fillers. The liquid crystal polymer composite film has a thickness in the range of 10 μm-200 μm and a ratio of the in-plane dielectric permittivity in the machine direction to the transverse direction in the range of 1.0-1.4 over a frequency range of 1 Ghz to 10 Ghz. A metal-clad laminate includes the liquid crystal polymer composite film and a metal clad layer laminated to a major surface of the liquid crystal polymer composite film. The metal-clad laminate may be included as part of an antenna.

A photoplethysmographic sensor comprising a light source for emitting light onto a tissue and an optical detector for receiving light that interacts with the tissue is provided. The sensor comprises a liquid crystalline polymer.

A liquid crystal polyester resin composition containing 100 parts by mass of a liquid crystal polyester resin; and at least 10 parts by mass and at most 100 parts by mass of glass components; wherein the glass components contain glass fibers having a length of more than 30 μm and glass fine powders having a length of at least 4 μm and at most 30 μm; the number-average fiber length of the glass fibers is at least 50 μm and at most 200 μm; and the content of the fine powders is at least 50% and at most 95% relative to a total number of the glass components.

A liquid crystal polymer including structural units derived from an aromatic hydroxy carboxylic acid in an amount of greater than about 30 mol % and less than or equal to about 50 mol %, an aromatic dicarboxylic acid which includes about 50 mol % or greater of a structural unit derived from a compound including two carboxyl groups at a meta-position of an aromatic ring in an amount greater than or equal to about 50 mol % of the amount of the structural unit derived from the aromatic hydroxy carboxylic acid, each based on total moles of the structural units in the liquid crystal polymer, and an aromatic diol that is 4,4′-dihydroxybiphenyl, hydroquinone, or a combination thereof; a composite composition including the liquid crystal polymer, an article produced from the liquid crystal polymer or the composite composition, a battery case including the article, and a battery including the battery case and an electrode assembly.