The polyester film according to the embodiment can maintain its original characteristics even after a plurality of repeated folding by adjusting the deformed dimension as compared with the initial dimension of the film, in particular, by adjusting the ratio between the deformed dimensions in two in-plane directions perpendicular to each other to a specific range, in the cycle of straining and relaxing the film. Accordingly, the polyester film can be applied to a cover of a flexible display device, in particular, a foldable display device to exhibit excellent characteristics.

A liquid crystal polyester resin for laminate, wherein, in a molecular weight distribution of an absolute molecular weight measured by a gel permeation chromatograph/light scattering method, an area fraction of a portion having an absolute molecular weight of 10,000 or less is 10 to 40%, and an area fraction of a portion having an absolute molecular weight of 50,000 or more is 3 to 20%, relative to 100% of the total peak area.

Disclosed herein are ropes containing bundles of filaments, where each bundle includes at least 70% by volume of liquid crystal polymer filaments, and where at least one bundle includes liquid crystal polymer filaments of at least 10 denier per filament in size. Also disclosed herein are methods of pulling or lifting an object by applying tension to such a rope connected to the object, where the rope is arranged over a sheave or a non-rotating guide surface, and a ratio of a diameter of the sheave or an effective diameter of the non-rotating guide surface, D, to a diameter of the rope, d, is at least 20:1.

The present invention relates to a liquid crystal polyester resin molded article containing a thermoplastic resin comprising a liquid crystal polyester and a fibrous filler, in which the liquid crystal polyester resin molded article contain the fibrous filler in an amount of equal to or greater than 1 part by mass and equal to or smaller than 120 parts by mass with respect to 100 parts by mass of the thermoplastic resin, the proportion of the liquid crystal polyester with respect to 100 mass % of the thermoplastic resin is equal to or greater than 75 mass % and equal to or smaller than 100 mass %, and a length-weighted average fiber length of the fibrous filler is equal to or greater than 0.7 mm.

Provided is an LCP extruded film that can increase process tolerance in manufacture of a flexible laminate, without excessively impairing the basic performance of the liquid crystal polymer. Provided are an LCP extruded film and the like that allow a flexible laminate having high peel strength to a metal foil to be easily obtained under mild manufacturing conditions as compared with the prior art. An LCP extruded film 11 comprising: an aromatic polyester-based liquid crystal polymer at least having at least one selected from the group consisting of para-hydroxybenzoic acid, terephthalic acid, isophthalic acid, 6-naphthalenedicarboxylic acid, 4,4′-biphenol, bisphenol A, hydroquinone, 4,4-dihydroxybiphenol, ethylene terephthalate and derivatives thereof, and 6-hydroxy-2-naphthoic acid and derivatives thereof, as monomer components, the LCP extruded film having a dissolution rate in pentafluorophenol at 60° C. of 25% or more.

A polymer composition for use in an electric circuit protection device is provided. The polymer composition comprises a polymer matrix that includes a thermotropic liquid crystalline polymer. The polymer composition exhibits an in-plane thermal conductivity of about 3.5 W/m-K or more as determined in accordance with ASTM E1461-13 and a melt viscosity of from about 1 to about 100 Pa-s as determined in accordance with ISO Test No. 11443:2014 at a temperature 15° C. higher than the melting temperature.

A polymer composition comprising a semiconductive material distributed within a polymer matrix is provided. The semiconductive material includes inorganic particles and an electrically conductive material, the inorganic particles having an average particle size of from about 0.1 to about 100 μm and an electrical conductivity about 500 μS/cm or less. The polymer matrix contains at least one thermoplastic high performance polymer having a deflection under load of about 40° C. or more. The polymer composition exhibits a dielectric constant of about 4 or more and a dissipation factor of about 0.3 or less, as determined at a frequency of 2 GHz.

A terminally-functionalized derivative of a cashew nut shell liquid (CNSL) compound, a method to form a polymer, and an article of manufacture comprising a polymer derived from the terminally-functionalized CNSL derivative. The terminally-functionalized CNSL derivative has two, three, four, or five reactive functional groups. The polymer is prepared by obtaining CNSL compounds, reacting the CNSL compounds to form the terminally-functionalized CNSL derivative, and polymerizing the terminally-functionalized CNSL derivative.

Provided is a polycarbonate of Chemical Formula 1:

##STR00001## wherein in Chemical Formula 1: Ar is C.sub.6-60 arylene unsubstituted or substituted with C.sub.1-10 alkyl; and n and m are each independently an integer from 1 to 50, provided that n+m is 2 or more and a preparation method thereof.

Provided are a laminate, a circuit board, and a liquid crystal polymer (LCP) film comprised therein. The laminate comprises a metal foil and an LCP film. The LCP film in the laminate has a dissipation factor before water absorption (Df′.sub.0), a dissipation factor after water absorption (Df′.sub.1), and a relative percentage difference between dissipation factors (ΔDf′), which is calculated by the following equation: $\Delta {\mathrm{Df}}^{\prime }\left(\%\right)=\frac{.Math.{\mathrm{Df}}_1^{\prime }-{\mathrm{Df}}_0^{\prime }.Math.}{{\mathrm{Df}}_0^{\prime }}\times 100\%;$
wherein ΔDf′ may be less than or equal to 16%. By controlling ΔDf′ of the LCP film in the laminate, the insertion loss of a circuit board comprising a laminate during signal transmission in low-, medium-, and/or high-frequency bands is decreased and/or inhibited. In addition, the difference between the insertion losses of signal transmission before and after water absorption is decreased, so the laminate is suitable for high-end or outdoor high-frequency electronic products.