A medical device capable of transmitting a radiofrequency signal to and/or receiving a radiofrequency signal from an external device is provided. The medical device comprises at least one component that contains a polymer composition that exhibits a dielectric constant of greater than about 6 at a frequency of 2 GHz, wherein the polymer composition includes a liquid crystalline polymer.

An aspect of the present disclosure is a composition that includes ##STR00001##
where R.sup.1 includes at least one of a saturated hydrocarbon and/or an unsaturated hydrocarbon, R.sup.3 includes at least one of a saturated hydrocarbon and/or an unsaturated hydrocarbon, A includes at least one of a saturated hydrocarbon or an unsaturated hydrocarbon, 1≤x≤1000, and 1≤y≤1000.

An aspect of the present disclosure is a composition that includes ##STR00001##
where R.sup.1 includes at least one of a saturated hydrocarbon and/or an unsaturated hydrocarbon, R.sup.3 includes at least one of a saturated hydrocarbon and/or an unsaturated hydrocarbon, A includes at least one of a saturated hydrocarbon or an unsaturated hydrocarbon, 1≤x≤1000, and 1≤y≤1000.

The invention provides a resin molded article containing a wholly aromatic liquid crystalline polyester resin and formed by being subjected to heat treatment, in which the enthalpy change Δ H.sub.1 at the melting point of the first cycle and the enthalpy change Δ H.sub.2 at the melting point of the second cycle of the temperature elevation process measured by a differential scanning calorimeter satisfy Δ H.sub.1/Δ H.sub.2≥2.0, and the dielectric loss tangent measured by the split-post dielectric resonator (SPDR) method at a measurement frequency of 10 GHz is 0.85×10.sup.−3 or less.

The present disclosure discloses a butenediol-based polyester elastomer and a method for preparing same. In the present disclosure, 1,4-butenediol containing high-stability double-bond is used to replace itaconic acid, and a series of butenediol-based polyester elastomers with high molecular weight and narrow distribution are synthesized, which have high relative molecular weight and narrow relative molecular weight distribution. The crosslinking in subsequent processing is more controllable, and the dosage of a vulcanizing agent is equivalent to that of traditional rubber.

The present disclosure discloses a butenediol-based polyester elastomer and a method for preparing same. In the present disclosure, 1,4-butenediol containing high-stability double-bond is used to replace itaconic acid, and a series of butenediol-based polyester elastomers with high molecular weight and narrow distribution are synthesized, which have high relative molecular weight and narrow relative molecular weight distribution. The crosslinking in subsequent processing is more controllable, and the dosage of a vulcanizing agent is equivalent to that of traditional rubber.

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.

A liquid crystal polyester wherein a linear liquid crystal polymer chain including specific monomers (A) to (C), in which at least one of the monomer (B) and the monomer (C) contains a compound for forming a bent structural unit, and a content of the compound for forming a bent structural unit is 20 to 40% by mol relative to a total molar amount of the monomers (A) to (C), is bonded via a specific monomer (D), and a content proportion of the monomer (D) is 0.01 to 10 mol relative to 100 mol of the total molar amount of the monomers (A) to (C).

A liquid-crystal polymer includes at least one repeating unit having a spiro structure, and the repeating unit occupies 1 mol % to 20 mol % of the liquid-crystal polymer. The liquid-crystal polymer is composed of the following repeating units: 1 mol % to 20 mol % of ##STR00001##
10 mol % to 35 mol % of ##STR00002##
10 mol % to 35 mol % of ##STR00003##
10 mol % to
50 mol % of ##STR00004##
and 10 mol % to 40 mol % of ##STR00005##
AR.sup.1 is ##STR00006##
wherein each of ring R and ring S is independently a C.sub.3-20 ring, ring R and ring S share a carbon atom, and each of K.sup.1 and K.sup.2 is independently a C.sub.5-20 conjugated system. Each of AR.sup.2, AR.sup.3, AR.sup.4, and AR.sup.5 is independently AR.sup.6 or AR.sup.6—Z—AR.sup.7.

An effect paint for automobiles, comprising water, a dispersant (A), cellulose nanofibers (B), and an effect pigment (C).