Abstract: The invention provides a resin composition that is capable of relaxing anisotropy while keeping the crystalline structure derived from liquid crystallinity and that has isotropic structure and physicality from a macroscopic view, even after the melt-processed molded article obtained by applying shear has been molded, cooled and fused without applying shear stress and subsequently re-cooled. The resin composition comprises a liquid crystal polyester resin (A) comprising structural unit (I) derived from a hydroxycarboxylic acid, structural unit (II) derived from a diol compound, and structural unit (III) derived from a dicarboxylic acid, and a resin (B) other than the liquid crystal polyester resin (A), and has an X-ray diffraction measured after fusing the resin composition that satisfies a specific condition.

Abstract: 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 ? H1 at the melting point of the first cycle and the enthalpy change ? H2 at the melting point of the second cycle of the temperature elevation process measured by a differential scanning calorimeter satisfy ? H1/? H2?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?3 or less.

Abstract: The invention provides a resin composition having low dielectric loss tangent and low permittivity as well as having melt molding processability and heat resistance comparable to those of a liquid crystal polyester resin. In particular, the invention provides a resin composition containing a liquid crystal polyester resin (A) comprising: structural unit (I) derived from a hydroxycarboxylic acid, structural unit (II) derived from a diol compound, and structural unit (III) derived from a dicarboxylic acid; and a fluorine resin (B), wherein the dielectric loss tangent is 0.80×10?3 or less and the relative permittivity is 3.50 or less when measured by a split post dielectric resonator (SPDR) method at a measurement frequency of 10 GHz.

Abstract: The invention provides a resin composition that is capable of relaxing anisotropy while keeping the crystalline structure derived from liquid crystallinity and that has isotropic structure and physicality from a macroscopic view, even after the melt-processed molded article obtained by applying shear has been molded, cooled and fused without applying shear stress and subsequently re-cooled. The resin composition comprises a liquid crystal polyester resin (A) comprising structural unit (I) derived from a hydroxycarboxylic acid, structural unit (II) derived from a diol compound, and structural unit (III) derived from a dicarboxylic acid, and a resin (B) other than the liquid crystal polyester resin (A), and has an X-ray diffraction measured after fusing the resin composition that satisfies a specific condition.

Abstract: 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 ? H1 at the melting point of the first cycle and the enthalpy change ? H2 at the melting point of the second cycle of the temperature elevation process measured by a differential scanning calorimeter satisfy ? H1/? H2?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?3 or less.

Abstract: [Problem] To provide a wholly aromatic liquid crystalline polyester resin having an excellent heat resistance and processability while having an extremely low dielectric tangent [Solving means] A wholly aromatic liquid crystalline polyester resin according to the present invention comprises, structural unit (I) derived from p-hydroxybenzoic acid, structural unit (II) derived from 6-hydroxy-2-naphthoic acid, structural unit (III) derived from an aromatic diol compound, structural unit (IV) derived from an aromatic dicarboxylic acid, wherein the composition ratio (mol %) of said structural units (I) to (IV) satisfies the following conditions: 2 mol %?structural unit (I)?9 mol % 40 mol %?structural unit (II)?75 mol % 9 mol %?structural unit (III)?24 mol % 9 mol %?structural unit (IV) 24 mol %.

Abstract: The present invention provides a wholly aromatic liquid crystalline polyester resin having an excellent heat resistance while having an extremely low dielectric tangent.

Abstract: [Problem] To provide a wholly aromatic liquid crystalline polyester resin having an excellent heat resistance and processability while having an extremely low dielectric tangent [Solving means] A wholly aromatic liquid crystalline polyester resin according to the present invention comprises, structural unit (I) derived from p-hydroxybenzoic acid, structural unit (II) derived from 6-hydroxy-2-naphthoic acid, structural unit (III) derived from an aromatic diol compound, structural unit (IV) derived from an aromatic dicarboxylic acid, wherein the composition ratio (mol %) of said structural units (I) to (IV) satisfies the following conditions: 2 mol %?structural unit (I)?9 mol % 40 mol %?structural unit (II)?75 mol % 9 mol %?structural unit (III)?24 mol % 9 mol %?structural unit (IV) 24 mol %.

Abstract: The present invention provides a wholly aromatic liquid crystalline polyester resin having an excellent heat resistance while having an extremely low dielectric tangent.