Abstract: A liquid-crystalline polyester blend composition includes 100 parts by weight of a liquid-crystalline polyester blend and 0.1-300 parts by weight of calcium titanate and/or barium titanate, wherein the liquid-crystalline polyester blend can be obtained by combining liquid-crystalline polyester (A) (LCP A) and liquid-crystalline polyester (B) (LCP B) such that the ratio by weight of (LCP A)/(LCP B) is 99/1 to 80/20, wherein LCP A and LCP B are as defined in the specification, provided that at least one of LCP A and LCP B includes one or two repeating units that come from corresponding minor copolymerizing components selected from aromatic diol, aromatic dicarboxylic acid, aromatic monocarboxylic acid and aromatic monohydroxy compound.

Abstract: The present invention provides a wholly aromatic liquid-crystalline polyester consisting of the repeating units represented by formulae (I), (II), (III) and (IV): wherein: the molar proportion of the repeating unit represented by formula (I) based on the total repeating units constituting the wholly aromatic liquid-crystalline polyester is 40-80 mol %; the molar ratio of the total amount of the repeating units represented by formulae (II) and (III) to the repeating unit represented by formula (IV) is from 90/100 to 100/90; the molar proportion of the repeating unit represented by formula (II) based on the total amount of the repeating units represented by formulae (II) and (III) is 80-99.9 mol%; and the two “—O—” attached to the benzene ring in formula (III) are positioned meta or para to each other and “Ar” in formula (IV) represents a bivalent aromatic group.

Abstract: The present invention provides a liquid-crystalline polyester blend composition comprising 100 parts by weight of a liquid-crystalline polyester blend and 0.1-300 parts by weight of calcium titanate and/or barium titanate: wherein said liquid-crystalline polyester blend is obtainable by combining liquid-crystalline polyester (A) (LCP A) and liquid-crystalline polyester (B) (LCP B) such that the ratio by weight of (LCP A)/(LCP B) is 99/1 to 80/20; wherein, LCP A consists of 100 molar parts of major repeating units and optionally 0.

Abstract: The present invention provides a liquid-crystalline polyester blend, which is obtained by combining a liquid-crystalline polyester (A) and a liquid-crystalline polyester (B) such that the ratio by weight of (A)/(B) is 99/1 to 80/20: liquid-crystalline polyester (A) which consists of aromatic oxycarbonyl repeating units, aromatic dioxy repeating units and aromatic dicarbonyl repeating units, and contains 40-80 mol % of the repeating unit represented by formula (I) based on the total repeating units constituting the liquid-crystalline polyester (A); liquid-crystalline polyester (B) which comprises repeating units represented by formulae (I) and (II), wherein the molar proportion of the total amount of the repeating units represented by formulae (I) and (II) based on the total amount of the repeating units constituting the liquid-crystalline polyester (B) is greater than or equal to 90 mol % and the molar proportion of the repeating units represented by formulae (I) to (II) is from 10/90 to 50/50.

Abstract: The present invention provides a liquid-crystalline polymer blend which is obtained by combining liquid-crystalline polymer (A) which has a modulus of elongation of 20-32 GPa and a melting point measured by differential scanning calorimeter of 250-330° C. and liquid-crystalline polymer (B) which has a melting point measured by differential scanning calorimeter of equal to or higher than 190° C. and lower than 250° C., wherein the weight ratio of said liquid-crystalline polymer (A) to said liquid-crystalline polymer (B) is in the range of from 50:50 to 90:10. The liquid-crystalline polymer blend and the liquid-crystalline polymer blend composition comprising the same exhibit good mechanical properties such as modulus of elongation and good molding processability at low temperatures. The liquid-crystalline polymer blend and the liquid-crystalline polymer blend composition of the present invention are suitable for producing welded articles with high joint strength.

Abstract: The present invention provides a liquid-crystalline polyester blend, which is obtained by combining a liquid-crystalline polyester (A) and a liquid-crystalline polyester (B) such that the ratio by weight of (A)/(B) is 99/1 to 80/20: liquid-crystalline polyester (A) which consists of aromatic oxycarbonyl repeating units, aromatic dioxy repeating units and aromatic dicarbonyl repeating units, and contains 40-80 mol % of the repeating unit represented by formula (I) based on the total repeating units constituting the liquid-crystalline polyester (A); liquid-crystalline polyester (B) which comprises repeating units represented by formulae (I) and (II), wherein the molar proportion of the total amount of the repeating units represented by formulae (I) and (II) based on the total amount of the repeating units constituting the liquid-crystalline polyester (B) is greater than or equal to 90 mol % and the molar proportion of the repeating units represented by formulae (I) to (II) is from 10/90 to 50/50.

Abstract: The present invention provides a wholly aromatic liquid-crystalline polyester consisting of the repeating units represented by formulae (I), (II), (III) and (IV): wherein: the molar proportion of the repeating unit represented by formula (I) based on the total repeating units constituting the wholly aromatic liquid-crystalline polyester is 40-80 mol %; the molar ratio of the total amount of the repeating units represented by formulae (II) and (III) to the repeating unit represented by formula (IV) is from 90/100 to 100/90; the molar proportion of the repeating unit represented by formula (II) based on the total amount of the repeating units represented by formulae (II) and (III) is 80-99.9 mol %; and the two “—O—” attached to the benzene ring in formula (III) are positioned meta or para to each other and “Ar” in formula (IV) represents a bivalent aromatic group.

Abstract: Provided is a liquid-crystalline polyester with good properties obtainable by subjecting a prepolymer consisting of the repeating units represented by formulae (I), (II), (III) and (IV): to heat treatment in a substantially solid state.

Abstract: The present invention provides a method for manufacturing a wholly aromatic liquid-crystalline polyester resin comprising the steps of: 1) acylating the hydroxy group of major monomer components selected from the group consisting of aromatic hydroxycarboxylic acid, aromatic diol and aromatic dicarboxylic acid, with an acylating agent, provided that said major monomer components comprise at least one of aromatic hydroxycarboxylic acid and aromatic diol; and 2) polycondensing said major monomer components of which hydroxy group is acylated, wherein, the polycondensation reaction is carried out in the presence of a metal dihydrogen phosphate in an amount of 1-5000 ppm based on the total monomer components, and a liquid-crystalline polyester resin manufactured by the method and a composition comprising said resin.

Abstract: The present invention provides a liquid-crystalline polyester obtainable by a method comprising the steps of: (1) preparing a prepolymer consisting of the repeating units represented by formulae (I), (II), (III) and (IV): wherein, p, q, r and s represent relative molar proportions (mol %) of the repeating units in the liquid-crystalline polyester resin and satisfy the following formulae: 60?p?80, 10?r?20, 10?q+s?20, 0.05?s/(q+s)?0.3, p+q+r+s=100; and (2) heating the prepolymer in substantially solid state at 250-350° C., provided that the liquid crystalline polyester has a deflection temperature under load of 280-340° C., and a melt viscosity of 10-60 Pa·s.

Abstract: The present invention provides a liquid-crystalline polymer blend which is obtained by combining liquid-crystalline polymer (A) which has a modulus of elongation of 20-32 GPa and a melting point measured by differential scanning calorimeter of 250-330° C. and liquid-crystalline polymer (B) which has a melting point measured by differential scanning calorimeter of equal to or higher than 190° C. and lower than 250° C., wherein the weight ratio of said liquid-crystalline polymer (A) to said liquid-crystalline polymer (B) is in the range of from 50:50 to 90:10. The liquid-crystalline polymer blend and the liquid-crystalline polymer blend composition comprising the same exhibit good mechanical properties such as modulus of elongation and good molding processability at low temperatures. The liquid-crystalline polymer blend and the liquid-crystalline polymer blend composition of the present invention are suitable for producing welded articles with high joint strength.

Abstract: A thermotropic liquid crystalline polymer, which is obtainable by copolymerizing a trifunctional hydroxynaphthalene carboxylic acid represented by the general formula (I) and/or reactive derivative thereof with other polymerizing monomer(s) wherein one of m and n is 1 and the other is 2, and a composition including the polymer are provided. The molded article obtained from the thermotropic liquid crystalline polymer or the composition has less anisotropy in mechanical strength and improved weld strength.

Abstract: The present invention provides a liquid-crystalline polyester resin, essentially consisting of the repeating units represented by formulae [I]-[IV]: wherein p, q, r and s satisfy the following formulae: 0.4?p/q?2.0, 2?r?15, 2?s?15, and p+q+r+s=100, provided that the liquid-crystalline polyester resin has a melting point of 190-250° C. determined by differential scanning calorimetry. The liquid-crystalline polyester resin of the present invention exhibits a good molding processability at low temperatures and excellent mechanical properties.

Abstract: The present invention provides a method for producing pellets or pellets of a liquid-crystalline polymer composition with a reduced amount of anionic impurities such as chloride, nitrate and sulfate ions. The present invention provides a method for producing pellets of a liquid-crystalline polymer, which comprises: providing a molten state liquid-crystalline polymer in a polycondensation reaction vessel, pulling out the liquid-crystalline polymer from a valve at the bottom of the reaction vessel through a die to give a strand of the polymer, cooling the strand on a water cooling conveyor positioned below the reaction vessel, and cutting the strand to give the pellets, wherein the cooling water for the strand is pure water whose electrical conductance is not more than 10 ?S/cm.

Abstract: Provided is a liquid-crystalline polyester with good properties obtainable by subjecting a prepolymer consisting of the repeating units represented by formulae to heat treatment in a substantially solid state.

Abstract: The present invention provides a method for manufacturing a wholly aromatic liquid-crystalline polyester resin comprising the steps of: 1) acylating the hydroxy group of major monomer components selected from the group consisting of aromatic hydroxycarboxylic acid, aromatic diol and aromatic dicarboxylic acid, with an acylating agent, provided that said major monomer components comprise at least one of aromatic hydroxycarboxylic acid and aromatic diol; and 2) polycondensing said major monomer components of which hydroxy group is acylated, wherein, the polycondensation reaction is carried out in the presence of a metal dihydrogen phosphate in an amount of 1-5000 ppm based on the total monomer components, and a liquid-crystalline polyester resin manufactured by the method and a composition comprising said resin.

Abstract: The present invention provides a liquid-crystalline polyester obtainable by a method comprising the steps of; preparing a prepolymer consisting of the repeating units represented by formulae (I), (II), (III) and (IV): wherein, p, q, r and s represent relative molar proportions (mol %) of the repeating units in the liquid-crystalline polyester resin and satisfy the following formulae: 60?p?80, 10?r?20, 10?q+s?20, 0.05?s/(q+s)?0.3 p+q+r+s=100; and heating the prepolymer in substantially solid state at 250-350° C., provided that the liquid crystalline polyester has a deflection temperature under load of 280-340° C., and a melt viscosity of 10-60 Pa·s.

Abstract: A thermotropic liquid crystalline polymer, which is obtainable by copolymerizing a trifunctional hydroxynaphthalene carboxylic acid represented by the general formula (I) and/or reactive derivative thereof with other polymerizing monomer(s) 1

Abstract: Provided is a liquid crystalline polymer which is obtained by copolymerizing at least one polyfunctional aromatic monomer selected from the group consisting of the compounds represented by the formulae (I), (II) and (III) below with at least one polymerizable monomer. The liquid crystalline polymer of the present invention is excellent in heat resistance, molding properties, flow properties and mechanical properties, especially it provide molded article with improved weld strength.