Abstract: Disclosed is a flame-retardant liquid crystal polyester composition, which comprises (A) 100 wt. parts of a liquid crystal polyester comprising structural units of the following formulae (I), (II), (III) and (IV), in which the amount of units (I) and (II) is 77 to 95 mole% based on the sum of units (I), (II) and (III), the amount of units (III) is 23 to 5 mole% based on the sum of units (I), (II) and (III), and the units (I)/units (II) molar ratio is 75/25-95/5 and (B) 0.5 to 30 wt. parts of a polymeric flame retardant having an average dispersed particle diameter not larger than 2.5 .mu.m: ##STR1## wherein R.sub.1 and R.sub.2 are specific aromatic residues. This composition gives a molded article having a superior flame retardancy, heat resistance, mechanical properties, and appearance.

Abstract: A high modulus polyester molded article is obtained by molding an aromatic polyester which comprises at least one structural unit selected from the following structural units (I) to (III), the structural units (II)+(III) being less than 10 mol % of the structural units (I)+(II)+(III), and which is capable of forming anisotropic melt: ##STR1## wherein X represents at least one group selected from ##STR2## Y represents at least one group selected from ##STR3## and Z represents at least one group selected from ##STR4##

Abstract: A multi-layer molded article having good interlayer adhesion and exhibiting igh modulus even when its thickness is large, which comprises at least one layer formed by an anisotropic melt-forming polyester having structural units selected from the following structural units (I) to (III), the molar ratio of (I)/[(I)+(II)+(III)] being in the range of 20 to 100 mol %: ##STR1## wherein X represents at least one group selected from ##STR2## Y represents at least one group selected from ##STR3## and Z represents at least one group selected from ##STR4##

Abstract: A polyester composition according to the subject invention is composed of thermoplastic polyesters and the titanium dioxide and/or aluminum oxide having specific particle diameters.The polyester composition provides the molded articles which display reduced warpage.The polyester composition has high plating characteristic and provide superior metal-plated moldings.

Abstract: An aromatic polyester comprising the following structural units [(I)+(II)], (I)+(II)+(III)], [(I)+(II)+(IV)], [(I)+(III)+(IV)], or [(I)+(II)+(III)+(IV)], the unit (I) occupying 20-85 mol % of all structural units, and a shaped article of a high elastic modulus obtained from the polyester: ##STR1## wherein R.sub.1 represents one or more groups selected from ##STR2## and R.sub.

Abstract: A high modulus polyester comprising the following structural units (I) anr (II) and (III), the structural units (I) and (II) occupying 51-99 mol % of the whole and the structural unit (III) occupying 49-1 mol % of the whole, and a high modulus shaped article obtained from the polyester: ##STR1## wherein R represents one or more divalent radicals selected from ##STR2## and X represents chlorine or bromine atom.

Abstract: A magnetic recording material which comprises a film of a polyester and a magnetic layer formed on at least one side of said film, said polyester containing more than 85 mol % of the repeating unit represented by the formula below and having an intrinsic viscosity of 0.3 to 1.4, and said film of said polyester having a refractive index ratio of 0.935 to 0.975 in the thickness direction and a density index of 0.02 to 0.08. ##STR1## (where X is a halogen atom selected from fluorine, chlorine, and bromine, or an alkyl group of carbon number 1 to 3; and l and m are an integer of 1 to 2, p is an integer of 2 to 6, and q is an integer of 2 to 4.)Although the magnetic recording material is extremely thin, it exhibits outstanding running performance and electromagnetic conversion characteristics. It makes it possible to miniaturize the magnetic tape cassette and extend the recording time. It is useful for long-time video tape and portable 8-mm video tape.

Abstract: A process for producing an .alpha.,.omega.-bis(2-chlorophenoxy)alkane-4,4'-dicarboxylic acid or its ester, that has a high Young's modulus and that is useful as a material for polyesters capable to form self-extinguishing fibers and films. Thus .alpha.,.omega.-bis(2-chlorophenoxy)alkane-4,4'-dicarboxylic acid or its ester is obtained by reacting .alpha.,.omega.-bis(phenoxy)alkane-4,4'-dicarboxylic acid or its ester with chlorine in the presence of a solvent selected from the group consisting of lower fatty acid having 2 to 6 carbon atoms, hydrocarbon chloride having 1 to 8 carbon atoms, and carbon chloride having 1 to 2 carbon atoms, in high yield.

Abstract: A flame retarding thermoplastic polyester composition superior in thermal stability, fluidity and mechanical properties, and prepared by mixing (a) halogen containing polystyrene and/or halogen containing poly-.alpha.-methylstyrene, (b) antimony trioxide and (c) epoxy compound with respect to thermoplastic polyester is disclosed.