Liquid-crystalline polyester blend

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);
• wherein the aromatic oxycarbonyl repeating unit contained in the liquid crystalline polyester (A) is solely the unit represented by formula (I),
• 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 equal to 100 mol % and the molar proportion of the repeating units represented by formulae (I) to (II) is from 10/90 to 50/50,
• wherein the deflection temperature under load of the liquid-crystalline polyester blend is 250-310° C., and
• wherein the dielectric loss tangent of the liquid-crystalline blend measured at a frequency of 1 GHz using a stick-shaped test piece with a length of 85 mm, width of 1.75 mm and thickness of 1.75 mm is less than or equal to 0.001: