| 摘要 |
<p>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 0.1 - 2 molar parts of one or two repeating units that come from corresponding minor copolymerizing components,
wherein the major repeating units are selected from the group consisting of aromatic oxycarbonyl repeating unit, aromatic dioxy repeating unit and aromatic dicarbonyl repeating unit, wherein 40 - 8C mol% of the major repeating units are the unit represented by formula (I); and the amounts of the aromatic dioxy repeating unit and the aromatic dicarbonyl repeating unit in the major repeating units are equimolar; and
LCP B is selected from the group consisting of liquid-crystalline polyester (b-1) (LCP b-1) and liquid-crystalline polyester (b-2) (LCP b-2), each consisting of 100 molar parts of major repeating units and optionally 0.1 - 2 molar parts of one or two repeating units that come from corresponding minor copolymerizing components;
wherein the major repeating units of LCP b-1 are aromatic oxycarbonyl repeating units; and
the major repeating units of LCP b-2 are selected from the group consisting of aromatic oxycarbonyl repeating unit, aromatic dioxy repeating unit and aromatic dicarbonyl repeating unit, wherein the amounts of aromatic dioxy repeating unit and aromatic dicarbonyl repeating unit in the major repeating units are equimolar,
wherein greater than or equal to 90 mol% of the major repeating units of LCP b-1 and LCP b-2 each are repeating units represented by formulae (I) and (II), and the molar proportion of the repeating units represented by formulae (I) to (II) is from 10/90 to 50/50;
provided that at least one of LCP A and LCP B comprises one or two repeating units that come from corresponding minor copolymerizing components selected from the group consisting of aromatic diol, aromatic dicarboxylic acid, aromatic monocarboxylic acid and aromatic monohydroxy compound The liquid-crystalline polyester blend composition of the present invention exhibits excellent dielectric properties as well as good mechanical properties and thermal properties.</p> |
