| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a resin-impregnated sheet in which a dielectric loss tangent is small. <P>SOLUTION: The sheet is prepared by impregnating a fiber sheet with a liquid crystal polyester which has a repeating unit represented by formula (1), a repeating unit represented by formula (2), and a repeating unit represented by formula (3), in which a content of a repeating unit comprising a 2,6-naphthylene group is 40 mole% or more based on a total amount of all repeating units, as follows: (1)-O-Ar<SP POS="POST">1</SP>-CO-;(2)-CO-Ar<SP POS="POST">2</SP>-CO-;and (3)-O-Ar<SP POS="POST">3</SP>-O- wherein Ar<SP POS="POST">1</SP>represents a 2,6-naphthylene group, a 1,4-phenylene group, or a 4,4'-biphenylene group; Ar<SP POS="POST">2</SP>and Ar<SP POS="POST">3</SP>each independently represent a 2,6-naphthylene group, a 1,4-phenylene group, a 1,3-phenylene group, or a 4,4'-biphenylene group; and hydrogen atoms present in the group represented by Ar<SP POS="POST">1</SP>, Ar<SP POS="POST">2</SP>, or Ar<SP POS="POST">3</SP>may each independently be replaced by a halogen atom, an alkyl group, or an aryl group. <P>COPYRIGHT: (C)2012,JPO&INPIT |
