| 摘要 |
PROBLEM TO BE SOLVED: To improve light resistance in a thin wall part in a light-resistant member having the thin wall part and to enhance long-term reliability. SOLUTION: Liquid crystalline polyester in the thin wall part includes structural units represented by the following formula (1), (2), and (3). Assuming that the total of bivalent aromatic groups Ar<SP>1</SP>, Ar<SP>2</SP>, and Ar<SP>3</SP>included in formula (1), (2), and (3) is 100 mol%, 25 mol% or more of 2, 6-naphthalenediyl group is included. The flow start temperature is 280°C or higher. The formulae are as follows: (1)-O-Ar<SP>1</SP>-CO-, (2)-CO-Ar<SP>2</SP>-CO-, and (3)-O-Ar<SP>3</SP>-O-, wherein Ar<SP>1</SP>represents one or more groups selected from the group consisting of 2, 6-naphthalenediyl group, 1, 4-phenylene group, and 4, 4'-biphenylene group; and Ar<SP>2</SP>and Ar<SP>3</SP>each independently represents one or more groups selected from the group consisting of 2, 6-naphthalenediyl group, 1, 4-phenylene group, 1, 3-phenylene group, and 4, 4'-biphenylene group. COPYRIGHT: (C)2011,JPO&INPIT
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