Sumitomo Chemical Company, Limited

Monami Tosa

Shinji Ohtomo

Nozomi Masui

Shohei Azami

A liquid crystal polyester comprising a repeating unit derived from an aromatic hydroxycarboxylic acid. The content of the repeating unit derived from an aromatic hydroxycarboxylic acid is 80% or more based on 100% of a total number of all repeating units of the liquid crystal polyester. The repeating unit derived from an aromatic hydroxycarboxylic acid comprises a repeating unit (A1) represented by the formula (A1) and a repeating unit (A2) represented by the formula (A2). A ratio [repeating unit (A2)/repeating unit (A1)] is 1.2 or larger. A molar ratio [phenolic hydroxyl groups/(the phenolic hydroxyl groups+acyl groups)] is 0.3 or lower, as calculated byH-NMR.—O—Ar—CO—  (A1)—O—Ar—CO—  (A1)Arrepresents a phenylene group and Arrepresents a naphthylene group. A hydrogen atom is optionally substituted.

Liquid crystal polyester and film comprising the same

A liquid crystal polyester comprising a repeating unit (A1) represented by the formula (A1) and a repeating unit (A2) represented by the formula (A2). A molar ratio (phenolic hydroxyl groups derived from the repeating unit (A2)/phenolic hydroxyl groups derived from the repeating unit (A1)) is 1 or lower, as calculated byH-NMR. A ratio [repeating unit (A2)/repeating unit (A1)] is 1.2 or larger. The number of the repeating unit (A1) is 20% or more and the number of the repeating unit (A2) is 58% or more based on 100% of a total number of all repeating units of the liquid crystal polyester. A flow starting temperature of the liquid crystal polyester is 250° C. or more.—O—Ar—CO—  (A1)—O—Ar—CO—  (A2)Arrepresents a phenylene group and Arrepresents a naphthylene group. A hydrogen atom is optionally substituted.

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Ibaraki, Japan

Monami Tosa