Sumitomo Chemical Company, Limited

Nozomi Masui

Shinji Ohtomo

Shohei Azami

Monami Tosa

Noriyuki Hida

Hidenobu Kakimoto

Tomoya Nakatani

Junichi Ikeuchi

Yasutaka Yatsumonji

Katsunori Mochizuki

Koji Miyamoto

Hiroko Sugiyama

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.

An object of the present invention is to provide a polyamideimide resin for an optical member having both high flexibility and bending resistance, and in particular, a polyamideimide resin for a front plate of an image display apparatus, and an optical member such as a front plate containing the polyamideimide resin. A polyamideimide resin having constitutional units represented by formula (1) and formula (2): in formula (1) and formula (2), X and Z each independently represent a divalent organic group,Y represents a tetravalent organic group, andat least a part of Z is constitutional unit represented by formula (3): in formula (3), Rto Reach independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms, and the hydrogen atoms contained in Rto Rmay be each independently substituted with a halogen atom,A represents &#x2014;O&#x2014;, &#x2014;S&#x2014;, &#x2014;CO&#x2014; or &#x2014;NR&#x2014;, and Rrepresents a hydrocarbon group having 1 to 12 carbon atoms which may be substituted with a halogen atom,m is an integer of 1 to 4, and* represents a bonding hand.

Polyamideimide resin and optical member including polyamideimide resin

A polymer compound comprising a constitutional unit represented by the following formula (1) and a constitutional unit represented by the following formula (X) and/or a constitutional unit represented by the following formula (Y), [wherein, aand aeach independently represent an integer of 0 or more. Arand Areach independently represent an arylene group or a divalent heterocyclic group and these groups each optionally have a substituent. Arand Areach independently represent an arylene group, a divalent heterocyclic group or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are bonded directly to each other, and these groups each optionally have a substituent. When there are a plurality of Arand a plurality of Ar, each of them may be the same or different. R, Rand Reach independently represent an alkyl group, an aryl group or a monovalent heterocyclic group and these groups each optionally have a substituent. When there are a plurality of Rand a plurality of R, each of them may be the same or different.]Ar&#x2003;&#x2003;(Y)[wherein, Arrepresents an arylene group, a divalent heterocyclic group or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are bonded directly to each other, and these groups each optionally have a substituent.].

Polymer compound and light emitting device using the same

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Tsukuba, Japan

Nozomi Masui