Nippon Petrochemicals Company, Limited

Kuraray Co., Ltd.

Kurarav Co., Ltd.

Toshitaka Kobayashi

Takashi Inoue

Takuji Okaya

Satoshi Murouchi

Yoshikuni Yamada

Toshiyuki Akazawa

A method of producing a thermotropic liquid crystalline copolyester having an extremely small amount of out-gases comprising the steps of: (1) charging in a reactor 5-100 mol % of aromatic hydroxycarboxylic acid, 0-47.5 mol % of aromatic dicarboxylic acid and 0-47.5 mol % of aromatic diol, so that the sum of mol % of each material is 100 mol % and the molt of aromatic dicarboxylic acid and that of aromatic diol are substantially equal; (2) adding acetic anhydride of an amount which satisfies the formula, (B-C)/A&gE;1.04, &ldquo;A&rdquo; representing the total molar number of the hydroxy group in a reaction system, &ldquo;B&rdquo; representing the molar number of acetic anhydride to be added, and &ldquo;C&rdquo; representing the molar number of water present in the reaction system prior to addition of acetic anhydride; (3) acetylation; (4) melt polymerization; and (5) solid-phase polymerization.

Method of producing thermotropic liquid crystalline copolyester, thermotropic liquid crystalline copolyester composition obtained by the same method, and molding made of the same composition

A method of producing a thermotropic liquid crystalline copolyester having an extremely small amount of out-gases comprising the steps of: (1) charging in a reactor 5-100 mol % of aromatic hydroxycarboxylic acid, 0-47.5 mol % of aromatic dicarboxylic acid and 0-47.5 mol % of aromatic diol, so that the sum of mol % of each material is 100 mol % and the mol % of aromatic dicarboxylic acid and that of aromatic diol are substantially equal; (2) adding acetic anhydride of an amount which satisfies the formula, (B&minus;C)/A&gE;1.04, &ldquo;A&rdquo; representing the total molar number of the hydroxy group in a reaction system, &ldquo;B&rdquo; representing the molar number of acetic anhydride to be added, and &ldquo;C&rdquo; representing the molar number of water present in the reaction system prior to addition of acetic anhydride; (3) acetylation; (4) melt polymerization; and (5) solid-phase polymerization.

A thermotropic liquid crystal polyester and a sealing material used for electric and electronic parts prepared from the thermotropic liquid crystal polyester, which polyester can be molded at low temperatures, while which polyester has heat resistance capable of well withstanding the process such as soldering. The thermotropic liquid crystal polyester is characterized in that it contains five kinds of specified repeating structural units in the respective ratios and it meets specific conditions of an intrinsic viscosity or the temperature of complete melting and storage elastic modulus.

Wholly-aromatic thermotropic liquid crystal polyester and sealing

An adhesive resin composition useful for bonding a resin having gas barrier properties and a hydrophobic thermoplastic resin which comprises an ethylene-acrylate or methacrylate copolymer grafted with an ethylenic unsaturated carboxylic acid or its acid anhydride; and 0.02 to 0.6 equivalent to the ethylenic unsaturated carboxylic acid or its acid anhydride of a periodic table group Ia or IIa metal hydroxide, or said metal hydroxide and an ethylene-acrylate or methacrylate copolymer. A laminated material of a resin having gas barrier properties and a hydrophobic thermoplastic resin laminated with the adhesive resin composition and a resin composition comprising the adhesive resin composition, a resin having gas barrier properties and a hydrophobic thermoplastic resin are also disclosed.

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Funabashi, Japan

Toshitaka Kobayashi