Toray Industries, Inc.

Kohei Miyamoto

Hideyuki Umetsu

Mitsushige Hamaguchi

Makito Yokoe

Yusuke Tojo

Kosuke Shirotani

Yasuo Maeda

Junki Tanabe

A thermoplastic polyester resin includes a residue of an aromatic dicarboxylic acid or an ester-forming derivative thereof and a residue of a diol or an ester-forming derivative thereof, as main structural units, wherein the thermoplastic polyester resin has a hydroxy group concentration of 0.050 mmol/g or less. The use of such a thermoplastic polyester resin enables production of a molded article having excellent mechanical properties and heat resistance, and a reduced dielectric loss tangent at a high frequency of 1 GHz or more.

Thermoplastic polyester resin, thermoplastic polyester resin composition and molded article

Provided is a thermoplastic polyester resin composition comprising 100 parts by weight of (A) a non-liquid crystal thermoplastic polyester resin, 45 to 150 parts by weight of (B) a thermoplastic resin that is different from the non-liquid crystal thermoplastic polyester resin and has a dielectric loss tangent of not more than 0.005 when measured at a frequency of 5.8 GHz by the cavity resonance perturbation method, 2 to 20 parts by weight of (C) a compatibilizer having at least one reactive functional group selected from epoxy, acid anhydride, oxazoline, isocyanate, and carbodiimide groups, and 0.2 to 5 parts by weight of (D) at least one compound selected from tertiary amines, amidine compounds, organic phosphines and salts thereof, imidazoles, and boron compounds, wherein the ratio of the sum of the thermoplastic resin (B) and the compatibilizer (C) is in the range of 50 to 150 parts by weight and the weight ratio (B)/(C) of the thermoplastic resin (B) to the compatibilizer (C) is in the range of 8 to 50. The thermoplastic polyester resin composition can be molded into an article with low dielectric properties, excellent mechanical properties, and high bondability to metals.

Thermoplastic polyester resin composition and molded article

A thermoplastic resin composition includes 100 parts by weight of a thermoplastic resin (a) that is a liquid crystalline polyester and/or a polyphenylene sulfide; and 0.001 to 10 parts by weight of a metal complex (b) having a monodentate or a bidentate ligand; and at least one metal and/or its salt selected from the group consisting of copper, zinc, nickel, manganese, cobalt, chromium and tin.

Thermoplastic resin composition and its molded product

A liquid crystalline polyester having structural units (I), (II), (III), (IV) and (V), wherein 

Liquid crystalline polyester and production method of the same

A wholly aromatic liquid crystalline polyester contains 2.0 to 15.0 mole percent of a hydroquinone-derived structural unit relative to a total amount of structural units. The wholly aromatic liquid crystalline polyester has sum of an amount (a) of terminal hydroxyl group and an amount (b) of terminal acetyl group in a range of 50 to 350 equivalents/(g&#xb7;10), and has a ratio [(a)+(b)]/(c) of the sum of the amount (a) of terminal hydroxyl group and the amount (b) of terminal acetyl group to an amount (c) of terminal carboxyl group in a range of 1.05 to 2.00.

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Nagoya, Japan

Kohei Miyamoto