Sumitomo Chemical Company, Limited

Shohei Azami

Shinji Ohtomo

Nozomi Masui

Monami Tosa

Masanobu Matsubara

Toyonari Ito

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.

Provided is a film including a thermoplastic resin, in which a relative permittivity of the film at a frequency of 1 GHz is 3 or less, a dielectric loss tangent of the film at a frequency of 1 GHz is 0.005 or less, and a molecular orientation (MOR) value of the film, which is measured by a microwave orientation meter, is in a range of 1 to 1.1.

Film and laminate

The present invention relates to a laminate film including a resin layer having a thickness of from 10 &#x3bc;m to 125 &#x3bc;m; and a toner layer formed on one surface of the resin layer, in which the resin layer is formed from a resin material having a glass transition temperature of 130&#xb0; C. or higher, the toner layer has a plurality of voids, and when a value defined by the following formula (S1) using the void area ratio, which represents the ratio of the area of exposed voids, for the respective faces of the surface of the toner layer and a cross section of the toner layer, is designated as porosity, and when two void area ratios respectively corresponding to the cross sections of the toner layer in two orthogonally intersecting directions are used as the void area ratios of the cross sections of the toner layer, the porosities respectively calculated according to the two void area ratios are both from 0.01% to 0.40%. 

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Tsukuba, Japan

Shohei Azami