Sumitomo Chemical Company, Limited

Toyonari Ito

Satoshi Okamoto

Changbo Shim

Shinji Ohtomo

Tomoya Hosoda

Takayuki Sugiyama

Shohei Azami

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

ABSTRACT OF THE DISCLOSURE An aromatic polyester containing a repeating unit (A) having Formula (a) below; a repeating unit (B) derived from an aromatic dicarboxylic acid, such as terephalic acid; a repeating unit (C) derived from an aromatic amine optionally having a hydroxyl group; and a repeating unit (D) derived from an aromatic diol. The content of (A) is 10 mol % to &#x3c;20 mol %, the content of (B) is 40 mol % to &#x3c;45 mol %, the total content of (C) and (D) is 40 mol % to &#x3c;45 mol %, and the content of (D) is &#x3e;0 mol % and &#x3c;15 mol % with respect to a total of (A) to (D). In the Formula (a), Aris a 1,4-phenylene group, a 2,6-naphthylene group, or a 4,4'-biphenylene group; and at least one hydrogen atom in AO may be each substituted with a halogen atom, an alkyl group, or an aryl group.&#x2014;O&#x2014;Ar&#x2014;CO&#x2014;&#x2003;&#x2003;(a)

Aromatic polyester, liquid aromatic-polyester composition, process for producing aromatic-polyester film, and aromatic-polyester film

An object of the present invention is to provide a liquid crystal polyester-containing liquid composition which is capable of producing a prepreg and a resin film in which surface defects are remarkably reduced even in case of drying at high temperature to remove the solvent in the production process. Disclosed Are a liquid crystal polyester-containing liquid composition comprising a liquid crystal polyester, an organic solvent, and one or more kinds of selected leveling agents, wherein the content of the leveling agent is from 0.001 to 2.0 parts by mass based on 100 parts by mass of the total amount of the liquid crystal polyester and the organic solvent; and a method for producing a resin film, which comprises applying the above-described liquid crystal polyester-containing liquid composition on a support, and then removing the solvent from the liquid crystal polyester-containing liquid composition on the support at 50&#xb0; C. or higher.

Liquid crystal polyester-containing liquid composition

A method for producing a laminated base material includes applying a liquid composition containing a solvent and a liquid crystal polyester to a substrate; and forming a covering material by removing the solvent. The substrate includes a conductor forming a circuit pattern on an insulating layer. The liquid composition covers the conductor. The polyester includes 30-50 mol % of (1), 25-35 mol % of (2), and 25-35 mol % of (3):-0-Ar-00-&#x2003;&#x2003;(1)&#x2014;CO&#x2014;Ar-00-&#x2003;&#x2003;(2)&#x2014;X&#x2014;Ar&#x2014;Y&#x2014;&#x2003;&#x2003;(3)

Method for producing laminated base material

The present invention provides a laminate comprising a resin layer and a copper foil. The resin layer is made from a liquid crystalline polyester having at least one structural unit selected from a structural unit derived from aromatic diamine and a structural unit derived from aromatic amine with a phenolic hydroxyl group in an amount of 10 to 35% by mole on the basis of the total structural units in the polyester. The copper foil has a tensile modulus of 60 GPa or smaller and a tensile strength at break of 150 MPa or smaller measured after heat treatment at a temperature of 300&#xb0; C. The copper-foil laminate has good flexibility and high durability with little anisotropy is provided.

Laminate of liquid crystalline polyester with copper foil

The present invention provides a liquid crystalline polyester comprising (a) a repeating unit derived from aromatic hydroxycarboxylic acid, (b) a repeating unit derived from aromatic dicarboxylic acid and (c) a repeating unit represented by &#x2014;X&#x2014;Ar1-O&#x2014;Ar1-Y&#x2014;, wherein Ar1 represents 1,4-phenylene which may be substituted by a halogen atom, an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 20 carbon atoms, and X and Y independently represent O or NH. The polyester in the preset invention has a sufficiently low dielectric constant and/or is a sufficiently high resistance in hydrolysis.

Liquid crystalline polyester and film using the same

A film comprising a resin alloy of a liquid-crystalline polyester, a polyimide and an optional inorganic filler is provided. The film is excellent in heat resistance and dimensional stability.

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Tsukuba, Japan

Toyonari Ito