摘要:
A liquid-crystalline polyester for film having small linear expansibility and high flexibility is provided. The polyester may have structural units —O—Ar1-CO—, —NH—Ar2-X—, —CO—Ar3-CO— and —CO—Ar4-Z-Ar5-CO— wherein Ar1 represents 1,4-phenylene, 2,6-naphthylene or 4,4′-biphenylene, Ar2 represents 1,4-phenylene or 1,3-phenylene, X represents —O— or —NH—, Ar3 represents 1,4-phenylene, 1,3-phenylene or 2,6-naphthylene, Ar4 and Ar5 independently represent 1,4-phenylene, 2,6-naphthylene or 4,4′-biphenylene, and Z represents —O—, —SO2— or —CO—, in which the amount of monomer (1) is 30-80% by mol, the amount of monomer (2) is 10-35% by mol, the total amount of monomers (3) and (4) is 10-35% by mol and the amount of monomer (4) is 1% by mol or larger.
摘要:
A network apparatus that sends sound data to another network apparatus connected over a network is disclosed. The network apparatus includes: a destination selecting part configured to select a predetermined number of network apparatuses as a destination network apparatus from network apparatuses connected to the network; and a sound data sending part configured to broadcast sound data to the predetermined number of the network apparatuses selected in the destination selecting part.
摘要:
The present invention provides a method for producing a liquid crystalline polyester fiber, the method comprising the steps of discharging an electrically charged solution comprising a liquid crystalline polyester, a fiber-forming polymer and a solvent from a container; and drawing the charged solution by electrical attraction in an electrical field generated between the solution and an electrically charged collecting means having the opposite charge of the solution, while evaporating at least a portion of the solvent to form a liquid crystalline polyester fiber. The fiber obtained in the present invention has a small average fiber diameter and can be made into a thin fiber cloth with high density.
摘要:
An object of the present invention is to provide a resin composition which is capable of manufacturing a high dielectric resin film having high dielectric constant and small dielectric loss tangent. And the present invention provides high dielectric resin composition comprising: a high dielectric filler; and resin; wherein a relative dielectric constant of the high dielectric filler satisfies the following formulae (1) and (2). [(∈T−∈25)/∈25]MAX≦0.03 (1) 40≦∈25≦1000 (2)
摘要:
A resin-impregnated substrate having a high heat resistance at a high temperature under soldering conditions and a small linear expansion rate is provided. The resin-impregnated substrate can be obtained by a method comprising the steps of immersing a sheet comprising an aromatic liquid-crystalline polyester fiber in an aromatic liquid-crystalline polyester solution containing an aprotonic solvent and a liquid-crystalline polyester comprising 10 to 35% by mol, with respect to the total repeating units of the polyester, of at least one repeating unit selected from the group consisting of a repeating unit derived from an aromatic diamine and a repeating unit derived from an aromatic amine with a phenolic hydroxyl group; and removing the solvent.
摘要:
The present invention provides a substrate for flexible wiring comprises a liquid crystalline polyester layer and a copper foil with a thickness of 5 μm or less. The substrate has a large adhesion between the resin layer and the copper foil, and is sufficient in water absorbing property and electrical properties.
摘要:
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.
摘要:
The present invention provides a piezoelectric substance of single crystal or uniaxial crystal type in which three lattice lengths a, b and c of a unit lattice of the piezoelectric substance are smaller than lattice length a0, b0 and c0 of a unit lattice of a bulk state of single crystal having the same temperature and same composition, respectively, and a volume of the unit lattice of the piezoelectric substance is smaller than a volume of the unit lattice of the bulk state of single crystal having the same temperature and same composition.
摘要:
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° C. The copper-foil laminate has good flexibility and high durability with little anisotropy is provided.
摘要:
An aromatic liquid-crystalline polyester composition is provided, which comprises at least one compound selected from an aliphatic carboxylate aryl ester and an aromatic carboxylic anhydride; an aromatic liquid-crystalline polyester; and a solvent containing at least 30% by weight of a halogen-substituted phenol compound. Using the composition, an aromatic liquid-crystalline polyester film with a low viscosity in melting state can be obtained.