摘要:
A liquid crystal polyester resin composition of the present invention comprises: 100 parts by mass of a liquid crystal polyester; and 50 to 150 parts by mass of titanium oxide, wherein the liquid crystal polyester comprises 2 to 30 mole % of a repeating structural unit represented by the following formula (1), and 40 to 80 mole % of a repeating structural unit represented by the following formula (2).
摘要:
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.
摘要:
The fully-aromatic thermotropic liquid crystal polyester resin composition of the present invention comprises 100 parts by mass of a fully-aromatic thermotropic liquid crystal polyester; and 50 to 150 parts by mass of titanium oxide, wherein the fully-aromatic thermotropic liquid crystal polyester comprises a repeating structural unit represented by the following formula (1), a repeating structural unit represented by the following formula (2), and a repeating structural unit represented by the following formula (3), and comprises 65 mole % to 78 mole % of the repeating structural unit represented by the formula (1). wherein X and Y each represent a divalent group having an aromatic ring.
摘要:
A method for producing a liquid crystal polyester according to the present invention is a method for producing a liquid crystal polyester, comprising subjecting a composition in which a dicarboxylic acid compound, a hydroxycarboxylic acid compound, and a dihydroxy compound are contained to melt polycondensation, and subjecting an obtained reaction product to solid phase polycondensation, wherein the composition contains, based on a total of the dicarboxylic acid compound, the hydroxycarboxylic acid compound, and the dihydroxy compound, 2 to 30 mole % of a dicarboxylic acid compound represented by the following formula (1), and 40 to 80 mole % of p-hydroxybenzoic acid, a polycondensation temperature of the above melt polycondensation is 315° C. or less, and a polycondensation temperature of the above solid phase polycondensation is 315° C. or less.
摘要:
A resin composition for surface-mountable (SMT) camera modules which is excellent in the balance between heat resistance, rigidity, strength or moldability and surface exfoliation characteristics is provided by using a liquid-crystal polyester resin composition which comprises 100 parts by mass of a liquid-crystal polyester, 15 to 60 parts by mass of talc having a number-mean particle diameter of 10 to 50 μm, 25 to 50 parts by mass of glass fiber having a number-mean fiber length of 100 to 200 μm, 6 to 20 parts by mass of titanium oxide, and 2 to 10 parts by mass of carbon black and which exhibits a melt viscosity of 10 to 100 Pa S as determined at a shear rate of 100 sec−1 and 370° C. and a deflection temperature under load of 220° C. or above.
摘要:
A resin composition for surface-mountable (SMT) camera modules which is excellent in the balance between heat resistance, rigidity, strength or moldability and surface exfoliation characteristics is provided by using a liquid-crystal polyester resin composition which comprises 100 parts by mass of a liquid-crystal polyester, 15 to 60 parts by mass of talc having a number-mean particle diameter of 10 to 50 μm, 25 to 50 parts by mass of glass fiber having a number-mean fiber length of 100 to 200 μm, 6 to 20 parts by mass of titanium oxide, and 2 to 10 parts by mass of carbon black and which exhibits a melt viscosity of 10 to 100 Pa S as determined at a shear rate of 100 sec−1 and 370° C. and a deflection temperature under load of 220° C. or above.
摘要:
A wholly aromatic polyester having excellent moldability, heat resistance and blistering resistance and a composition thereof are obtained from an aromatic polyester composed of six specified types of structural unit and having an optical melt anisotropy. The composition can provide electronic heater parts and oven-ware both excellent in mechanical strength, heat resistance, moldability and microwave oven resistance, and various other heat-resistant members. Molded articles made from this composition can be coated with fluorocarbon resin without the necessity for pretreatment such as heat treatment.
摘要:
A liquid crystal polyester resin composition of the present invention comprises: 100 parts by mass of a liquid crystal polyester; and 50 to 150 parts by mass of titanium oxide, wherein the liquid crystal polyester comprises 2 to 30 mole % of a repeating structural unit represented by the following formula (1), and 40 to 80 mole % of a repeating structural unit represented by the following formula (2).
摘要:
A liquid crystal polyester resin composition includes, based on 100 parts by mass of a liquid crystal polyester, 15 to 60 parts by mass of talc having a number average particle size of 10 to 50 μm, 25 to 50 parts by mass of a glass fiber having a number average fiber length of 100 to 200 μm and a number average fiber diameter of 4 to 8 μm, and 2 to 10 parts by mass of carbon black, wherein a melt viscosity as determined at a shear rate of 100 sec−1 at 370° C. is 10 to 100 Pa·S and a deflection temperature under load is 220° C. or more. The liquid crystal polyester resin composition is used to provide a liquid crystal polyester resin composition for a camera module, having good heat resistance, rigidity, strength, and moldability, and also an excellent surface exfoliation property in a well balanced manner and being capable of being surface mounted (SMT).
摘要:
A wholly aromatic liquid crystal polyester resin composition for injection molding, formed by melt-kneading 100 parts by mass of a wholly aromatic liquid crystal polyester resin, and 5 to 20 parts by mass of glass fibers having a number average diameter of 5 to 20 μm and an aspect ratio of 5 or more, the wholly aromatic liquid crystal polyester resin being formed by polycondensation of 60 to 70 mol % of p-hydroxybenzoic acid, 40 to 30 mol % of terephthalic acid and 4,4′-dihydroxydiphenyl combined, and 0 to 5 mol % of isophthalic acid and/or terephthalic acid (for all of these, derivatives thereof are included, and the total of these is 100 mol %). This composition has excellent damping properties, and is suitable for a molding material of an optical pickup lens holder for short type pickups for use in high-speed DVD systems and playback pickups for use in Blu-ray systems.