摘要:
The present invention provides a composition comprising a liquid crystal polyester, a white pigment and a glass fiber bundle obtained by bundling glass fibers using a sizing agent comprising a polyurethane having a polyester polyol unit and at least one of an aliphatic diisocyanate unit or an alicyclic diisocyanate unit, wherein the polyester polyol unit is a polyol unit having an aliphatic polyhydric alcohol unit and at least one of an aliphatic polybasic acid unit or an alicyclic polybasic acid unit. The liquid crystal polyester composition can provide a reflective plate having a high reflectivity.
摘要:
A resin composition for laser beam welding, including an aromatic polysulfone resin, a filler and a crystalline resin, wherein the weight ratio of the aromatic polysulfone resin to the filler being 20 to 99:80 to 1, the filler includes a glass fiber having a monofilament diameter of 10 to 50 μm, and the amount of the crystalline resin, relative to 100 parts by weight of the total of the aromatic polysulfone resin and the glass fiber being 0 to 10 parts by weight.
摘要:
The present invention provides a method for producing a resin composition comprising a thermoplastic resin and a filler, the method comprising providing an extrusion granulator that comprises (i) a cylinder provided with an outlet, a first feed port and a second feed port located downstream from the first feed port but upstream from the midpoint between the first feed port and the outlet and (ii) at least one screw mounted in the cylinder; feeding the thermoplastic resin and the filler into the cylinder wherein the thermoplastic resin is fed through the first feed port and at least part of the filler is fed through the second feed port; kneading the thermoplastic resin and the filler while transporting them towards the outlet to provide a mixture; and extruding the mixture to produce the composition.
摘要:
An aromatic polysulfone resin composition including an aromatic polysulfone resin and at least one compound selected from the group consisting of a monoacylglycerol, a diacylglycerol and a triacylglycerol, wherein the amount of the at least one compound, relative to 100 parts by weight of the aromatic polysulfone resin is preferably 0.02 to 4 parts by weight, and the aromatic polysulfone resin composition is preferably in the form of pellet obtained by subjecting the aromatic polysulfone resin and the at least one compound to melt-kneading.
摘要:
A method for manufacturing a liquid crystal polyester, comprising: a melt polycondensation step in which 0.001 to 1% by mass of a heterocyclic aromatic compound represented by the following formula (I) is added to a monomer mixture comprising at least one monomer selected from the group consisting of terephthalic acid, a terephthalic acid derivative, 2,6-naphthalenedicarboxylic acid and a 2,6-naphthalenedicarboxylic acid derivative, relative to 100% by mass of the monomer mixture, and then a melt polycondensation is conducted at a temperature of 240 to 300° C. so as to obtain a polymer. (wherein each of X1 and X2 independently represents a methyl group, an ethyl group, a propyl group, a butyl group or a pentyl group, provided that one or more hydrogen atoms on a heterocyclic aromatic ring may each independently be replaced by a halogen atom, an alkyl group or an aryl group).
摘要:
The present invention provides a method for producing a liquid crystalline polyester, the method comprising the steps of reacting monomers to obtain a polycondensate corresponding thereto, granulating the polycondensate to obtain a granule, and subjecting the granule to solid-phase polymerization to obtain a liquid crystalline polyester, wherein the content of iron in the granule to be subjected to the step (C) is 5 ppm by weight or less. According to the present invention, a liquid crystalline polyester having high whiteness and excellent heat resistance can be produced with satisfactory operability.
摘要:
The present invention provides a method for producing a liquid-crystalline polyester resin composition, the method comprising providing a twin-screw extrusion granulator that comprises a cylinder provided with at least one supply port and two screws installed in the cylinder; supplying (A) a liquid-crystalline polyester and (B) a titanium oxide filler into the cylinder through one of the at least one supply port; and melt-kneading the components (A) and (B), wherein a cylinder setting temperature is set at a temperature of (Tm−10)° C. or lower wherein Tm is a fluidization temperature of the component (A).
摘要:
The present invention provides a reflection plate made of a resin composition comprising a liquid crystalline polyester, a titanium oxide filler and a silica-based filler containing 85% by weight or more of silicon oxide, wherein the resin composition contains the titanium oxide filler in the amount of from 5 to 80 parts by weight and the silica-based filler in the amount of from 0.01 to 20 parts by weight on the basis of 100 parts by weight of the liquid crystalline polyester. The reflection plate has an excellent reflectance, especially to light in a visible range, while maintaining excellent heat resistance of the liquid crystalline polyester.