Abstract: There is disclosed a method of bonding a molded article to at least one member selected from a group consisting of an epoxy resin, a silicone resin, a urethane resin, a paint, a pressure-sensitive adhesive and an enzyme. The method comprises providing a molded article made by the molding of a resin composition containing not less than 5 wt. % of a styrene polymer having highly a syndiotactic structure, subjecting the molded article to a surface treatment by ultraviolet irradiation; and bonding the surface-treated molded article to at least one member listed above.

Abstract: Provided is a polyarylene sulfide resin composition having well-balanced fluidity and mechanical strength. The composition is such that its spiral flow length, x (mm), to give a molding having a thickness of 1 mm and the flexural strength, y (MPa), of the molding satisfy the following numerical formula (I), and comprises (A) from 50 to 70 parts by weight of a polyarylene sulfide resin, (B) from 30 to 50 parts by weight of glass fibers and (C) from 0 to 3 parts by weight, relative to 100 parts by weight of the polyarylene sulfide resin (A), of a coupling agent. y≧−(3x/10)+340  (I) wherein x falls between 100 and 300.

Abstract: A fiber-reinforced lightweight resin molded article with pores has a portion having a porosity lower than that of other general portions. Such a low-porosity portion serves as a rib in the resultant molded articles, to thereby enables to provide a fiber-reinforced lightweight resin molded article having excellent rigidity, bending strength, impact strength, uniformity of strength, resistance to local stress and torsion. The present invention also provides an efficient method for manufacturing the fiber-reinforced lightweight resin molded article.

Abstract: A process for producing a styrenic copolymer having a functional group and a syndiotactic configuration is provided. The process comprises bringing a metal compound into interaction with a vinyl compound having a functional group to mask the functional group and copolymerizing the vinyl compound having the masked functional group with a styrenic compound in the presence of a polymerization catalyst comprising (A) a transition metal compound, (B) at least one compound selected from compounds having oxygen and compounds which can form ionic complex compounds by reaction with the transition metal compound and (C) an organometallic compound. A styrenic copolymer which is a random, block or graft copolymer, preferably a random copolymer, of a vinyl compound having a functional group and a styrenic compound and has the repeating units derived from the styrenic compound having the syndiotactic configuration can be produced efficiently.

Abstract: There is herein disclosed a multi-layer structure which can suitably be used to manufacture a container in which sealing properties are improved for the prevention of container breakage during sterilization by heating, cooking by heating, distribution or the like and heat resistance is improved for the prevention of container deterioration and which is excellent in opening properties; and a container having the above-mentioned excellent characteristics which comprises this multi-layer structure.

Abstract: Provided is a polyarylene sulfide resin composition for sealing electronic parts, which comprises (A) from 20 to 35% by weight of a polyarylene sulfide resin, (B) from 60 to 75% by weight of silica, and (C) from 1 to 10% by weight of an elastomer, and contains (D) from 0.05 to 1.2 parts by weight of an epoxysilane and/or (E) from 0.1 to 3 parts by weight of an epoxy resin, both relative to 100 parts by weight of the total amount of the components (A), (B) and (C). The composition has good PCT and TCT acceptable quality and good fluidity, naturally having good properties intrinsic to ordinary PAS resin, and which, when used for sealing electronic parts, causes neither deformation of bonding wires and other elements nor package breakdown, and is therefore favorable to materials for sealing electronic parts.

Abstract: The invention relates to a polycarbonate resin composition having good durability even in high-moisture atmospheres, and to a flame-retardant polycarbonate resin composition in which the flame retardants adheres little to molds while the resin composition is molded. The polycarbonate resin composition comprises (A) a polycarbonate resin and (B) an inorganic filler, and contains (C) an arylphosphine and optionally (D) a flame retardant.

Abstract: The invention relates to an inexpensive and simple method for producing a starting material for polycarbonate resin and for producing polycarbonate resin. In the method for producing a starting material for polycarbonate resin production through interfacial polymerization, (I) a molten bisphenol compound is mixed and dissolved in an aqueous alkali solution at 20 to 80° C., or (II) it is, without being solidified, directly mixed with water to be in liquid at a temperature not higher than the melting point of the bisphenol compound, and then dissolved in an aqueous alkali solution.

Abstract: Provided are an aromatic polycarbonate copolymer and a method for producing it. An aromatic dihydroxy compound, at least one member selected from the group consisting of polyorganosiloxanes and aliphatic polyalcohols, and a dicarbonate are prepolymerized under heat to give a polycarbonate prepolymer, and the prepolymer is polymerized in a solid or swollen solid phase in the presence of a quaternary phosphonium salt serving as a catalyst to give an aromatic polycarbonate copolymer. The remaining monomer content, the acetone soluble content (that is, the low-molecular-weight substance content) and the cyclic oligomer content of the copolymer are all reduced, and the terminal hydroxyl fraction thereof is also reduced.

Abstract: Disclosed is a resin composition containing the following components (A), and (B) or optionally, (C), (D), and (E): (A) an atactic polystyrene or a mixture of an atactic polystyrene and a rubber-like elastic substance: 30 to 95 parts by weight; (B) a syndiotactic polystyrene having a melting point of not higher than 255° C.: 70 to 5 parts by weight; (C) a polyphenylene ether having an intrinsic viscosity of 0.5 deciliter/g or less as measured in chloroform at 25° C.; (D) an inorganic filler; and (E) a polymer having compatibility or affinity with components (A) and (B) and having a polar group. The styrene resin composition exhibits improved solvent resistance and remarkable impact resistance. The composition of the invention is produced by kneading the components within a resin temperature range between the melting point of component (B) and 270° C.

Abstract: Disclosed is a syndiotactic, polystyrenic resin composition comprising (A) 100 parts by weight of a component composed of (a) from 10 to 98% by weight of a styrene-based polymer having a syndiotactic configuration and (b) from 2 to 90% by weight of a polyolefin, (B) from 0.5 to 50 parts by weight of a styrene-olefin copolymer having a styrene content of from 40 to 85% by weight, and optionally (C) from 0.5 to 10.0 parts by weight, relative to 100 parts by weight of the component (a) of (A), of a polyphenylene ether (having an intrinsic viscosity in chloroform at 25° C. of 0.4 dl/g or higher) and/or (D) from 0 to 200 parts by weight, relative to 100 parts by weight of the component (b) of (A), of a styrene-olefin copolymer having a styrene content of from 5 to 35% by weight and/or (E) from 0 to 200 parts by weight, relative to 100 parts by weight of the component (b) of (A), of at least one selected from paraffinic oils, paraffinic waxes, mineral oils and siloxanic oils.

Abstract: Provided is a polyarylene sulfide resin composition comprising (A) from 20 to 34% by weight of a polyarylene sulfide having a melt viscosity of from 150 to 800 poises, (B) from 66 to 80% by weight of spherical silica having a mean particle size of from 0.3 to 10 &mgr;m, and (C) from 0 to 12% by weight of whiskers, in which the total of the spherical silica (B) and the whiskers (C) falls between 66 and 80% by weight. The composition has well-balanced physical properties of dimensional accuracy and mechanical strength, and has good moldability. It is favorable to moldings for precision members such as optical fiber connector ferrules, etc.

Abstract: An ultrasonic injection mold for an optical disk includes a movable die and a fixed die; a disk molding cavity formed between the movable die and the fixed die; a stamper positioned at the bottom of the cavity for forming a pit on a surface of the disk; and an ultrasonic generation device provided on the movable die or fixed die for applying ultrasonic waves to the cavity in performing infection molding. One or more slits are formed on the movable die and the fixed die in the direction which crosses the radial direction of the cavity. The ultrasonic injection mold minimizes the amplitude of the ultrasonic transmitted in the radial direction of the cavity.

Abstract: Provided are a flame-retardant thermoplastic resin composition comprising 100 parts by weight of a resin mixture of (A) from 50 to 95% by weight of a polycarbonate resin and (B) from 5 to 50% by weight of a styrenic resin, from 0.1 to 10 parts by weight of (C) red phosphorus, and from 5 to 50 parts by weight of (D) talc, and its injection moldings. The composition comprising a polycarbonate resin and a styrenic resin is troubled little by red coloration with red phosphorus therein. The composition can be well molded into pale color or light color moldings. The color tone and the outward appearance of the moldings are both good, and the heat resistance, impact resistance, rigidity and even the flame retardancy of the moldings are much improved. In the composition, red phosphorus is preferably stabilized.

Abstract: There are disclosed a process for producing a polyarylene sulfide through polymerization condensation of a sulfur source and a dihalogenated aromatic compound by using a polymerization vessel equipped with baffles that are asymmetrically arranged in the polymerization vessel or in the form of round bar, or by using a polymerization vessel equipped with an agitational blade which is devoid of a notch in the vicinity of the tip portion of the blade, and is in such a configuration as substantially equalizing the spacing between the tip portion thereof and the opposite bottom portion and/or end portion of the polymerization vessel all over the tip portion thereof; and an apparatus used for the process. The process and apparatus enables to form a uniform dispersion state of polymer phase in the vessel and to produce polyarylene sulfide having a high molecular weight.

Abstract: Disclosed are polycarbonates which are obtained by preparing a polycarbonate prepolymer through prepolymerization followed by polymerizing it through solid-phase, swollen solid-phase or thin film melt-phase transesterification, and have a remaining monomer content of smaller than 100 ppm, especially a dihydroxy compound content of smaller than 100 ppm, or have an acetone soluble content of at most 3.5 or at most 3.0% by weight, or have a terminal hydroxyl fraction of smaller than 2 or smaller than 15 mol %; and optical materials and blow molding materials comprising the polycarbonate. The polycarbonates contain a reduced amount of impurities such as remaining monomers, oligomers and others and have improved physical properties including impact strength, and these are useful as optical materials and blow molding materials.

Abstract: The invention provides a catalyst comprising a transition metal compound which has a nitrogen-containing tridentate ligand and of which the transition metal is of Groups 8 to 10 of the Periodic Table, and an organoaluminium compound, the catalyst of the invention has high activity. In the method of using the catalyst for producing polyolefins, of which the advantages are that the catalysts do not require methylaluminoxane which is expensive and difficult to handle, and of which storage stability is poor, and is extremely dangerous. The invention realizes efficient production of polyolefins (especially polyethylene) on an industrial scale.

Abstract: Disclosed is a method for producing blow moldings of essentially polycarbonate resin. The blow moldings may have a relatively high percentage of hollowness, and may have a ribbed structure, and their wall thickness is uniform. Forming ribs in the blow moldings is easy. Also disclosed is a polycarbonate resin composition for the method. The polycarbonate resin composition is for gas assist injection molding and comprises (A) from 30 to 100% by weight of a polycarbonate resin and (B) from 0 to 70% by weight of a styrenic resin. The melt viscosity ratio, &eegr;H/&eegr;L, of the melt viscosity of the resin composition, &eegr;H (Pa·sec), measured at a shear rate of 10 (sec−1) at the optimum molding temperature to the melt viscosity thereof, &eegr;L (Pa·sec), at a shear rate of 1000 (sec−1), is at least 5.

Abstract: A process for producing a polymer of an &agr;-olefin which comprises polymerizing an &agr;-olefin having at least 4 carbon atoms in the presence of a catalyst for producing polymers of olefins which comprises (A) a specific metal compound and (B) at least one compound selected from (b-1) an organoaluminum oxy compound and (b-2) an ionic compound.

Abstract: The method of forming a light-weight, fiber-reinforced, particularly glass fiber-reinforced-thermoplastic resin product includes the steps of melting and mixing thermoplastic resin pellets containing parallely oriented fibers 2-100 mm long, injecting the melted resin into a cavity which is closed so that its volume is smaller than that of the final molded product, and, before or after the resin injection is completed, opening the cavity until its volume is equal to that of the final molded product. Unlike the conventional injection-molded products, this product does not require a foaming agent and, if it uses any, requires only a small amount of foaming agent. The product thus formed is light in weight and has fibers uniformly entangled inside, providing an excellent appearance of the surface. Further a skin layer is formed over the surface. These features combined with the reinforcement by the glass fibers offer high strength and high stiffness.