Abstract: In a pultrusion device for producing continuous length sections prepared from thermoplastic resins reinforced with long fibers, the vertical angle (&agr;) of an upstream conical surface of a conical portion, which constitutes a shaping nozzle perforated through the downstream end wall of the device ranges from 15 to 35 degrees and the shaping nozzle has a land portion having a length of 1 to 5 mm in the downstream area subsequent to the upstream conical surface. According to this pultrusion device for producing continuous length sections prepared from thermoplastic resins reinforced with long fibers, the long fibers never undergo any breakage nor fluffing during the opening treatment and this accordingly leads to the substantial reduction of pill-formation.

Abstract: In a pultrusion device for producing continuous length sections prepared from thermoplastic resins reinforced with long fibers, the vertical angle (&agr;) of an upstream conical surface of a conical portion, which constitutes a shaping nozzle perforated through the downstream end wall of the device ranges from 15 to 35 degrees and the shaping nozzle has a land portion having a length of 1 to 5 mm in the downstream area subsequent to the upstream conical surface. According to this pultrusion device for producing continuous length sections prepared from thermoplastic resins reinforced with long fibers, the long fibers never undergo any breakage nor fluffing during the opening treatment and this accordingly leads to the substantial reduction of pill-formation.

Abstract: An opening and resin-impregnation apparatus is used for impregnating a reinforcing fiber bundle (2) with a molten resin. The fiber bundle (2) is subjected to opening by bringing it into contact with opening pins (4). An auxiliary pin (5) is positioned within a specific region relative to the opening pin. The apparatus and a method which makes use of the apparatus permit the production of a continuous fiber-reinforced thermoplastic resin composite material having excellent impregnation characteristics and flexural strength while maintaining high stable productivity.

Abstract: A unidirectionally reinforced resin structure is manufactured by an apparatus which comprises a melt resin bath in which a melt resin is stored and into which a long fiber bundle passes, and a plurality of opening pins disposed in the melt resin bath. The long fiber bundle is impregnated with the melt resin and opened by the opening pins during the passing in the melt resin bath. The opening pins are arranged in a perpendicular direction with respect to the melt resin bath and the opening pins are composed of at least two groups in the perpendicular direction so as to open at least two long fiber bundles.

Abstract: The present invention relates to a method for producing a resin-impregnated structure reinforced by continuous fibers in which a practically endless continuous fiber bundle is dipped in a bath of molten resin and simultaneously passes through a space between a pair of opening pins. The opening pins can be positioned on sides of the bundle so that the continuous fibers are sandwiched by the pins without coming in contact with them. By doing so, the fibers of the bundle can be opened and can be impregnated with the resin. In addition, the foregoing continuous fiber-reinforced resin structure may be cut into pieces having a desired length to provide columnar products.

Abstract: A long fiber-reinforced polymer alloy resin composition (C) is provided which is obtained by blending a master batch (A) containing a long fiber reinforcement (a2) having a length of 3 to 30 mm in a resin matrix of a polyamide resin (a1), with a substantially polymer-alloyed resin diluent (B) obtained by melt kneading 45 to 20% by weight of a crystalline polyolefin resin (b1) and 55 to 80% by weight of a polyamide resin (b2), the crystalline polyolefin resin (b1) containing a modified olefin crystalline polymer (b11) having been substantially modified with unsaturated carboxylic acids. In this resin composition (C), the amount of the long fiber reinforcement (a2) is in the range of 10 to 60% by weight, and the amount of the crystalline polyolefin resin (b1) in resin components ((a1)+(b1)+(2)) other than the long finer reinforcement (a2) is in the range of 20 to 45% by weight. This resin composition (C) is excellent in tensile strength and particularly excellent in repeated impact resistance properties.

Abstract: A product is provided in a continuous length formed from a fiber-reinforced resin and having a shape ratio ?whole length of the contour of the section (Lmm)/real area of the section (Smm.sup.2)! of 0.5 to 2.5/mm and a thickness of 1 to 4 mm. This product in a continuous length is prominently excellent in tensile strength, though the amount of the fiber reinforcement contained in the product is almost the same as in conventional fiber-reinforced products. Hence, the product in a continuous length is favorably used as a spacer for concrete form.

Abstract: According to the present invention, there is provided a process for stably producing a compositely reinforced polypropylene composition having less warpage deformation and good moldability which includes the steps of using an extruder having at least three feed inlets, feeding an organic peroxide and a polypropylene resin selected from (a) a polypropylene modified by grafting an unsaturated organic acid thereonto, (b) a mixture of the resulting modified polypropylene and an unmodified polypropylene, (c) a mixture of an unsaturated organic acid and an unmodified polypropylene or (d) mixtures of the foregoing to the extruder through the first feed inlet of the extruder, feeding the lamellar inorganic filler thereto through the second feed inlet disposed at a position where the resin mixture is sufficiently melted and kneaded, feeding the glass fiber through the third feed inlet, and then melting and kneading these materials.

Abstract: The present invention provides a polypropylene resin composition which permits the formation of materials having high strength and stiffness, less warpage deformation and such excellent mechanical durability that these materials can be used when load is applied continuously for a long term or when load is applied repeatedly.The polypropylene resin composition contains the three components of (a) 40 to 75% by weight of a modified polypropylene obtained by heating and melting a mixture prepared by adding at least (1) 0.01 to 2% by weight of an unsaturated acid, (2) 0.1 to 3% by weight of an unsaturated silane and (3) an organic peroxide to a crystalline polypropylene, (b) 10 to 35% by weight of glass fibers, and (c) 15 to 45% by weight of a mica powder, and the components (b) and (c) are blended with the component (a) so that the total amount of the components (b) and (c) may be in the range of from 25 to 60% by weight based on the composition.

Abstract: The present invention provides a cylinder head cover for an internal combustion engine having excellent vibration-damping properties which is prepared by molding a composition comprising 75 to 30% by weight, based on the composition, of resin components comprising 50 to 80% by weight of a polyamide resin and 50 to 20% by weight of a modified polyolefin resin modified with an unsaturated acid or its derivative, the total of both the resins being 100% by weight, 15 to 30% by weight of glass fibers based on the composition, and 10 to 40% by weight of mica based on the composition.

Abstract: Polypropylene compositions reinforced by glass fibers having superiority in mechanical properties, rigidity and visual appearance are provided by melting and kneading a mixture of (A) polypropylene resin modified by an unsaturated carboxylic acid or an anhydride thereof or a polypropylene resin containing 5 parts by weight or more of polypropylene resin modified by an unsaturated carboxylic acid or an anhydride thereof, (B) a polyamide resin obtained by the polycondensation of metaxylene diamine and adipic acid and (C) glass fibers, each in specified amount.