Asahi Kasei Kogyo Kabushiki Kaisha

Takashi Fujiwara

Seiichi Manabe

Tetsuo Matsushita

Shuji Kajita

Tsuneo Igarashi

Goro Furumoto

Tamio Ishitobi

Hideo Kasatani

The present invention relates to a novel composite material, that is, a prepreg, obtained by bonding a film (1) comprised of an organic polymer having substantially no melting point and having a high modulus of 700 kg/mm.sup.3 or more and a high strength of 35 kg/mm.sup.2 or more and a resin layer (2) and/or fiber-reinforced layer (3), a composite molded body, and a method of manufacturing a composite molded body. The composite molded body obtained by bonding the film (1) and the resin layer (2) of the present invention has superior strength, excellent pliability, and large toughness in all directions. Further, the composite molded body obtained by bonding the film (1) and the fiber-reinforced resin layer (3) has both an extremely large impact resistance which could never be obtained with conventional molded bodies and also a strength and modulus greater than in the past. The molded body can be suitably used for aerospace equipment, sports goods, leisure goods, etc. making use of its light weight, corrosion resistance, and other properties in addition to the above superior proportion.

Prepreg, composite molded body and method of manufacture of the

The present invention relates to a novel composite material, that is, a prepreg, obtained by bonding a film (1) comprised of an organic polymer having substantially no melting point and having a high modulus of 700 kg/mm.sup.2 or more and a high strength of 35 kg/mm.sup.2 or more and a resin layer (2) and/or fiber-reinforced layer (3), a composite molded body, a method of manufacturing a composite molded body. The composite molded body obtained by bonding the film (1) and the resin layer (2) of the present invention has superior strength, excellent pliability, and large toughness in all directions. Further, the composite molded body obtained by bonding the film (1) and the fiber-reinforced resin layer (3) has both an extremely large impact resistance which could never be obtained with conventional molded bodies and also a strength and modulus greater than in the past. The molded body can be suitably used for aerospace equipment, sports goods, leisure goods, etc. making use of its light weight, corrosion resistance, and other properties in addition to the, above superior properties.

Prepreg, composite molding body, and method of manufacture of the

Poly(p-phenyleneterephthalamide) fibers having a very high tensile strength is described. The fibers consist essentially of poly(p-phenyleneterephthalamide) having an inherent viscosity of at least 5 dl/g as determined at 25.degree. C. in sulfuric acid having a concentration of 98 wt. % at a polymer concentration of 0.5 g/dl. The fibers are composed of single filaments of 0.5 to 3 denier, wherein the single filament tensile strength is at least 35 g/denier. The macrovoid number, hereinbefore defined, of the fibers is not more than 10 per 100 mm. The asymmetry, hereinbefore defined, of the fibers is not more than 0.2.

Poly(P-phenyleneterephthalamide) fibers

A polyester having a melt anisotropy, which consists essentially of structural units represented by the following formulae is described. ##STR1## wherein X is hydrogen, chlorine, methyl, ethyl, propyl, butyl, methoxy, ethoxy, nitro or cyano, Ar is selected from 1,4-phenylene, chloro-1,4-phenylene, methyl-1,4-phenylene, 4,4'-biphenylene, 3,5,3',5'-tetramethyl-4,4'-biphenylene, 1,4-naphthalene, 1,5-naphthalene, 2,6-naphthalene, dimethyl-1,4-phenylene, trimethyl-1,4-phenylene and oxy-4,4'-diphenylene, and k, l, m and n represent molar fractions of the corresponding units and they satisfy the following requirements: ##EQU1## and

Polyester of substituted or unsubstituted phenoxyhydroquinone

A high Young's modulus poly-p-phenylene-terephthalamide fiber having a unique fine-structure and excellent properties, including excellent resistance to lateral stress and to friction. The fiber is made by extruding an anisotropic dope in a non-coagulating layer, passing the extrudate through a coagulating layer, washing and drying the resulting coagulated fibers in the absence of substantial tension, and heating the fibers under tension.

Process for the preparation of high Young's modulus

A poly-p-phenylene-terephthalamide fiber with excellent fatigue resistance resulting from a unique combination of properties. The fibers are prepared by extruding an anisotropic polymer dope in a non-coagulating layer, passing the extrudate through a coagulating layer, depositing the resulting coagulated fibers on a net conveyor, and in the absence of substantial tension sequentially washing the fibers, holding the fibers in saturated steam, and drying the fibers under specified conditions.

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Nobeoka, Japan

Takashi Fujiwara