In the glass fiber-reinforced resin molded article, the glass fiber has a flat cross-sectional shape having a ratio of the major axis to the minor axis (major axis/minor axis) in the range of 5.0 to 10.0, the thermoplastic resin is polyaryletherketone, the number average fiber length L of the glass fiber having a length of 25 μm or more contained in the glass fiber-reinforced resin molded article is in the range of 50 to 300 μm, the proportion P.sub.S of the glass fiber having a length of 25 to 100 μm contained in the glass fiber-reinforced resin molded article is in the range of 20.0 to 60.0%, the proportion P.sub.L of the glass fiber having a length of 500 m or more is in the range of 1.0 to 15.0%; and the L, P.sub.S, P.sub.L satisfy the following formula (1). 39.5≤L×P.sub.S.sup.2/(1000×P.sub.L)≤82.4 . . . (1)

In the glass fiber-reinforced resin molded article, the glass fiber has a flat cross-sectional shape having a ratio of the major axis to the minor axis (major axis/minor axis) in the range of 5.0 to 10.0, the thermoplastic resin is polyaryletherketone, the number average fiber length L of the glass fiber having a length of 25 μm or more contained in the glass fiber-reinforced resin molded article is in the range of 50 to 300 μm, the proportion P.sub.S of the glass fiber having a length of 25 to 100 μm contained in the glass fiber-reinforced resin molded article is in the range of 20.0 to 60.0%, the proportion P.sub.L of the glass fiber having a length of 500 m or more is in the range of 1.0 to 15.0%; and the L, P.sub.S, P.sub.L satisfy the following formula (1). 39.5≤L×P.sub.S.sup.2/(1000×P.sub.L)≤82.4 . . . (1)

A curable thermosetting composition, comprising a capped poly(arylene ether) copolymer comprising a reactive end group, wherein the capped poly(arylene ether) copolymer is derived from an alkyl, aryl-phenol.

A curable thermosetting composition, comprising a capped poly(arylene ether) copolymer comprising a reactive end group, wherein the capped poly(arylene ether) copolymer is derived from an alkyl, aryl-phenol.

A novel polymer having high glass transition temperature and an excellent balance between heat resistance, high refractive index and mechanical properties, and a composition and molded article containing the polymer are provided. The polymer according to the invention has a first structural unit represented by at least one of formulae (1-1), (1-2) and (1-3) below and a second structural unit having either a secondary amino structure or a tertiary amino structure at two or more terminals. ##STR00001##

A novel polymer having high glass transition temperature and an excellent balance between heat resistance, high refractive index and mechanical properties, and a composition and molded article containing the polymer are provided. The polymer according to the invention has a first structural unit represented by at least one of formulae (1-1), (1-2) and (1-3) below and a second structural unit having either a secondary amino structure or a tertiary amino structure at two or more terminals. ##STR00001##

A method of forming a polymer matrix composite using a soluble derivative of a poly (aryl ether ketone) (PAEK). The method includes mixing a starting PAEK polymer with a solvent and an acid, said solvent being selected from a group consisting of diethylether, tetrahydrofuran (THF), dioxin, and chlorinated solvents; reacting the PAEK mixture with a Lewis acid and a thiol compound in amounts effective to form a poly (aryl ether thioacetal) compound which comprises at least one thioacetal group; and impregnating a plurality of fibers in a solution comprising said poly (aryl ether thioacetal) compound.

A method of forming a polymer matrix composite using a soluble derivative of a poly (aryl ether ketone) (PAEK). The method includes mixing a starting PAEK polymer with a solvent and an acid, said solvent being selected from a group consisting of diethylether, tetrahydrofuran (THF), dioxin, and chlorinated solvents; reacting the PAEK mixture with a Lewis acid and a thiol compound in amounts effective to form a poly (aryl ether thioacetal) compound which comprises at least one thioacetal group; and impregnating a plurality of fibers in a solution comprising said poly (aryl ether thioacetal) compound.

A film containing a resin composition containing an aromatic polyetherketone resin (I) and a fluorine-containing copolymer (II). The fluorine-containing copolymer (II) defines a dispersed phase at an average dispersed particle size of 5 .Math.m or smaller. The aromatic polyetherketone resin (I) has a crystallinity of lower than 6%.

A film containing a resin composition containing an aromatic polyetherketone resin (I) and a fluorine-containing copolymer (II). The fluorine-containing copolymer (II) defines a dispersed phase at an average dispersed particle size of 5 .Math.m or smaller. The aromatic polyetherketone resin (I) has a crystallinity of lower than 6%.