Abstract: A method for manufacturing a carbon fiber is provided which involves: (1) immersing a carbon fiber composite material (CFC) in an acidic aqueous solution to elute at least a part of a resin component of the CFC, to thereby obtain a substantially fibrous product; and (2) immersing the substantially fibrous product obtained in step (1) in an alkaline aqueous solution to elute at least a part of a resin component of the substantially fibrous product, to thereby obtain a fibrous product. A method for manufacturing a carbon fiber reinforced resin composition is provided which involves manufacturing a carbon fiber by the above method and manufacturing a carbon fiber reinforced resin composition using the resulting carbon fiber. Using these methods, it is possible to recover and recycle a carbon fiber from a carbon fiber composite material (CFC) at a low cost without deteriorating the carbon fiber.

Abstract: A method for manufacturing a carbon fiber is provided which involves: (1) immersing a carbon fiber composite material (CFC) in an acidic aqueous solution to elute at least a part of a resin component of the CFC, to thereby obtain a substantially fibrous product; and (2) immersing the substantially fibrous product obtained in step (1) in an alkaline aqueous solution to elute at least a part of a resin component of the substantially fibrous product, to thereby obtain a fibrous product. A method for manufacturing a carbon fiber reinforced resin composition is provided which involves manufacturing a carbon fiber by the above method and manufacturing a carbon fiber reinforced resin composition using the resulting carbon fiber. Using these methods, it is possible to recover and recycle a carbon fiber from a carbon fiber composite material (CFC) at a low cost without deteriorating the carbon fiber.

Abstract: Provided are carbon fibers rich in surface functional groups, which has been recovered by thermolysis and anodization of a carbon-fiber-reinforced composite material. Also provided is a carbon-fiber-reinforced resin composition characterized by having excellent mechanical characteristics and an excellent surface appearance at a low cost as a result of using said carbon fibers.

Abstract: A rubber-modified thermoplastic resin is obtained by polymerizing (b) an aromatic vinyl compound and (c) a vinyl cyanide compound in the presence of (a) a rubbery polymer, and in which the content of the component (a) is 50 to 85% by weight, the content of the component (b) is 5 to 48% by weight and the content of the component (c) is 2 to 45% by weight, and which resin has a Q value of 30.times.10.sup.-4 to 50.times.10.sup.-3 and a grafting degree of 5% by weight or more. A thermoplastic resin composition comprising the above rubber-modified thermoplastic resin and at least one other thermoplastic resin is prepared.

Abstract: A rubber-reinforced styrene resin composition consisting essentially of:(1) 2-30% by weight of a grafted rubbery polymer wherein less than 30 parts by weight of a polymer of at least an aromatic alkenyl compound and an alkenyl cyanide compound are grafted onto 100 parts by weight of a conjugated diene rubber (I) having a weight average particle size of 0.26-0.6 .mu.m and a gel content of 30-80% by weight;(2) 5-40% by weight of a grafted rubbery polymer wherein 30 parts by weight or more of a polymer of at least an aromatic alkenyl compound and an alkenyl cyanide are grafted onto 100 parts by weight of a conjugated diene rubber (II) having a weight average particle size of 0.26-0.6 .mu.m and a gel content of 30-80% by weight; and(3) 40-93% by weight of a styrene copolymer of a monomer component consisting of at least one aromatic alkenyl compound and an alkenyl cyanide compound, and the difference between grafting degree of the component (1) and the grafting degree of component (2) being 15% by weight or more.

Abstract: A thermoplastic resin containing a graft copolymer obtained by graft-copolymerizing at least one vinyl monomer onto colloidal silica-core silicone-shell particles, and a process for producing the thermoplastic resin.A colloidal silica-core silicone-shell particles comprising(A) from 99.9 to 5% by weight of cores which are colloidal silica particles, and(B) from 0.1 to 95% by weight of shells comprising an organosiloxy group represented by the formula ##STR1## wherein R.sup.1 which may be the same or different each represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms, Q represents hydrogen atom or an alkyl group having 1 to 6 carbon atoms, p is an integer of 1 to 3, and q is an integer of 0 to 2, with proviso that (p+q) is an integer of 1 to 3, and/or a polyorganosiloxane represented by the average composition formula ##EQU1## wherein R.sup.

Abstract: An instant-setting adhesive composition comprising a 2-cyanoacrylate and at least one 1,1-disubstituted diene, the amount of said 1,1-disubstituted diene exceeding 50% by weight based on the total weight of both components. This composition is useful in the same fields as those where conventional 2-cyanoacrylate adhesives have been used, and is excellent in impact resistance, peel resistance, heat resistance and water resistance.