Abstract: Provided are porous fibers and fiber structures that have large surface areas and large voids, and controlled hydrophilicity suitable for matrices of cell culture in the field of tissue engineering, and a method for producing the fiber structure including a step in which a solution is produced by dissolving a hydrophobic solvent-soluble polymer and an organic compound having a plurality of hydroxyl groups in a hydrophobic solvent, a step in which the solution is spun by electrospinning, and a step in which a fiber structure accumulated on a collector is obtained.

Abstract: A thermoplastic resin composition comprising:(A) 40 to 99.8 parts by weight of a rubber-modified styrene base thermoplastic resin,(B) 0.1 to 20 parts by weight of a copolymer having an epoxy group but comprising no olefin, and(C) 0.1 to 50 parts by weight of a polymer having at least one functional group selected from the group consisting of a carboxyl group, an acid anhydride group, a hydroxyl group and a nitrogen-containing base group with the total amount of the rubber-modified styrene base thermoplastic resin (A), the copolymer (B) and the polymer (C) being 100 parts by weight and the content of the rubber in the composition being from 5 to 40 % by weight based on the weight of the composition, which has good flowability and imparts a uniformly delustered surface and good impact resistance to a molded article.

Abstract: A thermoplastic resin composition having improved heat stability which comprises a thermoplastic resin which contains at least 5% by weight of an .alpha.-alkyl-substituted aromatic copolymer comprising .alpha.-alkyl-substituted aromatic vinyl compound and at least one other comonomer copolymerizable therewith, wherein the composition contains a metal-deactivating agent which has a molecular weight of not more than 2,000 and at least one group of the formula: ##STR1## or an organometallic colorant containing free metal in an amount of not more than 2,000 ppm, from which a molded article having no or less silver streaks can be produced.

Abstract: A resin composition comprising:(A) 10 to 90 parts by weight of a polyphenylene ether resin,(B) 8 to 88 parts by weight of an ABS resin,(C) 1 to 30 parts by weight of a first graft copolymer selected from the group consisting of(C-I) a graft copolymer which is obtainable by polymerizing a monomer mixture comprising an aromatic vinyl compound and at least one other compound copolymerizable therewith in the presence of a polymer (C-1) comprising an unsaturated nitrile compound, an aromatic vinyl compound and at least one other vinyl compound copolymerizable therewith and has a vinyl group at least at one of molecular ends, and(C-II) a graft copolymer which is obtainable by polymerizing at least one vinyl compound in the presence of a polymer (C-1) and a polymer (C-2) comprising the aromatic vinyl compound and at least one other compound copolymerizable therewith and has a vinyl group at least at one of molecular ends,(E) 1 to 30 parts by weight of a second graft copolymer which is obtainable by polymerizing a mo

Abstract: In the emulsion polymerization of an .alpha.-alkylstyrene and an unsaturated nitrile copolymerizable therewith in a weight proportion of 70:30 to 80:20 in the presence of a radical initiator, an improved process wherein the monomers are introduced into the reaction system in such a manner that the concentration of the unreacted unsaturated nitrile in the reaction system is not less than 31% by weight to the entire amount of the unreacted monomers in the reaction system at the completion of the introduction of the monomers, whereby a copolymer of the .alpha.-alkylstyrene and the unsaturated nitrile having an excellent thermal resistance is produced with marked decrease in the amount of unreacted monomers.

Abstract: A process for preparing a thermoplastic resin having high heat resistance by emulsion polymerization of an .alpha.-alkylstyrene compound of the formula: ##STR1## wherein R.sub.1 is C.sub.1 -C.sub.3 alkyl and R.sub.2 is hydrogen, C.sub.1 -C.sub.3 alkyl or halo(C.sub.1 -C.sub.3)alkyl and an unsaturated nitrile in a weight proportion of 65:35 to 80:20 in the presence of a radical initiator, characterized in that the whole amount of the .alpha.-alkylstyrene compound and 10 to 99% by weight of the unsaturated nitrile on the basis of its total amount are first subjected to polymerization and, after the polymerization, the remaining portion of the unsaturated nitrile is added to the reaction mixture and the resultant mixture is subjected to further polymerization until the polymerization is substantially completed.

Abstract: A process for preparing a thermoplastic resin having excellent heat resistance, impact resistance and processability, which comprises emulsion polymerization of a mixture comprising a monomeric mixture consisting essentially of an .alpha.-alkylstyrene, methyl methacrylate and an unsaturated nitrile and a diene rubber latex containing particles of 400 to 900 A in particle size in an amount of not less than 30% by weight in the presence of a radical initiator, the weight proportion of the monomeric mixture and the diene rubber latex (solids) being from 60:40 to 95:5.