Abstract: A polycarbonate resin composition that is enhanced in flame retardancy while maintaining transparency containing (A) a polycarbonate resin component containing from 10 to 90% by mass of (A-1) an aromatic polycarbonate resin containing a dihydroxybiphenyl as a part of a dihydric phenol, from 10 to 90% by mass of (A-2) an aromatic polycarbonate-polyorganosiloxane copolymer, and from 0 to 80% by mass of (A-3) an aromatic polycarbonate resin other than (A-1) and (A-2), and a molded product thereof. In the flame retardant polycarbonate resin composition, the content of the polyorganosiloxane in (A) is preferably from 0.3 to 1.6% by mass, and the composition may contain from 0.01 to 1 part by mass of (B) an organic metal salt per 100 parts by mass of (A).

Abstract: A method for producing a PC copolymer with improved productivity is provided. The PC copolymer has a specific structure and the method uses a diester diol-containing monomer as a raw material. The polycarbonate copolymer is produced by reacting a diester diol-containing monomer, a divalent phenol, and a carbonate precursor by interfacial polymerization, wherein the diester diol-containing monomer is a product of reaction between a hydroxybenzoic acid or an esterified product thereof and a polyalkylene glycol, wherein the esterification degree of hydroxyl groups of the polyalkylene glycol is 50 to 90 mol %.

Abstract: A method for producing a polycarbonate copolymer having structural repeating units represented by formulas (I) and (II): wherein each of R1 and R2, X, R3, R4, Y, a to d and n are defined in the application by reacting (A) a dihydric phenol, (B) a phenol-modified diol and (C) a carbonate precursor, wherein the phenol-modified diol is contains 500 ppm by mass or less of a hydroxybenzoic acid.

Abstract: A method for producing a PC copolymer with improved productivity is provided. The PC copolymer has a specific structure and the method uses a diester diol-containing monomer as a raw material. The polycarbonate copolymer is produced by reacting a diester diol-containing monomer, a divalent phenol, and a carbonate precursor by interfacial polymerization, wherein the diester diol-containing monomer is a product of reaction between a hydroxybenzoic acid or an esterified product thereof and a polyalkylene glycol, wherein the esterification degree of hydroxyl groups of the polyalkylene glycol is 50 to 90 mol %.

Abstract: The invention provides a method for producing a PC copolymer having a specific structure from a diester diol serving as a starting material, which method attains enhanced productivity. The method for producing a polycarbonate copolymer through interfacial polymerization, the copolymer having structural repeating units represented by formulas (I) and (II), wherein a phenol-modified diol having a hydroxybenzoic acid content of 500 ppm by mass or less is employed as a starting material. In formulas (I) and (II), each of R1 and R2 represents a C1 to C6 alkyl group; X represents a single bond, a C1 to C8 alkylene group, a C2 to C8 alkylidene group, a C5 to C15 cycloalkylene group, a C5 to C15 cycloalkylidene group, —S—, —SO—, —SO2—, —O—, —CO—, etc. Each of R3 and R4 represents a C1 to C3 alkyl group; Y represents a C2 to C15 linear-chain or branched alkylene group; a to d are integers of 0 to 4; and n is an integer of 2 to 450.

Abstract: The present invention is a process for the production of polyarylene sulfide based resin, wherein in washing a polyarylene sulfide based resin with a mixed solvent of an aprotic organic solvent and water in a softened or molten state, the polyarylene sulfide based resin partially dissolved in the washing liquid is recovered, to be specific, the polyarylene sulfide based resin dissolved in the washing liquid is precipitated, separated and recovered by cooling the washing liquid after washing and/or adding water to the washing liquid, and it is reused. According to the present invention, capable of being provided is a process for the production of polyarylene sulfide based resin in which the polyarylene sulfide based resin formed by polymerization is scarcely lost in washing the above resin with a solvent.

Abstract: The present invention is a process for the production of polyarylene sulfide based resin, wherein in washing a polyarylene sulfide based resin with a mixed solvent of an aprotic organic solvent and water in a softened or molten state, the polyarylene sulfide based resin partially dissolved in the washing liquid is recovered, to be specific, the polyarylene sulfide based resin dissolved in the washing liquid is precipitated, separated and recovered by cooling the washing liquid after washing and/or adding water to the washing liquid, and it is reused. According to the present invention, capable of being provided is a process for the production of polyarylene sulfide based resin in which the polyarylene sulfide based resin formed by polymerization is scarcely lost in washing the above resin with a solvent.

Abstract: There is disclosed a process for producing a polyarylene sulfide which comprises reacting a sulfur source with a dihalogenated aromatic compound in an aprotic organic solvent, characterized by adding the dihalogenated aromatic compound by dividing the same into a plurality of times at the time of polymerization reaction. It is made possible by the present invention to provide a process for efficiently producing polyarylene sulfide which has a high molecular weight and is excellent in thermal stability.

Abstract: Provided are a polyarylene sulfide resin and its composition of which the moldings are burred little and which has good mechanical properties and good flow moldability. The composition comprises from 20 to 90% by weight of a polyarylene sulfide and from 10 to 80% by weight of an inorganic filler, and is characterized in that its burrs are on the level of at most 120 &mgr;m, that it has a weld strength of at least 50 MPa and that the length of its spiral flow having a thickness of 1 mm is at least 100 mm. Preferably, the polyarylene sulfide to be in the composition has a specific index to the degree of branching and a specific flexural strength.