Abstract: Disclosed herein is a process for producing a resin having carbonate bonding, comprising polymerizing a hydroxydiaryl compound and phosgene in an organic solvent of methylene chloride such that the concentration of carbon tetrachloride in phosgene and methylene chloride in the polymerization system satisfies the following equation:A+5B.ltoreq.200(wherein A represents carbon tetrachloride concentration (ppm) in phosgene and B represents carbon tetrachloride concentration (ppm) in methylene chloride).

Abstract: A particulate polycarbonate resin composition which is separated from a solution of an inorganic filler-containing polycarbonate in an organic solvent at a temperature lower than the melting point of the polycarbonate, and contains an inorganic filler, said composition having a particle size distribution n of from 3 to 8 as represented by the following Rosin-Rammler distribution equationR=100 exp (-b Dp.sup.n)where R is an on-sieve amount (% by weight), Dp is a particle diameter (mm), and b is a constant, the particle diameter of the 50% on-sieve weight integration being from 0.5 to 6 mm, and the bulk density being from 0.1 to 0.7 g/ml.

Abstract: An aromatic polyesterpolycarbonate containing a dihydroxy-diaryl compound residue, a terephthalic acid residue and/or isophthalic acid residue, and a carbonate bond in a molar ratio of 1:0.25-0.75:0.75-0.25 is prepared by first mixing and reacting an aqueous alkaline solution of a dihydroxy-diaryl compound, an organic solvent solution of terephthaloyl chloride and/or isophthaloyl chloride, and phosgene to obtain a polyesterpolycarbonate oligomer having --OCOCl groups, --COCl groups and --OH groups as end groups and then subjecting the oligomer to polycondensation with a caustic alkali in the substantial absence of the dihydroxy-diaryl compound.

Abstract: A process for producing an aromatic polyesterpolycarbonate, which comprises polycondensing (a) a dihydroxydiaryl compound, (b) a terephthaloyl chloride and/or isophthaloyl chloride reactant, and (c) phosgene by an interfacial polymerization process in the presence of water, methylene chloride and an acid binding agent thereby preparing an aromatic polyesterpolycarbonate product containing structural units of the formula: ##STR1## wherein X is a divalent group, and the aromatic rings may be substituted, and structural units of the formula: ##STR2## wherein X is a divalent group, and the aromatic rings may be substituted, said condensation reaction being characterized in that after at least 95% of the total --COCl groups in the terephthaloyl chloride and/or isophthaloyl chloride and phosgene starting materials has reacted, a chloroformate compound or additional phosgene is added to the reaction mixture in an amount to bring the concentration of --COCl groups to a level of 10 to 1000 .mu.

Abstract: An aromatic polyester-polycarbonate resin which comprises a polymer material composed of repeating units of structures I-III: ##STR1## wherein X is a divalent organic radical and the divalent aromatic entities in structures I, II and III may be substituted by hydrocarbon residues.

Abstract: An aromatic polyester-polycarbonate is prepared by(a) forming a low molecular weight polyester oligomer possessing terminal -OH groups by reacting a solution of a terephthaloyl chloride compound in an organic solvent with a dihydroxy-diaryl compound in an aqueous alkaline solution;(b) reacting said oligomer with phosgene thereby converting said terminal -OH groups to terminal -OCOCl groups; and(c) preparing the desired aromatic polyester-polycarbonate product by polycondensing the product of step (b) with a dihydroxy-diaryl compound in an aqueous alkaline solution.

Abstract: A polyester is produced in an improved process by esterification or interesterification of an aromatic dicarboxylic acid or an alkyl ester thereof with 1,4-butanediol followed by polycondensation of the resulting ester characterized in reusing the 1,4-dibutanediol mixture distilled in the polycondensation step without purification as a starting material for production of more polyester.