Abstract: An interfacial polymerization process for preparing high molecular weight aromatic polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of a 5 to 8 membered heterocyclic compound which contains only carbon and nitrogen atoms in the ring and further characterized in that the ring contains at least two nitrogen atoms and at least one carbon atom, and in that the ring is aromatic in character and contains a maximum amount of olefinic unsaturation.

Abstract: An improved process for obtaining halogenated diphenols which can be pure dihalodiphenols or predetermined, statistical mixtures comprising unreacted diphenol, monohalodiphenols and dihalodiphenols.

Abstract: A plasticized polycarbonate composition comprising in admixture a high molecular weight aromatic carbonate polymer and a minor amount of an organic plasticizer, said organic plasticizer being represented by the following general formula: ##STR1## wherein R and R.sub.1 are independently selected from the group consisting of C.sub.1 to C.sub.30 alkyl, aryl of 6 to 14 carbon atoms and substituted aryl wherein the substituents on said substituted aryl are C.sub.1 to C.sub.30 alkyl, halogen, C.sub.1 to C.sub.30 alkoxy, aryloxy of 6 to 14 carbon atoms, alkylthio of 1 to 30 carbon atoms and arylthio of 6 to 14 carbon atoms; R.sub.2 is C.sub.1 to C.sub.30 alkylene, arylene of 6 to 14 carbon atoms, alkarylene of 7 to 30 carbon atoms, aralkylene of 7 to 30 carbon atoms and ##STR2## wherein W is selected from the group consisting of: (a) --O--;(b) --S--; ##STR3## wherein X and Y are independently selected from the group consisting of halogen and C.sub.1 to C.sub.12 alkyl.

Abstract: Novel tetraphenolic compounds are disclosed. These compounds have utility as branching agents in the production of novel, randomly branched polycarbonates.

Abstract: An interfacial polymerization process for preparing high molecular weight polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of a sterically hindered heterocycloaliphatic secondary amine or a salt thereof.

Abstract: An interfacial polymerization process for preparing high molecular weight aromatic polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of a cyclic amidine.

Abstract: An interfacial polymerization process for preparing a high molecular weight aromatic carbonate polymer by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of a compound selected from pyrroles and pyrrole salts.

Abstract: An improved process for obtaining halogenated diphenols which can be pure dihalodiphenols or predetermined, statistical mixtures comprising unreacted diphenol, monohalodiphenols and dihalodiphenols.

Abstract: A plasticized polycarbonate composition comprising in admixture a high molecular weight aromatic carbonate polymer and a minor amount of an organic plasticizer.

Abstract: A plasticized polycarbonate composition comprising an admixture of a high molecular weight aromatic polycarbonate and a plasticizing amount of an organotin plasticizer.

Abstract: An interfacial polymerization process for preparing high molecular weight polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of an iminoether or its salt.

Abstract: An interfacial polymerization process for preparing a high molecular weight aromatic carbonate polymer by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of a nitrogen-containing crown-cyclic compound.

Abstract: A flame retardant polycarbonate composition comprising in admixture an aromatic carbonate polymer and a minor amount of a mixture of a metal salt of an organic sulfonate or organic carboxylate, and an organic halogenated compound.This invention relates generally to flame retardant polycarbonate compositions and more particularly to flame retardant compositions containing an aromatic carbonate polymer and a minor amount of a mixture of a metal salt of an organic sulfonate or organic carboxylate, and an organic halogenated compound.

Abstract: An interfacial polymerization process for preparing high molecular weight polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of a non-cyclic amidine.

Abstract: An interfacial polymerization process for preparing a high molecular weight aromatic carbonate polymer by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of certain cyclic iminoethers or their salts.

Abstract: An interfacial polymerization process for preparing high molecular weight aromatic polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of an amino amidine or amino guanidine.

Abstract: An interfacial polymerization process for preparing a high molecular weight aromatic carbonate polymer by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of a cyclic isourea compound.

Abstract: An interfacial polymerization process for preparing a high molecular weight aromatic carbonate polymer by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of an isourea compound.

Abstract: Thermally stable translucent polycarbonate compositions comprising an admixture of an aromatic polycarbonate and a minor amount of a partially fluorinated polyolefin.

Abstract: An improved flame retardant polycarbonate composition of an aromatic carbonate polymer in admixture with an organic alkali metal salt or an organic alkaline earth metal salt which composition has in admixture therewith other organic alkali metal salt or organic alkaline earth metal salt such that the salt mixture contains at least two different cationic components.