Abstract: Blow moldable polycarbonate is produced by first producing a polycarbonate preform by a melt transesterification process. The polycarbonate preform comprises 2.1 to 10 mole percent polyfunctional branching agent, based on the total moles of polycarbonate in the polycarbonate preform. The polycarbonate preform is then melt equilibrated with a second polycarbonate to produce a blow moldable grade.

Abstract: UV stabilized polycarbonates are provided having chemically combined polyhydric phenol benzotriazole carbonate units, such as 1,1-bis(4-hydroxyphenyl)-1-[4-hydroxy-3-(N-2-benzotriazole)phenyl]ethane carbonate units and methods for making. Incorporation of the polyhydric phenol benzotriazole functional units into the polycarbonate backbone can be achieved by redistribution or transesterification under melt polymerization conditions.

Abstract: Macrocyclic oligomers, including polycarbonates, polyesters, polyamides, polyimides, polyetherketones and polyethersulfones, are conveniently prepared from various spiro(bis)indane compounds, especially the 6,6'-difunctional 3,3',3'-tetramethylspiro(bis)indanes. The macrocyclic oligomers may be conveniently converted to linear polymers.

Abstract: Linear polyamide and polyimide copolysiloxane compositions are prepared by contacting a strongly acidic catalyst, basic catalyst or alkali metal fluoride with a macrocyclic spirobiindane polyamide or polyimide disiloxane, either alone or in combination with a cyclic polysiloxane such as octamethylcyclotetrasiloxane.

Abstract: Cyclic polyarylate oligomer compositions are prepared by the reaction of an aromatic dicarboxylic acid halide, such as isophthaloyl chloride or terephthaloyl chloride, with a water-soluble salt of a dihydroxyaromatic compound, such as bisphenol A disodium salt. Freshly prepared solutions of the halide in an organic liquid such as methylene chloride, and of the salt in water, are simultaneously introduced into an organic liquid containing a catalytic amount of at least one quaternary ammonium salt having a single alkyl group containing about 8-20 carbon atoms and having not more than 5 additional carbon atoms. The dihydroxyaromatic compound salt is employed in the amount of at least about 3% in excess of stoichiometric.

Abstract: Copolyamides are prepared by the reaction of monocyclic spiro(bis)indane polyamide oligomers with lactams in the presence of basic reagents.

Abstract: Heterocyclic quaternary ammonium salts such as N,N-di-n-butylpiperidinium bromide are excellent phase transfer agents for the preparation of aromatic ethers, as by the reaction of the disodium salt of bisphenol A with 4-nitro-N-methylphthalimide.

Abstract: Macrocyclic oligomers, including polycarbonates, polyesters, polyamides, polyimides, polyetherketones and polyethersulfones, are conveniently prepared from various spiro(bis)indane compounds, especially the 6,6'-difunctional 3,3',3'-tetramethylspiro(bis)indanes. The macrocyclic oligomers may be conveniently converted to linear polymers.