High molecular weight polyhalobisphenol polycarbonates are produced by adding phosgene to a polyhalobisphenol in the alkali metal phenate form whereby the chloroformates of the bisphenol are formed and then adding an activated pyridine such as 4-aminopyridines or 2-substituted pyridines to generate a high molecular weight polycarbonate having an inherent viscosity in the range from about 0.4 to about 0.9.

Os polycarbonates elevados do polyhalobisphenol do peso molecular são produzidos adicionando o phosgene a um polyhalobisphenol no formulário alcalino do phenate por meio de que os chloroformates do bisphenol são dados forma e então adicionando um pyridine ativado tal como os pyridines 4-aminopyridines ou 2-substituted para gerar um polycarbonate elevado do peso molecular que tem uma viscosidade inerente na escala de aproximadamente 0.4 a aproximadamente 0.9.

 
Web www.patentalert.com

< High impact strength, flame retardant polycarbonate composition

< Composition and process for polymerizing aromatic cyclic carbonate oligomers admixed with carbon materials

> Process for the preparation of polycarbonate and/or polyarylate block copolymers with poly(aryl ethers)

> Process for the preparation of polycarbonate and/or polyarylate block copolymers with poly(aryl ethers)

~ 00071