Sabic Global Technologies B.v.

Shpp Global Technologies B.v.

Shivakumar Konda

Gaurav Mediratta

Pradeep Jeevaji Nadkarni

Venkata Rama Narayanan Ganapathy Bhotla

Salkod Parameshwar Mallika

Jordi Calveras

Shubashree Swaminathan

Chelsea Schmidt

Indira Jyothi Polasa

Thomas Paul Kanjirathadathil

Anup Krishnnan Appukuttan Pillai

The present invention relates to a method for the manufacture of a (co)polycarbonate comprising reacting tetrabromo bisphenol A and optionally one or more bisphenol comonomer(s) with phosgene wherein the tetrabromo bisphenol A contains an amount of tetrabromo bisphenol A dimer of at most 3.0 wt. % based on the weight of the tetrabromo bisphenol A, determined after heat treating the tetrabromo bisphenol A at a temperature of 260° C. for a period of 15 minutes.

Method for the manufacture of polycarbonate

A method for the manufacture of a 2-aryl-3,3-bis(hydroxyaryl)phthalimidine including heating a reaction mixture comprising a phenolphthalein compound and a primary arylamine in the presence of an acid catalyst, and a heterocyclic aromatic amine co-catalyst, to form the 2-aryl-3,3-bis(hydroxyaryl) is provided. Polymers including structural units derived from the 2-aryl-3,3-bis(hydroxyaryl)phthalimidine are provided. Methods for the manufacture of a polycarbonate, including manufacturing the 2-aryl-3,3-bis(hydroxyaryl)phthalimidine, and polymerizing the 2-aryl-3,3-bis(hydroxyaryl)phthalimidine in the presence of a carbonate source are provided.

Methods of manufacture of 2-aryl-3,3-bis(4-hydroxyaryl)phthalimidines, and polymers derived therefrom

Methods for synthesizing and purifying 2-aryl-3,3-bis(4-hydroxyaryl)phthalimidine compounds are provided. The method includes heating a reaction mixture including a phenolphthalein, a primary aryl amine, and an acid catalyst to form a phthalimidine; precipitating the phthalimidine from the reaction mixture to provide a crude phthalimidine; providing a solution including the crude phthalimidine, an additive, and at least one solvent; contacting the solution with one or more purification agents to provide a treated solution; precipitating and recovering a phthalimidine adduct from the treated solution; and recovering a purified phthalimidine compound from the adduct.

Methods for purifying 2-aryl-3,3-bis(hydroxyaryl)phthalimidines

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Karnataka, India

Shivakumar Konda