Sabic Innovative Plastics IP B.v.

Rajshekhar Basale

Gurram Kishan

Balakrishnan Ganesan

Ravindra Vikram Singh

Pradeep Jeevaji Nadkarni

Venkata Rama Narayanan Ganapathy Bhotla

Suresh Shanmugam

Swaminathan Shubashree

Pushpa Narayanan

Venkata Rama Narayanan Ganapathy Bholta

Surendra Kulkarni

Hyacinth Mary Bastian

Disclosed herein is a method comprising reacting a phenolphthalein material and a primary hydrocarbyl amine in the presence of an acid catalyst to form a reaction mixture comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, wherein the phenolphthalein material comprises greater than or equal to 99 weight percent phenolphthalein, based on the total weight of the phenolphthalein material; quenching the reaction mixture and treating the quenched reaction mixture to obtain a first solid. The first solid is purified by a combination of techniques to produce a solid comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine with sufficient purity to be used as a monomer in the synthesis of clear polymers.

Methods for producing and purifying 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine monomers and polycarbonates derived therefrom

Disclosed herein is a method comprising reacting a phenolphthalein material and a primary hydrocarbyl amine in the presence of an acid catalyst to form a reaction mixture comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, wherein the phenolphthalein material comprises greater than or equal to 95 weight percent phenolphthalein, based on the total weight of phenolphthalein material; quenching the reaction mixture and treating the quenched reaction mixture to obtain a first solid. The first solid is then triturated with a trituration solvent and washed to obtain a second solid, wherein the second solid comprises greater than or equal to 97 weight percent 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, based on the total weight of the second solid. The second solid may be polymerized to form a polycarbonate.

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Bengaluru, India

Rajshekhar Basale