Process for producing an aromatic polyesterpolycarbonate

C - Chemistry – Metallurgy – 08 – G

Patent

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402/174, 402/178

C08G 63/64 (2006.01)

Patent

CA 1156395

ABSTRACT OF THE DISCLOSURE A process for producing an aromatic polyesterpoly- carbonate, which comprises polycondensing (a) a dihy- droxydiaryl compound, (b) a terephthaloyl chloride and/or isophthaloyl chloride reactant, and (c) phosgene by an interfacial polymerization process in the presence of water, methylene chloride and an acid binding agent thereby preparing an aromatic polyesterpolycarbonate product containing structural units of the formula: Image ..... (I) wherein X is a divalent group, and the aromatic rings may be substituted, and structural units of the formula: Image .....(II) wherein X is a divalent group, and the aromatic rings may be substituted, said condensation reaction being characterized in that after at least 95% of the total -COC1 groups in the terephthaloyl chloride and/or isophthaloyl chloride and phosgene starting materials has reacted, a chloroformate compound or additional phosgene is added to the reaction mixture in an amount to bring the concentration of -COCl groups to a level of 10 to 1000 µeq/g relative to the total amount of the above starting materials to complete the reaction.

363216

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