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| | Use of hydrogenated abietic acid as a chain terminator for the production of polycarbonates and polyester carbonates - ... |
 | | Thermoplastic aromatic polyestercarbonates prepared from diphenols, carbonate donors, reactive aromatic dicarboxylic acid derivatives, chain terminators and optionally branching agents by an interfacial, homogenous solution or melt transesterification process, which are chain terminated with hydrogenated abietic acid in quantities of 0.6 to 12 mole-%, based on diphenols. |
 | | However, the hydrogenated abietic acid may also be initially introduced together with the diphenols in the aqueous/alkaline phase at the beginning of the reaction or even in the form of a solution in an organic solvent during the phosgenation process. |
 | | Suitable organic solvents for dissolving the hydrogenated abietic acid and, optionally, for the branching agents and the chlorocarbonic acid esters are, for example, methylene chloride, chlorobenzene, acetone, acetonitrile and mixtures of these solvents, more particularly mixtures of methylene chloride and chlorobenzene. |
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