Interfacial polymerization, early research

Researchers at GE and Bayer independently developed commercially feasible synthetic processes for BPA-PC in the 1950s and began commercial production in the early 1960s. Bayer was awarded the U.S. patent for PC produced via the interfacial polymerization process and GE the U.S. patent for the melt transesterification process. However, until recently, the major part of BPA-PC was produced via the interfacial process. Further information on the history of PC development can be found in previously published reviews. 

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