1. AN ALKALI SOLUBLE POLYCARBONATE PREPARED BY THE REACTION OF, IN AN AQUEOUS MEDIUM AT A PH OF FROM ABOUT 10-11, (A) A MEMBER THE SOLE REACTIVE GROUPS OF WHICH ARE, UNDER THE CONDITIONS OF THE CONDENSATION REACTION, THE PHENYL HYDROXY GROUPS, SAID MEMBER BEING SELECTED FROM THE CLASS CONSISTING OF ADIPHENOLIC ACID AND A MIXTURE OF BISPHENOLS OF WHICH AT LEAST 5 MOLS PERCENT IS A DIPHENOLIC ACID, SAID DIPHENOLIC ACID BEING OF THE FORMULA