Method for preparing cyclic polycarbonate oligomer from bischloroformate composition Patent #: 4616077
ApplicationNo. 06/913908 filed on 10/01/1986
US Classes:528/370, FROM REACTANT HAVING A HALOGEN ATOM OR OXYGEN SINGLE BONDED TO A CARBONYL GROUP, E.G., HALO-C(=O)-, -O-C(=O)-O, ETC.528/196, With reactant having halo-C(=O)-halo, halo-C(=O)-O-, or -O-C(=O)-O- group528/198, Polymerizing in the presence of a specified material other than a reactant and other than Group IA or Group IIA material as sole metal atom528/199, Material is a nitrogen-containing compound528/371Polymerizing in the presence of a specified material other than a reactant
ExaminersPrimary: Anderson, Harold D.
Attorney, Agent or Firm
International ClassesC08G 64/04 (20060101)
C08G 64/02 (20060101)
C08G 64/28 (20060101)
C08G 64/00 (20060101)
C08G 75/00 (20060101)
C08G 75/28 (20060101)
AbstractPolycyclic polycarbonate (or thiol analog) oligomers are prepared from a mixture of at least one bishaloformate with at least one tetraphenol, or thio analogs thereof. Such mixture may also contain at least one dihydroxy or dimercapto compound. The oligomers are formed by the reaction of such mixtures with alkali metal hydroxides and various amines. The polycyclic oligomer mixtures may be converted to crosslinked polycarbonates or their thiol analogs.