Process for the preparation of flame-resistant polycarbonate moulding compositions containing tetrafluoroethylene polymers
Patent 4649168 Issued on March 10, 1987. Estimated Expiration Date: 
November 13, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 13, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesTransparent to translucent flame-retardant polycarbonate composition Flame-resistant polymer mixtures Flame retardant non-dripping polycarbonate compositions exhibiting improved thick section impact Patent #: 4473685 InventorsApplicationNo. 06/797531 filed on 11/13/1985US Classes:524/130, Phosphorus bonded to three chalcogen atoms and having only one P-C linkage524/132, Aryl group524/165, Halogen524/166, Metal524/405, Boron directly bonded to oxygen524/413, Transition metal other than Group VIII DNRM (i.e., Sc, Ti, Mn, Cu, Y, Zr, Tc, Hf, Re)524/415, Atom other than P, O, H, or a metal524/417, Phosphorus atom directly bonded to four oxygen atoms, e.g., phosphoric acid, etc.524/437, Aluminum DNRM524/438, Nonmetal compound DNRM524/508, With solid polymer derived from at least one reactant wherein at least one of the reactants forming the solid polymer is a phenol or inorganic phenolate; or with SPFI or SICP derived from phenol or inorganic phenolate wherein at least one of the necessary reactants is saturated525/67With solid polymer derived from at least one hal-C(=O)-hal, O-C(=O)-O or hal-C(=O)-O- reactant wherein at least one of the reactants forming the solid polymer is saturated; or with SPFI wherein at least one of the necessary ingredients is a hal-C(=O)-hal, O-C(=O)-O, or hal-C(=O)-O containing reactant or reaction product thereof; or with a SICP containing a hal-C(=O)- or O-C(=O)-O- groupExaminersPrimary: Pertilla, Theodore E.Attorney, Agent or FirmInternational ClassesC08L 69/00 (20060101)C08K 5/00 (20060101) Foreign Application Priority Data1984-11-20 DEAbstractThe present invention relates to a process for the preparation of flame-resistant polycarbonate moulding compositions, which is characterized in that, besides the addition of alkali metal salts, there is incorporation of tetrafluoroethylene polymers as an intimate mixture with halogen-free graft polymers, these intimate mixtures being prepared by coagulation of the appropriate emulsion mixtures, and to the polycarbonate moulding compositions obtainable by the process according to the invention. | |
