Patent ID: 6309619
Filing Date: 2001-10-30
Classification: C08G

Abstract:
A solid state method of preparing poly(dichlorophosphazene) comprising the steps of:combining, in a solid state and without the presence of a solvent, ammonium sulfate ((NH.sub.4).sub.2 SO.sub.4) with phosphorus pentachloride (PCl.sub.5) in a reaction container;heating said combined ammonium sulfate ((NH.sub.4).sub.2 SO.sub.4) and phosphorus pentachloride (PCl.sub.5) until a liquid monomer of P-trichloro-N-(dichlorophosphoryl)monophosphazene (Cl.sub.3 P.dbd.NP(O)Cl.sub.2) is formed; andbulk polymerizing said P-trichloro-N-(dichlorophosphoryl)monophosphazene (Cl.sub.3 P.dbd.NP(O)Cl.sub.2) liquid monomer by heating under an inert nitrogen atmosphere until an oxyphosphoryl trichloride is distilled off forming a polydichlorophosphazene ([Cl.sub.2 P.dbd.N].sub.n) in said container.