Synthesis polyphosphazenes with controlled molecular weight and

Details Synthesis polyphosphazenes with controlled molecular weight and Synthesis polyphosphazenes with controlled molecular weight and

1997-08-22

1999-06-22

Hampton-Hightower, P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phosphorus-containing reactant

528 26, 528167, 528168, 528169, 528223, 528224, 528225, 528228, 528287, 528363, 528399, 525538, C08G 7902

Patent

active

059143886

ABSTRACT:
A process for the preparation of polyphosphazenes is provided that includes the cationic solution polymerization reaction of a phosphoranimine, using a main group or transition metal halide, or other appropriate halide salt, including a linear phosphazene salt of any chain length, or a preformed non-phosphazene polymer containing a main or transition metal chloride, as an initiator. In a preferred embodiment, triarmed-star polyphosphazenes having the formula N{RN(H)R'.sub.2 P--(N.dbd.PR'.sub.2).sub.n }.sub.3 are prepared via this method. Also, a methods for synthesis of the monomer Cl.sub.3 P.dbd.NSiMe.sub.3 and cyclic trimer N.sub.3 P.sub.3 X.sub.6 from the reactants N(SiR.sub.3).sub.3 and PX.sub.5 are also described.

REFERENCES:
patent: 5567783 (1996-10-01), Allcock et al.
patent: 5688888 (1997-11-01), Burkus, II et al.
patent: 5698664 (1997-12-01), Allcock et al.
patent: 5747604 (1998-05-01), Allcock et al.

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