Process for the polymerization of cyclic...

Details Process for the polymerization of cyclic... Process for the polymerization of cyclic...

C - Chemistry, Metallurgy

01

B

23/77

C01B 21/097 (2006.01) C01B 21/098 (2006.01)

Patent

CA 1120689

ABSTRACT OF THE DISCLOSURE: Linear polydihalophosphazene polymers which are substantially free of gel are prepared by thermally poly- merizing a cyclic polyhalophosphazene represented by the formula (NPX2)3, wherein X is fluorine, chlorine or bromine in the presence of a catalyst which comprises the reaction product of a boron trihalide compound with an oxygenated phosphorus compound. In addition to producing substantially gel free polymers, the catalyst composition of the process of the invention permits improved control of molecular weight, lower polymerization temperature, high rates of conversion of (NPCl2)3 to (NPCl2)n and provides for more readily processible and derivatizable polymers.

358561

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