C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/77
C01B 21/097 (2006.01) C01B 21/098 (2006.01)
Patent
CA 1088273
ABSTRACT In a process for the production of solutions of essentially linear polydihalophosphazenes suitable for the formation of completely substituted, halogen-free polydihalophosphazene derivatives, in which lower molecular weight cyclic dihalophosphazenes represented by the general formula (NPX2)n wherein X represents halogen selected from the group consisting of Cl, Br and I and n represents integers between about 3 and about 7, are thermally polymerized in the presence of a Lewis acid compound catalyst to form a higher molecular weight essentially linear dihalopolyphosphazene of the formula (NPX2)m wherein m represents integers between about 10 and about 50,000 and said linear polydi- halophosphazene exhibits a tendency to form a gelled product when formed in the presence of said Lewis acid compound, which gelled product must be dissolved, prior to being derivatized by a reaction with alkoxy or aryloxy groups in which substantially all of the halogen atoms attached to the P atoms in the phosphazene are removed, the improvement which consists in dissolving said gelled linear polymer product in a hydrocarbon solvent mixture containing up to about 10.0% weight of an oxygen-containing solubilizing diluent selected from the group consisting of aliphatic alcohols, ketones, aldehydes, esters, ethers and polyethers and mixtures thereof prior to derivatizing said polydihalophosphazene in solution. The process allows the dispersing of gelled polyhalophosphazene to permit its use in the subsequent preparation of derivatives and facilitates clean-out and rinsing of equipment.
259563
Snyder Dennis L.
Stayer Mark L. Jr.
Borden Ladner Gervais Llp
Firestone Tire & Rubber Company (the)
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