Process for producing phosphazene fire retardant

Details Process for producing phosphazene fire retardant Process for producing phosphazene fire retardant

1976-01-26

1978-03-28

Griffin, Ronald W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

8116R, 260DIG24, 536 60, 536 61, C08B 1600, D06M 1326, D06M 1500

Patent

active

040815935

ABSTRACT:
A process for producing fire retardant phosphonitrilate polymers by reacting phosphonitrilic halide with a hydroxyl compound such as an aliphatic or aromatic alcohol at not more than about 40.degree. C in the presence of an acid acceptor, such as pyridine, under conditions such that a relatively low concentration of the hydroxyl compound is present during the initial 1/2 to 3 hours of the reaction and the reaction conditions are maintained at from 20.degree.-50.degree. C for a period of 1/2 to 120 hours and, optionally, further heating the reaction mixture to a temperature of 40.degree.-80.degree. C for 1/2 to 81/2 hours. The phosphonitrilate polymers are suitable for fire retarding cellulosic materials such as regenerated cellulose, rayon and the like.

REFERENCES:
patent: 2909446 (1959-10-01), Redfarn
patent: 3869294 (1975-03-01), Lanier et al.

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