Title: Polymeric phosphazenes

Abstract: A novel process consisting of reacting a phosphonitrilic chloride with an alcohol or alkoxide to 12 carbon atoms to produce a partially esterified phosphonitrilic chloride, removing impurities from the chloroester and heating the ester to form a condensed polymeric phosphazene with P-O-P oxygen linkages. This new class of polymer phosphazenes, with P-O-P oxygen linkages, is unusually efficacious in rendering rayon flame-retardant.

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Inventors: Franko-Filipasic, Borivoj Richard (Morrisville, PA, US)
Orwoll, Edward Francis (Langhorne, PA, US)
Start, John Francis (Mercerville, NJ, US)

Application Number: 442480
Filing Date: 1974-02-14
Publication_date: 1976-11-09
Assignee: FMC Corporation (Philadelphia, PA)
Primary Class(es): 106/18.16 106/166.2, 106/200.2, 106/200.3, 558/76, 558/80
Other Classes:
US Patent Ref:

2909446	Oct, 1959	Redfarn	117/138.
3012908	Dec, 1961	Bilger	106/15.
3193571	Jul, 1965	Bilger	117/137.
3206494	Sep, 1965	Lund et al.	106/15.
3370020	Feb, 1968	Allcock	260/30.
3505087	Apr, 1970	Godfrey	106/15.
3532526	Oct, 1970	Godfrey	106/15.

Other Refs: 1,904,427

Aug, 1970	DT

Other References: B369,221, Feb. 1976, Kao, 260/927 N.