CROSS REFERENCE TO RELATED APPLICATIONSSer. No. 964,751, filed Nov. 29, 1978, U.S. Pat. No. 4,204,072 --"TRIS(N-CARBALKOXYLAMINOMETHYL)PHOSPHINES"Ser. No. 964,853, filed Nov. 29, 1978, U.S. Pat. No. 4,171,448--"QUATERNARY PHOSPHONIUM SALTS BEARING CARBAMATE GROUPS"BACKGROUND OF THE INVENTION(1) Field of the InventionThis invention relates to novel tris(N-carbalkoxylaminomethyl)phosphine oxides and sulfides and to methods for preparing the same.(2) Description of the Prior ArtNowhere in the prior art do there exist tertiary phosphine oxides and sulfides containing carbamate groups attached to each of the phosphorus substituents through its nitrogen atom.Furthermore, the preparation and properties of such compounds, together with methods for their methylolation, and their application to cotton fabrics for the purpose of imparting flame retardant properties to the cotton, has not been known previously.SUMMARY AND OBJECTS OF THE INVENTIONThe instant invention discloses as new compounds tri...
