Loading patent…
AssigneeThe United States of America as represented by the Secretary of Agriculture
InventorsJohn V. Beninate, Donald J. Daigle, George L. Drake, Wilson A. Reeves, Darrell J. Donaldson
Estimating the term…
Methylol phosphines, methylol phosphines in combination with amine or amido compounds or water soluble adducts of these methylol phosphines and amides or amines when mixed and reacted with mono, di or polyisocyanates wherein the isocyanate groups are attached to carbon atoms are particularly valuable for the preparation of thermosetting flame resistant polymers. The polymers which are produced are crosslinked phosphorus and nitrogen containing polymers in which the reoccurring structure units each contain a phosphorus atom, that is a component of a radical of the group tris(methylene)-phosphine (--CH.sub.2).sub.3 P and is linkd to at least one isocyanate radical by connecting urethane structure. The polymer forming solutions are also valuable for the preparation of flame-, glow-, wrinkle- and shrink-resistant textiles by impregnating fabrics with these solutions and causing reaction and polymer formation by application of heat.
The polymers produced by mixing toluenediisocyanate and a soluble methylol phosphine adduct, prepared by reacting tris(hydroxymethyl)phosphine with an essentially monomeric amide or amine which adduct contains structures of the group consisting of (HOCH.sub.2).sub.m P(CH.sub.2 N ).sub.n where m and n are integers of one or two and the sum of m + n is 3, in solution with dimethylformamide and polymerizing about from 28.degree. C to about 150.degree. C for periods of time ranging about from 24 hours to about 3 minutes, the longer periods of time being used in conjunction with the lower temperatures, and the shorter periods of time with the higher temperatures.
Dependencies are inferred from the claim text.