Process of preparing a flame-retardant polyurethane and product produced therefrom

Claim 1

A process for preparing a flame-retarding urethane polymer, which consists essentially in co-polymerizing a flame-retarding quantity of a compound of the formula ##STR8## in which each of X 1 , X 2 and X 3 is hydrogen, halogen, alkyl of up to 6 carbon atoms, --Y--P(O)(OR)(OR' ) or --Y--OH, wherein Y is (1) alkylene, (2) alkyl-substituted alkylene, (3) halogen-substituted alkylene wherein each of said alkyl and said alkylene contains from 1 to 6 carbon atoms; or (4) polyoxyalkylene in which each oxyalkylene unit contains 1 to 3 carbon atoms and wherein said polyoxyalkylene contains 2 to 4 of said oxyalkylene units; wherein each of R and R' is phenyl, alkyl or cycloalkyl wherein said alkyl and said cycloalkyl contain 1 to 6 carbon atoms, wherein each of said phenyl, alkyl or cycloalkyl is unsubstituted or substituted by at least one halogen atom, and wherein the Y group is bonded to both the ring nitrogen atom and the phosphonate phosphorus atom via a carbon atom; and in which at least one of said X 1 , X 2 or X 3 is --Y--P(O)(OR)(OR' ) and at least one of said X 1 , X 2 or X 3 is ----OH, with a copolymerizable organic monomer having a functional isocyanate group reactive therewith.