Patent ID: 7622517

Claim:
A flame retardant cellulose containing material comprising a phosphorus-containing flame retardant formulation comprising from 0.01 to 99% by weight of a cellulose containing material from 0.1 to 99% by weight of at least one dicyandiamide-formaldehyde resin and from 0.1 to 99% by weight of at least one phosphorus-containing flame retardant, wherein the at least one phosphorus-containing flame retardant is a a diphosphinic salt of the formula (II), a polymer of the diphosphinic salt or a mixture thereof wherein R 1 and R 2 are identical or different and are C 1 -C 6 -alkyl, linear or branched, or aryl; R 3 is C 1 -C 10 -alkylene, linear or branched, C 6 -C 10 -arylene, -alkylarylene, or -arylalkylene; M is Mg, Ca, Al, Sb, Sn, Ge, Ti, Fe, Zr, Ce, Bi, Sr, Mn, Li or a protonated nitrogen base; n is from 1 to 4; x is from 1 to 4.