Patent ID: 7691929

Claim:
A flame retardant composition, which comprises (a) a polyolefin substrate, and (b) at least one compound of formula (I) R 4 R 3 R 2 C—Z 1 —Z 2 —Z 3 (R 2 ) r R 3 R 4 (I) wherein Z 1 and Z 2 are both NR 1 and Z 3 is C or N; r is 0, when Z 3 is N, and r is 1, when Z 3 is C; the two R 1 's form together a bond or each R 1 is independently H or forms a bond together with R 2 present at the adjacent C-atom or, respectively, Z 3 ; each R 2 independently forms a bond or is a monovalent radical as defined for R 3 and R 4 below; each R 3 is independently and each R 4 is independently a monovalent radical selected from H, optionally substituted alkyl and optionally substituted cycloalkyl; or at one or both of the C-atom and Z 3 , as given in the above formula (I), R 3 and R 4 form together with said C-atom or, respectively Z 3 , wherein they are attached to, an optionally substituted, saturated, partially saturated or aromatic, mono- or polycyclic ring system of 5 to 20 carbons; and R 2 is a monovalent radical as defined for R 3 and R 4 above, or forms a bond between the C-atom and Z 1 or, respectively, between Z 3 and Z 2 , or forms a bond in the ring system formed by R 3 and R 4 between said C-atom or, respectively, Z 3 , and a ring atom adjacent thereto; or Z 3 forms together with R 2 , if present, R 3 and R 4 , which are attached thereto, a group —R′ 5 ([Z 1 —Z 2 —R 6 —] k Z 1 —Z 2 —R 5 —H) t , wherein each R′ 5 and R 5 is independently alkylene, cycloalkylene, cycloalkylenealkylene or cycloalkylenealkylenecycloalkylene: each R 6 independently is alkylene, cycloalkylene, cycloalkylenealkylene or cycloalkylenealkylenecycloalkylene, each —Z 1 —Z 2 — are —NR 1 —NR 1 —, t is 1 or 2 and k is 0-3; each group or a moiety of a group defined as variants for R 3 , R 4 , R′ 5 and R 6 is optionally substituted independently with 1-3 alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl or arylalkyl; or Z 3 together with R 2 , if present, R 3 and R 4 , which are attached thereto, represent a linking group —R 8 — to form R 2 R 3 R 4 C—Z 1 —Z 2 —R 8 —[U] x which denotes a recurring structural unit of a polymer, wherein R 8 is a linking bond or alkylene, cycloalkylene, heterocyclylene or arylene; U is a or R′ is H or alkyl and x is 2-500; with the proviso that in the compound of formula (I) at least at one of the C-atom and Z 3 , as depicted in the above formula (I), R 3 and R 4 are independently other than H and R 2 is H or a bond.