Novel flame retarding compounds

A compound of formula I

• where
• R is hydrogen or methyl,
• G1 and G2 are independently alkyl of 1 to 4 carbon atoms or are together pentamethylene,
• x, y and z are each independently greater than or equal to 1,
• L is independently of each other a direct bond or a hydrocarbylene group,
• Z1 is hydrogen or hydrocarbyl, or is —OR1, —OCOR1, —COOR1, —CONR1R2, —NR1COR2, —COR1 or —NR1R2,
• R1 and R2 are independently of each other hydrogen or hydrocarbyl, or R1 and R2 together form a hydrocarbylene group,
• E is oxyl, hydroxyl, alkoxy, cycloalkoxy, aralkoxy, aryloxy, —O—CO-OG, —O—Si(G)3, or —O—CH2—OG where G is selected from the group consisting of hydrogen, an aliphatic, araliphatic and aromatic moiety;
• or E is —O-T-(OH)b,
• T is a straight or branched chain alkylene of 1 to 18 carbon atoms, cycloalkylene of 5 to 18 carbon atoms, cycloalkenylene of 5 to 18 carbon atoms, a straight or branched chain alkylene of 1 to 4 carbon atoms substituted by phenyl or by phenyl substituted by one or two alkyl groups of 1 to 4 carbon atoms,
• b is 1, 2 or 3 with the proviso that b cannot exceed the number of carbon atoms in T, and when b is 2 or 3, each hydroxyl group is attached to a different carbon atoms of T, and
• FRM is independently of each other an organohalogen or an organophosphorus flame retardant moiety.