| abstract |
A flame-retardant resin composition comprises a base resin (A), such as a polyester, polyamide or polycarbonate resin, and an organophosphorus compound (B) having at least one of the following formulas (I), (II) and (III): where A is selected from O, S, SO 2 , a single bond, alkyl, and -CH 2 - P 1 ; - P 1 is a phosphorus -containing group of the formula: R 1 and R 2 are the same or different and each is selected from H, O-alkyl, O-aryl, alkyl, aryl, and OM; R 3 is H or alkyl; M = Na, K, Zn, Al, Ca; a is an integer from O to 4, provided that a is at least 1 unit for each polymer chain; n is an integer from 1 to 100,000 and m is an integer from 0 to 100,000. |