Patent ID: 8691896

Claim:
A polymer foam with density in the range from 5 to 120 kg/m 3 , comprising a) a polymer component, comprising at least one styrene polymer, b) from 0.1 to 5 parts by weight (based on 100 parts by weight of component a)) of a flame retardant mixture, comprising b1) at least one phosphorus compound of the formula (I) having phosphorus content in the range from 5 to 80% by weight, based on the phosphorus compound, (X 1 ) s ═PR 1 R 2 R 3 (I) wherein R 1 is C 1 -C 16 -alkyl, C 1 -C 10 -hydroxyalkyl, C 2 -C 16 -alkenyl, C 1 -C 16 -alkoxy, C 2 -C 16 -alkenoxy, C 3 -C 10 -cycloalkyl, C 3 -C 10 -cycloalkoxy, C 6 -C 10 -aryl, C 6 -C 10 -aryloxy, C 6 -C 10 -aryl-C 1 -C 16 -alkyl, C 6 -C 10 -aryl-C 1 -C 16 -alkoxy, SR 9 , COR 10 , COOR 11 , or CONR 12 R 13 ; R 2 is C 6 -C 10 -aryl; R 3 is H, SH, SR 4 , OR 5 , or a —(Y 1 ) n —[P(═X 2 ) u R 6 —(Y 2 ) n ] m —P(═X 3 ) t R 7 R 8 group; X 1 , X 2 and X 3 are identical or different and, independently of one another, O or S; Y 1 and Y 2 are identical or different, being O or S; R 4 , R 5 , R 9 , R 10 , R 11 , R 12 , and R 13 are identical or different, being C 1 -C 12 -alkyl, C 3 -C 8 -cycloalkyl, which is optionally substituted with one or more C 1 -C 4 -alkyl groups as substituents, or being C 2 -C 12 -alkenyl, C 2 -C 12 -alkynyl, C 6 -C 10 -aryl, or C 6 -C 10 -aryl-C 1 -C 4 -alkyl; R 6 , R 7 , and R 8 are identical or different and, independently of one another, C 1 -C 16 -alkyl, C 2 -C 16 -alkenyl, C 1 -C 16 -alkoxy, C 2 -C 16 -alkenoxy, C 3 -C 10 -cycloalkyl, C 3 -C 10 -cycloalkoxy, C 6 -C 10 -aryl, C 6 -C 10 -aryloxy, C 6 -C 10 -aryl-C 1 -C 16 -alkyl, C 6 -C 10 -aryl-C 1 -C 16 -alkoxy, SR 9 , COR 10 , COOR 11 , or CONR 12 R 13 ; n is 0 or 1 if Y 1 and, respectively, Y 2 is O, and is 1, 2, 3, 4, 5, 6, 7, or 8 if Y 1 and, respectively, Y 2 is S; m is an integer from 0 to 100; s, t, and u are, independently of one another, 0 or 1; and b2) elemental sulfur.