| abstract |
A sheet containing a base layer containing polycarbonate and a flame retardant,n wherein the flame retardant contains a compound of formula 1 nn n n n n n n n n n n n wherein n R 1 , R 2 , R 3 and R 4 , represents an optionally halogen-substituted C 1 -C 8 alkyl, C 5 -C 6 cycloalkyl, C 6 -C 10 aryl or C 7 -C 12 aralkyl, n R 5 and R 6 , represents a C 1 -C 4 alkyl, and n Y represents a C 1 -C 7 alkylidene, C 1 -C 7 alkylene, C 5 -C 12 cycloalkylidene, —O—, —S—, —SO—, —SO 2 —, —CO— or a residue of formula (2) or (3) n n n n n n n n n n n n n n n n wherein Z represents carbon andn nR 21 and R 22 can be selected for each Z individually and, represent hydrogen or C1-C6 alkyl, with the proviso that, on at least one Z atom, R 21 and R 22 are simultaneously alkyl and wherein the polycarbonate comprises a mixture of linear and branched polycarbonate and wherein the linear polycarbonate content is at least 40 wt. %, based on the total polycarbonate weight. |