Patent ID: 8475934

Claim:
Flame-retardant timber materials comprising, as flame retardant, at least one tetraalkyl bisphosphate of the formula (I) in which R 1 , R 2 , R 3 , and R 4 are mutually independently a C 1 -C 8 -alkyl or C 1 -C 4 alkoxyethyl moiety, A is a straight-chain, branched and/or cyclic C 4 -C 20 -alkylene moiety, a —CH 2 —CH═CH—CH 2 — group, a —CH 2 —C≡C—CH 2 — group, a —CHR 5 —CHR 6 —(O—CHR 7 —CHR 8 ) a — group, in which a is a number from 1 to 5, a —CHR 5 —CHR 6 —S(O) b —CHR 7 —CHR 8 — group, in which b is a number from 0 to 2, or a —(CHR 5 —CHR 6 ) c —O—R 9 —O—(CHR 7 —CHR 8 ) d — group, in which c and d are mutually independently numbers from 1 to 5, R 5 , R 6 , R 7 , and R 8 are mutually independently H or methyl, R 9 is a —CH 2 —CH═CH—CH 2 — group, a —CH 2 —C≡C-CH 2 — group, a 1,2-phenylene moiety, a 1,3-phenylene moiety, a 1,4-phenylene moiety, a moiety of the general formula (II), a moiety of the general formula (III), a moiety of the general formula (IV), or a moiety of the formula —C(═O)—R 12 —C(═O)—, R 10 and R 11 are mutually independently H or C 1 -C 4 -alkyl, or R 10 and R 11 together are an optionally alkyl-substituted ring having from 4 to 8 carbon atoms, and R 12 is a straight-chain, branched and/or cyclic C 2 -C 8 -alkylene moiety, a 1,2-phenylene moiety, a 1,3-phenylene moiety, or a 1,4-phenylene moiety.