Patent ID: 7572856

Claim:
Process for preparing a flame retardant polyamide compound comprising melt-mixing of a composition comprising at least a polyamide polymer having a weight-average molecular weight of at least 10.000 g/mol and a flame retardant, wherein the composition comprises an amount of 1-20 wt %, relative to the total weight of polyamide, of a polyamide oligomer having (1) a weight-average molecular weight of at most 7.500 g/mol, and (2) a lower melting point than the polyamide polymer, with the proviso that the composition that is melt-mixed does not consist of: i) 100 parts by weight of a polyamide polymer, 0.001-10 parts by weight of a polyamide oligomer with a molecular weight of 5000 or less and having hydrocarbon radicals with 5-30 carbons as the terminals, and 1-25 parts by weight of a triazine flame retardant; ii) 100 parts by weight of a polyamide-6, 6 polymer, 15 parts by weight of a polyamide oligomer with a molecular weight of 1000 and consisting of the condensation product of stearic acid, ethylenediamine, and sebacic acid, and 7 parts by weight of melamine cyanuric acid; or iii) 100 parts by weight of a polyamide-6 polymer, 0.5 parts by weight of polyamide oligomer with a molecular weight of 1200 and consisting of the condensation product of stearyl amine, ethylenediamine, and sebacic acid, and 27 parts by weight melamine cyanuric acid.