Halogen-free flame-proofing agent

A halogen-free flame retardant for incorporation into a polymer matrix, wherein the flame retardant contains at least the following components A, B and C and optionally the component D:

• A. ammonium polyphosphate(s) and/or derivatives thereof,
• B. an oligomer or polymer of a 1,3,5 -triazine derivative, or mixtures of several thereof, having the general formula
• wherein
• X is a morpholino residue, a piperidino residue or a group derived from piperazine,
• Y is a divalent group derived from piperazine and
• n is a whole number greater than 1,
• C. zinc pyrophosphate,
• D. precondensed melamine derivatives, melamine salts and adducts, ethylenediamine phosphate, piperazine phosphate, piperazine polyphosphate, 1,3,5-trihydroxyethyl isocyanurate, 1,3,5-triglycidyl isocyanurate and triallyl isocyanurate,
• wherein the weight ratio of the component A to the component B is from 10:1 to 1:1 and the components A and B together make up 60 to 99 wt. % and the components C and D together make up 1 to 40 wt. % of the total weight of the components A, B, C and D.