| abstract |
The invention relates to flame-retardant expandable polymers, in which a combination of at least one phosphorus compound as a flame retardant and at least one sulfur compound as an additional flame retardant or flame-retardant synergist is contained as a flame retardant system. According to the invention, the phosphorus compound is - elementary phosphorus and/or - at least one inorganic phosphorous compound and/or - at least one organic phosphorous compound of the following general formula (I) or (II), wherein the groups R 1 , R 2 , and R 3 mean organic or inorganic groups independently of each other, and the sulfur compound is - elementary sulfur and/or - at least one inorganic or organic sulfur compound or compound containing sulfur. |