FIELD: chemistry.
SUBSTANCE: claimed invention can be applied in chemistry of polymers and relates to phosphorus-sulfur compound, which is represented by structure 
and method of obtaining foamed polymer, which includes formation of molten mixture of combustible thermoplastic or thermoreactive polymer, at least, one foaming agent and claimed phosphorus-sulfur compound under pressure with the following extrusion of molten mixture.
EFFECT: claimed is novel effective fire-protective additive for polymers and novel effective method of obtaining foamed polymer.
2 cl, 38 ex
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