The results of studies aimed at determining the structural, thermophysical, thermal and deformation-strength properties of polymer composite film materials based on secondary polypropylene modified with styrene-ethylene-butylene-styrene rubber when processed through a melt are presented. According to the developed compositions of a wide range of filling the matrix of secondary polypropylene with styrene-ethylene-butylene-styrene rubber from 1 to 10% by weight, that extrusion processing improves the technological compatibility of polymer systems, which affects the improvement of the complex of deformation and strength properties, wherein the tensile stress increases by 9% to 7% by weight of styrene-ethylene-butylene-styrene rubber in blends with secondary polypropylene due to a more uniform distribution of the former; as well as tensile elongation by 13% to 10% by weight of styrene-ethylene-butylene-styrene rubber in mixtures with secondary polypropylene due to their elasticisation. A positive effect was noted, which is manifested when determining thermal and thermophysical properties, indicating the formation of a single-phase nature of the mixture, affecting the temperature conditions of processing mixed compositions of secondary polypropylene filled with styrene-ethylene-butylene-styrene rubber, which affects the increase in the productivity of extrusion equipment and energy savings for their production. Extrusion processing of secondary polypropylene and styrene-ethylene-butylene-styrene rubber into film composites has been shown to be characterized by physical, rather than chemical or other type of interaction, which is manifested in the absence of absorption band peaks characteristic of styrene-ethylene-butylene-styrene rubber polar groups, which are absent in determining the chemical composition of film compositions by IR-spectroscopy. Thus, the developed composite compositions of film compositions based on secondary polypropylene modified with styrene-ethylene-butylene-styrene rubber can be recommended for practical use in the manufacture of multifunctional products.

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