FIELD: chemistry.
SUBSTANCE: invention relates to polymer materials and relates to a composite film based on a propylene polymer, a method for production thereof and use thereof. Composite film is especially useful in the field of packaging materials for batteries, electronic products or food packaging materials. Composite film comprises at least two different layers: layer a and layer b, each containing at least one propylene polymer, and at least one of them contains impact-resistant propylene copolymer, which contains elastic fragments forming in composite film dispersed tape-like rubber phases arranged in parallel to each other wherein the average size of the transverse axes of the rubber phases is 20–200 nm, and the average value of the ratios of their sides is 5–20, wherein the composite film has a film turbidity of less than 7%.
EFFECT: invention enables to create a composite film having excellent impact strength, optical properties, has good stretching properties and/or good heat-sealing strength at lower heat-sealing temperatures and uniformity in thickness.
30 cl, 7 dwg, 9 tbl, 9 ex
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