FIELD: polymer production.
SUBSTANCE: invention provides compositions for manufacturing air-permeable films showing elevated mechanical strength and microporosity. Bimodal polyethylene composition comprises: low-molecular weight ethylene homopolymer or copolymer of ethylene with one or more C4-C10-α-olefins, particulate filler (calcium carbonate), optionally olefin-based polymer (propylene/ethylene copolymer, polypropylene). Composition is characterized by melt flow rate 0.1 to 4.0 g/10 min and density 918 to 935 kg/m3. Films show very high water steam permeation velocity exceeding 3000 g/m3/24 h. Composition can be processed into thin films with low surface density: 25 g/m2 or below.
EFFECT: expanded technological possibilities and choice of air-permeable films.
20 cl, 2 tbl, 10 ex
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