FIELD: chemistry.
SUBSTANCE: composition contains a multimodal polyethylene basic resin obtained during polymerisation of at least one of fractions (A) and (B) in the presence of a single-site catalyst (SSC) on a metal. The fraction (A) in the composition is an ethylene copolymer and fraction (B) is an ethylene homo- or copolymer. Fraction (A) has lower molecular weight than fraction (B). The basic resin has density lower than 940 kg/m3, melt flow rate (MFR2) at 190°C/2.16 kg from 0.001 to 10 g/10 min and the composition has bending modulus between 300 and 820 MPa.
EFFECT: polyethylene composition has good processability during production and flexibility which is sufficient for easy handling, and meets PE63 class requirements or higher for pressure.
13 cl, 1 tbl, 2 ex
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