POLYPROPYLENFASERN FÜR DIE HERSTELLUNG VON THERMISCH VERFESTIGTEN VLIESSTOFFEN

摘要

A fibre for thermal bonding comprising a propylene polymer composition having an MFR value from 4 to 50 g/10 min. The said composition is selected from (i) a crystalline propylene random copolymer or polymer composition containing at least 0.8% by weight of ethylene and optionally one or more C₄-C₁₀ alpha-olefins and having a melting temperature of 155° C. or higher, a content of fraction soluble in xylene at room temperature lower than 5 wt %, a value of the ratio of the polymer fraction collected at the temperature range from 25° to 95° C. by TREF with xylene to the xylene soluble fraction, higher than 8; and (ii) a crystalline propylene polymer composition having a melting temperature of 153° C. or higher, a content of fraction soluble in xylene at room temperature lower than 10 wt % and containing at least 0.64 wt % of ethylene and/or C₄-C₁₀ alpha-olefin recurring unit and comprising (I) 20-80 wt % of a crystalline propylene homopolymer and/or crystalline propylene random copolymer containing up to 1.5% by weight of ethylene and/or C₄-C₁₀ alpha-olefin and (II) 20-80 wt % of a crystalline random copolymer of propylene with ethylene or a C₄-C₁₀ alpha-olefin. A polymer composition having an MFR value from 4 to 50 g/10 min, an ethylene content of at least 0.64 wt % and comprising (A) 20-80 wt % of a crystalline propylene homopolymer or crystalline propylene random copolymer containing up to 1.5 wt % of ethylene and/or C₄-C₁₀ alpha-olefin and (B) 20-80 wt % of a crystalline random copolymer of propylene with higher than 5 to 9 wt % of ethylene. Non-woven fabrics that are prepared with the said fibres are useful for hygienic applications.