| 摘要 |
The present invention relates to a semicrystalline propylene polymer composition prepared by polymerizing propylene, ethylene and/or C4-C18-1-alkenes, where at least 50 mol % of the monomer units present stem from the polymerization of propylene and at least 20% by weight of the propylene polymer composition is the result of a polymerization using metallocene catalysts, with a melting point TM of from 65 to 170° C., where the semicrystalline propylene polymer composition can be broken down into from 65 to 85% by weight of a principal component A, from 10 to 35% by weight of an ancillary component B and from 0 to 25% by weight of an ancillary component C, and where the proportions of components A, B and C are determined by carrying out TREF (temperature rising elution fractionation) in which that fraction of the propylene polymer composition which is soluble in xylene at (TM/2)+7.5° C. is firstly dissolved and separated off and then, as the temperature rises, at all of the higher temperatures 70° C., 75° C., 80° C., 85° C., 90° C., 94° C., 98° C., 102° C., 107° C., 112° C., 117° C., 122° C. and 125° C., the fractions soluble within the temperature range between this elution temperature and the preceding elution temperature are eluted, and the principal component A is formed by all of the fractions which are eluted at above (TM/2)+7.5° C. and have an average molar mass MN [sic] (number average)>=120,000 g/mol, the ancillary component B is formed by the fraction which is eluted at (TM/2)+7.5° C., and the ancillary component C is formed by all of the fractions which are eluted at above (TM/2)+7.5° C. and have an average molar mass Mn (number average)<120,000 g/mol. A process for preparing the semicrystalline propylene polymer composition is also described, as are the use of the semicrystalline propylene polymer composition for producing films, fibers or moldings, and the films, fibers and moldings made from this composition. |
