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Abstract

Propylene polymers containing a matrix of a propylene homopolymer and a copolymer of propylene and other alkenes, wherein, during the separation of the propylene polymers according to tacticity and comonomer distribution of the polymer chains, by first dissolving the propylene polymers in boiling xylene, then cooling the solution at a cooling rate of 10.degree. C./h to 25.degree. C. and thereafter, increasing the temperature, separating the propylene polymers into fractions of different solubility, either one or more of the conditions that i) more than 20% by weight of the matrix remain undissolved on further heating to 112.degree. C. or ii) more than 8% by weight of the matrix remain undissolved on further heating to 117.degree. C. or iii) more than 1% by weight of the matrix remain undissolved on further heating to 122.degree. C. are fulfilled by the matrix which remains undissolved on heating the cooled propylene polymer solution to 80.degree. C., a process for the preparation of the propylene polymers, their use for the production of films, fibers or moldings and the films, fibers or moldings comprising these propylene polymers, are described.

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First Claim