Partially crosslinked plastics materials of propylene copolymers

摘要

Partially crosslinked plastics materials having a melt flow index of from 0.1 to 100 g/10 min at 230 DEG C. and under a weight of 2.16 kg, containing a) a polymer of from 25 to 97% by weight of a propylene copolymer (I) which contains from 0.1 to 15% by weight of polymerized C2-C10-alk-1-enes and of from 3 to 75% by weight of a further propylene copolymer (II) which contains from 15 to 80% by weight of polymerized C2-C10-alk-1-enes and b) an organosilane compound of the following formula (I) A4-nSiRn (I) where the radicals A are identical or different and are each an acrylate or methacrylate or vinyl, the radicals R are identical or different and are each C1-C8-alkoxy or C1-C8-acetoxy and n is 1, 2 or 3, are obtainable by reacting the polymer a) with the organosilane compound b) in the presence of a free radical initiator and a condensation catalyst at from 180 to 280 DEG C. and from 1 to 100 bar and in the course of average residence times of the reaction mixture of from 0.2 to 10 minutes. The novel plastics materials have in particular improved processibility and thermoformability, a lower sealing temperature and better white fracture behavior.