THERMOPLASTIC MOLDING MATERIALS WITH IMPROVED INITIAL STRENGTH AND COLD TOUGHNESS BASED ON A THERMOPLASTIC POLYURETHANE-COPOLYMERISATE MIXTURE, METHOD FOR THEIR PRODUCTION AND THEIR USE.

摘要

The invention relates to thermoplastic moulding compositions of improved green strength and low-temperature impact strength based on a TPU copolymer mixture and containing, based on 100 parts by weight, … …  A) from 20 to 90 parts by weight of at least one thermoplastic polyurethane, …  B) from 1 to 40 parts by weight of at least one rubber-elastic graft copolymer built up from … …  B1) a graft base comprising a rubber-elastic polymer having a glass transition temperature of below -20 DEG C based on butadiene or C1-C10-acrylates, and optionally a crosslinking agent, and …  B2) a graft shell prepared by one-step or multistep copolymerisation of styrene, alpha -methylstyrene, acrylonitrile, methacrylonitrile and methyl methacrylate or mixtures of at least two of said monomers, … …  C) from 5 to 75 parts by weight of at least one copolymer of … …  C1) from 55 to 90% by weight of alpha -methylstyrene and …  C2) from 10 to 45% by weight of acrylonitrile or methacrylonitrile or mixtures thereof, … …  D) from 0.1 to 5 parts by weight of at least one copolymer of … …  D1) from 60 to 99% by weight of styrene and …  D2) from 1 to 40% by weight of at least one olefinically unsaturated monomer containing at least one carboxyl, anhydride, tert-butyl ester, hydroxyl or amino group, and … …  E) from 0 to 60 parts by weight of at least one reinforcing filler. … …??The moulding compositions can be prepared by melting together the starting components and are preferably used for the production of injection mouldings.