Graft copolymers

Abstract

Graft copolymers are obtainable by a) reacting vinylaromatic compounds with conjugated dienes to form polymers A) which contain C.dbd.C double bonds, b) hydroformylating C.dbd.C double bonds present in the polymer A) in the presence of carbon monoxide, hydrogen and a hydroformylation catalyst to form a polymer B), c) isolating the partially or completely hydroformylated polymer B), d) carrying out a C--C-coupling reaction on the formyl groups of the polymer B) with incorporation of a vinylaromatic unit to form a polymer C) and e) reacting the polymer C) with vinylaromatic compounds in the presence of a metallocene catalyst system.

Dependencies are inferred from the claim text.