Compositions with modified impact resistance

polymerizable composition comprising i) at least one benzoxazine compound and ii) at least one oligomeric or polymeric polyether urethane group, including one or structural maselementos of general formula (I), where n is a number 5-10000, each radical Ra in each repeating unit represents a divalent independenciade other linking group comprising 1 to 100 carbon atoms, each radical X 'in repeated cadaunidad is chosen independently of the other -O-, -S -, -NH- or a carboxyl group of general laformula - (C> = O) O-, so that the C atom of the carboxyl group is always connected to the residue a, each Y in each repeating unit is chosen independently of the other from -OH, -SH and -NH2 and cadaradical A in each repeating unit is independently selected from others among K or L, where K represents unradical divalent aromatic dihydroxy compounds after removing both hydroxyl groups and L unradical divalent polyethers after removing two terminal hydroxyl groups, with the proviso that the total number of all residues A in the oligomeric or polymeric free polyether urethane degrupos, 20 to 80% of all radicals A represent K and 20 to 80% of all radicals Arepresenten L.