According to Patents EP-40 05 31 and EP-40 05 32 it is proposed to treat the starch analogous to W090-05 161 by means of a high boiling plasticizing agent, such as glycerine, urea, or sorbitol, in order to obtain thermoplastically processable starch in order to subsequently mix it with ethylene acrylic acid and/or polyvinyl alcohol copolymers.