. . . "Preferred is a mixture of a first component comprising polypropylene, a hydrocarbon resin, styrol-butadiene polymer, paraffin wax and polypropylene as commercially available from the 3M company under the designation Jet-Melt 3748, and of a second component which enhances the flow characteristics and which consists of a wax with a significant content of branched-chain and cycloaliphatic hydrocarbon" .