Process for the production of laminate systems from a low density polyethylene coating resin

Process for the production of laminate systems with improved bond strength by coating flexible substrates using, as the coating resin, low density polyethylene (LDPE) which has been prepared in autoclave reactors with virtually complete back mixing under pressures of 800 to 3,000 bars and in the presence of initiators which form free radicals, characterized in that a low density polyethylene which is obtained if

• (a) two autoclaves are connected in series such that all the reaction product of the first reactor is transferred to the second reactor,
• (b) a length-/diameter ratio (L/D) of 1:1 to 3:1 is chosen for each autoclave,
• (c) The monomer feed stream is distributed between the two reactors such that the monomer feed stream to the first reactor is the same as or greater than the monomer feed stream to the second reactor,
• (d) the reaction temperatures in the two autoclaves are adjusted such that the reaction temperature in the first reactor is lower than the reaction temperature in the second reactor,
• (e) the initiator chosen for the first reactor is the same as or different from the initiator chosen for the second reactor,
• and which has a density of 0.915 to 0.930 g/cm.sup.3 and a melt index (190.degree. C./2,16 kp) of 0.2 to 20 g/10 minutes is employed as the coating resin,
• and said flexible substrate is coated with a composition consisting essentially of said low density polyethylene.