Matte, biaxially oriented, multilayer polypropylene film of high shrinkage, process for the production thereof, and the use thereof

A multilayer polypropylene film of high shrinkage having at least one matte surface, comprising:

• at least one base layer which comprises a propylene polymer or a propylene polymer mixture;
• and at least one outer layer which comprises a mixture or a blend of two components I and II, wherein
• component I is selected from the group consisting of
• a propylene homopolymer,
• a copolymer of ethylene and propylene,
• a copolymer of ethylene and butylene,
• a copolymer of propylene and butylene,
• a copolymer of ethylene and another .alpha.-olefin having 5 to 10 carbon atoms,
• a copolymer of propylene and another .alpha.-olefin having 5 to 10 carbon atoms,
• a terpolymer of ethylene and propylene and butylene,
• a terpolymer of ethylene and propylene and another .alpha.-olefin having 5 to 10 carbon atoms, mixture or blends thereof and
• a blend of two or more of said homopolymers, copolymers and terpolymers, mixed with one or more of said homopolymers, copolymers and terpolymers,
• and
• component II is selected from the group consisting of an HDPE and a blend of two components A and B, where blend component A essentially comprises an HDPE and
• blend component B is selected from the group consisting of
• a propylene homopolymer,
• a copolymer of ethylene and propylene,
• a copolymer of ethylene and butylene,
• a copolymer of propylene and butylene,
• a copolymer of ethylene and another .alpha.-olefin having 5 to 10 carbon atoms,
• a copolymer of propylene and another .alpha.-olefin having 5 to 10 carbon atoms,
• a terpolymer of ethylene and propylene and butylene
• a terpolymer of ethylene and propylene and another .alpha.-olefin having 5 to 10 carbon atoms and
• mixtures or blends thereof,
• and the multilayer film has a longitudinal shrinkage of greater than about 20%, and a transverse shrinkage of greater than about 25%, both measured at 120.degree. C., and wherein said multilayer film is made by a process comprising the steps of coextruding the melts corresponding to the individual layers of the film through a flat-film die, taking the coextruded film off over a take-off roll whose temperature is between about 20.degree. and 100.degree. C., biaxially stretching the film at a longitudinal stretching ratio (S.sub.t) from about 4:1 to 9:1 and a transverse stretching ratio (S.sub.1) from about 6:1 to 10:1, heat-setting the biaxially stretched film, and subsequently winding the film up.