BEDRUCKBARE UND BEIDSEITIG SIEGELBARE, BIAXIAL ORIENTIERTE OPAKE POLYOLEFIN-MEHRSCHICHTFOLIE, IHRE HERSTELLUNG UND IHRE VERWENDUNG.

摘要

The sheet (I) comprises: (A) base layer substantially of propylene polymer, contg. inorganic pigment; (B) surface layer substantially of polyolefin sealing material, contg. incorporated a polydialkylsiloxane (II) as lubricant and not corona-treated; (C) opposing surface layer substantially of polyolefin sealing material, having on outer surface a (II) as lubricant in relative coating at most 15 as measured by ESCA spectroscopy. Prepn. of (I) by coextruding through a flat nozzle melts corresp. to the individual layers, cooling to solidify coextruded sheet, biaxially stretching it lengthwise 4-7:1 and transversely 8-10:1, thermofixing, corona treating, and winding up, coating of (II) on outer surface being formed on contact of both sealing layers.