MULTILAYER FILM STRUCTURES FOR USE IN THE PRODUCTION OF BANKNOTES OR THE LIKE

摘要

A laminated multi-layer film substrate comprises layers (a) and (b) each comprising at least 50 wt. % HDPE with density of at least 0.94 and oriented in 1 direction at least 3 times more than in the direction normal to the first and laminated so that the directions of major orientation are aligned. - Pref., both (a) and (b) comprise propylene polymer skin(s), pref. on both the inner and outer sides, and pref. comprising 10-20 wt. % LDPE. (b) is thermally laminated to (a). A laminating adhesive (c), pref. LDPE and/or LLDPE is used between (a) and (b), pref. with a primer between (a)/(b) and (c), the latter esp. being of ABA construction with a core layer (B) of LLDPE and layers (A) of LDPE. The substrate pref. further comprises a security device (d) between (a) and (b), esp. between the primer coatings on the inner sides of (a) and (b).