Patent ID: 6270610
Filing Date: 2001-08-07
Classification: B32B,B42D,Y10S,Y10T

Abstract:
A method for preparing an embossed, curl-resistant laminated multilayer film substrate for use in the production of banknotes, security papers and the like which comprises:i) laminating(a) a first layer having inner and outer sides, comprising at least about 50 weight percent of a high density polyethylene having a density of at least about 0.94, said first layer being oriented in the transverse direction (TD) to a degree which is at least three times greater than the degree of orientation present in the machine direction (MD) to(b) a second layer comprising inner and outer sides, comprising at least about 50 weight percent of a high density polyethylene having a density of at least about 0.94, said second layer being oriented in the transverse direction to a degree which is at least three times greater than the degree of orientation present in the machine direction, with a laminating adhesive resin which comprises a component selected from the group consisting of low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), said second layer being laminated in the film substrate so that said transverse direction of orientation of said second layer is substantially aligned with said transverse direction of orientation of said first layer, thereby forming an embossable substrate; andii) embossing said substrate.