TAMPER EVIDENT, TAMPER RESISTANT PACKAGING MATERIAL, PREPARATION AND USE

摘要

2067251 9109726 PCTABS00005 A multilayer optical interference film indicator useful as or in a protective or tamper evident, tamper resistant packaging material, offering visible evidence of strain of a selected extent or greater associated with an attempt at pampering or the like in the form of iridescence or interference colors, which comprises contiguous layers of two or more (12, 14) diverse thermoplastic materials of differing refractive indices, and wherein the yield point of at least one of the diverse materials has been at least equalled when the visible evidence is produced.