Non-mechanically created iridescent film

摘要

The novel method can produce a grooved profile metalized polymeric film capable of generating a rainbow iridescent effect without mechanically embossing the film. The method calls for applying a thin uniform thickness coating layer of thermally deformable polymer composition on a thermally stable base layer. Process operating conditions are controlled to heat the composite coating layer surface effectively such that light diffraction-scale grooves of about 5,000-10,000 grooves/cm develop in the coating layer. The grooves are created by shocking the coating layer surface with a sudden burst of heat supplied by film metalization after coating layer application.

主权项

1. A method of producing a film that exhibits rainbow iridescence comprising the steps of
(A) providing a base layer of a polymer having a softening temperature above 200° C., (B) applying a coating layer of a coating polymer having a glass transition temperature in the range of about 30-55° C. in direct contact with one side of the base layer, and (C) depositing a metal layer in direct contact with the coating layer on a side opposite the base layer, in which the depositing step is effective to create a grooved surface profile on the coating layer having about 5,000-10,000 grooves per cm.