Clear to colored security film

Details Clear to colored security film Clear to colored security film

1998-01-13

2000-04-04

Krynski, William

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428141, 4284111, 428500, 428913, B32B 702

Patent

active

060458941

ABSTRACT:
A multilayer film including multiple polymeric layers designed and made to enable the film to reflect light in the near infrared (IR) portion of the visible spectrum. Depending on the amount and range of red light that is reflected, the film of the present invention appears under certain conditions to exhibit a visible color, commonly cyan. The film appears to be substantially clear when viewed against a diffuse white background from approximately a zero degree observation angle, and appears to be cyan when viewed against that background from an observation angle that is greater than a predetermined shift angle.

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