Continental White Cap, Inc.

Howard D Iler

Daniel P Bialka

Bradley C Kiss

Ihab Hekal

In accordance with the present invention, an irreversible tamper evident system for a button closure is provided. The irreversible tamper evident system is provided by a color change system carried by the flexible button portion of the closure. The color change system comprises an indicator coating over a dark colored substrate coating. The indicator coat is preferably colored with a light colored transparent colorant such as an orange colored fluorescent dye. The indicator coat is preferably a liquid material which can be cured by evaporation, heat, UV irradiation or the like, to form a solid layer. When the substrate layer and indicator layer are in intimate contact, a first color is observed. Depending upon the relative colors used for this substrate and indicator layers, this first color can be a combination of the colors of the two layer or can be primarily the color of the substrate layer. However, when the layers become separated and the outer layer is spaced from the inner layer, a second color is observed which second color is primarily the color of the indicator coat.

Tamper evident closure

This relates to the provision of a vacuum identifying button of a conventional closure for containers with encapsulated microcapsules containing a suitable dye. While the button is in its depressed, concave configuration, a coating surrounding the microcapsules is cured and caused to bond to the microcapsules. When the button everts to project upwardly and have a convex configuration, the coating is tensioned causing the microcapsules to rupture and release the color forming dye materials thereof. If desired, the evidence of button flipping or tampering may merely be in the form of a colored area, such as a stripe. In a modification, the effected colored areas may be in a design to present a warning or message. For example, a simple message such as 'OPENED' may be effected.

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Wheaton, IL, United States of America

Howard D Iler