C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
400/5040
C08J 5/18 (2006.01) B65D 55/02 (2006.01) B65D 55/06 (2006.01) C08L 23/14 (2006.01) G09F 3/02 (2006.01) G09F 3/03 (2006.01)
Patent
CA 1339287
The present invention relates to delaminating film and a tamper indicating tape made from same for use with a package to indicate opening of the package. Delaminating films typically include two or more layers of polymeric materials, bonded together either by heat lamination, by coextrusion, or by means of an adhesive layer. Delamination of these composite films by separation of the various layers from each other provides indication of tampering. However, lamination or coextrusion of multiple polymeric layers increases the material expense of the film and tape and requires complex manufacturing techniques. The present invention provides a tamper indicating film and tape for use with a package. The tape includes a delaminating film including phase separated polymers. Indicia are applied to opposing major surfaces of the film to indicate different conditions of the tape. The film is adhesively applied to secure container parts together and enclose an opening in the container. When applied, only one of the indicia is perceptible. When the film is internally delaminated, one set of indicia is obscured and the other set of indicia is rendered perceptible.
601735
Rivera Raymond R.
Vanvleet Stephen B.
Wilson Shari J.
Smart & Biggar
The Minnesota Mining & Manufacturing Company
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