Tamper indicating tape and delaminating film therefore
First Claim
1. A light transmissive film derived from a composition comprising 50 to 85 parts per weight of a first copolymer comprising at least one moiety derived from at least one olefinic monomeric unit and 50 to 15 parts by weight of a second copolymer comprising at least one moiety derived from at least one vinyl alcohol monomeric unit and said second copolymer being sufficiently incompatible with said first copolymer to form two phases within said film, one of said phases being continuous.
1 Assignment
0 Petitions
Accused Products
Abstract
A tamper indicating film and tape for use with a package. The tape includes a delaminating film including pahse separated polymers. Indicia are applied to opposing major surfaces of the film indicative of 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 are perceptible. When the film is internally delaminated, obscuring one set of indicia and rendering the other set of indicia perceptible.
129 Citations
19 Claims
- 1. A light transmissive film derived from a composition comprising 50 to 85 parts per weight of a first copolymer comprising at least one moiety derived from at least one olefinic monomeric unit and 50 to 15 parts by weight of a second copolymer comprising at least one moiety derived from at least one vinyl alcohol monomeric unit and said second copolymer being sufficiently incompatible with said first copolymer to form two phases within said film, one of said phases being continuous.
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19. In combination:
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(a) a container having a first container part and a second container part for enclosing an opening in said container when secured together; and (b) tamper indicating tape for adhesively securing said first and said second container parts together to enclose said opening in said container, including a light transmissive film having a first major surface and an opposing second major surface, said film derived from a composition comprising 50 to 85 parts by weight of a first copolymer comprising at least one moeity derived from at least one olefinic monomer and 50 to 15 parts by weight of a second copolymer comprising at least one moeity derived from at least one vinyl alcohol monomer and said second copolymer being sufficiently incompatible with said first copolymer to form two phases within said film, one of said phases being continuous, first colored indicia printed on said first major surface of said film, second colored indicia printed on said second major surface of said film, said first and second indicia having contrasting colors, and adhesive means for adhering said film to said first and said second container parts with a bond strength greater than the delamination force of said film, said adhesive means being coated on said first major surface of said film opposite said second indicia having a color substantially identical with said second indicia whereby said second indicia are obscured when viewed against said adhesive means through said second major surface of said film; (c) whereby when said film is delaminated, said film becomes opaque so that said first indicia are obscured when viewed through said delaminated film, but said second indicia are perceptible over said delaminated opaque film to indicate separation of said container parts.
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Specification