Adhesive tape
AssigneeHoechst Aktiengesellschaft
InventorsPeter Hammerschmidt, Gunther Crass
Life of this patent
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Abstract
An adhesive tape is described, which is destroyed by delamination upon removal from a substrate but which may be unwound from a supply roll without destruction. The adhesive tape comprises an inner layer of a polyolefin having 2 to 6 carbon atoms containing in a finely distributed form solid organic particles with a size of from about 0.2 to 20 microns and polyolefin cover layers on both sides of the inner layer, one of which is coated with an adhesive and the other with a release coat.
Claims13
A multilayer, biaxially oriented, delaminatable adhesive security tape, comprising:
- an inner layer comprising a polymer or copolymer of an alpha-olefin having 2 to 6 carbon atoms, said layer including a plurality of solid particles having a dimension between about 0.2 and 20 microns in finely distributed form, in a quantity of from about 3 to 20% by weight with respect to the total weight of the polymer forming the inner layer, and a plurality of microcracks and small pores of vacuoles at the boundary zone between said alpha-olefin polymer or copolymer and said solid particles;
- on both sides of said inner layer, a cover layer comprising a polymer or copolymer of an alpha-olefin having 2 to 4 carbon atoms;
- an adhesive layer on the side of one of said cover layers facing away from the inner layer;
- and
- an adhesive repellent layer on the other cover layer, again on its side facing away from the inner layer.
A multilayer, biaxially oriented, delaminatable adhesive security tape, comprising:
- an inner layer comprising a polymer or copolymer of an alpha-olefin having 2 to 6 carbon atoms, said layer including a plurality of solid particles having a dimension between about 0.2 and 20 microns in finely distributed form, in a quantity of from about 3 to 20% by weight with respect to the total weight of the polymer forming the inner layer, and a plurality of microcracks and small pores or vacuoles at the boundary zone between said alpha-olefin polymer or copolymer and said solid particles;
- on both sides of said inner layer, a cover layer comprising a polymer or copolymer of an alpha-olefin having 2 to 4 carbon atoms;
- an adhesive layer on the side of one of said cover layers facing away from the inner layer;
- and
- an adhesive repellent layer on the other cover layer, again on its side facing away from the inner layer, wherein the tape is delaminatable along a plane defined by said inner layer.
Dependencies are inferred from the claim text.