Methods for identity verification using transparent luminescent polymers
First Claim
1. A monolayer or multilayer sheet or film for use as a marker, label, taggant or packaging film comprising at least one layer of a transparent, luminescent polymer composition whereinthe composition comprises (1) at least one E/X/Y copolymer or copolymer of alkyl (meth)acrylate and (meth)acrylic acid and (2) one or more organic acids or salts thereof;
- E is ethylene, X is a C3 to C8 α
,β
ethylenically unsaturated carboxylic acid, and Y is alkyl acrylate or alkyl methacrylate in which each the alkyl group has one to eight carbon atoms;
X is from about 2 to about 30 weight % of the E/X/Y copolymer and Y is from 0 to about 40 weight % of the E/X/Y copolymer;
The (meth)acrylate is acrylate or methacrylate and the (meth)acrylic acid is acrylic acid or methacrylic acid; and
the combined carboxylic acid functionalities in the composition are at least partially neutralized by a rare earth cation selected from europium or terbium and optionally one or more additional rare earth cations.
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Abstract
Disclosed are methods of using a transparent, luminescent polymer for transparent marking and/or labeling for identity verification purposes. Also disclosed are sheets, films, markers, labels and taggants comprising transparent, luminescent polymers. Also disclosed are articles labeled with a transparent, luminescent polymer. This invention particularly relates to use of transparent, luminescent polymer compositions comprising ethylene (meth)acrylic acid copolymers and rare earth ions and transparent, luminescent polymer compositions comprising methyl (meth)acrylate/(meth)acrylic acid copolymers, fatty acids and rare earth ions for these purposes.
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Citations
8 Claims
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1. A monolayer or multilayer sheet or film for use as a marker, label, taggant or packaging film comprising at least one layer of a transparent, luminescent polymer composition wherein
the composition comprises (1) at least one E/X/Y copolymer or copolymer of alkyl (meth)acrylate and (meth)acrylic acid and (2) one or more organic acids or salts thereof; -
E is ethylene, X is a C3 to C8 α
,β
ethylenically unsaturated carboxylic acid, and Y is alkyl acrylate or alkyl methacrylate in which each the alkyl group has one to eight carbon atoms;
X is from about 2 to about 30 weight % of the E/X/Y copolymer and Y is from 0 to about 40 weight % of the E/X/Y copolymer;The (meth)acrylate is acrylate or methacrylate and the (meth)acrylic acid is acrylic acid or methacrylic acid; and the combined carboxylic acid functionalities in the composition are at least partially neutralized by a rare earth cation selected from europium or terbium and optionally one or more additional rare earth cations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification