Near infrared fluorescent security thermal transfer printing and marking ribbons
First Claim
1. A thermal transfer ribbon comprising a ribbon backing element and at least one printing media coated on the backing element layer comprising at least one near infrared fluorescent compound in a concentration which provides detectable fluorescence without imparting color to a mark made from said printing media layer, said near infrared fluorescent compound is selected from the group consisting of phthalocyanine of the formula:
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wherein n is 1 or 2 and naphthalocyanine of the formula;
wherein n is 1-6;
wherein A is selected from the group consisting of Al O arylene (CO2 alkyl)2 and Si(Oarylene CO2, alkyl)2; and
wherein M1 is selected from the group consisting of H, alkyl, O alkyl, O arylene (CO2 alkyl) and S arylene (CO2 alkyl);
said alkyl is independently selected from the group consisting of C4-C18 straight or branched alkyl and wherein said phthalocyanine and naphthalocyanine have at least two alkyl groups selected from the group consisting of C12-C18 straight or branched alkyls.
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Abstract
The present invention relates to thermal transfer ribbons comprising a ribbon backing element and at least one printing media layer comprising at least one near infrared fluorescent compound in a concentration which provides detectable fluorescence without imparting color to a mark made from said printing media layer. Methods for printing marks containing said at least one near infrared fluorescent compounds via thermal transfer and methods for reading said marks are also disclosed.
68 Citations
20 Claims
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1. A thermal transfer ribbon comprising a ribbon backing element and at least one printing media coated on the backing element layer comprising at least one near infrared fluorescent compound in a concentration which provides detectable fluorescence without imparting color to a mark made from said printing media layer, said near infrared fluorescent compound is selected from the group consisting of phthalocyanine of the formula:
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wherein n is 1 or 2 and naphthalocyanine of the formula;
wherein n is 1-6; wherein A is selected from the group consisting of Al O arylene (CO2 alkyl)2 and Si(Oarylene CO2, alkyl)2; and
wherein M1 is selected from the group consisting of H, alkyl, O alkyl, O arylene (CO2 alkyl) and S arylene (CO2 alkyl);
said alkyl is independently selected from the group consisting of C4-C18 straight or branched alkyl and wherein said phthalocyanine and naphthalocyanine have at least two alkyl groups selected from the group consisting of C12-C18 straight or branched alkyls.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification