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US 12,600,871 B2Granted
Dye-exchanged zeolite marker
AssigneeSaes Getters S.P.A.
InventorsPaolo Vacca, Stefano Zilio, Anna Nuzzo, Katarzyna Fidecka, Agnello De Simone
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Abstract
A dye-exchanged zeolite marker wherein the zeolite is characterized by a pores size comprised between 4 Å and 12 Å and the dye is an organic cationic molecule, characterized by an amount of dye comprised between 0.05% wt and 1% wt with respect to the zeolite weight, optically active compositions comprising the same dispersed in a polymeric matrix and their use as a detectable marker.
Claims12
A dye-exchanged zeolite marker comprising a zeolite and a dye, wherein:
- a) the zeolite is in the form of a powder with an average particle size characterized by a X90 value comprised between 0.5 and 50 μm and a pore size comprised between 4 Å and 12 Å,
- b) the dye is an organic cationic molecule selected from the group consisting of Rhodamine B, Tetramethyl rhodamine isothiocyanate-Dextran, Rhodamine 6G, Rhodamine B isothiocyanate, and Rhodamine 19 perchlorate, and
- c) the amount of the dye is comprised between 0.05% wt and 1% wt with respect to the zeolite weight.
Dependencies are inferred from the claim text.