Consejo Superior De Investigaciones Cientificas

Fabrica Nacional De Moneda Y Timbre-real Casa De La Moneda

Tolsa, S.a.

Miguel Angel Rodriguez Barbero

Vicente Garcia Juez

Javier Gamo Aranda

Jose Francisco Fernandez Lozano

Antonio Alvarez Berenguer

Antonio Esteban Cubillo

Juan José Romero Fanego

Juan Jose Romero Fanego

Elena Palacios Zambrano

Maria Pilar Leret Molto

Jose Francisco Fernández Lozano

Antonio Heliodoro De Aza Moya

The present invention relates to the use of non-deactivatable security compositions comprising the combination of at least two types of particles of oxide materials, where said particles have a different size and/or morphology, and where the inorganic oxide materials have at least one transition metal or one lanthanide element, and radiofrequency wave absorption properties. The invention also relates to security articles, documents or elements incorporating these compositions, as well as to a method and to a system for detection thereof.

Use of radiofrequency wave absorbing markets for the authentication of security documents

The present invention relates to a method for preparing hierarchically ordered structures of inorganic phosphate particles, homogeneously deposited on the surface of a phyllosilicate, which is characterized in that it comprises the following steps: a) obtaining an acid solution of precursor compounds of an inorganic phosphate; b) preparing a dispersion of particles of a phyllosilicate in aqueous medium and acidifying the phyllosilicate dispersion by adding at least one acid, thereby obtaining an acid dispersion; c) mixing the acid solution obtained in step a) with the dispersion obtained in step b); and d), with stirring, adding a base to the mixture obtained in step c) until the required pH value for precipitating the corresponding inorganic phosphate on the phyllosilicate particles has been achieved, resulting in a hierarchically ordered structure of homogeneously distributed submicrometric or nanometric inorganic phosphate particles supported on the phyllosilicate surface.

Method for obtaining hierarchically ordered inorganic phosphate structures on phyllosilicates

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Madrid, Spain

Miguel Angel Rodriguez Barbero