CHEMICAL COMPOSITION SENSITIVE TO TEMPERATURE VARIATIONS AND METHOD OF PRODUCTION AND USE THEREOF.

摘要

The present invention relates to a magnetizable chemical composition comprising at least one polar solvent (4) selected from the group comprising an alcohol with a number of carbon atoms from C8 to C14 polytetrahydrofuran or a mixture thereof; a ferromagnetic component including a plurality of magnetizable particles (1 ) of Stable Single Domain (SSD) type selected from the group comprising magnetite substituted magnetite and/or ferrite in an amount from 5 to 15% by volume of solvent and having a diameter from about 20 nm to 50 nm; and a polymer component (2) including polyvinyl butyral (PVB) or polyvinyl butyral vinyl alcohol vinyl acetate copolymer in a percentage from 3 to 15% by volume of solvent the polymeric component being shaped as a net or mesh and delimiting a plurality of housing cells or zones (3) in each of which one of said particles (1 ) is housed immersed in the polar solvent (4). The present invention also related to a method of obtaining such a composition a microcapsule comprising the composition an ink comprising the microcapsules and a method of testing a product marked with such ink.