Patent ID: 7449212

Claim:
A method for producing a security document ( 1 ) with a security element ( 2 , 3 ), the security element ( 2 , 3 ) being produced using a material (M) that is optically changeable by an electric field (E) or magnetic field, the optically changeable material (M) including a plurality of particles ( 8 , 9 ) that are changeable in at least one of their position or alignment by means of an electric field (E) or magnetic field, the optically changeable material (M) being produced by enclosing the particles ( 8 , 9 ) in microcapsules ( 7 ) and incorporating them in a binder ( 6 ), characterized in that for activating the optically changeable material (M) the microcapsules ( 7 ) are brought by a swelling agent into a swollen state in which the particles ( 8 , 9 ) are supported movably in the microcapsules ( 7 ), the optically changeable material (M) being applied to the security document ( 1 ) in a nonactivated state.