Thermoplastic comprising metal identification platelets
View Patent ↗The invention relates to a transparent thermoplastic material, containing 0.0001 to 2 wt. % of substantially flat metal identification platelets with a largest length elongation of less than 200 μm and a thickness of 2-10 μm, a round or n-angled shape where n≧4, wherein the metal identification platelets do not have any recesses or have recesses that lie substantially in the center of the metal identification platelet, do not come closer than 20 μm to the circumferential outer edge of the metal identification platelet, and do not account for more than 30% of the surface area of the metal identification platelet. The invention also relates to the production thereof and the use for producing films for personalization of a card layer composite and data carriers in card form, especially smart cards, magnetic strip cards, identification cards and the like.
1. A transparent thermoplastic material, containing 0.0001 to 2 wt. % of substantially flat metal identification platelets with a greatest longitudinal dimension of less than 200 μm and a thickness of 2-10 μm, wherein the metal identification platelets do not have any recesses or have recesses that lie substantially in the centre of the metal identification platelet, do not come closer than 20 μm to the circumferential outer edge of the metal identification platelet, and do not account for more than 30% of the surface area of the metal identification platelets, wherein the metal identification platelets are tetragonal, pentagonal, hexagonal, heptagonal or round, wherein the transparent thermoplastic material is polycarbonate and the metal identification platelets are made of nickel.
2. The transparent thermoplastic material according to claim 1 , wherein the recesses have the shape of letters or numerals.
3. The transparent thermoplastic material according to claim 1 , wherein the recesses have the shape of S, X, dot or circle.
4. The transparent thermoplastic material according to claim 1 , containing 0.01 to 0.1 wt. % of metal identification platelets.
5. The transparent thermoplastic material according to claim 1 , containing 0.06 wt. % of metal identification platelets.
6. A film containing the transparent thermoplastic material according to claim 1 .
7. A multi-layer product containing the transparent thermoplastic material according to claim 1 .
8. The multi-layer product according to claim 7 , wherein the product is a card.
9. A process for the production of a film which comprises
a) compounding the transparent thermoplastic material according to claim 1 to form a compound; and
b) extruding the compound from step a) into a film.
10. A process for the production of a card which comprises
a) compounding the transparent thermoplastic material according to claim 1 to form a compound;
b) extruding the compound from step a) into a film; and
c) processing the film from step b) into a card.
11. The process according to claim 10 , wherein in step c) the film is laminated on a substrate.