Thermoplastic comprising metal identification platelets

Patent metadata

Field	Value
Publication number	US-9334385-B2
Application number	US-67770008-A
Country	US
Kind code	B2
Filing date	Sep 2, 2008
Priority date	Sep 12, 2007
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Pudleiner Heinz
• Yesildag Mehmet-Cengiz
• Pophusen Dirk
• Meyer Klaus
• Bayer Materialscience Ag

Inventors

• Pudleiner Heinz
• Yesildag Mehmet-Cengiz
• Pophusen Dirk
• Meyer Klaus

Classifications

• Y10T428/256

  Heavy metal or aluminum or compound thereof · CPC title

• G03H2270/24

  Having particular size, e.g. microscopic · CPC title

• C08L69/00

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08K3/08 Primary

  Metals · CPC title

• C08K7/00

  Use of ingredients characterised by shape · CPC title