Coextruded foil composite material and its use in card bodies

Patent metadata

Field	Value
Publication number	US-9676133-B2
Application number	US-201414172528-A
Country	US
Kind code	B2
Filing date	Feb 4, 2014
Priority date	Feb 25, 2010
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A composite film material usable in a data carrier card body includes a first outer plastic layer, an inner plastic layer and a second outer plastic layer, all the layers together forming a coextruded composite. The plastic material of the first outer layer is a polyethylene terephthalate glycol copolymer (PETG) or contains a PETG, the plastic material of the inner layer is a thermoplastic elastomer (TPC) or contains a TPC, and the plastic material of the second outer layer is a PETG or contains a PETG.

First claim

The invention claimed is:

1. A method for manufacturing a foil composite material in the form of a coextrusion of a first outer layer plastic material, a second outer layer plastic material, and an inner layer plastic material, comprising:
merging all the plastic materials in a molten state, and extruding them through an extruder nozzle that extrudes a foil, to thereby obtain an extruded foil composite material, in which the inner plastic layer is formed between the first and the second outer plastic layer,
wherein the inner layer plastic material is a thermoplastic copolyester elastomer (TPC) or contains a TPC, and
the first and the second outer layers each comprise an outermost partial layer of polyethylene terephthalate glycol copolymer (PETG) or containing a PETG, and an innermost partial layer comprising a mixture of PETG and TPC,
wherein the innermost partial layers each comprise 20% of a total layer thickness of the foil composite material, and
wherein the content of TPC is higher the further inward the plastic material is located and the content of PETG is higher the further outward the plastic material is located.

2. The method according to claim 1 , wherein the coextrusion is carried out at a nozzle temperature of 210 to 260° C.

3. The method according to claim 1 , wherein the extruder flow rates are set such that a foil composite material is coextruded, and wherein the thickness of the inner layer constitutes 40 to 80% of the thickness of the foil composite material.

4. The method according to claim 1 , wherein the first and/or the second outer plastic layer contains an antiblocking agent in the range of up to and including 4 wt. %.

5. A method for manufacturing a foil composite material in the form of a coextrusion of a first outer layer plastic material, a second outer layer plastic material, and an inner layer plastic material, comprising:
merging all the plastic materials in a molten state, and extruding them through an extruder nozzle that extrudes a foil, to thereby obtain an extruded foil composite material, in which the inner plastic layer is formed between the first and the second outer plastic layer,
wherein the inner layer plastic material is a thermoplastic copolyester elastomer (TPC) or contains a TPC, and
the first and the second outer layers each comprise at least one outermost partial layer of polyethylene terephthalate glycol copolymer (PETG) or containing a PETG, and at least one innermost partial layer comprising a mixture of PETG and TPC,
wherein the content of TPC is higher the further inward the plastic material is located and the content of PETG is higher the further outward the plastic material is located, and
wherein the first outer layer contains 96 wt. % or more PETG, and
wherein the inner layer is the thickest layer, and
wherein the thickness of the inner layer constitutes 60 to 80% of the thickness of the foil composite material.

6. The method according to claim 5 , wherein the outermost partial layer of the first outer layer contains an antiblocking agent in the range of up to and including 4 wt. %.

7. The method according to claim 5 , wherein one or more of the first outer layer, the inner layer, and the second outer layer contains one or more additives selected from the group consisting of fillers, color pigments, oxidation stabilizers, UV stabilizers, laser additives, flame retardants, and optical brighteners.

8. The method according to claim 1 , wherein the total layer thickness of the foil composite material lies in the range of 50 μm to 350 μm.

Assignees

• Giesecke & Devrient Gmbh

Inventors

• Riedl Josef
• Regensburger Cordula
• Braun Andreas

Classifications

• B32B2307/54

  Yield strength; Tensile strength · CPC title

• B32B37/04

  characterised by the partial melting of at least one layer · CPC title

• B29K2105/0044

  Stabilisers, e.g. against oxydation, light or heat · CPC title

• Y10T156/10

  Methods of surface bonding and/or assembly therefor · CPC title

• B32B27/08

  of synthetic resin · CPC title