METHOD FOR PRODUCING A FILM COMPOSITE MATERIAL AND A CARD BODY
A method for producing a foil composite material, in particular for use as a layer in a card body, preferably in a card body of a portable data carrier, whereby using a coextrusion process, at least a first plastic melt of plastic including a thermoplastic elastomer and at least a second plastic melt of plastic without a thermoplastic elastomer, are joined in such a fashion that a foil composite material is formed. This foil composite material contains one or several outer first layers of plastic without a thermoplastic elastomer, one or several middle second layers of plastic including a thermoplastic elastomer and one or several outer third layers of plastic without a thermoplastic elastomer.
1 .- 11 . (canceled)
12 . A method for producing a foil composite material, comprising the steps:
using a coextrusion process, joining at least a first plastic melt of plastic comprising thermoplastic elastomer and at least a second plastic melt of plastic without thermoplastic elastomer to form a foil composite material comprising one or several outer first layers of plastic without thermoplastic elastomer, one or several middle second layers of plastic comprising a thermoplastic elastomer on urethane basis and one or several outer third layers of plastic without thermoplastic elastomer;
at least one of said one or several outer first and third layers comprising polycarbonate, polyester, copolyester, a blend of polyesters or a blend of polycarbonate with one or several polyesters.
13 . The method according to claim 12 , wherein the one or several middle second layers comprise polyethylene terephthalate copolyester with a content of thermoplastic elastomer on urethane basis.
14 . The method according to claim 12 , including forming a foil of composite material, whose one or several middle second layers have a Shore A hardness of 90 or higher and a Shore D hardness of 50 or higher, or whose one or several middle second layers have a Shore A hardness of 95 or lower and a Shore D hardness of 50 or lower.
15 . The method according to claim 2 , wherein the coextrusion process is carried out at a mass temperature of 200° C. or higher.
16 . A foil composite material made by the method recited in claim 12 .
17 . A method for producing a card body, comprising the steps:
providing or forming a foil composite material in accordance with the method recited in claim 12 , and
laminating said foil composite material with a plurality of layers of plastic, said plurality of layers comprising at least one layer of the foil composite material.
18 . The method according to claim 17 , including carrying out the laminating step under pressure at a temperature of between 120° C. and 200° C., with the pressure during laminating being between 10 and 60 bar.
19 . The method according to claim 17 , wherein upon laminating the layers, at least one of the cover layers comprises the foil composite material.
20 . A card body, comprising a plurality of layers laminated above each other, wherein the card body is made using the method recited in claim 17 .