Thomson Licensing

Evonik Rohm Gmbh

Kraussmaffei Technologies Gmbh

Erwin Buerkle

Martin Eichlseder

Klaus Albrecht

Arne Schmidt

Marc Poth

Christian Eberle

The present invention relates to a process for the production of coated mouldings, by injecting a moulding composition into an injection mould and cooling the composition to obtain a moulding, and altering the injection mould in such a way as to produce an intermediate space between a surface to be coated of the moulding and the inner surface of the injection mould, and using injection moulding to charge a reactive mixture to the resultant intermediate space, where the temperature of at least a portion of the injection mould is increased for the curing of the reactive mixture. The present invention moreover describes a system for the conduct of the process described above.

Method for the production of coated moldings

A device and a method are disclosed for producing an optical data medium, in particular high density optical media, such as the recently developed BlueRay&#x2122; disk for illumination with a blue laser (&#x3bb;&#x2248;405 nm). The required thickness of the data and/or protective layers is of the order of at most several tenths of millimeters. Such thin layers are difficult to produce with conventional injection molding processes. The disclosed device and method solve this problem by overflowing an element placed in a narrow cavity with a low-viscosity material having a viscosity lower than the viscosity of polycarbonate, which then forms the data or protective layer, or by bonding a layer produced in this manner to another layer using a low-viscosity adhesive.

Apparatus and method for producing optical data carriers

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Benediktbeuern, Germany

Erwin Buerkle