Transparently coated polycarbonate component, its production and use
AssigneeCovestro Deutschland AG
InventorsDirk Hinzmann, Timo Kuhlmann, Peter Capellen
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Abstract
The present invention relates to a multilayer construction containing a support or frame composed of a nontransparent polymer as layer c) and a transparent layer b) based on a thermoplastic polymer having a solar transmittance TDS of more than 20%, determined in accordance with ISO 13837:2008 at a layer thickness of 4 mm, and a siloxane-based protective layer a) which is applied to layer c) and layer b), wherein the siloxane layer a) is selectively postcured in selected regions by means of ultrashort-wave UV radiation, and to a method for selective surface treatment.
Claims20
A multilayer construction, comprising:
- a) a siloxane-based protective layer;
- b) a transparent layer based on a thermoplastic polymer having a first surface and an opposing second surface, wherein the siloxane-based protective layer is disposed on the first surface;
- and
- c) a carrier or frame layer of a nontransparent polymer, disposed on and covering only a portion of the second surface, with a remaining portion not covered forming in plan view a region of the transparent layer having a solar transmittance TDS of greater than 20% (determined according to ISO 13837:2008 at a layer thickness of 4 mm),
- wherein the siloxane-based protective layer is post-cured using ultrashortwave UV radiation only in the region where the solar transmittance is greater than 20%, not overlapping with the carrier or frame in plan view.
A process for surface treating a multilayer construction, wherein the multilayer construction comprises:
- a) a siloxane-based protective layer;
- b) a transparent layer based on a thermoplastic polymer having a first surface and an opposing second surface, wherein the siloxane-based protective layer is disposed on the first surface;
- and
- c) a carrier or frame layer of a nontransparent polymer, disposed on and covering only a portion of the second surface, with a remaining portion not covered forming in plan view a region of the transparent layer having a solar transmittance TDS of greater than 20% (determined according to ISO 13837:2008 at a layer thickness of 4 mm),
- wherein the step of surface treating comprises post-curing the siloxane-based protective layer using ultrashortwave UV radiation only in the region where the solar transmittance is greater than 20%, not overlapping with the carrier or frame in plan view.
Dependencies are inferred from the claim text.