White plastic sheet with low metamerism
AssigneeThe Gilman Brothers Company
InventorEvan Gilman
Life of this patent
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Abstract
A metamerism-resistant printable plastic sheet, especially white sheet, in which the desired shade of white can be easily specified or adjusted. This is achieved by separately controlling the opacity and the brightness. The opacity is controlled by the concentration of white pigment in a plastic base layer and the brightness is controlled by the concentration of an optical brightener in a plastic print layer bonded to, and preferably coextruded with, the base layer. Such a sheet can be bonded to one or both sides of a rigid core to create a graphics board, or used as a stand-alone flexible print sheet. Preferably, the plastic print layer comprises a polymer resin that is inherently resistant to a yellowing reaction from exposure to UV light.
Claims22
A rigid display board comprising a flat, rigid cellular foam core and a printable sheet bonded to the cellular foam core, wherein the printable sheet comprises:
- a base layer containing pigment and an unpigmented plastic print layer containing an optical brightener in this order on the cellular foam core, and wherein the print layer is bonded to the base layer.
A rigid display board comprising:
- a flat, rigid cellular foam core and a printable sheet bonded to the cellular foam core, wherein the printable sheet comprises a base layer containing pigment and an unpigmented plastic print layer containing an optical brightener in this order on the cellular foam core, and wherein the print layer comprises an acrylic resin and is bonded to the base layer.
A rigid display board comprising a flat, rigid cellular foam core and a printable sheet bonded to the cellular foam core, wherein the printable sheet consists of a base layer containing TiO2 pigment without optical brightener, and an unpigmented plastic print layer containing an optical brightener at a concentration of 0.01 wt. % to 0.10 wt. % of the print layer in this order on the cellular foam core, and wherein the print layer is bonded to the base layer.
Dependencies are inferred from the claim text.