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US 10,589,556 B2Granted
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AssigneeOmya International AG
InventorsRoger Bollström, Patrick A. C. Gane, Joachim Schoelkopf
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Abstract
The present invention relates to a method of manufacturing a substrate with an embedded, UV-visible pattern, wherein a liquid treatment composition comprising at least one acid is deposited onto a substrate, which comprises at least one optical brightener and optionally a filler, wherein the filler comprises 0 to 60 wt.-% of a salifiable alkaline or alkaline earth compound, based on the total weight of the substrate.
Claims20
A method of manufacturing a substrate with an embedded, UV-visible pattern, the method comprising the following steps:
- a) providing an uncoated substrate comprising at least one optical brightener and a filler, wherein the filler comprises from 0 to 60 wt.-% of a salifiable alkaline or alkaline earth compound, based on the total weight of the substrate, b) providing a liquid treatment composition comprising at least one acid, and c) applying the liquid treatment composition onto at least one region of the substrate in form of a preselected pattern to form an embedded, UV-visible pattern.
Dependencies are inferred from the claim text.