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Application of yellowing inhibitors to improve the brightness stability of coated mechanical papers.

Application: This study demonstrates the effectiveness of yellowing inhibitors absorber (UVA) and a hindered hydroxylamine radical scavenger (RS). After 250 days of ambient light exposure, a sheet with a 4 g/[m.sup.2] /side coating lost 27 points ISO brightness. A sheet with 1.0% RS and 0.11% UVA added to the coating color lost only 11 points brightness. The inhibitors were compatible with the coating formulation and caused no runnability problems. The yellowing inhibitors had a negligible effect on the physical properties and printability of the treated paper.

Yuan, Schmidt, and Heitner are with Paprican, Pointe-Claire, Quebec, Canada; Fairbank is with Abitibi-Consolidated Inc., Montreal, Quebec. Email Yuan at
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Title Annotation:Coating
Author:Fairbank, Martin
Publication:Solutions - for People, Processes and Paper
Date:May 1, 2003
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