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A new class of bleaching and brightness stabilizing agents. Part III: Brightness stabilization of mechanical pulps

TitleA new class of bleaching and brightness stabilizing agents. Part III: Brightness stabilization of mechanical pulps
Publication TypeJournal Article
Year of Publication2006
AuthorsHu, TQ, James, BR, Yawalata, D, Ezhova, MB
JournalJournal of Pulp and Paper Science
Volume32
Pagination131-136
Date PublishedJul-Sep
Type of ArticleArticle
ISBN Number0826-6220
Keywordsbleached pulps, bleaching, brightness, HIGH-YIELD PULPS, LIGHT, mechanical pulps, PAPER, phosphorus compounds, REVERSION, stabilizers, YELLOWING INHIBITOR
Abstract

Recently, we discovered that water-soluble tertiary hydroxyalkyl phosphines and quaternary hydroxymethyl phosphonium salts were capable of providing a bleaching effect similar to or higher than that achievable with hydrosulphite on mechanical pulps over a wide range of pH, consistency and temperature. Now, we have found that mechanical pulps bleached with these phosphorus (P) compounds are more stable than those bleached with hydrosulphite, not only when exposed to heat and moisture, but also during ambient dark storage. One of the P compounds, tris(hydroxypropyl)phosphine (THPP), P(CH2CH2CH2OH)(3), is also effective in providing additional brightness gains to, and in improving the light stability of papers made from peroxide-bleached mechanical pulps.

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