BLEACHING AND BRIGHTNESS STABILIZATION OF LIGNOCELLULOSIC MATERIALS WITH WATER SOLUBLE PHOSPHINES OR PHOSPHONIUM COMPOUNDS
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Countries |
Status |
Issued |
Issue # |
EP,AT,DE,FI,SE |
Issued |
10/25/2006 |
EP 1590525 |
| PATENT ABSTRACT [Paprican Ref. No. 4170] |
A novel method for the bleaching and brightness stabilization of lignocellulosic materials is described. The method involves the treatment of lignocellulosic materials, in particular, (a) wood pulps such as thermomechanical pulps (TMP) and chemithermomechanical pulps (CTMP), and (b) papers made from wood pulps, with a water-soluble phosphine or a quaternary phosphonium compound containing at least one phosphorus hydroxymethyl bond/linkage (P-CH2OH). One example of such a water-soluble phosphine is the commercially available, tris(hydroxymethyl)phosphine (THP), P(CH2OH)3. One example of such a quaternary phosphonium compound is the commercially available, tetrakis(hydroxymethyl)phosphonium chloride (THPC), [P(CH2OH)4]Cl. |
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