D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/10 (2006.01) D21H 21/32 (2006.01)
Patent
CA 2514798
A 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 phosphonium compound preferably containing at least one phosphorus hydroxyalkyl bond/linkage, for example a 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 phosphonium compound is the commercially available, tetrakis(hydroxymethyl)phosphonium chloride (THPC), [P(CH2OH)4]Cl.
L'invention porte sur un procédé de blanchiment et de stabilisation du brillant de matériaux lignocellulosiques en particulier: (a) des pâtes de bois telles que les pâtes thermomécaniques (TMP) et les pâtes chimicothermomécaniques (CTMP), et (b) des papiers de pâte de bois. On utilise à cet effet une phosphine hydrosoluble ou un composé de phosphonium contenant de préférence au moins une liaison/fixation phosphore/hydroxyalkyle, par exemple une liaison/fixation phosphore/hydroxyméthyle (P-CH¿2?OH). L'un des exemples de phosphine hydrosoluble est la tris(hydroxyméthyl)phosphine (THP), P(CH¿2?OH)¿3?, disponible dans le commerce. L'un des exemples de composé de phosphonium est le chlorure de tétrakis(hydroxyméthyl) phosphonium (THPC), [P(CH¿2?OH)¿4?]Cl, disponible dans le commerce.
Ezhova Maria B.
Hu Thomas Qiuxiong
James Brian R.
Yawalata Dominggus
Fpinnovations
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Pulp And Paper Research Institute Of Canada
University Of British Columbia
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