Polymer composition for peroxide bleaching of cellulosic fibre material and processes for peroxide bleaching
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United States of America Patent
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Mar 9, 2010
Grant Date -
Jun 22, 2006
app pub date -
Jan 9, 2004
filing date -
Jan 10, 2003
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Abstract
The present invention relates to a polymer composition for peroxide bleaching of a cellulosic fiber material, said composition being in the form of a stable aqueous polymer solution obtained by bringing in an aqueous medium a first polymer (A) comprising a partly or totally acidic homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, into contact with a second polymer (B) comprising a polylactone of a poly-alfa-hydroxyacrylic acid in solid form or as a moist powder or as a slurry, said polymer solution having a pH of at most 8, The invention also relates to peroxide bleaching processes.
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