Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Reexamination Certificate
2011-01-11
2011-01-11
Woodward, Ana L (Department: 1796)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Waste paper or textile waste
C008S111000, C162S006000, C162S008000, C162S013000, C162S072000, C162S078000, C252S186260, C252S186270
Reexamination Certificate
active
07867357
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 5. The invention also relates to peroxide bleaching processes.
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Ahlgren Jonni
Härmä Timo
Jäkärä Jukka
Paren Aarto
Renvall Ilkka
Birch & Stewart Kolasch & Birch, LLP
Kemira Oyj
Woodward Ana L
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