The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 2010
Filed:
Jan. 09, 2004
Jonni Ahlgren, Vaasa, FI;
Aarto Parén, Vaasa, FI;
Jukka Jäkärä, Siivikkala, FI;
Timo Härmä, Espoo, FI;
Ilkka Renvall, Espoo, FI;
Jonni Ahlgren, Vaasa, FI;
Aarto Parén, Vaasa, FI;
Jukka Jäkärä, Siivikkala, FI;
Timo Härmä, Espoo, FI;
Ilkka Renvall, Espoo, FI;
Kemira OYJ, Helsinki, FI;
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.