Fixative composition, thick stock composition and process for fixating hydrophobic and/or anionic substances on fibres
AssigneeKemira Oyj
InventorsAsko Karppi, Lenita Lindberg, Matti Hietaniemi
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Abstract
The present invention relates to a fixative composition and process for reducing hydrophobic and/or anionic substances in fibre-containing stock for making of paper, board or the like. The composition comprises a synthetic cationic polymer, which has a charge density of 3.0-24 meq/g, and a cationic non-degraded starch, which has charge density of 0.5-3.0 meq/g. The invention relates also to thick stock composition comprising fibres and a fixative composition according to the invention.
Claims26
A fixative composition for making of paper, board or the like, suitable for reducing hydrophobic and/or anionic substances in fibre-containing stock, which fixative composition comprises
- a synthetic cationic polymer, which has a charge density of 3.0-24 meq/g, and
- a cationic non-degraded starch, which has a charge density of 0.5-3.0 meq/g.
17-19. (canceled)
A process for making of paper, board or the like, comprising
- obtaining a thick stock composition with consistency >20 g/l, characterised in
- adding to the thick stock composition a synthetic cationic polymer, which has a charge density 3.0-24 meq/g and a cationic non-degraded starch, which has a charge density of 0.5-3.0 meq/g, thereby fixating hydrophobic and/or anionic substances on fibres by depositing them onto the fibres, fillers and/or fines in the stock.
Dependencies are inferred from the claim text.