Polymer composition, its use and a surface size
AssigneeKemira Oyj
InventorsMatti Hietaniemi, Asko Karppi, Rosa Carceller
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Abstract
The invention relates to a water-soluble polymer composition obtained by polymerizing in an aqueous polymerisation medium, which comprises degraded starch, at least following monomers: acrylamide and/or methacrylamide, and >2 mol-% of at least one unsaturated mono- or dicarboxylic acid(s) or salts thereof. The polymer composition has an anionic net charge at pH 7 and a dry solids content of >5 weight-%. The invention relates also to the use of the polymer composition for surface sizing of paper, board or the like as well as to a surface size composition comprising it.
Claims18
A water-soluble polymer composition obtained by polymerizing in an aqueous polymerization medium, which comprises:
- degraded starch;
- at least following monomers:
- acrylamide and/or methacrylamide;
- and
- >2 mol-% of at least one unsaturated mono- or dicarboxylic acid(s) or salts thereof;
- wherein the polymer composition has an anionic net charge at pH 7 a dry solids content of >5 weight-%, and a viscosity in a range of 50-1500 mPas, measured at 10-with % solids concentration, at 25° C., pH 4, using Brookfield DV1 viscometer.
Dependencies are inferred from the claim text.