Method for manufacture of paper, board or the like and use of the composition
AssigneeKemira Oyj
InventorsMatti HIETANIEMI, Jaakko EKMAN, Asko KARPPI, Kimmo STRENGELL
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Abstract
A method for manufacture of paper, board or the like, comprising the step of dissolving a composition into aqueous solution, whereby an aqueous treatment solution is obtained for adding the obtained treatment solution to the pulp. The composition comprising a copolymer of acrylamide and at least one cationic monomer, the copolymer comprising cationic monomers at least 15 mol-%, calculated from total amount of monomers, and an ionic crosslinker agent comprising at least two carboxyl groups, wherein the equivalent ratio of carboxyl groups:cationic monomer is between 1:20 and 1:0.5.
Claims20
A method for making of paper, board or the like, comprising the steps of:
- providing pulp,
- dissolving into an aqueous solution a composition comprising:
- (i) a copolymer of acrylamide and at least one cationic monomer, the copolymer comprising cationic monomers of at least 15 mol-%, calculated from the total amount of monomers, and
- (ii) an ionic crosslinker agent comprising at least two carboxyl groups, wherein the equivalent ratio of carboxyl groups:cationic monomer is between 1:20 and 1:0.5, whereby an aqueous treatment solution is obtained,
- adding the obtained treatment solution to the pulp, and
- forming the pulp into a fibrous web.
Use of a composition comprising:
- (i) a copolymer of acrylamide and at least one cationic monomer, the copolymer comprising cationic monomers of at least 15 mol-%, calculated from the total amount of monomers, and
- (ii) an ionic crosslinker agent comprising at least two carboxyl groups, wherein the equivalent ratio of carboxyl groups:cationic monomer is between 1:20 and 1:0.5, preferably between 1:15 and 0.8, and more preferably between 1:10 and 1:1, as dry strength agent and/or drainage agent and/or retention agent for starch and colloids for manufacture in paper, board or the like.
Dependencies are inferred from the claim text.