D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 5/02 (2006.01) D21C 9/08 (2006.01) D21H 17/45 (2006.01)
Patent
CA 2210903
A process for treating recycled coated broke which has been re-pulped to a slurry for the purpose of recycling the coated broke as cellulose fiber to the paper machine by the addition of a water-soluble polymer dispersion is claimed. The water- soluble polymer is formed by polymerizing a water-soluble mixture which comprises: (a) a cationic monomer represented by the following general formula (I): Image wherein R1 is H or CH3; each of R, and R3 is an alkyl group having 1 to 2 carbon atoms; R4 is H or an alkyl group of 1 to 2 carbon atoms; A' is an oxygen atom or NH; B' is an alkylene group of 2 to 4 carbon atoms or a hydroxypropylene group; and X- is an anionic counterion: and (b) a second monomer represented by (meth)acrylamide (in an aqueous solution of a polyvalent anionic salt). wherein the polymerization is carried out in the presence of either an organic high-molecular weight multivalent cation comprising a water-voluble polymer containing at least one monomer of formula (I) and/or poly diallyl dimethyl ammonium chloride (DADMAC).
Nalco Chemical Company
Smart & Biggar
LandOfFree
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