Use of dispersion polymers for coated broke treatment
AssigneeNalco Chemical Company
InventorJon E. Pearson
Life of this patent
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Abstract
A process for treating a re-pulped coated broke slurry comprising the addition of a water-soluble polymer dispersion, the water-soluble polymer is formed by polymerizing a water-soluble mixture which comprises: (a) a first cationic monomer represented by the following formula (I): ##STR1## and/or a second cationic monomer represented by the following general formula (II): ##STR2## and (b) (meth)acrylamide in an aqueous solution of a polyvalent anion salt, wherein the polymerization is carried out in the presence of either an organic high-molecular multivalent cation comprising a water-soluble polymer containing at least one monomer of formula (II) or an alkyl ester of acrylic acid.
Claims13
A process for treating a repulped coated broke slurry which comprises adding to such slurry a water soluble dispersion polymer at a level of from 0.2 to 10 pounds polymer contained in such dispersion per ton of total broke solids, said water soluble dispersion polymer containing:
- A. from about 5 to about 100 mole percent of a monomer represented by Formula I:
- ##STR7## wherein R.sub.1 is H or CH.sub.3 ;
- each of R.sub.2 and R.sub.3 is an alkyl group having from 1 to 3 carbon atoms;
- A is an oxygen atom or NH;
- B is an alkylene group having from 2 to 4 carbon atoms or a hydroxypropylene group;
- and X.sup.- is an inorganic anionic counterion;
- B. from about about 0 to about 50 mole percent of a second water soluble cationic monomer;
- and,
- C. from about 0 to about 95 mole percent (meth)acrylamide;
- and wherein said water soluble polymer is prepared in an aqueous solution of a polyvalent anion salt in the presence of from 1 to 10% by weight based on the total weight of monomers A, B, and C of an organic high molecular weight multivalent cation comprising a water soluble polymer containing at least 20 mole percent of:
- a) either at least one monomer represented by Formula II:
- ##STR8## wherein R.sub.4 is H or CH.sub.3 ;
- each of R.sub.5 and R.sub.6 is an alkyl group having from 1 to 2 carbon atoms;
- R.sub.7 is H or an alkyl group having from 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.sup.- is an anionic counterion;
- or,
- b) an alkyl ester of acrylic acid.
Dependencies are inferred from the claim text.