Use of diallyldimethylammonium chloride acrylamide dispersion copolymer in a papermaking process
First Claim
1. In a papermaking process consisting essentially of:
- forming an aqueous cellulosic papermaking slurry;
adding to the slurry certain additives, with said certain additives selected from the group including;
coagulants;
sizing agents; and
mineral fillers;
draining the slurry to form a sheet; and
drying the sheet to form a paper sheet;
the improvement comprising adding to the slurry, prior to it being drained;
from about 0.02 lbs polymer/ton to about 20 lbs polymer/ton of a cationic dispersion polymer;
which cationic dispersion polymer is a copolymer comprising about 30 mole % diallyldimethylammonium chloride (DADMAC) and about 70 mole % acrylamide (AcAm); and
dispersion polymer has an RSV of about 5.0 dl/g; and
adding to the slurry, either before or after said cationic dispersion polymer is added and the slurry is drained, from about 0.05 lbs microparticle/ton to about 25.0 lbs microparticle/ton of a microparticle selected from the group consisting of a) copolymers of acrylic acid and acrylamide;
b) bentonite; and
c) dispersed silica;
with the proviso that said coagulant cannot be a cationic dispersion copolymer comprising about 30 mole % diallyldimethylammonium chloride (DADMAC) and about 70 mole % acrylamide (AcAm).
12 Assignments
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Accused Products
Abstract
A papermaking process consisting essentially of:
forming an aqueous cellulosic papermaking slurry;
adding to the slurry certain additives, with said certain additives selected from the group including: coagulants; sizing agents; and mineral fillers;
draining the slurry to form a sheet; and
drying the sheet to form a paper sheet;
the improvement comprising adding to the slurry, prior to it being drained; an effective amount of a cationic dispersion polymer; which cationic dispersion polymer is a copolymer comprising about 30 mole % diallyldimethylammonium chloride (DADMAC) and about 70 mole % acrylamide (AcAm); and
adding to the slurry, either before or after said cationic dispersion polymer is added and the slurry is drained,
a microparticle selected from the group consisting of
a) copolymers of acrylic acid and acrylamide;
b) bentonite; and
c) dispersed silica;
with the proviso that said coagulant cannot be a cationic dispersion copolymer comprising about 30 mole % diallyldimethylammonium chloride (DADMAC) and about 70 mole % acrylamide (AcAm).
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Citations
14 Claims
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1. In a papermaking process consisting essentially of:
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forming an aqueous cellulosic papermaking slurry;
adding to the slurry certain additives, with said certain additives selected from the group including;
coagulants;
sizing agents; and
mineral fillers;
draining the slurry to form a sheet; and
drying the sheet to form a paper sheet;
the improvement comprising adding to the slurry, prior to it being drained;
from about 0.02 lbs polymer/ton to about 20 lbs polymer/ton of a cationic dispersion polymer;
which cationic dispersion polymer is a copolymer comprising about 30 mole % diallyldimethylammoniumchloride (DADMAC) and about 70 mole % acrylamide (AcAm); and
dispersion polymer has an RSV of about 5.0 dl/g; and
adding to the slurry, either before or after said cationic dispersion polymer is added and the slurry is drained, from about 0.05 lbs microparticle/ton to about 25.0 lbs microparticle/ton of a microparticle selected from the group consisting of a) copolymers of acrylic acid and acrylamide;
b) bentonite; and
c) dispersed silica;
with the proviso that said coagulant cannot be a cationic dispersion copolymer comprising about 30 mole % diallyldimethylammonium chloride (DADMAC) and about 70 mole % acrylamide (AcAm). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification