Aqueous dispersions
OwnerSun-Yi Huang, Louis Rosati +1inventors
InventorsSUN-YI HUANG, LOUIS ROSATI, JOSEPH J. KOZAKIEWICZ
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Abstract
Aqueous dispersions of cationic water-soluble polymers are provided, as well as processes for making and methods of using the same.
Claims22
A process which comprises polymerizing vinyl-addition monomers comprised of a first monomer of the formula (II) to form an aqueous dispersion comprised of a first cationic water-soluble or water-swellable polymer,
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- wherein R1 is H or CH3, A is O or NH, B is an alkylene or branched alkylene or oxyalkylene group having from 1 to 5 carbons, R2 is a methyl, ethyl or propyl group, R3 is a methyl, ethyl or propyl group, R4 is a methyl, ethyl or propyl group, and X is a counterion,
- wherein said polymerizing is carried out in the presence of an aqueous composition comprised of at least one second cationic water-soluble polymer different from said first polymer,
- wherein, if said vinyl-addition monomers are further comprised of a second monomer of formula (II) wherein R1 is H or CH3, A is O or NH, B is an alkylene or branched alkylene or oxyalkylene group having from 1 to 5 carbons, X is a counterion, and R2, R3 or R4 is selected from the group consisting of C4-C10 alkyl, benzyl, and C2H4C6H5, then the amount of said first monomer is greater than the amount of said second monomer on a molar basis, and
- wherein, if said R2, R3 and R4 in said first monomer together contain a total of 3 carbon atoms, then said first polymer is devoid of hydrophobic recurring units.
A process which comprises polymerizing vinyl-addition monomers comprised of (1) from about 5 to about 55 mole % of the methyl chloride or dimethylsulfate quaternary salt of diethylaminoethylacrylate, (2) from about 45 to about 90 mole % of acrylamide, and (3) from 0 to about 35 mole % of the methyl chloride or dimethylsulfate quaternary salt of dimethylaminoethylacrylate, based on total moles of monomer, to form an aqueous dispersion comprised of a first cationic water-soluble or water-swellable polymer;
- wherein said polymerizing is carried out in the presence of an aqueous composition comprised of (a) at least one second, predominately cationic, water-soluble polymer different from said first polymer;
- and (b) a salt selected from the group consisting of ammonium sulfate, sodium sulfate and mixtures thereof;
- wherein said aqueous dispersion contains from about 10 to about 30%, by weight, of said first polymer, about 2 to about 8%, by weight, of said second polymer, and about 10 to about 25%, by weight, of said salt, based on total weight, and
- wherein, if said vinyl-addition monomers are further comprised of (4) a monomer of formula (II)
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- wherein R1 is H or CH3, A is O or NH, B is an alkylene or branched alkylene or oxyalkylene group having from 1 to 5 carbons, X is a counterion, and R2, R3 or R4 is selected from the group consisting of C4-C10 alkyl, benzyl, and C2H4C6H5, then the amount of said (1) is greater than the amount of said (4) on a molar basis.
Dependencies are inferred from the claim text.