Abstract:
PROBLEM TO BE SOLVED: To provide an aqueous dispersion of a water-soluble polymer.SOLUTION: In the aqueous dispersion of a water-soluble polymer of N-vinylformamide and/or N-vinylacetamide, the dispersion includes, based on 100 pts.mass of water, (A) 5-80 pts.mass of a polymer that is water-soluble, includes an N-vinylformamide unit and/or an N-vinylacetamide unit, and has a particle size of 50 nm-2 μm, and (B) 1-50 pts.mass of at least one polymeric dispersant that is incompatible with the water-soluble polymer (A) in an aqueous solution.
Abstract:
Aqueous dispersions of water-soluble and/or water-swellable anionic polymers which are obtainable by free radical polymerization of ethylenically unsaturated, anionic monomers in an aqueous medium in the presence of at leas one stabilizer, the polymerization being carried out in the presence of at least one water-soluble polymer of the groups consisting of (a) graft polymers of vinyl acetate and/or vinyl propionate on (i) polyethylene glycols or (ii) polyethylene glycols or polypropylene glycols blocked at one or both terminal groups with alkyd carboxyl or amino groups, polyalkylene glycols, polyalkylene glycols blocked at one or both terminal groups with alkyl carboxy or amino groups and (b) water-soluble copolymers of (b1) nonionic monoethylenically unsaturated monomers, (b2) cationic monoethylenically unsaturated monomers and if appropriate (b3) anionic monoethylenically unsaturated monomers, the fraction of the interpolymerized cationic monomers being greater than that of the anionic monomers, as a stabilizer, said aqueous dispersions are prepared by free radical polymerization of the anionic monomers in an aqueous medium in the presence of the abovementioned water-soluble polymers (a) and (b) and said aqueous dispersions are used as thickeners for aqueous systems.
Abstract:
The invention relates to aqueous dispersions of water-soluble polymers of N-vinylcarboxamides which are substantially salt-free and contain anionic polymeric stabilizers having a comblike molecular structure, to processes for preparing the dispersions in the presence of anionic polymeric stabilizers having a comblike molecular structure, and to the use of the dispersions as retention aids or fixing aids in papermaking.
Abstract:
The invention relates to aqueous dispersions of water-soluble polymers of N-vinyl-carboxamides, which are substantially salt-free and comprise anionic polymeric stabilizers having a comb-like molecular structure, processes for the preparation of the dispersions in the presence of anionic polymeric stabilizers having a comb-like molecular structure and the use of the dispersions as retention aids or fixing agents in papermaking.
Abstract:
Dispersión acuosa de polímeros aniónicos, solubles en agua y/o hinchables en agua, que pueden ser obtenidos mediante la polimerización por medio de radicales de monómeros aniónicos, etilénicamente insaturados, en medio acuoso en presencia de, al menos, un estabilizante, caracterizado porque la polimerización se lleva a cabo en presencia de una combinación constituida por, al menos, un polímero soluble en agua de los grupos (a) polímeros de injerto de acetato de vinilo y/o de propionato de vinilo sobre (i) polietilenglicoles o (ii) polietilenglicoles cerrados en los grupos extremos por uno o por ambos lados con grupos alquilo, carboxilo o amino o polipropilenglicoles, polialquilenglicoles, polialquilenglicoles cerrados en los grupos extremos por uno o por ambos lados con grupos alquilo, carboxilo o amino y (b) copolímeros solubles en agua constituidos por (b1) monómeros no iónicos monoetilénicamente insaturados, (b2) monómeros catiónicos monoetilénicamente insaturados y, en caso dado, (b3) monómeros aniónicos, monoetilénicamente insaturados, siendo la proporción de los monómeros catiónicos incorporados por polimerización mayor que la de los monómeros aniónicos, que actúa como estabilizante.
Abstract:
Aqueous dispersions of water-soluble and/or water-swellable anionic polymers which are obtainable by free radical polymerization of ethylenically unsaturated, anionic monomers in an aqueous medium in the presence of at leas one stabilizer, the polymerization being carried out in the presence of at least one water-soluble polymer of the groups consisting of (a) graft polymers of vinyl acetate and/or vinyl propionate on (i) polyethylene glycols or (ii) polyethylene glycols or polypropylene glycols blocked at one or both terminal groups with alkyd carboxyl or amino groups, polyalkylene glycols, polyalkylene glycols blocked at one or both terminal groups with alkyl carboxy or amino groups and (b) water-soluble copolymers of (b1) nonionic monoethylenically unsaturated monomers, (b2) cationic monoethylenically unsaturated monomers and if appropriate (b3) anionic monoethylenically unsaturated monomers, the fraction of the interpolymerized cationic monomers being greater than that of the anionic monomers, as a stabilizer, said aqueous dispersions are prepared by free radical polymerization of the anionic monomers in an aqueous medium in the presence of the abovementioned water-soluble polymers (a) and (b) and said aqueous dispersions are used as thickeners for aqueous systems.
Abstract:
The invention relates to aqueous dispersions of water-soluble polymers of N-vinyl-carboxamides, which are substantially salt-free and comprise anionic polymeric stabilizers having a comb-like molecular structure, processes for the preparation of the dispersions in the presence of anionic polymeric stabilizers having a comb-like molecular structure and the use of the dispersions as retention aids or fixing agents in papermaking.