Aqueous polymer dispersions
AssigneeAllied Colloids Limited
InventorsPeter Flesher, David Farrar
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Abstract
A water miscible, stable, fluid product comprises particles above 20 microns in size of a high molecular weight polymer gel interconnected by a continuous phase that is an aqueous solution of an equilibrating agent that holds the water content of the particles in equilibrium with the water content of the aqueous phase and that prevents substantial agglomeration of the particles in the fluid product. Preferred equilibrating agents are sodium polyacrylate and poly-diallyl dimethyl ammonium chloride.
Claims15
A water miscible, stable, fluid product comprising aqueous gel particles of a high molecular weight water soluble polymer, said gel particles interconnected by a continuous liquid phase characterised in that the particles have a size of at least 20 microns and the continuous liquid phase is an aqueous solution of an equilibrating agent that holds the water content of the particles in the fluid product in equilibrium with the water content of the aqueous phase and that prevents substantial agglomeration of the particles in the fluid product and in which the gel polymer and equilibrating agent are selected from the combinations of gel polymer and equilibrating agent consisting of:
- (a) the gel polymer is an anionic polymer and the equilibrating agent is selected from the group consisting of water soluble anionic polymers of ethylenically unsaturated monomers, blends of water soluble cationic polymers of ethylenically unsaturated monomers with inorganic salts, and polydiallyldimethyl ammonium chloride;
- (b) the gel polymer is a cationic polymer and the equilibrating agent is selected from the group consisting of water soluble cationic polymers of ethylenically unsaturated monomers, polyethylene imine, dimethylamine-epichlorhydrin reaction product, and blends of water soluble anionic polymers of ethylenically unsaturated monomers with inorganic salts;
- (c) the gel polymer is a non-ionic polymer and the equilibrating agent is selected from the group consisting of water soluble anionic polymers of ethylenically unsaturated monomers and water soluble cationic polymers of ethylenically unsaturated monomers;
- and (d) the gel polymer is a cellulosic or starch polymer and the equilibrating agent is a water soluble anionic polymer of ethylenically unsaturated monomers;
- said fluid product made by dispersing into the aqueous solution particles of the polymer selected from the group consisting of aqueous gel polymer particles having the size of at least about 20 microns and dry particles that will absorb water from the aqueous solution to form aqueous gel particles having a size of at least 20 microns.
A water miscible, stable, fluid product comprising aqueous gel particles of a high molecular weight water soluble ionic polymer, said particles interconnected by a continuous liquid phase, said gel particles having a size of at least 20 microns and the continuous liquid phase being an aqueous solution of an equilibrating agent that holds the water content of the particles in the fluid product in equilibrium with the water content of the aqueous phase and that prevents substantial agglomeration of the particles in the fluid product, said equilibrating agent comprising a dissolved ionic polymer in an amount of at least 0.5 parts per part by weight of the high molecular weight polymer and comprising also an inorganic salt when the dissolved ionic polymer is counterionic to the gel polymer, said fluid product made by dispersing into the aqueous solution particles of the polymer selected from the group consisting of aqueous gel polymer particles having the size of at least about 20 microns and dry polymer particles that will absorb water from the aqueous solution to form said aqueous gel particles having a size of at least 20 microns.
Dependencies are inferred from the claim text.