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An aqueous dispersion having good stability and fluidity, and a process for production thereof. The aqueous dispersion is produced by polymerizing (a) a specified amount of an ethylenically unsaturated monomer capable of forming a water-soluble polymer in (b) a specified amount of an aqueous solutio

An aqueous dispersion having good stability and fluidity, and a process for production thereof. The aqueous dispersion is produced by polymerizing (a) a specified amount of an ethylenically unsaturated monomer capable of forming a water-soluble polymer in (b) a specified amount of an aqueous solution containing a water-soluble polymer while adjusting the weight ratio of (a) to (b) to from 1:5 to 5:1.

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1. A process for producing an aqueous dispersion, having good stability and fluidity, of water-soluble polymers, which comprises polymerizing or copolymerizing (a) the monomer components of a composition containing at least one water-soluble ethylenically unsaturated monomer, all of said monomer com

1. A process for producing an aqueous dispersion, having good stability and fluidity, of water-soluble polymers, which comprises polymerizing or copolymerizing (a) the monomer components of a composition containing at least one water-soluble ethylenically unsaturated monomer, all of said monomer components in said composition being capable of being polymerized or copolymerized with each other to form only a water-soluble polymer or copolymer, said polymerization being carried out in an aqueous solution of (b) at least one water-soluble polymer which is different from the polymer derived from said monomer components (a), said aqueous solution containing 3 to 150 parts by weight of said water-soluble polymer (b) per 100 parts by weight of water, the amount of said monomer components (a) being 10 to 150 parts by weight per 100 parts by weight of said water, the weight ratio of (a):(b) being within the range of from 1:5 to 5:1, said aqueous dispersion of water-soluble polymers being (i) a dispersion in water of a loose water-containing complex composed of said polymer or copolymer derived from said monomer components (a) and said water-soluble polymer (b), or (ii) a dispersion of said polymer or copolymer derived from said monomer components (a) in said aqueous solution of said water-soluble polymer (b). 2. The process of claim 1 wherein the monomer components (a) consists of at least one water-soluble ethylenically unsaturated monomer capable of forming a water-soluble polymer. 3. The process of claim 1 wherein said monomer components (a) is a mixture of at least one water-soluble ethylenically unsaturated monomer capable of forming a water-soluble polymer, and a comonomer which by itself is incapable of forming a water-soluble polymer but which can be copolymerized with said water-soluble ethylenically unsaturated monomer in an amount which is capable of forming a water-soluble polymer. 4. The process of claim 1 wherein a water-soluble inorganic salt is present during the polymerization or copolymerization in an amount in which it is soluble in the water, or is added in said amount to the dispersion obtained by the polymerization or copolymerization. 5. The process of claim 1 wherein said aqueous solution contains 5 to 125 parts by weight of the water-soluble polymer (b) per 100 parts by weight of water. 6. The process of claim 5 wherein said aqueous solution contains 10 to 100 parts by weight of the water-soluble polymer (b) per 100 parts by weight of water. 7. The process of claim 1 wherein the amount of said monomer components (a) is 10 to 100 parts by weight per 100 parts by weight of water. 8. The process of claim 1 wherein the weight ratio of said monomer components (a) to said water-soluble polymer (b) is within the range of from 1:2.5 to 2.5:1. 9. The process of claim 1 wherein said ethylenically unsaturated monomer is a compound containing an acroyl group. 10. The process of claim 1 wherein said ethylenically unsaturated monomer is selected from compounds of the following formulae: ##STR## wherein R 1 represents hydrogen or methyl, and R 2 and R 3, independently from each other, represent hydrogen, alkyl containing 1 to 5 carbon atoms, or hydroxyalkyl containing 1 to 5 carbon atoms; ##STR## wherein R represents hydrogen, methyl or halogen, and X represents hydrogen, an alkali metal or the group --NH 4, and; ##STR## wherein R 1 represents hydrogen or methyl, and Y represents a group of the formula ##STR## or a group of the formula ##STR## in which R 4 and R 7 represent alkylene containing 2 to 5 carbon atoms or hydroxyalkylene containing 2 to 5 carbon atoms, R 5, R 6, R 8 and R 9 represent alkyl containing 1 to 5 carbon atoms, R 10 represents alkyl containing 1 to 5 carbon atoms, benzyl or the group --CH 2 COOH, and Z represents halogen, SO 3 OCH 3, 1/2 SO 4, CH 3 SO 3 or CH 3 COO. 11. The process of claim 1 wherein said ethylenically unsaturated monomer is selected from the group consisting of acrylamide, N-methylacrylamide N,N-dimethylacrylamide, N-hydroxyethyl acrylamide, acrylic acid, alkali metal acrylates, methacrylic acid, alkali metal methacrylates, alpha-chloroacrylic acid, dimethylaminoethyl methacrylate, diethylaminoethyl acrylate, beta-methacroyloxyethyl trimethyl ammonium chloride, and beta-methacroyloxyethyl trimethyl ammonium sulfate. 12. The process of claim 1 wherein said water-soluble polymer (b) is selected from water-soluble polymers having a molecular weight of 300 to 10,000,000 and containing in the structural units of the polymer at least one functional group selected from the group consisting of ether, hydroxyl, carboxyl, sulfone, sulfate ester, amino, imino, tertiary amino, quaternary ammonium and hydrazino groups. 13. The process of claim 1 wherein the component used as the water-soluble polymer (b) contains a water-soluble polymer having in its structural units at least one functional group selected from the group consisting of ether, hydroxyl and carboxyl groups. 14. The process of claim 13 wherein the component used as the water-soluble polymer (b) contains at least 10% by weight of a water-soluble polymer containing in its structural units at least one functional group selected from the group consisting of ether, hydroxyl and carboxyl groups. 15. The process of claim 1 wherein said water-soluble polymer (b) is selected from the group consisting of polyethylene glycol, polyethylene oxide, polyvinyl alcohol, a copolymer of ethylene glycol and propylene glycol, polypropylene glycol, polyethyleneimine, polyvinyl pyrrolidone, polyvinyl pyridine, and soluble starch. 16. The process of claim 1 wherein the polymerization or copolymerization is carried out in the presence of a radical initiator at a temperature of 10° to 100° C. until the conversion of the monomer components reaches at least 90%. 17. The process of claim 1 wherein, an organic solvent soluble in water but incapable of dissolving the resulting polymer composition is added to the dispersion after the polymerization or compolymerization in an amount in which it is soluble in the water.