Provided is a method of preparing a graft polymer, which includes: polymerizing a monomer mixture comprising a carboxylic acid monomer and methyl acrylate, wherein the carboxylic acid monomer is included at 1.5 to 2.5 wt %, and thus preparing an acrylic coagulant having an average particle diameter of 60 to 70 nm; polymerizing diene-based monomers in the presence of an emulsifier containing a salt of a compound and thus preparing a first diene-based rubber polymer; enlarging the first diene-based rubber polymer using the acrylic coagulant and thus preparing a second diene-based rubber polymer; and graft-polymerizing an aromatic vinyl-based monomer and a vinyl cyanide-based monomer to the second diene-based rubber polymer and thus preparing a graft polymer.

A method for producing an aqueous dispersion of hollow polymer particles including: a core formation step wherein core polymer particles are formed by copolymerizing a monomer mixture; a first shell layer formation step wherein first shell layers that cover the particles are formed by copolymerizing a monomer mixture in the presence of the particles; a core swelling step wherein the particles are swelled by adding a base into an aqueous dispersion containing the particles, which have been provided with the first shell layers, and setting the pH of the aqueous dispersion to 7 or more; a polymerization stopping step wherein the polymerization is stopped after the core swelling step; and a shell swelling step wherein the first shell layers are swelled by adding a monomer mixture into the aqueous dispersion containing the particles, which have been provided with the first shell layers and swelled, after the polymerization stopping step.

A method for producing an aqueous dispersion of hollow polymer particles including: a core formation step wherein core polymer particles are formed by copolymerizing a monomer mixture; a first shell layer formation step wherein first shell layers that cover the particles are formed by copolymerizing a monomer mixture in the presence of the particles; a core swelling step wherein the particles are swelled by adding a base into an aqueous dispersion containing the particles, which have been provided with the first shell layers, and setting the pH of the aqueous dispersion to 7 or more; a polymerization stopping step wherein the polymerization is stopped after the core swelling step; and a shell swelling step wherein the first shell layers are swelled by adding a monomer mixture into the aqueous dispersion containing the particles, which have been provided with the first shell layers and swelled, after the polymerization stopping step.

A process for improving a latex comprising the steps of (a) providing a latex comprising a polymer binder, wherein said polymer binder is formed by polymerization of a monomer mixture comprising one or more ethylenically unsaturated carboxylic acid functional monomer, and (b) passing said latex comprising said polymer binder over a cation exchange resin.

A process for improving a latex comprising the steps of (a) providing a latex comprising a polymer binder, wherein said polymer binder is formed by polymerization of a monomer mixture comprising one or more ethylenically unsaturated carboxylic acid functional monomer, and (b) passing said latex comprising said polymer binder over a cation exchange resin.

Disclosed are a method of preparing a resin powder and an integrated reactor for the same. When a coagulation process is performed using an acidic coagulant in the integrated coagulator for latex coagulation and aging according to the present invention, a remaining acidic coagulant is also removed from a reactor through neutralization, and thus, a resin powder having enhanced moist-heat resistance and thermal stability may be prepared.

Disclosed are a method of preparing a resin powder and an integrated reactor for the same. When a coagulation process is performed using an acidic coagulant in the integrated coagulator for latex coagulation and aging according to the present invention, a remaining acidic coagulant is also removed from a reactor through neutralization, and thus, a resin powder having enhanced moist-heat resistance and thermal stability may be prepared.

A process for agglomerating superabsorbent particles, wherein polymer particles having a particle size of 250 m or less are dispersed in a hydrophobic organic solvent, the dispersed polymer particles are mixed with an aqueous monomer solution, the total amount of water applied to the dispersed polymer particles being at least 100% by weight, based on the dispersed polymer particles, and the monomer solution is polymerized.

A process for agglomerating superabsorbent particles, wherein polymer particles having a particle size of 250 m or less are dispersed in a hydrophobic organic solvent, the dispersed polymer particles are mixed with an aqueous monomer solution, the total amount of water applied to the dispersed polymer particles being at least 100% by weight, based on the dispersed polymer particles, and the monomer solution is polymerized.

A process for agglomerating superabsorbent particles, wherein polymer particles having a particle size of 250 m or less are dispersed in a hydrophobic organic solvent, the dispersed polymer particles are mixed with an aqueous monomer solution, the total amount of water applied to the dispersed polymer particles being at least 100% by weight, based on the dispersed polymer particles, and the monomer solution is polymerized.