| 摘要 |
The present invention provides an aqueous resin dispersion having a relatively low acid value and high viscosity and structural viscosity after alkali neutralization, and a method for producing the same. An aqueous resin dispersion obtained by preparing an aqueous solution resin (A) for emulsion polymerization having an acid value of 30 to 150 and a hydroxyl group value of 10 to 100 by solution-polymerizing an acid group-containing polymerizable unsaturated monomer (a), a hydroxyl group-containing polymerizable unsaturated monomer (b), and any other polymerizable unsaturated monomer (c) in organic solvent to produce an organic solvent solution of a copolymer, converting the organic solvent solution into an aqueous solution, and removing the organic solvent under-reduced pressure; and synthesizing a resin (B) having an acid value of not more than 20 and a hydroxyl group value of not more than 100 in a protective colloid by using the aqueous solution resin (A) for emulsion polymerization prepared in step (1) as said protective colloid and by emilsion-polymerizing the monomer (c), and optionally the monomer (b), and optionally the monomer (a). The resin (A) for emulsion polymerization may be obtained by aqueous-solution-polymerizing the monomer (a), the monomer (b) and the monomer (c) in water.
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