| 摘要 |
PROBLEM TO BE SOLVED: To increase the average particle size and improve resin fixation by supplying little by little a monomer aq. soln. contg. a phosphate ester dispersant to a hydrophobic org. solvent contg. a nonionic dispersant, and kept under a polymn. condition. SOLUTION: As a monomer, usually a monovinyl monomer selected from the group consisting of (meth)acrylic acid, its salt, or (meth)acryl amide, or one consisting mainly thereof. This monomer soln. contains a phosphoric acid dispersant represented by the formula I, wherein R1 is a 8-30C alkyl group may be replaced with a phenyl group, or an aryl group may be replaced with an alkyl group, R2 is a hydroxyl group or a group represented by the formula II, and n is an integer of 1-30. During the suspension polymn., wherein the monomer aq. soln. is continuously supplied to a hydrophobic org. soln. kept under a refluxing condition, and it is pref. that the monomer soln. is supplied in not less than 20% of the time required for the total polymn.
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