| 摘要 |
PROBLEM TO BE SOLVED: To provide a surfactant composition for emulsion polymerization which can imparts a vinyl-based polymer emulsion excellent in polymerization stability, mechanical stability and chemical stability. SOLUTION: This surfactant composition for emulsion polymerization comprises (I) a compound having a critical micelle concentration(CMC) of 0.007 molL-1 to 0.1 molL-1 and represented by the formula R1O-(A1O)p-SO3M1, (II) a compound having a CMC not smaller than 1×10-5 moll-1 and smaller than 0.007 molL-1 and represented by the formula R2O-(A1O)q-SO3M2 and (III) a compound represented by the formula R3CH2O-(A3O)r-H in a specific content ratio wherein R1 and R2 are each a monovalent aliphatic hydrocarbon group, A1 and A2 are each a 2-4C alkylene group, p and q are each a number of 1 to 50, M1 and M2 are each a monovalent cation, R3 is a 9-13C alkyl group, A3 is a 2-4C alkylene group, r is a number of 15 to 60, and >=80% of r×A3 is ethylene group.
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