| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a water-soluble polymer from a water-soluble monomer using a mercaptan compound as a chain transfer agent, and to obtain the water-soluble polymer. SOLUTION: A polymer having sulfonate end groups and repeating units of the formula (1): (CHR<SP>1</SP>-CR<SP>2</SP>R<SP>3</SP>) (wherein R<SP>1</SP>is hydrogen atom or COOM<SP>1</SP>, R<SP>2</SP>is hydrogen atom or CH<SB>3</SB>, R<SP>3</SP>is COOM<SP>1</SP>, CH<SB>2</SB>COOM<SP>1</SP>or CONR<SP>4</SP>R<SP>5</SP>, M<SP>1</SP>is hydrogen atom or an alkali metal atom, and R<SP>4</SP>and R<SP>5</SP>may be the same or different and are each hydrogen atom or a 1-4C alkyl group) and a polymerization degree of about 3,500 or smaller is manufactured by polymerizing an ethylenic monomer of the formula (3): CHR<SP>1</SP>=CR<SP>2</SP>R<SP>3</SP>in the presence of a mercaptoalkane sulfonate of the formula (2): HS-R<SP>6</SP>-SO<SB>3</SB>M<SP>2</SP>(wherein R<SP>6</SP>is a linear or branched 2-6C alkylene group, and M<SP>2</SP>is an alkali metal atom or NH<SB>4</SB>). The method provides the water-soluble polymer having sulfonate end groups. COPYRIGHT: (C)2005,JPO&NCIPI
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