Patent ID: 7098250

Claim:
A surfactant for emulsion polymerization, comprising at least one compound selected from the group consisting of unsaturated compounds having a pentenyl group to which an alkylene oxide is added and represented by the formula (I), (II) or (VI): wherein A represents a straight-chain or branched alkylene group having 3 to 18 carbon atoms or an alkoxymethylethylene group represented by the formula (III) or (IV): wherein R represents a straight-chain or branched alkyl group having 4 to 18 carbon atoms, EO represents an oxyethylene group, a denotes a number of 0 to 50, b denotes a number of 0 to 200, a and b are not 0 at the same time and M represents a cation, provided that the -(AO)— groups a in number and the -(EO)— groups b in number may be connected either in a block sequence or in a random sequence; in the case of the block sequence, the order of arrangement of the -(AO)— block and the -(EO)— block may be optional and the -(AO)— groups a in number may be the same as or different from one another wherein A′O represents butyleneoxide, E′O represents an oxyethylene group, m is a number meeting the formula (VIII): 4≦{(Carbon number of A′O−2.8)×m+2}≦14 (VIII) showing an average addition mol number of an oxyalkylene group and n denotes a number of 5 to 200 showing an average addition mol number of an oxyethylene group, provided that the -(A′O)— groups m in number [-(A′O)m-] may be the same as or different from one another.