| CPC C08F 293/005 (2013.01) [C08F 2/10 (2013.01); C08F 2/38 (2013.01); C08F 20/18 (2013.01); C08F 2438/03 (2013.01)] | 7 Claims |
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1. A RAFT polymerization reaction solution production method comprising:
a step 1 of mixing a RAFT agent having an acid group, which is represented by Formula (1), water, and a water-soluble inorganic base with each other to form a salt of at least a part of the acid group included in the RAFT agent and a cation derived from the water-soluble inorganic base and to obtain a RAFT agent aqueous solution in which the RAFT agent is dissolved in water;
a step 2 of adding a water-soluble polymerization initiator and an ethylenically unsaturated monomer to the RAFT agent aqueous solution and stirring the mixture to perform RAFT polymerization of the ethylenically unsaturated monomer dispersed in water and to obtain a RAFT polymerization reaction solution (A) in which a polymer-type RAFT agent represented by Formula (2) is dispersed in water,
 in Formula (1), R1 represents an organic group, the organic group has one or more acid groups selected from —CO2H, —SO3H, and —PO4H, Z represents an organic group selected from an alkyl group, an aryl group, an arylalkyl group, an alkylthio group, an arylthio group, and an arylalkylthio group, and a part of the organic group represented by Z may be substituted,
 in Formula (2), R1 represents an organic group, the organic group has one or more acid groups selected from —CO2H, —SO3H, and —PO4H, the acid group forms a salt, Z represents an organic group selected from an alkyl group, an aryl group, an arylalkyl group, an alkylthio group, an arylthio group, and an arylalkylthio group, a part of the organic group represented by Z may be substituted, X represents a repeating unit of any ethylenically unsaturated monomer, n represents an integer of 1 to 1,000, and in a case where n is 2 or more, a plurality of X's may be the same or different from each other; and
a step 3 of adding an ethylenically unsaturated monomer to the RAFT polymerization reaction solution (A) obtained in the step 2 and stirring the mixture to perform RAFT polymerization of the ethylenically unsaturated monomer dispersed in water and to obtain a RAFT polymerization reaction solution (B) in which a hydrophilic copolymer-type RAFT agent represented by Formula (3) is dispersed in water,
 in Formula (3), R1 represents an organic group, the organic group has one or more acid groups selected from —CO2H, —SO3H, and —PO4H, the acid group forms a salt, Z represents an organic group selected from an alkyl group, an aryl group, an arylalkyl group, an alkylthio group, an arylthio group, and an arylalkylthio group, a part of the organic group represented by Z may be substituted, X represents a repeating unit of any ethylenically unsaturated monomer, n represents an integer of 1 to 100, in a case where n is 2 or more, a plurality of X's may be the same or different from each other, Y represents a repeating unit of any ethylenically unsaturated monomer, m represents an integer of 10 to 10,000, a plurality of Y's may be the same or different from each other, and a polymer chain represented by (X)n is different from a polymer chain represented by (Y)m,
wherein, in a reaction solution after adding the ethylenically unsaturated monomer and the water-soluble polymerization initiator to the RAFT agent aqueous solution and immediately before starting polymerization in the step 2, a molar ratio represented by (M4+M5)/(M1+M2) is 1.0 to 10, in which a number of moles of an acid group included in the RAFT agent is indicated as M1, a number of moles of an acid group which may be included in the water-soluble polymerization initiator is indicated as M2, a number of moles of the water-soluble inorganic base added in the step 1 is indicated as M4, and a number of moles of a water-soluble inorganic base which may be added in the step 2 is indicated as M5.
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