Manufacturing method of coumarone-indene resin water-dispersed composition and water-dispersed composition

A method for manufacturing a coumarone-indene resin water-dispersed composition, the method comprising:

• a process of dispersing a coumarone-indene resin which contains 50% by weight or more of coumarone and indene in total as monomer constituents and has a softening point of 60° C. or more, in the presence of a surfactant by a wet milling and dispersing method,
• wherein a surfactant (a) which is represented by Formula (I) and a surfactant (b) which is represented by Formula (II) are used as the surfactant:
• Surfactant (a):
• R1—O-(A1O)p—X (I)
• Surfactant (b):
• R2—O-(A2O)q—H (II)
• where in Formula (I), R1 represents one or more selected from a group consisting of an alkyl group having eight to twenty-two carbons, an alkenyl group having eight to twenty-two carbons, and an aromatic derivative residue represented by any of Formulae (III) to (V), A1O represents an oxyalkylene group having two to four carbons, p represents an average addition mole number of an alkylene oxide, which is a number from zero to thirty, and X represents an anionic group which is represented by any of Formulae (VI) to (VIII), wherein M in Formulae (VI) to (VIII) represents any one of a hydrogen atom, an alkali metal atom, ammonium, and an alkanolamine, and Formula (II), R2 represents one or more selected from a group consisting of an alkyl group having eight to fifteen carbons, an alkenyl group having eight to fifteen carbons, and aromatic derivative residue which is represented by any of Formulae (III) to (V), A2O represents an oxyalkylene group having two to four carbons, and q represents an average addition mole number of an alkylene oxide, which is a number from 0 to 200