The solvent of the formula (5) includes glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol and dipropylene glycol and glycol ethers such as ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monobutyl ether, diethylene glycol monoethyl ether, diethylene glycol diethyl ether, diethylene glycol monobutyl ether, diethylene glycol