| 摘要 |
PROBLEM TO BE SOLVED: To provide an emulsification process of a high viscosity resin without using a solvent.SOLUTION: In one embodiment, a solvent-free emulsification process for producing a latex having an average particle size of 50 to 900 nm is provided that comprises: heating a high viscosity resin to 90°C or more; mixing the heated resin with a surfactant and a neutralization agent in an amount corresponding to an acid value of the resin in a reaction vessel provided with a mixing device in the absence of an organic solvent to form a mixture; adding water to the mixture under pressurization of ca. 10 to 1000 KPa to form an emulsion under agitation; and reducing pressure in the vessel to obtain a solvent-free emulsion containing resin particles. In another embodiment, the solvent-free emulsification process is provided that is identical to the solvent-free emulsification process in the above one embodiment except that the surfactant is present in an amount of ca. 1 to ca. 10 wt% relative to a dry resin.SELECTED DRAWING: None |
