PROCESS FOR PREPARING EMULSION FOR WATE- BASED INK COMPRISING HYDROPHILIC POLYMER AND HYDROPHOBIC POLYMER

摘要

PURPOSE: A process for preparing emulsion for water-based ink is provided to alter particle size suitable for controlling physical property of ink with no further alteration of pH and aging process to lead the reduction of reaction time while not changing composition, acid value, glass transition temperature of the final polymer product. CONSTITUTION: The process comprises a step of polymerizing hydrophilic polymer and controlling pH value to an alkali range of 8-9 and another step of polymerizing hydrophobic polymer to make both of the hydrophilic and the hydrophobic polymers to exist within the final emulsion polymer adhesive simultaneously. The hydrophilic polymer is formed by reacting 100 weight parts of a monomer mixture composed of 5-16 parts of methacrylic acid, 5-16 parts of acrylic acid, 61-85 parts of ethyl acrylate, 1-3 parts of acrylonitrile and 1-3 parts of anionic emulsifier; and 0.1-4.0 weight parts of molecular weight controlling agent at 60-90 deg.C. The hydrophobic polymer is formed by reacting 70-90 weight of styrene, 6-29 weight of methyl methacrylate and 1-4 weight of non-ionic emulsifier at 60-90 deg.C.