| 摘要 |
Disclosed is a method for preparing emulsion polymers suitable for use in water-borne inks. First, a hydrophilic monomer mixture comprising methacrylic acid, acrylic acid, ethyl acrylate, and acrylonitrile is polymerized to produce a hydrophilic polymer latex. Then, pH of the hydrophilic polymer latex is adjusted to 8 to 9 using ammonia water. Finally, a hydrophobic monomer mixture comprising styrene, methyl methacrylate and a non-ionic emulsifier is in-situ polymerized in the presence of the pH-controlled hydrophilic polymer latex. Therefore, the emulsion polymer particles in which both hydrophilic and hydrophobic polymers coexist are obtained. Without any change of physical properties such as composition, acid number, and glass transition temperature, the particle size of the final emulsion polymer can be controlled by varying the amount of the chain transfer agent. In addition, the whole reaction time is much reduced because additional pH control and aging processes are not required.
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