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It Is a kind of effective cationic styrene acrylic emulsion that is co-polymerized by styrene,acrylate&kinds of polymers via a special production process. It can be effectively matched with starch and let the starch layer perform better in cross-linking strength and hydrophobicity. With less dosage, lower cost, better surface sizing effect, It is widely used in the production of corrugated paper, paperboard, whiteboard paper, craft paper and etc.