Starch is main surface sizing agent. Sizing agent comprised of dispersed natural polymers in an aqueous solution are provided, as well as methods for making these sizing agents and methods for using these sizing agents to size paper. Starch is main surface sizing agent (SSA) of natural polymers. Sago starch was prepared at different ratio of starch with deionized water. The characteristics and properties of the uncoated pineapple paper and SSA coated paper were reported. Different composition of starch ratio not much affected on melting point of sago starch, the melting point is around 90oC. Result showed that, surface sizing agent has pronounced effects in improving strength and water resistance. Increase the ratios of starch were decreased the strength and water resistance. The 1:10 starch ratio only absorbed 0.23g of water for 6 days while 1:25 starch ratio absorbed 0.34g of water for 6 days. Meanwhile, the strength properties were decreased as the starch ratio increases. The 1:10 starch ratio gives highest tear strength (80N) while 1:25 starch ratio (60N) and uncoated pineapple paper only 55N. In conclusion, the 1:10 starch ratio was showed better tear strength and water resistance for pineapple paper.
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