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Rosin resin for road marking paint made from gum rosin, high molecular polymer,unsaturated dibasic acid and polyalcohol by condensation and esterification, then heat—stabilizer and light-stabilizer are added in. They are irregular hemisphere particals．Which have good resistance to crushing, resistance to crocking, abrasion resistance, appropriate levelling and fast drying. They also have good resistance to yellowing and ageing resistance.