Hyperbranched polyesters can be widely used in coatings, either as direct additives, curing agent or as coating substrate, have shown superior performance compared with conventional additives . Introduction of about 1% of hydroxyl-terminated hyperbranched polyester , PU physical and mechanical properties improved significantly. The tensile strength of polyester PU increased 18.2 times compared to PU without hyperbranched polyester; hyperbranched polyester with modified double bonds in the UV-curable coatings has outstanding performance. Such as coatings of flexible material, it shows excellent resistance to oxygen permeability, making oxygen permeability of the PET and PP increased by 2.3 times and 15 times, in addition, adhesion is good on the PET and PP packaging substrate , has broad application prospects. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from “Preparation and mechan ical properties of aliphatic polyurethane elastomers with hyperbranched structure” Zhang Jie, Hu Chunpu* ( School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China)