The divergent synthesis of a series of polydisperse hyperbranched polyesters based upon pentaerythritol and 1

2

4 benzentricaboxylic anhydride

modified by glycidyl methacrylate and methacrylic anhydride is described

proceeding in a stepwise growth manner starting from an “initiator core”

building hyperbranched arms.These materials have about 8

12 or 16 methacrylate double bonds at the chain extremities on each molecule.Those starburst hyperbranched polyesters have three dimensional and sphere-like molecular architecture without any entanglement between molecular chains.Using a viscometric cup

the flow time of the modified methacrylate hyperbranched oilyesters was compared with epoxyacrylate-modified unsaturated polyester of linear type

and showed that the viscosities of hyperbranched polyesters are rather low.The glass transition temperatures of UV cured films increase with the degree of terminal functionality.Hyperbranched acrylated polyesters are promising for the development of coatings and adhesives in industrial applications.