Hyperbranched Polyols
(Dendritic Polymer Polyols)

Properties and Applications

Hyperbranched polymer polyols (HBPP), also called dendritic polyols, are fully amorphous aliphatic polymers with a repetitively branched polymer backbone having a large number of primary hydroxyl groups. Their densely branched (tree-like) structure and and their high hydroxyl number results in some unique properties that are very different from linear or slightly branched polymers. For example, dendritic polyols have a higher solubility in polar solvents and a lower solution viscosity than linear polymers of comparable molecular weight and functionality. HBPPs also possess excellent melt flow and processing properties at relatively high molecular weight. These properties make them especially desirable for applications where low viscosity in combination with high functionality and high molecular weight is desired to enhance the performance. When used as cobinders and crosslinked with other resins, they provide improved scratch and mar resistance and improved hardness. 

Dendritic polyols are mainly used as performance additives in a number of products including flexible polyurethane foams (crosslinker for improved foam stability), high-solid alkyd paints (reactive diluent) and solvent-borne paints (water-dispersing additive for partial replacement of solvents with water).¹

Manufacturers & Distributors

¹Boltorn^™ Brochure, Advancing performance & comfort, Perstop AB 201202