Hyperbranched polymers a rheology modifier for water based paints

Hyperbranched copolymers of ethyl acrylate (EA) and tri methylol propane triacrylate (TMPTA) with different degree of polymerizations (DP-5, 8, 10, and 50) were prepared by convergent approach. Initially EA macroinitiator was prepared by Atom Transfer Radical Polymerization (ATRP) using N, N, N’, N”, N” pentamethyldiethyenetriamine (PMDETA) as a ligand, ethyl 2-bromoisobutyrate as an initiator and cuprous bromide (CuBr) as a catalyst, followed by subsequent copolymerization with trimethylol propane triacrylate (TMPTA). These hyperbranched copolymers were comprehensively characterized by Nuclear Magnetic Resonance Spectroscopy (1HNMR), Fourier Transfer Infra Red Spectroscopy (FTIR), Differential scanning calorimeter spectroscopy (DSC), RT- 10 Rheometer and Size Exclusion chromatography. These hyperbranched polymers were successfully used as rheological modifier in water based paints. The concentration of hyperbranched polymers used was 1 wt % in paint formulation and dramatic decrease in viscosity of paint were observed

Author(s): Yogesh T. Chimankar, Yogesh S. Ahire and Ramanand N. Jagtap

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