Environmentally friendly, polyacrylic-based polyurethane dispersion (PUD) was synthesised using various molar ratios of polycaprolactone, dimethylolpropionic acid and tetramethyl xylene diisocyanate. Synthesis was carried out in flowing nitrogen atmosphere. The PUD’s preparations are free of NMP (n-methyl pyrrolidone), a toxic processing solvent generally used during the preparation of PUD’s. The performance of the synthesised polyurethane dispersions with varying NCO/OH molar ratio was tested on wood surface. The physical, chemical, thermal and mechanical properties such as viscosity, particle size, chemical resistance, thermal stability and taber abrasion of applied polyurethane dispersion were carried out as a function of NCO/OH molar ratio. The PUD’s preparation with NCO/OH ratio of 1.4 or 1.6 showed better performance as a wood finish and the results are described in the present study.
 O. Bayer, “Das Di-Isocyanat-Polyadditionsverfahren (Polyurethane),” Angewandte Chemie, Vol. 59, No. 9, 1947, pp. 257-272. http://dx.doi.org/10.1002/ange.19470590901
 K. L. Noble, “Waterborne polyurethanes,” Progress in Organic Coatings, Vol. 32, No. 1-4, 1997, pp. 131-136.
 M. Melchirs and M. Sonntag, “Recent Developments in Aqueous Two-Component Polyurethane (2K-PUR) Coatings,” Progress in Organic Coatings, Vol. 40, No. 1-4, 2000, pp. 99-109.
 S. Y. Lee, J. S. Lee and B. K. Kim, “Preparation and Properties of Water-Borne Polyurethanes,” Polymer International, Vol. 42, No. 1, 1997, pp. 67-76.
 M. M. Rahman and H. D. Kim, “Synthesis and Characterization of Waterborne Polyurethane Adhesives Containing Different Amount of Ionic Groups (I),” Journal of Applied Polymer Science, Vol. 102, No. 6, 2006, pp. 5684- 5691. http://dx.doi.org/10.1002/app.25052
 Y. S. Kwak, E. Kim, B. H. Yoo and H. D. Kim, “Preparation and Properties of Waterborne Poly(urethane urea)s for Adhesives: The Effects of the 2,2-Bis(Hydroxylmethyl)Propionic Acid Content on the Properties,” Journal of Applied Polymer Science, Vol. 94, No. 4, 2004, pp. 1743-1751.
 T. Jeevananda, M. Begum and Siddaramaiah, “Studies on Polyaniline Filled PU/PMA Interpenetrating Polymer Networks,” European Polymer Journal, Vol. 37, No. 6, 2001, pp. 1213-1218.
 J. E. Yang, J. S. Kong, S. W. Park, D. J. Lee and H. D. Kim, “Preparation and Properties of Waterborne Polyurethane-Urea Anionomers. I. The Influence of the Degree of Neutralization and Counterion,” Journal of Applied Polymer Science, Vol. 86, No. 9, 2002, pp. 2375-2383.
 D. C. Lee, R. A. Register, C. Z. Yang, S. L. Copper, “MDI-Based Polyurethane Ionomers. 2. Structure-Property Relationships,” Macromolecules, Vol. 21, No. 4, 1988, pp. 1005-1008.
 C. Hepnurn, “Polyurethane Elastomer,” 2nd Edition, Elsevier, New York, 1992.
 S. Subramani, Y. J. Park, I. W. Cheong and J. H. Kim, “Polyurethane Ionomer Dispersions from a Blocked Aromatic-Diisocyanate Prepolymer,” Polymer International, Vol. 53, No. 8, 2004, pp. 1145-1152.
 B. K. Kim and J. C. Lee, “Modification of Waterborne Polyurethanes by Acrylate Incorporations,” Journal of Applied Polymer Science, Vol. 58, No. 7, 1994, pp. 1117-1124.
 T. W. Pechar, G. L. Wilkes, B. Zhou and N. Luo, “Characterization of Soy-Based Polyurethane Networks Prepared with Different Diisocyanates and Their Blends with Petroleum-Based Polyols,” Journal of Applied Polymer Science, Vol. 106, No. 4, 2007, pp. 2350-2362.
 G. Ligadas, J. C. Ronda, M. Galia and V. Cadiz, “Poly (ether urethane) Networks from Renewable Resources as Candidate Biomaterials: Synthesis and Characterization,” Biomacromolecules, Vol. 8, No. 2, 2007, pp. 686-692.