PU Dispersions - Effect of Glycol in Polyol Moiety on the Properties of PU Coatings

Abstract

Polyurethane dispersions are binary colloidal systems having PUR particles dispersed in aqueous phase, which can be classified into anionic, cationic, and non-ionic systems, In this paper, PUR ionomers prepared by anionic dispersions process, using toluene di-isocynate [TDI], polyester polyol, and trimelletic anhydride [TMA] as the potential ionic center with NMP as the co-solvent are discussed. A series of polyols based on various glycols have been prepared while keeping the composition of the reactants the same. It is found that the dispersion prepared by a polyol containing neopentyl glycol [NPG] gives better

<span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">results of a coated film with respect to gloss, scratch resistance, flexibility, and abrasion resistance.</span>