| 摘要 |
<p>A process for preparing epoxy resin/phosphoric acid reaction products wherein a polyol polyether epoxide is reacted with a phosphoric acid source material and water in a reaction medium. The reaction product may optionally be salified with a base and diluted with water. The process is characterized by (1) employing as the acid source material one derivable by the reaction of a hydroxylic (P-OH)-blocking agent with (a) P4O10, (b) a reaction product of P4O10 with less than six molecular proportions of water or (c) an adduct of (b) with some of the oxirane groups in the epoxide, (2) employing as the reaction medium a hydrophilic solvent for the epoxide which is acceptable as a component of a coating composition, (3) phosphorylating the epoxide by reacting P-OH groups in the acid source material, effectively in the absence of free water molecules, with oxirane groupes in the epoxide until the content in the reaction mixture of species indistinguishable from H3PO4 by titration drops to a preselected level and then (4) subjecting the resultant reaction product to hydrolysis until the content in the reaction mixture of oxirane-derived phosphomonoester groups rises to at least a preselected value. These reaction products are useful in coating compositions.</p> |
