C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
400/7929
C08K 3/32 (2006.01) C09D 3/58 (1980.01)
Patent
CA 1167188
ABSTRACT OF THE DISCLOSURE The invention is an improved process for preparing epoxy resin/phosphoric acid reaction products having high enough phosphomonoester contents to be water- -dispersible (as base salts) and low enough free acid contents to yield water-resistant cured coatings. The phosphoric acid is provided as an acid source material derivable by the reaction of a hydroxylic P-OH functionality-limiting agent (blocking agent) with phosphoric anhydride as such or as a reaction product thereof with less than six molecular proportions of water. A resin solvent, which may also function as the P-OH blocking agent but otherwise is inert and accept- able as part of the final coating resin formulation, is employed as the reaction medium. The epoxide/acid reaction is allowed to proceed, effectively in the absence of water, until the content in the reaction mixture of species indistinguishable from H3PO4 by base-titration has dropped to a minimum. Then enough water to hydrolyze the phosphopolyesters present is added and the hydrolysis is carried out, thereby cleav- ing the ester groups formed from the blocking agent and generating the P-OH groups needed for salification. 29,160A-F
405830
Campbell Kent D.
Langer Horst G.
Martin Patrick H.
Smart & Biggar
The Dow Chemical Company
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