Reaction products of polyepoxide and excess di-2-oxazoline

Abstract

This invention concerns linear, curable polymeric materials prepared by reaction of a polyepoxide with an excess of di-2-oxazoline, and to cured products produced therefrom which are particularly suited as self-adherent corrosion and chemical resistant coatings for metals.

What is claimed is: 
     
       1. A process for preparing cured products which are particularly suited as self-adherent corrosion and chemical resistant coatings for metals, comprising (A) preparing a curable, linear prepolymer by reaction at a temperature of between about 100° C. and 150° C. under autogenous pressure of (1) a polyepoxide having an average of more than one 1,2-epoxyaliphatic group per molecule with (2) at least 2 equivalents per equivalent of polyepoxide of a di-2-oxazoline of the formula ##SPC2##   wherein X represents ##EQU1## where each R represents hydrogen or alkyl having from 1 to 4 carbon atoms; X' represents ethyleneoxy or propyleneoxy; R' represents hydrogen or alkyl having from 1 to 3 carbon atoms; X" represents oxygen or sulfur; and R" represents alkylene of from 2 to 20 carbon atoms, arylene of from 6 to 10 carbon atoms, or arylalkylene of from 7 to 15 carbon atoms, and   (B) curing said prepolymer by heating said prepolymer in the presence of curing amounts of an aromatic diisocyanate.   
     
     
       2. The process of claim 1 wherein said polyepoxide is a diglycidyl ether of bisphenol A with epichlorohydrin having an epoxy equivalent weight of from about 186-192. 
     
     
       3. The process of claim 2 wherein said di-2-oxazoline is 2,2-thiodiethylene bis-2-oxazoline. 
     
     
       4. The process of claim 3 wherein said diisocyanate is toluene diisocyanate. 
     
     
       5. A cured product prepared by the process of claim 1.