| 摘要 |
<p>New and improved storage stable, one package, heat-curable polyurea/urethane coating compositions are disclosed which comprise: (a) a mixture or prepolymer of (i) a poly aliphatic isocyanate compound of the formula: <IMAGE> wherein R and R' are each, independently, hydrogen, alkyl or substituted alkyl and X is a bridging means selected from divalent aliphatic, cycloaliphatic, or aromatic groups, or a polymeric adduct of said aliphatic isocyanate compound possessing poly aliphatic isocyanate functionality; and (ii) an approximately stoichiometric amount of at least one monomeric or polymeric compound containing a plurality of isocyanate reactive hydrogens; and (b) a minor effective amount of a polymerization catalyst. The compositions cure when heated to above about 100 DEG C. to form coatings which exhibit good abrasion resistance, solvent resistance, weather resistance and good adhesion to a wide variety of substrates. The coating compositions are stable upon storage for several months and have useful coating lives in the presence of atmospheric moisture of up to several days.</p> |
