| 摘要 |
<p>New and improved storage stable, one package, heat-curable poly urea/urethane coating compositions are disclosed which comprise:
<UnorderedLists id="ula01" listStyle="none"><ListItem>(a) a mixture or prepolymer of
<UnorderedLists id="ula02" listStyle="none"><ListItem>(i) a poly aliphatic isocyanate compound of the formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="20" wi="36" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>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</ListItem><ListItem>(ii) an approximately stoichiometric amount of at least one monomeric or polymeric compound containing a plurality of isocyanate reactive hydrogens; and</ListItem><ListItem>(b) a minor effective amount of a polymerization calalyst.</ListItem></UnorderedLists></ListItem></UnorderedLists></p><p>The compositions cure when heated to above about 100°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><p>In a preferred embodiment the new and improved poly urea/urethane coating compositions comprises a prepolymer solution containing a prepolymer derived from a,a,a',a'-tetramethylxylyene diisocyanate and 9-amino-10-hydroxystearylamine having a solids content of from about 30% by weight to about 80% by weight and an isocyanate content of from about 2% by weight to about 10% by weight, based on the total weight of the solution, and a minor effective amount of a dibutyltin dilaurate catalyst.</p> |
