| 摘要 |
<p>New and improved storage stable, one package, heat curable polyurethane adhesive compositions are disclosed which comprise
<UnorderedLists id="ula01" listStyle="none"><ListItem>(a) a mixture of or a prepolymer adduct of:
<UnorderedLists id="ula02" listStyle="none"><ListItem>(i) an excess of a poly aliphatic isocyanate compound of the formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="21" wi="36" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry></ListItem></UnorderedLists>wherein R and R' are each, independently, alkyl or substituted alkyl and X is a bridging means selected from divalent aliphatic, cycloaliphatic or aromatic groups; and
<UnorderedLists id="ula03" listStyle="none"><ListItem>(ii) at least one monomeric or polymeric compound containing a plurality of hydroxyl groups; in admixture with</ListItem></UnorderedLists></ListItem><ListItem>(b) a stoichiometric amount of a curing agent comprising a monomeric or polymeric compound having at least three hydroxyl groups at least one of which is a secondary hydroxyl group; and</ListItem><ListItem>(c) optionally, an inert filler.</ListItem></UnorderedLists></p><p>The compositions are curable upon exposure to elevated temperatures of from about 100°-200°C to form high tensile strength, high adhesive strength bonds to a variety of substrates. The compositions have extended pot lives of up to six weeks and exhibit storage stability for up to six months.</p> |
