| 摘要 |
<p>A composite comprises in sequential order (a) a first substrate, (b) a water-blown polyurethane foam, and (c) a second substrate. The PU foam comprises the reaction prod. of an aromatic polyisocyanate with a polyol component comprising (A) cpd. having at least two isocyanate reactive hydrogens with a MW of at least 150 and an average functionality of at least 2.5; (B) a blowing agent comprising water; and (C) a Li salt of a carboxylic acid having 2-24 substd. or unsubstd., branched or unbranched, aliphatic or cycloaliphatic, alkyl or alkenyl C atoms. Also claimed is the mfr. of a composite comprising foaming in place a PU foam into a cavity defined by a first substrate and a second substrate held apart in a spaced relationship.</p> |
