| 摘要 |
A flexible or semi-flexible polyurethane foam composition prepared from a formulation comprising a catalytic amount of an additive containing (1) a urea compound, and (2) a transition metal salt of a carboxylic acid wherein the metal is selected from Groups I-B, II-B, V-A, IV-B, V-B, VI-B, VII-B or VIII of the Periodic Table of the Elements; the additive containing a sufficient quantity of at least one amine group-containing material such that the transition metal salt is soluble in the additive; and water as a blowing agent. In preferred embodiments water is the sole blowing agent. The polyurethanes exhibit relatively short demolding times and improved mold release properties. They also show a reduced tendency to cause discoloration or staining of vinyl-based polymeric calddings such as polyvinyl chloride.
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