| 摘要 |
<p>A process for producing a modified polyester foam having a density of 0.5 to 40 pounds per cubic foot comprising mixing on a weight basis a polyol composition A comprising unsaturated polyester resin dissolved in a copolymerizable monomer containing 30-80% non-volatile matter on a weight basis, at least one urethane reaction catalyst, at least one polyisocyanate trimerization catalyst, at least one organic compound functional as a peroxide decomposition catalyst, at least one low molecular weight polyol, and at least one silicone surface active agent, and an isocyanate composition B comprising a polyisocyanate, at least one organic peroxide functional as an unsaturated polyester resin curing catalyst, and urethane reaction co-catalyst, at least one of compositions A and B containing a blowing agent, and allowing said mixture to cream and foam as a result of the heat generated by the trimerization of the polyisocyanate and the urethane reaction between isocyanate groups and hydroxyl groups in the polyols and unsaturated polyester, said heat being sufficient to cause gas generation from the blowing agent and cross-linking of the unsaturated polyester with the copolymerizable monomer. The products of the invention are especially suitable as foam board useful in building insulation.</p> |
