| abstract |
In processes for producing flexible polyurethane foams having sag factors higher than 2.5, which processes include the step of reaction of a polyisocyanate with a polymeric polyol, the improvement of using as the polyisocyanate an undistilled primary diamine phosgenation product having an amine equivalent of from 87 to 168, and conducting the reaction in the presence of a catalyst, a blowing agent, and a chain extender consisting of a primary amine. |