SEMIFLEXIBLE AND FLEXIBLE POLYURETHANE FOAMS HAVING LOW FOGGING CHARACTERISTICS AND IMPROVED PHYSICAL PROPERTIES

摘要

Semiflexible and flexible polyurethane foams having significantly reduced fogging and improved physical properties such as tensile strength, useful in the transportation industry, are obtained from a polyurethane foam-forming reaction-mixture containing as a polyester polyol for the foam a polyester polyol substantially free of any ether components which comprising: ;(a) at least one polyfunctional carboxylic acid and/or carboxylic anhydride compound; ;(b) at least one linear polyhydric alcohol; and ;(c) at least one branched polyhydric alcohol wherein the reactants of the polyester polyol are selected such that they cannot combine to provide a cyclic ester comprising a 12 to 14 membered ring. Optionally, the polyester polyol can further contain (d) a branched polyol having a functionality of at least three.