Process for the preparation of foams characterized by isocyanurate and urethane linkages
AssigneeBASF Wyandotte Corporation
InventorThirumurti Narayan
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Abstract
Foams characterized by isocyanurate and urethane linkages are prepared by condensing: (a) an organic polyisocyanate with a polyol or (b) a quasi-prepolymer in the presence of a blowing agent and a catalytically effective amount of an alkali metal salt of an organic phosphinic acid. The catalysts of the invention offer the advantages of longer cream times and fully cured foams in acceptable times, thus, finding particular utility in pour-in-place and slab stock foaming applications.
Claims9
A process for preparation of foams characterized by isocyanurate and urethane linkages comprising condensing (a) an organic polyisocyanate with a polyol or (b) an isocyanate-terminated quasi-prepolymer in the presence of a blowing agent and a catalytically effective amount of an alkali metal salt of an organic phosphinic acid.
Dependencies are inferred from the claim text.