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US 4,791,148 AGranted
Isocyanate terminated quasi-prepolymers useful for preparing polyurethane/polyisocyanurate foams having low thermal conductivity
AssigneeBASF SE
InventorsRobert E. Riley, Thirumurti Narayan
Life of this patent
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Abstract
Polyurethane/polyisocyanurate rigid foams having low thermal conductivity are prepared from isocyanate-terminated quasi-prepolymers prepared from polyester polyols derived from phthalic anhydride or from the transesterification of polyethylene terephthalate scrap.
Claims7
An isocyanate-group terminated quasi-prepolymer consisting of the reaction product of an organic polyisocyanate with a polyester polyol consisting of the reaction product of phthalic anhydride and a low molecular weight aliphatic polyhydric alcohol.
Dependencies are inferred from the claim text.